607 lines
16 KiB
C
607 lines
16 KiB
C
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/*
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* PCM Interface - misc routines
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* Copyright (c) 1998 by Jaroslav Kysela <perex@perex.cz>
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*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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 Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; 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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#include <linux/time.h>
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#include <linux/export.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include "pcm_local.h"
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#define SND_PCM_FORMAT_UNKNOWN (-1)
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/* NOTE: "signed" prefix must be given below since the default char is
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* unsigned on some architectures!
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*/
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struct pcm_format_data {
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unsigned char width; /* bit width */
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unsigned char phys; /* physical bit width */
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signed char le; /* 0 = big-endian, 1 = little-endian, -1 = others */
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signed char signd; /* 0 = unsigned, 1 = signed, -1 = others */
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unsigned char silence[8]; /* silence data to fill */
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};
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/* we do lots of calculations on snd_pcm_format_t; shut up sparse */
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#define INT __force int
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static struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = {
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[SNDRV_PCM_FORMAT_S8] = {
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.width = 8, .phys = 8, .le = -1, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_U8] = {
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.width = 8, .phys = 8, .le = -1, .signd = 0,
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.silence = { 0x80 },
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},
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[SNDRV_PCM_FORMAT_S16_LE] = {
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.width = 16, .phys = 16, .le = 1, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_S16_BE] = {
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.width = 16, .phys = 16, .le = 0, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_U16_LE] = {
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.width = 16, .phys = 16, .le = 1, .signd = 0,
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.silence = { 0x00, 0x80 },
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},
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[SNDRV_PCM_FORMAT_U16_BE] = {
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.width = 16, .phys = 16, .le = 0, .signd = 0,
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.silence = { 0x80, 0x00 },
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},
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[SNDRV_PCM_FORMAT_S24_LE] = {
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.width = 24, .phys = 32, .le = 1, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_S24_BE] = {
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.width = 24, .phys = 32, .le = 0, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_U24_LE] = {
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.width = 24, .phys = 32, .le = 1, .signd = 0,
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.silence = { 0x00, 0x00, 0x80 },
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},
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[SNDRV_PCM_FORMAT_U24_BE] = {
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.width = 24, .phys = 32, .le = 0, .signd = 0,
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.silence = { 0x00, 0x80, 0x00, 0x00 },
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},
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[SNDRV_PCM_FORMAT_S32_LE] = {
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.width = 32, .phys = 32, .le = 1, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_S32_BE] = {
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.width = 32, .phys = 32, .le = 0, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_U32_LE] = {
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.width = 32, .phys = 32, .le = 1, .signd = 0,
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.silence = { 0x00, 0x00, 0x00, 0x80 },
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},
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[SNDRV_PCM_FORMAT_U32_BE] = {
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.width = 32, .phys = 32, .le = 0, .signd = 0,
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.silence = { 0x80, 0x00, 0x00, 0x00 },
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},
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[SNDRV_PCM_FORMAT_FLOAT_LE] = {
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.width = 32, .phys = 32, .le = 1, .signd = -1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_FLOAT_BE] = {
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.width = 32, .phys = 32, .le = 0, .signd = -1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_FLOAT64_LE] = {
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.width = 64, .phys = 64, .le = 1, .signd = -1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_FLOAT64_BE] = {
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.width = 64, .phys = 64, .le = 0, .signd = -1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE] = {
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.width = 32, .phys = 32, .le = 1, .signd = -1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE] = {
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.width = 32, .phys = 32, .le = 0, .signd = -1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_MU_LAW] = {
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.width = 8, .phys = 8, .le = -1, .signd = -1,
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.silence = { 0x7f },
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},
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[SNDRV_PCM_FORMAT_A_LAW] = {
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.width = 8, .phys = 8, .le = -1, .signd = -1,
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.silence = { 0x55 },
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},
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[SNDRV_PCM_FORMAT_IMA_ADPCM] = {
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.width = 4, .phys = 4, .le = -1, .signd = -1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_G723_24] = {
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.width = 3, .phys = 3, .le = -1, .signd = -1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_G723_40] = {
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.width = 5, .phys = 5, .le = -1, .signd = -1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_DSD_U8] = {
