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skip run in sequence, fix C0023S01.mxf

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Originally committed as revision 6720 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier
2006-10-17 11:23:04 +00:00
parent cc6a90dd49
commit ee71ef5cf4
1 changed files with 25 additions and 15 deletions
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34
libavformat/mxf.c
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@ -943,11 +943,29 @@ static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
{ { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL }, { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL },
}; };
static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)
{
int i, b;
for (i = 0; i < size && !url_feof(pb); i++) {
b = get_byte(pb);
if (b == key[0])
i = 0;
else if (b != key[i])
i = -1;
}
return i == size;
}
static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap) static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
{ {
MXFContext *mxf = s->priv_data; MXFContext *mxf = s->priv_data;
KLVPacket klv; KLVPacket klv;
if (!mxf_read_sync(&s->pb, mxf_header_partition_pack_key, 14)) {
av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
return -1;
}
url_fseek(&s->pb, -14, SEEK_CUR);
mxf->fc = s; mxf->fc = s;
while (!url_feof(&s->pb)) { while (!url_feof(&s->pb)) {
const MXFMetadataReadTableEntry *function; const MXFMetadataReadTableEntry *function;
@ -1031,7 +1049,6 @@ static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_ti
{ {
AVStream *st = s->streams[stream_index]; AVStream *st = s->streams[stream_index];
int64_t seconds; int64_t seconds;
int i;
if (!s->bit_rate) if (!s->bit_rate)
return -1; return -1;
@ -1039,21 +1056,14 @@ static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_ti
sample_time = 0; sample_time = 0;
seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den); seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET); url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
/* sync on KLV essence element */ if (!mxf_read_sync(&s->pb, mxf_essence_element_key, 12))
for (i = 0; i < 12 && url_ftell(&s->pb) < s->file_size; i++) { return -1;
int b = get_byte(&s->pb);
if (b == mxf_essence_element_key[0]) /* found KLV key */
i = 0;
else if (b != mxf_essence_element_key[i])
i = -1;
}
if (i == 12) { /* found KLV key */
url_fseek(&s->pb, -12, SEEK_CUR); url_fseek(&s->pb, -12, SEEK_CUR);
av_update_cur_dts(s, st, sample_time); av_update_cur_dts(s, st, sample_time);
return 0; return 0;
} }
return -1;
}
AVInputFormat mxf_demuxer = { AVInputFormat mxf_demuxer = {
"mxf", "mxf",