| Commit message (Collapse) | Author | Age |
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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.
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The stream parameters are not known until we read a packet, so postpone
creating it until then.
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If we really want to support parameter changes, they need to be
signalled along with the AVPackets as parameter change side data,
not just changing the AVCodecContext parameters when a packet
is demuxed (since there may be other earlier packets yet undecoded).
Something similar was already done for the sample rate in 0883109b2,
but some parameters were left changeable.
This avoids having to recheck the channel count for validity for
each decoded frame in (ad)pcm decoders, unless the decoders
explicitly say that they accept parameter changes.
Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
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Also add missing trailing commas, break long codec_tag lines and
add spaces in codec_tag declarations.
Signed-off-by: Martin Storsjö <martin@martin.st>
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Also, set the time base based on the sample rate.
lavf-voc seek test updated to reflect slightly different seek points.
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Prefix the functions/tables brktimegm, pcm_read_seek,
dv_offset_reset, voc_get_packet, codec_movaudio_tags,
codec_movvideo_tags.
After this, lavf has no global symbols without the proper prefix.
Signed-off-by: Martin Storsjö <martin@martin.st>
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Trivial replacements with sed are done in this commit:
sed 's/av_new_stream(\([^)]*\), 0)/avformat_new_stream(\1, NULL)/'
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It's more readable and less prone to breakage.
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Use it instead of url_is_streamed and AVIOContext.is_streamed.
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Signed-off-by: Mans Rullgard <mans@mansr.com>
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Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
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Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
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Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
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Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
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In the name of consistency:
get_byte -> avio_r8
get_<type> -> avio_r<type>
get_buffer -> avio_read
get_partial_buffer will be made private later
get_strz is left out becase I want to change it later to return
something useful.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
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Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
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This also lists the objects from those two libraries as internal (by adding
the ff_ prefix) so that they can then be hidden via linker scripts.
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This fixes demuxing of packets that do not contain a codec tag and come before the codec_id has been set.
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Fixes issue 2560.
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Patch by Daniel Kang, daniel.d.kang at gmail
Originally committed as revision 26309 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Patch by Francesco Lavra, francescolavra interfree it
Originally committed as revision 23250 to svn://svn.ffmpeg.org/ffmpeg/trunk
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is deprecated and will be dropped at the next major bump.
Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 20596 to svn://svn.ffmpeg.org/ffmpeg/trunk
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patch by Daniel Verkamp, aniel drv nu
Originally committed as revision 19254 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 16556 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 16067 to svn://svn.ffmpeg.org/ffmpeg/trunk
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bits_per_coded_sample but that cannot be done seperately.
Patch by Luca Abeni
Also reset the minor version and fix the forgotton change to libfaad.
Note: The API/ABI should not be considered stable yet, there still may
be a change done here or there if some developer has some cleanup ideas and
patches!
Originally committed as revision 15262 to svn://svn.ffmpeg.org/ffmpeg/trunk
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AVCodecTag * const *
Originally committed as revision 14947 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 14945 to svn://svn.ffmpeg.org/ffmpeg/trunk
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patch by Stefano Sabatini, stefano.sabatini-lala poste.it
along with some spelling/consistency fixes for the long names by me
Originally committed as revision 13649 to svn://svn.ffmpeg.org/ffmpeg/trunk
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patch by: Björn Axelsson, bjorn d axelsson a intinor d se
thread: [PATCH] Remove static ByteIOContexts, 06 nov 2007
Originally committed as revision 11071 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 9763 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 9760 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 9759 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 9484 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 9398 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 9397 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 9395 to svn://svn.ffmpeg.org/ffmpeg/trunk
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buf_size checks
Originally committed as revision 8677 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 8275 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 8274 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 7596 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 7594 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 7146 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Originally committed as revision 7145 to svn://svn.ffmpeg.org/ffmpeg/trunk
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