APIchanges

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

The last version increases were:
libavcodec:    2015-08-28
libavdevice:   2015-08-28
libavfilter:   2015-08-28
libavformat:   2015-08-28
libavresample: 2015-08-28
libpostproc:   2015-08-28
libswresample: 2015-08-28
libswscale:    2015-08-28
libavutil:     2015-08-28


API changes, most recent first:

2016-xx-xx - xxxxxxx - lavf 57.25.0 - avformat.h
  Add AVFormatContext.opaque, io_open and io_close, allowing custom IO

2016-02-01 - xxxxxxx - lavf 57.24.100
  Add protocol_whitelist to AVFormatContext, AVIOContext

2016-01-31 - xxxxxxx - lavu 55.17.100
  Add AV_FRAME_DATA_GOP_TIMECODE for exporting MPEG1/2 GOP timecodes.

2016-01-01 - xxxxxxx - lavc 57.21.100 / 57.12.0 - avcodec.h
  Add AVCodecDescriptor.profiles and avcodec_profile_name().

2015-12-28 - xxxxxxx - lavf 57.21.100 - avformat.h
  Add automatic bitstream filtering; add av_apply_bitstream_filters()

2015-12-22 - xxxxxxx - lavfi 6.21.101 - avfilter.h
  Deprecate avfilter_link_set_closed().
  Applications are not supposed to mess with links,
  they should close the sinks.

2015-12-17 - lavc 57.18.100 / 57.11.0 - avcodec.h dirac.h
  xxxxxxx - Add av_packet_add_side_data().
  xxxxxxx - Add AVCodecContext.coded_side_data.
  xxxxxxx - Add AVCPBProperties API.
  xxxxxxx - Add a new public header dirac.h containing
            av_dirac_parse_sequence_header()

2015-12-11 - xxxxxxx - lavf 57.20.100 - avformat.h
  Add av_program_add_stream_index()

2015-11-29 - xxxxxxx - lavc 57.16.101 - avcodec.h
  Deprecate rtp_callback without replacement, i.e. it won't be possible to
  get image slices before the full frame is encoded any more. The libavformat
  rtpenc muxer can still be used for RFC-2190 packetization.

2015-11-xx - xxxxxxx - lavc 57.16.0 - avcodec.h
  Add AV_PKT_DATA_FALLBACK_TRACK for making fallback associations between
  streams.

2015-11-xx - xxxxxxx - lavf 57.19.100 - avformat.h
  Add av_stream_new_side_data().

2015-11-xx - xxxxxxx - lavu 55.8.100 - xtea.h
    Add av_xtea_le_init and av_xtea_le_crypt

2015-11-18 - lavu 55.7.100 - mem.h
  Add av_fast_mallocz()

2015-10-29 - lavc 57.12.100 / 57.8.0 - avcodec.h
  xxxxxx - Deprecate av_free_packet(). Use av_packet_unref() as replacement,
           it resets the packet in a more consistent way.
  xxxxxx - Deprecate av_dup_packet(), it is a no-op for most cases.
           Use av_packet_ref() to make a non-refcounted AVPacket refcounted.
  xxxxxx - Add av_packet_alloc(), av_packet_clone(), av_packet_free().
           They match the AVFrame functions with the same name.

2015-10-27 - xxxxxxx - lavu 55.5.100 - cpu.h
  Add AV_CPU_FLAG_AESNI.

2015-10-22 - xxxxxxx - lavc 57.9.100 / lavc 57.5.0 - avcodec.h
  Add data and linesize array to AVSubtitleRect, to be used instead of
  the ones from the embedded AVPicture.

2015-10-22 - xxxxxxx - lavc 57.8.100 / lavc 57.0.0 - qsv.h
  Add an API for allocating opaque surfaces.

2015-10-15 - xxxxxxx - lavf 57.4.100
  Remove the latm demuxer that was a duplicate of the loas demuxer.

2015-10-14 - xxxxxxx - lavu 55.4.100 / lavu 55.2.0 - dict.h
  Change return type of av_dict_copy() from void to int, so that a proper
  error code can be reported.

2015-09-29 - b01891a / 948f3c1 - lavc 57.3.100 / lavc 57.2.0 - avcodec.h
  Change type of AVPacket.duration from int to int64_t.

2015-09-17 - 7c46f24 / e3d4784 - lavc 57.3.100 / lavc 57.2.0 - d3d11va.h
  Add av_d3d11va_alloc_context(). This function must from now on be used for
  allocating AVD3D11VAContext.

2015-09-15 - lavf 57.2.100 - avformat.h
  probesize and max_analyze_duration switched to 64bit, both
  are only accessible through AVOptions

2015-09-15 - lavf 57.1.100 - avformat.h
  bit_rate was changed to 64bit, make sure you update any
  printf() or other type sensitive code

2015-09-15 - lavc 57.2.100 - avcodec.h
  bit_rate/rc_max_rate/rc_min_rate were changed to 64bit, make sure you update
  any printf() or other type sensitive code

2015-09-07 - lavu 55.0.100 / lavu 55.0.0
  c734b34 / b8b5d82 - Change type of AVPixFmtDescriptor.flags from uint8_t to uint64_t.
  f53569a / 6b3ef7f - Change type of AVComponentDescriptor fields from uint16_t to int
            and drop bit packing.
  151aa2e / 2268db2 - Add step, offset, and depth to AVComponentDescriptor to replace
            the deprecated step_minus1, offset_plus1, and depth_minus1.

