libavcodec/d3d12va_h264.c - third_party/ffmpeg - Git at Google

 /*
  * Direct3D 12 h264 HW acceleration
  *
  * 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
  */

 #include "config_components.h"
 #include "libavutil/avassert.h"
 #include "h264dec.h"
 #include "h264data.h"
 #include "h264_ps.h"
 #include "mpegutils.h"
 #include "dxva2_internal.h"
 #include "d3d12va_decode.h"
 #include "libavutil/hwcontext_d3d12va_internal.h"
 #include <dxva.h>

 typedef struct H264DecodePictureContext {
     DXVA_PicParams_H264   pp;
     DXVA_Qmatrix_H264     qm;
     unsigned              slice_count;
     DXVA_Slice_H264_Short slice_short[MAX_SLICES];
     const uint8_t         *bitstream;
     unsigned              bitstream_size;
 } H264DecodePictureContext;

 static void fill_slice_short(DXVA_Slice_H264_Short *slice,
                              unsigned position, unsigned size)
 {
     memset(slice, 0, sizeof(*slice));
     slice->BSNALunitDataLocation = position;
     slice->SliceBytesInBuffer    = size;
     slice->wBadSliceChopping     = 0;
 }

 static int d3d12va_h264_start_frame(AVCodecContext *avctx,
                                   av_unused const uint8_t *buffer,
                                   av_unused uint32_t size)
 {
     const H264Context        *h       = avctx->priv_data;
     H264DecodePictureContext *ctx_pic = h->cur_pic_ptr->hwaccel_picture_private;
     D3D12VADecodeContext     *ctx     = D3D12VA_DECODE_CONTEXT(avctx);

     if (!ctx)
         return -1;

     av_assert0(ctx_pic);

     ctx->used_mask = 0;

     ff_dxva2_h264_fill_picture_parameters(avctx, (AVDXVAContext *)ctx, &ctx_pic->pp);

     ff_dxva2_h264_fill_scaling_lists(avctx, (AVDXVAContext *)ctx, &ctx_pic->qm);

     ctx_pic->slice_count    = 0;
     ctx_pic->bitstream_size = 0;
     ctx_pic->bitstream      = NULL;

     return 0;
 }

 static int d3d12va_h264_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
 {
     unsigned position;
     const H264Context        *h               = avctx->priv_data;
     const H264SliceContext   *sl              = &h->slice_ctx[0];
     const H264Picture        *current_picture = h->cur_pic_ptr;
     H264DecodePictureContext *ctx_pic         = current_picture->hwaccel_picture_private;

     if (ctx_pic->slice_count >= MAX_SLICES)
         return AVERROR(ERANGE);

     if (!ctx_pic->bitstream)
         ctx_pic->bitstream = buffer;
     ctx_pic->bitstream_size += size;

     position = buffer - ctx_pic->bitstream;
     fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count], position, size);
     ctx_pic->slice_count++;

     if (sl->slice_type != AV_PICTURE_TYPE_I && sl->slice_type != AV_PICTURE_TYPE_SI)
         ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */

     return 0;
 }

 #define START_CODE 65536
 #define START_CODE_SIZE 3
 static int update_input_arguments(AVCodecContext *avctx, D3D12_VIDEO_DECODE_INPUT_STREAM_ARGUMENTS *input_args, ID3D12Resource *buffer)
 {
     const H264Context        *h               = avctx->priv_data;
     const H264Picture        *current_picture = h->cur_pic_ptr;
     H264DecodePictureContext *ctx_pic         = current_picture->hwaccel_picture_private;

     int i;
     uint8_t *mapped_data, *mapped_ptr;
     DXVA_Slice_H264_Short *slice;
     D3D12_VIDEO_DECODE_FRAME_ARGUMENT *args;

     if (FAILED(ID3D12Resource_Map(buffer, 0, NULL, (void **)&mapped_data))) {
         av_log(avctx, AV_LOG_ERROR, "Failed to map D3D12 Buffer resource!\n");
         return AVERROR(EINVAL);
     }

     mapped_ptr = mapped_data;
     for (i = 0; i < ctx_pic->slice_count; i++) {
         UINT position, size;
         slice = &ctx_pic->slice_short[i];

         position = slice->BSNALunitDataLocation;
         size     = slice->SliceBytesInBuffer;

         slice->SliceBytesInBuffer += START_CODE_SIZE;
         slice->BSNALunitDataLocation = mapped_ptr - mapped_data;

         *(uint32_t *)mapped_ptr = START_CODE;
         mapped_ptr += START_CODE_SIZE;

         memcpy(mapped_ptr, &ctx_pic->bitstream[position], size);
         mapped_ptr += size;
     }

