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ffmpeg/libavformat/matroskaenc.c
Andreas Rheinhardt 053144008e avformat/matroskaenc: Add support for FlagTextDescriptions 
This is the Matroska equivalent of D_WEBVTT_DESCRIPTIONS and is
therefore only enabled for subtitles.

Reviewed-by: Ridley Combs <rcombs@rcombs.me>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2021-02-22 04:14:26 +01:00

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/*
* 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 <stdint.h>
#include "av1.h"
#include "avc.h"
#include "hevc.h"
#include "avformat.h"
#include "avio_internal.h"
#include "avlanguage.h"
#include "flacenc.h"
#include "internal.h"
#include "isom.h"
#include "matroska.h"
#include "riff.h"
#include "vorbiscomment.h"
#include "wv.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "libavutil/dict.h"
#include "libavutil/intfloat.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/lfg.h"
#include "libavutil/mastering_display_metadata.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/random_seed.h"
#include "libavutil/rational.h"
#include "libavutil/samplefmt.h"
#include "libavutil/stereo3d.h"
#include "libavcodec/xiph.h"
#include "libavcodec/mpeg4audio.h"
/* Level 1 elements we create a SeekHead entry for:
* Info, Tracks, Chapters, Attachments, Tags (potentially twice) and Cues */
#define MAX_SEEKHEAD_ENTRIES 7
#define IS_SEEKABLE(pb, mkv) (((pb)->seekable & AVIO_SEEKABLE_NORMAL) && \
!(mkv)->is_live)
enum {
DEFAULT_MODE_INFER,
DEFAULT_MODE_INFER_NO_SUBS,
DEFAULT_MODE_PASSTHROUGH,
};
typedef struct ebml_master {
int64_t pos; ///< absolute offset in the containing AVIOContext where the master's elements start
int sizebytes; ///< how many bytes were reserved for the size
} ebml_master;
typedef struct ebml_stored_master {
AVIOContext *bc;
int64_t pos;
} ebml_stored_master;
typedef struct mkv_seekhead_entry {
uint32_t elementid;
uint64_t segmentpos;
} mkv_seekhead_entry;
typedef struct mkv_seekhead {
int64_t filepos;
mkv_seekhead_entry entries[MAX_SEEKHEAD_ENTRIES];
int num_entries;
int reserved_size;
} mkv_seekhead;
typedef struct mkv_cuepoint {
uint64_t pts;
int stream_idx;
int64_t cluster_pos; ///< offset of the cluster containing the block relative to the segment
int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
int64_t duration; ///< duration of the block according to time base
} mkv_cuepoint;
typedef struct mkv_cues {
mkv_cuepoint *entries;
int num_entries;
} mkv_cues;
typedef struct mkv_track {
int write_dts;
int has_cue;
uint64_t uid;
unsigned track_num;
int track_num_size;
int sample_rate;
int64_t sample_rate_offset;
int64_t last_timestamp;
int64_t duration;
int64_t duration_offset;
int64_t codecpriv_offset;
int64_t ts_offset;
} mkv_track;
#define MODE_MATROSKAv2 0x01
#define MODE_WEBM 0x02
typedef struct MatroskaMuxContext {
const AVClass *class;
int mode;
ebml_stored_master info;
ebml_stored_master track;
ebml_stored_master tags;
int64_t segment_offset;
AVIOContext *cluster_bc;
int64_t cluster_pos; ///< file offset of the current Cluster
int64_t cluster_pts;
int64_t duration_offset;
int64_t duration;
mkv_track *tracks;
mkv_seekhead seekhead;
mkv_cues cues;
int64_t cues_pos;
AVPacket cur_audio_pkt;
unsigned nb_attachments;
int have_video;
int wrote_chapters;
int wrote_tags;
int reserve_cues_space;
int cluster_size_limit;
int64_t cluster_time_limit;
int write_crc;
int is_live;
int is_dash;
int dash_track_number;
int allow_raw_vfw;
int flipped_raw_rgb;
int default_mode;
uint32_t segment_uid[4];
} MatroskaMuxContext;
/** 2 bytes * 7 for EBML IDs, 7 1-byte EBML lengths, 6 1-byte uint,
* 8 byte for "matroska" doctype string */
#define MAX_EBML_HEADER_SIZE 35
/** 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
/** 4 * (1-byte EBML ID, 1-byte EBML size, 8-byte uint max) */
#define MAX_CUETRACKPOS_SIZE 40
/** Seek preroll value for opus */
#define OPUS_SEEK_PREROLL 80000000
static int ebml_id_size(uint32_t id)
{
return (av_log2(id) + 7U) / 8;
}
static void put_ebml_id(AVIOContext *pb, uint32_t id)
{
int i = ebml_id_size(id);
while (i--)
avio_w8(pb, (uint8_t)(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(AVIOContext *pb, int bytes)
{
av_assert0(bytes <= 8);
avio_w8(pb, 0x1ff >> bytes);
ffio_fill(pb, 0xff, bytes - 1);
}
/**
* Returns how many bytes are needed to represent a number
* as EBML variable length integer.
*/
static int ebml_num_size(uint64_t num)
{
int bytes = 0;
do {
bytes++;
} while (num >>= 7);
return bytes;
}
/**
* Calculate how many bytes are needed to represent the length field
* of an EBML element whose payload has a given length.
*/
static int ebml_length_size(uint64_t length)
{
return ebml_num_size(length + 1);
}
/**
* Write a number as EBML variable length integer on `bytes` bytes.
* `bytes` is taken literally without checking.
*/
static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
{
num |= 1ULL << bytes * 7;
for (int i = bytes - 1; i >= 0; i--)
avio_w8(pb, (uint8_t)(num >> i * 8));
}
/**
* Write a length as EBML variable length integer.
*
* @param bytes The number of bytes that need to be used to write the number.
* If zero, the minimal number of bytes will be used.
*/
static void put_ebml_length(AVIOContext *pb, uint64_t length, int bytes)
{
int needed_bytes = ebml_length_size(length);
// sizes larger than this are currently undefined in EBML
av_assert0(length < (1ULL << 56) - 1);
if (bytes == 0)
bytes = needed_bytes;
// The bytes needed to write the given size must not exceed
// the bytes that we ought to use.
av_assert0(bytes >= needed_bytes);
put_ebml_num(pb, length, bytes);
}
/**
* Write a (random) UID with fixed size to make the output more deterministic
*/
static void put_ebml_uid(AVIOContext *pb, uint32_t elementid, uint64_t uid)
{
put_ebml_id(pb, elementid);
put_ebml_length(pb, 8, 0);
avio_wb64(pb, uid);
}
static void put_ebml_uint(AVIOContext *pb, uint32_t elementid, uint64_t val)
{
int i, bytes = 1;
uint64_t tmp = val;
while (tmp >>= 8)
bytes++;
put_ebml_id(pb, elementid);
put_ebml_length(pb, bytes, 0);
for (i = bytes - 1; i >= 0; i--)
avio_w8(pb, (uint8_t)(val >> i * 8));
}
static void put_ebml_sint(AVIOContext *pb, uint32_t elementid, int64_t val)
{
int i, bytes = 1;
uint64_t tmp = 2*(val < 0 ? val^-1 : val);
while (tmp >>= 8)
bytes++;
put_ebml_id(pb, elementid);
put_ebml_length(pb, bytes, 0);
for (i = bytes - 1; i >= 0; i--)
avio_w8(pb, (uint8_t)(val >> i * 8));
}
static void put_ebml_float(AVIOContext *pb, uint32_t elementid, double val)
{
put_ebml_id(pb, elementid);
put_ebml_length(pb, 8, 0);
avio_wb64(pb, av_double2int(val));
}
static void put_ebml_binary(AVIOContext *pb, uint32_t elementid,
const void *buf, int size)
{
put_ebml_id(pb, elementid);
put_ebml_length(pb, size, 0);
avio_write(pb, buf, size);
}
static void put_ebml_string(AVIOContext *pb, uint32_t elementid,
const char *str)
{
put_ebml_binary(pb, elementid, str, strlen(str));
}
/**
* Write 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(AVIOContext *pb, int size)
{
av_assert0(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) {
size -= 2;
put_ebml_length(pb, size, 0);
} else {
size -= 9;
put_ebml_length(pb, size, 8);
}
ffio_fill(pb, 0, size);
}
static ebml_master start_ebml_master(AVIOContext *pb, uint32_t elementid,
uint64_t expectedsize)
{
int bytes = expectedsize ? ebml_length_size(expectedsize) : 8;
put_ebml_id(pb, elementid);
put_ebml_size_unknown(pb, bytes);
return (ebml_master) { avio_tell(pb), bytes };
}
static void end_ebml_master(AVIOContext *pb, ebml_master master)
{
int64_t pos = avio_tell(pb);
if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
return;
put_ebml_length(pb, pos - master.pos, master.sizebytes);
avio_seek(pb, pos, SEEK_SET);
}
static void mkv_add_seekhead_entry(MatroskaMuxContext *mkv, uint32_t elementid,
uint64_t filepos)
{
mkv_seekhead *seekhead = &mkv->seekhead;
av_assert1(seekhead->num_entries < MAX_SEEKHEAD_ENTRIES);
seekhead->entries[seekhead->num_entries].elementid = elementid;
seekhead->entries[seekhead->num_entries++].segmentpos = filepos - mkv->segment_offset;
}
static int start_ebml_master_crc32(AVIOContext **dyn_cp, MatroskaMuxContext *mkv)
{
int ret;
if (!*dyn_cp && (ret = avio_open_dyn_buf(dyn_cp)) < 0)
return ret;
if (mkv->write_crc)
put_ebml_void(*dyn_cp, 6); /* Reserve space for CRC32 so position/size calculations using avio_tell() take it into account */
return 0;
}
static int end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp,
MatroskaMuxContext *mkv, uint32_t id,
int length_size, int keep_buffer,
int add_seekentry)
{
uint8_t *buf, crc[4];
int ret, size, skip = 0;
size = avio_get_dyn_buf(*dyn_cp, &buf);
if ((ret = (*dyn_cp)->error) < 0)
goto fail;
if (add_seekentry)
mkv_add_seekhead_entry(mkv, id, avio_tell(pb));
put_ebml_id(pb, id);
put_ebml_length(pb, size, length_size);
if (mkv->write_crc) {
skip = 6; /* Skip reserved 6-byte long void element from the dynamic buffer. */
AV_WL32(crc, av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), UINT32_MAX, buf + skip, size - skip) ^ UINT32_MAX);
put_ebml_binary(pb, EBML_ID_CRC32, crc, sizeof(crc));
}
avio_write(pb, buf + skip, size - skip);
fail:
if (keep_buffer) {
ffio_reset_dyn_buf(*dyn_cp);
} else {
ffio_free_dyn_buf(dyn_cp);
}
return ret;
}
/**
* Output EBML master. Keep the buffer if seekable, allowing for later updates.
* Furthermore always add a SeekHead Entry for this element.