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.width = 8, .phys = 8, .le = 1, .signd = 0,
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.silence = { 0x69 },
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},
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[SNDRV_PCM_FORMAT_DSD_U16_LE] = {
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.width = 16, .phys = 16, .le = 1, .signd = 0,
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.silence = { 0x69, 0x69 },
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},
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[SNDRV_PCM_FORMAT_DSD_U32_LE] = {
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.width = 32, .phys = 32, .le = 1, .signd = 0,
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.silence = { 0x69, 0x69, 0x69, 0x69 },
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},
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[SNDRV_PCM_FORMAT_DSD_U16_BE] = {
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.width = 16, .phys = 16, .le = 0, .signd = 0,
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.silence = { 0x69, 0x69 },
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},
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[SNDRV_PCM_FORMAT_DSD_U32_BE] = {
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.width = 32, .phys = 32, .le = 0, .signd = 0,
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.silence = { 0x69, 0x69, 0x69, 0x69 },
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},
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/* FIXME: the following two formats are not defined properly yet */
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[SNDRV_PCM_FORMAT_MPEG] = {
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.le = -1, .signd = -1,
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},
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[SNDRV_PCM_FORMAT_GSM] = {
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.le = -1, .signd = -1,
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},
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[SNDRV_PCM_FORMAT_S20_LE] = {
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.width = 20, .phys = 32, .le = 1, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_S20_BE] = {
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.width = 20, .phys = 32, .le = 0, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_U20_LE] = {
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.width = 20, .phys = 32, .le = 1, .signd = 0,
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.silence = { 0x00, 0x00, 0x08, 0x00 },
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},
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[SNDRV_PCM_FORMAT_U20_BE] = {
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.width = 20, .phys = 32, .le = 0, .signd = 0,
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.silence = { 0x00, 0x08, 0x00, 0x00 },
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},
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/* FIXME: the following format is not defined properly yet */
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[SNDRV_PCM_FORMAT_SPECIAL] = {
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.le = -1, .signd = -1,
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},
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[SNDRV_PCM_FORMAT_S24_3LE] = {
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.width = 24, .phys = 24, .le = 1, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_S24_3BE] = {
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.width = 24, .phys = 24, .le = 0, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_U24_3LE] = {
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.width = 24, .phys = 24, .le = 1, .signd = 0,
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.silence = { 0x00, 0x00, 0x80 },
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},
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[SNDRV_PCM_FORMAT_U24_3BE] = {
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.width = 24, .phys = 24, .le = 0, .signd = 0,
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.silence = { 0x80, 0x00, 0x00 },
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},
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[SNDRV_PCM_FORMAT_S20_3LE] = {
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.width = 20, .phys = 24, .le = 1, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_S20_3BE] = {
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.width = 20, .phys = 24, .le = 0, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_U20_3LE] = {
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.width = 20, .phys = 24, .le = 1, .signd = 0,
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.silence = { 0x00, 0x00, 0x08 },
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},
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[SNDRV_PCM_FORMAT_U20_3BE] = {
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.width = 20, .phys = 24, .le = 0, .signd = 0,
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.silence = { 0x08, 0x00, 0x00 },
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},
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[SNDRV_PCM_FORMAT_S18_3LE] = {
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.width = 18, .phys = 24, .le = 1, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_S18_3BE] = {
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.width = 18, .phys = 24, .le = 0, .signd = 1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_U18_3LE] = {
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.width = 18, .phys = 24, .le = 1, .signd = 0,
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.silence = { 0x00, 0x00, 0x02 },
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},
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[SNDRV_PCM_FORMAT_U18_3BE] = {
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.width = 18, .phys = 24, .le = 0, .signd = 0,
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.silence = { 0x02, 0x00, 0x00 },
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},
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[SNDRV_PCM_FORMAT_G723_24_1B] = {
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.width = 3, .phys = 8, .le = -1, .signd = -1,
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.silence = {},
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},
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[SNDRV_PCM_FORMAT_G723_40_1B] = {
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.width = 5, .phys = 8, .le = -1, .signd = -1,
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.silence = {},
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},
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};
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/**
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* snd_pcm_format_signed - Check the PCM format is signed linear
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* @format: the format to check
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*
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* Return: 1 if the given PCM format is signed linear, 0 if unsigned
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* linear, and a negative error code for non-linear formats.