     ID3D12Resource_Unmap(buffer, 0, NULL);

     input_args->CompressedBitstream = (D3D12_VIDEO_DECODE_COMPRESSED_BITSTREAM){
         .pBuffer = buffer,
         .Offset  = 0,
         .Size    = mapped_ptr - mapped_data,
     };

     args = &input_args->FrameArguments[input_args->NumFrameArguments++];
     args->Type  = D3D12_VIDEO_DECODE_ARGUMENT_TYPE_SLICE_CONTROL;
     args->Size  = sizeof(DXVA_Slice_H264_Short) * ctx_pic->slice_count;
     args->pData = ctx_pic->slice_short;

     return 0;
 }

 static int d3d12va_h264_end_frame(AVCodecContext *avctx)
 {
     H264Context               *h       = avctx->priv_data;
     H264DecodePictureContext  *ctx_pic = h->cur_pic_ptr->hwaccel_picture_private;
     H264SliceContext          *sl      = &h->slice_ctx[0];

     int ret;

     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
         return -1;

     ret = ff_d3d12va_common_end_frame(avctx, h->cur_pic_ptr->f,
                                       &ctx_pic->pp, sizeof(ctx_pic->pp),
                                       &ctx_pic->qm, sizeof(ctx_pic->qm),
                                       update_input_arguments);
     if (!ret)
         ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);

     return ret;
 }

 static int d3d12va_h264_decode_init(AVCodecContext *avctx)
 {
     D3D12VADecodeContext *ctx = D3D12VA_DECODE_CONTEXT(avctx);
     DXVA_PicParams_H264 pp;

     ctx->cfg.DecodeProfile = D3D12_VIDEO_DECODE_PROFILE_H264;

     ctx->max_num_ref = FF_ARRAY_ELEMS(pp.RefFrameList) + 1;

     return ff_d3d12va_decode_init(avctx);
 }

 #if CONFIG_H264_D3D12VA_HWACCEL
 const FFHWAccel ff_h264_d3d12va_hwaccel = {
     .p.name               = "h264_d3d12va",
     .p.type               = AVMEDIA_TYPE_VIDEO,
     .p.id                 = AV_CODEC_ID_H264,
     .p.pix_fmt            = AV_PIX_FMT_D3D12,
     .init                 = d3d12va_h264_decode_init,
     .uninit               = ff_d3d12va_decode_uninit,
     .start_frame          = d3d12va_h264_start_frame,
     .decode_slice         = d3d12va_h264_decode_slice,
     .end_frame            = d3d12va_h264_end_frame,
     .frame_params         = ff_d3d12va_common_frame_params,
     .frame_priv_data_size = sizeof(H264DecodePictureContext),
     .priv_data_size       = sizeof(D3D12VADecodeContext),
 };
 #endif
	/*
	* Direct3D 12 h264 HW acceleration
	*
	* 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
	*/

	#include "config_components.h"
	#include "libavutil/avassert.h"
	#include "h264dec.h"
	#include "h264data.h"
	#include "h264_ps.h"
	#include "mpegutils.h"
	#include "dxva2_internal.h"
	#include "d3d12va_decode.h"
	#include "libavutil/hwcontext_d3d12va_internal.h"
	#include <dxva.h>

	typedef struct H264DecodePictureContext {
	DXVA_PicParams_H264 pp;
	DXVA_Qmatrix_H264 qm;
	unsigned slice_count;
	DXVA_Slice_H264_Short slice_short[MAX_SLICES];
	const uint8_t *bitstream;
	unsigned bitstream_size;
	} H264DecodePictureContext;

	static void fill_slice_short(DXVA_Slice_H264_Short *slice,
	unsigned position, unsigned size)
	{
	memset(slice, 0, sizeof(*slice));
	slice->BSNALunitDataLocation = position;
	slice->SliceBytesInBuffer = size;
	slice->wBadSliceChopping = 0;
	}

	static int d3d12va_h264_start_frame(AVCodecContext *avctx,
	av_unused const uint8_t *buffer,
	av_unused uint32_t size)
	{
	const H264Context *h = avctx->priv_data;
	H264DecodePictureContext *ctx_pic = h->cur_pic_ptr->hwaccel_picture_private;
	D3D12VADecodeContext *ctx = D3D12VA_DECODE_CONTEXT(avctx);

	if (!ctx)
	return -1;

	av_assert0(ctx_pic);

	ctx->used_mask = 0;

	ff_dxva2_h264_fill_picture_parameters(avctx, (AVDXVAContext *)ctx, &ctx_pic->pp);

	ff_dxva2_h264_fill_scaling_lists(avctx, (AVDXVAContext *)ctx, &ctx_pic->qm);

	ctx_pic->slice_count = 0;
	ctx_pic->bitstream_size = 0;
	ctx_pic->bitstream = NULL;

	return 0;
	}

	static int d3d12va_h264_decode_slice(AVCodecContext avctx, const uint8_t buffer, uint32_t size)
	{
	unsigned position;
	const H264Context *h = avctx->priv_data;
	const H264SliceContext *sl = &h->slice_ctx[0];
	const H264Picture *current_picture = h->cur_pic_ptr;
	H264DecodePictureContext *ctx_pic = current_picture->hwaccel_picture_private;

