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/*
* Direct3D 12 HW acceleration video decoder
*
* copyright (c) 2022-2023 Wu Jianhua <toqsxw@outlook.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_D3D12VA_DECODE_H
#define AVCODEC_D3D12VA_DECODE_H
#include "libavutil/fifo.h"
#include "libavutil/hwcontext.h"
#include "libavutil/hwcontext_d3d12va.h"
#include "avcodec.h"
#include "internal.h"
#include "hwaccel_internal.h"
/**
* @brief This structure is used to provide the necessary configurations and data
* to the FFmpeg Direct3D 12 HWAccel implementation for video decoder.
*/
typedef struct D3D12VADecodeContext {
AVBufferRef *decoder_ref;
/**
* D3D12 video decoder
*/
ID3D12VideoDecoder *decoder;
/**
* D3D12 video decoder heap
*/
ID3D12VideoDecoderHeap *decoder_heap;
/**
* D3D12 configuration used to create the decoder
*
* Specified by decoders
*/
D3D12_VIDEO_DECODE_CONFIGURATION cfg;
/**
* A cached queue for reusing the D3D12 command allocators and upload buffers
*
* @see https://learn.microsoft.com/en-us/windows/win32/direct3d12/recording-command-lists-and-bundles#id3d12commandallocator
*/
AVFifo *objects_queue;
/**
* D3D12 command queue
*/
ID3D12CommandQueue *command_queue;
/**
* D3D12 video decode command list
*/
ID3D12VideoDecodeCommandList *command_list;
/**
* The array of resources used for reference frames
*
* The ref_resources.length is the same as D3D12VADecodeContext.max_num_ref
*/
ID3D12Resource **ref_resources;
/**
* The array of subresources used for reference frames
*
* The ref_subresources.length is the same as D3D12VADecodeContext.max_num_ref
*/
UINT *ref_subresources;
/**
* Maximum number of reference frames
*/
UINT max_num_ref;
/**
* Used mask used to record reference frames indices
*/
UINT used_mask;
/**
* Bitstream size for each frame
*/
UINT bitstream_size;
/**
* The sync context used to sync command queue
*/
AVD3D12VASyncContext sync_ctx;
/**
* A pointer to AVD3D12VADeviceContext used to create D3D12 objects
*/
AVD3D12VADeviceContext *device_ctx;
/**
* Pixel format
*/
enum AVPixelFormat pix_fmt;
/**
* Private to the FFmpeg AVHWAccel implementation
*/
unsigned report_id;
/**
* The Reference-Only feature in DirectX 12 is a memory optimization
* technique designed for video decoding/encoding scenarios.
* This feature requires that reference resources must be allocated
* with the `D3D12_RESOURCE_FLAG_VIDEO_DECODE_REFERENCE_ONLY` resource flag.
* Reference textures must also be separated from output textures.
* reference_only_map used as a storage for reference only frames
* ref_only_resources used as a shadow for ref_resources
*/
void *reference_only_map;
ID3D12Resource **ref_only_resources;
} D3D12VADecodeContext;
/**
* @}
*/
#define D3D12VA_VIDEO_DEC_ASYNC_DEPTH 36
#define D3D12VA_DECODE_CONTEXT(avctx) ((D3D12VADecodeContext *)((avctx)->internal->hwaccel_priv_data))
#define D3D12VA_FRAMES_CONTEXT(avctx) ((AVHWFramesContext *)(avctx)->hw_frames_ctx->data)
/**
* @brief Get a suitable maximum bitstream size
*
* Creating and destroying a resource on d3d12 needs sync and reallocation, so use this function
* to help allocate a big enough bitstream buffer to avoid recreating resources when decoding.
*
* @return the suitable size
*/
int ff_d3d12va_get_suitable_max_bitstream_size(AVCodecContext *avctx);
/**
* @brief init D3D12VADecodeContext
*
* @return Error code (ret < 0 if failed)
*/
int ff_d3d12va_decode_init(AVCodecContext *avctx);
/**
* @brief uninit D3D12VADecodeContext
*
* @return Error code (ret < 0 if failed)
*/
int ff_d3d12va_decode_uninit(AVCodecContext *avctx);
/**
* @brief d3d12va common frame params
*
* @return Error code (ret < 0 if failed)
*/
int ff_d3d12va_common_frame_params(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx);
/**
* @brief d3d12va common end frame
*
* @param avctx codec context
* @param frame current output frame
* @param pp picture parameters
* @param pp_size the size of the picture parameters
* @param qm quantization matrix
* @param qm_size the size of the quantization matrix
* @param callback update decoder-specified input stream arguments
* @return Error code (ret < 0 if failed)
*/
int ff_d3d12va_common_end_frame(AVCodecContext *avctx, AVFrame *frame,
const void *pp, unsigned pp_size,
const void *qm, unsigned qm_size,
int(*)(AVCodecContext *, D3D12_VIDEO_DECODE_INPUT_STREAM_ARGUMENTS *, ID3D12Resource *));
#endif /* AVCODEC_D3D12VA_DEC_H */
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