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6d7732575a
webm/mkvparser.cpp
matthewjheaney 6d7732575a added comment to fix VideoTrack::Seek 
Change-Id: I2a8b3e4ca92bdfd2d77c84ab970379d22a06e451
2011-01-14 18:17:16 -05:00

5693 lines
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// Copyright (c) 2010 The WebM project authors. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
#include "mkvparser.hpp"
#include <cassert>
#include <cstring>
#include <new>
#include <climits>
mkvparser::IMkvReader::~IMkvReader()
{
}
void mkvparser::GetVersion(int& major, int& minor, int& build, int& revision)
{
major = 1;
minor = 0;
build = 0;
revision = 10;
}
long long mkvparser::ReadUInt(IMkvReader* pReader, long long pos, long& len)
{
assert(pReader);
assert(pos >= 0);
int status;
#ifdef _DEBUG
long long total, available;
status = pReader->Length(&total, &available);
assert(status >= 0);
assert(total > 0);
assert(available <= total);
assert(pos < available);
assert((available - pos) >= 1); //assume here max u-int len is 8
#endif
unsigned char b;
status = pReader->Read(pos, 1, &b);
if (status < 0) //error
return status;
if (status > 0) //interpreted as "underflow"
return E_BUFFER_NOT_FULL;
if (b == 0) //we can't handle u-int values larger than 8 bytes
return E_FILE_FORMAT_INVALID;
unsigned char m = 0x80;
len = 1;
while (!(b & m))
{
m >>= 1;
++len;
}
#ifdef _DEBUG
assert((available - pos) >= len);
#endif
long long result = b & (~m);
++pos;
for (int i = 1; i < len; ++i)
{
status = pReader->Read(pos, 1, &b);
if (status < 0)
return status;
if (status > 0)
return E_BUFFER_NOT_FULL;
result <<= 8;
result |= b;
++pos;
}
return result;
}
long long mkvparser::GetUIntLength(
IMkvReader* pReader,
long long pos,
long& len)
{
assert(pReader);
assert(pos >= 0);
long long total, available;
int status = pReader->Length(&total, &available);
assert(status >= 0);
assert(total >= 0);
assert(available <= total);
if (pos >= available)
return pos; //too few bytes available
unsigned char b;
status = pReader->Read(pos, 1, &b);
if (status < 0)
return status;
assert(status == 0);
if (b == 0) //we can't handle u-int values larger than 8 bytes
return E_FILE_FORMAT_INVALID;
unsigned char m = 0x80;
len = 1;
while (!(b & m))
{
m >>= 1;
++len;
}
return 0; //success
}
long long mkvparser::SyncReadUInt(
IMkvReader* pReader,
long long pos,
long long stop,
long& len)
{
assert(pReader);
if (pos >= stop)
return E_FILE_FORMAT_INVALID;
unsigned char b;
long hr = pReader->Read(pos, 1, &b);
if (hr < 0)
return hr;
if (hr != 0L)
return E_BUFFER_NOT_FULL;
if (b == 0) //we can't handle u-int values larger than 8 bytes
return E_FILE_FORMAT_INVALID;
unsigned char m = 0x80;
len = 1;
while (!(b & m))
{
m >>= 1;
++len;
}
if ((pos + len) > stop)
return E_FILE_FORMAT_INVALID;
long long result = b & (~m);
++pos;
for (int i = 1; i < len; ++i)
{
hr = pReader->Read(pos, 1, &b);
if (hr < 0)
return hr;
if (hr != 0L)
return E_BUFFER_NOT_FULL;
result <<= 8;
result |= b;
++pos;
}
return result;
}
long long mkvparser::UnserializeUInt(
IMkvReader* pReader,
long long pos,
long long size)
{
assert(pReader);
assert(pos >= 0);
assert(size > 0);
assert(size <= 8);
long long result = 0;
for (long long i = 0; i < size; ++i)
{
unsigned char b;
const long hr = pReader->Read(pos, 1, &b);
if (hr < 0)
return hr;
result <<= 8;
result |= b;
++pos;
}
return result;
}
float mkvparser::Unserialize4Float(
IMkvReader* pReader,
long long pos)
{
assert(pReader);
assert(pos >= 0);
long long total, available;
long hr = pReader->Length(&total, &available);
assert(hr >= 0);
assert(available <= total);
assert((pos + 4) <= available);
float result;
unsigned char* const p = (unsigned char*)&result;
unsigned char* q = p + 4;
for (;;)
{
hr = pReader->Read(pos, 1, --q);
assert(hr == 0L);
if (q == p)
break;
++pos;
}
return result;
}
double mkvparser::Unserialize8Double(
IMkvReader* pReader,
long long pos)
{
assert(pReader);
assert(pos >= 0);
double result;
unsigned char* const p = (unsigned char*)&result;
unsigned char* q = p + 8;
for (;;)
{
const long hr = pReader->Read(pos, 1, --q);
assert(hr == 0L);
if (q == p)
break;
++pos;
}
return result;
}
signed char mkvparser::Unserialize1SInt(
IMkvReader* pReader,
long long pos)
{
assert(pReader);
assert(pos >= 0);
long long total, available;
long hr = pReader->Length(&total, &available);
assert(hr == 0);
assert(available <= total);
assert(pos < available);
signed char result;
hr = pReader->Read(pos, 1, (unsigned char*)&result);
assert(hr == 0);
return result;
}
short mkvparser::Unserialize2SInt(
IMkvReader* pReader,
long long pos)
{
assert(pReader);
assert(pos >= 0);
long long total, available;
long hr = pReader->Length(&total, &available);
assert(hr >= 0);
assert(available <= total);
assert((pos + 2) <= available);
short result;
unsigned char* const p = (unsigned char*)&result;
unsigned char* q = p + 2;
for (;;)
{
hr = pReader->Read(pos, 1, --q);
assert(hr == 0L);
if (q == p)
break;
++pos;
}
return result;
}
bool mkvparser::Match(
IMkvReader* pReader,
long long& pos,
unsigned long id_,
long long& val)
{
assert(pReader);
assert(pos >= 0);
long long total, available;
long hr = pReader->Length(&total, &available);
assert(hr >= 0);
assert(available <= total);
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0);
assert(len > 0);
assert(len <= 8);
assert((pos + len) <= available);
if ((unsigned long)id != id_)
return false;
pos += len; //consume id
const long long size = ReadUInt(pReader, pos, len);
assert(size >= 0);
assert(size <= 8);
assert(len > 0);
assert(len <= 8);
assert((pos + len) <= available);
pos += len; //consume length of size of payload
val = UnserializeUInt(pReader, pos, size);
assert(val >= 0);
pos += size; //consume size of payload
return true;
}
bool mkvparser::Match(
IMkvReader* pReader,
long long& pos,
unsigned long id_,
char*& val)
{
assert(pReader);
assert(pos >= 0);
long long total, available;
long hr = pReader->Length(&total, &available);
assert(hr >= 0);
assert(available <= total);
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0);
assert(len > 0);
assert(len <= 8);
assert((pos + len) <= available);
if ((unsigned long)id != id_)
return false;
pos += len; //consume id
const long long size_ = ReadUInt(pReader, pos, len);
assert(size_ >= 0);
assert(len > 0);
assert(len <= 8);
assert((pos + len) <= available);
pos += len; //consume length of size of payload
assert((pos + size_) <= available);
const size_t size = static_cast<size_t>(size_);
val = new char[size+1];
for (size_t i = 0; i < size; ++i)
{
char c;
hr = pReader->Read(pos + i, 1, (unsigned char*)&c);
assert(hr == 0L);
val[i] = c;
if (c == '\0')
break;
}
val[size] = '\0';
pos += size_; //consume size of payload
return true;
}
bool mkvparser::Match(
IMkvReader* pReader,
long long& pos,
unsigned long id_,
unsigned char*& buf,
size_t& buflen)
{
assert(pReader);
assert(pos >= 0);
long long total, available;
long hr = pReader->Length(&total, &available);
assert(hr >= 0);
assert(available <= total);
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0);
assert(len > 0);
assert(len <= 8);
assert((pos + len) <= available);
if ((unsigned long)id != id_)
return false;
pos += len; //consume id
const long long size_ = ReadUInt(pReader, pos, len);
assert(size_ >= 0);
assert(len > 0);
assert(len <= 8);
assert((pos + len) <= available);
pos += len; //consume length of size of payload
assert((pos + size_) <= available);
const long buflen_ = static_cast<long>(size_);
buf = new (std::nothrow) unsigned char[buflen_];
assert(buf); //TODO
hr = pReader->Read(pos, buflen_, buf);
assert(hr == 0L);
buflen = buflen_;
pos += size_; //consume size of payload
return true;
}
bool mkvparser::Match(
IMkvReader* pReader,
long long& pos,
unsigned long id_,
double& val)
{
assert(pReader);
assert(pos >= 0);
long long total, available;
long hr = pReader->Length(&total, &available);
assert(hr >= 0);
assert(available <= total);
long idlen;
const long long id = ReadUInt(pReader, pos, idlen);
assert(id >= 0); //TODO
if ((unsigned long)id != id_)
return false;
long sizelen;
const long long size = ReadUInt(pReader, pos + idlen, sizelen);
switch (size)
{
case 4:
case 8:
break;
default:
return false;
}
pos += idlen + sizelen; //consume id and size fields
assert((pos + size) <= available);
if (size == 4)
val = Unserialize4Float(pReader, pos);
else
{
assert(size == 8);
val = Unserialize8Double(pReader, pos);
}
pos += size; //consume size of payload
return true;
}
bool mkvparser::Match(
IMkvReader* pReader,
long long& pos,
unsigned long id_,
short& val)
{
assert(pReader);
assert(pos >= 0);
long long total, available;
long hr = pReader->Length(&total, &available);
assert(hr >= 0);
assert(available <= total);
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0);
assert((pos + len) <= available);
if ((unsigned long)id != id_)
return false;
pos += len; //consume id
const long long size = ReadUInt(pReader, pos, len);
assert(size <= 2);
assert((pos + len) <= available);
pos += len; //consume length of size of payload
assert((pos + size) <= available);
//TODO:
// Generalize this to work for any size signed int
if (size == 1)
val = Unserialize1SInt(pReader, pos);
else
val = Unserialize2SInt(pReader, pos);
pos += size; //consume size of payload
return true;
}
namespace mkvparser
{
EBMLHeader::EBMLHeader() :
m_docType(NULL)
{
Init();
}
EBMLHeader::~EBMLHeader()
{
delete[] m_docType;
}
void EBMLHeader::Init()
{
m_version = 1;
m_readVersion = 1;
m_maxIdLength = 4;
m_maxSizeLength = 8;
if (m_docType)
{
delete[] m_docType;
m_docType = NULL;
}
m_docTypeVersion = 1;
m_docTypeReadVersion = 1;
}
long long EBMLHeader::Parse(
IMkvReader* pReader,
long long& pos)
{
assert(pReader);
long long total, available;
long hr = pReader->Length(&total, &available);
if (hr < 0)
return hr;
pos = 0;
long long end = (1024 < available)? 1024: available;
for (;;)
{
unsigned char b = 0;
while (pos < end)
{
hr = pReader->Read(pos, 1, &b);
if (hr < 0)
return hr;
if (b == 0x1A)
break;
++pos;
}
if (b != 0x1A)
{
if ((pos >= 1024) ||
(available >= total) ||
((total - available) < 5))
return -1;
return available + 5; //5 = 4-byte ID + 1st byte of size
}
if ((total - pos) < 5)
return E_FILE_FORMAT_INVALID;
if ((available - pos) < 5)
return pos + 5; //try again later
long len;
const long long result = ReadUInt(pReader, pos, len);
if (result < 0) //error
return result;
if (result == 0x0A45DFA3) //ReadId masks-off length indicator bits
{
assert(len == 4);
pos += len;
break;
}
++pos; //throw away just the 0x1A byte, and try again
}
long len;
long long result = GetUIntLength(pReader, pos, len);
if (result < 0) //error
return result;
if (result > 0) //need more data
return result;
assert(len > 0);
assert(len <= 8);
if ((total - pos) < len)
return E_FILE_FORMAT_INVALID;
if ((available - pos) < len)
return pos + len; //try again later
result = ReadUInt(pReader, pos, len);
if (result < 0) //error
return result;
pos += len; //consume u-int
if ((total - pos) < result)
return E_FILE_FORMAT_INVALID;
if ((available - pos) < result)
return pos + result;
end = pos + result;
Init();
while (pos < end)
{
if (Match(pReader, pos, 0x0286, m_version))
;
else if (Match(pReader, pos, 0x02F7, m_readVersion))
;
else if (Match(pReader, pos, 0x02F2, m_maxIdLength))
;
else if (Match(pReader, pos, 0x02F3, m_maxSizeLength))
;
else if (Match(pReader, pos, 0x0282, m_docType))
;
else if (Match(pReader, pos, 0x0287, m_docTypeVersion))
;
else if (Match(pReader, pos, 0x0285, m_docTypeReadVersion))
;
else
{
result = ReadUInt(pReader, pos, len);
assert(result > 0);
assert(len > 0);
assert(len <= 8);
pos += len;
assert(pos < end);
result = ReadUInt(pReader, pos, len);
assert(result >= 0);
assert(len > 0);
assert(len <= 8);
pos += len + result;
assert(pos <= end);
}
}
assert(pos == end);
return 0;
}
Segment::Segment(
IMkvReader* pReader,
long long start,
long long size) :
m_pReader(pReader),
m_start(start),
m_size(size),
m_pos(start),
m_pInfo(NULL),
m_pTracks(NULL),
m_pCues(NULL),
m_clusters(NULL),
m_clusterCount(0),
m_clusterPreloadCount(0),
m_clusterSize(0)
{
}
Segment::~Segment()
{
const long count = m_clusterCount + m_clusterPreloadCount;
Cluster** i = m_clusters;
Cluster** j = m_clusters + count;
while (i != j)
{
Cluster* const p = *i++;
assert(p);
delete p;
}
delete[] m_clusters;
delete m_pTracks;
delete m_pInfo;
delete m_pCues;
}
long long Segment::CreateInstance(
IMkvReader* pReader,
long long pos,
Segment*& pSegment)
{
assert(pReader);
assert(pos >= 0);
pSegment = NULL;
long long total, available;
long hr = pReader->Length(&total, &available);
assert(hr >= 0);
assert(available <= total);
//I would assume that in practice this loop would execute
//exactly once, but we allow for other elements (e.g. Void)
//to immediately follow the EBML header. This is fine for
//the source filter case (since the entire file is available),
//but in the splitter case over a network we should probably
//just give up early. We could for example decide only to
//execute this loop a maximum of, say, 10 times.
