mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
833 lines
28 KiB
833 lines
28 KiB
/* |
|
* Matroska muxer |
|
* Copyright (c) 2007 David Conrad |
|
* |
|
* This file is part of FFmpeg. |
|
* |
|
* FFmpeg is free software; you can redistribute it and/or |
|
* modify it under the terms of the GNU Lesser General Public |
|
* License as published by the Free Software Foundation; either |
|
* version 2.1 of the License, or (at your option) any later version. |
|
* |
|
* FFmpeg is distributed in the hope that it will be useful, |
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
* Lesser General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU Lesser General Public |
|
* License along with FFmpeg; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#include "avformat.h" |
|
#include "md5.h" |
|
#include "riff.h" |
|
#include "xiph.h" |
|
#include "matroska.h" |
|
#include "avc.h" |
|
|
|
typedef struct ebml_master { |
|
offset_t pos; ///< absolute offset in the file where the master's elements start |
|
int sizebytes; ///< how many bytes were reserved for the size |
|
} ebml_master; |
|
|
|
typedef struct mkv_seekhead_entry { |
|
unsigned int elementid; |
|
uint64_t segmentpos; |
|
} mkv_seekhead_entry; |
|
|
|
typedef struct mkv_seekhead { |
|
offset_t filepos; |
|
offset_t segment_offset; ///< the file offset to the beginning of the segment |
|
int reserved_size; ///< -1 if appending to file |
|
int max_entries; |
|
mkv_seekhead_entry *entries; |
|
int num_entries; |
|
} mkv_seekhead; |
|
|
|
typedef struct { |
|
uint64_t pts; |
|
int tracknum; |
|
offset_t cluster_pos; ///< file offset of the cluster containing the block |
|
} mkv_cuepoint; |
|
|
|
typedef struct { |
|
offset_t segment_offset; |
|
mkv_cuepoint *entries; |
|
int num_entries; |
|
} mkv_cues; |
|
|
|
typedef struct MatroskaMuxContext { |
|
ebml_master segment; |
|
offset_t segment_offset; |
|
offset_t segment_uid; |
|
ebml_master cluster; |
|
offset_t cluster_pos; ///< file offset of the current cluster |
|
uint64_t cluster_pts; |
|
offset_t duration_offset; |
|
uint64_t duration; |
|
mkv_seekhead *main_seekhead; |
|
mkv_seekhead *cluster_seekhead; |
|
mkv_cues *cues; |
|
|
|
struct AVMD5 *md5_ctx; |
|
} MatroskaMuxContext; |
|
|
|
|
|
/** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit |
|
* offset, 4 bytes for target EBML ID */ |
|
#define MAX_SEEKENTRY_SIZE 21 |
|
|
|
/** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2 |
|
* 8-byte uint max */ |
|
#define MAX_CUETRACKPOS_SIZE 22 |
|
|
|
/** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */ |
|
#define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks |
|
|
|
|
|
static int ebml_id_size(unsigned int id) |
|
{ |
|
return (av_log2(id+1)-1)/7+1; |
|
} |
|
|
|
static void put_ebml_id(ByteIOContext *pb, unsigned int id) |
|
{ |
|
int i = ebml_id_size(id); |
|
while (i--) |
|
put_byte(pb, id >> (i*8)); |
|
} |
|
|
|
/** |
|
* Write an EBML size meaning "unknown size". |
|
* |
|
* @param bytes The number of bytes the size should occupy (maximum: 8). |
|
*/ |
|
static void put_ebml_size_unknown(ByteIOContext *pb, int bytes) |
|
{ |
|
assert(bytes <= 8); |
|
put_byte(pb, 0x1ff >> bytes); |
|
while (--bytes) |
|
put_byte(pb, 0xff); |
|
} |
|
|
|
/** |
|
* Calculate how many bytes are needed to represent a given number in EBML. |
|
*/ |
|
static int ebml_num_size(uint64_t num) |
|
{ |
|
int bytes = 1; |
|
while ((num+1) >> bytes*7) bytes++; |
|
return bytes; |
|
} |
|
|
|
/** |
|
* Write a number in EBML variable length format. |
|
* |
|
* @param bytes The number of bytes that need to be used to write the number. |
|
* If zero, any number of bytes can be used. |
|
*/ |
|
static void put_ebml_num(ByteIOContext *pb, uint64_t num, int bytes) |
|
{ |
|
int i, needed_bytes = ebml_num_size(num); |
|
|
|
