| /* |
| * 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 |