867 lines
30 KiB
C
867 lines
30 KiB
C
/*
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* Matroska 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 "isom.h"
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#include "matroska.h"
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#include "avc.h"
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#include "libavutil/md5.h"
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#include "libavcodec/xiph.h"
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#include "libavcodec/mpeg4audio.h"
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typedef struct ebml_master {
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offset_t pos; ///< absolute offset in the file where the master's elements start
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int sizebytes; ///< how many bytes were reserved for the size
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} ebml_master;
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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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ebml_master segment;
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offset_t segment_offset;
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offset_t segment_uid;
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ebml_master 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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struct AVMD5 *md5_ctx;
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} MatroskaMuxContext;
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/** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
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* offset, 4 bytes for target EBML ID */
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#define MAX_SEEKENTRY_SIZE 21
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/** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
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* 8-byte uint max */
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#define MAX_CUETRACKPOS_SIZE 22
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/** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
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#define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
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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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static void put_ebml_id(ByteIOContext *pb, unsigned int id)
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{
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int i = ebml_id_size(id);
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while (i--)
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put_byte(pb, id >> (i*8));
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}
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/**
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* Write an EBML size meaning "unknown size".
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*
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* @param bytes The number of bytes the size should occupy (maximum: 8).
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*/
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static void put_ebml_size_unknown(ByteIOContext *pb, int bytes)
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{
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assert(bytes <= 8);
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put_byte(pb, 0x1ff >> bytes);
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while (--bytes)
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put_byte(pb, 0xff);
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}
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/**
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* Calculate how many bytes are needed to represent a given number in EBML.
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*/
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static int ebml_num_size(uint64_t num)
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{
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int bytes = 1;
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while ((num+1) >> bytes*7) bytes++;
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return bytes;
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}
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/**
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* Write a number in EBML variable length format.
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*
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* @param bytes The number of bytes that need to be used to write the number.
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* If zero, any number of bytes can be used.
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*/
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static void put_ebml_num(ByteIOContext *pb, uint64_t num, int bytes)
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{
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int i, needed_bytes = ebml_num_size(num);
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// sizes larger than this are currently undefined in EBML
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assert(num < (1ULL<<56)-1);
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if (bytes == 0)
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// don't care how many bytes are used, so use the min
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bytes = needed_bytes;
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// the bytes needed to write the given size would exceed the bytes
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// that we need to use, so write unknown size. This shouldn't happen.
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assert(bytes >= needed_bytes);
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num |= 1ULL << bytes*7;
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for (i = bytes - 1; i >= 0; i--)
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put_byte(pb, num >> i*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 i, bytes = 1;
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uint64_t tmp = val;
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while (tmp>>=8) bytes++;
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put_ebml_id(pb, elementid);
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put_ebml_num(pb, bytes, 0);
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for (i = bytes - 1; i >= 0; i--)
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put_byte(pb, val >> i*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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put_ebml_id(pb, elementid);
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put_ebml_num(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_num(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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/**
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* Writes a void element of a given size. Useful for reserving space in
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* the file to be written to later.
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*
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* @param size The number of bytes to reserve, which must be at least 2.
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*/
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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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assert(size >= 2);
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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
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// size we need to reserve so 2 cases, we use 8 bytes to store the
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// size if possible, 1 byte otherwise
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if (size < 10)
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put_ebml_num(pb, size-1, 0);
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else
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put_ebml_num(pb, size-9, 8);
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while(url_ftell(pb) < currentpos + size)
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put_byte(pb, 0);
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}
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static ebml_master start_ebml_master(ByteIOContext *pb, unsigned int elementid, uint64_t expectedsize)
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{
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int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
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put_ebml_id(pb, elementid);
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put_ebml_size_unknown(pb, bytes);
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return (ebml_master){ url_ftell(pb), bytes };
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}
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static void end_ebml_master(ByteIOContext *pb, ebml_master master)
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{
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offset_t pos = url_ftell(pb);
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// leave the unknown size for masters when streaming
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if (url_is_streamed(pb))
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return;
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url_fseek(pb, master.pos - master.sizebytes, SEEK_SET);
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put_ebml_num(pb, pos - master.pos, master.sizebytes);
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url_fseek(pb, pos, SEEK_SET);
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}
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static void put_xiph_size(ByteIOContext *pb, int size)
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{
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int i;
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for (i = 0; i < size / 255; i++)
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put_byte(pb, 255);
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put_byte(pb, size % 255);
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}
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/**
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* Initialize a mkv_seekhead element to be ready to index level 1 Matroska
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* elements. If a maximum number of elements is specified, enough space
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* will be reserved at the current file location to write a seek head of
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* that size.
