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avformat/mpegts: tag video streams with still images

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Parses the video_stream_descriptor (H.222 2.6.2) to look
for the still_picture_flag. This is exposed to the user
via a new AV_DISPOSITION_STILL_IMAGE.

See for example https://tmm1.s3.amazonaws.com/music-choice.ts,
whose video stream only updates every ~6 seconds.

Signed-off-by: Aman Gupta <aman@tmm1.net>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Aman Gupta 2018-05-15 11:26:07 -07:00
parent 2734f8d63a
commit 5dfeb7f081
5 changed files with 13 additions and 2 deletions
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3
doc/APIchanges
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@ -15,6 +15,9 @@ libavutil: 2017-10-21
API changes, most recent first:
2018-05-xx - xxxxxxxxxx - lavf 58.14.100 - avformat.h
Add AV_DISPOSITION_STILL_IMAGE
2018-05-xx - xxxxxxxxxx - lavu 56.18.101 - hwcontext_cuda.h
Add AVCUDADeviceContext.stream.

1
libavformat/avformat.h
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@ -846,6 +846,7 @@ typedef struct AVStreamInternal AVStreamInternal;
#define AV_DISPOSITION_DESCRIPTIONS 0x20000
#define AV_DISPOSITION_METADATA 0x40000
#define AV_DISPOSITION_DEPENDENT 0x80000 ///< dependent audio stream (mix_type=0 in mpegts)
#define AV_DISPOSITION_STILL_IMAGE 0x100000 ///< still images in video stream (still_picture_flag=1 in mpegts)
/**
* Options for behavior on timestamp wrap detection.

2
libavformat/dump.c
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@ -551,6 +551,8 @@ static void dump_stream_format(AVFormatContext *ic, int i,
av_log(NULL, AV_LOG_INFO, " (descriptions)");
if (st->disposition & AV_DISPOSITION_DEPENDENT)
av_log(NULL, AV_LOG_INFO, " (dependent)");
if (st->disposition & AV_DISPOSITION_STILL_IMAGE)
av_log(NULL, AV_LOG_INFO, " (still image)");
av_log(NULL, AV_LOG_INFO, "\n");
dump_metadata(NULL, st->metadata, " ");

5
libavformat/mpegts.c
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@ -1683,6 +1683,11 @@ int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type
mpegts_find_stream_type(st, desc_tag, DESC_types);
switch (desc_tag) {
case 0x02: /* video stream descriptor */
if (get8(pp, desc_end) & 0x1) {
st->disposition |= AV_DISPOSITION_STILL_IMAGE;
}
break;
case 0x1E: /* SL descriptor */
desc_es_id = get16(pp, desc_end);
if (desc_es_id < 0)

4
libavformat/version.h
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@ -32,8 +32,8 @@
// Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
// Also please add any ticket numbers that you believe might be affected here
#define LIBAVFORMAT_VERSION_MAJOR 58
#define LIBAVFORMAT_VERSION_MINOR 13
#define LIBAVFORMAT_VERSION_MICRO 102
#define LIBAVFORMAT_VERSION_MINOR 14
#define LIBAVFORMAT_VERSION_MICRO 100
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \