In order to use ff_audio_rechunk_interleave() (a special interleavement
function for situations where the ordinary "interleave by dts" is not
appropriate), the AVStreams must have private data and this private data
must begin with an AudioInterleaveContext which contains a fifo that may
need to be freed and when ff_audio_interleave_close() was called, it just
assumed that everything has been properly set up, i.e. that every streams
priv_data exists. This implies that this function can not be called from
the deinit function of a muxer, because such functions might be called
if the private data has not been successfully allocated. In order to
change this, add a check for whether the private data exists before
trying to free the fifo in it.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
There is no reason for these functions to modify the given packets at
all.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Currently, AVStream contains an embedded AVCodecContext instance, which
is used by demuxers to export stream parameters to the caller and by
muxers to receive stream parameters from the caller. It is also used
internally as the codec context that is passed to parsers.
In addition, it is also widely used by the callers as the decoding (when
demuxer) or encoding (when muxing) context, though this has been
officially discouraged since Libav 11.
There are multiple important problems with this approach:
- the fields in AVCodecContext are in general one of
* stream parameters
* codec options
* codec state
However, it's not clear which ones are which. It is consequently
unclear which fields are a demuxer allowed to set or a muxer allowed to
read. This leads to erratic behaviour depending on whether decoding or
encoding is being performed or not (and whether it uses the AVStream
embedded codec context).
- various synchronization issues arising from the fact that the same
context is used by several different APIs (muxers/demuxers,
parsers, bitstream filters and encoders/decoders) simultaneously, with
there being no clear rules for who can modify what and the different
processes being typically delayed with respect to each other.
- avformat_find_stream_info() making it necessary to support opening
and closing a single codec context multiple times, thus
complicating the semantics of freeing various allocated objects in the
codec context.
Those problems are resolved by replacing the AVStream embedded codec
context with a newly added AVCodecParameters instance, which stores only
the stream parameters exported by the demuxers or read by the muxers.
Yes this breaks ABI/API but ive already broken it and will bump avutil major
soon.
Originally committed as revision 17869 to svn://svn.ffmpeg.org/ffmpeg/trunk
outside of audiointerleave.c. Also remove the function declaration
from the header as it is now static.
Originally committed as revision 17068 to svn://svn.ffmpeg.org/ffmpeg/trunk
Andreas Rheinhardt
Baptiste Coudurier
Anton Khirnov
Vittorio Giovara
Nidhi Makhijani
Lukasz Marek
Diego Biurrun
Paul B Mahol
Michael Niedermayer
Carl Eugen Hoyos
Mans Rullgard
Stefano Sabatini
Reimar Döffinger