User guide Updates (#179)
* user guide intial * clean up * review comments * clean up * clean up * review comments + new smaples section * review comments+adding chapter 4 and 5 * review comments
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Lakshmi Kumar
GitHub
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## Contents
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#### Chapter 1 Overview
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1.1 Supported Codecs
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#### Chapter 2 Decoder Capabalities
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#### Chapter 3 Decoder Pipeline
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1.1 Supported Codecs
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#### Chapter 2 rocDecode Hardware Capabalities
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#### Chapter 3 Video Decoding Pipeline
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#### Chapter 4 Using rocDecode API
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4.1 Video Parser \
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4.2 Querying decode capabilities \
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4.3 Creating a Decoder \
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4.4 Decoding the frame \
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4.5 Preparing the decoded frame for further processing \
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4.6 Getting data buffer \
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4.7 Querying the decoding status \
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4.8 Reconfiguring the decoder \
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4.9 Destroying the decoder
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4.1 Video Parser
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4.2 Querying decode capabilities
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4.3 Creating a Decoder
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4.4 Decoding the frame
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4.5 Preparing the decoded frame for further processing
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4.6 Getting data buffer
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4.7 Querying the decoding status
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4.8 Reconfiguring the decoder
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4.9 Destroying the decoder
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#### Chapter 5 Samples
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5.1 Video Decode \
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5.2 Video Decode Performance \
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5.3 Video Decode Fork \
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5.4 Video Decode Memory \
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5.5 Video Decode Multiple Files \
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5.6 Video Decode RGB
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5.1 Video Decode
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5.2 Video Decode Performance
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5.3 Video Decode Fork
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5.4 Video Decode Memory
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5.5 Video Decode Multiple Files
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5.6 Video Decode RGB
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## Chapter 1 Overview
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AMD GPUs contain one or more hardware decoders as separate engines (VCNs) that provide fully accelerated hardware based video decoding. Hardware decoders consume lower power than CPU based decoders. Dedicated hardware decoders offload decoding tasks from CPU, boosting overall decoding throughput. And with proper power management, decoding on hardware decoders can lower the overall system power consumption.
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@@ -57,7 +57,7 @@ Table 1 shows the codec support and capabilities of the VCN for each GPU archite
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Table 1: Hardware video decoder capabilities
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## Chapter 3 Decoder Pipeline
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## Chapter 3 Video Decoding Pipeline
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There are three main components  in the rocDecode: Demuxer, Video Parser APIs, and Video Decode APIs.
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The Demuxer is based on FFMPEG. The demuxer extracts a segment of video data and sends it to the Video Parser. The parser then extracts crucial information such as picture and slice parameters, which is then sent to the Decoder APIs. These APIs submit the information to the hardware for the decoding of a frame. This process repeats in a loop until all frames have been decoded.
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The above steps are demonstrated in the [sample applications](../samples/) included in the repository.
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#### Chapter 4 Using rocDecode API
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## Chapter 4 Using rocDecode API
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All rocDecode APIs are exposed in the two header files: `rocdecode.h` and `rocparser.h`. These headers can be found under `api` folder in this repository. \ The samples use the `RocVideoDecoder` user class provided in `roc_video_dec.h` under the `utils` folder in this repository.
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All rocDecode APIs are exposed in the two header files: `rocdecode.h` and `rocparser.h`. These headers can be found under `api` folder in this repository. \
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The samples use the `RocVideoDecoder` user class provided in `roc_video_dec.h` under the `utils` folder in this repository.
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### 4.7 Querying the decoding status
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The `rocDecGetDecodeStatus()` can be called at any time to query the status of the decoding for given frame. A struct pointer `RocdecDecodeStatus*` will be filled and returned to the user.
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The inputs to the API are:
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* decoder_handle: A rocdec decoder handler `rocDecDecoderHandle`.
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* pic_idx: An int value for the picIdx for which the user wants a status.
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* decode_status: A pointer to `RocdecDecodeStatus` as return value.
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The API returns one of the following statuses:
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* Invalid (0): Decode status is not valid.
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* In Progress (1): Decoding is in progress.
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* Success (2): Decoding was successful and no errors were returned.
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* Error (8): The frame was corrupted, but the error was not concealed.
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* Error Concealed (9): The frame was corrupted and the error was concealed.
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* Displaying (10): Decode is completed, displaying in progress.