while (pos < total)
{
//Read ID
long len;
long long result = GetUIntLength(pReader, pos, len);
if (result) //error, or too few available bytes
return result;
if ((pos + len) > total)
return E_FILE_FORMAT_INVALID;
if ((pos + len) > available)
return pos + len;
//TODO: if we liberalize the behavior of ReadUInt, we can
//probably eliminate having to use GetUIntLength here.
const long long id = ReadUInt(pReader, pos, len);
if (id < 0) //error
return id;
pos += len; //consume ID
//Read Size
result = GetUIntLength(pReader, pos, len);
if (result) //error, or too few available bytes
return result;
if ((pos + len) > total)
return E_FILE_FORMAT_INVALID;
if ((pos + len) > available)
return pos + len;
//TODO: if we liberalize the behavior of ReadUInt, we can
//probably eliminate having to use GetUIntLength here.
long long size = ReadUInt(pReader, pos, len);
if (size < 0)
return size;
pos += len; //consume length of size of element
//Pos now points to start of payload
if (id == 0x08538067) //Segment ID
{
//Handle "unknown size" for live streaming of webm files.
const long long unknown_size = (1LL << (7 * len)) - 1;
if (size == unknown_size)
size = total - pos;
else if ((pos + size) > total)
return E_FILE_FORMAT_INVALID;
pSegment = new (std::nothrow) Segment(pReader, pos, size);
if (pSegment == 0)
return -1; //generic error
return 0; //success
}
if ((pos + size) > total)
return E_FILE_FORMAT_INVALID;
pos += size; //consume payload
}
return E_FILE_FORMAT_INVALID; //there is no segment
}
long long Segment::ParseHeaders()
{
//Outermost (level 0) segment object has been constructed,
//and pos designates start of payload. We need to find the
//inner (level 1) elements.
long long total, available;
const int status = m_pReader->Length(&total, &available);
assert(status == 0);
assert(total >= 0);
assert(available <= total);
const long long stop = m_start + m_size;
assert(stop <= total);
assert(m_pos <= stop);
while (m_pos < stop)
{
long long pos = m_pos;
const long long element_start = pos;
if ((pos + 1) > available)
return (pos + 1);
long len;
long long result = GetUIntLength(m_pReader, pos, len);
if (result < 0) //error
return result;
if (result > 0) //underflow (weird)
return (pos + 1);
if ((pos + len) > stop)
return E_FILE_FORMAT_INVALID;
if ((pos + len) > available)
return pos + len;
const long long idpos = pos;
const long long id = ReadUInt(m_pReader, idpos, len);
if (id < 0) //error
return id;
if (id == 0x0F43B675) //Cluster ID
break;
pos += len; //consume ID
if ((pos + 1) > available)
return (pos + 1);
//Read Size
result = GetUIntLength(m_pReader, pos, len);
if (result < 0) //error
return result;
if (result > 0) //underflow (weird)
return (pos + 1);
if ((pos + len) > stop)
return E_FILE_FORMAT_INVALID;
if ((pos + len) > available)
return pos + len;
const long long size = ReadUInt(m_pReader, pos, len);
if (size < 0) //error
return size;
pos += len; //consume length of size of element
const long long element_size = size + pos - element_start;
//Pos now points to start of payload
if ((pos + size) > stop)
return E_FILE_FORMAT_INVALID;
//We read EBML elements either in total or nothing at all.
if ((pos + size) > available)
return pos + size;
if (id == 0x0549A966) //Segment Info ID
{
assert(m_pInfo == NULL);
m_pInfo = new SegmentInfo(this,
pos,
size,
element_start,
element_size);
assert(m_pInfo); //TODO
}
else if (id == 0x0654AE6B) //Tracks ID
{
assert(m_pTracks == NULL);
m_pTracks = new Tracks(this,
pos,
size,
element_start,
element_size);
assert(m_pTracks); //TODO
}
else if (id == 0x0C53BB6B) //Cues ID
{
if (m_pCues == NULL)
{
m_pCues = new Cues(this,
pos,
size,
element_start,
element_size);
assert(m_pCues); //TODO
}
}
else if (id == 0x014D9B74) //SeekHead ID
{
if (available >= total)
ParseSeekHead(pos, size);
}
m_pos = pos + size; //consume payload
}
assert(m_pos <= stop);
if (m_pInfo == NULL) //TODO: liberalize this behavior
return E_FILE_FORMAT_INVALID;
if (m_pTracks == NULL)
return E_FILE_FORMAT_INVALID;
return 0; //success
}
#if 0
long Segment::FindNextCluster(long long& pos, size& len) const
{
//Outermost (level 0) segment object has been constructed,
//and pos designates start of payload. We need to find the
//inner (level 1) elements.
long long total, available;
const int status = m_pReader->Length(&total, &available);
assert(status == 0);
assert(total >= 0);
assert(available <= total);
const long long stop = m_start + m_size;
assert(stop <= total);
assert(m_pos <= stop);
pos = m_pos;
while (pos < stop)
{
long long result = GetUIntLength(m_pReader, pos, len);
if (result < 0)
return static_cast<long>(result);
if (result > 0)
return E_BUFFER_NOT_FULL;
if ((pos + len) > stop)
return E_FILE_FORMAT_INVALID;
if ((pos + len) > available)
return E_BUFFER_NOT_FULL;
const long long idpos = pos;
const long long id = ReadUInt(m_pReader, idpos, len);
if (id < 0) //error
return static_cast<long>(id);
pos += len; //consume ID
//Read Size
result = GetUIntLength(m_pReader, pos, len);
if (result < 0) //error
return static_cast<long>(result);
if (result > 0)
return E_BUFFER_NOT_FULL;
if ((pos + len) > stop)
return E_FILE_FORMAT_INVALID;
if ((pos + len) > available)
return E_BUFFER_NOT_FULL;
const long long size = ReadUInt(m_pReader, pos, len);
if (size < 0) //error
return static_cast<long>(size);
pos += len; //consume length of size of element
//Pos now points to start of payload
if ((pos + size) > stop)
return E_FILE_FORMAT_INVALID;
if ((pos + size) > available)
return E_BUFFER_NOT_FULL;
if (id == 0x0F43B675) //Cluster ID
{
len = static_cast<long>(size);
return 0; //success
}
pos += size; //consume payload
}
return E_FILE_FORMAT_INVALID;
}
#endif
long Segment::ParseCluster(long long& off, long long& new_pos) const
{
off = -1;
new_pos = -1;
const long long stop = m_start + m_size;
assert(m_pos <= stop);
long long pos = m_pos;
while (pos < stop)
{
long len;
const long long idpos = pos;
const long long id = SyncReadUInt(m_pReader, pos, stop, len);
if (id < 0) //error
return static_cast<long>(id);
if (id == 0)
return E_FILE_FORMAT_INVALID;
pos += len; //consume id
assert(pos < stop);
const long long size = SyncReadUInt(m_pReader, pos, stop, len);
if (size < 0) //error
return static_cast<long>(size);
pos += len; //consume size
assert(pos <= stop);
if (size == 0) //weird
continue;
//pos now points to start of payload
pos += size; //consume payload
assert(pos <= stop);
if (id == 0x0F43B675) //Cluster ID
{
const long long off_ = idpos - m_start;
if (Cluster::HasBlockEntries(this, off_))
{
off = off_; // >= 0 means we found a cluster
break;
}
}
}
assert(pos <= stop);
//Indicate to caller how much of file has been consumed. This is
//used later in AddCluster to adjust the current parse position
//(the value cached in the segment object itself) to the
//file position value just past the cluster we parsed.
if (off < 0) //we did not found any more clusters
{
new_pos = stop; //pos >= 0 here means EOF (cluster is NULL)
return 0; //TODO: confirm this return value
}
//We found a cluster. Now read something, to ensure that it is
//fully loaded in the network cache.
if (pos >= stop) //we parsed the entire segment
{
//We did find a cluster, but it was very last element in the segment.
//Our preference is that the loop above runs 1 1/2 times:
//the first pass finds the cluster, and the second pass
//finds the element the follows the cluster. In this case, however,
//we reached the end of the file without finding another element,
//so we didn't actually read anything yet associated with "end of the
//cluster". And we must perform an actual read, in order
//to guarantee that all of the data that belongs to this
//cluster has been loaded into the network cache. So instead
//of reading the next element that follows the cluster, we
//read the last byte of the cluster (which is also the last
//byte in the file).
//Read the last byte of the file. (Reading 0 bytes at pos
//might work too -- it would depend on how the reader is
//implemented. Here we take the more conservative approach,
//since this makes fewer assumptions about the network
//reader abstraction.)
unsigned char b;
const int result = m_pReader->Read(pos - 1, 1, &b);
assert(result == 0);
new_pos = stop;
}
else
{
long len;
const long long idpos = pos;
const long long id = SyncReadUInt(m_pReader, pos, stop, len);
if (id < 0) //error
return static_cast<long>(id);
if (id == 0)
return E_BUFFER_NOT_FULL;
pos += len; //consume id
assert(pos < stop);
const long long size = SyncReadUInt(m_pReader, pos, stop, len);
if (size < 0) //error
return static_cast<long>(size);
new_pos = idpos;
}
return 0;
}
bool Segment::AddCluster(long long off, long long pos)
{
assert(pos >= m_start);
const long long stop = m_start + m_size;
assert(pos <= stop);
if (off >= 0)
{
Cluster* const pCluster = Cluster::Parse(this,
m_clusterCount,
off,
0,
0);
assert(pCluster);
AppendCluster(pCluster);
assert(m_clusters);
assert(m_clusterSize > pCluster->m_index);
assert(m_clusters[pCluster->m_index] == pCluster);
}
m_pos = pos; //m_pos >= stop is now we know we have all clusters
return (pos >= stop);
}
long Segment::LoadCluster(
long long& pos,
long& len)
{
long long total, avail;
const int status = m_pReader->Length(&total, &avail);
if (status < 0) //error
return status;
assert(total >= 0);
assert(avail <= total);
const long long stop = m_start + m_size;
while (m_pos < stop)
{
pos = m_pos;
//Read ID
if ((pos + 1) > avail)
{
len = 1;
return E_BUFFER_NOT_FULL;
}
long long result = GetUIntLength(m_pReader, pos, len);
if (result < 0) //error
return static_cast<long>(result);
if (result > 0) //weird
{
len = 1;
return E_BUFFER_NOT_FULL;
}
if ((pos + len) > stop)
return E_FILE_FORMAT_INVALID;
if ((pos + len) > avail)
return E_BUFFER_NOT_FULL;
const long long idpos = pos;
const long long id = ReadUInt(m_pReader, idpos, len);
if (id < 0) //error
return static_cast<long>(id);
pos += len; //consume ID
//Read Size
if ((pos + 1) > avail)
{
len = 1;
return E_BUFFER_NOT_FULL;
}
result = GetUIntLength(m_pReader, pos, len);
if (result < 0) //error
return static_cast<long>(result);
if (result > 0) //weird
{
len = 1;
return E_BUFFER_NOT_FULL;
}
if ((pos + len) > stop)
return E_FILE_FORMAT_INVALID;
if ((pos + len) > avail)
return E_BUFFER_NOT_FULL;
const long long size = ReadUInt(m_pReader, pos, len);
if (size < 0) //error
return static_cast<long>(size);
pos += len; //consume length of size of element
const long long element_size = size + pos - idpos;
if (size == 0) //weird
{
m_pos = pos;
continue;
}
//Pos now points to start of payload
if ((pos + size) > stop)
return E_FILE_FORMAT_INVALID;
len = static_cast<long>(size);
if ((pos + size) > avail)
return E_BUFFER_NOT_FULL;
if (id == 0x0C53BB6B) //Cues ID
{
if (m_pCues == NULL)
{
m_pCues = new Cues(this,
pos,
size,
idpos,
element_size);
assert(m_pCues); //TODO
}
m_pos = pos + size; //consume payload
continue;
}
if (id != 0x0F43B675) //Cluster ID
{
m_pos = pos + size; //consume payload
continue;
}
const long idx = m_clusterCount;
const long long idoff = idpos - m_start;
if (m_clusterPreloadCount > 0)
{
assert(idx < m_clusterSize);
Cluster* const pCluster = m_clusters[idx];
assert(pCluster);
assert(pCluster->m_index < 0);
const long long off_ = pCluster->m_pos;
assert(off_);
const long long off = off_ * ((off_ >= 0) ? 1 : -1);
assert(idoff <= off);
if (idoff == off) //cluster has been preloaded already
{
pCluster->m_index = idx;
++m_clusterCount;
--m_clusterPreloadCount;
pCluster->Load(); //establish invariant
m_pos = pos + size; //consume payload
assert(m_pos <= stop);
return 0; //we have a new cluster
}
}
m_pos = pos + size; //consume payload
assert(m_pos <= stop);
if (Cluster::HasBlockEntries(this, idoff))
{
Cluster* const pCluster = Cluster::Parse(this,
idx,
idoff,
idpos,
element_size);
assert(pCluster);
AppendCluster(pCluster);
assert(m_clusters);
assert(idx < m_clusterSize);
assert(m_clusters[idx] == pCluster);
pCluster->Load(); //establish invariant
return 0; //we have a new cluster
}
}
assert(m_pos <= stop);
return 1; //no error, but no new cluster either
}
void Segment::AppendCluster(Cluster* pCluster)
{
assert(pCluster);
assert(pCluster->m_index >= 0);
const long count = m_clusterCount + m_clusterPreloadCount;
long& size = m_clusterSize;
assert(size >= count);
const long idx = pCluster->m_index;
assert(idx == m_clusterCount);
if (count >= size)
{
long n;
if (size > 0)
n = 2 * size;
else if (m_pInfo == 0)
n = 2048;
else
{
const long long ns = m_pInfo->GetDuration();
if (ns <= 0)
n = 2048;
else
{
const long long sec = (ns + 999999999LL) / 1000000000LL;
n = static_cast<long>(sec);
}
}
Cluster** const qq = new Cluster*[n];
Cluster** q = qq;
Cluster** p = m_clusters;
Cluster** const pp = p + count;
while (p != pp)
*q++ = *p++;
delete[] m_clusters;
m_clusters = qq;
size = n;
}
if (m_clusterPreloadCount > 0)
{
assert(m_clusters);
Cluster** const p = m_clusters + m_clusterCount;
assert(*p);
assert((*p)->m_index < 0);
Cluster** q = p + m_clusterPreloadCount;
assert(q < (m_clusters + size));
for (;;)
{
Cluster** const qq = q - 1;
assert((*qq)->m_index < 0);
*q = *qq;
q = qq;
if (q == p)
break;
}
}
m_clusters[idx] = pCluster;
++m_clusterCount;
}
void Segment::PreloadCluster(Cluster* pCluster, ptrdiff_t idx)
{
assert(pCluster);
assert(pCluster->m_index < 0);
assert(idx >= m_clusterCount);
const long count = m_clusterCount + m_clusterPreloadCount;
long& size = m_clusterSize;
assert(size >= count);
if (count >= size)
{
long n;
if (size > 0)
n = 2 * size;
else if (m_pInfo == 0)
n = 2048;
else
{
const long long ns = m_pInfo->GetDuration();
if (ns <= 0)
n = 2048;
else
{
const long long sec = (ns + 999999999LL) / 1000000000LL;
n = static_cast<long>(sec);
}
}
Cluster** const qq = new Cluster*[n];
Cluster** q = qq;
Cluster** p = m_clusters;
Cluster** const pp = p + count;
while (p != pp)
*q++ = *p++;
delete[] m_clusters;
m_clusters = qq;
size = n;
}
assert(m_clusters);
Cluster** const p = m_clusters + idx;
Cluster** q = m_clusters + count;
assert(q >= p);
assert(q < (m_clusters + size));
while (q > p)
{
Cluster** const qq = q - 1;
assert((*qq)->m_index < 0);
*q = *qq;
q = qq;
}
m_clusters[idx] = pCluster;
++m_clusterPreloadCount;
}
long Segment::Load()
{
assert(m_clusters == NULL);
assert(m_clusterSize == 0);
assert(m_clusterCount == 0);
//Outermost (level 0) segment object has been constructed,
//and pos designates start of payload. We need to find the
//inner (level 1) elements.
