/*
  * VP9 HW decode acceleration through NVDEC
  *
  * Copyright (c) 2016 Timo Rothenpieler
  *
  * 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 "libavutil/pixdesc.h"
 
 #include "avcodec.h"
 #include "nvdec.h"
 #include "decode.h"
 #include "internal.h"
 #include "vp9shared.h"
 
 static int nvdec_vp9_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
 {
     VP9SharedContext *h = avctx->priv_data;
     const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(avctx->sw_pix_fmt);
 
     NVDECContext      *ctx = avctx->internal->hwaccel_priv_data;
     CUVIDPICPARAMS     *pp = &ctx->pic_params;
     CUVIDVP9PICPARAMS *ppc = &pp->CodecSpecific.vp9;
     FrameDecodeData *fdd;
     NVDECFrame *cf;
     AVFrame *cur_frame = h->frames[CUR_FRAME].tf.f;
 
     int ret, i;
 
     ret = ff_nvdec_start_frame(avctx, cur_frame);
     if (ret < 0)
         return ret;
 
     fdd = (FrameDecodeData*)cur_frame->private_ref->data;
     cf  = (NVDECFrame*)fdd->hwaccel_priv;
 
     *pp = (CUVIDPICPARAMS) {
         .PicWidthInMbs     = (cur_frame->width  + 15) / 16,
         .FrameHeightInMbs  = (cur_frame->height + 15) / 16,
         .CurrPicIdx        = cf->idx,
 
         .CodecSpecific.vp9 = {
             .width                    = cur_frame->width,
             .height                   = cur_frame->height,
 

             .LastRefIdx               = ff_nvdec_get_ref_idx(h->refs[h->h.refidx[0]].f),
             .GoldenRefIdx             = ff_nvdec_get_ref_idx(h->refs[h->h.refidx[1]].f),
             .AltRefIdx                = ff_nvdec_get_ref_idx(h->refs[h->h.refidx[2]].f),

 
             .profile                  = h->h.profile,
             .frameContextIdx          = h->h.framectxid,
             .frameType                = !h->h.keyframe,
             .showFrame                = !h->h.invisible,
             .errorResilient           = h->h.errorres,
             .frameParallelDecoding    = h->h.parallelmode,
             .subSamplingX             = pixdesc->log2_chroma_w,
             .subSamplingY             = pixdesc->log2_chroma_h,
             .intraOnly                = h->h.intraonly,
             .allow_high_precision_mv  = h->h.keyframe ? 0 : h->h.highprecisionmvs,
             .refreshEntropyProbs      = h->h.refreshctx,
 
             .bitDepthMinus8Luma       = pixdesc->comp[0].depth - 8,
             .bitDepthMinus8Chroma     = pixdesc->comp[1].depth - 8,
 
             .loopFilterLevel          = h->h.filter.level,
             .loopFilterSharpness      = h->h.filter.sharpness,
             .modeRefLfEnabled         = h->h.lf_delta.enabled,
 
             .log2_tile_columns        = h->h.tiling.log2_tile_cols,
             .log2_tile_rows           = h->h.tiling.log2_tile_rows,
 
             .segmentEnabled           = h->h.segmentation.enabled,
             .segmentMapUpdate         = h->h.segmentation.update_map,
             .segmentMapTemporalUpdate = h->h.segmentation.temporal,
             .segmentFeatureMode       = h->h.segmentation.absolute_vals,
 
             .qpYAc                    = h->h.yac_qi,
             .qpYDc                    = h->h.ydc_qdelta,
             .qpChDc                   = h->h.uvdc_qdelta,
             .qpChAc                   = h->h.uvac_qdelta,
 
             .resetFrameContext        = h->h.resetctx,
             .mcomp_filter_type        = h->h.filtermode ^ (h->h.filtermode <= 1),
 
             .frameTagSize             = h->h.uncompressed_header_size,
             .offsetToDctParts         = h->h.compressed_header_size,
 
             .refFrameSignBias[0]      = 0,
         }
     };
 
     for (i = 0; i < 2; i++)
         ppc->mbModeLfDelta[i] = h->h.lf_delta.mode[i];
 
     for (i = 0; i < 4; i++)
         ppc->mbRefLfDelta[i] = h->h.lf_delta.ref[i];
 
     for (i = 0; i < 7; i++)
         ppc->mb_segment_tree_probs[i] = h->h.segmentation.prob[i];
 
     for (i = 0; i < 3; i++) {
         ppc->activeRefIdx[i] = h->h.refidx[i];
         ppc->segment_pred_probs[i] = h->h.segmentation.pred_prob[i];
         ppc->refFrameSignBias[i + 1] = h->h.signbias[i];
     }
 
     for (i = 0; i < 8; i++) {
         ppc->segmentFeatureEnable[i][0] = h->h.segmentation.feat[i].q_enabled;
         ppc->segmentFeatureEnable[i][1] = h->h.segmentation.feat[i].lf_enabled;
         ppc->segmentFeatureEnable[i][2] = h->h.segmentation.feat[i].ref_enabled;
         ppc->segmentFeatureEnable[i][3] = h->h.segmentation.feat[i].skip_enabled;
 
         ppc->segmentFeatureData[i][0] = h->h.segmentation.feat[i].q_val;
         ppc->segmentFeatureData[i][1] = h->h.segmentation.feat[i].lf_val;
         ppc->segmentFeatureData[i][2] = h->h.segmentation.feat[i].ref_val;
         ppc->segmentFeatureData[i][3] = 0;
     }
 
     switch (avctx->colorspace) {
     default:
     case AVCOL_SPC_UNSPECIFIED:
         ppc->colorSpace = 0;
         break;
     case AVCOL_SPC_BT470BG:
         ppc->colorSpace = 1;
         break;
     case AVCOL_SPC_BT709:
         ppc->colorSpace = 2;
         break;
     case AVCOL_SPC_SMPTE170M:
         ppc->colorSpace = 3;
         break;
     case AVCOL_SPC_SMPTE240M:
         ppc->colorSpace = 4;
         break;
     case AVCOL_SPC_BT2020_NCL:
         ppc->colorSpace = 5;
         break;
     case AVCOL_SPC_RESERVED:
         ppc->colorSpace = 6;
         break;
     case AVCOL_SPC_RGB:
         ppc->colorSpace = 7;
         break;
     }
 
     return 0;
 }
 
 static int nvdec_vp9_frame_params(AVCodecContext *avctx,
                                   AVBufferRef *hw_frames_ctx)
 {
     // VP9 uses a fixed size pool of 8 possible reference frames

     return ff_nvdec_frame_params(avctx, hw_frames_ctx, 8, 0);

 }
 

 const AVHWAccel ff_vp9_nvdec_hwaccel = {

     .name                 = "vp9_nvdec",
     .type                 = AVMEDIA_TYPE_VIDEO,
     .id                   = AV_CODEC_ID_VP9,
     .pix_fmt              = AV_PIX_FMT_CUDA,
     .start_frame          = nvdec_vp9_start_frame,

     .end_frame            = ff_nvdec_simple_end_frame,
     .decode_slice         = ff_nvdec_simple_decode_slice,

     .frame_params         = nvdec_vp9_frame_params,
     .init                 = ff_nvdec_decode_init,
     .uninit               = ff_nvdec_decode_uninit,
     .priv_data_size       = sizeof(NVDECContext),
 };