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### 4.8 Reconfiguring the decoder
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The `rocDecReconfigureDecoder()` can be called to reuse a single decoder for multiple clips. The API currently supports resolution changes, resize parameter changes, target area parameter changes for the same codec without having to destroy the ongoing decoder instance and creating a new one. This saves time and reduces latency.
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The inputs to the API are:
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* decoder_handle: A rocdec decoder handler `rocDecDecoderHandle`.
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* reconfig_params: The user needs to specify the parameters for the changes in `RocdecReconfigureDecoderInfo`. The ulWidth and ulHeight used for reconfiguration cannot exceed the values set for ulMaxWidth and ulMaxHeight defined at RocDecoderCreateInfo. If these values need to be changed, the session needs to be destroyed and recreated.
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The call to the `rocDecReconfigureDecoder()` must be called during `RocdecParserParams::pfnSequenceCallback`.
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### 4.9 Destroying the decoder
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The user needs to call the `rocDecDestroyDecoder()` to destroy the session and free up resources.
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The inputs to the API are:
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* decoder_handle: A rocdec decoder handler `rocDecDecoderHandle`.
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The API returns a `RocdecDecodeStatus` value.
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## Chapter 5 Samples
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The rocDecode repository provides samples to show different use cases. These can be found under the `samples` directory in this repository.
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### 5.1 Video Decode
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The video decode sample illustrates the use of the FFMPEG demuxer to get the individual frames and send it to the Video Parser. The parser then extracts crucial information such as picture and slice parameters, which is then sent to the Decoder APIs. These APIs submit the information to the hardware for the decoding of a frame. The sample also dumps the output YUV file for the user to view if requested. This inidividual frame is then released. This process repeats in a loop until all frames have been decoded.
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Instructions to run the sample can be found [here.](../samples/videoDecode/)
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### 5.2 Video Decode Performance
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The video decode performance sample creates multiple threads which demux and decode the same video in parallel. The demuxer uses FFMPEG to get the individual frames which are then sent to the decoder APIs. The sample waites for all the threads to complete execution to caluculate the toal FPS and total time taken.
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This sample shows scaling in performance for `N` VCN engines as per GPU architecture.
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Instructions to run the sample can be found [here.](../samples/videoDecodePerf/)
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### 5.3 Video Decode Fork
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The video decode fork sample creates multiple processes which demux and decode the same video in parallel. The demuxer uses FFMPEG to get the individual frames which are then sent to the decoder APIs. The sample uses shared memory to keep count of the number of frames decoded in the different processes. Each child process needs to exit successfully for the sample to complete successfully.
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This sample shows scaling in performance for `N` VCN engines as per GPU architecture.
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Instructions to run the sample can be found [here.](../samples/videoDecodeFork/)
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### 5.4 Video Decode Memory
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The video decode memory sample illustrates a way to pass the data chunk-by-chunk sequentially to the FFMPEG demuxer which are then decoded on AMD hardware using rocDecode library.
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The sample provides a user class `FileStreamProvider` derived from the existing `VideoDemuxer::StreamProvider` to read a video file and fill the buffer owned by the demuxer. It then takes frames from this buffer for further parsing and decoding.
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Instructions to run the sample can be found [here.](../samples/videoDecodeMem/)
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### 5.5 Video Decode Multiple Files
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The video decode multiple files sample illustrates the use of providing a list of files as input to showcase the reconfigure option in rocDecode library. The input video files have to be of the same codec type to use the reconfigure option but can have different resolution or resize parameters.
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The reconfigure option can be disabled by the user if needed. The input file is parsed line by line and data is stored in a queue. The individual video files are demuxed and decoded one after the other in a loop. Outpuot for each individual input file can also be stored if needed.
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Instructions to run the sample can be found [here.](../samples/videoDecodeMultiFiles/)
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### 5.6 Video Decode RGB
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This sample illustrates the FFMPEG demuxer to get the individual frames which are then decoded using rocDecode API and optionally color-converted using custom HIP kernels on AMD hardware. This sample converts decoded YUV output to one of the RGB or BGR formats(24bit, 32bit, 464bit).
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This sample uses HIP kernels to showcase the color conversion. The color conversion and decoding are run on separate threads to hide latency. Whenever a frame is ready after decoding, the `ColorSpaceConversionThread` is notified and can be used for post-processing.
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Instructions to run the sample can be found [here.](../samples/videoDecodeRGB/)
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