-------- 8< --------- FFmpeg 2.8 was cut here -------- 8< ---------

2015-08-27 - 1dd854e1 - lavc 56.58.100 - vaapi.h
  Deprecate old VA-API context (vaapi_context) fields that were only
  set and used by libavcodec. They are all managed internally now.

2015-08-19 - 9f8e57ef - lavu 54.31.100 - pixfmt.h
  Add a unique pixel format for VA-API (AV_PIX_FMT_VAAPI) that
  indicates the nature of the underlying storage: a VA surface. This
  yields the same value as AV_PIX_FMT_VAAPI_VLD.
  Deprecate old VA-API related pixel formats: AV_PIX_FMT_VAAPI_MOCO,
  AV_PIX_FMT_VAAPI_IDCT, AV_PIX_FMT_VAAPI_VLD.

2015-08-02 - lavu 54.30.100 / 54.17.0
  9ed59f1 / 7a7df34c -  Add av_blowfish_alloc().
  a130ec9 / ae365453 -  Add av_rc4_alloc().
  9ca1997 / 5d8bea3b -  Add av_xtea_alloc().
  3cf08e9 / d9e8b47e -  Add av_des_alloc().

2015-07-27 - lavc 56.56.100 / 56.35.0 - avcodec.h
  94d68a4 / 7c6eb0a1 - Rename CODEC_FLAG* defines to AV_CODEC_FLAG*.
  444e987 / def97856 - Rename CODEC_CAP_* defines to AV_CODEC_CAP_*.
  29d147c / 059a9348 - Rename FF_INPUT_BUFFER_PADDING_SIZE and FF_MIN_BUFFER_SIZE
              to AV_INPUT_BUFFER_PADDING_SIZE and AV_INPUT_BUFFER_MIN_SIZE.

2015-07-22 - c40ecff - lavc 56.51.100 - avcodec.h
  Add AV_PKT_DATA_QUALITY_STATS to export the quality value, PSNR, and pict_type
  of an AVPacket.

2015-07-16 - 8dad213 - lavc 56.49.100
  Add av_codec_get_codec_properties(), FF_CODEC_PROPERTY_LOSSLESS
  and FF_CODEC_PROPERTY_CLOSED_CAPTIONS

2015-07-03 - d563e13 / 83212943 - lavu 54.28.100 / 56.15.0
  Add av_version_info().

-------- 8< --------- FFmpeg 2.7 was cut here -------- 8< ---------

2015-06-04 - cc17b43 - lswr  1.2.100
  Add swr_get_out_samples()

2015-05-27 - c312bfa - lavu 54.26.100 - cpu.h
  Add AV_CPU_FLAG_AVXSLOW.

2015-05-26 - 1fb9b2a - lavu 54.25.100 - rational.h
  Add av_q2intfloat().

2015-05-13 - cc48409 / e7c5e17 - lavc 56.39.100 / 56.23.0
  Add av_vda_default_init2.

2015-05-11 - 541d75f - lavf 56.33.100 - avformat.h
  Add AVOpenCallback AVFormatContext.open_cb

2015-05-07 - a7dd933 - 56.38.100 - avcodec.h
  Add av_packet_side_data_name().

2015-05-07 - 01e59d4 - 56.37.102 - avcodec.h
  Add FF_PROFILE_VP9_2 and FF_PROFILE_VP9_3.

2015-05-04 - 079b7f6 - 56.37.100 - avcodec.h
  Add FF_PROFILE_VP9_0 and FF_PROFILE_VP9_1.

2015-04-22 - 748d481 - lavf 56.31.100 - avformat.h
  Add AVFMT_FLAG_FAST_SEEK flag. Some formats (initially mp3) use it to enable
  fast, but inaccurate seeking.

2015-04-20 - 8e8219e / c253340 - lavu 54.23.100 / 54.12.0 - log.h
  Add AV_LOG_TRACE for extremely verbose debugging.

2015-04-02 - 26e0e393 - lavf 56.29.100 - avio.h
  Add AVIODirEntryType.AVIO_ENTRY_SERVER.
  Add AVIODirEntryType.AVIO_ENTRY_SHARE.
  Add AVIODirEntryType.AVIO_ENTRY_WORKGROUP.

2015-03-31 - 3188696 - lavu 54.22.100 - avstring.h
  Add av_append_path_component()

2015-03-27 - 184084c - lavf 56.27.100 - avio.h url.h
  New directory listing API.

  Add AVIODirEntryType enum.
  Add AVIODirEntry, AVIODirContext structures.
  Add avio_open_dir(), avio_read_dir(), avio_close_dir(), avio_free_directory_entry().
  Add ff_alloc_dir_entry().