// sizes larger than this are currently undefined in EBML |
|
assert(num < (1ULL<<56)-1); |
|
|
|
if (bytes == 0) |
|
// don't care how many bytes are used, so use the min |
|
bytes = needed_bytes; |
|
// the bytes needed to write the given size would exceed the bytes |
|
// that we need to use, so write unknown size. This shouldn't happen. |
|
assert(bytes >= needed_bytes); |
|
|
|
num |= 1ULL << bytes*7; |
|
for (i = bytes - 1; i >= 0; i--) |
|
put_byte(pb, num >> i*8); |
|
} |
|
|
|
static void put_ebml_uint(ByteIOContext *pb, unsigned int elementid, uint64_t val) |
|
{ |
|
int i, bytes = 1; |
|
while (val >> bytes*8) bytes++; |
|
|
|
put_ebml_id(pb, elementid); |
|
put_ebml_num(pb, bytes, 0); |
|
for (i = bytes - 1; i >= 0; i--) |
|
put_byte(pb, val >> i*8); |
|
} |
|
|
|
static void put_ebml_float(ByteIOContext *pb, unsigned int elementid, double val) |
|
{ |
|
put_ebml_id(pb, elementid); |
|
put_ebml_num(pb, 8, 0); |
|
put_be64(pb, av_dbl2int(val)); |
|
} |
|
|
|
static void put_ebml_binary(ByteIOContext *pb, unsigned int elementid, |
|
const uint8_t *buf, int size) |
|
{ |
|
put_ebml_id(pb, elementid); |
|
put_ebml_num(pb, size, 0); |
|
put_buffer(pb, buf, size); |
|
} |
|
|
|
static void put_ebml_string(ByteIOContext *pb, unsigned int elementid, const char *str) |
|
{ |
|
put_ebml_binary(pb, elementid, str, strlen(str)); |
|
} |
|
|
|
/** |
|
* Writes a void element of a given size. Useful for reserving space in |
|
* the file to be written to later. |
|
* |
|
* @param size The number of bytes to reserve, which must be at least 2. |
|
*/ |
|
static void put_ebml_void(ByteIOContext *pb, uint64_t size) |
|
{ |
|
offset_t currentpos = url_ftell(pb); |
|
|
|
assert(size >= 2); |
|
|
|
put_ebml_id(pb, EBML_ID_VOID); |
|
// we need to subtract the length needed to store the size from the |
|
// size we need to reserve so 2 cases, we use 8 bytes to store the |
|
// size if possible, 1 byte otherwise |
|
if (size < 10) |
|
put_ebml_num(pb, size-1, 0); |
|
else |
|
put_ebml_num(pb, size-9, 8); |
|
url_fseek(pb, currentpos + size, SEEK_SET); |
|
} |
|
|
|
static ebml_master start_ebml_master(ByteIOContext *pb, unsigned int elementid, uint64_t expectedsize) |
|
{ |
|
int bytes = expectedsize ? ebml_num_size(expectedsize) : 8; |
|
put_ebml_id(pb, elementid); |
|
put_ebml_size_unknown(pb, bytes); |
|
return (ebml_master){ url_ftell(pb), bytes }; |
|
} |
|
|
|
static void end_ebml_master(ByteIOContext *pb, ebml_master master) |
|
{ |
|
offset_t pos = url_ftell(pb); |
|
|
|
// leave the unknown size for masters when streaming |
|
if (url_is_streamed(pb)) |
|
return; |
|
|
|
url_fseek(pb, master.pos - master.sizebytes, SEEK_SET); |
|
put_ebml_num(pb, pos - master.pos, master.sizebytes); |
|
url_fseek(pb, pos, SEEK_SET); |
|
} |
|
|
|
static void put_xiph_size(ByteIOContext *pb, int size) |
|
{ |
|
int i; |
|
for (i = 0; i < size / 255; i++) |
|
put_byte(pb, 255); |
|
put_byte(pb, size % 255); |
|
} |
|
|
|
/** |
|
* Initialize a mkv_seekhead element to be ready to index level 1 Matroska |
|
* elements. If a maximum number of elements is specified, enough space |
|
* will be reserved at the current file location to write a seek head of |
|
* that size. |
|
* |
|
* @param segment_offset The absolute offset to the position in the file |
|
* where the segment begins. |
|
* @param numelements The maximum number of elements that will be indexed |
|
* by this seek head, 0 if unlimited. |
|
*/ |
|
static mkv_seekhead * mkv_start_seekhead(ByteIOContext *pb, offset_t segment_offset, int numelements) |
|
{ |
|
mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead)); |
|
if (new_seekhead == NULL) |
|
return NULL; |
|
|
|
new_seekhead->segment_offset = segment_offset; |
|
|
|
if (numelements > 0) { |
|
new_seekhead->filepos = url_ftell(pb); |
|
// 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID |
|
// and size, and 3 bytes to guarantee that an EBML void element |
|
// will fit afterwards |
|
new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13; |
|
new_seekhead->max_entries = numelements; |
|
put_ebml_void(pb, new_seekhead->reserved_size); |
|
} |
|
return new_seekhead; |
|
} |
|
|
|
static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos) |
|
{ |
|
mkv_seekhead_entry *entries = seekhead->entries; |
|
|
|
// don't store more elements than we reserved space for |
|
if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries) |
|
return -1; |
|
|
|
entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry)); |
|
if (entries == NULL) |
|
return AVERROR(ENOMEM); |
|
|
|
entries[seekhead->num_entries ].elementid = elementid; |
|
entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset; |
|
|
|
seekhead->entries = entries; |
|
return 0; |
|
} |
|
|
|
/** |
|
* Write the seek head to the file and free it. If a maximum number of |
|
* elements was specified to mkv_start_seekhead(), the seek head will |
|
* be written at the location reserved for it. Otherwise, it is written |
|
* at the current location in the file. |
|
* |
|
* @return The file offset where the seekhead was written. |
|
*/ |
|
static offset_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *seekhead) |
|
{ |
|
ebml_master metaseek, seekentry; |
|
offset_t currentpos; |
|
int i; |
|
|
|
currentpos = url_ftell(pb); |
|
|
|
if (seekhead->reserved_size > 0) |
|
url_fseek(pb, seekhead->filepos, SEEK_SET); |
|
|
|
metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size); |
|
for (i = 0; i < seekhead->num_entries; i++) { |
|
mkv_seekhead_entry *entry = &seekhead->entries[i]; |
|
|
|
seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE); |
|
|
|
put_ebml_id(pb, MATROSKA_ID_SEEKID); |
|
put_ebml_num(pb, ebml_id_size(entry->elementid), 0); |
|
put_ebml_id(pb, entry->elementid); |
|
|
|
put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos); |
|
end_ebml_master(pb, seekentry); |
|
} |
|
end_ebml_master(pb, metaseek); |
|
|
|
if (seekhead->reserved_size > 0) { |
|
uint64_t remaining = seekhead->filepos + seekhead->reserved_size - url_ftell(pb); |
|
put_ebml_void(pb, remaining); |
|
url_fseek(pb, currentpos, SEEK_SET); |
|
|
|
currentpos = seekhead->filepos; |
|
} |
|
av_free(seekhead->entries); |
|
av_free(seekhead); |
|
|
|
return currentpos; |
|
} |
|
|
|
static mkv_cues * mkv_start_cues(offset_t segment_offset) |
|
{ |
|
mkv_cues *cues = av_mallocz(sizeof(mkv_cues)); |
|
if (cues == NULL) |
|
return NULL; |
|
|
|
cues->segment_offset = segment_offset; |
|
return cues; |
|
} |
|
|
|
static int mkv_add_cuepoint(mkv_cues *cues, AVPacket *pkt, offset_t cluster_pos) |
|
{ |
|
mkv_cuepoint *entries = cues->entries; |
|
|
|
entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint)); |
|
if (entries == NULL) |
|
return AVERROR(ENOMEM); |
|
|
|
entries[cues->num_entries ].pts = pkt->pts; |
|
entries[cues->num_entries ].tracknum = pkt->stream_index + 1; |
|
entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset; |
|
|
|
cues->entries = entries; |
|
return 0; |
|
} |
|
|
|
static offset_t mkv_write_cues(ByteIOContext *pb, mkv_cues *cues, int num_tracks) |
|
{ |
|
ebml_master cues_element; |
|
offset_t currentpos; |
|
int i, j; |
|
|
|
currentpos = url_ftell(pb); |
|
cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0); |
|
|
|
for (i = 0; i < cues->num_entries; i++) { |
|
ebml_master cuepoint, track_positions; |
|
mkv_cuepoint *entry = &cues->entries[i]; |
|
uint64_t pts = entry->pts; |
|
|
|
cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks)); |
|
put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts); |
|
|
|
// put all the entries from different tracks that have the exact same |
|
// timestamp into the same CuePoint |
|
for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) { |
