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Code Issues Releases Activity

Write the cues element

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Originally committed as revision 10320 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad 2007-09-05 00:23:27 +00:00
parent 1b66d31467
commit 6364d534ea
1 changed files with 91 additions and 1 deletions
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92
libavformat/matroskaenc.c
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@ -38,15 +38,29 @@ typedef struct mkv_seekhead {
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;
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;
} MatroskaMuxContext;
static void put_ebml_id(ByteIOContext *pb, unsigned int id)
@ -241,6 +255,68 @@ static offset_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *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;
currentpos = url_ftell(pb);
cues_element = start_ebml_master(pb, MATROSKA_ID_CUES);
for (i = 0; i < cues->num_entries; i++) {
offset_t cuepoint, track_positions;
mkv_cuepoint *entry = &cues->entries[i];
uint64_t pts = entry->pts;
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);
}
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;
@ -417,10 +493,15 @@ static int mkv_write_header(AVFormatContext *s)
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;
}
@ -436,6 +517,7 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
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;
@ -448,6 +530,11 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
put_byte(pb, !!(pkt->flags & PKT_FLAG_KEY));
put_buffer(pb, pkt->data, pkt->size);
if (s->streams[pkt->stream_index]->codec->codec_type == CODEC_TYPE_VIDEO && pkt->flags & PKT_FLAG_KEY) {
if (mkv_add_cuepoint(mkv->cues, pkt, mkv->cluster_pos) < 0)
return -1;
}
mkv->duration = pkt->pts + pkt->duration;
return 0;
}
@ -456,11 +543,14 @@ static int mkv_write_trailer(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
ByteIOContext *pb = &s->pb;
offset_t currentpos, second_seekhead;
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);