*/
static int end_ebml_master_crc32_tentatively(AVIOContext *pb,
ebml_stored_master *elem,
MatroskaMuxContext *mkv, uint32_t id)
{
if (IS_SEEKABLE(pb, mkv)) {
uint8_t *buf;
int size = avio_get_dyn_buf(elem->bc, &buf);
if (elem->bc->error < 0)
return elem->bc->error;
elem->pos = avio_tell(pb);
mkv_add_seekhead_entry(mkv, id, elem->pos);
put_ebml_id(pb, id);
put_ebml_length(pb, size, 0);
avio_write(pb, buf, size);
return 0;
} else
return end_ebml_master_crc32(pb, &elem->bc, mkv, id, 0, 0, 1);
}
static void put_xiph_size(AVIOContext *pb, int size)
{
ffio_fill(pb, 255, size / 255);
avio_w8(pb, size % 255);
}
/**
* Free the members allocated in the mux context.
*/
static void mkv_deinit(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
av_packet_unref(&mkv->cur_audio_pkt);
ffio_free_dyn_buf(&mkv->cluster_bc);
ffio_free_dyn_buf(&mkv->info.bc);
ffio_free_dyn_buf(&mkv->track.bc);
ffio_free_dyn_buf(&mkv->tags.bc);
av_freep(&mkv->cues.entries);
av_freep(&mkv->tracks);
}
/**
* Initialize the SeekHead element to be ready to index level 1 Matroska
* elements. Enough space to write MAX_SEEKHEAD_ENTRIES SeekHead entries
* will be reserved at the current file location.
*/
static void mkv_start_seekhead(MatroskaMuxContext *mkv, AVIOContext *pb)
{
mkv->seekhead.filepos = avio_tell(pb);
// 21 bytes max for a Seek entry, 6 bytes max for the SeekHead ID
// and size, 6 bytes for a CRC32 element, and 2 bytes to guarantee
// that an EBML void element will fit afterwards
mkv->seekhead.reserved_size = MAX_SEEKHEAD_ENTRIES * MAX_SEEKENTRY_SIZE + 14;
put_ebml_void(pb, mkv->seekhead.reserved_size);
}
/**
* Write the SeekHead to the file at the location reserved for it
* and seek to destpos afterwards. When error_on_seek_failure
* is not set, failure to seek to the position designated for the
* SeekHead is not considered an error and it is presumed that
* destpos is the current position; failure to seek to destpos
* afterwards is always an error.
*
* @return 0 on success, < 0 on error.
*/
static int mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv,
int error_on_seek_failure, int64_t destpos)
{
AVIOContext *dyn_cp = NULL;
mkv_seekhead *seekhead = &mkv->seekhead;
int64_t remaining, ret64;
int i, ret;
if ((ret64 = avio_seek(pb, seekhead->filepos, SEEK_SET)) < 0)
return error_on_seek_failure ? ret64 : 0;
ret = start_ebml_master_crc32(&dyn_cp, mkv);
if (ret < 0)
return ret;
for (i = 0; i < seekhead->num_entries; i++) {
mkv_seekhead_entry *entry = &seekhead->entries[i];
ebml_master seekentry = start_ebml_master(dyn_cp, MATROSKA_ID_SEEKENTRY,
MAX_SEEKENTRY_SIZE);
put_ebml_id(dyn_cp, MATROSKA_ID_SEEKID);
put_ebml_length(dyn_cp, ebml_id_size(entry->elementid), 0);
put_ebml_id(dyn_cp, entry->elementid);
put_ebml_uint(dyn_cp, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
end_ebml_master(dyn_cp, seekentry);
}
ret = end_ebml_master_crc32(pb, &dyn_cp, mkv,
MATROSKA_ID_SEEKHEAD, 0, 0, 0);
if (ret < 0)
return ret;
remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
put_ebml_void(pb, remaining);
if ((ret64 = avio_seek(pb, destpos, SEEK_SET)) < 0)
return ret64;
return 0;
}
static int mkv_add_cuepoint(MatroskaMuxContext *mkv, int stream, int64_t ts,
int64_t cluster_pos, int64_t relative_pos, int64_t duration)
{
mkv_cues *cues = &mkv->cues;
mkv_cuepoint *entries = cues->entries;
if (ts < 0)
return 0;
entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
if (!entries)
return AVERROR(ENOMEM);
cues->entries = entries;
cues->entries[cues->num_entries].pts = ts;
cues->entries[cues->num_entries].stream_idx = stream;
cues->entries[cues->num_entries].cluster_pos = cluster_pos - mkv->segment_offset;
cues->entries[cues->num_entries].relative_pos = relative_pos;
cues->entries[cues->num_entries++].duration = duration;
return 0;
}
static int mkv_assemble_cues(AVStream **streams, AVIOContext *dyn_cp,
mkv_cues *cues, mkv_track *tracks, int num_tracks)
{
AVIOContext *cuepoint;
int ret;
ret = avio_open_dyn_buf(&cuepoint);
if (ret < 0)
return ret;
for (mkv_cuepoint *entry = cues->entries, *end = entry + cues->num_entries;
entry < end;) {
uint64_t pts = entry->pts;
uint8_t *buf;
int size;
put_ebml_uint(cuepoint, MATROSKA_ID_CUETIME, pts);
// put all the entries from different tracks that have the exact same
// timestamp into the same CuePoint
for (int j = 0; j < num_tracks; j++)
tracks[j].has_cue = 0;
do {
ebml_master track_positions;
int idx = entry->stream_idx;
av_assert0(idx >= 0 && idx < num_tracks);
if (tracks[idx].has_cue && streams[idx]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
continue;
tracks[idx].has_cue = 1;
track_positions = start_ebml_master(cuepoint, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
put_ebml_uint(cuepoint, MATROSKA_ID_CUETRACK , tracks[idx].track_num);
put_ebml_uint(cuepoint, MATROSKA_ID_CUECLUSTERPOSITION , entry->cluster_pos);
put_ebml_uint(cuepoint, MATROSKA_ID_CUERELATIVEPOSITION, entry->relative_pos);
if (entry->duration != -1)
put_ebml_uint(cuepoint, MATROSKA_ID_CUEDURATION , entry->duration);
end_ebml_master(cuepoint, track_positions);
} while (++entry < end && entry->pts == pts);
size = avio_get_dyn_buf(cuepoint, &buf);
if ((ret = cuepoint->error) < 0)
break;
put_ebml_binary(dyn_cp, MATROSKA_ID_POINTENTRY, buf, size);
ffio_reset_dyn_buf(cuepoint);
}
ffio_free_dyn_buf(&cuepoint);
return ret;
}
static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb,
const AVCodecParameters *par)
{
const uint8_t *header_start[3];
int header_len[3];
int first_header_size;
int err, j;
if (par->codec_id == AV_CODEC_ID_VORBIS)
first_header_size = 30;
else
first_header_size = 42;
err = avpriv_split_xiph_headers(par->extradata, par->extradata_size,
first_header_size, header_start, header_len);
if (err < 0) {
av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
return err;
}
avio_w8(pb, 2); // number packets - 1
for (j = 0; j < 2; j++) {
put_xiph_size(pb, header_len[j]);
}
for (j = 0; j < 3; j++)
avio_write(pb, header_start[j], header_len[j]);
return 0;
}
static int put_wv_codecpriv(AVIOContext *pb, const AVCodecParameters *par)
{
if (par->extradata && par->extradata_size == 2)
avio_write(pb, par->extradata, 2);
else
avio_wl16(pb, 0x410); // fallback to the most recent version
return 0;
}
static int put_flac_codecpriv(AVFormatContext *s, AVIOContext *pb,
const AVCodecParameters *par)
{
int write_comment = (par->channel_layout &&
!(par->channel_layout & ~0x3ffffULL) &&
!ff_flac_is_native_layout(par->channel_layout));
int ret = ff_flac_write_header(pb, par->extradata, par->extradata_size,
!write_comment);
if (ret < 0)
return ret;
if (write_comment) {
const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
"Lavf" : LIBAVFORMAT_IDENT;
AVDictionary *dict = NULL;
uint8_t buf[32];
int64_t len;
snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
len = ff_vorbiscomment_length(dict, vendor, NULL, 0);
av_assert1(len < (1 << 24) - 4);
avio_w8(pb, 0x84);
avio_wb24(pb, len);
ff_vorbiscomment_write(pb, dict, vendor, NULL, 0);
av_dict_free(&dict);
}
return 0;
}
static int get_aac_sample_rates(AVFormatContext *s, MatroskaMuxContext *mkv,
const uint8_t *extradata, int extradata_size,
int *sample_rate, int *output_sample_rate)
{
MPEG4AudioConfig mp4ac;
int ret;
ret = avpriv_mpeg4audio_get_config2(&mp4ac, extradata, extradata_size, 1, s);
/* Don't abort if the failure is because of missing extradata. Assume in that
* case a bitstream filter will provide the muxer with the extradata in the
* first packet.
