Forgotten in 672946c7

This has been cargo culted from mpegvideo and serves no useful purpose.
It will be initialize correctly in h264_field_start()

The name is misleading, this function does a lot more than just flushing
the DPB.

It represents the relationship between them more naturally and will be
useful in the following commits.

Allows significantly more frames in fate-h264-attachment-631 to be
decoded.

Those SEIs refer to the currently active SPS. However, since the SEI
NALUs precede the coded picture data in the bitstream, the active SPS is
in general not known when we are decoding the SEI.

Therefore, store the content of the picture timing SEIs and actually
parse it when the active SPS is known.

This tells the parsing functions the payload size and prevents them from
overreading.

Such errors are not necessarily fatal and decoding might still be
possible, e.g. it happens for MVC streams where we do not handle the
subset SPS thus failing to parse its corresponding PPS.

Currently the frame pool used by the default get_buffer2()
implementation is a single struct, allocated when opening the decoder.
A pointer to it is simply copied to each frame thread and we assume that
no thread attempts to modify it at an unexpected time. This is rather
fragile and potentially dangerous.

With this commit, the frame pool is made refcounted, with the reference
being propagated across threads along with other context variables. The
frame pool is now also immutable - when the stream parameters change we
drop the old reference and create a new one.

This is extremely fragile against reordering and hides what is actually
being copied. Copy all the fields manually instead.

Use the AVFrame API to properly allocate and free frames for delayed
release.

Specifically, between the user-facing one and the first frame thread
one.

This is fragile and dangerous, allocate separate private data for each
per-thread context.

The current design, where
- proper init is called for the first per-thread context
- first thread's private data is copied into private data for all the
  other threads
- a "fixup" function is called for all the other threads to e.g.
  allocate dynamically allocated data
is very fragile and hard to follow, so it is abandoned. Instead, the
same init function is used to init each per-thread context. Where
necessary, AVCodecInternal.is_copy can be used to differentiate between
the first thread and the other ones (e.g. for decoding the extradata
just once).

This is a constant codec property, so a capability flag is more appropriate.

This is extremely fragile against reordering and hides what is actually
being copied. Copy all the fields manually instead.

Fix invalid memory access on DSD streams with changing channel count.

Merge ff_get_buffer() and get_buffer_internal() to simplify the code.

Signed-off-by: Linjie Fu <linjie.fu@intel.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Fix ticket: 8606
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>

subtitles.h has been included in order to use ff_subtitles_next_line()
to help parsing srt subtitles which at that time had their timing as
part of the payload and not as part of the AVPacket fields. When this
changed (in 55180b32) it has been forgotten to remove this header.

libavcodec/internal.h meanwhile has been added in bb47aa58 and has
never been used at all.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

vobsub_read_packet() didn't check whether an array of AVPackets was
valid and therefore used uninitialized values.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This patch adds functional changes to support the
PPT marker. This patch fixes bug ticket #4610.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Reviewed-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Andriy Gelman <andriy.gelman@gmail.com>

soft float systems do not define these macros under musl.

Fixes: Ticket7102
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: Marton Balint <cus@passwd.hu>

Signed-off-by: Limin Wang <lance.lmwang@gmail.com>

Removes code duplication.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

Test with the following command for the webvtt subtitle:
$ ./ffmpeg -y -i input_with_subtitle.mkv \
 -b:v:0 5250k -c:v h264 -pix_fmt yuv420p -profile:v main -level 4.1 \
 -b:a:0 256k \
 -c:s webvtt -c:a mp2 -ar 48000 -ac 2 -map 0:v -map 0:a:0 -map 0:s:0 \
 -f hls -var_stream_map "v:0,a:0,s:0,sgroup:subtitle" \
 -master_pl_name master.m3u8 -t 300 -hls_time 10 -hls_init_time 4 -hls_list_size \
 10 -master_pl_publish_rate 10  -hls_flags \
 delete_segments+discont_start+split_by_time ./tmp/video.m3u8

Check the master m3u8:
$ cat tmp/master.m3u8
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subtitle",NAME="subtitle_0",DEFAULT=YES,URI="video_vtt.m3u8"
#EXT-X-STREAM-INF:BANDWIDTH=6056600,RESOLUTION=1280x720,CODECS="avc1.4d4829,mp4a.40.33",SUBTITLES="subtitle"
video.m3u8

Check the result by convert to mkv:
$ ./ffmpeg -strict experimental -i ./tmp/master.m3u8 -c:v copy -c:a mp2 -c:s srt ./test.mkv
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>

Signed-off-by: Limin Wang <lance.lmwang@gmail.com>

Please testing with the following command:
./ffmpeg -y -i input.mkv \
 -b:v:0 5250k -c:v h264 -pix_fmt yuv420p -profile:v main -level 4.1 \
 -b:a:0 256k \
 -c:a mp2 -ar 48000 -ac 2 -map 0:v -map 0:a:0\
 -f hls -var_stream_map "v:0,a:0" \
 -master_pl_name master.m3u8 -t 300 -hls_time 10 -hls_init_time 4 -hls_list_size \
 10 -master_pl_publish_rate 10  -hls_flags \
 delete_segments+discont_start+split_by_time ./tmp/video.m3u8

then cat ./tmp/master.m3u8
before:
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:BANDWIDTH=6056600,RESOLUTION=1280x720,CODECS="avc1.4d4829,mp4a.40.33"
/video.m3u8

$ ./ffmpeg -i  ./tmp/master.m3u8 -c:v copy -c:a mp2 ./test.mkv
[hls @ 0x7f82f9000000] Skip ('#EXT-X-VERSION:3')
[hls @ 0x7f82f9000000] Opening '/video.m3u8' for reading
[hls @ 0x7f82f9000000] parse_playlist error No such file or directory [/video.m3u8]
./tmp/master.m3u8: No such file or directory

after:
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:BANDWIDTH=6056600,RESOLUTION=1280x720,CODECS="avc1.4d4829,mp4a.40.33"
video.m3u8
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>

when deleting old segments.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

if the directory name of the segments contains "%v".

This memleak is caused by masking the pointer that will eventually
be freed by a variable of the same name in a smaller scope.
Therefore the pointer that gets freed is always NULL when it is
freed and the allocated data leaks.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>