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*
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* @param segment_offset The absolute offset to the position in the file
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* where the segment begins.
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* @param numelements The maximum number of elements that will be indexed
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* by this seek head, 0 if unlimited.
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*/
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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
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// and size, and 3 bytes to guarantee that an EBML void element
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// will fit afterwards
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new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 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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// 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 AVERROR(ENOMEM);
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entries[seekhead->num_entries ].elementid = elementid;
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entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
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seekhead->entries = entries;
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return 0;
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}
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/**
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* Write the seek head to the file and free it. If a maximum number of
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* elements was specified to mkv_start_seekhead(), the seek head will
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* be written at the location reserved for it. Otherwise, it is written
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* at the current location in the file.
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*
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* @return The file offset where the seekhead was written.
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*/
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static offset_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *seekhead)
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{
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ebml_master metaseek, seekentry;
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offset_t 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, seekhead->reserved_size);
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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, MAX_SEEKENTRY_SIZE);
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put_ebml_id(pb, MATROSKA_ID_SEEKID);
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put_ebml_num(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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entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
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if (entries == NULL)
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return AVERROR(ENOMEM);
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entries[cues->num_entries ].pts = pkt->pts;
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entries[cues->num_entries ].tracknum = pkt->stream_index + 1;
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entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
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cues->entries = 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, int num_tracks)
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{
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ebml_master cues_element;
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offset_t currentpos;
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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, 0);
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for (i = 0; i < cues->num_entries; i++) {
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ebml_master 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, MAX_CUEPOINT_SIZE(num_tracks));
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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, MAX_CUETRACKPOS_SIZE);
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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(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec)
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{
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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;
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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(s, AV_LOG_ERROR, "Extradata corrupt.\n");
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return -1;
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}
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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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put_xiph_size(pb, header_len[j]);
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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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return 0;
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}
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#define FLAC_STREAMINFO_SIZE 34
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static int put_flac_codecpriv(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec)
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{
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// if the extradata_size is greater than FLAC_STREAMINFO_SIZE,
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// assume that it's in Matroska's format already
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if (codec->extradata_size < FLAC_STREAMINFO_SIZE) {
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av_log(s, AV_LOG_ERROR, "Invalid FLAC extradata\n");
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return -1;
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} else if (codec->extradata_size == FLAC_STREAMINFO_SIZE) {
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// only the streaminfo packet
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put_buffer(pb, "fLaC", 4);
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put_byte(pb, 0x80);
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put_be24(pb, FLAC_STREAMINFO_SIZE);
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} else if(memcmp("fLaC", codec->extradata, 4)) {
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av_log(s, AV_LOG_ERROR, "Invalid FLAC extradata\n");
