[alsa-devel] alsactl adds volume controls?

[Raymond Yau]

2010/10/11 Colin Guthrie <gmane at colin.guthr.ie>

> 'Twas brillig, and Raymond Yau at 11/10/10 02:34 did gyre and gimble:
> > How about softvol plugin , the dB scale seem wrong, it alwaysl mute at
> > min_dB even if I change min_dB to -21 ?
>
> I would suspect that this needs fixed also. David's alsamixertest does
> indeed report when PCM mutes at min, to identify this error case.
>
> Col
>
>
if you look at the 16bits preset_dB_value table , the minimum value is not
zero and it is strange that it mute at min_dB -51dB

static const unsigned int preset_dB_value[PRESET_RESOLUTION] = {
	0x00b8, 0x00bd, 0x00c1, 0x00c5, 0x00ca, 0x00cf, 0x00d4, 0x00d9,
	0x00de, 0x00e3, 0x00e8, 0x00ed, 0x00f3, 0x00f9, 0x00fe, 0x0104,
	0x010a, 0x0111, 0x0117, 0x011e, 0x0124, 0x012b, 0x0132, 0x0139,
	0x0140, 0x0148, 0x0150, 0x0157, 0x015f, 0x0168, 0x0170, 0x0179,
	0x0181, 0x018a, 0x0194, 0x019d, 0x01a7, 0x01b0, 0x01bb, 0x01c5,
	0x01cf, 0x01da, 0x01e5, 0x01f1, 0x01fc, 0x0208, 0x0214, 0x0221,
	0x022d, 0x023a, 0x0248, 0x0255, 0x0263, 0x0271, 0x0280, 0x028f,
	0x029e, 0x02ae, 0x02be, 0x02ce, 0x02df, 0x02f0, 0x0301, 0x0313,
	0x0326, 0x0339, 0x034c, 0x035f, 0x0374, 0x0388, 0x039d, 0x03b3,
	0x03c9, 0x03df, 0x03f7, 0x040e, 0x0426, 0x043f, 0x0458, 0x0472,
	0x048d, 0x04a8, 0x04c4, 0x04e0, 0x04fd, 0x051b, 0x053a, 0x0559,
	0x0579, 0x0599, 0x05bb, 0x05dd, 0x0600, 0x0624, 0x0648, 0x066e,
	0x0694, 0x06bb, 0x06e3, 0x070c, 0x0737, 0x0762, 0x078e, 0x07bb,
	0x07e9, 0x0818, 0x0848, 0x087a, 0x08ac, 0x08e0, 0x0915, 0x094b,
	0x0982, 0x09bb, 0x09f5, 0x0a30, 0x0a6d, 0x0aab, 0x0aeb, 0x0b2c,
	0x0b6f, 0x0bb3, 0x0bf9, 0x0c40, 0x0c89, 0x0cd4, 0x0d21, 0x0d6f,
	0x0dbf, 0x0e11, 0x0e65, 0x0ebb, 0x0f12, 0x0f6c, 0x0fc8, 0x1026,
	0x1087, 0x10e9, 0x114e, 0x11b5, 0x121f, 0x128b, 0x12fa, 0x136b,
	0x13df, 0x1455, 0x14ce, 0x154a, 0x15c9, 0x164b, 0x16d0, 0x1758,
	0x17e4, 0x1872, 0x1904, 0x1999, 0x1a32, 0x1ace, 0x1b6e, 0x1c11,
	0x1cb9, 0x1d64, 0x1e13, 0x1ec7, 0x1f7e, 0x203a, 0x20fa, 0x21bf,
	0x2288, 0x2356, 0x2429, 0x2500, 0x25dd, 0x26bf, 0x27a6, 0x2892,
	0x2984, 0x2a7c, 0x2b79, 0x2c7c, 0x2d85, 0x2e95, 0x2fab, 0x30c7,
	0x31ea, 0x3313, 0x3444, 0x357c, 0x36bb, 0x3801, 0x394f, 0x3aa5,
	0x3c02, 0x3d68, 0x3ed6, 0x404d, 0x41cd, 0x4355, 0x44e6, 0x4681,
	0x4826, 0x49d4, 0x4b8c, 0x4d4f, 0x4f1c, 0x50f3, 0x52d6, 0x54c4,
	0x56be, 0x58c3, 0x5ad4, 0x5cf2, 0x5f1c, 0x6153, 0x6398, 0x65e9,
	0x6849, 0x6ab7, 0x6d33, 0x6fbf, 0x7259, 0x7503, 0x77bd, 0x7a87,
	0x7d61, 0x804d, 0x834a, 0x8659, 0x897a, 0x8cae, 0x8ff5, 0x934f,
	0x96bd, 0x9a40, 0x9dd8, 0xa185, 0xa548, 0xa922, 0xad13, 0xb11b,
	0xb53b, 0xb973, 0xbdc5, 0xc231, 0xc6b7, 0xcb58, 0xd014, 0xd4ed,
	0xd9e3, 0xdef6, 0xe428, 0xe978, 0xeee8, 0xf479, 0xfa2b, 0xffff,
}