RepoMirrors/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2024-12-26 17:32:06 +00:00
Code Issues Projects Releases Wiki Activity

mxfdec: Set DTS and PTS on video packets

Browse Source 
This involves computing DTS/PTS from the index tables.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Tomas Härdin 2011-12-09 17:56:46 +01:00 committed by Michael Niedermayer
parent 8a2cb2abbf
commit 7d531e83b6
2 changed files with 117 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

96
libavformat/mxfdec.c
View File

@ -201,6 +201,9 @@ typedef struct {
int current_stream;
int d10;
int broken_index;
int64_t first_dts; /* DTS = EditUnit + first_dts */
int64_t *ptses; /* maps EditUnit -> PTS */
int nb_ptses;
} MXFContext;
enum MXFWrappingScheme {
@ -478,6 +481,11 @@ static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
pkt->pos = e->pos;
}
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && mxf->ptses && mxf->current_edit_unit < mxf->nb_ptses) {
pkt->dts = mxf->current_edit_unit + mxf->first_dts;
pkt->pts = mxf->ptses[mxf->current_edit_unit];
}
pkt->stream_index = mxf->current_stream++;
return 0;
@ -1229,6 +1237,91 @@ static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st, MXFIndex
return 0;
}
static int mxf_compute_ptses(MXFContext *mxf, MXFIndexTableSegment **sorted_segments, int nb_sorted_segments)
{
int ret, i, j, x;
int8_t max_temporal_offset = -128;
/* first compute how many entries we have */
for (i = 0; i < nb_sorted_segments; i++) {
MXFIndexTableSegment *s = sorted_segments[i];
if (!s->nb_index_entries)
return 0; /* no TemporalOffsets */
if (s->nb_index_entries == 2 * s->index_duration + 1)
mxf->nb_ptses += s->index_duration; /* Avid index */
else
mxf->nb_ptses += s->nb_index_entries;
}
/* paranoid check */
if (mxf->nb_ptses <= 0)
return 0;
if (!(mxf->ptses = av_calloc(mxf->nb_ptses, sizeof(int64_t))))
return AVERROR(ENOMEM);
/* we may have a few bad TemporalOffsets
* make sure the corresponding PTSes don't have the bogus value 0 */
for (x = 0; x < mxf->nb_ptses; x++)
mxf->ptses[x] = AV_NOPTS_VALUE;
/**
* We have this:
*
* x TemporalOffset
* 0: 0
* 1: 1
* 2: 1
* 3: -2
* 4: 1
* 5: 1
* 6: -2
*
* We want to transform it into this:
*
* x DTS PTS
* 0: -1 0
* 1: 0 3
* 2: 1 1
* 3: 2 2
* 4: 3 6
* 5: 4 4
* 6: 5 5
*
* We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,
* then settings mxf->first_dts = -max(TemporalOffset[x]).
* The latter makes DTS <= PTS.
*/
for (i = x = 0; i < nb_sorted_segments; i++) {
MXFIndexTableSegment *s = sorted_segments[i];
int index_delta = 1;
if (s->nb_index_entries == 2 * s->index_duration + 1)
index_delta = 2; /* Avid index */
for (j = 0; j < s->nb_index_entries; j += index_delta, x++) {
int offset = s->temporal_offset_entries[j] / index_delta;
int index = x + offset;
if (index < 0 || index >= mxf->nb_ptses) {
av_log(mxf->fc, AV_LOG_ERROR,
"index entry %i + TemporalOffset %i = %i, which is out of bounds\n",
x, offset, index);
continue;
}
mxf->ptses[index] = x;
max_temporal_offset = FFMAX(max_temporal_offset, offset);
}
}
mxf->first_dts = -max_temporal_offset;
return 0;
}
static int mxf_parse_structural_metadata(MXFContext *mxf)
{
MXFPackage *material_package = NULL;
@ -1435,7 +1528,7 @@ static int mxf_parse_structural_metadata(MXFContext *mxf)
goto fail_and_free;
}
ret = 0;
ret = mxf_compute_ptses(mxf, sorted_segments, nb_sorted_segments);
fail_and_free:
av_free(sorted_segments);
@ -1777,6 +1870,7 @@ static int mxf_read_close(AVFormatContext *s)
av_freep(&mxf->metadata_sets);
av_freep(&mxf->aesc);
av_freep(&mxf->local_tags);
av_freep(&mxf->ptses);
return 0;
}