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return -1;
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}
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put_buffer(pb, codec->extradata, codec->extradata_size);
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return 0;
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}
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static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
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{
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int sri;
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if (codec->extradata_size < 2) {
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av_log(s, AV_LOG_WARNING, "No AAC extradata, unable to determine samplerate.\n");
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return;
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}
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sri = ((codec->extradata[0] << 1) & 0xE) | (codec->extradata[1] >> 7);
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if (sri > 12) {
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av_log(s, AV_LOG_WARNING, "AAC samplerate index out of bounds\n");
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return;
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}
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*sample_rate = ff_mpeg4audio_sample_rates[sri];
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// if sbr, get output sample rate as well
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if (codec->extradata_size == 5) {
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sri = (codec->extradata[4] >> 3) & 0xF;
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if (sri > 12) {
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av_log(s, AV_LOG_WARNING, "AAC output samplerate index out of bounds\n");
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return;
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}
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*output_sample_rate = ff_mpeg4audio_sample_rates[sri];
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}
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}
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static int mkv_write_codecprivate(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
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{
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ByteIOContext *dyn_cp;
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uint8_t *codecpriv;
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int ret, codecpriv_size;
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ret = url_open_dyn_buf(&dyn_cp);
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if(ret < 0)
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return ret;
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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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ret = put_xiph_codecpriv(s, dyn_cp, codec);
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else if (codec->codec_id == CODEC_ID_FLAC)
|
|
ret = put_flac_codecpriv(s, dyn_cp, codec);
|
|
else if (codec->codec_id == CODEC_ID_H264)
|
|
ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
|
|
else if (codec->extradata_size)
|
|
put_buffer(dyn_cp, codec->extradata, codec->extradata_size);
|
|
} else if (codec->codec_type == CODEC_TYPE_VIDEO) {
|
|
if (qt_id) {
|
|
if (!codec->codec_tag)
|
|
codec->codec_tag = codec_get_tag(codec_movvideo_tags, codec->codec_id);
|
|
if (codec->extradata_size)
|
|
put_buffer(dyn_cp, codec->extradata, codec->extradata_size);
|
|
} else {
|
|
if (!codec->codec_tag)
|
|
codec->codec_tag = codec_get_tag(codec_bmp_tags, codec->codec_id);
|
|
if (!codec->codec_tag) {
|
|
av_log(s, AV_LOG_ERROR, "No bmp codec ID found.");
|
|
ret = -1;
|
|
}
|
|
|
|
put_bmp_header(dyn_cp, codec, codec_bmp_tags, 0);
|
|
}
|
|
|
|
} else if (codec->codec_type == CODEC_TYPE_AUDIO) {
|
|
if (!codec->codec_tag)
|
|
codec->codec_tag = codec_get_tag(codec_wav_tags, codec->codec_id);
|
|
if (!codec->codec_tag) {
|
|
av_log(s, AV_LOG_ERROR, "No wav codec ID found.");
|
|
ret = -1;
|
|
}
|
|
|
|
put_wav_header(dyn_cp, codec);
|
|
}
|
|
|
|
codecpriv_size = url_close_dyn_buf(dyn_cp, &codecpriv);
|
|
if (codecpriv_size)
|
|
put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
|
|
av_free(codecpriv);
|
|
return ret;
|
|
}
|
|
|
|
static int mkv_write_tracks(AVFormatContext *s)
|
|
{
|
|
MatroskaMuxContext *mkv = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
ebml_master tracks;
|
|
int i, j, ret;
|
|
|
|
ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, url_ftell(pb));
|
|
if (ret < 0) return ret;
|
|
|
|
tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
AVCodecContext *codec = st->codec;
|
|
ebml_master subinfo, track;
|
|
int native_id = 0;
|
|
int qt_id = 0;
|
|
int bit_depth = av_get_bits_per_sample(codec->codec_id);
|
|
int sample_rate = codec->sample_rate;
|
|
int output_sample_rate = 0;
|
|
|
|
if (!bit_depth)
|
|
bit_depth = av_get_bits_per_sample_format(codec->sample_fmt);
|
|
|
|
if (codec->codec_id == CODEC_ID_AAC)
|
|
get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
|
|
|
|
track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
|
|
put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
|
|
put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
|
|
put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
|
|
|
|
if (st->language[0])
|
|
put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, st->language);
|
|
else
|
|
put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, "und");
|
|
|
|
put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
|
|
|
|
// look for a codec ID string specific to mkv to use,
|
|
// if none are found, use AVI codes
|
|
for (j = 0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++) {
|
|
if (ff_mkv_codec_tags[j].id == codec->codec_id) {
|
|
put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
|
|
native_id = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
switch (codec->codec_type) {
|
|
case CODEC_TYPE_VIDEO:
|
|
put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
|
|
|
|
if (!native_id &&
|
|
codec_get_tag(codec_movvideo_tags, codec->codec_id) &&
|
|
(!codec_get_tag(codec_bmp_tags, codec->codec_id)
|
|
|| codec->codec_id == CODEC_ID_SVQ1
|
|
|| codec->codec_id == CODEC_ID_SVQ3
|
|
|| codec->codec_id == CODEC_ID_CINEPAK))
|
|
qt_id = 1;
|
|
|
|
if (qt_id)
|
|
put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
|
|
else if (!native_id)
|
|
// if there is no mkv-specific codec ID, use VFW mode
|
|
put_ebml_string(pb, MATROSKA_ID_CODECID, MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC);
|
|
|
|
subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
|
|
// XXX: interlace flag?