const long long stop = m_start + m_size;
#ifdef _DEBUG //TODO: this is really Microsoft-specific
{
long long total, available;
long hr = m_pReader->Length(&total, &available);
assert(hr >= 0);
assert(available >= total);
assert(stop <= total);
}
#endif
while (m_pos < stop)
{
long long pos = m_pos;
const long long element_start = pos;
long len;
long long result = GetUIntLength(m_pReader, pos, len);
if (result < 0) //error
return static_cast<long>(result);
if ((pos + len) > stop)
return E_FILE_FORMAT_INVALID;
const long long idpos = pos;
const long long id = ReadUInt(m_pReader, idpos, len);
if (id < 0) //error
return static_cast<long>(id);
pos += len; //consume ID
//Read Size
result = GetUIntLength(m_pReader, pos, len);
if (result < 0) //error
return static_cast<long>(result);
if ((pos + len) > stop)
return E_FILE_FORMAT_INVALID;
const long long size = ReadUInt(m_pReader, pos, len);
if (size < 0) //error
return static_cast<long>(size);
pos += len; //consume length of size of element
const long long element_size = size + pos - element_start;
//Pos now points to start of payload
if ((pos + size) > stop)
return E_FILE_FORMAT_INVALID;
if (id == 0x0F43B675) //Cluster ID
{
const long idx = m_clusterCount;
const long long off = idpos - m_start;
if (Cluster::HasBlockEntries(this, off))
{
Cluster* const pCluster = Cluster::Parse(this,
idx,
off,
element_start,
element_size);
assert(pCluster);
AppendCluster(pCluster);
assert(m_clusters);
assert(m_clusterSize > idx);
assert(m_clusters[idx] == pCluster);
}
}
else if (id == 0x0C53BB6B) //Cues ID
{
assert(m_pCues == NULL);
m_pCues = new Cues(this, pos, size, element_start, element_size);
assert(m_pCues); //TODO
}
else if (id == 0x0549A966) //SegmentInfo ID
{
assert(m_pInfo == NULL);
m_pInfo = new SegmentInfo(this,
pos,
size,
element_start,
element_size);
assert(m_pInfo);
}
else if (id == 0x0654AE6B) //Tracks ID
{
assert(m_pTracks == NULL);
m_pTracks = new Tracks(this,
pos,
size,
element_start,
element_size);
assert(m_pTracks); //TODO
}
m_pos = pos + size; //consume payload
}
assert(m_pos >= stop);
if (m_pInfo == NULL)
return E_FILE_FORMAT_INVALID; //TODO: ignore this case?
if (m_pTracks == NULL)
return E_FILE_FORMAT_INVALID;
if (m_clusters == NULL) //TODO: ignore this case?
return E_FILE_FORMAT_INVALID;
//TODO: decide whether we require Cues element
//if (m_pCues == NULL)
// return E_FILE_FORMAT_INVALID;
return 0;
}
void Segment::ParseSeekHead(long long start, long long size_)
{
long long pos = start;
const long long stop = start + size_;
while (pos < stop)
{
long len;
const long long id = ReadUInt(m_pReader, pos, len);
assert(id >= 0); //TODO
assert((pos + len) <= stop);
pos += len; //consume ID
const long long size = ReadUInt(m_pReader, pos, len);
assert(size >= 0);
assert((pos + len) <= stop);
pos += len; //consume Size field
assert((pos + size) <= stop);
if (id == 0x0DBB) //SeekEntry ID
ParseSeekEntry(pos, size);
pos += size; //consume payload
assert(pos <= stop);
}
assert(pos == stop);
}
void Segment::ParseCues(long long off)
{
if (m_pCues)
return;
//odbgstream os;
//os << "Segment::ParseCues (begin)" << endl;
long long pos = m_start + off;
const long long element_start = pos;
const long long stop = m_start + m_size;
long len;
long long result = GetUIntLength(m_pReader, pos, len);
assert(result == 0);
assert((pos + len) <= stop);
const long long idpos = pos;
const long long id = ReadUInt(m_pReader, idpos, len);
assert(id == 0x0C53BB6B); //Cues ID
pos += len; //consume ID
assert(pos < stop);
//Read Size
result = GetUIntLength(m_pReader, pos, len);
assert(result == 0);
assert((pos + len) <= stop);
const long long size = ReadUInt(m_pReader, pos, len);
assert(size >= 0);
pos += len; //consume length of size of element
assert((pos + size) <= stop);
const long long element_size = size + pos - element_start;
//Pos now points to start of payload
m_pCues = new Cues(this, pos, size, element_start, element_size);
assert(m_pCues); //TODO
//os << "Segment::ParseCues (end)" << endl;
}
void Segment::ParseSeekEntry(
long long start,
long long size_)
{
long long pos = start;
const long long stop = start + size_;
long len;
const long long seekIdId = ReadUInt(m_pReader, pos, len);
//seekIdId;
assert(seekIdId == 0x13AB); //SeekID ID
assert((pos + len) <= stop);
pos += len; //consume id
const long long seekIdSize = ReadUInt(m_pReader, pos, len);
assert(seekIdSize >= 0);
assert((pos + len) <= stop);
pos += len; //consume size
const long long seekId = ReadUInt(m_pReader, pos, len); //payload
assert(seekId >= 0);
assert(len == seekIdSize);
assert((pos + len) <= stop);
pos += seekIdSize; //consume payload
const long long seekPosId = ReadUInt(m_pReader, pos, len);
//seekPosId;
assert(seekPosId == 0x13AC); //SeekPos ID
assert((pos + len) <= stop);
pos += len; //consume id
const long long seekPosSize = ReadUInt(m_pReader, pos, len);
assert(seekPosSize >= 0);
assert((pos + len) <= stop);
pos += len; //consume size
assert((pos + seekPosSize) <= stop);
const long long seekOff = UnserializeUInt(m_pReader, pos, seekPosSize);
assert(seekOff >= 0);
assert(seekOff < m_size);
pos += seekPosSize; //consume payload
assert(pos == stop);
const long long seekPos = m_start + seekOff;
assert(seekPos < (m_start + m_size));
if (seekId == 0x0C53BB6B) //Cues ID
ParseCues(seekOff);
}
Cues::Cues(
Segment* pSegment,
long long start_,
long long size_,
long long element_start,
long long element_size) :
m_pSegment(pSegment),
m_start(start_),
m_size(size_),
m_cue_points(NULL),
m_count(0),
m_preload_count(0),
m_pos(start_),
m_element_start(element_start),
m_element_size(element_size)
{
}
Cues::~Cues()
{
const size_t n = m_count + m_preload_count;
CuePoint** p = m_cue_points;
CuePoint** const q = p + n;
while (p != q)
{
CuePoint* const pCP = *p++;
assert(pCP);
delete pCP;
}
delete[] m_cue_points;
}
void Cues::Init() const
{
if (m_cue_points)
return;
assert(m_count == 0);
assert(m_preload_count == 0);
IMkvReader* const pReader = m_pSegment->m_pReader;
const long long stop = m_start + m_size;
long long pos = m_start;
size_t cue_points_size = 0;
while (pos < stop)
{
const long long idpos = pos;
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0); //TODO
assert((pos + len) <= stop);
pos += len; //consume ID
const long long size = ReadUInt(pReader, pos, len);
assert(size >= 0);
assert((pos + len) <= stop);
pos += len; //consume Size field
assert((pos + size) <= stop);
if (id == 0x3B) //CuePoint ID
PreloadCuePoint(cue_points_size, idpos);
pos += size; //consume payload
assert(pos <= stop);
}
}
void Cues::PreloadCuePoint(
size_t& cue_points_size,
long long pos) const
{
assert(m_count == 0);
if (m_preload_count >= cue_points_size)
{
size_t n;
if (cue_points_size > 0)
n = static_cast<size_t>(2 * cue_points_size);
else
{
const SegmentInfo* const pInfo = m_pSegment->GetInfo();
if (pInfo == NULL)
n = 2048;
else
{
const long long ns = pInfo->GetDuration();
if (ns <= 0)
n = 2048;
else
{
const long long sec = (ns + 999999999LL) / 1000000000LL;
n = static_cast<size_t>(sec);
}
}
}
CuePoint** const qq = new CuePoint*[n];
CuePoint** q = qq; //beginning of target
CuePoint** p = m_cue_points; //beginning of source
CuePoint** const pp = p + m_preload_count; //end of source
while (p != pp)
*q++ = *p++;
delete[] m_cue_points;
m_cue_points = qq;
cue_points_size = n;
}
CuePoint* const pCP = new CuePoint(m_preload_count, pos);
m_cue_points[m_preload_count++] = pCP;
}
bool Cues::LoadCuePoint() const
{
//odbgstream os;
//os << "Cues::LoadCuePoint" << endl;
const long long stop = m_start + m_size;
if (m_pos >= stop)
return false; //nothing else to do
Init();
IMkvReader* const pReader = m_pSegment->m_pReader;
while (m_pos < stop)
{
const long long idpos = m_pos;
long len;
const long long id = ReadUInt(pReader, m_pos, len);
assert(id >= 0); //TODO
assert((m_pos + len) <= stop);
m_pos += len; //consume ID
const long long size = ReadUInt(pReader, m_pos, len);
assert(size >= 0);
assert((m_pos + len) <= stop);
m_pos += len; //consume Size field
assert((m_pos + size) <= stop);
if (id != 0x3B) //CuePoint ID
{
m_pos += size; //consume payload
assert(m_pos <= stop);
continue;
}
assert(m_preload_count > 0);
CuePoint* const pCP = m_cue_points[m_count];
assert(pCP);
assert((pCP->GetTimeCode() >= 0) || (-pCP->GetTimeCode() == idpos));
pCP->Load(pReader);
++m_count;
--m_preload_count;
m_pos += size; //consume payload
assert(m_pos <= stop);
break;
}
return (m_pos < stop);
}
bool Cues::Find(
long long time_ns,
const Track* pTrack,
const CuePoint*& pCP,
const CuePoint::TrackPosition*& pTP) const
{
assert(time_ns >= 0);
assert(pTrack);
LoadCuePoint();
assert(m_cue_points);
assert(m_count > 0);
CuePoint** const ii = m_cue_points;
CuePoint** i = ii;
CuePoint** const jj = ii + m_count + m_preload_count;
CuePoint** j = jj;
pCP = *i;
assert(pCP);
if (time_ns <= pCP->GetTime(m_pSegment))
{
pTP = pCP->Find(pTrack);
return (pTP != NULL);
}
IMkvReader* const pReader = m_pSegment->m_pReader;
while (i < j)
{
//INVARIANT:
//[ii, i) <= time_ns
//[i, j) ?
//[j, jj) > time_ns
CuePoint** const k = i + (j - i) / 2;
assert(k < jj);
CuePoint* const pCP = *k;
assert(pCP);
pCP->Load(pReader);
const long long t = pCP->GetTime(m_pSegment);
if (t <= time_ns)
i = k + 1;
else
j = k;
assert(i <= j);
}
assert(i == j);
assert(i <= jj);
assert(i > ii);
pCP = *--i;
assert(pCP);
assert(pCP->GetTime(m_pSegment) <= time_ns);
//TODO: here and elsewhere, it's probably not correct to search
//for the cue point with this time, and then search for a matching
//track. In principle, the matching track could be on some earlier
//cue point, and with our current algorithm, we'd miss it. To make
//this bullet-proof, we'd need to create a secondary structure,
//with a list of cue points that apply to a track, and then search
//that track-based structure for a matching cue point.
pTP = pCP->Find(pTrack);
return (pTP != NULL);
}
#if 0
bool Cues::FindNext(
long long time_ns,
const Track* pTrack,
const CuePoint*& pCP,
const CuePoint::TrackPosition*& pTP) const
{
pCP = 0;
pTP = 0;
if (m_count == 0)
return false;
assert(m_cue_points);
const CuePoint* const* const ii = m_cue_points;
const CuePoint* const* i = ii;
const CuePoint* const* const jj = ii + m_count;
const CuePoint* const* j = jj;
while (i < j)
{
//INVARIANT:
//[ii, i) <= time_ns
//[i, j) ?
