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/*
* Direct3D12 MPEG-2 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 "libavutil/hwcontext_d3d12va_internal.h"
#include "mpegutils.h"
#include "mpegvideodec.h"
#include "d3d12va_decode.h"
#include "dxva2_internal.h"
#define MAX_SLICES 1024
#define INVALID_REF 0xffff
#define REF_RESOURCE(index) if (index != INVALID_REF) { \
ctx->ref_resources[index] = frames_hwctx->texture_infos[index].texture; \
}
typedef struct D3D12DecodePictureContext {
DXVA_PictureParameters pp;
DXVA_QmatrixData qm;
unsigned slice_count;
DXVA_SliceInfo slices[MAX_SLICES];
const uint8_t *bitstream;
unsigned bitstream_size;
} D3D12DecodePictureContext;
static int d3d12va_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
{
const MpegEncContext *s = avctx->priv_data;
D3D12VADecodeContext *ctx = D3D12VA_DECODE_CONTEXT(avctx);
D3D12DecodePictureContext *ctx_pic = s->current_picture_ptr->hwaccel_picture_private;
if (!ctx)
return -1;
av_assert0(ctx_pic);
ctx->used_mask = 0;
ff_dxva2_mpeg2_fill_picture_parameters(avctx, (AVDXVAContext *)ctx, &ctx_pic->pp);
ff_dxva2_mpeg2_fill_quantization_matrices(avctx, (AVDXVAContext *)ctx, &ctx_pic->qm);
// Post processing operations are not supported in D3D12 Video
ctx_pic->pp.wDeblockedPictureIndex = INVALID_REF;
ctx_pic->bitstream = NULL;
ctx_pic->bitstream_size = 0;
ctx_pic->slice_count = 0;
return 0;
}
static int d3d12va_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
{
const MpegEncContext *s = avctx->priv_data;
D3D12DecodePictureContext *ctx_pic = s->current_picture_ptr->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;
ff_dxva2_mpeg2_fill_slice(avctx, &ctx_pic->slices[ctx_pic->slice_count++],
buffer - ctx_pic->bitstream, buffer, size);
return 0;
}
static int update_input_arguments(AVCodecContext *avctx, D3D12_VIDEO_DECODE_INPUT_STREAM_ARGUMENTS *input_args, ID3D12Resource *buffer)
{
const MpegEncContext *s = avctx->priv_data;
D3D12DecodePictureContext *ctx_pic = s->current_picture_ptr->hwaccel_picture_private;
const int is_field = s->picture_structure != PICT_FRAME;
const unsigned mb_count = s->mb_width * (s->mb_height >> is_field);
int i;
void *mapped_data = NULL;
D3D12_VIDEO_DECODE_FRAME_ARGUMENT *args = &input_args->FrameArguments[input_args->NumFrameArguments++];
D3D12_RANGE range = {
.Begin = 0,
.End = ctx_pic->bitstream_size,
};
if (FAILED(ID3D12Resource_Map(buffer, 0, &range, &mapped_data))) {
av_log(avctx, AV_LOG_ERROR, "Failed to map D3D12 Buffer resource!\n");
return AVERROR(EINVAL);
}
for (i = 0; i < ctx_pic->slice_count; i++) {
DXVA_SliceInfo *slice = &ctx_pic->slices[i];
if (i < ctx_pic->slice_count - 1)
slice->wNumberMBsInSlice = slice[1].wNumberMBsInSlice - slice[0].wNumberMBsInSlice;
else
slice->wNumberMBsInSlice = mb_count - slice[0].wNumberMBsInSlice;
}
memcpy(mapped_data, ctx_pic->bitstream, ctx_pic->bitstream_size);
ID3D12Resource_Unmap(buffer, 0, &range);
args->Type = D3D12_VIDEO_DECODE_ARGUMENT_TYPE_SLICE_CONTROL;
args->Size = sizeof(DXVA_SliceInfo) * ctx_pic->slice_count;
args->pData = ctx_pic->slices;
input_args->CompressedBitstream = (D3D12_VIDEO_DECODE_COMPRESSED_BITSTREAM){
.pBuffer = buffer,
.Offset = 0,
.Size = ctx_pic->bitstream_size,
};
return 0;
}
static int d3d12va_mpeg2_end_frame(AVCodecContext *avctx)
{
int ret;
MpegEncContext *s = avctx->priv_data;
D3D12DecodePictureContext *ctx_pic = s->current_picture_ptr->hwaccel_picture_private;
if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
return -1;
ret = ff_d3d12va_common_end_frame(avctx, s->current_picture_ptr->f, &ctx_pic->pp, sizeof(ctx_pic->pp),
&ctx_pic->qm, sizeof(ctx_pic->qm), update_input_arguments);
if (!ret)
ff_mpeg_draw_horiz_band(s, 0, avctx->height);
return ret;
}
static int d3d12va_mpeg2_decode_init(AVCodecContext *avctx)
{
D3D12VADecodeContext *ctx = D3D12VA_DECODE_CONTEXT(avctx);
ctx->cfg.DecodeProfile = D3D12_VIDEO_DECODE_PROFILE_MPEG2;
ctx->max_num_ref = 3;
return ff_d3d12va_decode_init(avctx);
}
#if CONFIG_MPEG2_D3D12VA_HWACCEL
const FFHWAccel ff_mpeg2_d3d12va_hwaccel = {
.p.name = "mpeg2_d3d12va",
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MPEG2VIDEO,
.p.pix_fmt = AV_PIX_FMT_D3D12,
.init = d3d12va_mpeg2_decode_init,
.uninit = ff_d3d12va_decode_uninit,
.start_frame = d3d12va_mpeg2_start_frame,
.decode_slice = d3d12va_mpeg2_decode_slice,
.end_frame = d3d12va_mpeg2_end_frame,
.frame_params = ff_d3d12va_common_frame_params,
.frame_priv_data_size = sizeof(D3D12DecodePictureContext),
.priv_data_size = sizeof(D3D12VADecodeContext),
};
#endif
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