*/
#include "avformat.h"
+#include "random.h"
#include "riff.h"
+#include "xiph.h"
#include "matroska.h"
+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 {
- offset_t segment;
+ offset_t segment;
+ offset_t segment_offset;
+ offset_t 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;
+
+ AVRandomState rand_state;
} MatroskaMuxContext;
static void put_ebml_id(ByteIOContext *pb, unsigned int id)
put_byte(pb, id);
}
+static int ebml_id_size(unsigned int id)
+{
+ return (av_log2(id+1)-1)/7+1;
+}
+
// XXX: test this thoroughly and get rid of minbytes hack (currently needed to
// use up all of the space reserved in start_ebml_master)
static void put_ebml_size(ByteIOContext *pb, uint64_t size, int minbytes)
{
int bytes = minbytes;
- while (size >> (bytes*7 + 7)) bytes++;
// sizes larger than this are currently undefined in EBML
- // XXX: error condition?
- if (size > (1ULL<<56)-1) return;
+ // so write "unknown" size
+ size = FFMIN(size, (1ULL<<56)-1);
+
+ while (size >> (bytes*7 + 7)) bytes++;
put_byte(pb, (0x80 >> bytes) | (size >> bytes*8));
for (bytes -= 1; bytes >= 0; bytes--)
put_byte(pb, val >> bytes*8);
}
-//static void put_ebml_sint(ByteIOContext *pb, unsigned int elementid, int64_t val)
-
static void put_ebml_float(ByteIOContext *pb, unsigned int elementid, double val)
{
- // XXX: single-precision floats?
put_ebml_id(pb, elementid);
put_ebml_size(pb, 8, 0);
put_be64(pb, av_dbl2int(val));
put_ebml_binary(pb, elementid, str, strlen(str));
}
+// this reserves exactly the amount of space specified by size, which must be at least 2
+static void put_ebml_void(ByteIOContext *pb, uint64_t size)
+{
+ offset_t currentpos = url_ftell(pb);
+
+ if (size < 2)
+ return;
+
+ 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_size(pb, size-1, 0);
+ else
+ put_ebml_size(pb, size-9, 7);
+ url_fseek(pb, currentpos + size, SEEK_SET);
+}
+
static offset_t start_ebml_master(ByteIOContext *pb, unsigned int elementid)
{
put_ebml_id(pb, elementid);
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);
+}
-static int mkv_write_header(AVFormatContext *s)
+// initializes a mkv_seekhead element to be ready to index level 1 matroska elements
+// if numelements is greater than 0, it reserves enough space for that many elements
+// at the current file position and writes the seekhead there, otherwise the seekhead
+// will be appended to the file when end_mkv_seekhead() is called
+static mkv_seekhead * mkv_start_seekhead(ByteIOContext *pb, offset_t segment_offset, int numelements)
{
- MatroskaMuxContext *mkv = s->priv_data;
- ByteIOContext *pb = &s->pb;
- offset_t ebml_header, segment_info, tracks;
+ 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
+ // XXX: 28 bytes right now because begin_ebml_master() reserves more than necessary
+ new_seekhead->reserved_size = numelements * 28 + 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;
+ int new_entry = seekhead->num_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 -1;
+
+ entries[new_entry].elementid = elementid;
+ entries[new_entry].segmentpos = filepos - seekhead->segment_offset;
+
+ seekhead->entries = entries;
+ seekhead->num_entries++;
+
+ return 0;
+}
+
+// returns the file offset where the seekhead was written and frees the seekhead
+static offset_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *seekhead)
+{
+ offset_t metaseek, seekentry, 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);
+ for (i = 0; i < seekhead->num_entries; i++) {
+ mkv_seekhead_entry *entry = &seekhead->entries[i];
+
+ seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY);
+
+ put_ebml_id(pb, MATROSKA_ID_SEEKID);
+ put_ebml_size(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;
+ int new_entry = cues->num_entries;
+
+ entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
+ if (entries == NULL)
+ return -1;
+
+ entries[new_entry].pts = pkt->pts;
+ entries[new_entry].tracknum = pkt->stream_index + 1;
+ entries[new_entry].cluster_pos = cluster_pos - cues->segment_offset;
+
+ cues->entries = entries;
+ cues->num_entries++;
+ return 0;
+}
+
+static offset_t mkv_write_cues(ByteIOContext *pb, mkv_cues *cues)
+{
+ offset_t currentpos, cues_element;
int i, j;
- ebml_header = start_ebml_master(pb, EBML_ID_HEADER);
- 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 , 1);
- put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 1);
- end_ebml_master(pb, ebml_header);
+ currentpos = url_ftell(pb);
+ cues_element = start_ebml_master(pb, MATROSKA_ID_CUES);
- mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT);
+ for (i = 0; i < cues->num_entries; i++) {
+ offset_t cuepoint, track_positions;
+ mkv_cuepoint *entry = &cues->entries[i];
+ uint64_t pts = entry->pts;
- segment_info = start_ebml_master(pb, MATROSKA_ID_INFO);
- put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
- if (strlen(s->title))
- put_ebml_string(pb, MATROSKA_ID_TITLE, s->title);
- if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
- put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
- // XXX: both are required; something better for writing app?
