Never assume the API of libav* to be stable unless at least 1 month has passedsince the last major version increase or the API was added. The last version increases were:libavcodec: 2017-10-21libavdevice: 2017-10-21libavfilter: 2017-10-21libavformat: 2017-10-21libavresample: 2017-10-21libpostproc: 2017-10-21libswresample: 2017-10-21libswscale: 2017-10-21libavutil: 2017-10-21 API changes, most recent first: -------- 8< --------- FFmpeg 4.0 was cut here -------- 8< --------- 2018-04-03 - d6fc031caf - lavu 56.13.100 - pixdesc.h Deprecate AV_PIX_FMT_FLAG_PSEUDOPAL and make allocating a pseudo palette optional for API users (see AV_PIX_FMT_FLAG_PSEUDOPAL doxygen for details). 2018-04-01 - 860086ee16 - lavc 58.17.100 - avcodec.h Add av_packet_make_refcounted(). 2018-04-01 - f1805d160d - lavfi 7.14.100 - avfilter.h Deprecate use of avfilter_register(), avfilter_register_all(), avfilter_next(). Add av_filter_iterate(). 2018-03-25 - b7d0d912ef - lavc 58.16.100 - avcodec.h Add FF_SUB_CHARENC_MODE_IGNORE. 2018-03-23 - db2a7c947e - lavu 56.12.100 - encryption_info.h Add AVEncryptionInitInfo and AVEncryptionInfo structures to hold new side-data for encryption info. 2018-03-21 - f14ca60001 - lavc 58.15.100 - avcodec.h Add av_packet_make_writable(). 2018-03-18 - 4b86ac27a0 - lavu 56.11.100 - frame.h Add AV_FRAME_DATA_QP_TABLE_PROPERTIES and AV_FRAME_DATA_QP_TABLE_DATA. 2018-03-15 - e0e72539cf - lavu 56.10.100 - opt.h Add AV_OPT_FLAG_BSF_PARAM 2018-03-07 - 950170bd3b - lavu 56.9.100 - crc.h Add AV_CRC_8_EBU crc variant. 2018-03-07 - 2a0eb86857 - lavc 58.14.100 - mediacodec.h Change the default behavior of avcodec_flush() on mediacodec video decoders. To restore the previous behavior, use the new delay_flush=1 option. 2018-03-01 - 6731f60598 - lavu 56.8.100 - frame.h Add av_frame_new_side_data_from_buf(). 2018-02-15 - 8a8d0b319a Change av_ripemd_update(), av_murmur3_update() and av_hash_update() length parameter type to size_t at next major bump. 2018-02-12 - bcab11a1a2 - lavfi 7.12.100 - avfilter.h Add AVFilterContext.extra_hw_frames. 2018-02-12 - d23fff0d8a - lavc 58.11.100 - avcodec.h Add AVCodecContext.extra_hw_frames. 2018-02-06 - 0694d87024 - lavf 58.9.100 - avformat.h Deprecate use of av_register_input_format(), av_register_output_format(), av_register_all(), av_iformat_next(), av_oformat_next(). Add av_demuxer_iterate(), and av_muxer_iterate(). 2018-02-06 - 36c85d6e77 - lavc 58.10.100 - avcodec.h Deprecate use of avcodec_register(), avcodec_register_all(), av_codec_next(), av_register_codec_parser(), and av_parser_next(). Add av_codec_iterate() and av_parser_iterate(). 2018-02-04 - ff46124b0d - lavf 58.8.100 - avformat.h Deprecate the current names of the RTSP "timeout", "stimeout", "user-agent" options. Introduce "listen_timeout" as replacement for the current "timeout" option, and "user_agent" as replacement for "user-agent". Once the deprecation is over, the old "timeout" option will be removed, and "stimeout" will be renamed to "stimeout" (the "timeout" option will essentially change semantics). 2018-01-28 - ea3672b7d6 - lavf 58.7.100 - avformat.h Deprecate AVFormatContext filename field which had limited length, use the new dynamically allocated url field instead. 2018-01-28 - ea3672b7d6 - lavf 58.7.100 - avformat.h Add url field to AVFormatContext and add ff_format_set_url helper function. 2018-01-27 - 6194d7e564 - lavf 58.6.100 - avformat.h Add AVFMTCTX_UNSEEKABLE (for HLS demuxer). 2018-01-23 - 9f07cf7c00 - lavu 56.9.100 - aes_ctr.h Add method to set the 16-byte IV. 2018-01-16 - 631c56a8e4 - lavf 58.5.100 - avformat.h Explicitly make avformat_network_init() and avformat_network_deinit() optional. If these are not called, network initialization and deinitialization is automatic, and unlike in older versions, fully supported, unless libavformat is linked to ancient GnuTLS and OpenSSL. 2018-01-16 - 6512ff72f9 - lavf 58.4.100 - avformat.h Deprecate AVStream.recommended_encoder_configuration. It was useful only for FFserver, which has been removed. 2018-01-05 - 798dcf2432 - lavfi 7.11.101 - avfilter.h Deprecate avfilter_link_get_channels(). Use av_buffersink_get_channels(). 2017-01-04 - c29038f304 - lavr 4.0.0 - avresample.h Deprecate the entire library. Merged years ago to provide compatibility with Libav, it remained unmaintained by the FFmpeg project and duplicated functionality provided by libswresample. In order to improve consistency and reduce attack surface, it has been deprecated. Users of this library are asked to migrate to libswresample, which, as well as providing more functionality, is faster and has higher accuracy. 2017-12-26 - a04c2c707d - lavc 58.9.100 - avcodec.h Deprecate av_lockmgr_register(). You need to build FFmpeg with threading support enabled to get basic thread-safety (which is the default build configuration). 2017-12-24 - 8b81eabe57 - lavu 56.7.100 - cpu.h AVX-512 flags added. 