* Abort however if s->pb is not seekable, as we would not be able to seek back
* to write the sample rate elements once the extradata shows up, anyway. */
if (ret < 0 && (extradata_size || !IS_SEEKABLE(s->pb, mkv))) {
av_log(s, AV_LOG_ERROR,
"Error parsing AAC extradata, unable to determine samplerate.\n");
return AVERROR(EINVAL);
}
if (ret < 0) {
/* This will only happen when this function is called while writing the
* header and no extradata is available. The space for this element has
* to be reserved for when this function is called again after the
* extradata shows up in the first packet, as there's no way to know if
* output_sample_rate will be different than sample_rate or not. */
*output_sample_rate = *sample_rate;
} else {
*sample_rate = mp4ac.sample_rate;
*output_sample_rate = mp4ac.ext_sample_rate;
}
return 0;
}
static int mkv_write_native_codecprivate(AVFormatContext *s, AVIOContext *pb,
const AVCodecParameters *par,
AVIOContext *dyn_cp)
{
switch (par->codec_id) {
case AV_CODEC_ID_VORBIS:
case AV_CODEC_ID_THEORA:
return put_xiph_codecpriv(s, dyn_cp, par);
case AV_CODEC_ID_FLAC:
return put_flac_codecpriv(s, dyn_cp, par);
case AV_CODEC_ID_WAVPACK:
return put_wv_codecpriv(dyn_cp, par);
case AV_CODEC_ID_H264:
return ff_isom_write_avcc(dyn_cp, par->extradata,
par->extradata_size);
case AV_CODEC_ID_HEVC:
return ff_isom_write_hvcc(dyn_cp, par->extradata,
par->extradata_size, 0);
case AV_CODEC_ID_AV1:
if (par->extradata_size)
return ff_isom_write_av1c(dyn_cp, par->extradata,
par->extradata_size);
else
put_ebml_void(pb, 4 + 3);
break;
case AV_CODEC_ID_ALAC:
if (par->extradata_size < 36) {
av_log(s, AV_LOG_ERROR,
"Invalid extradata found, ALAC expects a 36-byte "
"QuickTime atom.");
return AVERROR_INVALIDDATA;
} else
avio_write(dyn_cp, par->extradata + 12,
par->extradata_size - 12);
break;
case AV_CODEC_ID_AAC:
if (par->extradata_size)
avio_write(dyn_cp, par->extradata, par->extradata_size);
else
put_ebml_void(pb, MAX_PCE_SIZE + 2 + 4);
break;
default:
if (par->codec_id == AV_CODEC_ID_PRORES &&
ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == AV_CODEC_ID_PRORES) {
avio_wl32(dyn_cp, par->codec_tag);
} else if (par->extradata_size && par->codec_id != AV_CODEC_ID_TTA)
avio_write(dyn_cp, par->extradata, par->extradata_size);
}
return 0;
}
static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
AVCodecParameters *par,
int native_id, int qt_id)
{
AVIOContext *dyn_cp;
MatroskaMuxContext *mkv = s->priv_data;
uint8_t *codecpriv;
int ret, codecpriv_size;
ret = avio_open_dyn_buf(&dyn_cp);
if (ret < 0)
return ret;
if (native_id) {
ret = mkv_write_native_codecprivate(s, pb, par, dyn_cp);
} else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
if (qt_id) {
if (!par->codec_tag)
par->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
par->codec_id);
if ( ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == par->codec_id
&& (!par->extradata_size || ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(par->extradata + 4)) != par->codec_id)
) {
int i;
avio_wb32(dyn_cp, 0x5a + par->extradata_size);
avio_wl32(dyn_cp, par->codec_tag);
for(i = 0; i < 0x5a - 8; i++)
avio_w8(dyn_cp, 0);
}
avio_write(dyn_cp, par->extradata, par->extradata_size);
} else {
if (!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id))
av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
avcodec_get_name(par->codec_id));
if (!par->codec_tag)
par->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
par->codec_id);
if (!par->codec_tag && par->codec_id != AV_CODEC_ID_RAWVIDEO) {
av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
avcodec_get_name(par->codec_id));
ret = AVERROR(EINVAL);
}
ff_put_bmp_header(dyn_cp, par, 0, 0, mkv->flipped_raw_rgb);
}
} else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
unsigned int tag;
tag = ff_codec_get_tag(ff_codec_wav_tags, par->codec_id);
if (!tag) {
av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
avcodec_get_name(par->codec_id));
ret = AVERROR(EINVAL);
}
if (!par->codec_tag)
par->codec_tag = tag;
ff_put_wav_header(s, dyn_cp, par, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
}
if (ret >= 0) {
codecpriv_size = avio_get_dyn_buf(dyn_cp, &codecpriv);
if ((ret = dyn_cp->error) >= 0 && codecpriv_size)
put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
codecpriv_size);
}
ffio_free_dyn_buf(&dyn_cp);
return ret;
}
static void mkv_write_video_color(AVIOContext *pb, const AVStream *st,
const AVCodecParameters *par)
{
/* 18 Elements with two bytes ID, one byte length field, 8 bytes payload
* a master element with two bytes ID and one byte length field
* plus another byte to stay clear of the end. */
uint8_t colour[(2 + 1 + 8) * 18 + (2 + 1) + 1];
AVIOContext buf, *dyn_cp = &buf;
int colorinfo_size;
const void *side_data;
ffio_init_context(dyn_cp, colour, sizeof(colour), 1, NULL, NULL, NULL, NULL);
if (par->color_trc != AVCOL_TRC_UNSPECIFIED &&
par->color_trc < AVCOL_TRC_NB) {
put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS,
par->color_trc);
}
if (par->color_space != AVCOL_SPC_UNSPECIFIED &&
par->color_space < AVCOL_SPC_NB) {
put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, par->color_space);
}
if (par->color_primaries != AVCOL_PRI_UNSPECIFIED &&
par->color_primaries < AVCOL_PRI_NB) {
put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORPRIMARIES, par->color_primaries);
}
if (par->color_range != AVCOL_RANGE_UNSPECIFIED &&
par->color_range < AVCOL_RANGE_NB) {
put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORRANGE, par->color_range);
}
if (par->chroma_location != AVCHROMA_LOC_UNSPECIFIED &&
par->chroma_location <= AVCHROMA_LOC_TOP) {
int xpos, ypos;
avcodec_enum_to_chroma_pos(&xpos, &ypos, par->chroma_location);
put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, (xpos >> 7) + 1);
put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, (ypos >> 7) + 1);
}
side_data = av_stream_get_side_data(st, AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
NULL);
if (side_data) {
const AVContentLightMetadata *metadata = side_data;
put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMAXCLL, metadata->MaxCLL);
put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMAXFALL, metadata->MaxFALL);
}
side_data = av_stream_get_side_data(st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
NULL);
if (side_data) {
ebml_master meta_element = start_ebml_master(
dyn_cp, MATROSKA_ID_VIDEOCOLORMASTERINGMETA, 10 * (2 + 1 + 8));
const AVMasteringDisplayMetadata *metadata = side_data;
if (metadata->has_primaries) {
put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RX,
av_q2d(metadata->display_primaries[0][0]));
put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RY,
av_q2d(metadata->display_primaries[0][1]));
put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GX,
av_q2d(metadata->display_primaries[1][0]));
put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GY,
av_q2d(metadata->display_primaries[1][1]));
put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BX,
av_q2d(metadata->display_primaries[2][0]));
put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BY,
av_q2d(metadata->display_primaries[2][1]));
put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEX,
av_q2d(metadata->white_point[0]));
put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEY,
av_q2d(metadata->white_point[1]));
}
if (metadata->has_luminance) {
put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX,
av_q2d(metadata->max_luminance));
put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN,
av_q2d(metadata->min_luminance));
}
end_ebml_master(dyn_cp, meta_element);
}
colorinfo_size = avio_tell(dyn_cp);
if (colorinfo_size)
put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLOR, colour, colorinfo_size);
}
static void mkv_write_video_projection(AVFormatContext *s, AVIOContext *pb,
const AVStream *st)
{
ebml_master projection;
uint8_t private[20];
const AVSphericalMapping *spherical =
(const AVSphericalMapping *)av_stream_get_side_data(st, AV_PKT_DATA_SPHERICAL,
NULL);
if (!spherical)
return;
if (spherical->projection != AV_SPHERICAL_EQUIRECTANGULAR &&
spherical->projection != AV_SPHERICAL_EQUIRECTANGULAR_TILE &&
spherical->projection != AV_SPHERICAL_CUBEMAP) {
av_log(s, AV_LOG_WARNING, "Unknown projection type\n");
return;
}
// Maximally 4 8-byte elements with id-length 2 + 1 byte length field
// and the private data of the AV_SPHERICAL_EQUIRECTANGULAR_TILE case
projection = start_ebml_master(pb, MATROSKA_ID_VIDEOPROJECTION,
4 * (2 + 1 + 8) + (2 + 1 + 20));
switch (spherical->projection) {
case AV_SPHERICAL_EQUIRECTANGULAR:
put_ebml_uint(pb, MATROSKA_ID_VIDEOPROJECTIONTYPE,
MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
break;
case AV_SPHERICAL_EQUIRECTANGULAR_TILE:
put_ebml_uint(pb, MATROSKA_ID_VIDEOPROJECTIONTYPE,
MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
AV_WB32(private, 0); // version + flags
AV_WB32(private + 4, spherical->bound_top);
AV_WB32(private + 8, spherical->bound_bottom);
AV_WB32(private + 12, spherical->bound_left);
AV_WB32(private + 16, spherical->bound_right);
put_ebml_binary(pb, MATROSKA_ID_VIDEOPROJECTIONPRIVATE,
private, 20);
break;
case AV_SPHERICAL_CUBEMAP:
put_ebml_uint(pb, MATROSKA_ID_VIDEOPROJECTIONTYPE,
MATROSKA_VIDEO_PROJECTION_TYPE_CUBEMAP);
AV_WB32(private, 0); // version + flags
AV_WB32(private + 4, 0); // layout
AV_WB32(private + 8, spherical->padding);
put_ebml_binary(pb, MATROSKA_ID_VIDEOPROJECTIONPRIVATE,
private, 12);
break;
default:
av_assert0(0);
}
if (spherical->yaw)
put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEYAW,
(double) spherical->yaw / (1 << 16));
if (spherical->pitch)
put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH,
(double) spherical->pitch / (1 << 16));
if (spherical->roll)
put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEROLL,
(double) spherical->roll / (1 << 16));
end_ebml_master(pb, projection);
}
static void mkv_write_field_order(AVIOContext *pb, int mode,
enum AVFieldOrder field_order)
{
switch (field_order) {
case AV_FIELD_UNKNOWN:
break;
case AV_FIELD_PROGRESSIVE:
put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE);
break;
case AV_FIELD_TT:
case AV_FIELD_BB:
case AV_FIELD_TB:
case AV_FIELD_BT:
put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED);
if (mode != MODE_WEBM) {
switch (field_order) {
case AV_FIELD_TT:
put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
MATROSKA_VIDEO_FIELDORDER_TT);
break;
case AV_FIELD_BB:
put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
MATROSKA_VIDEO_FIELDORDER_BB);
break;
case AV_FIELD_TB:
put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
MATROSKA_VIDEO_FIELDORDER_TB);
break;
case AV_FIELD_BT:
put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
MATROSKA_VIDEO_FIELDORDER_BT);
break;
}
}
}
}
static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
AVStream *st, int mode, int *h_width, int *h_height)
{
const AVDictionaryEntry *tag;
MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
const AVStereo3D *stereo;
*h_width = 1;
*h_height = 1;
// convert metadata into proper side data and add it to the stream
if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
(tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
int stereo_mode = atoi(tag->value);
for (int i = 0; i < MATROSKA_VIDEO_STEREOMODE_TYPE_NB; i++)
if (!strcmp(tag->value, ff_matroska_video_stereo_mode[i])){
stereo_mode = i;
break;
}
if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
stereo_mode != 10 && stereo_mode != 12) {
int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
if (ret < 0)
return ret;
}
}
stereo = (const AVStereo3D*)av_stream_get_side_data(st, AV_PKT_DATA_STEREO3D,
NULL);
if (stereo) {
switch (stereo->type) {
case AV_STEREO3D_2D:
format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
break;
case AV_STEREO3D_SIDEBYSIDE:
format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
: MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
*h_width = 2;
break;
case AV_STEREO3D_TOPBOTTOM:
format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
format--;
*h_height = 2;
break;
case AV_STEREO3D_CHECKERBOARD:
format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
format--;
break;
case AV_STEREO3D_LINES:
format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
format--;
*h_height = 2;
break;
case AV_STEREO3D_COLUMNS:
format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
format--;
*h_width = 2;
break;
case AV_STEREO3D_FRAMESEQUENCE:
format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
format++;
break;
}
}
if (format == MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
return 0;
// if webm, do not write unsupported modes
if ((mode == MODE_WEBM &&
format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
|| format >= MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
av_log(s, AV_LOG_ERROR,
"The specified stereo mode is not valid.\n");
return AVERROR(EINVAL);
}
// write StereoMode if format is valid
put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
return 0;
}
static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
AVStream *st, mkv_track *track, AVIOContext *pb,
int is_default)
{
AVCodecParameters *par = st->codecpar;
ebml_master subinfo, track_master;
int native_id = 0;
int qt_id = 0;
int bit_depth;
int sample_rate = par->sample_rate;
int output_sample_rate = 0;
int display_width_div = 1;
int display_height_div = 1;
int j, ret;
const AVDictionaryEntry *tag;
if (par->codec_type == AVMEDIA_TYPE_ATTACHMENT)
return 0;
if (par->codec_id == AV_CODEC_ID_AAC) {
ret = get_aac_sample_rates(s, mkv, par->extradata, par->extradata_size,
&sample_rate, &output_sample_rate);
if (ret < 0)
return ret;
}
track_master = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
put_ebml_uint(pb, MATROSKA_ID_TRACKNUMBER, track->track_num);
put_ebml_uid (pb, MATROSKA_ID_TRACKUID, track->uid);
put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGLACING, 0); // no lacing (yet)
if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
tag = av_dict_get(st->metadata, "language", NULL, 0);
put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE,
tag && tag->value[0] ? tag->value : "und");
// The default value for TRACKFLAGDEFAULT is 1, so add element
// if we need to clear it.
