APIchanges

Never assume the API of libav* to be stable unless at least 1 month has passed
since the last major version increase.

The last version increases were:
libavcodec:    2012-01-27
libavdevice:   2011-04-18
libavfilter:   2012-06-22
libavformat:   2012-01-27
libavresample: 2012-10-05
libswscale:    2011-06-20
libavutil:     2012-10-22


API changes, most recent first:

2013-01-xx - xxxxxxx - lavu 52.5.0 - hmac.h
  Add AVHMAC.

2013-01-13 - xxxxxxx - lavc 54.36.0 - vdpau.h
  Add AVVDPAUContext struct for VDPAU hardware-accelerated decoding.

2013-01-12 - 169fb94 - lavu 52.4.0 - pixdesc.h
  Add AV_PIX_FMT_VDPAU flag.

2013-01-07 - 074a00d - lavr 1.1.0
  Add avresample_set_channel_mapping() for input channel reordering,
  duplication, and silencing.

2012-12-29 - d8fd06c - lavu 52.3.0 - avstring.h
  Add av_basename() and av_dirname().

2012-11-11 - 5980f5d - lavu 52.2.0 - audioconvert.h
  Rename audioconvert.h to channel_layout.h. audioconvert.h is now deprecated.

2012-11-05 - dfde8a3 - lavu 52.1.0 - intmath.h
  Add av_ctz() for trailing zero bit count

2012-10-21 - a893655 - lavu 51.45.0 - error.h
  Add AVERROR_EXPERIMENTAL

2012-10-12 - d2fcb35 - lavu 51.44.0 - pixdesc.h
  Add functions for accessing pixel format descriptors.
  Accessing the av_pix_fmt_descriptors array directly is now
  deprecated.

2012-10-11 - 9a92aea - lavu 51.43.0 - aes.h, md5.h, sha.h, tree.h
  Add functions for allocating the opaque contexts for the algorithms,
  deprecate the context size variables.

2012-10-10 - b522000 - lavf 54.18.0 - avio.h
  Add avio_closep to complement avio_close.

2012-10-08 - 78071a1 - lavu 51.42.0 - pixfmt.h
  Rename PixelFormat to AVPixelFormat and all PIX_FMT_* to AV_PIX_FMT_*.
  To provide backwards compatibility, PixelFormat is now #defined as
  AVPixelFormat.
  Note that this can break user code that includes pixfmt.h and uses the
  'PixelFormat' identifier. Such code should either #undef PixelFormat
  or stop using the PixelFormat name.

2012-10-05 - e7ba5b1 - lavr 1.0.0 - avresample.h
  Data planes parameters to avresample_convert() and
  avresample_read() are now uint8_t** instead of void**.
  Libavresample is now stable.

2012-09-24 - a42aada - lavc 54.28.0 - avcodec.h
  Add avcodec_free_frame(). This function must now
  be used for freeing an AVFrame.

2012-09-12 - 8919fee - lavu 51.41.0 - audioconvert.h
  Added AV_CH_LOW_FREQUENCY_2 channel mask value.

2012-09-04 - 686a329 - lavu 51.40.0 - opt.h
  Reordered the fields in default_val in AVOption, changed which
  default_val field is used for which AVOptionType.

2012-08-30 - a231832 - lavc 54.26.1 - avcodec.h
  Add codec descriptor properties AV_CODEC_PROP_LOSSY and
  AV_CODEC_PROP_LOSSLESS.

2012-08-18 - lavc 54.26 - avcodec.h
  Add codec descriptors for accessing codec properties without having
  to refer to a specific decoder or encoder.

  c223d79 - Add an AVCodecDescriptor struct and functions
            avcodec_descriptor_get() and avcodec_descriptor_next().
  51efed1 - Add AVCodecDescriptor.props and AV_CODEC_PROP_INTRA_ONLY.
  91e59fe - Add avcodec_descriptor_get_by_name().


2012-08-08 - 1d9c2dc - lavu 51.39 - avutil.h
  Don't implicitly include libavutil/common.h in avutil.h

2012-08-08 - 987170c - lavu 51.38 - dict.h
  Add av_dict_count().

2012-08-07 - 104e10f - lavc 54.25 - avcodec.h
  Rename CodecID to AVCodecID and all CODEC_ID_* to AV_CODEC_ID_*.
  To provide backwards compatibility, CodecID is now #defined as AVCodecID.
  Note that this can break user code that includes avcodec.h and uses the
  'CodecID' identifier. Such code should either #undef CodecID or stop using the
  CodecID name.