2017-12-16 - 8bf4e6d3ce - lavc 58.8.100 - avcodec.h The MediaCodec decoders now support AVCodecContext.hw_device_ctx. 2017-12-16 - e4d9f05ca7 - lavu 56.6.100 - hwcontext.h hwcontext_mediacodec.h Add AV_HWDEVICE_TYPE_MEDIACODEC and a new installed header with MediaCodec-specific hwcontext definitions. 2017-12-14 - b945fed629 - lavc 58.7.100 - avcodec.h Add AV_CODEC_CAP_HARDWARE, AV_CODEC_CAP_HYBRID, and AVCodec.wrapper_name, and mark all AVCodecs accordingly. 2017-11-29 - d268094f88 - lavu 56.4.100 / 56.7.0 - stereo3d.h Add view field to AVStereo3D structure and AVStereo3DView enum. 2017-11-26 - 3a71bcc213 - lavc 58.6.100 - avcodec.h Add const to AVCodecContext.hwaccel. 2017-11-26 - 3536a3efb9 - lavc 58.5.100 - avcodec.h Deprecate user visibility of the AVHWAccel structure and the functions av_register_hwaccel() and av_hwaccel_next(). 2017-11-26 - 24cc0a53e9 - lavc 58.4.100 - avcodec.h Add AVCodecHWConfig and avcodec_get_hw_config(). 2017-11-22 - 3650cb2dfa - lavu 56.3.100 - opencl.h Remove experimental OpenCL API (av_opencl_*). 2017-11-22 - b25d8ef0a7 - lavu 56.2.100 - hwcontext.h hwcontext_opencl.h Add AV_HWDEVICE_TYPE_OPENCL and a new installed header with OpenCL-specific hwcontext definitions. 2017-11-22 - a050f56c09 - lavu 56.1.100 - pixfmt.h Add AV_PIX_FMT_OPENCL. 2017-11-11 - 48e4eda11d - lavc 58.3.100 - avcodec.h Add avcodec_get_hw_frames_parameters(). -------- 8< --------- FFmpeg 3.4 was cut here -------- 8< --------- 2017-09-28 - b6cf66ae1c - lavc 57.106.104 - avcodec.h Add AV_PKT_DATA_A53_CC packet side data, to export closed captions 2017-09-27 - 7aa6b8a68f - lavu 55.77.101 / lavu 55.31.1 - frame.h Allow passing the value of 0 (meaning "automatic") as the required alignment to av_frame_get_buffer(). 2017-09-27 - 522f877086 - lavu 55.77.100 / lavu 55.31.0 - cpu.h Add av_cpu_max_align() for querying maximum required data alignment. 2017-09-26 - b1cf151c4d - lavc 57.106.102 - avcodec.h Deprecate AVCodecContext.refcounted_frames. This was useful for deprecated API only (avcodec_decode_video2/avcodec_decode_audio4). The new decode APIs (avcodec_send_packet/avcodec_receive_frame) always work with reference counted frames. 2017-09-21 - 6f15f1cdc8 - lavu 55.76.100 / 56.6.0 - pixdesc.h Add av_color_range_from_name(), av_color_primaries_from_name(), av_color_transfer_from_name(), av_color_space_from_name(), and av_chroma_location_from_name(). 2017-09-13 - 82342cead1 - lavc 57.106.100 - avcodec.h Add AV_PKT_FLAG_TRUSTED. 2017-09-13 - 9cb23cd9fe - lavu 55.75.100 - hwcontext.h hwcontext_drm.h Add AV_HWDEVICE_TYPE_DRM and implementation. 2017-09-08 - 5ba2aef6ec - lavfi 6.103.100 - buffersrc.h Add av_buffersrc_close(). 2017-09-04 - 6cadbb16e9 - lavc 57.105.100 - avcodec.h Add AV_HWACCEL_CODEC_CAP_EXPERIMENTAL, replacing the deprecated HWACCEL_CODEC_CAP_EXPERIMENTAL flag. 2017-09-01 - 5d76674756 - lavf 57.81.100 - avio.h Add avio_read_partial(). 2017-09-01 - xxxxxxx - lavf 57.80.100 / 57.11.0 - avio.h Add avio_context_free(). From now on it must be used for freeing AVIOContext. 2017-08-08 - 1460408703 - lavu 55.74.100 - pixdesc.h Add AV_PIX_FMT_FLAG_FLOAT pixel format flag. 2017-08-08 - 463b81de2b - lavu 55.72.100 - imgutils.h Add av_image_fill_black(). 2017-08-08 - caa12027ba - lavu 55.71.100 - frame.h Add av_frame_apply_cropping(). 2017-07-25 - 24de4fddca - lavu 55.69.100 - frame.h Add AV_FRAME_DATA_ICC_PROFILE side data type. 2017-06-27 - 70143a3954 - lavc 57.100.100 - avcodec.h DXVA2 and D3D11 hardware accelerated decoding now supports the new hwaccel API, which can create the decoder context and allocate hardware frame automatically. See AVCodecContext.hw_device_ctx and AVCodecContext.hw_frames_ctx. For D3D11, the new AV_PIX_FMT_D3D11 pixfmt must be used with the new API. 2017-06-27 - 3303511f33 - lavu 56.67.100 - hwcontext.h Add AV_HWDEVICE_TYPE_D3D11VA and AV_PIX_FMT_D3D11. 2017-06-24 - 09891c5391 - lavf 57.75.100 - avio.h Add AVIO_DATA_MARKER_FLUSH_POINT to signal preferred flush points to aviobuf. 2017-06-14 - d59c6a3aeb - lavu 55.66.100 - hwcontext.h av_hwframe_ctx_create_derived() now takes some AV_HWFRAME_MAP_* combination as its flags argument (which was previously unused). 2017-06-14 - 49ae8a5e87 - lavc 57.99.100 - avcodec.h Add AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH. 2017-06-14 - 0b1794a43e - lavu 55.65.100 - hwcontext.h Add AV_HWDEVICE_TYPE_NONE, av_hwdevice_find_type_by_name(), av_hwdevice_get_type_name() and av_hwdevice_iterate_types(). 2017-06-14 - b22172f6f3 - lavu 55.64.100 - hwcontext.h Add av_hwdevice_ctx_create_derived(). 2017-05-15 - 532b23f079 - lavc 57.96.100 - avcodec.h VideoToolbox hardware-accelerated decoding now supports the new hwaccel API, which can create the decoder context and allocate hardware frames automatically. See AVCodecContext.hw_device_ctx and AVCodecContext.hw_frames_ctx. 2017-05-15 - 532b23f079 - lavu 57.63.100 - hwcontext.h Add AV_HWDEVICE_TYPE_VIDEOTOOLBOX and implementation. 