if (!is_default)
put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, 0);
if (st->disposition & AV_DISPOSITION_FORCED)
put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
if (mkv->mode == MODE_WEBM) {
const char *codec_id;
if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
for (j = 0; ff_webm_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
if (ff_webm_codec_tags[j].id == par->codec_id) {
codec_id = ff_webm_codec_tags[j].str;
native_id = 1;
break;
}
}
} else if (par->codec_id == AV_CODEC_ID_WEBVTT) {
if (st->disposition & AV_DISPOSITION_CAPTIONS) {
codec_id = "D_WEBVTT/CAPTIONS";
native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
} else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
codec_id = "D_WEBVTT/DESCRIPTIONS";
native_id = MATROSKA_TRACK_TYPE_METADATA;
} else if (st->disposition & AV_DISPOSITION_METADATA) {
codec_id = "D_WEBVTT/METADATA";
native_id = MATROSKA_TRACK_TYPE_METADATA;
} else {
codec_id = "D_WEBVTT/SUBTITLES";
native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
}
}
if (!native_id) {
av_log(s, AV_LOG_ERROR,
"Only VP8 or VP9 or AV1 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.\n");
return AVERROR(EINVAL);
}
put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
} else {
if (st->disposition & AV_DISPOSITION_COMMENT)
put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGCOMMENTARY, 1);
if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGHEARINGIMPAIRED, 1);
if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGVISUALIMPAIRED, 1);
// look for a codec ID string specific to mkv to use,
// if none are found, use AVI codes
if (par->codec_id != AV_CODEC_ID_RAWVIDEO || par->codec_tag) {
for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
if (ff_mkv_codec_tags[j].id == par->codec_id && par->codec_id != AV_CODEC_ID_FFV1) {
put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
native_id = 1;
break;
}
}
} else {
if (mkv->allow_raw_vfw) {
native_id = 0;
} else {
av_log(s, AV_LOG_ERROR, "Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or\n"
"If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)\n");
return AVERROR(EINVAL);
}
}
}
switch (par->codec_type) {
case AVMEDIA_TYPE_VIDEO:
mkv->have_video = 1;
put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
if( st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0
&& av_cmp_q(av_inv_q(st->avg_frame_rate), st->time_base) > 0)
put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
else if( st->r_frame_rate.num > 0 && st->r_frame_rate.den > 0
&& av_cmp_q(av_inv_q(st->r_frame_rate), st->time_base) > 0)
put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->r_frame_rate.den / st->r_frame_rate.num);
if (!native_id &&
ff_codec_get_tag(ff_codec_movvideo_tags, par->codec_id) &&
((!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id) && par->codec_id != AV_CODEC_ID_RAWVIDEO) ||
par->codec_id == AV_CODEC_ID_SVQ1 ||
par->codec_id == AV_CODEC_ID_SVQ3 ||
par->codec_id == AV_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, "V_MS/VFW/FOURCC");
track->write_dts = 1;
s->internal->avoid_negative_ts_use_pts = 0;
}
subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , par->width);
put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, par->height);
mkv_write_field_order(pb, mkv->mode, par->field_order);
// check both side data and metadata for stereo information,
// write the result to the bitstream if any is found
ret = mkv_write_stereo_mode(s, pb, st, mkv->mode,
&display_width_div,
&display_height_div);
if (ret < 0)
return ret;
if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
(par->format == AV_PIX_FMT_YUVA420P)) {
put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
}
// write DisplayWidth and DisplayHeight, they contain the size of
// a single source view and/or the display aspect ratio
if (st->sample_aspect_ratio.num) {
int64_t d_width = av_rescale(par->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
if (d_width > INT_MAX) {
av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
return AVERROR(EINVAL);
}
if (d_width != par->width || display_width_div != 1 || display_height_div != 1) {
if (mkv->mode == MODE_WEBM || display_width_div != 1 || display_height_div != 1) {
put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
} else {
AVRational display_aspect_ratio;
av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
par->width * (int64_t)st->sample_aspect_ratio.num,
par->height * (int64_t)st->sample_aspect_ratio.den,
1024 * 1024);
put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH, display_aspect_ratio.num);
put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, display_aspect_ratio.den);
put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_DAR);
}
}
} else if (display_width_div != 1 || display_height_div != 1) {
put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , par->width / display_width_div);
put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
} else if (mkv->mode != MODE_WEBM)
put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN);
if (par->codec_id == AV_CODEC_ID_RAWVIDEO) {
uint32_t color_space = av_le2ne32(par->codec_tag);
put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
}
mkv_write_video_color(pb, st, par);
mkv_write_video_projection(s, pb, st);
end_ebml_master(pb, subinfo);
break;
case AVMEDIA_TYPE_AUDIO:
if (par->initial_padding && par->codec_id == AV_CODEC_ID_OPUS) {
int64_t codecdelay = av_rescale_q(par->initial_padding,
(AVRational){ 1, 48000 },
(AVRational){ 1, 1000000000 });
if (codecdelay < 0) {
av_log(s, AV_LOG_ERROR, "Initial padding is invalid\n");
return AVERROR(EINVAL);
}
// track->ts_offset = av_rescale_q(par->initial_padding,
// (AVRational){ 1, par->sample_rate },
// st->time_base);
put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codecdelay);
}
if (par->codec_id == AV_CODEC_ID_OPUS)
put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
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, "A_MS/ACM");
subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 6 + 4 * 9);
put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , par->channels);
track->sample_rate_offset = avio_tell(pb);
put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
if (output_sample_rate)
put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
bit_depth = av_get_bits_per_sample(par->codec_id);
if (!bit_depth && par->codec_id != AV_CODEC_ID_ADPCM_G726) {
if (par->bits_per_raw_sample)
bit_depth = par->bits_per_raw_sample;
else
bit_depth = av_get_bytes_per_sample(par->format) << 3;
}
if (!bit_depth)
bit_depth = par->bits_per_coded_sample;
if (bit_depth)
put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
end_ebml_master(pb, subinfo);
break;
case AVMEDIA_TYPE_SUBTITLE:
if (!native_id) {
av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", par->codec_id);
return AVERROR(ENOSYS);
}
if (mkv->mode != MODE_WEBM && st->disposition & AV_DISPOSITION_DESCRIPTIONS)
put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGTEXTDESCRIPTIONS, 1);
if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT)
native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
break;
default:
av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
return AVERROR(EINVAL);
}
if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
track->codecpriv_offset = avio_tell(pb);
ret = mkv_write_codecprivate(s, pb, par, native_id, qt_id);
if (ret < 0)
return ret;
}
end_ebml_master(pb, track_master);
return 0;
}
static int mkv_write_tracks(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
AVIOContext *pb = s->pb;
int i, ret, video_default_idx, audio_default_idx, subtitle_default_idx;
if (mkv->nb_attachments == s->nb_streams)
return 0;
ret = start_ebml_master_crc32(&mkv->track.bc, mkv);
if (ret < 0)
return ret;
if (mkv->default_mode != DEFAULT_MODE_PASSTHROUGH) {
int video_idx, audio_idx, subtitle_idx;
video_idx = video_default_idx =
audio_idx = audio_default_idx =
subtitle_idx = subtitle_default_idx = -1;
for (i = s->nb_streams - 1; i >= 0; i--) {
AVStream *st = s->streams[i];
switch (st->codecpar->codec_type) {
#define CASE(type, variable) \
case AVMEDIA_TYPE_ ## type: \
variable ## _idx = i; \
if (st->disposition & AV_DISPOSITION_DEFAULT) \
variable ## _default_idx = i; \
break;
CASE(VIDEO, video)
CASE(AUDIO, audio)
CASE(SUBTITLE, subtitle)
#undef CASE
}
}
video_default_idx = FFMAX(video_default_idx, video_idx);
audio_default_idx = FFMAX(audio_default_idx, audio_idx);
if (mkv->default_mode != DEFAULT_MODE_INFER_NO_SUBS)
subtitle_default_idx = FFMAX(subtitle_default_idx, subtitle_idx);
}
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
int is_default = mkv->default_mode == DEFAULT_MODE_PASSTHROUGH ?
st->disposition & AV_DISPOSITION_DEFAULT :
i == video_default_idx || i == audio_default_idx ||
i == subtitle_default_idx;
ret = mkv_write_track(s, mkv, st, &mkv->tracks[i],
mkv->track.bc, is_default);
if (ret < 0)
return ret;
}
return end_ebml_master_crc32_tentatively(pb, &mkv->track, mkv,
MATROSKA_ID_TRACKS);
}
static int mkv_write_simpletag(AVIOContext *pb, const AVDictionaryEntry *t)
{
uint8_t *key = av_strdup(t->key);
uint8_t *p = key;
const uint8_t *lang = NULL;
ebml_master tag;
if (!key)
return AVERROR(ENOMEM);
if ((p = strrchr(p, '-')) &&
(lang = ff_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
*p = 0;
p = key;
while (*p) {
if (*p == ' ')
*p = '_';
else if (*p >= 'a' && *p <= 'z')
*p -= 'a' - 'A';
p++;
}
tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
if (lang)
put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
end_ebml_master(pb, tag);
av_freep(&key);
return 0;
}
static int mkv_write_tag_targets(MatroskaMuxContext *mkv, AVIOContext **pb,
ebml_master *tag, uint32_t elementid, uint64_t uid)
{
ebml_master targets;
int ret;
if (!*pb) {
ret = start_ebml_master_crc32(pb, mkv);
if (ret < 0)
return ret;
}
*tag = start_ebml_master(*pb, MATROSKA_ID_TAG, 0);
targets = start_ebml_master(*pb, MATROSKA_ID_TAGTARGETS, 4 + 1 + 8);
if (elementid)
put_ebml_uid(*pb, elementid, uid);
end_ebml_master(*pb, targets);
return 0;
}
static int mkv_check_tag_name(const char *name, uint32_t elementid)
{
return av_strcasecmp(name, "title") &&
av_strcasecmp(name, "stereo_mode") &&
av_strcasecmp(name, "creation_time") &&
av_strcasecmp(name, "encoding_tool") &&
av_strcasecmp(name, "duration") &&
(elementid != MATROSKA_ID_TAGTARGETS_TRACKUID ||
av_strcasecmp(name, "language")) &&
(elementid != MATROSKA_ID_TAGTARGETS_ATTACHUID ||
(av_strcasecmp(name, "filename") &&
av_strcasecmp(name, "mimetype")));
}
static int mkv_write_tag(MatroskaMuxContext *mkv, const AVDictionary *m,
AVIOContext **pb, ebml_master *tag,
uint32_t elementid, uint64_t uid)
{
const AVDictionaryEntry *t = NULL;
ebml_master tag2;
int ret;
ret = mkv_write_tag_targets(mkv, pb, tag ? tag : &tag2, elementid, uid);
if (ret < 0)
return ret;
while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
if (mkv_check_tag_name(t->key, elementid)) {
ret = mkv_write_simpletag(*pb, t);
if (ret < 0)
return ret;
}
}
if (!tag)
end_ebml_master(*pb, tag2);
return 0;
}
static int mkv_check_tag(const AVDictionary *m, uint32_t elementid)
{
const AVDictionaryEntry *t = NULL;
while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
if (mkv_check_tag_name(t->key, elementid))
return 1;
return 0;
}
static int mkv_write_tags(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
ebml_master tag, *tagp = IS_SEEKABLE(s->pb, mkv) ? &tag : NULL;
int i, ret;
mkv->wrote_tags = 1;
ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
if (mkv_check_tag(s->metadata, 0)) {
ret = mkv_write_tag(mkv, s->metadata, &mkv->tags.bc, NULL, 0, 0);
if (ret < 0)
return ret;
}
for (i = 0; i < s->nb_streams; i++) {
const AVStream *st = s->streams[i];
mkv_track *track = &mkv->tracks[i];
if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
continue;
if (!tagp && !mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID))
continue;
ret = mkv_write_tag(mkv, st->metadata, &mkv->tags.bc, tagp,
MATROSKA_ID_TAGTARGETS_TRACKUID, track->uid);
if (ret < 0)
return ret;
if (tagp) {
AVIOContext *pb = mkv->tags.bc;
ebml_master simpletag;
simpletag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG,
2 + 1 + 8 + 23);
put_ebml_string(pb, MATROSKA_ID_TAGNAME, "DURATION");
track->duration_offset = avio_tell(pb);
// Reserve space to write duration as a 20-byte string.
