/*
  * 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/intreadwrite.h"
 
 #include "avcodec.h"

 
 static int parse(AVCodecParserContext *s,

                  AVCodecContext *avctx,
                  const uint8_t **poutbuf, int *poutbuf_size,
                  const uint8_t *buf, int buf_size)

 {

     unsigned int frame_type;
     unsigned int profile;
 
     if (buf_size < 3)

         return buf_size;

 
     frame_type = buf[0] & 1;
     profile    = (buf[0] >> 1) & 7;
     if (profile > 3) {
         av_log(avctx, AV_LOG_ERROR, "Invalid profile %u.\n", profile);

         return buf_size;

     }
 
     avctx->profile = profile;
     s->key_frame   = frame_type == 0;
     s->pict_type   = frame_type ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
     s->format      = AV_PIX_FMT_YUV420P;
     s->field_order = AV_FIELD_PROGRESSIVE;
     s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
 
     if (frame_type == 0) {
         unsigned int sync_code;
         unsigned int width, height;
 
         if (buf_size < 10)

             return buf_size;

 
         sync_code = AV_RL24(buf + 3);
         if (sync_code != 0x2a019d) {
             av_log(avctx, AV_LOG_ERROR, "Invalid sync code %06x.\n", sync_code);

             return buf_size;

         }
 
         width  = AV_RL16(buf + 6) & 0x3fff;
         height = AV_RL16(buf + 8) & 0x3fff;
 
         s->width        = width;
         s->height       = height;
         s->coded_width  = FFALIGN(width,  16);
         s->coded_height = FFALIGN(height, 16);
     }

     *poutbuf      = buf;

     *poutbuf_size = buf_size;
     return buf_size;
 }
 

 AVCodecParser ff_vp8_parser = {

     .codec_ids    = { AV_CODEC_ID_VP8 },
     .parser_parse = parse,

 };