2017-05-08 - f089e02fa2 - lavc 57.95.100 / 57.31.0 - avcodec.h Add AVCodecContext.apply_cropping to control whether cropping is handled by libavcodec or the caller. 2017-05-08 - a47bd5d77e - lavu 55.62.100 / 55.30.0 - frame.h Add AVFrame.crop_left/right/top/bottom fields for attaching cropping information to video frames. 2017-xx-xx - xxxxxxxxxx Change av_sha_update(), av_sha512_update() and av_md5_sum()/av_md5_update() length parameter type to size_t at next major bump. 2017-05-05 - c0f17a905f - lavc 57.94.100 - avcodec.h The cuvid decoders now support AVCodecContext.hw_device_ctx, which removes the requirement to set an incomplete AVCodecContext.hw_frames_ctx only to set the Cuda device handle. 2017-04-11 - 8378466507 - lavu 55.61.100 - avstring.h Add av_strireplace(). 2016-04-06 - 157e57a181 - lavc 57.92.100 - avcodec.h Add AV_PKT_DATA_CONTENT_LIGHT_LEVEL packet side data. 2016-04-06 - b378f5bd64 - lavu 55.60.100 - mastering_display_metadata.h Add AV_FRAME_DATA_CONTENT_LIGHT_LEVEL value, av_content_light_metadata_alloc() and av_content_light_metadata_create_side_data() API, and AVContentLightMetadata type to export content light level video properties. 2017-03-31 - 9033e8723c - lavu 55.57.100 - spherical.h Add av_spherical_projection_name(). Add av_spherical_from_name(). 2017-03-30 - 4cda23f1f1 - lavu 55.53.100 / 55.27.0 - hwcontext.h Add av_hwframe_map() and associated AV_HWFRAME_MAP_* flags. Add av_hwframe_ctx_create_derived(). 2017-03-29 - bfdcdd6d82 - lavu 55.52.100 - avutil.h add av_fourcc_make_string() function and av_fourcc2str() macro to replace av_get_codec_tag_string() from lavc. 2017-03-27 - ddef3d902f - lavf 57.68.100 - avformat.h Deprecate that demuxers export the stream rotation angle in AVStream.metadata (via an entry named "rotate"). Use av_stream_get_side_data() with AV_PKT_DATA_DISPLAYMATRIX instead, and read the rotation angle with av_display_rotation_get(). The same is done for muxing. Instead of adding a "rotate" entry to AVStream.metadata, AV_PKT_DATA_DISPLAYMATRIX side data has to be added to the AVStream. 2017-03-23 - 7e4ba776a2 - lavc 57.85.101 - avcodec.h vdpau hardware accelerated decoding now supports the new hwaccel API, which can create the decoder context and allocate hardware frame automatically. See AVCodecContext.hw_device_ctx and AVCodecContext.hw_frames_ctx. 2017-03-23 - 156bd8278f - lavc 57.85.100 - avcodec.h Add AVCodecContext.hwaccel_flags field. This will control some hwaccels at a later point. 2017-03-21 - fc9f14c7de - lavf 57.67.100 / 57.08.0 - avio.h Add AVIO_SEEKABLE_TIME flag. 2017-03-21 - d682ae70b4 - lavf 57.66.105, lavc 57.83.101 - avformat.h, avcodec.h Deprecate AVFMT_FLAG_KEEP_SIDE_DATA. It will be ignored after the next major bump, and libavformat will behave as if it were always set. Deprecate av_packet_merge_side_data() and av_packet_split_side_data(). 2016-03-20 - 8200b16a9c - lavu 55.50.100 / 55.21.0 - imgutils.h Add av_image_copy_uc_from(), a version of av_image_copy() for copying from GPU mapped memory. 2017-03-20 - 9c2436e - lavu 55.49.100 - pixdesc.h Add AV_PIX_FMT_FLAG_BAYER pixel format flag. 2017-03-18 - 3796fb2692 - lavfi 6.77.100 - avfilter.h Deprecate AVFilterGraph.resample_lavr_opts It's never been used by avfilter nor passed to anything. 2017-02-10 - 1b7ffddb3a - lavu 55.48.100 / 55.33.0 - spherical.h Add AV_SPHERICAL_EQUIRECTANGULAR_TILE, av_spherical_tile_bounds(), and projection-specific properties (bound_left, bound_top, bound_right, bound_bottom, padding) to AVSphericalMapping. 2017-03-02 - ade7c1a232 - lavc 57.81.104 - videotoolbox.h AVVideotoolboxContext.cv_pix_fmt_type can now be set to 0 to output the native decoder format. (The default value is not changed.) 2017-03-02 - 554bc4eea8 - lavu 55.47.101, lavc 57.81.102, lavf 57.66.103 Remove requirement to use AVOption or accessors to access certain fields in AVFrame, AVCodecContext, and AVFormatContext that were previously documented as "no direct access" allowed. 2017-02-13 - c1a5fca06f - lavc 57.80.100 - avcodec.h Add AVCodecContext.hw_device_ctx. 2017-02-11 - e3af49b14b - lavu 55.47.100 - frame.h Add AVFrame.opaque_ref. 2017-01-31 - 2eab48177d - lavu 55.46.100 / 55.20.0 - cpu.h Add AV_CPU_FLAG_SSSE3SLOW. 2017-01-24 - c4618f842a - lavu 55.45.100 - channel_layout.h Add av_get_extended_channel_layout() 2017-01-22 - 76c5a69e26 - lavu 55.44.100 - lfg.h Add av_lfg_init_from_data(). 2017-01-17 - 2a4a8653b6 - lavc 57.74.100 - vaapi.h Deprecate struct vaapi_context and the vaapi.h installed header. Callers should set AVCodecContext.hw_frames_ctx instead. 2017-01-12 - dbe9dbed31 - lavfi 6.69.100 - buffersink.h Add av_buffersink_get_*() functions. 2017-01-06 - 9488032e10 - lavf 57.62.100 - avio.h Add avio_get_dyn_buf() 2016-12-10 - f542b152aa - lavu 55.43.100 - imgutils.h Add av_image_check_size2() 2016-12-07 - e7a6f8c972 - lavc 57.67.100 / 57.29.0 - avcodec.h Add AV_PKT_DATA_SPHERICAL packet side data to export AVSphericalMapping information from containers. 