int main(int argc, char **argv)
{
int flags;
VideoState *is;
av_register_all();
flags = SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER;
if (SDL_Init(flags)) {
av_log(NULL, AV_LOG_FATAL, "Could not initialize SDL - %s\n", SDL_GetError());
exit(1);
}
screen = SDL_SetVideoMode(640, 480, 0, 0);
screen_mutex = SDL_CreateMutex();
/* ffplay.c 把下述内容封装到了函数 stream_open() 里 */
is = (VideoState*)av_mallocz(sizeof(VideoState));
av_strlcpy(is->filename, argv[1], sizeof(is->filename));
frame_queue_init(&is->pictq, &is->videoq);
frame_queue_init(&is->sampq, &is->audioq);
packet_queue_init(&is->videoq);
packet_queue_init(&is->audioq);
is->read_tid = SDL_CreateThread(read_thread, is); /* 开启读包线程，里面会再开启音频解码线程、音频播放线程、视频解码线程*/
/* event_loop 目前只处理退出和 allocate Pictur*/
event_loop(is);
return 0;
}
int video_init( void ) {
avcodec_register_all();
av_register_all();
conv_frame = avcodec_alloc_frame();
if( !conv_frame ) {
fprintf( stderr, "Warning: Couldn't allocate video conversion frame\n" );
return -1;
}
packet_queue_init( &audio_queue );
frame_queue_init( &video_queue );
url_set_interrupt_cb( video_stopped );
return 0;
}