591 lines
20 KiB
C
591 lines
20 KiB
C
/*
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* Matroska file muxer
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* Copyright (c) 2007 David Conrad
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "riff.h"
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#include "xiph.h"
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#include "matroska.h"
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typedef struct mkv_seekhead_entry {
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unsigned int elementid;
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uint64_t segmentpos;
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} mkv_seekhead_entry;
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typedef struct mkv_seekhead {
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offset_t filepos;
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offset_t segment_offset; ///< the file offset to the beginning of the segment
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int reserved_size; ///< -1 if appending to file
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int max_entries;
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mkv_seekhead_entry *entries;
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int num_entries;
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} mkv_seekhead;
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typedef struct {
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uint64_t pts;
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int tracknum;
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offset_t cluster_pos; ///< file offset of the cluster containing the block
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} mkv_cuepoint;
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typedef struct {
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offset_t segment_offset;
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mkv_cuepoint *entries;
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int num_entries;
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} mkv_cues;
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typedef struct MatroskaMuxContext {
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offset_t segment;
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offset_t segment_offset;
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offset_t cluster;
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offset_t cluster_pos; ///< file offset of the current cluster
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uint64_t cluster_pts;
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offset_t duration_offset;
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uint64_t duration;
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mkv_seekhead *main_seekhead;
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mkv_seekhead *cluster_seekhead;
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mkv_cues *cues;
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} MatroskaMuxContext;
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static void put_ebml_id(ByteIOContext *pb, unsigned int id)
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{
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if (id >= 0x3fffff)
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put_byte(pb, id >> 24);
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if (id >= 0x7fff)
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put_byte(pb, id >> 16);
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if (id >= 0xff)
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put_byte(pb, id >> 8);
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put_byte(pb, id);
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}
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static int ebml_id_size(unsigned int id)
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{
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return (av_log2(id+1)-1)/7+1;
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}
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// XXX: test this thoroughly and get rid of minbytes hack (currently needed to
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// use up all of the space reserved in start_ebml_master)
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static void put_ebml_size(ByteIOContext *pb, uint64_t size, int minbytes)
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{
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int bytes = minbytes;
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// sizes larger than this are currently undefined in EBML
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// so write "unknown" size
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size = FFMIN(size, (1ULL<<56)-1);
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while (size >> (bytes*7 + 7)) bytes++;
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put_byte(pb, (0x80 >> bytes) | (size >> bytes*8));
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for (bytes -= 1; bytes >= 0; bytes--)
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put_byte(pb, size >> bytes*8);
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}
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static void put_ebml_uint(ByteIOContext *pb, unsigned int elementid, uint64_t val)
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{
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int bytes = 1;
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while (val >> bytes*8) bytes++;
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put_ebml_id(pb, elementid);
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put_ebml_size(pb, bytes, 0);
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for (bytes -= 1; bytes >= 0; bytes--)
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put_byte(pb, val >> bytes*8);
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}
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static void put_ebml_float(ByteIOContext *pb, unsigned int elementid, double val)
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{
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// XXX: single-precision floats?
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put_ebml_id(pb, elementid);
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put_ebml_size(pb, 8, 0);
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put_be64(pb, av_dbl2int(val));
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}
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static void put_ebml_binary(ByteIOContext *pb, unsigned int elementid,
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const uint8_t *buf, int size)
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{
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put_ebml_id(pb, elementid);
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put_ebml_size(pb, size, 0);
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put_buffer(pb, buf, size);
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}
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static void put_ebml_string(ByteIOContext *pb, unsigned int elementid, const char *str)
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{
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put_ebml_binary(pb, elementid, str, strlen(str));
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}
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// this reserves exactly the amount of space specified by size, which must be at least 2
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static void put_ebml_void(ByteIOContext *pb, uint64_t size)
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{
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offset_t currentpos = url_ftell(pb);
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if (size < 2)
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return;
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put_ebml_id(pb, EBML_ID_VOID);
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// we need to subtract the length needed to store the size from the size we need to reserve
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// so 2 cases, we use 8 bytes to store the size if possible, 1 byte otherwise
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if (size < 10)
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put_ebml_size(pb, size-1, 0);
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else
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put_ebml_size(pb, size-9, 7);
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url_fseek(pb, currentpos + size, SEEK_SET);
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}
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static offset_t start_ebml_master(ByteIOContext *pb, unsigned int elementid)
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{
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put_ebml_id(pb, elementid);
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// XXX: this always reserves the maximum needed space to store any size value
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// we should be smarter (additional parameter for expected size?)