2016-12-07 - 8f58ecc344 - lavu 55.42.100 / 55.30.0 - spherical.h Add AV_FRAME_DATA_SPHERICAL value, av_spherical_alloc() API and AVSphericalMapping type to export and describe spherical video properties. 2016-11-18 - 2ab50647ff - lavf 57.58.100 - avformat.h Add av_stream_add_side_data(). 2016-11-13 - 775a8477b7 - lavu 55.39.100 - hwcontext_vaapi.h Add AV_VAAPI_DRIVER_QUIRK_ATTRIB_MEMTYPE. 2016-11-13 - a8d51bb424 - lavu 55.38.100 - hwcontext_vaapi.h Add driver quirks field to VAAPI-specific hwdevice and enum with members AV_VAAPI_DRIVER_QUIRK_* to represent its values. 2016-11-10 - 638b216d4f - lavu 55.36.100 - pixfmt.h Add AV_PIX_FMT_GRAY12(LE/BE). -------- 8< --------- FFmpeg 3.2 was cut here -------- 8< --------- 2016-10-24 - 73ead47 - lavf 57.55.100 - avformat.h Add AV_DISPOSITION_TIMED_THUMBNAILS 2016-10-24 - a246fef - lavf 57.54.100 - avformat.h Add avformat_init_output() and AVSTREAM_INIT_IN_ macros 2016-10-22 - f5495c9 - lavu 55.33.100 - avassert.h Add av_assert0_fpu() / av_assert2_fpu() 2016-10-07 - 3f9137c / 32c8359 - lavc 57.61.100 / 57.24.0 - avcodec.h Decoders now export the frame timestamp as AVFrame.pts. It was previously exported as AVFrame.pkt_pts, which is now deprecated. Note: When decoding, AVFrame.pts uses the stream/packet timebase, and not the codec timebase. 2016-09-28 - eba0414 - lavu 55.32.100 / 55.16.0 - hwcontext.h hwcontext_qsv.h Add AV_HWDEVICE_TYPE_QSV and a new installed header with QSV-specific hwcontext definitions. 2016-09-26 - 32c25f0 - lavc 57.59.100 / 57.23.0 - avcodec.h AVCodecContext.hw_frames_ctx now may be used by decoders. 2016-09-27 - f0b6f72 - lavf 57.51.100 - avformat.h Add av_stream_get_codec_timebase() 2016-09-27 - 23c0779 - lswr 2.2.100 - swresample.h Add swr_build_matrix(). 2016-09-23 - 30d3e36 - lavc 57.58.100 - avcodec.h Add AV_CODEC_CAP_AVOID_PROBING codec capability flag. 2016-09-14 - ae1dd0c - lavf 57.49.100 - avformat.h Add avformat_transfer_internal_stream_timing_info helper to help with stream copy. 2016-08-29 - 4493390 - lavfi 6.58.100 - avfilter.h Add AVFilterContext.nb_threads. 2016-08-15 - c3c4c72 - lavc 57.53.100 - avcodec.h Add trailing_padding to AVCodecContext to match the corresponding field in AVCodecParameters. 2016-08-15 - b746ed7 - lavc 57.52.100 - avcodec.h Add a new API for chained BSF filters and passthrough (null) BSF -- av_bsf_list_alloc(), av_bsf_list_free(), av_bsf_list_append(), av_bsf_list_append2(), av_bsf_list_finalize(), av_bsf_list_parse_str() and av_bsf_get_null_filter(). 2016-08-04 - 82a33c8 - lavf 57.46.100 - avformat.h Add av_get_frame_filename2() 2016-07-09 - 775389f / 90f469a - lavc 57.50.100 / 57.20.0 - avcodec.h Add FF_PROFILE_H264_MULTIVIEW_HIGH and FF_PROFILE_H264_STEREO_HIGH. 2016-06-30 - c1c7e0ab - lavf 57.41.100 - avformat.h Moved codecpar field from AVStream to the end of the struct, so that the following private fields are in the same location as in FFmpeg 3.0 (lavf 57.25.100). 2016-06-30 - 042fb69d - lavu 55.28.100 - frame.h Moved hw_frames_ctx field from AVFrame to the end of the struct, so that the following private fields are in the same location as in FFmpeg 3.0 (lavu 55.17.103). 2016-06-29 - 1a751455 - lavfi 6.47.100 - avfilter.h Fix accidental ABI breakage in AVFilterContext. ABI was broken in 8688d3a, lavfi 6.42.100 and released as ffmpeg 3.1. Because of this, ffmpeg and ffplay built against lavfi>=6.42.100 will not be compatible with lavfi>=6.47.100. Potentially also affects other users of libavfilter if they are using one of the affected fields. -------- 8< --------- FFmpeg 3.1 was cut here -------- 8< --------- 2016-06-26 - 481f320 / 1c9e861 - lavu 55.27.100 / 55.13.0 - hwcontext.h Add av_hwdevice_ctx_create(). 2016-06-26 - b95534b / e47b8bb - lavc 57.48.101 / 57.19.1 - avcodec.h Adjust values for JPEG 2000 profiles. 2016-06-23 - 5d75e46 / db7968b - lavf 57.40.100 / 57.7.0 - avio.h Add AVIODataMarkerType, write_data_type, ignore_boundary_point and avio_write_marker. 2016-06-23 - abb3cc4 / 0c4468d - lavu 55.26.100 / 55.12.0 - opt.h Add av_stereo3d_type_name() and av_stereo3d_from_name(). 2016-06-22 - 3689efe / c46db38 - lavu 55.25.100 / 55.11.0 - hwcontext_dxva2.h Add new installed header with DXVA2-specific hwcontext definitions. 2016-04-27 - fb91871 - lavu 55.23.100 - log.h Add a new function av_log_format_line2() which returns number of bytes written to the target buffer. 2016-04-21 - 7fc329e - lavc 57.37.100 - avcodec.h Add a new audio/video encoding and decoding API with decoupled input and output -- avcodec_send_packet(), avcodec_receive_frame(), avcodec_send_frame() and avcodec_receive_packet(). 2016-04-17 - af9cac1 / 33d1898 - lavc 57.35.100 / 57.15.0 - avcodec.h Add a new bitstream filtering API working with AVPackets. Deprecate the old bitstream filtering API. 2016-04-14 - 8688d3a / 07a844f - lavfi 6.42.100 / 6.3.0 - avfilter.h Add AVFilterContext.hw_device_ctx. 2016-04-14 - 28abb21 / 551c677 - lavu 55.22.100 / 55.9.0 - hwcontext_vaapi.h Add new installed header with VAAPI-specific hwcontext definitions.Lines 1–500 of 3064. Load more
