GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/canopus.c Lines: 16 17 94.1 %
Date: 2019-11-18 18:00:01 Branches: 6 10 60.0 %

Line Branch Exec Source
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/*
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 * Canopus common routines
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 * Copyright (c) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <stdint.h>
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#include "libavutil/rational.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "canopus.h"
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int ff_canopus_parse_info_tag(AVCodecContext *avctx,
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                              const uint8_t *src, size_t size)
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{
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    GetByteContext gbc;
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    int par_x, par_y, field_order;
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    bytestream2_init(&gbc, src, size);
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    /* Parse aspect ratio. */
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    bytestream2_skip(&gbc, 8); // unknown, 16 bits 1
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    par_x = bytestream2_get_le32(&gbc);
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    par_y = bytestream2_get_le32(&gbc);
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    if (par_x && par_y)
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        av_reduce(&avctx->sample_aspect_ratio.num,
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                  &avctx->sample_aspect_ratio.den,
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                  par_x, par_y, 255);
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    /* Short INFO tag (used in CLLC) has only AR data. */
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    if (size == 0x18)
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        return 0;
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    bytestream2_skip(&gbc, 16); // unknown RDRT tag
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    /* Parse FIEL tag. */
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    bytestream2_skip(&gbc, 8); // 'FIEL' and 4 bytes 0
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    field_order = bytestream2_get_le32(&gbc);
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    switch (field_order) {
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2
    case 0: avctx->field_order = AV_FIELD_TT; break;
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    case 1: avctx->field_order = AV_FIELD_BB; break;
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    case 2: avctx->field_order = AV_FIELD_PROGRESSIVE; break;
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    }
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    return 0;
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}