// 2 (ebml id) + 1 (data size) + 20 (data)
put_ebml_void(pb, 23);
end_ebml_master(pb, simpletag);
end_ebml_master(pb, tag);
}
}
if (mkv->nb_attachments && mkv->mode != MODE_WEBM) {
for (i = 0; i < s->nb_streams; i++) {
const mkv_track *track = &mkv->tracks[i];
const AVStream *st = s->streams[i];
if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
continue;
if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID))
continue;
ret = mkv_write_tag(mkv, st->metadata, &mkv->tags.bc, NULL,
MATROSKA_ID_TAGTARGETS_ATTACHUID, track->uid);
if (ret < 0)
return ret;
}
}
if (mkv->tags.bc) {
return end_ebml_master_crc32_tentatively(s->pb, &mkv->tags, mkv,
MATROSKA_ID_TAGS);
}
return 0;
}
static int mkv_write_chapters(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
AVIOContext *dyn_cp = NULL, *dyn_tags = NULL, **tags, *pb = s->pb;
ebml_master editionentry;
uint64_t chapter_id_offset = 0;
AVRational scale = {1, 1E9};
int i, ret;
if (!s->nb_chapters || mkv->wrote_chapters)
return 0;
for (i = 0; i < s->nb_chapters; i++)
if (!s->chapters[i]->id) {
chapter_id_offset = 1;
break;
}
ret = start_ebml_master_crc32(&dyn_cp, mkv);
if (ret < 0)
return ret;
editionentry = start_ebml_master(dyn_cp, MATROSKA_ID_EDITIONENTRY, 0);
if (mkv->mode != MODE_WEBM) {
put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
/* If mkv_write_tags() has already been called, then any tags
* corresponding to chapters will be put into a new Tags element. */
tags = mkv->wrote_tags ? &dyn_tags : &mkv->tags.bc;
} else
tags = NULL;
for (i = 0; i < s->nb_chapters; i++) {
ebml_master chapteratom, chapterdisplay;
const AVChapter *c = s->chapters[i];
int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
const AVDictionaryEntry *t;
if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
av_log(s, AV_LOG_ERROR,
"Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
chapterstart, chapterend);
ret = AVERROR_INVALIDDATA;
goto fail;
}
chapteratom = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERATOM, 0);
put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERUID,
(uint32_t)c->id + chapter_id_offset);
put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
chapterdisplay = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERDISPLAY, 0);
put_ebml_string(dyn_cp, MATROSKA_ID_CHAPSTRING, t->value);
put_ebml_string(dyn_cp, MATROSKA_ID_CHAPLANG , "und");
end_ebml_master(dyn_cp, chapterdisplay);
}
end_ebml_master(dyn_cp, chapteratom);
if (tags && mkv_check_tag(c->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID)) {
ret = mkv_write_tag(mkv, c->metadata, tags, NULL,
MATROSKA_ID_TAGTARGETS_CHAPTERUID,
(uint32_t)c->id + chapter_id_offset);
if (ret < 0)
goto fail;
}
}
end_ebml_master(dyn_cp, editionentry);
mkv->wrote_chapters = 1;
ret = end_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_CHAPTERS, 0, 0, 1);
if (ret < 0)
goto fail;
if (dyn_tags)
return end_ebml_master_crc32(pb, &dyn_tags, mkv,
MATROSKA_ID_TAGS, 0, 0, 1);
return 0;
fail:
if (tags) {
/* tags == &mkv->tags.bc can only happen if mkv->tags.bc was
* initially NULL, so we never free older tags. */
ffio_free_dyn_buf(tags);
}
ffio_free_dyn_buf(&dyn_cp);
return ret;
}
static const char *get_mimetype(const AVStream *st)
{
const AVDictionaryEntry *t;
if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
return t->value;
if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
const AVCodecDescriptor *desc = avcodec_descriptor_get(st->codecpar->codec_id);
if (desc && desc->mime_types) {
return desc->mime_types[0];
} else if (st->codecpar->codec_id == AV_CODEC_ID_TEXT)
return "text/plain";
}
return NULL;
}
static int mkv_write_attachments(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
AVIOContext *dyn_cp = NULL, *pb = s->pb;
int i, ret;
if (!mkv->nb_attachments)
return 0;
ret = start_ebml_master_crc32(&dyn_cp, mkv);
if (ret < 0)
return ret;
for (i = 0; i < s->nb_streams; i++) {
const AVStream *st = s->streams[i];
mkv_track *track = &mkv->tracks[i];
ebml_master attached_file;
const AVDictionaryEntry *t;
const char *mimetype;
if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
continue;
attached_file = start_ebml_master(dyn_cp, MATROSKA_ID_ATTACHEDFILE, 0);
if (t = av_dict_get(st->metadata, "title", NULL, 0))
put_ebml_string(dyn_cp, MATROSKA_ID_FILEDESC, t->value);
if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
return AVERROR(EINVAL);
}
put_ebml_string(dyn_cp, MATROSKA_ID_FILENAME, t->value);
mimetype = get_mimetype(st);
av_assert0(mimetype);
put_ebml_string(dyn_cp, MATROSKA_ID_FILEMIMETYPE, mimetype);
put_ebml_binary(dyn_cp, MATROSKA_ID_FILEDATA, st->codecpar->extradata, st->codecpar->extradata_size);
put_ebml_uid(dyn_cp, MATROSKA_ID_FILEUID, track->uid);
end_ebml_master(dyn_cp, attached_file);
}
return end_ebml_master_crc32(pb, &dyn_cp, mkv,
MATROSKA_ID_ATTACHMENTS, 0, 0, 1);
}
static int64_t get_metadata_duration(AVFormatContext *s)
{
const AVDictionaryEntry *duration = av_dict_get(s->metadata, "DURATION",
NULL, 0);
int64_t max = 0;
int64_t us;
if (duration && (av_parse_time(&us, duration->value, 1) == 0) && us > 0) {
av_log(s, AV_LOG_DEBUG, "get_metadata_duration found duration in context metadata: %" PRId64 "\n", us);
return us;
}
for (unsigned i = 0; i < s->nb_streams; i++) {
int64_t us;
duration = av_dict_get(s->streams[i]->metadata, "DURATION", NULL, 0);
if (duration && (av_parse_time(&us, duration->value, 1) == 0))
max = FFMAX(max, us);
}
av_log(s, AV_LOG_DEBUG, "get_metadata_duration returned: %" PRId64 "\n", max);
return max;
}
static int mkv_write_header(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
AVIOContext *pb = s->pb;
ebml_master ebml_header;
const AVDictionaryEntry *tag;
int ret, i, version = 2;
int64_t creation_time;
if (mkv->mode != MODE_WEBM ||
av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
av_dict_get(s->metadata, "alpha_mode", NULL, 0))
version = 4;
for (i = 0; i < s->nb_streams; i++) {
if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_OPUS ||
av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
version = 4;
}
ebml_header = start_ebml_master(pb, EBML_ID_HEADER, MAX_EBML_HEADER_SIZE);
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 , s->oformat->name);
put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION, 2);
end_ebml_master(pb, ebml_header);
put_ebml_id(pb, MATROSKA_ID_SEGMENT);
put_ebml_size_unknown(pb, 8);
mkv->segment_offset = avio_tell(pb);
// We write a SeekHead at the beginning to point to all other level
// one elements (except Clusters).
