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