/*
  * Chinese AVS video (AVS1-P2, JiZhun profile) parser.
  * Copyright (c) 2006  Stefan Gehrer <stefan.gehrer@gmx.de>
  *
  * 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

  */
 
 /**

  * @file

  * Chinese AVS video (AVS1-P2, JiZhun profile) parser
  * @author Stefan Gehrer <stefan.gehrer@gmx.de>
  */
 
 #include "parser.h"
 #include "cavs.h"
 
 
 /**

  * Find the end of the current frame in the bitstream.

  * @return the position of the first byte of the next frame, or -1
  */
 static int cavs_find_frame_end(ParseContext *pc, const uint8_t *buf,
                                int buf_size) {
     int pic_found, i;
     uint32_t state;
 
     pic_found= pc->frame_start_found;
     state= pc->state;
 
     i=0;
     if(!pic_found){
         for(i=0; i<buf_size; i++){
             state= (state<<8) | buf[i];
             if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){
                 i++;
                 pic_found=1;
                 break;
             }
         }
     }
 
     if(pic_found){
         /* EOF considered as end of frame */
         if (buf_size == 0)
             return 0;
         for(; i<buf_size; i++){
             state= (state<<8) | buf[i];
             if((state&0xFFFFFF00) == 0x100){

                 if(state > SLICE_MAX_START_CODE){

                     pc->frame_start_found=0;
                     pc->state=-1;
                     return i-3;
                 }
             }
         }
     }
     pc->frame_start_found= pic_found;
     pc->state= state;
     return END_NOT_FOUND;
 }
 
 static int cavsvideo_parse(AVCodecParserContext *s,
                            AVCodecContext *avctx,
                            const uint8_t **poutbuf, int *poutbuf_size,
                            const uint8_t *buf, int buf_size)
 {
     ParseContext *pc = s->priv_data;
     int next;
 
     if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
         next= buf_size;
     }else{
         next= cavs_find_frame_end(pc, buf, buf_size);
 
         if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
             *poutbuf = NULL;
             *poutbuf_size = 0;
             return buf_size;
         }
     }
     *poutbuf = buf;
     *poutbuf_size = buf_size;
     return next;
 }
 

 AVCodecParser ff_cavsvideo_parser = {

     .codec_ids      = { CODEC_ID_CAVS },
     .priv_data_size = sizeof(ParseContext1),
     .parser_parse   = cavsvideo_parse,
     .parser_close   = ff_parse1_close,
     .split          = ff_mpeg4video_split,

 };