This is more correct and avoids breaking extended_data.

This is more correct and avoids breaking extended_data.

CC:libav-stable@libav.org

sws_getCachedContext() and sws_getContext() expect sws_alloc_context()
to return NULL when out of memory, as follows.

    if (!(context = sws_alloc_context()))
        return NULL;

This patch fixes sws_alloc_context() to return NULL in that case.
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

The following out-of-memory check is broken.

    *sorted_segments  = av_mallocz(...);
    if (!sorted_segments) { ... }

The correct NULL check should use *sorted_segments.
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Add a paragraph about MSVC and mention 24-bit FLAC encoding.

Based on a patch by Jan Gerber <j@v2v.cc>

Signed-off-by: Peter Meerwald <p.meerwald@bct-electronic.com>
Signed-off-by: Martin Storsjö <martin@martin.st>

This makes RTP custom IO work properly with pure read-only
AVIOContexts as well.
Signed-off-by: Martin Storsjö <martin@martin.st>

To use this, set sdpflags=custom_io to the sdp demuxer. During
the avformat_open_input call, the SDP is read from the AVFormatContext
AVIOContext (ctx->pb) - after the avformat_open_input call,
during the av_read_frame() calls, the same ctx->pb is used for reading
packets (and sending back RTCP RR packets).

Normally, one would use this with a read-only AVIOContext for the
SDP during the avformat_open_input call, then close that one and
replace it with a read-write one for the packets after the
avformat_open_input call has returned.

This allows using the RTP depacketizers as "pure" demuxers, without
having them tied to the libavformat network IO.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>