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: 2017-10-21 libavdevice: 2017-10-21 libavfilter: 2017-10-21 libavformat: 2017-10-21 libavresample: 2017-10-21 libpostproc: 2017-10-21 libswresample: 2017-10-21 libswscale: 2017-10-21 libavutil: 2017-10-21 API changes, most recent first: -------- 8< --------- FFmpeg 4.0 was cut here -------- 8< --------- 2018-04-03 - d6fc031caf - lavu 56.13.100 - pixdesc.h Deprecate AV_PIX_FMT_FLAG_PSEUDOPAL and make allocating a pseudo palette optional for API users (see AV_PIX_FMT_FLAG_PSEUDOPAL doxygen for details). 2018-04-01 - 860086ee16 - lavc 58.17.100 - avcodec.h Add av_packet_make_refcounted(). 2018-04-01 - f1805d160d - lavfi 7.14.100 - avfilter.h Deprecate use of avfilter_register(), avfilter_register_all(), avfilter_next(). Add av_filter_iterate(). 2018-03-25 - b7d0d912ef - lavc 58.16.100 - avcodec.h Add FF_SUB_CHARENC_MODE_IGNORE. 2018-03-23 - db2a7c947e - lavu 56.12.100 - encryption_info.h Add AVEncryptionInitInfo and AVEncryptionInfo structures to hold new side-data for encryption info. 2018-03-21 - f14ca60001 - lavc 58.15.100 - avcodec.h Add av_packet_make_writable(). 2018-03-18 - 4b86ac27a0 - lavu 56.11.100 - frame.h Add AV_FRAME_DATA_QP_TABLE_PROPERTIES and AV_FRAME_DATA_QP_TABLE_DATA. 2018-03-15 - e0e72539cf - lavu 56.10.100 - opt.h Add AV_OPT_FLAG_BSF_PARAM 2018-03-07 - 950170bd3b - lavu 56.9.100 - crc.h Add AV_CRC_8_EBU crc variant. 2018-03-07 - 2a0eb86857 - lavc 58.14.100 - mediacodec.h Change the default behavior of avcodec_flush() on mediacodec video decoders. To restore the previous behavior, use the new delay_flush=1 option. 2018-03-01 - 6731f60598 - lavu 56.8.100 - frame.h Add av_frame_new_side_data_from_buf(). 2018-02-15 - 8a8d0b319a Change av_ripemd_update(), av_murmur3_update() and av_hash_update() length parameter type to size_t at next major bump. 2018-02-12 - bcab11a1a2 - lavfi 7.12.100 - avfilter.h Add AVFilterContext.extra_hw_frames. 2018-02-12 - d23fff0d8a - lavc 58.11.100 - avcodec.h Add AVCodecContext.extra_hw_frames. 2018-02-06 - 0694d87024 - lavf 58.9.100 - avformat.h Deprecate use of av_register_input_format(), av_register_output_format(), av_register_all(), av_iformat_next(), av_oformat_next(). Add av_demuxer_iterate(), and av_muxer_iterate(). 2018-02-06 - 36c85d6e77 - lavc 58.10.100 - avcodec.h Deprecate use of avcodec_register(), avcodec_register_all(), av_codec_next(), av_register_codec_parser(), and av_parser_next(). Add av_codec_iterate() and av_parser_iterate(). 2018-02-04 - ff46124b0d - lavf 58.8.100 - avformat.h Deprecate the current names of the RTSP "timeout", "stimeout", "user-agent" options. Introduce "listen_timeout" as replacement for the current "timeout" option, and "user_agent" as replacement for "user-agent". Once the deprecation is over, the old "timeout" option will be removed, and "stimeout" will be renamed to "stimeout" (the "timeout" option will essentially change semantics). 2018-01-28 - ea3672b7d6 - lavf 58.7.100 - avformat.h Deprecate AVFormatContext filename field which had limited length, use the new dynamically allocated url field instead. 2018-01-28 - ea3672b7d6 - lavf 58.7.100 - avformat.h Add url field to AVFormatContext and add ff_format_set_url helper function. 2018-01-27 - 6194d7e564 - lavf 58.6.100 - avformat.h Add AVFMTCTX_UNSEEKABLE (for HLS demuxer). 2018-01-23 - 9f07cf7c00 - lavu 56.9.100 - aes_ctr.h Add method to set the 16-byte IV. 2018-01-16 - 631c56a8e4 - lavf 58.5.100 - avformat.h Explicitly make avformat_network_init() and avformat_network_deinit() optional. If these are not called, network initialization and deinitialization is automatic, and unlike in older versions, fully supported, unless libavformat is linked to ancient GnuTLS and OpenSSL. 2018-01-16 - 6512ff72f9 - lavf 58.4.100 - avformat.h Deprecate AVStream.recommended_encoder_configuration. It was useful only for FFserver, which has been removed. 2018-01-05 - 798dcf2432 - lavfi 7.11.101 - avfilter.h Deprecate avfilter_link_get_channels(). Use av_buffersink_get_channels(). 2017-01-04 - c29038f304 - lavr 4.0.0 - avresample.h Deprecate the entire library. Merged years ago to provide compatibility with Libav, it remained unmaintained by the FFmpeg project and duplicated functionality provided by libswresample. In order to improve consistency and reduce attack surface, it has been deprecated. Users of this library are asked to migrate to libswresample, which, as well as providing more functionality, is faster and has higher accuracy. 2017-12-26 - a04c2c707d - lavc 58.9.100 - avcodec.h Deprecate av_lockmgr_register(). You need to build FFmpeg with threading support enabled to get basic thread-safety (which is the default build configuration). 2017-12-24 - 8b81eabe57 - lavu 56.7.100 - cpu.h AVX-512 flags added. 