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/*
* 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)
{
D3D12VADecodeContext *ctx = D3D12VA_DECODE_CONTEXT(avctx);
AVHWFramesContext *frames_ctx = D3D12VA_FRAMES_CONTEXT(avctx);
AVD3D12VAFramesContext *frames_hwctx = frames_ctx->hwctx;
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, &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
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