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mxfdec: Add support for Avid indexes

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These indexes duplicate every entry and have the total size of the essence
container as the last entry.
This patch also computes the size of the packets when unknown.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Tomas Härdin 2011-12-09 16:46:38 +01:00 committed by Michael Niedermayer
parent 89cc8c17df
commit 1e14bfc117
1 changed files with 56 additions and 12 deletions
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68
libavformat/mxfdec.c
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@ -1078,10 +1078,33 @@ static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t of
return AVERROR_INVALIDDATA;
}
/**
* Returns the length of the essence container with given BodySID, or zero if unknown
*/
static int64_t mxf_essence_container_length(MXFContext *mxf, int body_sid)
{
int x;
int64_t ret = 0;
for (x = 0; x < mxf->partitions_count; x++) {
MXFPartition *p = &mxf->partitions[x];
if (p->body_sid != body_sid)
continue;
if (!p->essence_length)
return 0;
ret += p->essence_length;
}
return ret;
}
static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st)
{
int64_t accumulated_offset = 0;
int j, k, ret, nb_sorted_segments;
int j, k, l, ret, nb_sorted_segments;
MXFIndexTableSegment **sorted_segments = NULL;
int n_delta = track_id - 1; /* TrackID = 1-based stream index */
@ -1104,11 +1127,18 @@ static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st)
int duration, sample_duration = 1, last_sample_size = 0;
int64_t segment_size;
MXFIndexTableSegment *tableseg = sorted_segments[j];
int index_delta = 1, last_size_unknown = 0;
int64_t last_pos = 0;
/* reset accumulated_offset on BodySID change */
if (j > 0 && tableseg->body_sid != sorted_segments[j-1]->body_sid)
accumulated_offset = 0;
if (tableseg->nb_index_entries == 2 * tableseg->index_duration + 1) {
/* Avid index - duplicate entries and total size as last entry */
index_delta = 2;
}
if (n_delta >= tableseg->nb_delta_entries && st->index != 0)
continue;
duration = tableseg->index_duration > 0 ? tableseg->index_duration :
@ -1132,33 +1162,33 @@ static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st)
goto err_out;
}
for (k = 0; k < duration; k++) {
for (k = l = 0; k < duration; k++, l += index_delta) {
int64_t pos;
int size, flags = 0;
if (k < tableseg->nb_index_entries) {
pos = tableseg->stream_offset_entries[k];
if (l < tableseg->nb_index_entries) {
pos = tableseg->stream_offset_entries[l];
if (n_delta < tableseg->nb_delta_entries) {
if (n_delta < tableseg->nb_delta_entries - 1) {
size =
tableseg->slice_offset_entries[k][tableseg->slice[n_delta+1]-1] +
tableseg->slice_offset_entries[l][tableseg->slice[n_delta+1]-1] +
tableseg->element_delta[n_delta+1] -
tableseg->element_delta[n_delta];
if (tableseg->slice[n_delta] > 0)
size -= tableseg->slice_offset_entries[k][tableseg->slice[n_delta]-1];
} else if (k < duration - 1) {
size = tableseg->stream_offset_entries[k+1] -
tableseg->stream_offset_entries[k] -
tableseg->slice_offset_entries[k][tableseg->slice[tableseg->nb_delta_entries-1]-1] -
size -= tableseg->slice_offset_entries[l][tableseg->slice[n_delta]-1];
} else if (l < tableseg->nb_index_entries - 1) {
size = tableseg->stream_offset_entries[l+1] -
tableseg->stream_offset_entries[l] -
tableseg->slice_offset_entries[l][tableseg->slice[tableseg->nb_delta_entries-1]-1] -
tableseg->element_delta[tableseg->nb_delta_entries-1];
} else
size = 0;
if (tableseg->slice[n_delta] > 0)
pos += tableseg->slice_offset_entries[k][tableseg->slice[n_delta]-1];
pos += tableseg->slice_offset_entries[l][tableseg->slice[n_delta]-1];
pos += tableseg->element_delta[n_delta];
} else
size = 0;
flags = !(tableseg->flag_entries[k] & 0x30) ? AVINDEX_KEYFRAME : 0;
flags = !(tableseg->flag_entries[l] & 0x30) ? AVINDEX_KEYFRAME : 0;
} else {
pos = (int64_t)k * tableseg->edit_unit_byte_count + accumulated_offset;
if (n_delta < tableseg->nb_delta_entries - 1)
@ -1177,6 +1207,12 @@ static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st)
flags = AVINDEX_KEYFRAME;
}
if (last_size_unknown)
st->index_entries[st->nb_index_entries-1].size = pos - last_pos;
last_size_unknown = size == 0;
last_pos = pos;
if (mxf_absolute_bodysid_offset(mxf, tableseg->body_sid, pos, &pos) < 0) {
/* probably partial file - no point going further for this stream */
break;
@ -1188,6 +1224,14 @@ static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st)
if ((ret = av_add_index_entry(st, pos, sample_duration * st->nb_index_entries, size, 0, flags)) < 0)
return ret;
}
if (last_size_unknown) {
int64_t ecl = mxf_essence_container_length(mxf, tableseg->body_sid);
if (ecl > 0)
st->index_entries[st->nb_index_entries-1].size = ecl - last_pos;
}
accumulated_offset += segment_size;
}