2017-12-16 - 8bf4e6d3ce - lavc 58.8.100 - avcodec.h The MediaCodec decoders now support AVCodecContext.hw_device_ctx. 2017-12-16 - e4d9f05ca7 - lavu 56.6.100 - hwcontext.h hwcontext_mediacodec.h Add AV_HWDEVICE_TYPE_MEDIACODEC and a new installed header with MediaCodec-specific hwcontext definitions. 2017-12-14 - b945fed629 - lavc 58.7.100 - avcodec.h Add AV_CODEC_CAP_HARDWARE, AV_CODEC_CAP_HYBRID, and AVCodec.wrapper_name, and mark all AVCodecs accordingly. 2017-11-29 - d268094f88 - lavu 56.4.100 / 56.7.0 - stereo3d.h Add view field to AVStereo3D structure and AVStereo3DView enum. 2017-11-26 - 3a71bcc213 - lavc 58.6.100 - avcodec.h Add const to AVCodecContext.hwaccel. 2017-11-26 - 3536a3efb9 - lavc 58.5.100 - avcodec.h Deprecate user visibility of the AVHWAccel structure and the functions av_register_hwaccel() and av_hwaccel_next(). 2017-11-26 - 24cc0a53e9 - lavc 58.4.100 - avcodec.h Add AVCodecHWConfig and avcodec_get_hw_config(). 2017-11-22 - 3650cb2dfa - lavu 56.3.100 - opencl.h Remove experimental OpenCL API (av_opencl_*). 2017-11-22 - b25d8ef0a7 - lavu 56.2.100 - hwcontext.h hwcontext_opencl.h Add AV_HWDEVICE_TYPE_OPENCL and a new installed header with OpenCL-specific hwcontext definitions. 2017-11-22 - a050f56c09 - lavu 56.1.100 - pixfmt.h Add AV_PIX_FMT_OPENCL. 2017-11-11 - 48e4eda11d - lavc 58.3.100 - avcodec.h Add avcodec_get_hw_frames_parameters(). -------- 8< --------- FFmpeg 3.4 was cut here -------- 8< --------- 2017-09-28 - b6cf66ae1c - lavc 57.106.104 - avcodec.h Add AV_PKT_DATA_A53_CC packet side data, to export closed captions 2017-09-27 - 7aa6b8a68f - lavu 55.77.101 / lavu 55.31.1 - frame.h Allow passing the value of 0 (meaning "automatic") as the required alignment to av_frame_get_buffer(). 2017-09-27 - 522f877086 - lavu 55.77.100 / lavu 55.31.0 - cpu.h Add av_cpu_max_align() for querying maximum required data alignment. 2017-09-26 - b1cf151c4d - lavc 57.106.102 - avcodec.h Deprecate AVCodecContext.refcounted_frames. This was useful for deprecated API only (avcodec_decode_video2/avcodec_decode_audio4). The new decode APIs (avcodec_send_packet/avcodec_receive_frame) always work with reference counted frames. 2017-09-21 - 6f15f1cdc8 - lavu 55.76.100 / 56.6.0 - pixdesc.h Add av_color_range_from_name(), av_color_primaries_from_name(), av_color_transfer_from_name(), av_color_space_from_name(), and av_chroma_location_from_name(). 2017-09-13 - 82342cead1 - lavc 57.106.100 - avcodec.h Add AV_PKT_FLAG_TRUSTED. 2017-09-13 - 9cb23cd9fe - lavu 55.75.100 - hwcontext.h hwcontext_drm.h Add AV_HWDEVICE_TYPE_DRM and implementation. 2017-09-08 - 5ba2aef6ec - lavfi 6.103.100 - buffersrc.h Add av_buffersrc_close(). 2017-09-04 - 6cadbb16e9 - lavc 57.105.100 - avcodec.h Add AV_HWACCEL_CODEC_CAP_EXPERIMENTAL, replacing the deprecated HWACCEL_CODEC_CAP_EXPERIMENTAL flag. 2017-09-01 - 5d76674756 - lavf 57.81.100 - avio.h Add avio_read_partial(). 2017-09-01 - xxxxxxx - lavf 57.80.100 / 57.11.0 - avio.h Add avio_context_free(). From now on it must be used for freeing AVIOContext. 2017-08-08 - 1460408703 - lavu 55.74.100 - pixdesc.h Add AV_PIX_FMT_FLAG_FLOAT pixel format flag. 2017-08-08 - 463b81de2b - lavu 55.72.100 - imgutils.h Add av_image_fill_black(). 2017-08-08 - caa12027ba - lavu 55.71.100 - frame.h Add av_frame_apply_cropping(). 2017-07-25 - 24de4fddca - lavu 55.69.100 - frame.h Add AV_FRAME_DATA_ICC_PROFILE side data type. 2017-06-27 - 70143a3954 - lavc 57.100.100 - avcodec.h DXVA2 and D3D11 hardware accelerated decoding now supports the new hwaccel API, which can create the decoder context and allocate hardware frame automatically. See AVCodecContext.hw_device_ctx and AVCodecContext.hw_frames_ctx. For D3D11, the new AV_PIX_FMT_D3D11 pixfmt must be used with the new API. 2017-06-27 - 3303511f33 - lavu 56.67.100 - hwcontext.h Add AV_HWDEVICE_TYPE_D3D11VA and AV_PIX_FMT_D3D11. 2017-06-24 - 09891c5391 - lavf 57.75.100 - avio.h Add AVIO_DATA_MARKER_FLUSH_POINT to signal preferred flush points to aviobuf. 2017-06-14 - d59c6a3aeb - lavu 55.66.100 - hwcontext.h av_hwframe_ctx_create_derived() now takes some AV_HWFRAME_MAP_* combination as its flags argument (which was previously unused). 2017-06-14 - 49ae8a5e87 - lavc 57.99.100 - avcodec.h Add AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH. 2017-06-14 - 0b1794a43e - lavu 55.65.100 - hwcontext.h Add AV_HWDEVICE_TYPE_NONE, av_hwdevice_find_type_by_name(), av_hwdevice_get_type_name() and av_hwdevice_iterate_types(). 2017-06-14 - b22172f6f3 - lavu 55.64.100 - hwcontext.h Add av_hwdevice_ctx_create_derived(). 2017-05-15 - 532b23f079 - lavc 57.96.100 - avcodec.h VideoToolbox hardware-accelerated decoding now supports the new hwaccel API, which can create the decoder context and allocate hardware frames automatically. See AVCodecContext.hw_device_ctx and AVCodecContext.hw_frames_ctx. 2017-05-15 - 532b23f079 - lavu 57.63.100 - hwcontext.h Add AV_HWDEVICE_TYPE_VIDEOTOOLBOX and implementation. 2017-05-08 - f089e02fa2 - lavc 57.95.100 / 57.31.0 - avcodec.h Add AVCodecContext.apply_cropping to control whether cropping is handled by libavcodec or the caller. 