MAX_PCM_SUBSTREAMS
struct loopback_cable *cables[MAX_PCM_SUBSTREAMS][2];
struct loopback_setup setup[MAX_PCM_SUBSTREAMS][2];
for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++)
if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;