mkv_start_seekhead(mkv, pb);
ret = start_ebml_master_crc32(&mkv->info.bc, mkv);
if (ret < 0)
return ret;
pb = mkv->info.bc;
put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
else
put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
if (mkv->mode != MODE_WEBM)
put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, mkv->segment_uid, 16);
} else {
const char *ident = "Lavf";
put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
}
if (ff_parse_creation_time_metadata(s, &creation_time, 0) > 0) {
// Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
int64_t date_utc = (creation_time - 978307200000000LL) * 1000;
uint8_t date_utc_buf[8];
AV_WB64(date_utc_buf, date_utc);
put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
}
// reserve space for the duration
mkv->duration = 0;
mkv->duration_offset = avio_tell(pb);
if (!mkv->is_live) {
int64_t metadata_duration = get_metadata_duration(s);
if (s->duration > 0) {
int64_t scaledDuration = av_rescale(s->duration, 1000, AV_TIME_BASE);
put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
av_log(s, AV_LOG_DEBUG, "Write early duration from recording time = %" PRIu64 "\n", scaledDuration);
} else if (metadata_duration > 0) {
int64_t scaledDuration = av_rescale(metadata_duration, 1000, AV_TIME_BASE);
put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
av_log(s, AV_LOG_DEBUG, "Write early duration from metadata = %" PRIu64 "\n", scaledDuration);
} else if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
put_ebml_void(pb, 11); // assumes double-precision float to be written
}
}
ret = end_ebml_master_crc32_tentatively(s->pb, &mkv->info,
mkv, MATROSKA_ID_INFO);
if (ret < 0)
return ret;
pb = s->pb;
ret = mkv_write_tracks(s);
if (ret < 0)
return ret;
ret = mkv_write_chapters(s);
if (ret < 0)
return ret;
if (mkv->mode != MODE_WEBM) {
ret = mkv_write_attachments(s);
if (ret < 0)
return ret;
}
/* Must come after mkv_write_chapters() to write chapter tags
* into the same Tags element as the other tags. */
ret = mkv_write_tags(s);
if (ret < 0)
return ret;
if (!IS_SEEKABLE(pb, mkv)) {
ret = mkv_write_seekhead(pb, mkv, 0, avio_tell(pb));
if (ret < 0)
return ret;
}
if (s->metadata_header_padding > 0) {
if (s->metadata_header_padding == 1)
s->metadata_header_padding++;
put_ebml_void(pb, s->metadata_header_padding);
}
if (mkv->reserve_cues_space) {
if (IS_SEEKABLE(pb, mkv)) {
mkv->cues_pos = avio_tell(pb);
if (mkv->reserve_cues_space == 1)
mkv->reserve_cues_space++;
put_ebml_void(pb, mkv->reserve_cues_space);
} else
mkv->reserve_cues_space = -1;
}
av_init_packet(&mkv->cur_audio_pkt);
mkv->cur_audio_pkt.size = 0;
mkv->cluster_pos = -1;
// start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
// after 4k and on a keyframe
if (IS_SEEKABLE(pb, mkv)) {
if (mkv->cluster_time_limit < 0)
mkv->cluster_time_limit = 5000;
if (mkv->cluster_size_limit < 0)
mkv->cluster_size_limit = 5 * 1024 * 1024;
} else {
if (mkv->cluster_time_limit < 0)
mkv->cluster_time_limit = 1000;
if (mkv->cluster_size_limit < 0)
mkv->cluster_size_limit = 32 * 1024;
}
return 0;
}
static int mkv_blockgroup_size(int pkt_size, int track_num_size)
{
int size = pkt_size + track_num_size + 3;
size += ebml_length_size(size);
size += 2; // EBML ID for block and block duration
size += 9; // max size of block duration incl. length field
return size;
}
static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
{
uint8_t *dst;
int srclen = *size;
int offset = 0;
int ret;
dst = av_malloc(srclen);
if (!dst)
return AVERROR(ENOMEM);
while (srclen >= WV_HEADER_SIZE) {
WvHeader header;
ret = ff_wv_parse_header(&header, src);
if (ret < 0)
goto fail;
src += WV_HEADER_SIZE;
srclen -= WV_HEADER_SIZE;
if (srclen < header.blocksize) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
if (header.initial) {
AV_WL32(dst + offset, header.samples);
offset += 4;
}
AV_WL32(dst + offset, header.flags);
AV_WL32(dst + offset + 4, header.crc);
offset += 8;
if (!(header.initial && header.final)) {
AV_WL32(dst + offset, header.blocksize);
offset += 4;
}
memcpy(dst + offset, src, header.blocksize);
src += header.blocksize;
srclen -= header.blocksize;
offset += header.blocksize;
}
*pdst = dst;
*size = offset;
return 0;
fail:
av_freep(&dst);
return ret;
}
static int mkv_write_block(AVFormatContext *s, AVIOContext *pb,
uint32_t blockid, const AVPacket *pkt, int keyframe)
{
MatroskaMuxContext *mkv = s->priv_data;
AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
mkv_track *track = &mkv->tracks[pkt->stream_index];
uint8_t *data = NULL, *side_data = NULL;
int err = 0, offset = 0, size = pkt->size, side_data_size;
int64_t ts = track->write_dts ? pkt->dts : pkt->pts;
uint64_t additional_id;
int64_t discard_padding = 0;
unsigned track_number = track->track_num;
ebml_master block_group, block_additions, block_more;
ts += track->ts_offset;
/* The following string is identical to the one in mkv_write_vtt_blocks
* so that only one copy needs to exist in binaries. */
av_log(s, AV_LOG_DEBUG,
"Writing block of size %d with pts %" PRId64 ", dts %" PRId64 ", "
"duration %" PRId64 " at relative offset %" PRId64 " in cluster "
"at offset %" PRId64 ". TrackNumber %u, keyframe %d\n",
pkt->size, pkt->pts, pkt->dts, pkt->duration, avio_tell(pb),
mkv->cluster_pos, track_number, keyframe != 0);
if (par->codec_id == AV_CODEC_ID_H264 && par->extradata_size > 0 &&
(AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1)) {
err = ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
} else if (par->codec_id == AV_CODEC_ID_HEVC && par->extradata_size > 6 &&
(AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1)) {
/* extradata is Annex B, assume the bitstream is too and convert it */
err = ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
} else if (par->codec_id == AV_CODEC_ID_AV1) {
err = ff_av1_filter_obus_buf(pkt->data, &data, &size, &offset);
} else if (par->codec_id == AV_CODEC_ID_WAVPACK) {
err = mkv_strip_wavpack(pkt->data, &data, &size);
} else
data = pkt->data;
if (err < 0) {
av_log(s, AV_LOG_ERROR, "Error when reformatting data of "
"a packet from stream %d.\n", pkt->stream_index);
return err;
}
if (par->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
/* Matroska specification requires to remove the first QuickTime atom
*/
size -= 8;
offset = 8;
}
side_data = av_packet_get_side_data(pkt,
AV_PKT_DATA_SKIP_SAMPLES,
&side_data_size);
if (side_data && side_data_size >= 10) {
discard_padding = av_rescale_q(AV_RL32(side_data + 4),
(AVRational){1, par->sample_rate},
(AVRational){1, 1000000000});
}
side_data = av_packet_get_side_data(pkt,
AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
&side_data_size);
if (side_data) {
// Only the Codec-specific BlockMore (id == 1) is currently supported.
if (side_data_size < 8 || (additional_id = AV_RB64(side_data)) != 1) {
side_data_size = 0;
} else {
side_data += 8;
side_data_size -= 8;
}
}
if (side_data_size || discard_padding) {
block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
blockid = MATROSKA_ID_BLOCK;
}
put_ebml_id(pb, blockid);
put_ebml_length(pb, size + track->track_num_size + 3, 0);
put_ebml_num(pb, track_number, track->track_num_size);
avio_wb16(pb, ts - mkv->cluster_pts);
avio_w8(pb, (blockid == MATROSKA_ID_SIMPLEBLOCK && keyframe) ? (1 << 7) : 0);
avio_write(pb, data + offset, size);
if (data != pkt->data)
av_free(data);
if (blockid == MATROSKA_ID_BLOCK && !keyframe)
put_ebml_sint(pb, MATROSKA_ID_BLOCKREFERENCE, track->last_timestamp - ts);
track->last_timestamp = ts;
if (discard_padding)
put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
if (side_data_size) {
block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
/* Until dbc50f8a our demuxer used a wrong default value
* of BlockAddID, so we write it unconditionally. */
put_ebml_uint (pb, MATROSKA_ID_BLOCKADDID, additional_id);
put_ebml_binary(pb, MATROSKA_ID_BLOCKADDITIONAL,
side_data, side_data_size);
end_ebml_master(pb, block_more);
end_ebml_master(pb, block_additions);
}
if (side_data_size || discard_padding)
end_ebml_master(pb, block_group);
return 0;
}
static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, const AVPacket *pkt)
{
MatroskaMuxContext *mkv = s->priv_data;
mkv_track *track = &mkv->tracks[pkt->stream_index];
ebml_master blockgroup;
int id_size, settings_size, size;
const char *id, *settings;
int64_t ts = track->write_dts ? pkt->dts : pkt->pts;
const int flags = 0;
id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
&id_size);
id = id ? id : "";
settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
&settings_size);
settings = settings ? settings : "";
size = id_size + 1 + settings_size + 1 + pkt->size;
/* The following string is identical to the one in mkv_write_block so that
* only one copy needs to exist in binaries. */
av_log(s, AV_LOG_DEBUG,
"Writing block of size %d with pts %" PRId64 ", dts %" PRId64 ", "
"duration %" PRId64 " at relative offset %" PRId64 " in cluster "
"at offset %" PRId64 ". TrackNumber %u, keyframe %d\n",
size, pkt->pts, pkt->dts, pkt->duration, avio_tell(pb),
mkv->cluster_pos, track->track_num, 1);
blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
mkv_blockgroup_size(size, track->track_num_size));
put_ebml_id(pb, MATROSKA_ID_BLOCK);
put_ebml_length(pb, size + track->track_num_size + 3, 0);
put_ebml_num(pb, track->track_num, track->track_num_size);
avio_wb16(pb, ts - mkv->cluster_pts);
avio_w8(pb, flags);
avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
end_ebml_master(pb, blockgroup);
return pkt->duration;
}
static int mkv_end_cluster(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
int ret;
if (!mkv->have_video) {
for (unsigned i = 0; i < s->nb_streams; i++)
mkv->tracks[i].has_cue = 0;
}
mkv->cluster_pos = -1;
ret = end_ebml_master_crc32(s->pb, &mkv->cluster_bc, mkv,
MATROSKA_ID_CLUSTER, 0, 1, 0);
if (ret < 0)
return ret;
avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_FLUSH_POINT);
return 0;
}
static int mkv_check_new_extra_data(AVFormatContext *s, const AVPacket *pkt)
{
MatroskaMuxContext *mkv = s->priv_data;
mkv_track *track = &mkv->tracks[pkt->stream_index];
AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
uint8_t *side_data;
int side_data_size, ret;
side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
&side_data_size);
switch (par->codec_id) {
case AV_CODEC_ID_AAC:
if (side_data_size && mkv->track.bc) {
int filler, output_sample_rate = 0;
ret = get_aac_sample_rates(s, mkv, side_data, side_data_size,
&track->sample_rate, &output_sample_rate);
if (ret < 0)
return ret;
if (!output_sample_rate)
output_sample_rate = track->sample_rate; // Space is already reserved, so it's this or a void element.
ret = ff_alloc_extradata(par, side_data_size);
if (ret < 0)
return ret;
memcpy(par->extradata, side_data, side_data_size);
avio_seek(mkv->track.bc, track->codecpriv_offset, SEEK_SET);
mkv_write_codecprivate(s, mkv->track.bc, par, 1, 0);
filler = MAX_PCE_SIZE + 2 + 4 - (avio_tell(mkv->track.bc) - track->codecpriv_offset);
if (filler)
put_ebml_void(mkv->track.bc, filler);
avio_seek(mkv->track.bc, track->sample_rate_offset, SEEK_SET);
put_ebml_float(mkv->track.bc, MATROSKA_ID_AUDIOSAMPLINGFREQ, track->sample_rate);
put_ebml_float(mkv->track.bc, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
} else if (!par->extradata_size && !track->sample_rate) {
// No extradata (codecpar or packet side data).