2017-05-08 - a47bd5d77e - lavu 55.62.100 / 55.30.0 - frame.h Add AVFrame.crop_left/right/top/bottom fields for attaching cropping information to video frames. 2017-xx-xx - xxxxxxxxxx Change av_sha_update(), av_sha512_update() and av_md5_sum()/av_md5_update() length parameter type to size_t at next major bump. 2017-05-05 - c0f17a905f - lavc 57.94.100 - avcodec.h The cuvid decoders now support AVCodecContext.hw_device_ctx, which removes the requirement to set an incomplete AVCodecContext.hw_frames_ctx only to set the Cuda device handle. 2017-04-11 - 8378466507 - lavu 55.61.100 - avstring.h Add av_strireplace(). 2016-04-06 - 157e57a181 - lavc 57.92.100 - avcodec.h Add AV_PKT_DATA_CONTENT_LIGHT_LEVEL packet side data. 2016-04-06 - b378f5bd64 - lavu 55.60.100 - mastering_display_metadata.h Add AV_FRAME_DATA_CONTENT_LIGHT_LEVEL value, av_content_light_metadata_alloc() and av_content_light_metadata_create_side_data() API, and AVContentLightMetadata type to export content light level video properties. 2017-03-31 - 9033e8723c - lavu 55.57.100 - spherical.h Add av_spherical_projection_name(). Add av_spherical_from_name(). 2017-03-30 - 4cda23f1f1 - lavu 55.53.100 / 55.27.0 - hwcontext.h Add av_hwframe_map() and associated AV_HWFRAME_MAP_* flags. Add av_hwframe_ctx_create_derived(). 2017-03-29 - bfdcdd6d82 - lavu 55.52.100 - avutil.h add av_fourcc_make_string() function and av_fourcc2str() macro to replace av_get_codec_tag_string() from lavc. 2017-03-27 - ddef3d902f - lavf 57.68.100 - avformat.h Deprecate that demuxers export the stream rotation angle in AVStream.metadata (via an entry named "rotate"). Use av_stream_get_side_data() with AV_PKT_DATA_DISPLAYMATRIX instead, and read the rotation angle with av_display_rotation_get(). The same is done for muxing. Instead of adding a "rotate" entry to AVStream.metadata, AV_PKT_DATA_DISPLAYMATRIX side data has to be added to the AVStream. 2017-03-23 - 7e4ba776a2 - lavc 57.85.101 - avcodec.h vdpau hardware accelerated decoding now supports the new hwaccel API, which can create the decoder context and allocate hardware frame automatically. See AVCodecContext.hw_device_ctx and AVCodecContext.hw_frames_ctx. 2017-03-23 - 156bd8278f - lavc 57.85.100 - avcodec.h Add AVCodecContext.hwaccel_flags field. This will control some hwaccels at a later point. 2017-03-21 - fc9f14c7de - lavf 57.67.100 / 57.08.0 - avio.h Add AVIO_SEEKABLE_TIME flag. 2017-03-21 - d682ae70b4 - lavf 57.66.105, lavc 57.83.101 - avformat.h, avcodec.h Deprecate AVFMT_FLAG_KEEP_SIDE_DATA. It will be ignored after the next major bump, and libavformat will behave as if it were always set. Deprecate av_packet_merge_side_data() and av_packet_split_side_data(). 2016-03-20 - 8200b16a9c - lavu 55.50.100 / 55.21.0 - imgutils.h Add av_image_copy_uc_from(), a version of av_image_copy() for copying from GPU mapped memory. 2017-03-20 - 9c2436e - lavu 55.49.100 - pixdesc.h Add AV_PIX_FMT_FLAG_BAYER pixel format flag. 2017-03-18 - 3796fb2692 - lavfi 6.77.100 - avfilter.h Deprecate AVFilterGraph.resample_lavr_opts It's never been used by avfilter nor passed to anything. 2017-02-10 - 1b7ffddb3a - lavu 55.48.100 / 55.33.0 - spherical.h Add AV_SPHERICAL_EQUIRECTANGULAR_TILE, av_spherical_tile_bounds(), and projection-specific properties (bound_left, bound_top, bound_right, bound_bottom, padding) to AVSphericalMapping. 2017-03-02 - ade7c1a232 - lavc 57.81.104 - videotoolbox.h AVVideotoolboxContext.cv_pix_fmt_type can now be set to 0 to output the native decoder format. (The default value is not changed.) 2017-03-02 - 554bc4eea8 - lavu 55.47.101, lavc 57.81.102, lavf 57.66.103 Remove requirement to use AVOption or accessors to access certain fields in AVFrame, AVCodecContext, and AVFormatContext that were previously documented as "no direct access" allowed. 2017-02-13 - c1a5fca06f - lavc 57.80.100 - avcodec.h Add AVCodecContext.hw_device_ctx. 2017-02-11 - e3af49b14b - lavu 55.47.100 - frame.h Add AVFrame.opaque_ref. 2017-01-31 - 2eab48177d - lavu 55.46.100 / 55.20.0 - cpu.h Add AV_CPU_FLAG_SSSE3SLOW. 2017-01-24 - c4618f842a - lavu 55.45.100 - channel_layout.h Add av_get_extended_channel_layout() 2017-01-22 - 76c5a69e26 - lavu 55.44.100 - lfg.h Add av_lfg_init_from_data(). 2017-01-17 - 2a4a8653b6 - lavc 57.74.100 - vaapi.h Deprecate struct vaapi_context and the vaapi.h installed header. Callers should set AVCodecContext.hw_frames_ctx instead. 2017-01-12 - dbe9dbed31 - lavfi 6.69.100 - buffersink.h Add av_buffersink_get_*() functions. 2017-01-06 - 9488032e10 - lavf 57.62.100 - avio.h Add avio_get_dyn_buf() 2016-12-10 - f542b152aa - lavu 55.43.100 - imgutils.h Add av_image_check_size2() 2016-12-07 - e7a6f8c972 - lavc 57.67.100 / 57.29.0 - avcodec.h Add AV_PKT_DATA_SPHERICAL packet side data to export AVSphericalMapping information from containers. 