//[j, jj) > time_ns
const CuePoint* const* const k = i + (j - i) / 2;
assert(k < jj);
pCP = *k;
assert(pCP);
const long long t = pCP->GetTime(m_pSegment);
if (t <= time_ns)
i = k + 1;
else
j = k;
assert(i <= j);
}
assert(i == j);
assert(i <= jj);
if (i >= jj) //time_ns is greater than max cue point
return false;
pCP = *i;
assert(pCP);
assert(pCP->GetTime(m_pSegment) > time_ns);
pTP = pCP->Find(pTrack);
return (pTP != NULL);
}
#endif
const CuePoint* Cues::GetFirst() const
{
LoadCuePoint(); //init cues
const size_t count = m_count + m_preload_count;
if (count == 0) //weird
return NULL;
CuePoint* const* const pp = m_cue_points;
assert(pp);
CuePoint* const pCP = pp[0];
assert(pCP);
assert(pCP->GetTimeCode() >= 0);
return pCP;
}
const CuePoint* Cues::GetLast() const
{
LoadCuePoint(); //init cues
const size_t count = m_count + m_preload_count;
if (count == 0) //weird
return NULL;
const size_t index = count - 1;
CuePoint* const* const pp = m_cue_points;
assert(pp);
CuePoint* const pCP = pp[index];
assert(pCP);
pCP->Load(m_pSegment->m_pReader);
assert(pCP->GetTimeCode() >= 0);
return pCP;
}
const CuePoint* Cues::GetNext(const CuePoint* pCurr) const
{
if (pCurr == NULL)
return NULL;
assert(pCurr->GetTimeCode() >= 0);
assert(m_cue_points);
assert(m_count >= 1);
const size_t count = m_count + m_preload_count;
size_t index = pCurr->m_index;
assert(index < count);
CuePoint* const* const pp = m_cue_points;
assert(pp);
assert(pp[index] == pCurr);
++index;
if (index >= count)
return NULL;
CuePoint* const pNext = pp[index];
assert(pNext);
pNext->Load(m_pSegment->m_pReader);
return pNext;
}
const BlockEntry* Cues::GetBlock(
const CuePoint* pCP,
const CuePoint::TrackPosition* pTP) const
{
if (pCP == NULL)
return NULL;
if (pTP == NULL)
return NULL;
return m_pSegment->GetBlock(*pCP, *pTP);
}
const BlockEntry* Segment::GetBlock(
const CuePoint& cp,
const CuePoint::TrackPosition& tp)
{
Cluster** const ii = m_clusters;
Cluster** i = ii;
const long count = m_clusterCount + m_clusterPreloadCount;
Cluster** const jj = ii + count;
Cluster** j = jj;
while (i < j)
{
//INVARIANT:
//[ii, i) < pTP->m_pos
//[i, j) ?
//[j, jj) > pTP->m_pos
Cluster** const k = i + (j - i) / 2;
assert(k < jj);
Cluster* const pCluster = *k;
assert(pCluster);
const long long pos_ = pCluster->m_pos;
assert(pos_);
const long long pos = pos_ * ((pos_ < 0) ? -1 : 1);
if (pos < tp.m_pos)
i = k + 1;
else if (pos > tp.m_pos)
j = k;
else
return pCluster->GetEntry(cp, tp);
}
assert(i == j);
assert(Cluster::HasBlockEntries(this, tp.m_pos));
Cluster* const pCluster = Cluster::Parse(this, -1, tp.m_pos, 0, 0);
assert(pCluster);
const ptrdiff_t idx = i - m_clusters;
PreloadCluster(pCluster, idx);
assert(m_clusters);
assert(m_clusterPreloadCount > 0);
assert(m_clusters[idx] == pCluster);
return pCluster->GetEntry(cp, tp);
}
CuePoint::CuePoint(size_t idx, long long pos) :
m_element_start(0),
m_element_size(0),
m_index(idx),
m_timecode(-1 * pos),
m_track_positions(NULL),
m_track_positions_count(0)
{
assert(pos > 0);
}
CuePoint::~CuePoint()
{
delete[] m_track_positions;
}
void CuePoint::Load(IMkvReader* pReader)
{
//odbgstream os;
//os << "CuePoint::Load(begin): timecode=" << m_timecode << endl;
if (m_timecode >= 0) //already loaded
return;
assert(m_track_positions == NULL);
assert(m_track_positions_count == 0);
long long pos_ = -m_timecode;
const long long element_start = pos_;
long long stop;
{
long len;
const long long id = ReadUInt(pReader, pos_, len);
assert(id == 0x3B); //CuePoint ID
//assert((pos + len) <= stop);
pos_ += len; //consume ID
const long long size = ReadUInt(pReader, pos_, len);
assert(size >= 0);
//assert((pos + len) <= stop);
pos_ += len; //consume Size field
//assert((pos + size) <= stop);
//pos_ now points to start of payload
stop = pos_ + size;
}
const long long element_size = stop - element_start;
long long pos = pos_;
//First count number of track positions
while (pos < stop)
{
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0); //TODO
assert((pos + len) <= stop);
pos += len; //consume ID
const long long size = ReadUInt(pReader, pos, len);
assert(size >= 0);
assert((pos + len) <= stop);
pos += len; //consume Size field
assert((pos + size) <= stop);
if (id == 0x33) //CueTime ID
m_timecode = UnserializeUInt(pReader, pos, size);
else if (id == 0x37) //CueTrackPosition(s) ID
++m_track_positions_count;
pos += size; //consume payload
assert(pos <= stop);
}
assert(m_timecode >= 0);
assert(m_track_positions_count > 0);
//os << "CuePoint::Load(cont'd): idpos=" << idpos
// << " timecode=" << m_timecode
// << endl;
m_track_positions = new TrackPosition[m_track_positions_count];
//Now parse track positions
TrackPosition* p = m_track_positions;
pos = pos_;
while (pos < stop)
{
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0); //TODO
assert((pos + len) <= stop);
pos += len; //consume ID
const long long size = ReadUInt(pReader, pos, len);
assert(size >= 0);
assert((pos + len) <= stop);
pos += len; //consume Size field
assert((pos + size) <= stop);
if (id == 0x37) //CueTrackPosition(s) ID
{
TrackPosition& tp = *p++;
tp.Parse(pReader, pos, size);
}
pos += size; //consume payload
assert(pos <= stop);
}
assert(size_t(p - m_track_positions) == m_track_positions_count);
m_element_start = element_start;
m_element_size = element_size;
}
void CuePoint::TrackPosition::Parse(
IMkvReader* pReader,
long long start_,
long long size_)
{
const long long stop = start_ + size_;
long long pos = start_;
m_track = -1;
m_pos = -1;
m_block = 1; //default
while (pos < stop)
{
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0); //TODO
assert((pos + len) <= stop);
pos += len; //consume ID
const long long size = ReadUInt(pReader, pos, len);
assert(size >= 0);
assert((pos + len) <= stop);
pos += len; //consume Size field
assert((pos + size) <= stop);
if (id == 0x77) //CueTrack ID
m_track = UnserializeUInt(pReader, pos, size);
else if (id == 0x71) //CueClusterPos ID
m_pos = UnserializeUInt(pReader, pos, size);
else if (id == 0x1378) //CueBlockNumber
m_block = UnserializeUInt(pReader, pos, size);
pos += size; //consume payload
assert(pos <= stop);
}
assert(m_pos >= 0);
assert(m_track > 0);
//assert(m_block > 0);
}
const CuePoint::TrackPosition* CuePoint::Find(const Track* pTrack) const
{
assert(pTrack);
const long long n = pTrack->GetNumber();
const TrackPosition* i = m_track_positions;
const TrackPosition* const j = i + m_track_positions_count;
while (i != j)
{
const TrackPosition& p = *i++;
if (p.m_track == n)
return &p;
}
return NULL; //no matching track number found
}
long long CuePoint::GetTimeCode() const
{
return m_timecode;
}
long long CuePoint::GetTime(Segment* pSegment) const
{
assert(pSegment);
assert(m_timecode >= 0);
const SegmentInfo* const pInfo = pSegment->GetInfo();
assert(pInfo);
const long long scale = pInfo->GetTimeCodeScale();
assert(scale >= 1);
const long long time = scale * m_timecode;
return time;
}
long long Segment::Unparsed() const
{
const long long stop = m_start + m_size;
const long long result = stop - m_pos;
assert(result >= 0);
return result;
}
const Cluster* Segment::GetFirst() const
{
if ((m_clusters == NULL) || (m_clusterCount <= 0))
return &m_eos;
Cluster* const pCluster = m_clusters[0];
assert(pCluster);
return pCluster;
}
const Cluster* Segment::GetLast() const
{
if ((m_clusters == NULL) || (m_clusterCount <= 0))
return &m_eos;
const long idx = m_clusterCount - 1;
Cluster* const pCluster = m_clusters[idx];
assert(pCluster);
return pCluster;
}
unsigned long Segment::GetCount() const
{
return m_clusterCount;
}
const Cluster* Segment::GetNext(const Cluster* pCurr)
{
assert(pCurr);
assert(pCurr != &m_eos);
assert(m_clusters);
long idx = pCurr->m_index;
if (idx >= 0)
{
assert(m_clusterCount > 0);
assert(idx < m_clusterCount);
assert(pCurr == m_clusters[idx]);
++idx;
if (idx >= m_clusterCount)
return &m_eos; //caller will LoadCluster as desired
Cluster* const pNext = m_clusters[idx];
assert(pNext);
assert(pNext->m_index >= 0);
assert(pNext->m_index == idx);
return pNext;
}
assert(m_clusterPreloadCount > 0);
const long long off_ = pCurr->m_pos;
const long long off = off_ * ((off_ < 0) ? -1 : 1);
long long pos = m_start + off;
const long long stop = m_start + m_size; //end of segment
{
long len;
long long result = GetUIntLength(m_pReader, pos, len);
assert(result == 0); //TODO
assert((pos + len) <= stop); //TODO
const long long id = ReadUInt(m_pReader, pos, len);
assert(id == 0x0F43B675); //Cluster ID //TODO
pos += len; //consume ID
//Read Size
result = GetUIntLength(m_pReader, pos, len);
assert(result == 0); //TODO
assert((pos + len) <= stop); //TODO
const long long size = ReadUInt(m_pReader, pos, len);
assert(size > 0); //TODO
assert((pCurr->m_size <= 0) || (pCurr->m_size == size));
pos += len; //consume length of size of element
assert((pos + size) <= stop); //TODO
//Pos now points to start of payload
pos += size; //consume payload
}
long long off_next = 0;
long long element_start_next = 0;
long long element_size_next = 0;
while (pos < stop)
{
long len;
long long result = GetUIntLength(m_pReader, pos, len);
assert(result == 0); //TODO
assert((pos + len) <= stop); //TODO
const long long idpos = pos; //pos of next (potential) cluster
const long long id = ReadUInt(m_pReader, idpos, len);
assert(id > 0); //TODO
pos += len; //consume ID
//Read Size
result = GetUIntLength(m_pReader, pos, len);
assert(result == 0); //TODO
assert((pos + len) <= stop); //TODO
const long long size = ReadUInt(m_pReader, pos, len);
assert(size >= 0); //TODO
pos += len; //consume length of size of element
assert((pos + size) <= stop); //TODO
const long long element_size = size + pos - idpos;
//Pos now points to start of payload
if (size == 0) //weird
continue;
if (id == 0x0F43B675) //Cluster ID
{
const long long off_next_ = idpos - m_start;
if (Cluster::HasBlockEntries(this, off_next_))
{
off_next = off_next_;
element_start_next = idpos;
element_size_next = element_size;
break;
}
}
pos += size; //consume payload
}
if (off_next <= 0)
return 0;
Cluster** const ii = m_clusters + m_clusterCount;
Cluster** i = ii;
Cluster** const jj = ii + m_clusterPreloadCount;
Cluster** j = jj;
while (i < j)
{
//INVARIANT:
//[0, i) < pos_next
//[i, j) ?