|
track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE); |
|
put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum ); |
|
put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos); |
|
end_ebml_master(pb, track_positions); |
|
} |
|
i += j - 1; |
|
end_ebml_master(pb, cuepoint); |
|
} |
|
end_ebml_master(pb, cues_element); |
|
|
|
av_free(cues->entries); |
|
av_free(cues); |
|
return currentpos; |
|
} |
|
|
|
static int put_xiph_codecpriv(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec) |
|
{ |
|
uint8_t *header_start[3]; |
|
int header_len[3]; |
|
int first_header_size; |
|
int j; |
|
|
|
if (codec->codec_id == CODEC_ID_VORBIS) |
|
first_header_size = 30; |
|
else |
|
first_header_size = 42; |
|
|
|
if (ff_split_xiph_headers(codec->extradata, codec->extradata_size, |
|
first_header_size, header_start, header_len) < 0) { |
|
av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n"); |
|
return -1; |
|
} |
|
|
|
put_byte(pb, 2); // number packets - 1 |
|
for (j = 0; j < 2; j++) { |
|
put_xiph_size(pb, header_len[j]); |
|
} |
|
for (j = 0; j < 3; j++) |
|
put_buffer(pb, header_start[j], header_len[j]); |
|
|
|
return 0; |
|
} |
|
|
|
#define FLAC_STREAMINFO_SIZE 34 |
|
|
|
static int put_flac_codecpriv(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec) |
|
{ |
|
// if the extradata_size is greater than FLAC_STREAMINFO_SIZE, |
|
// assume that it's in Matroska's format already |
|
if (codec->extradata_size < FLAC_STREAMINFO_SIZE) { |
|
av_log(s, AV_LOG_ERROR, "Invalid FLAC extradata\n"); |
|
return -1; |
|
} else if (codec->extradata_size == FLAC_STREAMINFO_SIZE) { |
|
// only the streaminfo packet |
|
put_byte(pb, 0); |
|
put_xiph_size(pb, codec->extradata_size); |
|
av_log(s, AV_LOG_ERROR, "Only one packet\n"); |
|
} |
|
put_buffer(pb, codec->extradata, codec->extradata_size); |
|
return 0; |
|
} |
|
|
|
static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate) |
|
{ |
|
static const int aac_sample_rates[] = { |
|
96000, 88200, 64000, 48000, 44100, 32000, |
|
24000, 22050, 16000, 12000, 11025, 8000, |
|
}; |
|
int sri; |
|
|
|
if (codec->extradata_size < 2) { |
|
av_log(s, AV_LOG_WARNING, "No AAC extradata, unable to determine samplerate.\n"); |
|
return; |
|
} |
|
|
|
sri = ((codec->extradata[0] << 1) & 0xE) | (codec->extradata[1] >> 7); |
|
if (sri > 12) { |
|
av_log(s, AV_LOG_WARNING, "AAC samplerate index out of bounds\n"); |
|
return; |
|
} |
|
*sample_rate = aac_sample_rates[sri]; |
|
|
|
// if sbr, get output sample rate as well |
|
if (codec->extradata_size == 5) { |
|
sri = (codec->extradata[4] >> 3) & 0xF; |
|
if (sri > 12) { |
|
av_log(s, AV_LOG_WARNING, "AAC output samplerate index out of bounds\n"); |
|
return; |
|
} |
|
*output_sample_rate = aac_sample_rates[sri]; |
|
} |
|
} |
|
|
|
static int mkv_write_codecprivate(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec, int native_id) |
|
{ |
|
ByteIOContext *dyn_cp; |
|
uint8_t *codecpriv; |
|
int ret, codecpriv_size; |
|
|
|
ret = url_open_dyn_buf(&dyn_cp); |
|
if(ret < 0) |
|
return ret; |
|
|
|
if (native_id) { |
|
if (codec->codec_id == CODEC_ID_VORBIS || codec->codec_id == CODEC_ID_THEORA) |
|
ret = put_xiph_codecpriv(s, dyn_cp, codec); |
|
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 = 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 (!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 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"); |
|
|
|
// 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) |
|
// 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); |
|
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_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", |
|
"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", |
|
"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}, |
|
};
|
|
|