avcodec: add D3D12VA hardware accelerated HEVC decoding

The command below is how to enable d3d12va:
ffmpeg -hwaccel d3d12va -i input.mp4 output.mp4

Signed-off-by: Wu Jianhua <toqsxw@outlook.com>
Signed-off-by: Tong Wu <tong1.wu@intel.com>

1 files changed, 208 insertions, 0 deletions

diff --git a/libavcodec/d3d12va_hevc.c b/libavcodec/d3d12va_hevc.c
new file mode 100644
index 0000000000..6537e46065
--- /dev/null
+++ b/libavcodec/d3d12va_hevc.c
@@ -0,0 +1,208 @@
+/*
+ * Direct3D 12 HEVC 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 "hevc_data.h"
+#include "hevcdec.h"
+#include "dxva2_internal.h"
+#include "d3d12va_decode.h"
+#include <dxva.h>
+
+#define MAX_SLICES 256
+
+typedef struct HEVCDecodePictureContext {
+    DXVA_PicParams_HEVC    pp;
+    DXVA_Qmatrix_HEVC      qm;
+    unsigned               slice_count;
+    DXVA_Slice_HEVC_Short  slice_short[MAX_SLICES];
+    const uint8_t         *bitstream;
+    unsigned               bitstream_size;
+} HEVCDecodePictureContext;
+
+static void fill_slice_short(DXVA_Slice_HEVC_Short *slice, unsigned position, unsigned size)
+{
+    memset(slice, 0, sizeof(*slice));
+    slice->BSNALunitDataLocation = position;
+    slice->SliceBytesInBuffer    = size;
+    slice->wBadSliceChopping     = 0;
+}
+
+static int d3d12va_hevc_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
+{
+    const HEVCContext        *h       = avctx->priv_data;
+    D3D12VADecodeContext     *ctx     = D3D12VA_DECODE_CONTEXT(avctx);
+    HEVCDecodePictureContext *ctx_pic = h->ref->hwaccel_picture_private;
+
+    if (!ctx)
+        return -1;
+
+    av_assert0(ctx_pic);
+
+    ctx->used_mask = 0;
+
+    ff_dxva2_hevc_fill_picture_parameters(avctx, (AVDXVAContext *)ctx, &ctx_pic->pp);
+
+    ff_dxva2_hevc_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_hevc_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
+{
+    const HEVCContext        *h               = avctx->priv_data;
+    const HEVCFrame          *current_picture = h->ref;
+    HEVCDecodePictureContext *ctx_pic         = current_picture->hwaccel_picture_private;
+    unsigned position;
+
+    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++;
+
+    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 HEVCContext        *h               = avctx->priv_data;
+    const HEVCFrame          *current_picture = h->ref;
+    HEVCDecodePictureContext *ctx_pic         = current_picture->hwaccel_picture_private;
+
+    int i;
+    uint8_t *mapped_data, *mapped_ptr;
+    DXVA_Slice_HEVC_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_HEVC_Short) * ctx_pic->slice_count;
+    args->pData = ctx_pic->slice_short;
+
+    return 0;
+}
+
+static int d3d12va_hevc_end_frame(AVCodecContext *avctx)
+{
+    HEVCContext              *h       = avctx->priv_data;
+    HEVCDecodePictureContext *ctx_pic = h->ref->hwaccel_picture_private;
+
+    int scale = ctx_pic->pp.dwCodingParamToolFlags & 1;
+
+    if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
+        return -1;
+
+    return ff_d3d12va_common_end_frame(avctx, h->ref->frame, &ctx_pic->pp, sizeof(ctx_pic->pp),
+               scale ? &ctx_pic->qm : NULL, scale ? sizeof(ctx_pic->qm) : 0, update_input_arguments);
+}
+
+static int d3d12va_hevc_decode_init(AVCodecContext *avctx)
+{
+    HEVCContext          *h   = avctx->priv_data;
+    D3D12VADecodeContext *ctx = D3D12VA_DECODE_CONTEXT(avctx);
+    DXVA_PicParams_HEVC pp;
+
+    switch (avctx->profile) {
+    case FF_PROFILE_HEVC_MAIN_10:
+        ctx->cfg.DecodeProfile = D3D12_VIDEO_DECODE_PROFILE_HEVC_MAIN10;
+        break;
+
+    case FF_PROFILE_HEVC_MAIN_STILL_PICTURE:
+        av_log(avctx, AV_LOG_ERROR, "D3D12 doesn't support PROFILE_HEVC_MAIN_STILL_PICTURE!\n");
+        return AVERROR(EINVAL);
+
+    case FF_PROFILE_HEVC_MAIN:
+    default:
+        ctx->cfg.DecodeProfile = D3D12_VIDEO_DECODE_PROFILE_HEVC_MAIN;
+        break;
+    };
+
+    ctx->max_num_ref = FF_ARRAY_ELEMS(pp.RefPicList) + 1;
+
+    return ff_d3d12va_decode_init(avctx);
+}
+
+#if CONFIG_HEVC_D3D12VA_HWACCEL
+const FFHWAccel ff_hevc_d3d12va_hwaccel = {
+    .p.name               = "hevc_d3d12va",
+    .p.type               = AVMEDIA_TYPE_VIDEO,
+    .p.id                 = AV_CODEC_ID_HEVC,
+    .p.pix_fmt            = AV_PIX_FMT_D3D12,
+    .init                 = d3d12va_hevc_decode_init,
+    .uninit               = ff_d3d12va_decode_uninit,
+    .start_frame          = d3d12va_hevc_start_frame,
+    .decode_slice         = d3d12va_hevc_decode_slice,
+    .end_frame            = d3d12va_hevc_end_frame,
+    .frame_params         = ff_d3d12va_common_frame_params,
+    .frame_priv_data_size = sizeof(HEVCDecodePictureContext),
+    .priv_data_size       = sizeof(D3D12VADecodeContext),
+};
+#endif