	if (ctx_pic->slice_count >= MAX_SLICES)
	return AVERROR(ERANGE);

	if (!ctx_pic->bitstream)
	ctx_pic->bitstream = buffer;
	ctx_pic->bitstream_size += size;

	position = buffer - ctx_pic->bitstream;
	fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count], position, size);
	ctx_pic->slice_count++;

	if (sl->slice_type != AV_PICTURE_TYPE_I && sl->slice_type != AV_PICTURE_TYPE_SI)
	ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */

	return 0;
	}

	#define START_CODE 65536
	#define START_CODE_SIZE 3
	static int update_input_arguments(AVCodecContext avctx, D3D12_VIDEO_DECODE_INPUT_STREAM_ARGUMENTS input_args, ID3D12Resource *buffer)
	{
	const H264Context *h = avctx->priv_data;
	const H264Picture *current_picture = h->cur_pic_ptr;
	H264DecodePictureContext *ctx_pic = current_picture->hwaccel_picture_private;

	int i;
	uint8_t mapped_data, mapped_ptr;
	DXVA_Slice_H264_Short *slice;
	D3D12_VIDEO_DECODE_FRAME_ARGUMENT *args;

	if (FAILED(ID3D12Resource_Map(buffer, 0, NULL, (void **)&mapped_data))) {
	av_log(avctx, AV_LOG_ERROR, "Failed to map D3D12 Buffer resource!\n");
	return AVERROR(EINVAL);
	}

	mapped_ptr = mapped_data;
	for (i = 0; i < ctx_pic->slice_count; i++) {
	UINT position, size;
	slice = &ctx_pic->slice_short[i];

	position = slice->BSNALunitDataLocation;
	size = slice->SliceBytesInBuffer;

	slice->SliceBytesInBuffer += START_CODE_SIZE;
	slice->BSNALunitDataLocation = mapped_ptr - mapped_data;

	(uint32_t )mapped_ptr = START_CODE;
	mapped_ptr += START_CODE_SIZE;

	memcpy(mapped_ptr, &ctx_pic->bitstream[position], size);
	mapped_ptr += size;
	}

	ID3D12Resource_Unmap(buffer, 0, NULL);

	input_args->CompressedBitstream = (D3D12_VIDEO_DECODE_COMPRESSED_BITSTREAM){
	.pBuffer = buffer,
	.Offset = 0,
	.Size = mapped_ptr - mapped_data,
	};

	args = &input_args->FrameArguments[input_args->NumFrameArguments++];
	args->Type = D3D12_VIDEO_DECODE_ARGUMENT_TYPE_SLICE_CONTROL;
	args->Size = sizeof(DXVA_Slice_H264_Short) * ctx_pic->slice_count;
	args->pData = ctx_pic->slice_short;

	return 0;
	}

	static int d3d12va_h264_end_frame(AVCodecContext *avctx)
	{
	H264Context *h = avctx->priv_data;
	H264DecodePictureContext *ctx_pic = h->cur_pic_ptr->hwaccel_picture_private;
	H264SliceContext *sl = &h->slice_ctx[0];

	int ret;

	if (ctx_pic->slice_count <= 0 \|\| ctx_pic->bitstream_size <= 0)
	return -1;

	ret = ff_d3d12va_common_end_frame(avctx, h->cur_pic_ptr->f,
	&ctx_pic->pp, sizeof(ctx_pic->pp),
	&ctx_pic->qm, sizeof(ctx_pic->qm),
	update_input_arguments);
	if (!ret)
	ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);

	return ret;
	}

	static int d3d12va_h264_decode_init(AVCodecContext *avctx)
	{
	D3D12VADecodeContext *ctx = D3D12VA_DECODE_CONTEXT(avctx);
	DXVA_PicParams_H264 pp;

	ctx->cfg.DecodeProfile = D3D12_VIDEO_DECODE_PROFILE_H264;

	ctx->max_num_ref = FF_ARRAY_ELEMS(pp.RefFrameList) + 1;

	return ff_d3d12va_decode_init(avctx);
	}

	#if CONFIG_H264_D3D12VA_HWACCEL
	const FFHWAccel ff_h264_d3d12va_hwaccel = {
	.p.name = "h264_d3d12va",
	.p.type = AVMEDIA_TYPE_VIDEO,
	.p.id = AV_CODEC_ID_H264,
	.p.pix_fmt = AV_PIX_FMT_D3D12,
	.init = d3d12va_h264_decode_init,
	.uninit = ff_d3d12va_decode_uninit,
	.start_frame = d3d12va_h264_start_frame,
	.decode_slice = d3d12va_h264_decode_slice,
	.end_frame = d3d12va_h264_end_frame,
	.frame_params = ff_d3d12va_common_frame_params,
	.frame_priv_data_size = sizeof(H264DecodePictureContext),
	.priv_data_size = sizeof(D3D12VADecodeContext),
	};
	#endif