44
tests/ref/seek/lavf_mxf
View File

@ -1,48 +1,48 @@
ret: 0 st: 0 flags:1 dts: 0.000000 pts: NOPTS pos: 6144 size: 24801
ret: 0 st: 0 flags:1 dts:-0.040000 pts: 0.000000 pos: 6144 size: 24801
ret: 0 st:-1 flags:0 ts:-1.000000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: NOPTS pos: 6144 size: 24801
ret: 0 st: 0 flags:1 dts:-0.040000 pts: 0.000000 pos: 6144 size: 24801
ret: 0 st:-1 flags:1 ts: 1.894167
ret: 0 st: 0 flags:1 dts: 0.880000 pts: NOPTS pos: 460800 size: 24712
ret: 0 st: 0 flags:1 dts: 0.840000 pts: 0.960000 pos: 460800 size: 24712
ret: 0 st: 0 flags:0 ts: 0.800000
ret: 0 st: 0 flags:1 dts: 0.880000 pts: NOPTS pos: 460800 size: 24712
ret: 0 st: 0 flags:1 dts: 0.840000 pts: 0.960000 pos: 460800 size: 24712
ret: 0 st: 0 flags:1 ts:-0.320000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: NOPTS pos: 6144 size: 24801
ret: 0 st: 0 flags:1 dts:-0.040000 pts: 0.000000 pos: 6144 size: 24801
ret:-1 st: 1 flags:0 ts: 2.560000
ret: 0 st: 1 flags:1 ts: 1.480000
ret: 0 st: 0 flags:1 dts: 0.880000 pts: NOPTS pos: 460800 size: 24712
ret: 0 st: 0 flags:1 dts: 0.840000 pts: 0.960000 pos: 460800 size: 24712
ret: 0 st:-1 flags:0 ts: 0.365002
ret: 0 st: 0 flags:1 dts: 0.400000 pts: NOPTS pos: 211968 size: 24787
ret: 0 st: 0 flags:1 dts: 0.360000 pts: 0.480000 pos: 211968 size: 24787
ret: 0 st:-1 flags:1 ts:-0.740831
ret: 0 st: 0 flags:1 dts: 0.000000 pts: NOPTS pos: 6144 size: 24801
ret: 0 st: 0 flags:1 dts:-0.040000 pts: 0.000000 pos: 6144 size: 24801
ret:-1 st: 0 flags:0 ts: 2.160000
ret: 0 st: 0 flags:1 ts: 1.040000
ret: 0 st: 0 flags:1 dts: 0.880000 pts: NOPTS pos: 460800 size: 24712
ret: 0 st: 0 flags:1 dts: 0.840000 pts: 0.960000 pos: 460800 size: 24712
ret: 0 st: 1 flags:0 ts:-0.040000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: NOPTS pos: 6144 size: 24801
ret: 0 st: 0 flags:1 dts:-0.040000 pts: 0.000000 pos: 6144 size: 24801
ret: 0 st: 1 flags:1 ts: 2.840000
ret: 0 st: 0 flags:1 dts: 0.880000 pts: NOPTS pos: 460800 size: 24712
ret: 0 st: 0 flags:1 dts: 0.840000 pts: 0.960000 pos: 460800 size: 24712
ret:-1 st:-1 flags:0 ts: 1.730004
ret: 0 st:-1 flags:1 ts: 0.624171
ret: 0 st: 0 flags:1 dts: 0.400000 pts: NOPTS pos: 211968 size: 24787
ret: 0 st: 0 flags:1 dts: 0.360000 pts: 0.480000 pos: 211968 size: 24787
ret: 0 st: 0 flags:0 ts:-0.480000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: NOPTS pos: 6144 size: 24801
ret: 0 st: 0 flags:1 dts:-0.040000 pts: 0.000000 pos: 6144 size: 24801
ret: 0 st: 0 flags:1 ts: 2.400000
ret: 0 st: 0 flags:1 dts: 0.880000 pts: NOPTS pos: 460800 size: 24712
ret: 0 st: 0 flags:1 dts: 0.840000 pts: 0.960000 pos: 460800 size: 24712
ret:-1 st: 1 flags:0 ts: 1.320000
ret: 0 st: 1 flags:1 ts: 0.200000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: NOPTS pos: 6144 size: 24801
ret: 0 st: 0 flags:1 dts:-0.040000 pts: 0.000000 pos: 6144 size: 24801
ret: 0 st:-1 flags:0 ts:-0.904994
ret: 0 st: 0 flags:1 dts: 0.000000 pts: NOPTS pos: 6144 size: 24801
ret: 0 st: 0 flags:1 dts:-0.040000 pts: 0.000000 pos: 6144 size: 24801
ret: 0 st:-1 flags:1 ts: 1.989173
ret: 0 st: 0 flags:1 dts: 0.880000 pts: NOPTS pos: 460800 size: 24712
ret: 0 st: 0 flags:1 dts: 0.840000 pts: 0.960000 pos: 460800 size: 24712
ret: 0 st: 0 flags:0 ts: 0.880000
ret: 0 st: 0 flags:1 dts: 0.880000 pts: NOPTS pos: 460800 size: 24712
ret: 0 st: 0 flags:1 dts: 0.840000 pts: 0.960000 pos: 460800 size: 24712
ret: 0 st: 0 flags:1 ts:-0.240000
ret: 0 st: 0 flags:1 dts: 0.000000 pts: NOPTS pos: 6144 size: 24801
ret: 0 st: 0 flags:1 dts:-0.040000 pts: 0.000000 pos: 6144 size: 24801
ret:-1 st: 1 flags:0 ts: 2.680000
ret: 0 st: 1 flags:1 ts: 1.560000
ret: 0 st: 0 flags:1 dts: 0.880000 pts: NOPTS pos: 460800 size: 24712
ret: 0 st: 0 flags:1 dts: 0.840000 pts: 0.960000 pos: 460800 size: 24712
ret: 0 st:-1 flags:0 ts: 0.460008
ret: 0 st: 0 flags:1 dts: 0.880000 pts: NOPTS pos: 460800 size: 24712
ret: 0 st: 0 flags:1 dts: 0.840000 pts: 0.960000 pos: 460800 size: 24712
ret: 0 st:-1 flags:1 ts:-0.645825
ret: 0 st: 0 flags:1 dts: 0.000000 pts: NOPTS pos: 6144 size: 24801
ret: 0 st: 0 flags:1 dts:-0.040000 pts: 0.000000 pos: 6144 size: 24801