av_log(s, AV_LOG_ERROR, "Error parsing AAC extradata, unable to determine samplerate.\n");
return AVERROR(EINVAL);
}
break;
case AV_CODEC_ID_FLAC:
if (side_data_size && mkv->track.bc) {
uint8_t *old_extradata = par->extradata;
if (side_data_size != par->extradata_size) {
av_log(s, AV_LOG_ERROR, "Invalid FLAC STREAMINFO metadata for output stream %d\n",
pkt->stream_index);
return AVERROR(EINVAL);
}
par->extradata = side_data;
avio_seek(mkv->track.bc, track->codecpriv_offset, SEEK_SET);
mkv_write_codecprivate(s, mkv->track.bc, par, 1, 0);
par->extradata = old_extradata;
}
break;
// FIXME: Remove the following once libaom starts propagating extradata during init()
// See https://bugs.chromium.org/p/aomedia/issues/detail?id=2012
case AV_CODEC_ID_AV1:
if (side_data_size && mkv->track.bc && !par->extradata_size) {
AVIOContext *dyn_cp;
uint8_t *codecpriv;
int codecpriv_size;
ret = avio_open_dyn_buf(&dyn_cp);
if (ret < 0)
return ret;
ff_isom_write_av1c(dyn_cp, side_data, side_data_size);
codecpriv_size = avio_get_dyn_buf(dyn_cp, &codecpriv);
if ((ret = dyn_cp->error) < 0 ||
!codecpriv_size && (ret = AVERROR_INVALIDDATA)) {
ffio_free_dyn_buf(&dyn_cp);
return ret;
}
avio_seek(mkv->track.bc, track->codecpriv_offset, SEEK_SET);
// Do not write the OBUs as we don't have space saved for them
put_ebml_binary(mkv->track.bc, MATROSKA_ID_CODECPRIVATE, codecpriv, 4);
ffio_free_dyn_buf(&dyn_cp);
ret = ff_alloc_extradata(par, side_data_size);
if (ret < 0)
return ret;
memcpy(par->extradata, side_data, side_data_size);
} else if (!par->extradata_size)
return AVERROR_INVALIDDATA;
break;
default:
if (side_data_size)
av_log(s, AV_LOG_DEBUG, "Ignoring new extradata in a packet for stream %d.\n", pkt->stream_index);
break;
}
return 0;
}
static int mkv_write_packet_internal(AVFormatContext *s, const AVPacket *pkt)
{
MatroskaMuxContext *mkv = s->priv_data;
AVIOContext *pb;
AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
mkv_track *track = &mkv->tracks[pkt->stream_index];
int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
int duration = pkt->duration;
int ret;
int64_t ts = track->write_dts ? pkt->dts : pkt->pts;
int64_t relative_packet_pos;
if (ts == AV_NOPTS_VALUE) {
av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
return AVERROR(EINVAL);
}
ts += track->ts_offset;
if (mkv->cluster_pos != -1) {
int64_t cluster_time = ts - mkv->cluster_pts;
if ((int16_t)cluster_time != cluster_time) {
ret = mkv_end_cluster(s);
if (ret < 0)
return ret;
av_log(s, AV_LOG_WARNING, "Starting new cluster due to timestamp\n");
}
}
if (mkv->cluster_pos == -1) {
ret = start_ebml_master_crc32(&mkv->cluster_bc, mkv);
if (ret < 0)
return ret;
mkv->cluster_pos = avio_tell(s->pb);
put_ebml_uint(mkv->cluster_bc, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
mkv->cluster_pts = FFMAX(0, ts);
av_log(s, AV_LOG_DEBUG,
"Starting new cluster with timestamp "
"%" PRId64 " at offset %" PRId64 " bytes\n",
mkv->cluster_pts, mkv->cluster_pos);
}
pb = mkv->cluster_bc;
relative_packet_pos = avio_tell(pb);
if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
ret = mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe);
if (ret < 0)
return ret;
if (keyframe && IS_SEEKABLE(s->pb, mkv) &&
(par->codec_type == AVMEDIA_TYPE_VIDEO || !mkv->have_video && !track->has_cue)) {
ret = mkv_add_cuepoint(mkv, pkt->stream_index, ts,
mkv->cluster_pos, relative_packet_pos, -1);
if (ret < 0)
return ret;
track->has_cue = 1;
}
} else {
if (par->codec_id == AV_CODEC_ID_WEBVTT) {
duration = mkv_write_vtt_blocks(s, pb, pkt);
} else {
ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
mkv_blockgroup_size(pkt->size,
track->track_num_size));
#if FF_API_CONVERGENCE_DURATION
FF_DISABLE_DEPRECATION_WARNINGS
/* For backward compatibility, prefer convergence_duration. */
if (pkt->convergence_duration > 0) {
duration = pkt->convergence_duration;
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
/* All subtitle blocks are considered to be keyframes. */
mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 1);
put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
end_ebml_master(pb, blockgroup);
}
if (IS_SEEKABLE(s->pb, mkv)) {
ret = mkv_add_cuepoint(mkv, pkt->stream_index, ts,
mkv->cluster_pos, relative_packet_pos, duration);
if (ret < 0)
return ret;
}
}
mkv->duration = FFMAX(mkv->duration, ts + duration);
track->duration = FFMAX(track->duration, ts + duration);
return 0;
}
static int mkv_write_packet(AVFormatContext *s, const AVPacket *pkt)
{
MatroskaMuxContext *mkv = s->priv_data;
int codec_type = s->streams[pkt->stream_index]->codecpar->codec_type;
int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
int cluster_size;
int64_t cluster_time;
int ret;
int start_new_cluster;
ret = mkv_check_new_extra_data(s, pkt);
if (ret < 0)
return ret;
if (mkv->cluster_pos != -1) {
if (mkv->tracks[pkt->stream_index].write_dts)
cluster_time = pkt->dts - mkv->cluster_pts;
else
cluster_time = pkt->pts - mkv->cluster_pts;
cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
cluster_size = avio_tell(mkv->cluster_bc);
if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
// WebM DASH specification states that the first block of
// every Cluster has to be a key frame. So for DASH video,
// we only create a Cluster on seeing key frames.
start_new_cluster = keyframe;
} else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
cluster_time > mkv->cluster_time_limit) {
// For DASH audio, we create a Cluster based on cluster_time_limit.
start_new_cluster = 1;
} else if (!mkv->is_dash &&
(cluster_size > mkv->cluster_size_limit ||
cluster_time > mkv->cluster_time_limit ||
(codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
cluster_size > 4 * 1024))) {
start_new_cluster = 1;
} else
start_new_cluster = 0;
if (start_new_cluster) {
ret = mkv_end_cluster(s);
if (ret < 0)
return ret;
}
}
if (!mkv->cluster_pos)
avio_write_marker(s->pb,
av_rescale_q(pkt->dts, s->streams[pkt->stream_index]->time_base, AV_TIME_BASE_Q),
keyframe && (mkv->have_video ? codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
// check if we have an audio packet cached
if (mkv->cur_audio_pkt.size > 0) {
ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
av_packet_unref(&mkv->cur_audio_pkt);
if (ret < 0) {
av_log(s, AV_LOG_ERROR,
"Could not write cached audio packet ret:%d\n", ret);
return ret;
}
}
// buffer an audio packet to ensure the packet containing the video
// keyframe's timecode is contained in the same cluster for WebM
if (codec_type == AVMEDIA_TYPE_AUDIO) {
if (pkt->size > 0)
ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
} else
ret = mkv_write_packet_internal(s, pkt);
return ret;
}
static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
{
MatroskaMuxContext *mkv = s->priv_data;
if (!pkt) {
if (mkv->cluster_pos != -1) {
int ret = mkv_end_cluster(s);
if (ret < 0)
return ret;
av_log(s, AV_LOG_DEBUG,
"Flushing cluster at offset %" PRIu64 " bytes\n",
avio_tell(s->pb));
}
return 1;
}
return mkv_write_packet(s, pkt);
}
static int mkv_write_trailer(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
AVIOContext *pb = s->pb;
int64_t endpos, ret64;
int ret, ret2 = 0;
// check if we have an audio packet cached
if (mkv->cur_audio_pkt.size > 0) {
ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
if (ret < 0) {
av_log(s, AV_LOG_ERROR,
"Could not write cached audio packet ret:%d\n", ret);
return ret;
}
}
if (mkv->cluster_pos != -1) {
ret = end_ebml_master_crc32(pb, &mkv->cluster_bc, mkv,
MATROSKA_ID_CLUSTER, 0, 0, 0);
if (ret < 0)
return ret;
}
ret = mkv_write_chapters(s);
if (ret < 0)
return ret;
if (!IS_SEEKABLE(pb, mkv))
return 0;
endpos = avio_tell(pb);
if (mkv->cues.num_entries && mkv->reserve_cues_space >= 0) {
AVIOContext *cues = NULL;
uint64_t size;
int length_size = 0;
ret = start_ebml_master_crc32(&cues, mkv);
if (ret < 0)
return ret;
ret = mkv_assemble_cues(s->streams, cues, &mkv->cues,
mkv->tracks, s->nb_streams);
if (ret < 0) {
ffio_free_dyn_buf(&cues);
return ret;
}
if (mkv->reserve_cues_space) {
size = avio_tell(cues);
length_size = ebml_length_size(size);
size += 4 + length_size;
if (mkv->reserve_cues_space < size) {
av_log(s, AV_LOG_WARNING,
"Insufficient space reserved for Cues: "
"%d < %"PRIu64". No Cues will be output.\n",
mkv->reserve_cues_space, size);
ret2 = AVERROR(EINVAL);
goto after_cues;
} else {
if ((ret64 = avio_seek(pb, mkv->cues_pos, SEEK_SET)) < 0) {
ffio_free_dyn_buf(&cues);
return ret64;
}
if (mkv->reserve_cues_space == size + 1) {
/* There is no way to reserve a single byte because
* the minimal size of an EBML Void element is 2
* (1 byte ID, 1 byte length field). This problem
* is solved by writing the Cues' length field on
* one byte more than necessary. */
length_size++;
size++;
}
}
}
ret = end_ebml_master_crc32(pb, &cues, mkv, MATROSKA_ID_CUES,
length_size, 0, 1);
if (ret < 0)
return ret;
if (mkv->reserve_cues_space) {
if (size < mkv->reserve_cues_space)
put_ebml_void(pb, mkv->reserve_cues_space - size);
} else
endpos = avio_tell(pb);
}
after_cues:
/* Lengths greater than (1ULL << 56) - 1 can't be represented
* via an EBML number, so leave the unknown length field. */
if (endpos - mkv->segment_offset < (1ULL << 56) - 1) {
if ((ret64 = avio_seek(pb, mkv->segment_offset - 8, SEEK_SET)) < 0)
return ret64;
put_ebml_length(pb, endpos - mkv->segment_offset, 8);
}
ret = mkv_write_seekhead(pb, mkv, 1, mkv->info.pos);
if (ret < 0)
return ret;
if (mkv->info.bc) {
// update the duration
av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
avio_seek(mkv->info.bc, mkv->duration_offset, SEEK_SET);
put_ebml_float(mkv->info.bc, MATROSKA_ID_DURATION, mkv->duration);
ret = end_ebml_master_crc32(pb, &mkv->info.bc, mkv,
MATROSKA_ID_INFO, 0, 0, 0);
if (ret < 0)
return ret;
}
if (mkv->track.bc) {
// write Tracks master
avio_seek(pb, mkv->track.pos, SEEK_SET);
ret = end_ebml_master_crc32(pb, &mkv->track.bc, mkv,
MATROSKA_ID_TRACKS, 0, 0, 0);
if (ret < 0)
return ret;
}
// update stream durations
if (mkv->tags.bc) {
int i;
for (i = 0; i < s->nb_streams; ++i) {
const AVStream *st = s->streams[i];
const mkv_track *track = &mkv->tracks[i];
if (track->duration_offset > 0) {
double duration_sec = track->duration * av_q2d(st->time_base);
char duration_string[20] = "";
av_log(s, AV_LOG_DEBUG, "stream %d end duration = %" PRIu64 "\n", i,
track->duration);
avio_seek(mkv->tags.bc, track->duration_offset, SEEK_SET);
snprintf(duration_string, 20, "%02d:%02d:%012.9f",
(int) duration_sec / 3600, ((int) duration_sec / 60) % 60,
fmod(duration_sec, 60));
put_ebml_binary(mkv->tags.bc, MATROSKA_ID_TAGSTRING, duration_string, 20);
}
}
avio_seek(pb, mkv->tags.pos, SEEK_SET);
ret = end_ebml_master_crc32(pb, &mkv->tags.bc, mkv,
MATROSKA_ID_TAGS, 0, 0, 0);
if (ret < 0)
return ret;
}
avio_seek(pb, endpos, SEEK_SET);
return ret2;
}
static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
{
int i;
for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
if (ff_mkv_codec_tags[i].id == codec_id)
return 1;
if (std_compliance < FF_COMPLIANCE_NORMAL) {
enum AVMediaType type = avcodec_get_type(codec_id);
// mkv theoretically supports any video/audio through VFW/ACM
if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
return 1;
}
return 0;
}
static int webm_query_codec(enum AVCodecID codec_id, int std_compliance)
{
int i;
for (i = 0; ff_webm_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
if (ff_webm_codec_tags[i].id == codec_id)
return 1;
return 0;
}
static uint64_t mkv_get_uid(const mkv_track *tracks, int i, AVLFG *c)
{
while (1) {
uint64_t uid;
int k;
uid = (uint64_t)av_lfg_get(c) << 32;
uid |= av_lfg_get(c);
if (!uid)
continue;
for (k = 0; k < i; k++) {
if (tracks[k].uid == uid)
break;
}
if (k == i)
return uid;
}
}
static int mkv_init(struct AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
AVLFG c;
unsigned nb_tracks = 0;
int i;
for (i = 0; i < s->nb_streams; i++) {
if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_ATRAC3 ||
s->streams[i]->codecpar->codec_id == AV_CODEC_ID_COOK ||
s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
s->streams[i]->codecpar->codec_id == AV_CODEC_ID_SIPR ||
s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV10 ||
s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV20) {
av_log(s, AV_LOG_ERROR,
"The Matroska muxer does not yet support muxing %s\n",
avcodec_get_name(s->streams[i]->codecpar->codec_id));
return AVERROR_PATCHWELCOME;
}
}
if (s->avoid_negative_ts < 0) {
s->avoid_negative_ts = 1;
s->internal->avoid_negative_ts_use_pts = 1;
}
if (!strcmp(s->oformat->name, "webm")) {
mkv->mode = MODE_WEBM;
mkv->write_crc = 0;
} else
mkv->mode = MODE_MATROSKAv2;
mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
if (!mkv->tracks)
return AVERROR(ENOMEM);
if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
av_lfg_init(&c, av_get_random_seed());
// Calculate the SegmentUID now in order not to waste our random seed.
