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085f306541
Add new types for TLV dB scale specified with min/max values instead of min/step since the resolution can't match always with the one a device provides. For example, usb audio devices give 1/256 dB resolution while ALSA TLV is based on 1/100 dB resolution. The new min/max types have less problems because the possible rounding error happens only at min/max. Signed-off-by: Takashi Iwai <tiwai@suse.de>
74 lines
3 KiB
C
74 lines
3 KiB
C
#ifndef __SOUND_TLV_H
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#define __SOUND_TLV_H
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/*
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* Advanced Linux Sound Architecture - ALSA - Driver
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* Copyright (c) 2006 by Jaroslav Kysela <perex@perex.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/*
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* TLV structure is right behind the struct snd_ctl_tlv:
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* unsigned int type - see SNDRV_CTL_TLVT_*
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* unsigned int length
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* .... data aligned to sizeof(unsigned int), use
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* block_length = (length + (sizeof(unsigned int) - 1)) &
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* ~(sizeof(unsigned int) - 1)) ....
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*/
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#define SNDRV_CTL_TLVT_CONTAINER 0 /* one level down - group of TLVs */
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#define SNDRV_CTL_TLVT_DB_SCALE 1 /* dB scale */
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#define SNDRV_CTL_TLVT_DB_LINEAR 2 /* linear volume */
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#define SNDRV_CTL_TLVT_DB_RANGE 3 /* dB range container */
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#define SNDRV_CTL_TLVT_DB_MINMAX 4 /* dB scale with min/max */
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#define SNDRV_CTL_TLVT_DB_MINMAX_MUTE 5 /* dB scale with min/max with mute */
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#define TLV_DB_SCALE_ITEM(min, step, mute) \
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SNDRV_CTL_TLVT_DB_SCALE, 2 * sizeof(unsigned int), \
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(min), ((step) & 0xffff) | ((mute) ? 0x10000 : 0)
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#define DECLARE_TLV_DB_SCALE(name, min, step, mute) \
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unsigned int name[] = { TLV_DB_SCALE_ITEM(min, step, mute) }
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/* dB scale specified with min/max values instead of step */
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#define TLV_DB_MINMAX_ITEM(min_dB, max_dB) \
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SNDRV_CTL_TLVT_DB_MINMAX, 2 * sizeof(unsigned int), \
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(min_dB), (max_dB)
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#define TLV_DB_MINMAX_MUTE_ITEM(min_dB, max_dB) \
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SNDRV_CTL_TLVT_DB_MINMAX_MUTE, 2 * sizeof(unsigned int), \
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(min_dB), (max_dB)
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#define DECLARE_TLV_DB_MINMAX(name, min_dB, max_dB) \
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unsigned int name[] = { TLV_DB_MINMAX_ITEM(min_dB, max_dB) }
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#define DECLARE_TLV_DB_MINMAX_MUTE(name, min_dB, max_dB) \
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unsigned int name[] = { TLV_DB_MINMAX_MUTE_ITEM(min_dB, max_dB) }
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/* linear volume between min_dB and max_dB (.01dB unit) */
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#define TLV_DB_LINEAR_ITEM(min_dB, max_dB) \
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SNDRV_CTL_TLVT_DB_LINEAR, 2 * sizeof(unsigned int), \
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(min_dB), (max_dB)
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#define DECLARE_TLV_DB_LINEAR(name, min_dB, max_dB) \
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unsigned int name[] = { TLV_DB_LINEAR_ITEM(min_dB, max_dB) }
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/* dB range container */
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/* Each item is: <min> <max> <TLV> */
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/* The below assumes that each item TLV is 4 words like DB_SCALE or LINEAR */
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#define TLV_DB_RANGE_HEAD(num) \
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SNDRV_CTL_TLVT_DB_RANGE, 6 * (num) * sizeof(unsigned int)
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#define TLV_DB_GAIN_MUTE -9999999
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#endif /* __SOUND_TLV_H */
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