spolifroni-amd
134369824d
* Updated core docs + Doxyfile * fixed issues, renamed a file, deleted unused files * added hip-dev as a requirement for 7.2 * updated with Jeff's review * updated getvideoframe description * Update docs/reference/rocDecode-parser.rst Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com> * Update docs/how-to/using-rocDecode-video-decoder.rst Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com> * updated with Leo's feedback * fixed a wrong link in toc --------- Co-authored-by: Kiriti Gowda <kiritigowda@gmail.com> Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>
62 wiersze
4.3 KiB
ReStructuredText
62 wiersze
4.3 KiB
ReStructuredText
.. meta::
|
|
:description: The rocDecode software decoder
|
|
:keywords: decode, video decoder, video decoding, rocDecode, core APIs, AMD, ROCm
|
|
|
|
********************************************************************
|
|
The rocDecode software decoder API
|
|
********************************************************************
|
|
|
|
The rocDecode software decoder API exposed in |rocdecodehost|_ is used to decode frames that have been demultiplexed (demuxed) by :doc:`the FFmpeg demuxer <../how-to/using-rocDecode-ffmpeg>`.
|
|
|
|
Decoding parameters are stored in the ``RocDecoderHostCreateInfo`` struct and passed to ``rocDecCreateDecoderHost()`` to create a new software decoder. ``rocDecCreateDecoderHost()`` returns a handle to the decoder. For example:
|
|
|
|
.. code:: cpp
|
|
|
|
RocDecoderHostCreateInfo create_info = {};
|
|
create_info.codec_type = rocdec_codec_id;
|
|
create_info.num_decode_threads = 0; // default
|
|
create_info.max_width = DEFAULT_WIDTH;
|
|
create_info.max_height = DEFAULT_HEIGHT;
|
|
create_info.chroma_format = rocDecVideoChromaFormat_420;
|
|
create_info.output_format = rocDecVideoSurfaceFormat_P016;
|
|
create_info.bit_depth_minus_8 = 2;
|
|
create_info.num_output_surfaces = 1;
|
|
create_info.user_data = &dec_info;
|
|
rocDecCreateDecoderHost(&dec_info.decoder, &create_info);
|
|
|
|
``rocDecGetDecoderCapsHost()`` queries the capabilities of the underlying software video decoder. Decoder capabilities usually include supported codecs, maximum resolution, and
|
|
bit depth.
|
|
|
|
``rocDecDecodeFrameHost()`` is used to submit frames for software decoding. ``rocDecDecodeFrameHost()`` takes the decoder handle and the pointer to the ``RocdecPicParamsHost`` struct and initiates the video decoding. ``RocdecPicParamsHost`` is populated with the decoded frame information.
|
|
|
|
The ``pfn_sequence_callback`` callback is triggered when a format change occurs or when a new sequence header is encountered. This callback must be registered in any application that uses the software decoder and its implementation must call ``rocDecReconfigureDecoderHost()`` to reconfigure the decoder to handle the new sequence or format.
|
|
|
|
``rocDecGetDecodeStatusHost()`` can be called to query the decoding status of a frame. The result of the query is either ``rocDecodeStatus_Success``, if decoding is complete, or ``rocDecodeStatus_InProgress``, if decoding is still in progress.
|
|
|
|
The ``pfn_display_picture`` callback is triggered when a frame has been decoded. This callback must be registered by any application that uses the software decoder and its implementation must call ``rocDecGetVideoFrameHost()``. ``rocDecGetVideoFrameHost()`` returns the decoded frame's host memory pointer. The decoded frame can then be further processed using this pointer.
|
|
|
|
``rocDecGetVideoFrameHost()`` provides a way to access the decoded frame in host memory. This is a blocking call that only returns once both frame decoding and memory mapping are done. It returns the host memory pointer as well as information about the :doc:`output surface type <../conceptual/rocDecode-memory-types>`.
|
|
|
|
If the output surface type is ``OUT_SURFACE_MEM_DEV_INTERNAL``, meaning intermediate GPU memory, the direct pointer to the decoded surface is provided. If the requested surface
|
|
type is ``OUT_SURFACE_MEM_DEV_COPIED`` or ``OUT_SURFACE_MEM_HOST_COPIED``, the internal decoded frame is copied to another buffer, either in device memory or host memory.
|
|
|
|
Once decoding is complete, ``rocDecDestroyDecoderHost()`` must be called to destroy the decoder and free resources.
|
|
|
|
.. |apifolder| replace:: ``api/rocdecode``
|
|
.. _apifolder: https://github.com/ROCm/rocDecode/tree/develop/api/rocdecode
|
|
|
|
.. |rocparser| replace:: ``api/rocdecode/rocparser.h``
|
|
.. _rocparser: https://github.com/ROCm/rocDecode/tree/develop/api/rocdecode/rocparser.h
|
|
|
|
.. |rocdecode| replace:: ``api/rocDecode/rocdecode.h``
|
|
.. _rocdecode: https://github.com/ROCm/rocDecode/tree/develop/api/rocdecode/rocdecode.h
|
|
|
|
.. |rocdecodehost| replace:: ``api/rocDecode/rocdecode_host.h``
|
|
.. _rocdecodehost: https://github.com/ROCm/rocDecode/tree/develop/api/rocdecode/rocdecode_host.h
|
|
|
|
.. |bitstreamreader| replace:: ``api/rocDecode/roc_bitstream_reader.h``
|
|
.. _bitstreamreader: https://github.com/ROCm/rocDecode/tree/develop/api/rocdecode/roc_bitstream_reader.h
|
|
|
|
.. |utilsfolder| replace:: ``utils`` folder
|
|
.. _utilsfolder: https://github.com/ROCm/rocDecode/tree/develop/utils
|