[Libav-user] ffmpeg audio data for ploting wave form

Haris PP harispp786 at gmail.com
Sat Apr 2 20:34:08 CEST 2016


I need to plot wave form of audio as explained here
I found that some command line option for plotting to image, but my
requirement is do from c++ code and draw live waveform on UI. I am able to
decode the audio data successfully, but no idea how the data is stored in
`AVFrame` `extended_data` pointer. The audio can be either stereo or mono.

    AVFrame *frame=av_frame_alloc();

        int len=avcodec_decode_audio4(ctx,frame,&frameFinished,&packet);
        frame->extended_data //how data stored inside the pointer
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