for (i = 0; i < 4; i++)
mkv->segment_uid[i] = av_lfg_get(&c);
}
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
mkv_track *track = &mkv->tracks[i];
if (s->flags & AVFMT_FLAG_BITEXACT) {
track->uid = i + 1;
} else {
track->uid = mkv_get_uid(mkv->tracks, i, &c);
}
// ms precision is the de-facto standard timescale for mkv files
avpriv_set_pts_info(st, 64, 1, 1000);
if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
if (mkv->mode == MODE_WEBM) {
av_log(s, AV_LOG_WARNING, "Stream %d will be ignored "
"as WebM doesn't support attachments.\n", i);
} else if (!get_mimetype(st)) {
av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype "
"tag and it cannot be deduced from the codec id.\n", i);
return AVERROR(EINVAL);
}
mkv->nb_attachments++;
continue;
}
nb_tracks++;
track->track_num = mkv->is_dash ? mkv->dash_track_number : nb_tracks;
track->track_num_size = ebml_num_size(track->track_num);
}
if (mkv->is_dash && nb_tracks != 1)
return AVERROR(EINVAL);
return 0;
}
static int mkv_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
{
int ret = 1;
AVStream *st = s->streams[pkt->stream_index];
if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0)
ret = ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL);
} else if (st->codecpar->codec_id == AV_CODEC_ID_VP9) {
ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);
}
return ret;
}
static const AVCodecTag additional_audio_tags[] = {
{ AV_CODEC_ID_ALAC, 0XFFFFFFFF },
{ AV_CODEC_ID_MLP, 0xFFFFFFFF },
{ AV_CODEC_ID_OPUS, 0xFFFFFFFF },
{ AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
{ AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
{ AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
{ AV_CODEC_ID_QDMC, 0xFFFFFFFF },
{ AV_CODEC_ID_QDM2, 0xFFFFFFFF },
{ AV_CODEC_ID_RA_144, 0xFFFFFFFF },
{ AV_CODEC_ID_RA_288, 0xFFFFFFFF },
{ AV_CODEC_ID_COOK, 0xFFFFFFFF },
{ AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
{ AV_CODEC_ID_NONE, 0xFFFFFFFF }
};
static const AVCodecTag additional_video_tags[] = {
{ AV_CODEC_ID_RV10, 0xFFFFFFFF },
{ AV_CODEC_ID_RV20, 0xFFFFFFFF },
{ AV_CODEC_ID_RV30, 0xFFFFFFFF },
{ AV_CODEC_ID_NONE, 0xFFFFFFFF }
};
static const AVCodecTag additional_subtitle_tags[] = {
{ AV_CODEC_ID_DVB_SUBTITLE, 0xFFFFFFFF },
{ AV_CODEC_ID_DVD_SUBTITLE, 0xFFFFFFFF },
{ AV_CODEC_ID_HDMV_PGS_SUBTITLE, 0xFFFFFFFF },
{ AV_CODEC_ID_NONE, 0xFFFFFFFF }
};
#define OFFSET(x) offsetof(MatroskaMuxContext, x)
#define FLAGS AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "reserve_index_space", "Reserve a given amount of space (in bytes) at the beginning of the file for the index (cues).", OFFSET(reserve_cues_space), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "cluster_size_limit", "Store at most the provided amount of bytes in a cluster. ", OFFSET(cluster_size_limit), AV_OPT_TYPE_INT , { .i64 = -1 }, -1, INT_MAX, FLAGS },
{ "cluster_time_limit", "Store at most the provided number of milliseconds in a cluster.", OFFSET(cluster_time_limit), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
{ "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, INT_MAX, FLAGS },
{ "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "flipped_raw_rgb", "Raw RGB bitmaps in VFW mode are stored bottom-up", OFFSET(flipped_raw_rgb), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "write_crc32", "write a CRC32 element inside every Level 1 element", OFFSET(write_crc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
{ "default_mode", "Controls how a track's FlagDefault is inferred", OFFSET(default_mode), AV_OPT_TYPE_INT, { .i64 = DEFAULT_MODE_INFER }, DEFAULT_MODE_INFER, DEFAULT_MODE_PASSTHROUGH, FLAGS, "default_mode" },
{ "infer", "For each track type, mark the first track of disposition default as default; if none exists, mark the first track as default.", 0, AV_OPT_TYPE_CONST, { .i64 = DEFAULT_MODE_INFER }, 0, 0, FLAGS, "default_mode" },
{ "infer_no_subs", "For each track type, mark the first track of disposition default as default; for audio and video: if none exists, mark the first track as default.", 0, AV_OPT_TYPE_CONST, { .i64 = DEFAULT_MODE_INFER_NO_SUBS }, 0, 0, FLAGS, "default_mode" },
{ "passthrough", "Use the disposition flag as-is", 0, AV_OPT_TYPE_CONST, { .i64 = DEFAULT_MODE_PASSTHROUGH }, 0, 0, FLAGS, "default_mode" },
{ NULL },
};
#if CONFIG_MATROSKA_MUXER
static const AVClass matroska_class = {
.class_name = "matroska muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVOutputFormat ff_matroska_muxer = {
.name = "matroska",
.long_name = NULL_IF_CONFIG_SMALL("Matroska"),
.mime_type = "video/x-matroska",
.extensions = "mkv",
.priv_data_size = sizeof(MatroskaMuxContext),
.audio_codec = CONFIG_LIBVORBIS_ENCODER ?
AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
.video_codec = CONFIG_LIBX264_ENCODER ?
AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
.init = mkv_init,
.deinit = mkv_deinit,
.write_header = mkv_write_header,
.write_packet = mkv_write_flush_packet,
.write_trailer = mkv_write_trailer,
.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
.codec_tag = (const AVCodecTag* const []){
ff_codec_bmp_tags, ff_codec_wav_tags,
additional_audio_tags, additional_video_tags, additional_subtitle_tags, 0
},
.subtitle_codec = AV_CODEC_ID_ASS,
.query_codec = mkv_query_codec,
.check_bitstream = mkv_check_bitstream,
.priv_class = &matroska_class,
};
#endif
#if CONFIG_WEBM_MUXER
static const AVClass webm_class = {
.class_name = "webm muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVOutputFormat ff_webm_muxer = {
.name = "webm",
.long_name = NULL_IF_CONFIG_SMALL("WebM"),
.mime_type = "video/webm",
.extensions = "webm",
.priv_data_size = sizeof(MatroskaMuxContext),
.audio_codec = CONFIG_LIBOPUS_ENCODER ? AV_CODEC_ID_OPUS : AV_CODEC_ID_VORBIS,
.video_codec = CONFIG_LIBVPX_VP9_ENCODER? AV_CODEC_ID_VP9 : AV_CODEC_ID_VP8,
.subtitle_codec = AV_CODEC_ID_WEBVTT,
.init = mkv_init,
.deinit = mkv_deinit,
.write_header = mkv_write_header,
.write_packet = mkv_write_flush_packet,
.write_trailer = mkv_write_trailer,
.query_codec = webm_query_codec,
.check_bitstream = mkv_check_bitstream,
.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
.priv_class = &webm_class,
};
#endif
#if CONFIG_MATROSKA_AUDIO_MUXER
static const AVClass mka_class = {
.class_name = "matroska audio muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVOutputFormat ff_matroska_audio_muxer = {
.name = "matroska",
.long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
.mime_type = "audio/x-matroska",
.extensions = "mka",
.priv_data_size = sizeof(MatroskaMuxContext),
.audio_codec = CONFIG_LIBVORBIS_ENCODER ?
AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
.video_codec = AV_CODEC_ID_NONE,
.init = mkv_init,
.deinit = mkv_deinit,
.write_header = mkv_write_header,
.write_packet = mkv_write_flush_packet,
.write_trailer = mkv_write_trailer,
.check_bitstream = mkv_check_bitstream,
.flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
AVFMT_ALLOW_FLUSH,
.codec_tag = (const AVCodecTag* const []){
ff_codec_wav_tags, additional_audio_tags, 0
},
.priv_class = &mka_class,
};
#endif
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