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:   2011-04-18
libavformat:   2012-01-27
libavresample: 2012-04-24
libswscale:    2011-06-20
libavutil:     2011-04-18


API changes, most recent first:

2012-xx-xx - xxxxxxx - lavfi 2.23.0 - avfilter.h
  Add AVFilterContext.nb_inputs/outputs. Deprecate
  AVFilterContext.input/output_count.

2012-xx-xx - xxxxxxx - 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-xx-xx - xxxxxxx - 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 - e0e0793 - lavu 51.31.0 - opt.h
  Add av_opt_set_bin()

2012-05-xx - xxxxxxx - 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()

2012-03-06 - 4d851f8 - lavu 51.25.0 - cpu.h
  Add av_set_cpu_flags_mask().

2012-03-05 - lavc 54.8.0
  6699d07 Add av_get_exact_bits_per_sample()
  9524cf7 Add av_get_audio_frame_duration()

2012-03-04 - 44fe77b - lavc 54.7.0 - avcodec.h
  Add av_codec_is_encoder/decoder().

2012-03-01 - 442c132 - lavc 54.3.0 - avcodec.h
  Add av_packet_shrink_side_data.

2012-02-29 - dd2a4bc - lavf 54.2.0 - avformat.h
  Add AVStream.attached_pic and AV_DISPOSITION_ATTACHED_PIC,
  used for dealing with attached pictures/cover art.

2012-02-25 - c9bca80 - lavu 51.24.0 - error.h
  Add AVERROR_UNKNOWN
  NOTE: this was backported to 0.8

2012-02-20 - e9cda85 - lavc 54.2.0
  Add duration field to AVCodecParserContext

2012-02-20 - 0b42a93 - lavu 51.23.1 - mathematics.h
  Add av_rescale_q_rnd()

2012-02-08 - 38d5533 - lavu 51.22.1 - pixdesc.h
  Add PIX_FMT_PSEUDOPAL flag.

2012-02-08 - 52f82a1 - lavc 54.01.0
  Add avcodec_encode_video2() and deprecate avcodec_encode_video().

2012-02-01 - 316fc74 - lavc 54.01.0
  Add av_fast_padded_malloc() as alternative for av_realloc() when aligned
  memory is required. The buffer will always have FF_INPUT_BUFFER_PADDING_SIZE
  zero-padded bytes at the end.

2012-01-31 - dd6d3b0 - lavf 54.01.0
  Add avformat_get_riff_video_tags() and avformat_get_riff_audio_tags().
  NOTE: this was backported to 0.8

2012-01-31 - af08d9a - lavc 54.01.0
  Add avcodec_is_open() function.
  NOTE: this was backported to 0.8

2012-01-30 - 8b93312 - lavu 51.22.0 - intfloat.h
  Add a new installed header libavutil/intfloat.h with int/float punning
  functions.
  NOTE: this was backported to 0.8

2012-01-25 - lavf 53.22.0
  f1caf01 Allow doing av_write_frame(ctx, NULL) for flushing possible
          buffered data within a muxer. Added AVFMT_ALLOW_FLUSH for
          muxers supporting it (av_write_frame makes sure it is called
          only for muxers with this flag).

------------------------------8<-------------------------------------
                   0.8 branch was cut here
----------------------------->8--------------------------------------

2012-01-15 - lavc 53.34.0
  New audio encoding API:
  b2c75b6 Add CODEC_CAP_VARIABLE_FRAME_SIZE capability for use by audio
          encoders.
  5ee5fa0 Add avcodec_fill_audio_frame() as a convenience function.
  b2c75b6 Add avcodec_encode_audio2() and deprecate avcodec_encode_audio().
          Add AVCodec.encode2().

2012-01-12 - 3167dc9 - lavfi 2.15.0
  Add a new installed header -- libavfilter/version.h -- with version macros.

2011-01-03 - b73ec05 - lavu 51.21.0
  Add av_popcount64

2011-12-25 - lavfi 2.14.0
  e1d9dbf Add a new installed header - buffersrc.h
  It contains a new function av_buffersrc_buffer() that allows passing
  frames to the 'buffer' filter, but unlike av_vsrc_buffer_add_frame()
  it allows for direct rendering.
  1c9e340 Add avfilter_copy_frame_props() for copying properties from
  AVFrame to AVFilterBufferRef.

2011-12-25 - lavc 53.31.0
  Add the following new fields to AVFrame:
    b58dbb5 sample_aspect_ratio
    3a2ddf7 width, height
    8a4a5f6 format

2011-12-18 - 8400b12 - lavc 53.28.1
  Deprecate AVFrame.age. The field is unused.

2011-12-12 - 5266045 - lavf 53.17.0
  Add avformat_close_input().
  Deprecate av_close_input_file() and av_close_input_stream().

2011-12-02 - 0eea212 - lavc 53.25.0
  Add nb_samples and extended_data fields to AVFrame.
  Deprecate AVCODEC_MAX_AUDIO_FRAME_SIZE.
  Deprecate avcodec_decode_audio3() in favor of avcodec_decode_audio4().
  avcodec_decode_audio4() writes output samples to an AVFrame, which allows
  audio decoders to use get_buffer().

2011-12-04 - 560f773 - lavc 53.24.0
  Change AVFrame.data[4]/base[4]/linesize[4]/error[4] to [8] at next major bump.
  Change AVPicture.data[4]/linesize[4] to [8] at next major bump.
  Change AVCodecContext.error[4] to [8] at next major bump.
  Add AV_NUM_DATA_POINTERS to simplify the bump transition.

2011-11-23 - bbb46f3 - lavu 51.18.0
  Add av_samples_get_buffer_size(), av_samples_fill_arrays(), and