/*
  * 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 "hwaccel.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;
 }
 

 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);
 }
 

 const 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,

     .frame_params   = ff_vdpau_common_frame_params,

     .priv_data_size = sizeof(VDPAUContext),

     .caps_internal  = HWACCEL_CAP_ASYNC_SAFE,

 };