text: /*
   * MPEG-4 Part 2 / H.263 decode acceleration through VDPAU
   *
   * Copyright (c) 2008 NVIDIA
   * Copyright (c) 2013 Rémi Denis-Courmont
   *
   * 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 <vdpau/vdpau.h>
  
  #include "avcodec.h"
  #include "mpeg4video.h"
  #include "vdpau.h"
  #include "vdpau_internal.h"
  
  static int vdpau_mpeg4_start_frame(AVCodecContext *avctx,
                                     const uint8_t *buffer, uint32_t size)
  {
      Mpeg4DecContext *ctx = avctx->priv_data;
      MpegEncContext * const s = &ctx->m;
      Picture *pic             = s->current_picture_ptr;
      struct vdpau_picture_context *pic_ctx = pic->hwaccel_picture_private;
      VdpPictureInfoMPEG4Part2 *info = &pic_ctx->info.mpeg4;
      VdpVideoSurface ref;
      int i;
  
      /* fill VdpPictureInfoMPEG4Part2 struct */
      info->forward_reference  = VDP_INVALID_HANDLE;
      info->backward_reference = VDP_INVALID_HANDLE;
      info->vop_coding_type    = 0;
  
      switch (s->pict_type) {
      case AV_PICTURE_TYPE_B:
          ref = ff_vdpau_get_surface_id(s->next_picture.f);
          assert(ref != VDP_INVALID_HANDLE);
          info->backward_reference = ref;
          info->vop_coding_type    = 2;
          /* fall-through */
      case AV_PICTURE_TYPE_P:
          ref = ff_vdpau_get_surface_id(s->last_picture.f);
          assert(ref != VDP_INVALID_HANDLE);
          info->forward_reference  = ref;
      }
  
      info->trd[0]                            = s->pp_time;
      info->trb[0]                            = s->pb_time;
      info->trd[1]                            = s->pp_field_time >> 1;
      info->trb[1]                            = s->pb_field_time >> 1;
      info->vop_time_increment_resolution     = s->avctx->framerate.num;
      info->vop_fcode_forward                 = s->f_code;
      info->vop_fcode_backward                = s->b_code;
      info->resync_marker_disable             = !ctx->resync_marker;
      info->interlaced                        = !s->progressive_sequence;
      info->quant_type                        = s->mpeg_quant;
      info->quarter_sample                    = s->quarter_sample;
      info->short_video_header                = avctx->codec->id == AV_CODEC_ID_H263;
      info->rounding_control                  = s->no_rounding;
      info->alternate_vertical_scan_flag      = s->alternate_scan;
      info->top_field_first                   = s->top_field_first;
      for (i = 0; i < 64; ++i) {
          info->intra_quantizer_matrix[i]     = s->intra_matrix[i];
          info->non_intra_quantizer_matrix[i] = s->inter_matrix[i];
      }
  
      ff_vdpau_common_start_frame(pic_ctx, buffer, size);
      return ff_vdpau_add_buffer(pic_ctx, buffer, size);
  }
  
  static int vdpau_mpeg4_decode_slice(av_unused AVCodecContext *avctx,
                                      av_unused const uint8_t *buffer,
                                      av_unused uint32_t size)
  {
       return 0;
  }
  
  #if CONFIG_H263_VDPAU_HWACCEL
  static int vdpau_h263_init(AVCodecContext *avctx)
  {
      return ff_vdpau_common_init(avctx, VDP_DECODER_PROFILE_MPEG4_PART2_ASP,
                                  VDP_DECODER_LEVEL_MPEG4_PART2_ASP_L5);
  }
  
  AVHWAccel ff_h263_vdpau_hwaccel = {
      .name           = "h263_vdpau",
      .type           = AVMEDIA_TYPE_VIDEO,
      .id             = AV_CODEC_ID_H263,
      .pix_fmt        = AV_PIX_FMT_VDPAU,
      .start_frame    = vdpau_mpeg4_start_frame,
      .end_frame      = ff_vdpau_mpeg_end_frame,
      .decode_slice   = vdpau_mpeg4_decode_slice,
      .frame_priv_data_size = sizeof(struct vdpau_picture_context),
      .init           = vdpau_h263_init,
      .uninit         = ff_vdpau_common_uninit,
      .priv_data_size = sizeof(VDPAUContext),
  };
  #endif
  
  #if CONFIG_MPEG4_VDPAU_HWACCEL
  static int vdpau_mpeg4_init(AVCodecContext *avctx)
  {
      VdpDecoderProfile profile;
  
      switch (avctx->profile) {
      case FF_PROFILE_MPEG4_SIMPLE:
          profile = VDP_DECODER_PROFILE_MPEG4_PART2_SP;
          break;
      // As any ASP decoder must be able to decode SP, this
      // should be a safe fallback if profile is unknown/unspecified.
      case FF_PROFILE_UNKNOWN:
      case FF_PROFILE_MPEG4_ADVANCED_SIMPLE:
          profile = VDP_DECODER_PROFILE_MPEG4_PART2_ASP;
          break;
      default:
          return AVERROR(ENOTSUP);
      }
  
      return ff_vdpau_common_init(avctx, profile, avctx->level);
  }
  
  AVHWAccel ff_mpeg4_vdpau_hwaccel = {
      .name           = "mpeg4_vdpau",
      .type           = AVMEDIA_TYPE_VIDEO,
      .id             = AV_CODEC_ID_MPEG4,
      .pix_fmt        = AV_PIX_FMT_VDPAU,
      .start_frame    = vdpau_mpeg4_start_frame,
      .end_frame      = ff_vdpau_mpeg_end_frame,
      .decode_slice   = vdpau_mpeg4_decode_slice,
      .frame_priv_data_size = sizeof(struct vdpau_picture_context),
      .init           = vdpau_mpeg4_init,
      .uninit         = ff_vdpau_common_uninit,
      .priv_data_size = sizeof(VDPAUContext),
  };
  #endif
  