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put_ebml_size(pb, (1ULL<<56)-1, 0); // largest unknown size
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return url_ftell(pb);
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}
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static void end_ebml_master(ByteIOContext *pb, offset_t start)
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{
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offset_t pos = url_ftell(pb);
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url_fseek(pb, start - 8, SEEK_SET);
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put_ebml_size(pb, pos - start, 7);
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url_fseek(pb, pos, SEEK_SET);
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}
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// initializes a mkv_seekhead element to be ready to index level 1 matroska elements
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// if numelements is greater than 0, it reserves enough space for that many elements
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// at the current file position and writes the seekhead there, otherwise the seekhead
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// will be appended to the file when end_mkv_seekhead() is called
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static mkv_seekhead * mkv_start_seekhead(ByteIOContext *pb, offset_t segment_offset, int numelements)
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{
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mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
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if (new_seekhead == NULL)
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return NULL;
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new_seekhead->segment_offset = segment_offset;
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if (numelements > 0) {
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new_seekhead->filepos = url_ftell(pb);
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// 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID and size,
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// and 3 bytes to guarantee that an EBML void element will fit afterwards
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// XXX: 28 bytes right now because begin_ebml_master() reserves more than necessary
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new_seekhead->reserved_size = numelements * 28 + 13;
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new_seekhead->max_entries = numelements;
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put_ebml_void(pb, new_seekhead->reserved_size);
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}
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return new_seekhead;
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}
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static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
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{
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mkv_seekhead_entry *entries = seekhead->entries;
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int new_entry = seekhead->num_entries;
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// don't store more elements than we reserved space for
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if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
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return -1;
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entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
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if (entries == NULL)
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return -1;
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entries[new_entry].elementid = elementid;
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entries[new_entry].segmentpos = filepos - seekhead->segment_offset;
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seekhead->entries = entries;
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seekhead->num_entries++;
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return 0;
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}
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// returns the file offset where the seekhead was written and frees the seekhead
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static offset_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *seekhead)
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{
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offset_t metaseek, seekentry, currentpos;
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int i;
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currentpos = url_ftell(pb);
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if (seekhead->reserved_size > 0)
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url_fseek(pb, seekhead->filepos, SEEK_SET);
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metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD);
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for (i = 0; i < seekhead->num_entries; i++) {
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mkv_seekhead_entry *entry = &seekhead->entries[i];
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seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY);
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put_ebml_id(pb, MATROSKA_ID_SEEKID);
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put_ebml_size(pb, ebml_id_size(entry->elementid), 0);
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put_ebml_id(pb, entry->elementid);
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put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
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end_ebml_master(pb, seekentry);
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}
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end_ebml_master(pb, metaseek);
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if (seekhead->reserved_size > 0) {
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uint64_t remaining = seekhead->filepos + seekhead->reserved_size - url_ftell(pb);
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put_ebml_void(pb, remaining);
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url_fseek(pb, currentpos, SEEK_SET);
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currentpos = seekhead->filepos;
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}
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av_free(seekhead->entries);
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av_free(seekhead);
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return currentpos;
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}
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static mkv_cues * mkv_start_cues(offset_t segment_offset)
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{
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mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
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if (cues == NULL)
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return NULL;
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cues->segment_offset = segment_offset;
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return cues;
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}
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static int mkv_add_cuepoint(mkv_cues *cues, AVPacket *pkt, offset_t cluster_pos)
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{
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mkv_cuepoint *entries = cues->entries;
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int new_entry = cues->num_entries;
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entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
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if (entries == NULL)
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return -1;
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entries[new_entry].pts = pkt->pts;
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entries[new_entry].tracknum = pkt->stream_index + 1;
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entries[new_entry].cluster_pos = cluster_pos - cues->segment_offset;
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cues->entries = entries;
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cues->num_entries++;
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return 0;
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}
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static offset_t mkv_write_cues(ByteIOContext *pb, mkv_cues *cues)
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{
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offset_t currentpos, cues_element;
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int i, j;
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currentpos = url_ftell(pb);
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cues_element = start_ebml_master(pb, MATROSKA_ID_CUES);
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for (i = 0; i < cues->num_entries; i++) {
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offset_t cuepoint, track_positions;
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mkv_cuepoint *entry = &cues->entries[i];
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uint64_t pts = entry->pts;
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cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY);
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put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
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// put all the entries from different tracks that have the exact same
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// timestamp into the same CuePoint
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for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
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track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION);
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put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
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put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
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end_ebml_master(pb, track_positions);
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}
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i += j - 1;
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end_ebml_master(pb, cuepoint);
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}
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end_ebml_master(pb, cues_element);
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av_free(cues->entries);
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av_free(cues);
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return currentpos;
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}
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static int put_xiph_codecpriv(ByteIOContext *pb, AVCodecContext *codec)
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{
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offset_t codecprivate;
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uint8_t *header_start[3];
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int header_len[3];
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int first_header_size;
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int j, k;
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if (codec->codec_id == CODEC_ID_VORBIS)
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first_header_size = 30;
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else
