文章目录
- 流程图
- stream open
- stream close
流程图
stream open
- 初始化SDL以允许⾳频输出;
- 初始化帧Frame队列
- 初始化包Packet队列
- 初始化时钟Clock
- 初始化音量
- 创建解复用读取线程read_thread
- 创建视频刷新线程video_refresh_thread
int FFPlayer::stream_open(const char *file_name)
{if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)){av_log(NULL, AV_LOG_FATAL, "Could not initialize SDL - %s\n", SDL_GetError());av_log(NULL, AV_LOG_FATAL, "(Did you set the DISPLAY variable?)\n");return -1;}// 初始化Frame帧队列if (frame_queue_init(&pictq, &videoq, VIDEO_PICTURE_QUEUE_SIZE_DEFAULT) < 0)goto fail;if (frame_queue_init(&sampq, &audioq, SAMPLE_QUEUE_SIZE) < 0)goto fail;// 初始化Packet包队列if (packet_queue_init(&videoq) < 0 ||packet_queue_init(&audioq) < 0 )goto fail;// 初始化时钟init_clock(&audclk);// 创建解复用器读数据线程read_threadread_thread_ = new std::thread(&FFPlayer::read_thread, this);// 创建视频刷新线程video_refresh_thread_ = new std::thread(FFPlayer::video_refresh_thread, this);return 0;
fail:stream_close();return -1;
}
调用过程:
MainWind::OnPlayOrPause()
IjkMediaPlayer::ijkmp_prepare_async()
FFPlayer::ffp_prepare_async_l()
stream_open()
stream close
- 请求关闭read_thread线程
- 关闭解复用器
- 关闭stream,⽐如调⽤stream_component_close:关闭解码线程,释放解码器资源,关闭对应的⾳频、视频设备,包队列,帧队列,释放其他资源
void FFPlayer::stream_close()
{abort_request = 1; // 请求退出if(read_thread_ && read_thread_->joinable()) {read_thread_->join(); // 等待线程退出}/* close each stream */if (audio_stream >= 0)stream_component_close(audio_stream); // 解码器线程请求abort的时候有调用 packet_queue_abortif (video_stream >= 0)stream_component_close(video_stream);// 关闭解复用器 avformat_close_input(&is->ic);// 释放packet队列packet_queue_destroy(&videoq);packet_queue_destroy(&audioq);// 释放frame队列frame_queue_destory(&pictq);frame_queue_destory(&sampq);if(input_filename_) {free(input_filename_);input_filename_ = NULL;}
}
调用过程:
MainWind::OnStop()
IjkMediaPlayer::ijkmp_destroy()
FFPlayer::ffp_destroy()
stream_close();