ffplay 线程分析

大概跟了一下代码 里面比较只要的有五个线程 四个队列

1  video_thread 从pkt queue里面取到pkt解码然后放到frame queue里面

stream_component_open-->

SDL_CreateThread-->

video_thread-->

get_video_frame-->

decoder_decode_frame

packet_queue_get is->videoq-->

avcodec_send_packet

avcodec_receive_frame

queue_picture

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frame_queue_push(&is->pictq)

2  audio_thread 从pkt queue里面取到pkt解码然后放到frame queue里面

audio_thread-->

decoder_decode_frame

packet_queue_get is->audioq -->

avcodec_send_packet

avcodec_receive_frame

frame_queue_push(&is->sampq)

3 把文件或者流里面的pkt放到pkt queue

stream_open-->

SDL_CreateThread

read_thread

av_read_frame

packet_queue_put is->videoq

packet_queue_put is->audioq

4 显示线程 从frame queue里面取到图像显示

event_loop-->

refresh_loop_wait_event-->

video_refresh

frame_queue_peek (&is->pictq)

video_display

5 由sdl设备调用 frame queue 里面的声音数据 is->audio_buf

sdl_audio_callback --> //the function to call when the audio device needs more data

audio_decode_frame

frame_queue_next &is->sampq is->audio_buf