2016-12-07 - 8f58ecc344 - lavu 55.42.100 / 55.30.0 - spherical.h Add AV_FRAME_DATA_SPHERICAL value, av_spherical_alloc() API and AVSphericalMapping type to export and describe spherical video properties. 2016-11-18 - 2ab50647ff - lavf 57.58.100 - avformat.h Add av_stream_add_side_data(). 2016-11-13 - 775a8477b7 - lavu 55.39.100 - hwcontext_vaapi.h Add AV_VAAPI_DRIVER_QUIRK_ATTRIB_MEMTYPE. 2016-11-13 - a8d51bb424 - lavu 55.38.100 - hwcontext_vaapi.h Add driver quirks field to VAAPI-specific hwdevice and enum with members AV_VAAPI_DRIVER_QUIRK_* to represent its values. 2016-11-10 - 638b216d4f - lavu 55.36.100 - pixfmt.h Add AV_PIX_FMT_GRAY12(LE/BE). -------- 8< --------- FFmpeg 3.2 was cut here -------- 8< --------- 2016-10-24 - 73ead47 - lavf 57.55.100 - avformat.h Add AV_DISPOSITION_TIMED_THUMBNAILS 2016-10-24 - a246fef - lavf 57.54.100 - avformat.h Add avformat_init_output() and AVSTREAM_INIT_IN_ macros 2016-10-22 - f5495c9 - lavu 55.33.100 - avassert.h Add av_assert0_fpu() / av_assert2_fpu() 2016-10-07 - 3f9137c / 32c8359 - lavc 57.61.100 / 57.24.0 - avcodec.h Decoders now export the frame timestamp as AVFrame.pts. It was previously exported as AVFrame.pkt_pts, which is now deprecated. Note: When decoding, AVFrame.pts uses the stream/packet timebase, and not the codec timebase. 2016-09-28 - eba0414 - lavu 55.32.100 / 55.16.0 - hwcontext.h hwcontext_qsv.h Add AV_HWDEVICE_TYPE_QSV and a new installed header with QSV-specific hwcontext definitions. 2016-09-26 - 32c25f0 - lavc 57.59.100 / 57.23.0 - avcodec.h AVCodecContext.hw_frames_ctx now may be used by decoders. 2016-09-27 - f0b6f72 - lavf 57.51.100 - avformat.h Add av_stream_get_codec_timebase() 2016-09-27 - 23c0779 - lswr 2.2.100 - swresample.h Add swr_build_matrix(). 2016-09-23 - 30d3e36 - lavc 57.58.100 - avcodec.h Add AV_CODEC_CAP_AVOID_PROBING codec capability flag. 2016-09-14 - ae1dd0c - lavf 57.49.100 - avformat.h Add avformat_transfer_internal_stream_timing_info helper to help with stream copy. 2016-08-29 - 4493390 - lavfi 6.58.100 - avfilter.h Add AVFilterContext.nb_threads. 2016-08-15 - c3c4c72 - lavc 57.53.100 - avcodec.h Add trailing_padding to AVCodecContext to match the corresponding field in AVCodecParameters. 2016-08-15 - b746ed7 - lavc 57.52.100 - avcodec.h Add a new API for chained BSF filters and passthrough (null) BSF -- av_bsf_list_alloc(), av_bsf_list_free(), av_bsf_list_append(), av_bsf_list_append2(), av_bsf_list_finalize(), av_bsf_list_parse_str() and av_bsf_get_null_filter(). 2016-08-04 - 82a33c8 - lavf 57.46.100 - avformat.h Add av_get_frame_filename2() 2016-07-09 - 775389f / 90f469a - lavc 57.50.100 / 57.20.0 - avcodec.h Add FF_PROFILE_H264_MULTIVIEW_HIGH and FF_PROFILE_H264_STEREO_HIGH. 2016-06-30 - c1c7e0ab - lavf 57.41.100 - avformat.h Moved codecpar field from AVStream to the end of the struct, so that the following private fields are in the same location as in FFmpeg 3.0 (lavf 57.25.100). 2016-06-30 - 042fb69d - lavu 55.28.100 - frame.h Moved hw_frames_ctx field from AVFrame to the end of the struct, so that the following private fields are in the same location as in FFmpeg 3.0 (lavu 55.17.103). 2016-06-29 - 1a751455 - lavfi 6.47.100 - avfilter.h Fix accidental ABI breakage in AVFilterContext. ABI was broken in 8688d3a, lavfi 6.42.100 and released as ffmpeg 3.1. Because of this, ffmpeg and ffplay built against lavfi>=6.42.100 will not be compatible with lavfi>=6.47.100. Potentially also affects other users of libavfilter if they are using one of the affected fields. -------- 8< --------- FFmpeg 3.1 was cut here -------- 8< --------- 2016-06-26 - 481f320 / 1c9e861 - lavu 55.27.100 / 55.13.0 - hwcontext.h Add av_hwdevice_ctx_create(). 2016-06-26 - b95534b / e47b8bb - lavc 57.48.101 / 57.19.1 - avcodec.h Adjust values for JPEG 2000 profiles. 2016-06-23 - 5d75e46 / db7968b - lavf 57.40.100 / 57.7.0 - avio.h Add AVIODataMarkerType, write_data_type, ignore_boundary_point and avio_write_marker. 2016-06-23 - abb3cc4 / 0c4468d - lavu 55.26.100 / 55.12.0 - opt.h Add av_stereo3d_type_name() and av_stereo3d_from_name(). 2016-06-22 - 3689efe / c46db38 - lavu 55.25.100 / 55.11.0 - hwcontext_dxva2.h Add new installed header with DXVA2-specific hwcontext definitions. 2016-04-27 - fb91871 - lavu 55.23.100 - log.h Add a new function av_log_format_line2() which returns number of bytes written to the target buffer. 2016-04-21 - 7fc329e - lavc 57.37.100 - avcodec.h Add a new audio/video encoding and decoding API with decoupled input and output -- avcodec_send_packet(), avcodec_receive_frame(), avcodec_send_frame() and avcodec_receive_packet(). 2016-04-17 - af9cac1 / 33d1898 - lavc 57.35.100 / 57.15.0 - avcodec.h Add a new bitstream filtering API working with AVPackets. Deprecate the old bitstream filtering API. 2016-04-14 - 8688d3a / 07a844f - lavfi 6.42.100 / 6.3.0 - avfilter.h Add AVFilterContext.hw_device_ctx. 2016-04-14 - 28abb21 / 551c677 - lavu 55.22.100 / 55.9.0 - hwcontext_vaapi.h Add new installed header with VAAPI-specific hwcontext definitions.