- put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
+ cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY);
+ 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);
+ 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);
}
- // XXX: segment UID and duration
- end_ebml_master(pb, segment_info);
+ end_ebml_master(pb, cues_element);
+
+ av_free(cues->entries);
+ av_free(cues);
+ return currentpos;
+}
+
+static int put_xiph_codecpriv(ByteIOContext *pb, AVCodecContext *codec)
+{
+ offset_t codecprivate;
+ 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(codec, AV_LOG_ERROR, "Extradata corrupt.\n");
+ return -1;
+ }
+
+ codecprivate = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE);
+ 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]);
+ end_ebml_master(pb, codecprivate);
+
+ return 0;
+}
+
+#define FLAC_STREAMINFO_SIZE 34
+
+static int put_flac_codecpriv(ByteIOContext *pb, AVCodecContext *codec)
+{
+ offset_t codecpriv = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE);
+
+ // 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(codec, 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(codec, AV_LOG_ERROR, "Only one packet\n");
+ }
+ put_buffer(pb, codec->extradata, codec->extradata_size);
+ end_ebml_master(pb, codecpriv);
+ return 0;
+}
+
+static void get_aac_sample_rates(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(codec, AV_LOG_WARNING, "no aac extradata, unable to determine sample rate\n");
+ return;
+ }
+
+ sri = ((codec->extradata[0] << 1) & 0xE) | (codec->extradata[1] >> 7);
+ if (sri > 12) {
+ av_log(codec, 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(codec, AV_LOG_WARNING, "aac output samplerate index out of bounds\n");
+ return;
+ }
+ *output_sample_rate = aac_sample_rates[sri];
+ }
+}
+
+static int mkv_write_tracks(AVFormatContext *s)
+{
+ MatroskaMuxContext *mkv = s->priv_data;
+ ByteIOContext *pb = &s->pb;
+ offset_t tracks;
+ int i, j;
+
+ if (mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, url_ftell(pb)) < 0)
+ return -1;
tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS);
for (i = 0; i < s->nb_streams; i++) {
AVCodecContext *codec = st->codec;
offset_t 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 (codec->codec_id == CODEC_ID_AAC)
+ get_aac_sample_rates(codec, &sample_rate, &output_sample_rate);
track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY);
- put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i);
- // XXX: random number for UID? and can we use the same UID when copying
- // from another MKV as the specs recommend?
- put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i);
+ 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])
}
}
- // XXX: CodecPrivate for vorbis, theora, aac, native mpeg4, ...
if (native_id) {
- put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codec->extradata, codec->extradata_size);
+ if (codec->codec_id == CODEC_ID_VORBIS || codec->codec_id == CODEC_ID_THEORA) {
+ if (put_xiph_codecpriv(pb, codec) < 0)
+ return -1;
+ } else if (codec->codec_id == CODEC_ID_FLAC) {
+ if (put_flac_codecpriv(pb, codec) < 0)
+ return -1;
+ } else if (codec->extradata_size) {
+ put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codec->extradata, codec->extradata_size);
+ }
}
switch (codec->codec_type) {
codec->codec_tag = codec_get_tag(codec_bmp_tags, codec->codec_id);
put_ebml_string(pb, MATROSKA_ID_CODECID, MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC);
- // XXX: codec private isn't a master; is there a better way to re-use put_bmp_header?
bmp_header = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE);
put_bmp_header(pb, codec, codec_bmp_tags, 0);
end_ebml_master(pb, bmp_header);
// XXX: interlace flag?
