LCOV - code coverage report
Current view: top level - libavcodec - canopus.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 16 17 94.1 %
Date: 2017-12-14 08:27:08 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Canopus common routines
       3             :  * Copyright (c) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
       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             : #include <stdint.h>
      23             : 
      24             : #include "libavutil/rational.h"
      25             : 
      26             : #include "avcodec.h"
      27             : #include "bytestream.h"
      28             : #include "canopus.h"
      29             : 
      30          56 : int ff_canopus_parse_info_tag(AVCodecContext *avctx,
      31             :                               const uint8_t *src, size_t size)
      32             : {
      33             :     GetByteContext gbc;
      34             :     int par_x, par_y, field_order;
      35             : 
      36          56 :     bytestream2_init(&gbc, src, size);
      37             : 
      38             :     /* Parse aspect ratio. */
      39          56 :     bytestream2_skip(&gbc, 8); // unknown, 16 bits 1
      40          56 :     par_x = bytestream2_get_le32(&gbc);
      41          56 :     par_y = bytestream2_get_le32(&gbc);
      42          56 :     if (par_x && par_y)
      43          56 :         av_reduce(&avctx->sample_aspect_ratio.num,
      44             :                   &avctx->sample_aspect_ratio.den,
      45             :                   par_x, par_y, 255);
      46             : 
      47             :     /* Short INFO tag (used in CLLC) has only AR data. */
      48          56 :     if (size == 0x18)
      49          39 :         return 0;
      50             : 
      51          17 :     bytestream2_skip(&gbc, 16); // unknown RDRT tag
      52             : 
      53             :     /* Parse FIEL tag. */
      54          17 :     bytestream2_skip(&gbc, 8); // 'FIEL' and 4 bytes 0
      55          17 :     field_order = bytestream2_get_le32(&gbc);
      56          17 :     switch (field_order) {
      57           2 :     case 0: avctx->field_order = AV_FIELD_TT; break;
      58           0 :     case 1: avctx->field_order = AV_FIELD_BB; break;
      59          15 :     case 2: avctx->field_order = AV_FIELD_PROGRESSIVE; break;
      60             :     }
      61             : 
      62          17 :     return 0;
      63             : }

Generated by: LCOV version 1.13