LCOV - code coverage report
Current view: top level - libavcodec - h263_parser.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 7 33 21.2 %
Date: 2017-12-14 08:27:08 Functions: 1 2 50.0 %

          Line data    Source code
       1             : /*
       2             :  * H.263 parser
       3             :  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * H.263 parser
      25             :  */
      26             : 
      27             : #include "parser.h"
      28             : #include "h263_parser.h"
      29             : 
      30           0 : int ff_h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
      31             :     int vop_found, i;
      32             :     uint32_t state;
      33             : 
      34           0 :     vop_found= pc->frame_start_found;
      35           0 :     state= pc->state;
      36             : 
      37           0 :     i=0;
      38           0 :     if(!vop_found){
      39           0 :         for(i=0; i<buf_size; i++){
      40           0 :             state= (state<<8) | buf[i];
      41           0 :             if(state>>(32-22) == 0x20){
      42           0 :                 i++;
      43           0 :                 vop_found=1;
      44           0 :                 break;
      45             :             }
      46             :         }
      47             :     }
      48             : 
      49           0 :     if(vop_found){
      50           0 :       for(; i<buf_size; i++){
      51           0 :         state= (state<<8) | buf[i];
      52           0 :         if(state>>(32-22) == 0x20){
      53           0 :             pc->frame_start_found=0;
      54           0 :             pc->state=-1;
      55           0 :             return i-3;
      56             :         }
      57             :       }
      58             :     }
      59           0 :     pc->frame_start_found= vop_found;
      60           0 :     pc->state= state;
      61             : 
      62           0 :     return END_NOT_FOUND;
      63             : }
      64             : 
      65         511 : static int h263_parse(AVCodecParserContext *s,
      66             :                            AVCodecContext *avctx,
      67             :                            const uint8_t **poutbuf, int *poutbuf_size,
      68             :                            const uint8_t *buf, int buf_size)
      69             : {
      70         511 :     ParseContext *pc = s->priv_data;
      71             :     int next;
      72             : 
      73         511 :     if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
      74         511 :         next = buf_size;
      75             :     } else {
      76           0 :         next= ff_h263_find_frame_end(pc, buf, buf_size);
      77             : 
      78           0 :         if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
      79           0 :             *poutbuf = NULL;
      80           0 :             *poutbuf_size = 0;
      81           0 :             return buf_size;
      82             :         }
      83             :     }
      84             : 
      85         511 :     *poutbuf = buf;
      86         511 :     *poutbuf_size = buf_size;
      87         511 :     return next;
      88             : }
      89             : 
      90             : AVCodecParser ff_h263_parser = {
      91             :     .codec_ids      = { AV_CODEC_ID_H263 },
      92             :     .priv_data_size = sizeof(ParseContext),
      93             :     .parser_parse   = h263_parse,
      94             :     .parser_close   = ff_parse_close,
      95             : };

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