//[j, jj) > pos_next
Cluster** const k = i + (j - i) / 2;
assert(k < jj);
Cluster* const pNext = *k;
assert(pNext);
assert(pNext->m_index < 0);
const long long pos_ = pNext->m_pos;
assert(pos_);
pos = pos_ * ((pos_ < 0) ? -1 : 1);
if (pos < off_next)
i = k + 1;
else if (pos > off_next)
j = k;
else
return pNext;
}
assert(i == j);
Cluster* const pNext = Cluster::Parse(this,
-1,
off_next,
element_start_next,
element_size_next);
assert(pNext);
const ptrdiff_t idx_next = i - m_clusters; //insertion position
PreloadCluster(pNext, idx_next);
assert(m_clusters);
assert(idx_next < m_clusterSize);
assert(m_clusters[idx_next] == pNext);
return pNext;
}
long Segment::ParseNext(
const Cluster* pCurr,
const Cluster*& pResult,
long long& pos,
long& len)
{
assert(pCurr);
assert(!pCurr->EOS());
assert(m_clusters);
pResult = 0;
if (pCurr->m_index >= 0) //loaded (not merely preloaded)
{
assert(m_clusters[pCurr->m_index] == pCurr);
const long next_idx = pCurr->m_index + 1;
if (next_idx < m_clusterCount)
{
pResult = m_clusters[next_idx];
return 0; //success
}
//curr cluster is last among loaded
const long result = LoadCluster(pos, len);
if (result < 0) //error or underflow
return result;
if (result > 0) //no more clusters
return 1;
pResult = GetLast();
return 0; //success
}
long long total, avail;
const int status = m_pReader->Length(&total, &avail);
if (status < 0) //error
return status;
assert(total >= 0);
assert(avail <= total);
const long long off_curr_ = pCurr->m_pos;
const long long off_curr = off_curr_ * ((off_curr_ < 0) ? -1 : 1);
pos = m_start + off_curr;
const long long stop = m_start + m_size; //end of segment
{
if ((pos + 1) > avail)
{
len = 1;
return E_BUFFER_NOT_FULL;
}
long long result = GetUIntLength(m_pReader, pos, len);
if (result < 0) //error
return static_cast<long>(result);
if (result > 0) //weird
{
len = 1;
return E_BUFFER_NOT_FULL;
}
if ((pos + len) > stop)
return E_FILE_FORMAT_INVALID;
if ((pos + len) > avail)
return E_BUFFER_NOT_FULL;
const long long id = ReadUInt(m_pReader, pos, len);
if (id != 0x0F43B675) //weird: not Cluster ID
return -1;
pos += len; //consume ID
//Read Size
if ((pos + 1) > avail)
{
len = 1;
return E_BUFFER_NOT_FULL;
}
result = GetUIntLength(m_pReader, pos, len);
if (result < 0) //error
return static_cast<long>(result);
if (result > 0) //weird
{
len = 1;
return E_BUFFER_NOT_FULL;
}
if ((pos + len) > stop)
return E_FILE_FORMAT_INVALID;
if ((pos + len) > avail)
return E_BUFFER_NOT_FULL;
const long long size = ReadUInt(m_pReader, pos, len);
if (size < 0) //error
return static_cast<long>(size);
assert((pCurr->m_size <= 0) || (pCurr->m_size == size));
pos += len; //consume length of size of element
if ((pos + size) > stop)
return E_FILE_FORMAT_INVALID;
//Pos now points to start of payload
pos += size; //consume payload (that is, the current cluster)
assert(pos <= stop);
//By consuming the payload, we are assuming that the curr
//cluster isn't interesting. That is, we don't bother checking
//whether the payload of the curr cluster is less than what
//happens to be available (obtained via IMkvReader::Length).
//Presumably the caller has already dispensed with the current
//cluster, and really does want the next cluster.
}
//pos now points to just beyond the last fully-loaded cluster
long long off_next = 0;
long long element_start = -1;
long long element_size = -1;
while (pos < stop)
{
if ((pos + 1) > avail)
{
len = 1;
return E_BUFFER_NOT_FULL;
}
long long result = GetUIntLength(m_pReader, pos, len);
if (result < 0) //error
return static_cast<long>(result);
if (result > 0) //weird
{
len = 1;
return E_BUFFER_NOT_FULL;
}
if ((pos + len) > stop)
return E_FILE_FORMAT_INVALID;
if ((pos + len) > avail)
return E_BUFFER_NOT_FULL;
const long long idpos = pos; //absolute
const long long idoff = pos - m_start; //relative
const long long id = ReadUInt(m_pReader, idpos, len); //absolute
if (id < 0) //error
return static_cast<long>(id);
if (id == 0) //weird
return -1; //generic error
pos += len; //consume ID
//Read Size
if ((pos + 1) > avail)
{
len = 1;
return E_BUFFER_NOT_FULL;
}
result = GetUIntLength(m_pReader, pos, len);
if (result < 0) //error
return static_cast<long>(result);
if (result > 0) //weird
{
len = 1;
return E_BUFFER_NOT_FULL;
}
if ((pos + len) > stop)
return E_FILE_FORMAT_INVALID;
if ((pos + len) > avail)
return E_BUFFER_NOT_FULL;
const long long size = ReadUInt(m_pReader, pos, len);
if (size < 0) //error
return static_cast<long>(size);
pos += len; //consume length of size of element
//Pos now points to start of payload
if (size == 0) //weird
continue;
element_start = idpos;
const long long element_stop = pos + size;
if (element_stop > stop)
return E_FILE_FORMAT_INVALID;
element_size = element_stop - element_start;
if (id == 0x0C53BB6B) //Cues ID
{
if (m_pCues == NULL)
{
m_pCues = new Cues(this,
pos,
size,
element_start,
element_size);
assert(m_pCues); //TODO
}
pos += size; //consume payload
assert(pos <= stop);
continue;
}
if (id != 0x0F43B675) //Cluster ID
{
pos += size; //consume payload
assert(pos <= stop);
continue;
}
len = static_cast<long>(size);
#if 1 //TODO: get rid of this
if (element_stop > avail)
return E_BUFFER_NOT_FULL;
#endif
if (Cluster::HasBlockEntries(this, idoff)) //relative
{
off_next = idoff;
break;
}
pos += size; //consume payload
assert(pos <= stop);
}
if (off_next <= 0) //no next cluster found
return 1;
//We have parsed the next cluster, and can even guarantee
//that its payload is all available (IMkvReader::Length).
//All we need to do now is determine whether it has already
//be preloaded.
Cluster** const ii = m_clusters + m_clusterCount;
Cluster** i = ii;
Cluster** const jj = ii + m_clusterPreloadCount;
Cluster** j = jj;
while (i < j)
{
//INVARIANT:
//[0, i) < pos_next
//[i, j) ?
//[j, jj) > pos_next
Cluster** const k = i + (j - i) / 2;
assert(k < jj);
const Cluster* const pNext = *k;
assert(pNext);
assert(pNext->m_index < 0);
const long long pos_ = pNext->m_pos;
assert(pos_);
pos = pos_ * ((pos_ < 0) ? -1 : 1);
if (pos < off_next)
i = k + 1;
else if (pos > off_next)
j = k;
else
{
pResult = pNext;
return 0; //success
}
}
assert(i == j);
Cluster* const pNext = Cluster::Parse(this,
-1, //preloaded
off_next,
element_start,
element_size);
assert(pNext);
const ptrdiff_t idx_next = i - m_clusters; //insertion position
PreloadCluster(pNext, idx_next);
assert(m_clusters);
assert(idx_next < m_clusterSize);
assert(m_clusters[idx_next] == pNext);
pNext->Load(); //because we need this now
pResult = pNext;
return 0; //success
}
const Cluster* Segment::FindCluster(long long time_ns) const
{
if ((m_clusters == NULL) || (m_clusterCount <= 0))
return &m_eos;
{
Cluster* const pCluster = m_clusters[0];
assert(pCluster);
assert(pCluster->m_index == 0);
if (time_ns <= pCluster->GetTime())
return pCluster;
}
//Binary search of cluster array
long i = 0;
long j = m_clusterCount;
while (i < j)
{
//INVARIANT:
//[0, i) <= time_ns
//[i, j) ?
//[j, m_clusterCount) > time_ns
const long k = i + (j - i) / 2;
assert(k < m_clusterCount);
Cluster* const pCluster = m_clusters[k];
assert(pCluster);
assert(pCluster->m_index == k);
const long long t = pCluster->GetTime();
if (t <= time_ns)
i = k + 1;
else
j = k;
assert(i <= j);
}
assert(i == j);
assert(i > 0);
assert(i <= m_clusterCount);
const long k = i - 1;
Cluster* const pCluster = m_clusters[k];
assert(pCluster);
assert(pCluster->m_index == k);
assert(pCluster->GetTime() <= time_ns);
return pCluster;
}
#if 0
const BlockEntry* Segment::Seek(
long long time_ns,
const Track* pTrack) const
{
assert(pTrack);
if ((m_clusters == NULL) || (m_clusterCount <= 0))
return pTrack->GetEOS();
Cluster** const i = m_clusters;
assert(i);
{
Cluster* const pCluster = *i;
assert(pCluster);
assert(pCluster->m_index == 0); //m_clusterCount > 0
assert(pCluster->m_pSegment == this);
if (time_ns <= pCluster->GetTime())
return pCluster->GetEntry(pTrack);
}
Cluster** const j = i + m_clusterCount;
if (pTrack->GetType() == 2) //audio
{
//TODO: we could decide to use cues for this, as we do for video.
//But we only use it for video because looking around for a keyframe
//can get expensive. Audio doesn't require anything special so a
//straight cluster search is good enough (we assume).
Cluster** lo = i;
Cluster** hi = j;
while (lo < hi)
{
//INVARIANT:
//[i, lo) <= time_ns
//[lo, hi) ?
//[hi, j) > time_ns
Cluster** const mid = lo + (hi - lo) / 2;
assert(mid < hi);
Cluster* const pCluster = *mid;
assert(pCluster);
assert(pCluster->m_index == long(mid - m_clusters));
assert(pCluster->m_pSegment == this);
const long long t = pCluster->GetTime();
if (t <= time_ns)
lo = mid + 1;
else
hi = mid;
assert(lo <= hi);
}
assert(lo == hi);
assert(lo > i);
assert(lo <= j);
while (lo > i)
{
Cluster* const pCluster = *--lo;
assert(pCluster);
assert(pCluster->GetTime() <= time_ns);
const BlockEntry* const pBE = pCluster->GetEntry(pTrack);
if ((pBE != 0) && !pBE->EOS())
return pBE;
//landed on empty cluster (no entries)
}
return pTrack->GetEOS(); //weird
}
assert(pTrack->GetType() == 1); //video
Cluster** lo = i;
Cluster** hi = j;
while (lo < hi)
{
//INVARIANT:
//[i, lo) <= time_ns
//[lo, hi) ?
//[hi, j) > time_ns
Cluster** const mid = lo + (hi - lo) / 2;
assert(mid < hi);
Cluster* const pCluster = *mid;
assert(pCluster);
const long long t = pCluster->GetTime();
if (t <= time_ns)
lo = mid + 1;
else
hi = mid;
assert(lo <= hi);
}
assert(lo == hi);
assert(lo > i);
assert(lo <= j);
Cluster* pCluster = *--lo;
assert(pCluster);
assert(pCluster->GetTime() <= time_ns);
{
const BlockEntry* const pBE = pCluster->GetEntry(pTrack, time_ns);
if ((pBE != 0) && !pBE->EOS()) //found a keyframe
return pBE;
}
const VideoTrack* const pVideo = static_cast<const VideoTrack*>(pTrack);
while (lo != i)
{
pCluster = *--lo;
assert(pCluster);
assert(pCluster->GetTime() <= time_ns);
const BlockEntry* const pBlockEntry = pCluster->GetMaxKey(pVideo);
if ((pBlockEntry != 0) && !pBlockEntry->EOS())
return pBlockEntry;
}
//weird: we're on the first cluster, but no keyframe found
//should never happen but we must return something anyway
return pTrack->GetEOS();
}
#endif
#if 0
bool Segment::SearchCues(
long long time_ns,
Track* pTrack,
Cluster*& pCluster,
const BlockEntry*& pBlockEntry,
const CuePoint*& pCP,
const CuePoint::TrackPosition*& pTP)
{
if (pTrack->GetType() != 1) //not video
return false; //TODO: for now, just handle video stream
if (m_pCues == NULL)
return false;
if (!m_pCues->Find(time_ns, pTrack, pCP, pTP))
return false; //weird
assert(pCP);
assert(pTP);
assert(pTP->m_track == pTrack->GetNumber());
//We have the cue point and track position we want,
//so we now need to search for the cluster having
//the indicated position.
