In ijkplayer, the streamcomponentopen() function is used to open the media stream component. It is used to open media streaming components such as audio, video, and subtitles, making them ready to receive and decode the corresponding media data.
The detailed description of this function is as follows:
parameter:
avFormatContext: AVFormatContext structure pointer containing media content information.
type: Specifies the type of media stream component to open, which can be audio, video or subtitles.
streamIndex: The index of the media stream to be opened in AVFormatContext.
Logic flow:
First, get the corresponding AVStream structure pointer from avFormatContext through streamIndex.
Then, according to different media stream types (types), corresponding initialization operations are performed.
If it is a video stream, call the video_open() function adopted by ffplay to open the video stream component.
If it is an audio stream, call the audio_open() function adopted by ffplay to open the audio stream component.
If it is a subtitle stream, call the subtitle_open() function adopted by ffplay to open the subtitle stream component.
When the media stream component is opened, related initialization operations will be performed, including configuring decoders, creating audio/video decoder threads, setting callback functions, and so on.
Finally, after successfully opening the media stream component, the corresponding AVCodecContext structure pointer will be saved to the corresponding member variable in the VideoState structure for subsequent use.
Function:
The main function of the streamcomponentopen() function is to open a specific type of media stream component.
It is ready to receive media data and decode it for subsequent consumption.
The media stream component opened by this function can perform playback and related audio and video processing operations, such as displaying video, playing audio, rendering subtitles, and so on.
All in all, the streamcomponentopen() function is a core function in ijkplayer, which is used to open a specific type of media stream component and perform initialization operations for subsequent processing of media data and related audio and video operations