put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
- // XXX: display width/height
+ if (codec->sample_aspect_ratio.num) {
+ put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , codec->sample_aspect_ratio.num);
+ put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->sample_aspect_ratio.den);
+ }
end_ebml_master(pb, subinfo);
break;
case CODEC_TYPE_AUDIO:
put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
- // XXX: A_MS/ACM
+ if (!native_id) {
+ offset_t wav_header;
+ // no mkv-specific ID, use ACM mode
+ codec->codec_tag = codec_get_tag(codec_wav_tags, codec->codec_id);
+ if (!codec->codec_tag) {
+ av_log(s, AV_LOG_ERROR, "no codec id found for stream %d", i);
+ return -1;
+ }
+
+ put_ebml_string(pb, MATROSKA_ID_CODECID, MATROSKA_CODEC_ID_AUDIO_ACM);
+ wav_header = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE);
+ put_wav_header(pb, codec);
+ end_ebml_master(pb, wav_header);
+ }
subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO);
put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
- put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, codec->sample_rate);
- // XXX: output sample freq (for sbr) and bitdepth (for pcm)
+ 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 and video are supported for Matroska.");
break;
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;
+ offset_t ebml_header, segment_info;
+ int i;
+
+ av_init_random(av_gettime(), &mkv->rand_state);
+
+ ebml_header = start_ebml_master(pb, EBML_ID_HEADER);
+ 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);
+ mkv->segment_offset = url_ftell(pb);
+
+ // we write 2 seek heads - one at the end of the file to point to each cluster, and
+ // one at the beginning to point to all other level one elements (including the seek
+ // head at the end of the file), which isn't more than 10 elements if we only write one
+ // of each other currently defined level 1 element
+ mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
+ mkv->cluster_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 0);
+
+ if (mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, url_ftell(pb)) < 0)
+ return -1;
+
+ segment_info = start_ebml_master(pb, MATROSKA_ID_INFO);
+ put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
+ if (strlen(s->title))
+ put_ebml_string(pb, MATROSKA_ID_TITLE, s->title);
+ if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
+ uint8_t segmentuid[16];
+ for (i = 0; i < 16; i++)
+ segmentuid[i] = av_random(&mkv->rand_state);
+
+ put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
+ put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
+ put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segmentuid, 16);
+ }
+
+ // reserve space for the duration
+ mkv->duration = 0;
+ mkv->duration_offset = url_ftell(pb);
+ put_ebml_void(pb, 11); // assumes double-precision float to be written
+ end_ebml_master(pb, segment_info);
+
+ if (mkv_write_tracks(s) < 0)
+ return -1;
+
+ if (mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb)) < 0)
+ return -1;
+
+ mkv->cluster_pos = url_ftell(pb);
+ mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER);
+ put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, 0);
+ mkv->cluster_pts = 0;
+
+ mkv->cues = mkv_start_cues(mkv->segment_offset);
+ if (mkv->cues == NULL)
+ return -1;
return 0;
}
-static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
+static void mkv_write_block(AVFormatContext *s, unsigned int blockid, AVPacket *pkt, int flags)
{
+ MatroskaMuxContext *mkv = s->priv_data;
ByteIOContext *pb = &s->pb;
+
+ put_ebml_id(pb, blockid);
+ put_ebml_size(pb, pkt->size + 4, 0);
+ put_byte(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
+ put_be16(pb, pkt->pts - mkv->cluster_pts);
+ put_byte(pb, 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);
+
+ // start a new cluster every 5 MB or 5 sec
+ if (url_ftell(pb) > mkv->cluster + 5*1024*1024 || pkt->pts > mkv->cluster_pts + 5000) {
+ end_ebml_master(pb, mkv->cluster);
+
+ if (mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb)) < 0)
+ return -1;
+
+ mkv->cluster_pos = url_ftell(pb);
+ mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER);
+ put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, pkt->pts);
+ mkv->cluster_pts = pkt->pts;
+ }
+
+ if (codec->codec_type != CODEC_TYPE_SUBTITLE) {
+ mkv_write_block(s, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
+ } else {
+ offset_t blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP);
+ 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) {
+ if (mkv_add_cuepoint(mkv->cues, pkt, mkv->cluster_pos) < 0)
+ return -1;
+ }
+
+ mkv->duration = pkt->pts + pkt->duration;
return 0;
}
{
MatroskaMuxContext *mkv = s->priv_data;
ByteIOContext *pb = &s->pb;
+ offset_t currentpos, second_seekhead, cuespos;
+
+ end_ebml_master(pb, mkv->cluster);
+
+ cuespos = mkv_write_cues(pb, mkv->cues);
+ second_seekhead = mkv_write_seekhead(pb, mkv->cluster_seekhead);
+
+ mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES , cuespos);
+ mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_SEEKHEAD, second_seekhead);
+ mkv_write_seekhead(pb, mkv->main_seekhead);
+
+ // update the duration
+ currentpos = url_ftell(pb);
+ url_fseek(pb, mkv->duration_offset, SEEK_SET);
+ put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
+ url_fseek(pb, currentpos, SEEK_SET);
+
end_ebml_master(pb, mkv->segment);
return 0;
}
projects / ffmpeg / blobdiff