return GetCluster(pCP, pTP, pCluster, pBlockEntry);
}
#endif
Tracks* Segment::GetTracks() const
{
return m_pTracks;
}
const SegmentInfo* Segment::GetInfo() const
{
return m_pInfo;
}
const Cues* Segment::GetCues() const
{
return m_pCues;
}
long long Segment::GetDuration() const
{
assert(m_pInfo);
return m_pInfo->GetDuration();
}
SegmentInfo::SegmentInfo(
Segment* pSegment,
long long start,
long long size_,
long long element_start,
long long element_size) :
m_pSegment(pSegment),
m_start(start),
m_size(size_),
m_pMuxingAppAsUTF8(NULL),
m_pWritingAppAsUTF8(NULL),
m_pTitleAsUTF8(NULL),
m_element_start(element_start),
m_element_size(element_size)
{
IMkvReader* const pReader = m_pSegment->m_pReader;
long long pos = start;
const long long stop = start + size_;
m_timecodeScale = 1000000;
m_duration = -1;
while (pos < stop)
{
if (Match(pReader, pos, 0x0AD7B1, m_timecodeScale))
assert(m_timecodeScale > 0);
else if (Match(pReader, pos, 0x0489, m_duration))
assert(m_duration >= 0);
else if (Match(pReader, pos, 0x0D80, m_pMuxingAppAsUTF8)) //[4D][80]
assert(m_pMuxingAppAsUTF8);
else if (Match(pReader, pos, 0x1741, m_pWritingAppAsUTF8)) //[57][41]
assert(m_pWritingAppAsUTF8);
else if (Match(pReader, pos, 0x3BA9, m_pTitleAsUTF8)) //[7B][A9]
assert(m_pTitleAsUTF8);
else
{
long len;
const long long id = ReadUInt(pReader, pos, len);
//id;
assert(id >= 0);
assert((pos + len) <= stop);
pos += len; //consume id
assert((stop - pos) > 0);
const long long size = ReadUInt(pReader, pos, len);
assert(size >= 0);
assert((pos + len) <= stop);
pos += len + size; //consume size and payload
assert(pos <= stop);
}
}
assert(pos == stop);
}
SegmentInfo::~SegmentInfo()
{
if (m_pMuxingAppAsUTF8)
{
delete[] m_pMuxingAppAsUTF8;
m_pMuxingAppAsUTF8 = NULL;
}
if (m_pWritingAppAsUTF8)
{
delete[] m_pWritingAppAsUTF8;
m_pWritingAppAsUTF8 = NULL;
}
if (m_pTitleAsUTF8)
{
delete[] m_pTitleAsUTF8;
m_pTitleAsUTF8 = NULL;
}
}
long long SegmentInfo::GetTimeCodeScale() const
{
return m_timecodeScale;
}
long long SegmentInfo::GetDuration() const
{
if (m_duration < 0)
return -1;
assert(m_timecodeScale >= 1);
const double dd = double(m_duration) * double(m_timecodeScale);
const long long d = static_cast<long long>(dd);
return d;
}
const char* SegmentInfo::GetMuxingAppAsUTF8() const
{
return m_pMuxingAppAsUTF8;
}
const char* SegmentInfo::GetWritingAppAsUTF8() const
{
return m_pWritingAppAsUTF8;
}
const char* SegmentInfo::GetTitleAsUTF8() const
{
return m_pTitleAsUTF8;
}
Track::Track(
Segment* pSegment,
const Info& i,
long long element_start,
long long element_size) :
m_pSegment(pSegment),
m_info(i),
m_element_start(element_start),
m_element_size(element_size)
{
}
Track::~Track()
{
Info& info = const_cast<Info&>(m_info);
info.Clear();
}
Track::Info::Info():
type(-1),
number(-1),
uid(ULLONG_MAX),
nameAsUTF8(NULL),
codecId(NULL),
codecPrivate(NULL),
codecPrivateSize(0),
codecNameAsUTF8(NULL)
{
}
void Track::Info::Clear()
{
delete[] nameAsUTF8;
nameAsUTF8 = NULL;
delete[] codecId;
codecId = NULL;
delete[] codecPrivate;
codecPrivate = NULL;
codecPrivateSize = 0;
delete[] codecNameAsUTF8;
codecNameAsUTF8 = NULL;
}
const BlockEntry* Track::GetEOS() const
{
return &m_eos;
}
long long Track::GetType() const
{
return m_info.type;
}
long long Track::GetNumber() const
{
return m_info.number;
}
unsigned long long Track::GetUid() const
{
return m_info.uid;
}
const char* Track::GetNameAsUTF8() const
{
return m_info.nameAsUTF8;
}
const char* Track::GetCodecNameAsUTF8() const
{
return m_info.codecNameAsUTF8;
}
const char* Track::GetCodecId() const
{
return m_info.codecId;
}
const unsigned char* Track::GetCodecPrivate(size_t& size) const
{
size = m_info.codecPrivateSize;
return m_info.codecPrivate;
}
bool Track::GetLacing() const
{
return m_info.lacing;
}
long Track::GetFirst(const BlockEntry*& pBlockEntry) const
{
const Cluster* pCluster = m_pSegment->GetFirst();
for (int i = 0; ; )
{
if (pCluster == NULL)
{
pBlockEntry = GetEOS();
return 1;
}
if (pCluster->EOS())
{
if (m_pSegment->Unparsed() <= 0) //all clusters have been loaded
{
pBlockEntry = GetEOS();
return 1;
}
pBlockEntry = 0;
return E_BUFFER_NOT_FULL;
}
pBlockEntry = pCluster->GetFirst();
if (pBlockEntry == 0) //empty cluster
{
pCluster = m_pSegment->GetNext(pCluster);
continue;
}
for (;;)
{
const Block* const pBlock = pBlockEntry->GetBlock();
assert(pBlock);
const long long tn = pBlock->GetTrackNumber();
if ((tn == m_info.number) && VetEntry(pBlockEntry))
return 0;
pBlockEntry = pCluster->GetNext(pBlockEntry);
if (pBlockEntry == 0)
break;
}
++i;
if (i >= 100)
break;
pCluster = m_pSegment->GetNext(pCluster);
}
//NOTE: if we get here, it means that we didn't find a block with
//a matching track number. We interpret that as an error (which
//might be too conservative).
pBlockEntry = GetEOS(); //so we can return a non-NULL value
return 1;
}
long Track::GetNext(
const BlockEntry* pCurrEntry,
const BlockEntry*& pNextEntry) const
{
assert(pCurrEntry);
assert(!pCurrEntry->EOS()); //?
const Block* const pCurrBlock = pCurrEntry->GetBlock();
assert(pCurrBlock->GetTrackNumber() == m_info.number);
const Cluster* pCluster = pCurrEntry->GetCluster();
assert(pCluster);
assert(!pCluster->EOS());
pNextEntry = pCluster->GetNext(pCurrEntry);
for (int i = 0; ; )
{
while (pNextEntry)
{
const Block* const pNextBlock = pNextEntry->GetBlock();
assert(pNextBlock);
if (pNextBlock->GetTrackNumber() == m_info.number)
return 0;
pNextEntry = pCluster->GetNext(pNextEntry);
}
pCluster = m_pSegment->GetNext(pCluster);
if (pCluster == NULL)
{
pNextEntry = GetEOS();
return 1;
}
if (pCluster->EOS())
{
if (m_pSegment->Unparsed() <= 0) //all clusters have been loaded
{
pNextEntry = GetEOS();
return 1;
}
//TODO: there is a potential O(n^2) problem here: we tell the
//caller to (pre)load another cluster, which he does, but then he
//calls GetNext again, which repeats the same search. This is
//a pathological case, since the only way it can happen is if
//there exists a long sequence of clusters none of which contain a
// block from this track. One way around this problem is for the
//caller to be smarter when he loads another cluster: don't call
//us back until you have a cluster that contains a block from this
//track. (Of course, that's not cheap either, since our caller
//would have to scan the each cluster as it's loaded, so that
//would just push back the problem.)
pNextEntry = NULL;
return E_BUFFER_NOT_FULL;
}
pNextEntry = pCluster->GetFirst();
if (pNextEntry == NULL) //empty cluster
continue;
++i;
if (i >= 100)
break;
}
//NOTE: if we get here, it means that we didn't find a block with
//a matching track number after lots of searching, so we give
//up trying.
pNextEntry = GetEOS(); //so we can return a non-NULL value
return 1;
}
Track::EOSBlock::EOSBlock()
{
}
bool Track::EOSBlock::EOS() const
{
return true;
}
const Cluster* Track::EOSBlock::GetCluster() const
{
return NULL;
}
size_t Track::EOSBlock::GetIndex() const
{
return 0;
}
const Block* Track::EOSBlock::GetBlock() const
{
return NULL;
}
bool Track::EOSBlock::IsBFrame() const
{
return false;
}
VideoTrack::VideoTrack(
Segment* pSegment,
const Info& i,
long long element_start,
long long element_size) :
Track(pSegment, i, element_start, element_size),
m_width(-1),
m_height(-1),
m_rate(-1)
{
assert(i.type == 1);
assert(i.number > 0);
IMkvReader* const pReader = pSegment->m_pReader;
const Settings& s = i.settings;
assert(s.start >= 0);
assert(s.size >= 0);
long long pos = s.start;
assert(pos >= 0);
const long long stop = pos + s.size;
while (pos < stop)
{
#ifdef _DEBUG
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0); //TODO: handle error case
assert((pos + len) <= stop);
#endif
if (Match(pReader, pos, 0x30, m_width))
;
else if (Match(pReader, pos, 0x3A, m_height))
;
else if (Match(pReader, pos, 0x0383E3, m_rate))
;
else
{
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0); //TODO: handle error case
assert((pos + len) <= stop);
pos += len; //consume id
const long long size = ReadUInt(pReader, pos, len);
assert(size >= 0); //TODO: handle error case
assert((pos + len) <= stop);
pos += len; //consume length of size
assert((pos + size) <= stop);
//pos now designates start of payload
pos += size; //consume payload
assert(pos <= stop);
}
}
return;
}
bool VideoTrack::VetEntry(const BlockEntry* pBlockEntry) const
{
assert(pBlockEntry);
const Block* const pBlock = pBlockEntry->GetBlock();
assert(pBlock);
assert(pBlock->GetTrackNumber() == m_info.number);
return pBlock->IsKey();
}
long VideoTrack::Seek(
long long time_ns,
const BlockEntry*& pResult) const
{
const long status = GetFirst(pResult);
if (status < 0) //buffer underflow, etc
return status;
assert(pResult);
if (pResult->EOS())
return 0;
const Cluster* pCluster = pResult->GetCluster();
assert(pCluster);
if (time_ns <= pResult->GetBlock()->GetTime(pCluster))
return 0;
Cluster** const clusters = m_pSegment->m_clusters;
assert(clusters);
const long count = m_pSegment->GetCount();
assert(count > 0);
Cluster** const i = clusters + pCluster->m_index;
assert(i);
assert(*i == pCluster);
assert(pCluster->GetTime() <= time_ns);
Cluster** const j = clusters + count;
Cluster** lo = i;
Cluster** hi = j;
while (lo < hi)
{
//INVARIANT:
//[i, lo) <= time_ns
//[lo, hi) ?
//[hi, j) > time_ns
Cluster** const mid = lo + (hi - lo) / 2;
assert(mid < hi);
pCluster = *mid;
assert(pCluster);
assert(pCluster->m_index == long(mid - m_pSegment->m_clusters));
const long long t = pCluster->GetTime();
if (t <= time_ns)
lo = mid + 1;
else
hi = mid;
assert(lo <= hi);
}
assert(lo == hi);
assert(lo > i);
assert(lo <= j);
pCluster = *--lo;
assert(pCluster);
assert(pCluster->GetTime() <= time_ns);
pResult = pCluster->GetEntry(this, time_ns);
if ((pResult != 0) && !pResult->EOS()) //found a keyframe
return 0;
while (lo != i)
{
pCluster = *--lo;
assert(pCluster);
assert(pCluster->GetTime() <= time_ns);
//TODO:
//We need to handle the case when a cluster
//contains multiple keyframes. Simply returning
//the largest keyframe on the cluster isn't
//good enough.
pResult = pCluster->GetMaxKey(this);
if ((pResult != 0) && !pResult->EOS())
return 0;
}
//weird: we're on the first cluster, but no keyframe found
//should never happen but we must return something anyway
pResult = GetEOS();
return 0;
}
long long VideoTrack::GetWidth() const
{
return m_width;
}
long long VideoTrack::GetHeight() const
{
return m_height;
}
double VideoTrack::GetFrameRate() const
{
return m_rate;
}
AudioTrack::AudioTrack(
Segment* pSegment,
const Info& i,
long long element_start,
long long element_size) :
Track(pSegment, i, element_start, element_size),
m_rate(0.0),
m_channels(0),
m_bitDepth(-1)
{
assert(i.type == 2);
assert(i.number > 0);
IMkvReader* const pReader = pSegment->m_pReader;
const Settings& s = i.settings;
assert(s.start >= 0);
assert(s.size >= 0);
long long pos = s.start;
assert(pos >= 0);
const long long stop = pos + s.size;
while (pos < stop)
{
#ifdef _DEBUG
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0); //TODO: handle error case
assert((pos + len) <= stop);
#endif
if (Match(pReader, pos, 0x35, m_rate))
;
else if (Match(pReader, pos, 0x1F, m_channels))
;
else if (Match(pReader, pos, 0x2264, m_bitDepth))
;
else
{
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0); //TODO: handle error case
assert((pos + len) <= stop);
pos += len; //consume id
const long long size = ReadUInt(pReader, pos, len);
assert(size >= 0); //TODO: handle error case
assert((pos + len) <= stop);
pos += len; //consume length of size
assert((pos + size) <= stop);
//pos now designates start of payload
pos += size; //consume payload
assert(pos <= stop);
}
}
return;
}
bool AudioTrack::VetEntry(const BlockEntry* pBlockEntry) const
{
assert(pBlockEntry);
const Block* const pBlock = pBlockEntry->GetBlock();
assert(pBlock);
assert(pBlock->GetTrackNumber() == m_info.number);
return true;
}
long AudioTrack::Seek(
long long time_ns,
const BlockEntry*& pResult) const
{
const long status = GetFirst(pResult);
if (status < 0) //buffer underflow, etc
return status;
assert(pResult);
if (pResult->EOS())
return 0;
const Cluster* pCluster = pResult->GetCluster();
assert(pCluster);
if (time_ns <= pResult->GetBlock()->GetTime(pCluster))
return 0;
Cluster** const clusters = m_pSegment->m_clusters;
assert(clusters);
const long count = m_pSegment->GetCount();
assert(count > 0);
Cluster** const i = clusters + pCluster->m_index;
assert(i);
assert(*i == pCluster);
assert(pCluster->GetTime() <= time_ns);
Cluster** const j = clusters + count;
Cluster** lo = i;
Cluster** hi = j;
while (lo < hi)
{
//INVARIANT:
//[i, lo) <= time_ns
//[lo, hi) ?
