audio_track_inputblk_as_usrbyte
ao->offset = audio_track_inputblk_as_usrbyte(track, offset);
bytes = audio_track_inputblk_as_usrbyte(track, track->input->used);
static int audio_track_inputblk_as_usrbyte(const audio_track_t *, int);
ri->buffer_size = audio_track_inputblk_as_usrbyte(rtrack,