/*
  * VDA H264 HW acceleration.
  *
  * copyright (c) 2011 Sebastien Zwickert
  *
  * 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 "h264.h"

 #include "vda_internal.h"
 
 static int start_frame(AVCodecContext *avctx,
                        av_unused const uint8_t *buffer,
                        av_unused uint32_t size)
 {
     struct vda_context *vda_ctx = avctx->hwaccel_context;
 
     if (!vda_ctx->decoder)
         return -1;
 

     vda_ctx->bitstream_size = 0;

 
     return 0;
 }
 
 static int decode_slice(AVCodecContext *avctx,
                         const uint8_t *buffer,
                         uint32_t size)
 {
     struct vda_context *vda_ctx = avctx->hwaccel_context;
     void *tmp;
 
     if (!vda_ctx->decoder)
         return -1;
 

     tmp = av_fast_realloc(vda_ctx->bitstream, &vda_ctx->ref_size, vda_ctx->bitstream_size+size+4);

     if (!tmp)
         return AVERROR(ENOMEM);
 

     vda_ctx->bitstream = tmp;

     AV_WB32(vda_ctx->bitstream+vda_ctx->bitstream_size, size);
     memcpy(vda_ctx->bitstream+vda_ctx->bitstream_size+4, buffer, size);

     vda_ctx->bitstream_size += size + 4;

 
     return 0;
 }
 
 static int end_frame(AVCodecContext *avctx)
 {
     H264Context *h = avctx->priv_data;
     struct vda_context *vda_ctx = avctx->hwaccel_context;

     AVFrame *frame = &h->s.current_picture_ptr->f;

     int status;
 

     if (!vda_ctx->decoder || !vda_ctx->bitstream)

         return -1;
 

     status = ff_vda_decoder_decode(vda_ctx, vda_ctx->bitstream,
                                    vda_ctx->bitstream_size,

                                    frame->reordered_opaque);
 
     if (status)
         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
 
     return status;
 }
 
 AVHWAccel ff_h264_vda_hwaccel = {
     .name           = "h264_vda",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_H264,
     .pix_fmt        = PIX_FMT_VDA_VLD,
     .start_frame    = start_frame,
     .decode_slice   = decode_slice,
     .end_frame      = end_frame,

     .priv_data_size = 0,

 };