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matroska: split real video frames so that each packet contains only one slice

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Originally committed as revision 7129 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2006-11-20 00:31:59 +00:00
parent 363c86ce66
commit a487d231cb
1 changed files with 32 additions and 7 deletions
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39
libavformat/matroska.c
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@ -176,6 +176,7 @@ typedef enum {
MATROSKA_TRACK_ENABLED = (1<<0),
MATROSKA_TRACK_DEFAULT = (1<<1),
MATROSKA_TRACK_LACING = (1<<2),
MATROSKA_TRACK_REAL_V = (1<<4),
MATROSKA_TRACK_SHIFT = (1<<16)
} MatroskaTrackFlags;
@ -2267,6 +2268,7 @@ matroska_read_header (AVFormatContext *s,
codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
extradata_offset = 26;
track->codec_priv_size -= extradata_offset;
track->flags |= MATROSKA_TRACK_REAL_V;
}
if (codec_id == CODEC_ID_NONE) {
@ -2348,6 +2350,12 @@ matroska_find_track_by_num (MatroskaDemuxContext *matroska,
return -1;
}
static inline int
rv_offset(uint8_t *data, int slice, int slices)
{
return LE_32(data+8*slice+4) + 8*slices;
}
static int
matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
uint64_t cluster_time)
@ -2498,14 +2506,14 @@ matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
}
if (res == 0) {
int real_v = matroska->tracks[track]->flags & MATROSKA_TRACK_REAL_V;
for (n = 0; n < laces; n++) {
uint64_t timecode = AV_NOPTS_VALUE;
int slice, slices = 1;
pkt = av_mallocz(sizeof(AVPacket));
/* XXX: prevent data copy... */
if (av_new_packet(pkt,lace_size[n]) < 0) {
res = AVERROR_NOMEM;
break;
if (real_v) {
slices = *data++ + 1;
lace_size[n]--;
}
if (cluster_time != (uint64_t)-1 && n == 0) {
if (cluster_time + block_time >= 0)
@ -2513,8 +2521,23 @@ matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
}
/* FIXME: duration */
memcpy(pkt->data, data, lace_size[n]);
data += lace_size[n];
for (slice=0; slice<slices; slice++) {
int slice_size, slice_offset = 0;
if (real_v)
slice_offset = rv_offset(data, slice, slices);
if (slice+1 == slices)
slice_size = lace_size[n] - slice_offset;
else
slice_size = rv_offset(data, slice+1, slices) - slice_offset;
pkt = av_mallocz(sizeof(AVPacket));
/* XXX: prevent data copy... */
if (av_new_packet(pkt, slice_size) < 0) {
res = AVERROR_NOMEM;
n = laces-1;
break;
}
memcpy (pkt->data, data+slice_offset, slice_size);
if (n == 0)
pkt->flags = is_keyframe;
pkt->stream_index =
@ -2524,6 +2547,8 @@ matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
pkt->pos= pos;
matroska_queue_packet(matroska, pkt);
}
data += lace_size[n];
}
}