//[hi, j) > time_ns
Cluster** const mid = lo + (hi - lo) / 2;
assert(mid < hi);
pCluster = *mid;
assert(pCluster);
assert(pCluster->m_index == long(mid - m_pSegment->m_clusters));
const long long t = pCluster->GetTime();
if (t <= time_ns)
lo = mid + 1;
else
hi = mid;
assert(lo <= hi);
}
assert(lo == hi);
assert(lo > i);
assert(lo <= j);
while (lo > i)
{
pCluster = *--lo;
assert(pCluster);
assert(pCluster->GetTime() <= time_ns);
pResult = pCluster->GetEntry(this);
if ((pResult != 0) && !pResult->EOS())
return 0;
//landed on empty cluster (no entries)
}
pResult = GetEOS(); //weird
return 0;
}
double AudioTrack::GetSamplingRate() const
{
return m_rate;
}
long long AudioTrack::GetChannels() const
{
return m_channels;
}
long long AudioTrack::GetBitDepth() const
{
return m_bitDepth;
}
Tracks::Tracks(
Segment* pSegment,
long long start,
long long size_,
long long element_start,
long long element_size) :
m_pSegment(pSegment),
m_start(start),
m_size(size_),
m_trackEntries(NULL),
m_trackEntriesEnd(NULL),
m_element_start(element_start),
m_element_size(element_size)
{
long long stop = m_start + m_size;
IMkvReader* const pReader = m_pSegment->m_pReader;
long long pos1 = m_start;
int count = 0;
while (pos1 < stop)
{
long len;
const long long id = ReadUInt(pReader, pos1, len);
assert(id >= 0);
assert((pos1 + len) <= stop);
pos1 += len; //consume id
const long long size = ReadUInt(pReader, pos1, len);
assert(size >= 0);
assert((pos1 + len) <= stop);
pos1 += len; //consume length of size
//pos now desinates start of element
if (id == 0x2E) //TrackEntry ID
++count;
pos1 += size; //consume payload
assert(pos1 <= stop);
}
if (count <= 0)
return;
m_trackEntries = new Track*[count];
m_trackEntriesEnd = m_trackEntries;
long long pos = m_start;
while (pos < stop)
{
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0);
assert((pos + len) <= stop);
const long long element_start = pos;
pos += len; //consume id
const long long size1 = ReadUInt(pReader, pos, len);
assert(size1 >= 0);
assert((pos + len) <= stop);
pos += len; //consume length of size
//pos now desinates start of element
const long long element_size = size1 + pos - element_start;
if (id == 0x2E) //TrackEntry ID
{
Track*& pTrack = *m_trackEntriesEnd;
ParseTrackEntry(pos, size1, pTrack, element_start, element_size);
if (pTrack)
++m_trackEntriesEnd;
}
pos += size1; //consume payload
assert(pos <= stop);
}
}
unsigned long Tracks::GetTracksCount() const
{
const ptrdiff_t result = m_trackEntriesEnd - m_trackEntries;
assert(result >= 0);
return static_cast<unsigned long>(result);
}
void Tracks::ParseTrackEntry(
long long start,
long long size,
Track*& pTrack,
long long element_start,
long long element_size)
{
IMkvReader* const pReader = m_pSegment->m_pReader;
long long pos = start;
const long long stop = start + size;
Track::Info i;
Track::Settings videoSettings;
videoSettings.start = -1;
Track::Settings audioSettings;
audioSettings.start = -1;
long long lacing = 1; //default is true
while (pos < stop)
{
#ifdef _DEBUG
long len;
const long long id = ReadUInt(pReader, pos, len);
len;
id;
#endif
if (Match(pReader, pos, 0x57, i.number))
assert(i.number > 0);
//else if (Match(pReader, pos, 0x33C5, i.uid))
// ;
else if (Match(pReader, pos, 0x03, i.type))
;
else if (Match(pReader, pos, 0x136E, i.nameAsUTF8))
assert(i.nameAsUTF8);
else if (Match(pReader, pos, 0x06, i.codecId))
;
else if (Match(pReader, pos, 0x1C, lacing))
assert(lacing <= 1);
else if (Match(pReader,
pos,
0x23A2,
i.codecPrivate,
i.codecPrivateSize))
;
else if (Match(pReader, pos, 0x058688, i.codecNameAsUTF8))
assert(i.codecNameAsUTF8);
else
{
long len;
const long long idpos = pos;
idpos;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0); //TODO: handle error case
assert((pos + len) <= stop);
pos += len; //consume id
const long long size = ReadUInt(pReader, pos, len);
assert(size >= 0); //TODO: handle error case
assert((pos + len) <= stop);
pos += len; //consume length of size
const long long start = pos;
pos += size; //consume payload
assert(pos <= stop);
if (id == 0x60)
{
videoSettings.start = start;
videoSettings.size = size;
}
else if (id == 0x61)
{
audioSettings.start = start;
audioSettings.size = size;
}
else if (id == 0x33C5) //Track UID
{
assert(size <= 8);
i.uid = 0;
long long pos_ = start;
const long long pos_end = start + size;
while (pos_ != pos_end)
{
unsigned char b;
const long status = pReader->Read(pos_, 1, &b);
assert(status == 0);
i.uid <<= 8;
i.uid |= b;
++pos_;
}
}
}
}
assert(pos == stop);
//TODO: propertly vet info.number, to ensure both its existence,
//and that it is unique among all tracks.
assert(i.number > 0);
i.lacing = (lacing > 0) ? true : false;
//TODO: vet settings, to ensure that video settings (0x60)
//were specified when type = 1, and that audio settings (0x61)
//were specified when type = 2.
if (i.type == 1) //video
{
assert(audioSettings.start < 0);
assert(videoSettings.start >= 0);
i.settings = videoSettings;
VideoTrack* const t = new VideoTrack(
m_pSegment,
i,
element_start,
element_size);
assert(t); //TODO
pTrack = t;
}
else if (i.type == 2) //audio
{
assert(videoSettings.start < 0);
assert(audioSettings.start >= 0);
i.settings = audioSettings;
AudioTrack* const t = new AudioTrack(
m_pSegment,
i,
element_start,
element_size);
assert(t); //TODO
pTrack = t;
}
else
{
// for now we do not support other track types yet.
// TODO: support other track types
i.Clear();
pTrack = NULL;
}
return;
}
Tracks::~Tracks()
{
Track** i = m_trackEntries;
Track** const j = m_trackEntriesEnd;
while (i != j)
{
Track* const pTrack = *i++;
delete pTrack;
}
delete[] m_trackEntries;
}
const Track* Tracks::GetTrackByNumber(unsigned long tn_) const
{
const long long tn = tn_;
Track** i = m_trackEntries;
Track** const j = m_trackEntriesEnd;
while (i != j)
{
Track* const pTrack = *i++;
if (pTrack == NULL)
continue;
if (tn == pTrack->GetNumber())
return pTrack;
}
return NULL; //not found
}
const Track* Tracks::GetTrackByIndex(unsigned long idx) const
{
const ptrdiff_t count = m_trackEntriesEnd - m_trackEntries;
if (idx >= static_cast<unsigned long>(count))
return NULL;
return m_trackEntries[idx];
}
void Cluster::Load() const
{
assert(m_pSegment);
assert(m_pos);
assert(m_size);
if (m_pos > 0) //loaded
{
assert(m_size > 0);
assert(m_timecode >= 0);
return;
}
assert(m_pos < 0); //not loaded yet
assert(m_size < 0);
assert(m_timecode < 0);
IMkvReader* const pReader = m_pSegment->m_pReader;
m_pos *= -1; //relative to segment
long long pos = m_pSegment->m_start + m_pos; //absolute
long len;
const long long id_ = ReadUInt(pReader, pos, len);
assert(id_ >= 0);
assert(id_ == 0x0F43B675); //Cluster ID
pos += len; //consume id
const long long size_ = ReadUInt(pReader, pos, len);
assert(size_ >= 0);
pos += len; //consume size
m_size = size_;
const long long stop = pos + size_;
long long timecode = -1;
while (pos < stop)
{
if (Match(pReader, pos, 0x67, timecode))
break;
else
{
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0); //TODO
assert((pos + len) <= stop);
pos += len; //consume id
const long long size = ReadUInt(pReader, pos, len);
assert(size >= 0); //TODO
assert((pos + len) <= stop);
pos += len; //consume size
if (id == 0x20) //BlockGroup ID
break;
if (id == 0x23) //SimpleBlock ID
break;
pos += size; //consume payload
assert(pos <= stop);
}
}
assert(pos <= stop);
assert(timecode >= 0);
m_timecode = timecode;
}
Cluster* Cluster::Parse(
Segment* pSegment,
long idx,
long long off,
long long element_start,
long long element_size)
{
assert(pSegment);
assert(off >= 0);
assert(off < pSegment->m_size);
//if (!HasBlockEntries(pSegment, off))
// return NULL;
Cluster* const pCluster = new Cluster(pSegment,
idx,
-off,
element_start,
element_size);
assert(pCluster);
return pCluster;
}
Cluster::Cluster() :
m_pSegment(NULL),
m_index(0),
m_pos(0),
m_size(0),
m_element_start(0),
m_element_size(0),
m_timecode(0),
m_entries(NULL),
m_entries_count(0) //means "no entries"
{
}
Cluster::Cluster(
Segment* pSegment,
long idx,
long long off,
long long element_start,
long long element_size) :
m_pSegment(pSegment),
m_index(idx),
m_pos(off),
m_element_start(element_start),
m_element_size(element_size),
m_size(-1),
m_timecode(-1),
m_entries(NULL),
m_entries_count(-1) //means "has not been parsed yet"
{
}
Cluster::~Cluster()
{
if (m_entries_count <= 0)
return;
BlockEntry** i = m_entries;
BlockEntry** const j = m_entries + m_entries_count;
while (i != j)
{
BlockEntry* p = *i++;
assert(p);
delete p;
}
delete[] m_entries;
}
bool Cluster::EOS() const
{
return (m_pSegment == NULL);
}
bool Cluster::HasBlockEntries(
const Segment* pSegment,
long long off) //relative to start of segment payload
{
assert(pSegment);
assert(off >= 0); //relative to segment
IMkvReader* const pReader = pSegment->m_pReader;
long long pos = pSegment->m_start + off; //absolute
long long size;
{
long len;
const long long id = ReadUInt(pReader, pos, len);
id;
assert(id >= 0);
assert(id == 0x0F43B675); //Cluster ID
pos += len; //consume id
size = ReadUInt(pReader, pos, len);
assert(size > 0);
pos += len; //consume size
//pos now points to start of payload
}
const long long stop = pos + size;
while (pos < stop)
{
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0); //TODO
assert((pos + len) <= stop);
pos += len; //consume id
const long long size = ReadUInt(pReader, pos, len);
assert(size >= 0); //TODO
assert((pos + len) <= stop);
pos += len; //consume size
if (id == 0x20) //BlockGroup ID
return true;
if (id == 0x23) //SimpleBlock ID
return true;
pos += size; //consume payload
assert(pos <= stop);
}
return false;
}
void Cluster::LoadBlockEntries() const
{
if (m_entries)
return;
if (m_entries_count == 0) //already parsed, and no entries found
return;
assert(m_pSegment);
assert(m_pos);
assert(m_size);
assert(m_entries_count < 0);
IMkvReader* const pReader = m_pSegment->m_pReader;
if (m_pos < 0)
m_pos *= -1; //relative to segment
long long pos = m_pSegment->m_start + m_pos; //absolute
{
long len;
const long long id = ReadUInt(pReader, pos, len);
id;
assert(id >= 0);
assert(id == 0x0F43B675); //Cluster ID
pos += len; //consume id
const long long size = ReadUInt(pReader, pos, len);
assert(size > 0);
pos += len; //consume size
//pos now points to start of payload
if (m_size >= 0)
assert(size == m_size);
else
m_size = size;
}
const long long stop = pos + m_size;
long long timecode = -1; //of cluster itself
//First count the number of entries
long long idx = pos; //points to start of payload
m_entries_count = 0;
while (idx < stop)
{
if (Match(pReader, idx, 0x67, timecode))
{
if (m_timecode >= 0)
assert(timecode == m_timecode);
else
m_timecode = timecode;
}
else
{
long len;
const long long id = ReadUInt(pReader, idx, len);
assert(id >= 0); //TODO
assert((idx + len) <= stop);
idx += len; //consume id
const long long size = ReadUInt(pReader, idx, len);
assert(size >= 0); //TODO
assert((idx + len) <= stop);
idx += len; //consume size
if (id == 0x20) //BlockGroup ID
++m_entries_count;
else if (id == 0x23) //SimpleBlock ID
++m_entries_count;
idx += size; //consume payload
assert(idx <= stop);
}
}
assert(idx == stop);
assert(m_timecode >= 0);
if (m_entries_count == 0)
return;
m_entries = new BlockEntry*[m_entries_count];
long index = 0;
while (pos < stop)
{
if (Match(pReader, pos, 0x67, timecode))
assert(timecode == m_timecode);
else
{
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0); //TODO
assert((pos + len) <= stop);
pos += len; //consume id
const long long size = ReadUInt(pReader, pos, len);
assert(size >= 0); //TODO
assert((pos + len) <= stop);
pos += len; //consume size
if (id == 0x20) //BlockGroup ID
ParseBlockGroup(pos, size, index++);
else if (id == 0x23) //SimpleBlock ID
ParseSimpleBlock(pos, size, index++);
pos += size; //consume payload
assert(pos <= stop);
}
}
assert(pos == stop);
assert(timecode >= 0);
assert(index == m_entries_count);
}
long long Cluster::GetTimeCode() const
{
Load();
return m_timecode;
}
long long Cluster::GetTime() const
{
const long long tc = GetTimeCode();
assert(tc >= 0);
const SegmentInfo* const pInfo = m_pSegment->GetInfo();
assert(pInfo);
const long long scale = pInfo->GetTimeCodeScale();
assert(scale >= 1);
const long long t = m_timecode * scale;
return t;
}
long long Cluster::GetFirstTime() const
{
const BlockEntry* const pEntry = GetFirst();
if (pEntry == NULL) //empty cluster
return GetTime();
const Block* const pBlock = pEntry->GetBlock();
assert(pBlock);
return pBlock->GetTime(this);
}
long long Cluster::GetLastTime() const
{
const BlockEntry* const pEntry = GetLast();
if (pEntry == NULL) //empty cluster
return GetTime();
const Block* const pBlock = pEntry->GetBlock();
assert(pBlock);
return pBlock->GetTime(this);
}
void Cluster::ParseBlockGroup(long long st, long long sz, size_t idx) const
{
assert(m_entries != NULL);
assert(m_entries_count > 0);
assert(idx < size_t(m_entries_count));
Cluster* const this_ = const_cast<Cluster*>(this);
BlockGroup* const e = new (std::nothrow) BlockGroup(this_, idx, st, sz);
assert(e); //TODO
m_entries[idx] = e;
}
void Cluster::ParseSimpleBlock(long long st, long long sz, size_t idx) const
{
assert(m_entries != NULL);
assert(m_entries_count > 0);
assert(idx < size_t(m_entries_count));
Cluster* const this_ = const_cast<Cluster*>(this);
SimpleBlock* const e = new (std::nothrow) SimpleBlock(this_, idx, st, sz);
assert(e); //TODO
m_entries[idx] = e;
}
const BlockEntry* Cluster::GetFirst() const
{
LoadBlockEntries();
if ((m_entries == NULL) || (m_entries_count <= 0))
return NULL;
const BlockEntry* const pFirst = m_entries[0];
assert(pFirst);
return pFirst;
}
const BlockEntry* Cluster::GetLast() const
{
LoadBlockEntries();
if ((m_entries == NULL) || (m_entries_count <= 0))
return NULL;
const long idx = m_entries_count - 1;
const BlockEntry* const pLast = m_entries[idx];
assert(pLast);
return pLast;
}
const BlockEntry* Cluster::GetNext(const BlockEntry* pEntry) const
{
assert(pEntry);
assert(m_entries != NULL);
assert(m_entries_count > 0);
size_t idx = pEntry->GetIndex();
assert(idx < size_t(m_entries_count));
assert(m_entries[idx] == pEntry);
++idx;
if (idx >= size_t(m_entries_count))
return NULL;
return m_entries[idx];
}
const BlockEntry* Cluster::GetEntry(
const Track* pTrack,
long long time_ns) const
{
assert(pTrack);
if (m_pSegment == NULL) //this is the special EOS cluster
return pTrack->GetEOS();
LoadBlockEntries();
if ((m_entries == NULL) || (m_entries_count <= 0))
return NULL; //return EOS here?
