chn_getvolume_matrix
int chn_getvolume_matrix(struct pcm_channel *c, int vc, int vt);
*(int *)arg = chn_getvolume_matrix(ch,
*(int *)arg |= chn_getvolume_matrix(ch,
*(int *)arg = chn_getvolume_matrix(ch,
*(int *)arg |= chn_getvolume_matrix(ch,
*(int *)arg = chn_getvolume_matrix(c, SND_VOL_C_PCM, SND_CHN_T_FL);
chn_getvolume_matrix(c, SND_VOL_C_PCM, SND_CHN_T_FR) << 8;
chn_getvolume_matrix(c, SND_VOL_C_PCM, SND_CHN_T_FL));
chn_getvolume_matrix(c, SND_VOL_C_PCM, SND_CHN_T_FR));