/*
  * MPEG-1/2 HW 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 "vdpau.h"
 #include "vdpau_internal.h"
 
 static int vdpau_mpeg_start_frame(AVCodecContext *avctx,
                                   const uint8_t *buffer, uint32_t size)
 {
     MpegEncContext * const s = avctx->priv_data;
     AVVDPAUContext *hwctx    = avctx->hwaccel_context;
     VdpPictureInfoMPEG1Or2 *info = &hwctx->info.mpeg;
     VdpVideoSurface ref;
     int i;
 
     /* fill VdpPictureInfoMPEG1Or2 struct */
     info->forward_reference  = VDP_INVALID_HANDLE;
     info->backward_reference = VDP_INVALID_HANDLE;
 
     switch (s->pict_type) {
     case AV_PICTURE_TYPE_B:
         ref = ff_vdpau_get_surface_id(&s->next_picture);
         assert(ref != VDP_INVALID_HANDLE);
         hwctx->info.mpeg.backward_reference = ref;
         /* fall through to forward prediction */
     case AV_PICTURE_TYPE_P:
         ref = ff_vdpau_get_surface_id(&s->last_picture);
         hwctx->info.mpeg.forward_reference  = ref;
     }
 
     info->slice_count                = 0;
     info->picture_structure          = s->picture_structure;
     info->picture_coding_type        = s->pict_type;
     info->intra_dc_precision         = s->intra_dc_precision;
     info->frame_pred_frame_dct       = s->frame_pred_frame_dct;
     info->concealment_motion_vectors = s->concealment_motion_vectors;
     info->intra_vlc_format           = s->intra_vlc_format;
     info->alternate_scan             = s->alternate_scan;
     info->q_scale_type               = s->q_scale_type;
     info->top_field_first            = s->top_field_first;
     // Both for MPEG-1 only, zero for MPEG-2:
     info->full_pel_forward_vector    = s->full_pel[0];
     info->full_pel_backward_vector   = s->full_pel[1];
     // For MPEG-1 fill both horizontal & vertical:
     info->f_code[0][0]               = s->mpeg_f_code[0][0];
     info->f_code[0][1]               = s->mpeg_f_code[0][1];
     info->f_code[1][0]               = s->mpeg_f_code[1][0];
     info->f_code[1][1]               = s->mpeg_f_code[1][1];
     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];
     }
 
     return ff_vdpau_common_start_frame(avctx, buffer, size);
 }
 
 static int vdpau_mpeg_decode_slice(AVCodecContext *avctx,
                                    const uint8_t *buffer, uint32_t size)
 {
     AVVDPAUContext *hwctx = avctx->hwaccel_context;
     int val;
 
     val = ff_vdpau_add_buffer(avctx, buffer, size);
     if (val < 0)
         return val;
 
     hwctx->info.mpeg.slice_count++;
     return 0;
 }
 
 #if CONFIG_MPEG1_VDPAU_HWACCEL
 AVHWAccel ff_mpeg1_vdpau_hwaccel = {
     .name           = "mpeg1_vdpau",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_MPEG1VIDEO,
     .pix_fmt        = AV_PIX_FMT_VDPAU,
     .start_frame    = vdpau_mpeg_start_frame,

     .end_frame      = ff_vdpau_mpeg_end_frame,

     .decode_slice   = vdpau_mpeg_decode_slice,
 };
 #endif
 
 #if CONFIG_MPEG2_VDPAU_HWACCEL
 AVHWAccel ff_mpeg2_vdpau_hwaccel = {
     .name           = "mpeg2_vdpau",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_MPEG2VIDEO,
     .pix_fmt        = AV_PIX_FMT_VDPAU,
     .start_frame    = vdpau_mpeg_start_frame,

     .end_frame      = ff_vdpau_mpeg_end_frame,

     .decode_slice   = vdpau_mpeg_decode_slice,
 };
 #endif