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cbs_mpeg2: Decompose Sequence End

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Sequence End units (or actually, sequence_end_codes) have up until now
not been decomposed; in fact due to a bug in cbs_mpeg2_split_fragment they
have mostly been treated as part of the preceding unit. So implement
decomposing them as preparation for fixing said bug.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2019-07-29 21:56:54 +02:00 committed by Mark Thompson
parent ae49993ce6
commit 0e66e1b61e
3 changed files with 19 additions and 0 deletions
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3
libavcodec/cbs_mpeg2.c
View File

@ -269,6 +269,8 @@ static int cbs_mpeg2_read_unit(CodedBitstreamContext *ctx,
extension_data, NULL);
START(MPEG2_START_GROUP, MPEG2RawGroupOfPicturesHeader,
group_of_pictures_header, NULL);
START(MPEG2_START_SEQUENCE_END, MPEG2RawSequenceEnd,
sequence_end, NULL);
#undef START
default:
return AVERROR(ENOSYS);
@ -295,6 +297,7 @@ static int cbs_mpeg2_write_header(CodedBitstreamContext *ctx,
START(MPEG2_START_EXTENSION, MPEG2RawExtensionData, extension_data);
START(MPEG2_START_GROUP, MPEG2RawGroupOfPicturesHeader,
group_of_pictures_header);
START(MPEG2_START_SEQUENCE_END, MPEG2RawSequenceEnd, sequence_end);
#undef START
default:
av_log(ctx->log_ctx, AV_LOG_ERROR, "Write unimplemented for start "

4
libavcodec/cbs_mpeg2.h
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@ -212,6 +212,10 @@ typedef struct MPEG2RawSlice {
AVBufferRef *data_ref;
} MPEG2RawSlice;
typedef struct MPEG2RawSequenceEnd {
uint8_t sequence_end_code;
} MPEG2RawSequenceEnd;
typedef struct CodedBitstreamMPEG2Context {
// Elements stored in headers which are required for other decoding.

12
libavcodec/cbs_mpeg2_syntax_template.c
View File

@ -411,3 +411,15 @@ static int FUNC(slice_header)(CodedBitstreamContext *ctx, RWContext *rw,
return 0;
}
static int FUNC(sequence_end)(CodedBitstreamContext *ctx, RWContext *rw,
MPEG2RawSequenceEnd *current)
{
int err;
HEADER("Sequence End");
ui(8, sequence_end_code);
return 0;
}