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
libpostproc: 2011-04-18
libswscale:  2011-06-20
libavutil:   2011-04-18


API changes, most recent first:

2012-02-02 - xxxxxxx - lavu 51.37.100
  Add public timecode helpers.

2012-01-24 - xxxxxxx - lavfi 2.60.100
  Add avfilter_graph_dump.

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().

2012-01-31 - af08d9a - lavc 54.01.0
  Add avcodec_is_open() function.

2012-01-30 - 8b93312 - lavu 51.22.0 - intfloat.h
  Add a new installed header libavutil/intfloat.h with int/float punning
  functions.

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).

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.

2011-12-08 - a502939 - lavfi 2.52.0
  Add av_buffersink_poll_frame() to buffersink.h.

2011-12-08 - xxxxxxx - lavu 51.31.0
  Add av_log_format_line.

2011-12-03 - xxxxxxx - lavu 51.30.0
  Add AVERROR_BUG.

2011-xx-xx - xxxxxxx - lavu 51.28.1
  Add av_get_alt_sample_fmt() to samplefmt.h.

2011-11-03 - 96949da - lavu 51.23.0
  Add av_strcasecmp() and av_strncasecmp() to avstring.h.

2011-10-20 - b35e9e1 - lavu 51.22.0
  Add av_strtok() to avstring.h.

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

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
  av_samples_alloc(), to samplefmt.h.

2011-11-23 - 8889cc4 - lavu 51.17.0
  Add planar sample formats and av_sample_fmt_is_planar() to samplefmt.h.

2011-11-19 - f3a29b7 - lavc 53.21.0
  Move some AVCodecContext fields to a new private struct, AVCodecInternal,
  which is accessed from a new field, AVCodecContext.internal.
  - fields moved:
      AVCodecContext.internal_buffer       --> AVCodecInternal.buffer
      AVCodecContext.internal_buffer_count --> AVCodecInternal.buffer_count
      AVCodecContext.is_copy               --> AVCodecInternal.is_copy

2011-11-16 - 6270671 - lavu 51.16.0
  Add av_timegm()

2011-11-13 - lavf 53.15.0
  New interrupt callback API, allowing per-AVFormatContext/AVIOContext
  interrupt callbacks.
  6aa0b98 Add AVIOInterruptCB struct and the interrupt_callback field to
          AVFormatContext.
  1dee0ac Add avio_open2() with additional parameters. Those are
          an interrupt callback and an options AVDictionary.
          This will allow passing AVOptions to protocols after lavf
          54.0.

2011-11-06 - ba04ecf - lavu 51.14.0
  Add av_strcasecmp() and av_strncasecmp() to avstring.h.

2011-11-06 - 07b172f - lavu 51.13.0
  Add av_toupper()/av_tolower()

2011-11-05 - b6d08f4 - lavf 53.13.0
  Add avformat_network_init()/avformat_network_deinit()

2011-10-27 - 512557b - lavc 53.15.0
  Remove avcodec_parse_frame.
  Deprecate AVCodecContext.parse_only and CODEC_CAP_PARSE_ONLY.

2011-10-19 - 569129a - lavf 53.10.0
  Add avformat_new_stream(). Deprecate av_new_stream().

2011-10-13 - b631fba - lavf 53.9.0
  Add AVFMT_NO_BYTE_SEEK AVInputFormat flag.

2011-10-12 - lavu 51.12.0
  AVOptions API rewrite.

  - 145f741 FF_OPT_TYPE* renamed to AV_OPT_TYPE_*
  - new setting/getting functions with slightly different semantics:
        dac66da av_set_string3 -> av_opt_set
                av_set_double  -> av_opt_set_double
                av_set_q       -> av_opt_set_q
                av_set_int     -> av_opt_set_int

        41d9d51 av_get_string  -> av_opt_get
                av_get_double  -> av_opt_get_double
                av_get_q       -> av_opt_get_q
                av_get_int     -> av_opt_get_int

  - 8c5dcaa trivial rename av_next_option -> av_opt_next
  - 641c7af new functions - av_opt_child_next, av_opt_child_class_next
    and av_opt_find2()

2011-09-22 - a70e787 - lavu 51.17.0
  Add av_x_if_null().

2011-09-18 - 645cebb - lavc 53.16.0
  Add showall flag2

2011-09-16 - ea8de10 - lavfi 2.42.0
  Add avfilter_all_channel_layouts.

2011-09-16 - 9899037 - lavfi 2.41.0
  Rename avfilter_all_* function names to avfilter_make_all_*.

  In particular, apply the renames:
  avfilter_all_formats         -> avfilter_make_all_formats
  avfilter_all_channel_layouts -> avfilter_make_all_channel_layouts
  avfilter_all_packing_formats -> avfilter_make_all_packing_formats

2011-09-12 - 4381bdd - lavfi 2.40.0
  Change AVFilterBufferRefAudioProps.sample_rate type from uint32_t to int.

2011-09-12 - 2c03174 - lavfi 2.40.0
  Simplify signature for avfilter_get_audio_buffer(), make it
  consistent with avfilter_get_video_buffer().

2011-09-06 - 4f7dfe1 - lavfi 2.39.0
  Rename libavfilter/vsink_buffer.h to libavfilter/buffersink.h.

2011-09-06 - c4415f6 - lavfi 2.38.0
  Unify video and audio sink API.

  In particular, add av_buffersink_get_buffer_ref(), deprecate
  av_vsink_buffer_get_video_buffer_ref() and change the value for the
  opaque field passed to the abuffersink init function.

2011-09-04 - 61e2e29 - lavu 51.16.0
  Add av_asprintf().

2011-08-22 - dacd827 - lavf 53.10.0
  Add av_find_program_from_stream().