const BlockEntry* pResult = pTrack->GetEOS();
BlockEntry** i = m_entries;
assert(i);
BlockEntry** const j = i + m_entries_count;
while (i != j)
{
const BlockEntry* const pEntry = *i++;
assert(pEntry);
assert(!pEntry->EOS());
const Block* const pBlock = pEntry->GetBlock();
assert(pBlock);
if (pBlock->GetTrackNumber() != pTrack->GetNumber())
continue;
if (pTrack->VetEntry(pEntry))
{
if (time_ns < 0) //just want first candidate block
return pEntry;
const long long ns = pBlock->GetTime(this);
if (ns > time_ns)
break;
pResult = pEntry;
}
else if (time_ns >= 0)
{
const long long ns = pBlock->GetTime(this);
if (ns > time_ns)
break;
}
}
return pResult;
}
const BlockEntry*
Cluster::GetEntry(
const CuePoint& cp,
const CuePoint::TrackPosition& tp) const
{
assert(m_pSegment);
LoadBlockEntries();
if (m_entries == NULL)
return NULL;
const long long count = m_entries_count;
if (count <= 0)
return NULL;
const long long tc = cp.GetTimeCode();
if ((tp.m_block > 0) && (tp.m_block <= count))
{
const size_t block = static_cast<size_t>(tp.m_block);
const size_t index = block - 1;
const BlockEntry* const pEntry = m_entries[index];
assert(pEntry);
assert(!pEntry->EOS());
const Block* const pBlock = pEntry->GetBlock();
assert(pBlock);
if ((pBlock->GetTrackNumber() == tp.m_track) &&
(pBlock->GetTimeCode(this) == tc))
{
return pEntry;
}
}
const BlockEntry* const* i = m_entries;
const BlockEntry* const* const j = i + count;
while (i != j)
{
#ifdef _DEBUG
const ptrdiff_t idx = i - m_entries;
idx;
#endif
const BlockEntry* const pEntry = *i++;
assert(pEntry);
assert(!pEntry->EOS());
const Block* const pBlock = pEntry->GetBlock();
assert(pBlock);
if (pBlock->GetTrackNumber() != tp.m_track)
continue;
const long long tc_ = pBlock->GetTimeCode(this);
if (tc_ < tc)
continue;
if (tc_ > tc)
return NULL;
const Tracks* const pTracks = m_pSegment->GetTracks();
assert(pTracks);
const long tn = static_cast<long>(tp.m_track);
const Track* const pTrack = pTracks->GetTrackByNumber(tn);
if (pTrack == NULL)
return NULL;
const long long type = pTrack->GetType();
if (type == 2) //audio
return pEntry;
if (type != 1) //not video
return NULL;
if (!pBlock->IsKey())
return NULL;
return pEntry;
}
return NULL;
}
const BlockEntry* Cluster::GetMaxKey(const VideoTrack* pTrack) const
{
assert(pTrack);
if (m_pSegment == NULL) //EOS
return pTrack->GetEOS();
LoadBlockEntries();
if ((m_entries == NULL) || (m_entries_count <= 0))
return pTrack->GetEOS();
BlockEntry** i = m_entries + m_entries_count;
BlockEntry** const j = m_entries;
while (i != j)
{
const BlockEntry* const pEntry = *--i;
assert(pEntry);
assert(!pEntry->EOS());
const Block* const pBlock = pEntry->GetBlock();
assert(pBlock);
if (pBlock->GetTrackNumber() != pTrack->GetNumber())
continue;
if (pBlock->IsKey())
return pEntry;
}
return pTrack->GetEOS(); //no satisfactory block found
}
BlockEntry::BlockEntry()
{
}
BlockEntry::~BlockEntry()
{
}
SimpleBlock::SimpleBlock(
Cluster* pCluster,
size_t idx,
long long start,
long long size) :
m_pCluster(pCluster),
m_index(idx),
m_block(start, size, pCluster->m_pSegment->m_pReader)
{
}
bool SimpleBlock::EOS() const
{
return false;
}
const Cluster* SimpleBlock::GetCluster() const
{
return m_pCluster;
}
size_t SimpleBlock::GetIndex() const
{
return m_index;
}
const Block* SimpleBlock::GetBlock() const
{
return &m_block;
}
//bool SimpleBlock::IsBFrame() const
//{
// return false;
//}
BlockGroup::BlockGroup(
Cluster* pCluster,
size_t idx,
long long start,
long long size_) :
m_pCluster(pCluster),
m_index(idx),
m_prevTimeCode(0),
m_nextTimeCode(0),
m_pBlock(NULL) //TODO: accept multiple blocks within a block group
{
IMkvReader* const pReader = m_pCluster->m_pSegment->m_pReader;
long long pos = start;
const long long stop = start + size_;
bool bSimpleBlock = false;
bool bReferenceBlock = false;
while (pos < stop)
{
short t;
if (Match(pReader, pos, 0x7B, t))
{
if (t < 0)
m_prevTimeCode = t;
else if (t > 0)
m_nextTimeCode = t;
else
assert(false);
bReferenceBlock = true;
}
else
{
long len;
const long long id = ReadUInt(pReader, pos, len);
assert(id >= 0); //TODO
assert((pos + len) <= stop);
pos += len; //consume ID
const long long size = ReadUInt(pReader, pos, len);
assert(size >= 0); //TODO
assert((pos + len) <= stop);
pos += len; //consume size
switch (id)
{
case 0x23: //SimpleBlock ID
bSimpleBlock = true;
//YES, FALL THROUGH TO NEXT CASE
case 0x21: //Block ID
ParseBlock(pos, size);
break;
default:
break;
}
pos += size; //consume payload
assert(pos <= stop);
}
}
assert(pos == stop);
assert(m_pBlock);
if (!bSimpleBlock)
m_pBlock->SetKey(!bReferenceBlock);
}
BlockGroup::~BlockGroup()
{
delete m_pBlock;
}
void BlockGroup::ParseBlock(long long start, long long size)
{
IMkvReader* const pReader = m_pCluster->m_pSegment->m_pReader;
Block* const pBlock = new Block(start, size, pReader);
assert(pBlock); //TODO
//TODO: the Matroska spec says you have multiple blocks within the
//same block group, with blocks ranked by priority (the flag bits).
assert(m_pBlock == NULL);
m_pBlock = pBlock;
}
bool BlockGroup::EOS() const
{
return false;
}
const Cluster* BlockGroup::GetCluster() const
{
return m_pCluster;
}
size_t BlockGroup::GetIndex() const
{
return m_index;
}
const Block* BlockGroup::GetBlock() const
{
return m_pBlock;
}
short BlockGroup::GetPrevTimeCode() const
{
return m_prevTimeCode;
}
short BlockGroup::GetNextTimeCode() const
{
return m_nextTimeCode;
}
//bool BlockGroup::IsBFrame() const
//{
// return (m_nextTimeCode > 0);
//}
Block::Block(long long start, long long size_, IMkvReader* pReader) :
m_start(start),
m_size(size_)
{
long long pos = start;
const long long stop = start + size_;
long len;
m_track = ReadUInt(pReader, pos, len);
assert(m_track > 0);
assert((pos + len) <= stop);
pos += len; //consume track number
assert((stop - pos) >= 2);
m_timecode = Unserialize2SInt(pReader, pos);
pos += 2;
assert((stop - pos) >= 1);
long status = pReader->Read(pos, 1, &m_flags);
assert(status == 0);
#if 0
const int invisible = int(m_flags & 0x08) >> 3;
invisible;
assert(!invisible); //TODO
#endif
const int lacing = int(m_flags & 0x06) >> 1;
++pos; //consume flags byte
assert(pos <= stop);
if (lacing == 0) //no lacing
{
m_frame_count = 1;
m_frames = new Frame[m_frame_count];
Frame& f = m_frames[0];
f.pos = pos;
const long long frame_size = stop - pos;
assert(frame_size <= LONG_MAX);
f.len = static_cast<long>(frame_size);
return;
}
assert(pos < stop);
unsigned char count;
status = pReader->Read(pos, 1, &count);
assert(status == 0);
++pos; //consume frame count
assert(pos <= stop);
m_frame_count = ++count;
m_frames = new Frame[m_frame_count];
if (lacing == 1) //Xiph
{
Frame* pf = m_frames;
Frame* const pf_end = pf + m_frame_count;
long size = 0;
while (count > 1)
{
long frame_size = 0;
for (;;)
{
unsigned char val;
status = pReader->Read(pos, 1, &val);
assert(status == 0);
++pos; //consume xiph size byte
frame_size += val;
if (val < 255)
break;
}
Frame& f = *pf++;
assert(pf < pf_end);
f.len = frame_size;
size += frame_size; //contribution of this frame
--count;
}
assert(pf < pf_end);
assert(pos < stop);
{
Frame& f = *pf++;
assert(pf == pf_end);
const long long total_size = stop - pos;
assert(total_size > size);
const long long frame_size = total_size - size;
assert(frame_size <= LONG_MAX);
f.len = static_cast<long>(frame_size);
}
pf = m_frames;
while (pf != pf_end)
{
Frame& f = *pf++;
assert((pos + f.len) <= stop);
f.pos = pos;
pos += f.len;
}
assert(pos == stop);
}
else if (lacing == 2) //fixed-size lacing
{
const long long total_size = stop - pos;
assert((total_size % m_frame_count) == 0);
const long long frame_size = total_size / m_frame_count;
assert(frame_size <= LONG_MAX);
Frame* pf = m_frames;
Frame* const pf_end = pf + m_frame_count;
while (pf != pf_end)
{
assert((pos + frame_size) <= stop);
Frame& f = *pf++;
f.pos = pos;
f.len = static_cast<long>(frame_size);
pos += frame_size;
}
assert(pos == stop);
}
else
{
assert(lacing == 3); //EBML lacing
assert(pos < stop);
long size = 0;
long long frame_size = ReadUInt(pReader, pos, len);
assert(frame_size > 0);
assert(frame_size <= LONG_MAX);
assert((pos + len) <= stop);
pos += len; //consume length of size of first frame
assert((pos + frame_size) <= stop);
Frame* pf = m_frames;
Frame* const pf_end = pf + m_frame_count;
{
Frame& curr = *pf;
curr.len = static_cast<long>(frame_size);
size += curr.len; //contribution of this frame
}
--count;
while (count > 1)
{
assert(pos < stop);
assert(pf < pf_end);
const Frame& prev = *pf++;
assert(pf < pf_end);
assert(prev.len == frame_size);
Frame& curr = *pf;
const long long delta_size_ = ReadUInt(pReader, pos, len);
assert(delta_size_ >= 0);
assert((pos + len) <= stop);
pos += len; //consume length of (delta) size
assert(pos <= stop);
const int exp = 7*len - 1;
const long long bias = (1LL << exp) - 1LL;
const long long delta_size = delta_size_ - bias;
frame_size += delta_size;
assert(frame_size > 0);
assert(frame_size <= LONG_MAX);
curr.len = static_cast<long>(frame_size);
size += curr.len; //contribution of this frame
--count;
}
{
assert(pos < stop);
assert(pf < pf_end);
const Frame& prev = *pf++;
assert(pf < pf_end);
assert(prev.len == frame_size);
Frame& curr = *pf++;
assert(pf == pf_end);
const long long total_size = stop - pos;
assert(total_size > 0);
assert(total_size > size);
frame_size = total_size - size;
assert(frame_size > 0);
assert(frame_size <= LONG_MAX);
curr.len = static_cast<long>(frame_size);
}
pf = m_frames;
while (pf != pf_end)
{
Frame& f = *pf++;
assert((pos + f.len) <= stop);
f.pos = pos;
pos += f.len;
}
assert(pos == stop);
}
}
Block::~Block()
{
delete[] m_frames;
}
long long Block::GetTimeCode(const Cluster* pCluster) const
{
assert(pCluster);
const long long tc0 = pCluster->GetTimeCode();
assert(tc0 >= 0);
const long long tc = tc0 + static_cast<long long>(m_timecode);
assert(tc >= 0);
return tc; //unscaled timecode units
}
long long Block::GetTime(const Cluster* pCluster) const
{
assert(pCluster);
const long long tc = GetTimeCode(pCluster);
const Segment* const pSegment = pCluster->m_pSegment;
const SegmentInfo* const pInfo = pSegment->GetInfo();
assert(pInfo);
const long long scale = pInfo->GetTimeCodeScale();
assert(scale >= 1);
const long long ns = tc * scale;
return ns;
}
long long Block::GetTrackNumber() const
{
return m_track;
}
bool Block::IsKey() const
{
return ((m_flags & static_cast<unsigned char>(1 << 7)) != 0);
}
void Block::SetKey(bool bKey)
{
if (bKey)
m_flags |= static_cast<unsigned char>(1 << 7);
else
m_flags &= 0x7F;
}
bool Block::IsInvisible() const
{
return bool(int(m_flags & 0x08) != 0);
}
int Block::GetFrameCount() const
{
return m_frame_count;
}
const Block::Frame& Block::GetFrame(int idx) const
{
assert(idx >= 0);
assert(idx < m_frame_count);
const Frame& f = m_frames[idx];
assert(f.pos > 0);
assert(f.len > 0);
return f;
}
long Block::Frame::Read(IMkvReader* pReader, unsigned char* buf) const
{
assert(pReader);
assert(buf);
const long status = pReader->Read(pos, len, buf);
return status;
}
} //end namespace mkvparser
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