2d3391ec0e
This patch implements the basic data types for the standard channel mapping API handling. - The definitions of the channel positions and the new TLV types are added in sound/asound.h and sound/tlv.h, so that they can be referred from user-space. - Introduced a new helper function snd_pcm_add_chmap_ctls() to create control elements representing the channel maps for each PCM (sub)stream. - Some standard pre-defined channel maps are provided for convenience. Signed-off-by: Takashi Iwai <tiwai@suse.de>
97 lines
3.8 KiB
C
97 lines
3.8 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_ITEM(type, ...) \
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(type), TLV_LENGTH(__VA_ARGS__), __VA_ARGS__
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#define TLV_LENGTH(...) \
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((unsigned int)sizeof((const unsigned int[]) { __VA_ARGS__ }))
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#define TLV_CONTAINER_ITEM(...) \
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TLV_ITEM(SNDRV_CTL_TLVT_CONTAINER, __VA_ARGS__)
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#define DECLARE_TLV_CONTAINER(name, ...) \
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unsigned int name[] = { TLV_CONTAINER_ITEM(__VA_ARGS__) }
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#define TLV_DB_SCALE_MASK 0xffff
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#define TLV_DB_SCALE_MUTE 0x10000
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#define TLV_DB_SCALE_ITEM(min, step, mute) \
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TLV_ITEM(SNDRV_CTL_TLVT_DB_SCALE, \
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(min), \
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((step) & TLV_DB_SCALE_MASK) | \
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((mute) ? TLV_DB_SCALE_MUTE : 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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TLV_ITEM(SNDRV_CTL_TLVT_DB_MINMAX, (min_dB), (max_dB))
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#define TLV_DB_MINMAX_MUTE_ITEM(min_dB, max_dB) \
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TLV_ITEM(SNDRV_CTL_TLVT_DB_MINMAX_MUTE, (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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TLV_ITEM(SNDRV_CTL_TLVT_DB_LINEAR, (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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#define TLV_DB_RANGE_ITEM(...) \
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TLV_ITEM(SNDRV_CTL_TLVT_DB_RANGE, __VA_ARGS__)
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#define DECLARE_TLV_DB_RANGE(name, ...) \
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unsigned int name[] = { TLV_DB_RANGE_ITEM(__VA_ARGS__) }
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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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/*
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* channel-mapping TLV items
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* TLV length must match with num_channels
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*/
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#define SNDRV_CTL_TLVT_CHMAP_FIXED 0x101 /* fixed channel position */
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#define SNDRV_CTL_TLVT_CHMAP_VAR 0x102 /* channels freely swappable */
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#define SNDRV_CTL_TLVT_CHMAP_PAIRED 0x103 /* pair-wise swappable */
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#endif /* __SOUND_TLV_H */
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