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74 lines
3.3 KiB
74 lines
3.3 KiB
Release Notes |
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============= |
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* 12 "Not Enough Trocadero" |
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General notes |
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------------- |
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This release once again bumps the major versions of all the libraries, removing |
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some long-deprecated APIs. This means that it is neither API nor ABI-compatible |
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with the previous release. The users who still did not update their code are |
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advised to look at the next section of these release notes, the doc/APIchanges |
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file and the API migration guide on our wiki. If those are not sufficient, do |
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not hesitate to contact us on IRC or through the user mailing list. |
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Among the main highlights of this release are several additions related to |
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hardware acceleration. There is a new API for managing hardware devices and |
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frame pools, which allows to add new features such as zero-copy |
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hardware-accelerated filtering with libavfilter and should reduce the |
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boilerplate code required for existing hardware-accelerated decoders. We have |
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added QuickSync decoding and encoding, NVENC encoding and CUDA image scaling, |
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VAAPI encoding and image scaling, OpenMAX encoding, MMAL decoding and Direct3D11 |
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decoding. |
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Other significant additions not related to hardware acceleration include |
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decoders for Canopus HQ/HQA and HQX, Go2Meeting, AAC ELD, TDSC, Hap, DXV, SPV1, |
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and a new ASF demuxer written according to the specification. There were also |
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countless smaller changes and bug fixes. |
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See the Changelog file for a more extensive list of significant changes. |
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API changes |
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----------- |
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A number of additional APIs have been introduced and some existing functions |
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have been deprecated and are scheduled for removal in the next release. |
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Significant API changes include: |
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[libavcodec] |
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+ Added an object for storing codec parameters (AVCodecParameters) and its |
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related API. It will now replace AVCodecContext everywhere except the actual |
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encoders/decoders. |
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+- Added a new API for handling refcounted AVPackets, mirroring the AVFrame API. |
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Deprecated certain old ill-defined AVPacket functions. |
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+- Added a new API for audio/video encoding and decoding, with decoupled input |
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and output. This will e.g. allow a decoder to produce multiple output frames |
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for a single input packet, which was not possible with the previous API. All |
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users are strongly encouraged to switch to this new API as soon as possible, |
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since certain decoders and encoders might start requiring the new API to be |
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used. |
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+- Added a new API for bitstream filtering, which works with refcounted |
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AVPackets and is more clearly defined and documented. The old bitstream |
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filtering API is now deprecated. |
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[libavformat] |
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+ Added new IO callbacks to AVFormatContext, allowing the caller to provide |
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custom IO for certain special muxers and demuxers. |
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+- Replaced AVStream.codec (AVCodecContext) with AVStream.codecpar |
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(AVCodecParameters) as the means of signalling codec parameters between the |
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muxers/demuxers and the caller. |
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[libavutil] |
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+ Added a new API (hwcontext.h) for handling hardware acceleration devices and |
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hardware frame pools. |
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[libavfilter] |
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+ Added a new struct, AVBufferSrcParameters, for passing the stream parameters |
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to the buffer source. It is now the recommended way of configuring the buffer |
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source. |
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+ Added AVFilterContext.hw_device_ctx and AVFilterLink.hw_frames_ctx that allow |
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hardware frames to be used in filter graphs. |
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Please see the file doc/APIchanges for details along with similar |
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programmer-centric information.
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