Function av_packet_make_writable

libavcodec/packet.c:514–534

}

int av_packet_make_writable(AVPacket *pkt)
{
    AVBufferRef *buf = NULL;
    int ret;

    if (pkt->buf && av_buffer_is_writable(pkt->buf))
        return 0;

    ret = packet_alloc(&buf, pkt->size);
    if (ret < 0)
        return ret;
    av_assert1(!pkt->size || pkt->data);
    if (pkt->size)
        memcpy(buf->data, pkt->data, pkt->size);

    av_buffer_unref(&pkt->buf);
    pkt->buf  = buf;
    pkt->data = buf->data;

    return 0;
}

void av_packet_rescale_ts(AVPacket *pkt, AVRational src_tb, AVRational dst_tb)
{