fn->fc->samplerate = pmd->frame.header.samplerate;
fn->fc->channels = MAD_NCHANNELS(&pmd->frame.header);
ret = mad_frame_decode(&pmd->frame, &pmd->stream);
fn->fc->samplerate = pmd->frame.header.samplerate;
fn->fc->channels = MAD_NCHANNELS(&pmd->frame.header);
ret = mad_frame_decode(&pmd->frame, &pmd->stream);