|
|
put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
|
|
put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
|
|
if (codec->sample_aspect_ratio.num) {
|
|
AVRational dar = av_mul_q(codec->sample_aspect_ratio,
|
|
(AVRational){codec->width, codec->height});
|
|
put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , dar.num);
|
|
put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, dar.den);
|
|
}
|
|
end_ebml_master(pb, subinfo);
|
|
break;
|
|
|
|
case CODEC_TYPE_AUDIO:
|
|
put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
|
|
|
|
if (!native_id)
|
|
// no mkv-specific ID, use ACM mode
|
|
put_ebml_string(pb, MATROSKA_ID_CODECID, MATROSKA_CODEC_ID_AUDIO_ACM);
|
|
|
|
subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
|
|
put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
|
|
put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
|
|
if (output_sample_rate)
|
|
put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
|
|
if (bit_depth)
|
|
put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
|
|
end_ebml_master(pb, subinfo);
|
|
break;
|
|
|
|
case CODEC_TYPE_SUBTITLE:
|
|
put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
|
|
break;
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.");
|
|
break;
|
|
}
|
|
ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
|
|
if (ret < 0) return ret;
|
|
|
|
end_ebml_master(pb, track);
|
|
|
|
// ms precision is the de-facto standard timescale for mkv files
|
|
av_set_pts_info(st, 64, 1, 1000);
|
|
}
|
|
end_ebml_master(pb, tracks);
|
|
return 0;
|
|
}
|
|
|
|
static int mkv_write_header(AVFormatContext *s)
|
|
{
|
|
MatroskaMuxContext *mkv = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
ebml_master ebml_header, segment_info;
|
|
int ret;
|
|
|
|
mkv->md5_ctx = av_mallocz(av_md5_size);
|
|
av_md5_init(mkv->md5_ctx);
|
|
|
|
ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
|
|
put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
|
|
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, 0);
|
|
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->main_seekhead == NULL || mkv->cluster_seekhead == NULL)
|
|
return AVERROR(ENOMEM);
|
|
|
|
ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, url_ftell(pb));
|
|
if (ret < 0) return ret;
|
|
|
|
segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
|
|
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);
|
|
put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
|
|
|
|
// reserve space to write the segment UID later
|
|
mkv->segment_uid = url_ftell(pb);
|
|
put_ebml_void(pb, 19);
|
|
}
|
|
|
|
// 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);
|
|
|
|
ret = mkv_write_tracks(s);
|
|
if (ret < 0) return ret;
|
|
|
|
ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb));
|
|
if (ret < 0) return ret;
|
|
|
|
mkv->cluster_pos = url_ftell(pb);
|
|
mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
|
|
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 AVERROR(ENOMEM);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mkv_block_size(AVPacket *pkt)
|
|
{
|
|
int size = 4; // track num + timecode + flags
|
|
return size + pkt->size;
|
|
}
|
|
|
|
static int mkv_blockgroup_size(AVPacket *pkt)
|
|
{
|
|
int size = mkv_block_size(pkt);
|
|
size += ebml_num_size(size);
|
|
size += 2; // EBML ID for block and block duration
|
|
size += 8; // max size of block duration
|
|
size += ebml_num_size(size);
|
|
size += 1; // blockgroup EBML ID
|
|
return size;
|
|
}
|
|
|
|
static void mkv_write_block(AVFormatContext *s, unsigned int blockid, AVPacket *pkt, int flags)
|
|
{
|
|
MatroskaMuxContext *mkv = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
|
|
av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
|
|
"pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
