av_read_frame 阻塞,基于回调的解决办法

设置回调，每次 av_read_frame 前刷新时间

static int InterruptFouction(void *theTimeSpec)
{
    
    if (!theTimeSpec) {
    
        return 0;
    }

    std::cout << "InterruptFouction called~!" << std::endl;
    time_t mtime;
    time(&mtime);
    time_t *t = (time_t*)theTimeSpec;
    if( ( mtime - *t ) > 5) {
    
        return 1;
    }
    return 0;
}

time_t TimeNow;
m_pFmtCtx->interrupt_callback.callback = InterruptFouction;
m_pFmtCtx->interrupt_callback.opaque = &TimeNow;

while(isRunning){
    
	time(&TimeNow);
	ret = av_read_frame(m_pFmtCtx, m_pAVPacket);
	if ( ret == 0 ) {
    
		// to do something
	} else {
    
		break;
	}
}