[FFmpeg-devel] ffmpeg audio data for ploting wave form

[Haris PP]

Hi,

I need to plot wave form of audio as explained here
http://stackoverflow.com/questions/16509906/ffmpeg-can-i-draw-an-audio-channel-as-an-image,
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();
    while(av_read_frame(container,&packet)>=0)
     {

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