avformat: Avoid allocation for AVFormatInternal

Do this by allocating AVFormatContext together with the data that is
currently in AVFormatInternal; or rather: Put AVFormatContext at the
beginning of a new structure called FFFormatContext (which encompasses
more than just the internal fields and is a proper context in its own
right, hence the name) and remove AVFormatInternal altogether.

The biggest simplifications occured in avformat_alloc_context(), where
one can now simply call avformat_free_context() in case of errors.

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

1 files changed, 2 insertions, 1 deletions

diff --git a/libavformat/flacdec.c b/libavformat/flacdec.c
index 2060b48c69..ffa7e38561 100644
--- a/libavformat/flacdec.c
+++ b/libavformat/flacdec.c
@@ -258,7 +258,8 @@ static int flac_probe(const AVProbeData *p)
 static av_unused int64_t flac_read_timestamp(AVFormatContext *s, int stream_index,
                                              int64_t *ppos, int64_t pos_limit)
 {
-    AVPacket *pkt = s->internal->parse_pkt;
+    FFFormatContext *const si = ffformatcontext(s);
+    AVPacket *const pkt = si->parse_pkt;
     AVStream *st = s->streams[stream_index];
     AVCodecParserContext *parser;
     int ret;