LCOV - code coverage report
Current view: top level - libavcodec - dpx_parser.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 44 47 93.6 %
Date: 2017-12-17 16:07:53 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * DPX parser
       3             :  * Copyright (c) 2013 Paul B Mahol
       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             :  * DPX parser
      25             :  */
      26             : 
      27             : #include "libavutil/bswap.h"
      28             : #include "libavutil/common.h"
      29             : 
      30             : #include "parser.h"
      31             : 
      32             : typedef struct DPXParseContext {
      33             :     ParseContext pc;
      34             :     uint32_t index;
      35             :     uint32_t fsize;
      36             :     uint32_t remaining_size;
      37             :     int is_be;
      38             : } DPXParseContext;
      39             : 
      40         639 : static int dpx_parse(AVCodecParserContext *s, AVCodecContext *avctx,
      41             :                      const uint8_t **poutbuf, int *poutbuf_size,
      42             :                      const uint8_t *buf, int buf_size)
      43             : {
      44         639 :     DPXParseContext *d = s->priv_data;
      45         639 :     uint32_t state = d->pc.state;
      46         639 :     int next = END_NOT_FOUND;
      47         639 :     int i = 0;
      48             : 
      49         639 :     s->pict_type = AV_PICTURE_TYPE_I;
      50             : 
      51         639 :     *poutbuf_size = 0;
      52         639 :     if (buf_size == 0)
      53           4 :         next = 0;
      54             : 
      55         639 :     if (!d->pc.frame_start_found) {
      56          22 :         for (; i < buf_size; i++) {
      57          20 :             state = (state << 8) | buf[i];
      58          20 :             if (state == MKBETAG('S','D','P','X') ||
      59             :                 state == MKTAG('S','D','P','X')) {
      60           5 :                 d->pc.frame_start_found = 1;
      61           5 :                 d->is_be = state == MKBETAG('S','D','P','X');
      62           5 :                 d->index = 0;
      63           5 :                 break;
      64             :             }
      65             :         }
      66           7 :         d->pc.state = state;
      67             :     } else {
      68         632 :         if (d->remaining_size) {
      69         438 :             i = FFMIN(d->remaining_size, buf_size);
      70         438 :             d->remaining_size -= i;
      71         438 :             if (d->remaining_size)
      72         433 :                 goto flush;
      73             :         }
      74             :     }
      75             : 
      76     1573452 :     for (; d->pc.frame_start_found && i < buf_size; i++) {
      77      786529 :         d->pc.state = (d->pc.state << 8) | buf[i];
      78      786529 :         d->index++;
      79      786529 :         if (d->index == 17) {
      80           5 :             d->fsize = d->is_be ? d->pc.state : av_bswap32(d->pc.state);
      81           5 :             if (d->fsize <= 1664) {
      82           0 :                 d->pc.frame_start_found = 0;
      83           0 :                 goto flush;
      84             :             }
      85           5 :             if (d->fsize > buf_size - i + 19)
      86           5 :                 d->remaining_size = d->fsize - buf_size + i - 19;
      87             :             else
      88           0 :                 i += d->fsize - 19;
      89             : 
      90           5 :             break;
      91      786524 :         } else if (d->index > 17) {
      92     1572888 :             if (d->pc.state == MKBETAG('S','D','P','X') ||
      93      786444 :                 d->pc.state == MKTAG('S','D','P','X')) {
      94           3 :                 next = i - 3;
      95           3 :                 break;
      96             :             }
      97             :         }
      98             :     }
      99             : 
     100         198 : flush:
     101         639 :     if (ff_combine_frame(&d->pc, next, &buf, &buf_size) < 0)
     102         632 :         return buf_size;
     103             : 
     104           7 :     d->pc.frame_start_found = 0;
     105             : 
     106           7 :     *poutbuf      = buf;
     107           7 :     *poutbuf_size = buf_size;
     108           7 :     return next;
     109             : }
     110             : 
     111             : AVCodecParser ff_dpx_parser = {
     112             :     .codec_ids      = { AV_CODEC_ID_DPX },
     113             :     .priv_data_size = sizeof(DPXParseContext),
     114             :     .parser_parse   = dpx_parse,
     115             :     .parser_close   = ff_parse_close,
     116             : };

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