|
|
url_ftell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
|
|
put_ebml_id(pb, blockid);
|
|
put_ebml_num(pb, mkv_block_size(pkt), 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, flags);
|
|
put_buffer(pb, pkt->data, pkt->size);
|
|
}
|
|
|
|
static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
MatroskaMuxContext *mkv = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
|
|
int keyframe = !!(pkt->flags & PKT_FLAG_KEY);
|
|
int ret;
|
|
|
|
// start a new cluster every 5 MB or 5 sec
|
|
if (url_ftell(pb) > mkv->cluster_pos + 5*1024*1024 || pkt->pts > mkv->cluster_pts + 5000) {
|
|
av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
|
|
" bytes, pts %" PRIu64 "\n", url_ftell(pb), pkt->pts);
|
|
end_ebml_master(pb, mkv->cluster);
|
|
|
|
ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb));
|
|
if (ret < 0) return ret;
|
|
|
|
mkv->cluster_pos = url_ftell(pb);
|
|
mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
|
|
put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, pkt->pts);
|
|
mkv->cluster_pts = pkt->pts;
|
|
av_md5_update(mkv->md5_ctx, pkt->data, FFMIN(200, pkt->size));
|
|
}
|
|
|
|
if (codec->codec_id == CODEC_ID_H264 &&
|
|
codec->extradata_size > 0 && AV_RB32(codec->extradata) == 0x00000001) {
|
|
/* from x264 or from bytestream h264 */
|
|
/* nal reformating needed */
|
|
int ret = ff_avc_parse_nal_units(pkt->data, &pkt->data, &pkt->size);
|
|
if (ret < 0)
|
|
return ret;
|
|
assert(pkt->size);
|
|
}
|
|
|
|
if (codec->codec_type != CODEC_TYPE_SUBTITLE) {
|
|
mkv_write_block(s, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
|
|
} else {
|
|
ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt));
|
|
mkv_write_block(s, MATROSKA_ID_BLOCK, pkt, 0);
|
|
put_ebml_uint(pb, MATROSKA_ID_DURATION, pkt->duration);
|
|
end_ebml_master(pb, blockgroup);
|
|
}
|
|
|
|
if (codec->codec_type == CODEC_TYPE_VIDEO && keyframe) {
|
|
ret = mkv_add_cuepoint(mkv->cues, pkt, mkv->cluster_pos);
|
|
if (ret < 0) return ret;
|
|
}
|
|
|
|
mkv->duration = FFMAX(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;
|
|
int ret;
|
|
|
|
end_ebml_master(pb, mkv->cluster);
|
|
|
|
if (!url_is_streamed(pb)) {
|
|
cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
|
|
second_seekhead = mkv_write_seekhead(pb, mkv->cluster_seekhead);
|
|
|
|
ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES , cuespos);
|
|
if (ret < 0) return ret;
|
|
ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_SEEKHEAD, second_seekhead);
|
|
if (ret < 0) return ret;
|
|
mkv_write_seekhead(pb, mkv->main_seekhead);
|
|
|
|
// update the duration
|
|
av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
|
|
currentpos = url_ftell(pb);
|
|
url_fseek(pb, mkv->duration_offset, SEEK_SET);
|
|
put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
|
|
|
|
// write the md5sum of some frames as the segment UID
|
|
if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
|
|
uint8_t segment_uid[16];
|
|
av_md5_final(mkv->md5_ctx, segment_uid);
|
|
url_fseek(pb, mkv->segment_uid, SEEK_SET);
|
|
put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
|
|
}
|
|
url_fseek(pb, currentpos, SEEK_SET);
|
|
}
|
|
|
|
end_ebml_master(pb, mkv->segment);
|
|
av_free(mkv->md5_ctx);
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat matroska_muxer = {
|
|
"matroska",
|
|
NULL_IF_CONFIG_SMALL("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},
|
|
.subtitle_codec = CODEC_ID_TEXT,
|
|
};
|
|
|
|
AVOutputFormat matroska_audio_muxer = {
|
|
"matroska",
|
|
NULL_IF_CONFIG_SMALL("Matroska file format"),
|
|
"audio/x-matroska",
|
|
"mka",
|
|
sizeof(MatroskaMuxContext),
|
|
CODEC_ID_MP2,
|
|
CODEC_ID_NONE,
|
|
mkv_write_header,
|
|
mkv_write_packet,
|
|
mkv_write_trailer,
|
|
.codec_tag = (const AVCodecTag*[]){codec_wav_tags, 0},
|
|
};
|