2012-08-03 - 239fdf1 - lavu 51.37.1 - cpu.h
                       lsws 2.1.1   - swscale.h
  Rename AV_CPU_FLAG_MMX2  ---> AV_CPU_FLAG_MMXEXT.
  Rename SWS_CPU_CAPS_MMX2 ---> SWS_CPU_CAPS_MMXEXT.

2012-07-29 - 681ed00 - lavf 54.13.0 - avformat.h
  Add AVFMT_FLAG_NOBUFFER for low latency use cases.

2012-07-20 - b70d89a - lavfi 3.0.0 - avfilter.h
  Add avfilter_unref_bufferp().

2012-07-10 - 5fade8a - lavu 51.37.0
  Add av_malloc_array() and av_mallocz_array()

2012-06-22 - d3d3a32 - lavu 51.34.0
  Add av_usleep()

2012-06-20 - ae0a301 - lavu 51.33.0
  Move av_gettime() to libavutil, add libavutil/time.h

2012-06-09 - 3971be0 - lavr 0.0.3
  Add a parameter to avresample_build_matrix() for Dolby/DPLII downmixing.

2012-06-12 - 9baeff9 - lavfi 2.23.0 - avfilter.h
  Add AVFilterContext.nb_inputs/outputs. Deprecate
  AVFilterContext.input/output_count.

2012-06-12 - 84b9fbe - lavfi 2.22.0 - avfilter.h
  Add avfilter_pad_get_type() and avfilter_pad_get_name(). Those
  should now be used instead of accessing AVFilterPad members
  directly.

2012-06-12 - b0f0dfc - lavu 51.32.0 - audioconvert.h
  Add av_get_channel_layout_channel_index(), av_get_channel_name()
  and av_channel_layout_extract_channel().

2012-05-25 - 154486f - lavu 51.31.0 - opt.h
  Add av_opt_set_bin()

2012-05-26 - e9cef89 - lavf 54.3.0
  Add AVFMT_TS_NONSTRICT format flag to indicate that a muxer supports
  non-increasing monotone timestamps.

2012-05-15 - lavfi 2.17.0
  Add support for audio filters
  ac71230/a2cd9be - add video/audio buffer sink in a new installed
                    header buffersink.h
  720c6b7 - add av_buffersrc_write_frame(), deprecate
            av_vsrc_buffer_add_frame()
  ab16504 - add avfilter_copy_buf_props()
  9453c9e - add extended_data to AVFilterBuffer
  1b8c927 - add avfilter_get_audio_buffer_ref_from_arrays()

2012-05-09 - lavu 51.30.0 - samplefmt.h
  142e740 - add av_samples_copy()
  6d7f617 - add av_samples_set_silence()

2012-05-09 - a5117a2 - lavc 54.13.1
  For audio formats with fixed frame size, the last frame
  no longer needs to be padded with silence, libavcodec
  will handle this internally (effectively all encoders
  behave as if they had CODEC_CAP_SMALL_LAST_FRAME set).

2012-05-07 - 828bd08 - lavc 54.13.0 - avcodec.h
  Add sample_rate and channel_layout fields to AVFrame.

2012-05-01 - 4010d72 - lavr 0.0.1
  Change AV_MIX_COEFF_TYPE_Q6 to AV_MIX_COEFF_TYPE_Q8.

2012-04-25 - 3527a73 - lavu 51.29.0 - cpu.h
  Add av_parse_cpu_flags()

2012-04-24 - c8af852 - lavr 0.0.0
  Add libavresample audio conversion library

2012-04-20 - 0c0d1bc - lavu 51.28.0 - audio_fifo.h
  Add audio FIFO functions:
    av_audio_fifo_free()
    av_audio_fifo_alloc()
    av_audio_fifo_realloc()
    av_audio_fifo_write()
    av_audio_fifo_read()
    av_audio_fifo_drain()
    av_audio_fifo_reset()
    av_audio_fifo_size()
    av_audio_fifo_space()

2012-04-14 - lavfi 2.16.0 - avfiltergraph.h
  d7bcc71 Add avfilter_graph_parse2().
  91d3cbe Add avfilter_inout_alloc() and avfilter_inout_free().

2012-04-08 - 4d693b0 - lavu 51.27.0 - samplefmt.h
  Add av_get_packed_sample_fmt() and av_get_planar_sample_fmt()

2012-04-05 - 5cc51a5 - lavu 51.26.0 - audioconvert.h
  Add av_get_default_channel_layout()