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mxfdec: Add "fake" index to MXFIndexTable to assist seeking

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This changes mxf_compute_ptses() to be used for MXFIndexTable, and also adds
code for computing the fake index to it.
This also temporarily disables PTS computation. A future patch will restore it.
This commit is contained in:
Tomas Härdin 2011-12-16 09:42:52 +01:00
parent 8ce41721a4
commit 2212e040b7
2 changed files with 50 additions and 42 deletions
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48
libavformat/mxfdec.c
View File

@ -186,6 +186,7 @@ typedef struct {
int64_t *ptses; /* maps EditUnit -> PTS */
int nb_segments;
MXFIndexTableSegment **segments; /* sorted by IndexStartPosition */
AVIndexEntry *fake_index; /* used for calling ff_index_search_timestamp() */
} MXFIndexTable;
typedef struct {
@ -1139,35 +1140,35 @@ 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)
static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)
{
int ret, i, j, x;
int 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];
for (i = 0; i < index_table->nb_segments; i++) {
MXFIndexTableSegment *s = index_table->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;
index_table->nb_ptses += s->index_duration;
}
/* paranoid check */
if (mxf->nb_ptses <= 0)
if (index_table->nb_ptses <= 0)
return 0;
if (!(mxf->ptses = av_calloc(mxf->nb_ptses, sizeof(int64_t))))
if (!(index_table->ptses = av_calloc(index_table->nb_ptses, sizeof(int64_t))) ||
!(index_table->fake_index = av_calloc(index_table->nb_ptses, sizeof(AVIndexEntry)))) {
av_freep(&index_table->ptses);
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;
for (x = 0; x < index_table->nb_ptses; x++)
index_table->ptses[x] = AV_NOPTS_VALUE;
/**
* We have this:
@ -1196,8 +1197,8 @@ static int mxf_compute_ptses(MXFContext *mxf, MXFIndexTableSegment **sorted_segm
* 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];
for (i = x = 0; i < index_table->nb_segments; i++) {
MXFIndexTableSegment *s = index_table->segments[i];
int index_delta = 1;
if (s->nb_index_entries == 2 * s->index_duration + 1)
@ -1207,19 +1208,22 @@ static int mxf_compute_ptses(MXFContext *mxf, MXFIndexTableSegment **sorted_segm
int offset = s->temporal_offset_entries[j] / index_delta;
int index = x + offset;
if (index < 0 || index >= mxf->nb_ptses) {
index_table->fake_index[x].timestamp = x;
index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;
if (index < 0 || index >= index_table->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;
index_table->ptses[index] = x;
max_temporal_offset = FFMAX(max_temporal_offset, offset);
}
}
mxf->first_dts = -max_temporal_offset;
index_table->first_dts = -max_temporal_offset;
return 0;
}
@ -1282,6 +1286,9 @@ static int mxf_compute_index_tables(MXFContext *mxf)
memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));
t->index_sid = sorted_segments[i]->index_sid;
t->body_sid = sorted_segments[i]->body_sid;
if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)
goto finish_decoding_index;
}
ret = 0;
@ -1496,8 +1503,7 @@ static int mxf_parse_structural_metadata(MXFContext *mxf)
goto fail_and_free;
}
ret = mxf_compute_ptses(mxf, sorted_segments, nb_sorted_segments);
ret = 0;
fail_and_free:
av_free(sorted_segments);
return ret;
@ -1964,8 +1970,10 @@ static int mxf_read_close(AVFormatContext *s)
av_freep(&mxf->local_tags);
av_freep(&mxf->ptses);
for (i = 0; i < mxf->nb_index_tables; i++)
for (i = 0; i < mxf->nb_index_tables; i++) {
av_freep(&mxf->index_tables[i].segments);
av_freep(&mxf->index_tables[i].fake_index);
}
av_freep(&mxf->index_tables);
return 0;

44
tests/ref/seek/lavf_mxf
View File

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