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first_header_size = 42;
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if (ff_split_xiph_headers(codec->extradata, codec->extradata_size,
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first_header_size, header_start, header_len) < 0) {
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av_log(codec, AV_LOG_ERROR, "Extradata corrupt.\n");
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return -1;
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}
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codecprivate = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE);
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put_byte(pb, 2); // number packets - 1
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for (j = 0; j < 2; j++) {
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for (k = 0; k < header_len[j] / 255; k++)
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put_byte(pb, 255);
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put_byte(pb, header_len[j] % 255);
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}
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for (j = 0; j < 3; j++)
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put_buffer(pb, header_start[j], header_len[j]);
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end_ebml_master(pb, codecprivate);
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return 0;
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}
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static int mkv_write_tracks(AVFormatContext *s)
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{
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MatroskaMuxContext *mkv = s->priv_data;
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ByteIOContext *pb = &s->pb;
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offset_t tracks;
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int i, j;
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if (mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, url_ftell(pb)) < 0)
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return -1;
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tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS);
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for (i = 0; i < s->nb_streams; i++) {
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AVStream *st = s->streams[i];
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AVCodecContext *codec = st->codec;
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offset_t subinfo, track;
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int native_id = 0;
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int bit_depth = av_get_bits_per_sample(codec->codec_id);
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track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY);
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put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
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put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
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put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
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if (st->language[0])
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put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, st->language);
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// look for a codec id string specific to mkv to use, if none are found, use AVI codes
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for (j = 0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++) {
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if (ff_mkv_codec_tags[j].id == codec->codec_id) {
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put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
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native_id = 1;
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break;
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}
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}
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// XXX: CodecPrivate for vorbis, theora, aac, native mpeg4, ...
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if (native_id) {
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if (codec->codec_id == CODEC_ID_VORBIS || codec->codec_id == CODEC_ID_THEORA) {
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if (put_xiph_codecpriv(pb, codec) < 0)
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return -1;
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} else {
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put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codec->extradata, codec->extradata_size);
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}
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}
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switch (codec->codec_type) {
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case CODEC_TYPE_VIDEO:
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put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
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if (!native_id) {
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offset_t bmp_header;
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// if there is no mkv-specific codec id, use VFW mode
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if (!codec->codec_tag)
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codec->codec_tag = codec_get_tag(codec_bmp_tags, codec->codec_id);
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put_ebml_string(pb, MATROSKA_ID_CODECID, MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC);
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// XXX: codec private isn't a master; is there a better way to re-use put_bmp_header?
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bmp_header = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE);
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put_bmp_header(pb, codec, codec_bmp_tags, 0);
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end_ebml_master(pb, bmp_header);
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}
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subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO);
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// XXX: interlace flag?
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put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
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put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
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// XXX: display width/height
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end_ebml_master(pb, subinfo);
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break;
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case CODEC_TYPE_AUDIO:
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put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
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if (!native_id) {
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offset_t wav_header;
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// no mkv-specific ID, use ACM mode
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codec->codec_tag = codec_get_tag(codec_wav_tags, codec->codec_id);
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if (!codec->codec_tag) {
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av_log(s, AV_LOG_ERROR, "no codec id found for stream %d", i);
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return -1;
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}
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put_ebml_string(pb, MATROSKA_ID_CODECID, MATROSKA_CODEC_ID_AUDIO_ACM);
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wav_header = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE);
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put_wav_header(pb, codec);
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end_ebml_master(pb, wav_header);
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}
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subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO);
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put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
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put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, codec->sample_rate);
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// XXX: output sample freq (for sbr)
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if (bit_depth)
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put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
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end_ebml_master(pb, subinfo);
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break;
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default:
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av_log(s, AV_LOG_ERROR, "Only audio and video are supported for Matroska.");
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break;
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}
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end_ebml_master(pb, track);
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// ms precision is the de-facto standard timescale for mkv files
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av_set_pts_info(st, 64, 1, 1000);
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}
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end_ebml_master(pb, tracks);
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return 0;
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}
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static int mkv_write_header(AVFormatContext *s)
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{
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MatroskaMuxContext *mkv = s->priv_data;
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ByteIOContext *pb = &s->pb;
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offset_t ebml_header, segment_info;
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ebml_header = start_ebml_master(pb, EBML_ID_HEADER);
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put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
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put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
|
|
put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
|
|
put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
|
|
put_ebml_string (pb, EBML_ID_DOCTYPE , "matroska");
|
|
put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
|
|
put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
|
|
end_ebml_master(pb, ebml_header);
|
|
|
|
mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT);
|
|
mkv->segment_offset = url_ftell(pb);
|
|
|
|
// we write 2 seek heads - one at the end of the file to point to each cluster, and
|
|
// one at the beginning to point to all other level one elements (including the seek
|
|
// head at the end of the file), which isn't more than 10 elements if we only write one
|
|
// of each other currently defined level 1 element
|
|
mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
|
|
mkv->cluster_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 0);
|
|
|
|
if (mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, url_ftell(pb)) < 0)
|
|
return -1;
|
|
|
|
segment_info = start_ebml_master(pb, MATROSKA_ID_INFO);
|
|
put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
|
|
if (strlen(s->title))
|
|
put_ebml_string(pb, MATROSKA_ID_TITLE, s->title);
|
|
if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
|
|
put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
|
|
// XXX: both are required; something better for writing app?
