ffmpeg_utils.h

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/*
 * 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
 */
 
#ifndef FFTOOLS_FFMPEG_UTILS_H
#define FFTOOLS_FFMPEG_UTILS_H
 
#include <stdint.h>
 
#include "libavutil/common.h"
#include "libavutil/frame.h"
#include "libavutil/rational.h"
 
#include "libavcodec/packet.h"
 
typedef struct Timestamp {
    int64_t    ts;
    AVRational tb;
} Timestamp;
 
/**
 * Merge two return codes - return one of the error codes if at least one of
 * them was negative, 0 otherwise.
 */
static inline int err_merge(int err0, int err1)
{
    // prefer "real" errors over EOF
    if ((err0 >= 0 || err0 == AVERROR_EOF) && err1 < 0)
        return err1;
    return (err0 < 0) ? err0 : FFMIN(err1, 0);
}
 
/**
 * Wrapper calling av_frame_side_data_clone() in a loop for all source entries.
 * It does not clear dst beforehand. */
static inline int clone_side_data(AVFrameSideData ***dst, int *nb_dst,
                                  AVFrameSideData * const *src, int nb_src,
                                  unsigned int flags)
{
    for (int i = 0; i < nb_src; i++) {
        int ret = av_frame_side_data_clone(dst, nb_dst, src[i], flags);
        if (ret < 0)
            return ret;
    }
 
    return 0;
}
 
#endif // FFTOOLS_FFMPEG_UTILS_H