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Code Issues Releases Activity

avformat/mxfdec: fix opAtom audio demuxing

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Consider edit rate when determining edit_units_per_packet and also make sure
that checks are done in edit rate time base and not in stream time base.

Fixes some errors reported with the sample in ticket #5863.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2018-02-18 01:12:01 +01:00
parent d168e78eff
commit 3aaf97e773
1 changed files with 10 additions and 5 deletions
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15
libavformat/mxfdec.c
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@ -275,7 +275,7 @@ typedef struct MXFContext {
int parsing_backward;
int64_t last_forward_tell;
int last_forward_partition;
int current_edit_unit;
int64_t current_edit_unit;
int nb_index_tables;
MXFIndexTable *index_tables;
int edit_units_per_packet; ///< how many edit units to read at a time (PCM, OPAtom)
@ -2786,6 +2786,7 @@ static AVStream* mxf_get_opatom_stream(MXFContext *mxf)
static void mxf_handle_small_eubc(AVFormatContext *s)
{
MXFContext *mxf = s->priv_data;
MXFTrack *track;
/* assuming non-OPAtom == frame wrapped
* no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */
@ -2805,7 +2806,8 @@ static void mxf_handle_small_eubc(AVFormatContext *s)
/* TODO: We could compute this from the ratio between the audio
* and video edit rates for 48 kHz NTSC we could use the
* 1802-1802-1802-1802-1801 pattern. */
mxf->edit_units_per_packet = 1920;
track = st->priv_data;
mxf->edit_units_per_packet = FFMAX(1, track->edit_rate.num / track->edit_rate.den / 25);
}
/**
@ -3263,7 +3265,7 @@ static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)
* truncate the packet since it's probably very large (>2 GiB is common) */
avpriv_request_sample(s,
"OPAtom misinterpreted as OP1a? "
"KLV for edit unit %i extending into "
"KLV for edit unit %"PRId64" extending into "
"next edit unit",
mxf->current_edit_unit);
klv.length = next_ofs - avio_tell(s->pb);
@ -3307,6 +3309,7 @@ static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
int64_t ret64, pos, next_pos;
AVStream *st;
MXFIndexTable *t;
MXFTrack *track;
int edit_units;
if (mxf->op != OPAtom)
@ -3317,14 +3320,16 @@ static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
if (!st)
return AVERROR_EOF;
track = st->priv_data;
/* OPAtom - clip wrapped demuxing */
/* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */
t = &mxf->index_tables[0];
if (mxf->current_edit_unit >= st->duration)
if (mxf->current_edit_unit >= track->original_duration)
return AVERROR_EOF;
edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);
edit_units = FFMIN(mxf->edit_units_per_packet, track->original_duration - mxf->current_edit_unit);
if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)
return ret;