|
|
put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
|
|
}
|
|
// XXX: segment UID
|
|
// reserve space for the duration
|
|
mkv->duration = 0;
|
|
mkv->duration_offset = url_ftell(pb);
|
|
put_ebml_void(pb, 11); // assumes double-precision float to be written
|
|
end_ebml_master(pb, segment_info);
|
|
|
|
if (mkv_write_tracks(s) < 0)
|
|
return -1;
|
|
|
|
if (mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb)) < 0)
|
|
return -1;
|
|
|
|
mkv->cluster_pos = url_ftell(pb);
|
|
mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER);
|
|
put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, 0);
|
|
mkv->cluster_pts = 0;
|
|
|
|
mkv->cues = mkv_start_cues(mkv->segment_offset);
|
|
if (mkv->cues == NULL)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
MatroskaMuxContext *mkv = s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
int keyframe = !!(pkt->flags & PKT_FLAG_KEY);
|
|
|
|
// start a new cluster every 5 MB or 5 sec
|
|
if (url_ftell(pb) > mkv->cluster + 5*1024*1024 || pkt->pts > mkv->cluster_pts + 5000) {
|
|
end_ebml_master(pb, mkv->cluster);
|
|
|
|
if (mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb)) < 0)
|
|
return -1;
|
|
|
|
mkv->cluster_pos = url_ftell(pb);
|
|
mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER);
|
|
put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, pkt->pts);
|
|
mkv->cluster_pts = pkt->pts;
|
|
}
|
|
|
|
put_ebml_id(pb, MATROSKA_ID_SIMPLEBLOCK);
|
|
put_ebml_size(pb, pkt->size + 4, 0);
|
|
put_byte(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
|
|
put_be16(pb, pkt->pts - mkv->cluster_pts);
|
|
put_byte(pb, keyframe << 7);
|
|
put_buffer(pb, pkt->data, pkt->size);
|
|
|
|
if (s->streams[pkt->stream_index]->codec->codec_type == CODEC_TYPE_VIDEO && keyframe) {
|
|
if (mkv_add_cuepoint(mkv->cues, pkt, mkv->cluster_pos) < 0)
|
|
return -1;
|
|
}
|
|
|
|
mkv->duration = pkt->pts + pkt->duration;
|
|
return 0;
|
|
}
|
|
|
|
static int mkv_write_trailer(AVFormatContext *s)
|
|
{
|
|
MatroskaMuxContext *mkv = s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
offset_t currentpos, second_seekhead, cuespos;
|
|
|
|
end_ebml_master(pb, mkv->cluster);
|
|
|
|
cuespos = mkv_write_cues(pb, mkv->cues);
|
|
second_seekhead = mkv_write_seekhead(pb, mkv->cluster_seekhead);
|
|
|
|
mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES , cuespos);
|
|
mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_SEEKHEAD, second_seekhead);
|
|
mkv_write_seekhead(pb, mkv->main_seekhead);
|
|
|
|
// update the duration
|
|
currentpos = url_ftell(pb);
|
|
url_fseek(pb, mkv->duration_offset, SEEK_SET);
|
|
put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
|
|
url_fseek(pb, currentpos, SEEK_SET);
|
|
|
|
end_ebml_master(pb, mkv->segment);
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat matroska_muxer = {
|
|
"matroska",
|
|
"Matroska File Format",
|
|
"video/x-matroska",
|
|
"mkv",
|
|
sizeof(MatroskaMuxContext),
|
|
CODEC_ID_MP2,
|
|
CODEC_ID_MPEG4,
|
|
mkv_write_header,
|
|
mkv_write_packet,
|
|
mkv_write_trailer,
|
|
.codec_tag = (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0},
|
|
};
|