pcm_reader_t *wav_open(pcm_io_context_t *io, int ignore_length);
pcm_reader_t *raw_open(pcm_io_context_t *io,
const pcm_sample_description_t *desc);
pcm_reader_t *wav_open(pcm_io_context_t *io, int ignore_length);
pcm_reader_t *raw_open(pcm_io_context_t *io,
const pcm_sample_description_t *desc);