Hi Haris,
Here's a little program I did to draw audio waveform on various
backgrounds. It is C code however.
http://www.oifii.org/ns-org/nsd/ar/cp/audio_spi/spiffmpegmuxingspectrum_qt2016/spiffmpegmuxingspectrum-RGB24_qt2016.c
Steph
On 02/04/2016 2:34 PM, Haris PP wrote:
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
........................
}
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