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*/
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int snd_pcm_format_signed(snd_pcm_format_t format)
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{
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int val;
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if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
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return -EINVAL;
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if ((val = pcm_formats[(INT)format].signd) < 0)
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return -EINVAL;
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return val;
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}
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EXPORT_SYMBOL(snd_pcm_format_signed);
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/**
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* snd_pcm_format_unsigned - Check the PCM format is unsigned linear
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* @format: the format to check
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*
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* Return: 1 if the given PCM format is unsigned linear, 0 if signed
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* linear, and a negative error code for non-linear formats.
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*/
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int snd_pcm_format_unsigned(snd_pcm_format_t format)
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{
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int val;
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val = snd_pcm_format_signed(format);
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if (val < 0)
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return val;
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return !val;
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}
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EXPORT_SYMBOL(snd_pcm_format_unsigned);
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/**
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* snd_pcm_format_linear - Check the PCM format is linear
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* @format: the format to check
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*
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* Return: 1 if the given PCM format is linear, 0 if not.
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*/
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int snd_pcm_format_linear(snd_pcm_format_t format)
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{
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return snd_pcm_format_signed(format) >= 0;
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}
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EXPORT_SYMBOL(snd_pcm_format_linear);
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/**
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* snd_pcm_format_little_endian - Check the PCM format is little-endian
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* @format: the format to check
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*
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* Return: 1 if the given PCM format is little-endian, 0 if
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* big-endian, or a negative error code if endian not specified.
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*/
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int snd_pcm_format_little_endian(snd_pcm_format_t format)
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{
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int val;
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if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
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return -EINVAL;
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if ((val = pcm_formats[(INT)format].le) < 0)
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return -EINVAL;
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return val;
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}
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EXPORT_SYMBOL(snd_pcm_format_little_endian);
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/**
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* snd_pcm_format_big_endian - Check the PCM format is big-endian
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* @format: the format to check
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*
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* Return: 1 if the given PCM format is big-endian, 0 if
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* little-endian, or a negative error code if endian not specified.
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*/
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int snd_pcm_format_big_endian(snd_pcm_format_t format)
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{
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int val;
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val = snd_pcm_format_little_endian(format);
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if (val < 0)
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return val;
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return !val;
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}
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EXPORT_SYMBOL(snd_pcm_format_big_endian);
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/**
|
||
|
|
* snd_pcm_format_width - return the bit-width of the format
|
||
|
|
* @format: the format to check
|
||
|
|
*
|
||
|
|
* Return: The bit-width of the format, or a negative error code
|
||
|
|
* if unknown format.
|
||
|
|
*/
|
||
|
|
int snd_pcm_format_width(snd_pcm_format_t format)
|
||
|
|
{
|
||
|
|
int val;
|
||
|
|
if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
|
||
|
|
return -EINVAL;
|
||
|
|
if ((val = pcm_formats[(INT)format].width) == 0)
|
||
|
|
return -EINVAL;
|
||
|
|
return val;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(snd_pcm_format_width);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* snd_pcm_format_physical_width - return the physical bit-width of the format
|
||
|
|
* @format: the format to check
|
||
|
|
*
|
||
|
|
* Return: The physical bit-width of the format, or a negative error code
|
||
|
|
* if unknown format.
|
||
|
|
*/
|
||
|
|
int snd_pcm_format_physical_width(snd_pcm_format_t format)
|
||
|
|
{
|
||
|
|
int val;
|
||
|
|
if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
|
||
|
|
return -EINVAL;
|
||
|
|
if ((val = pcm_formats[(INT)format].phys) == 0)
|
||
|
|
return -EINVAL;
|
||
|
|
return val;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(snd_pcm_format_physical_width);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* snd_pcm_format_size - return the byte size of samples on the given format
|
||
|
|
* @format: the format to check
|
||
|
|
* @samples: sampling rate
|
||
|
|
*
|
||
|
|
* Return: The byte size of the given samples for the format, or a
|
||
|
|
* negative error code if unknown format.
|
||
|
|
*/
|
||
|
|
ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)
|
||
|
|
{
|
||
|
|
int phys_width = snd_pcm_format_physical_width(format);
|
||
|
|
if (phys_width < 0)
|
||
|
|
return -EINVAL;
|
||
|
|
return samples * phys_width / 8;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(snd_pcm_format_size);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* snd_pcm_format_silence_64 - return the silent data in 8 bytes array
|
||
|
|
* @format: the format to check
|
||
|
|
*
|
||
|
|
* Return: The format pattern to fill or %NULL if error.
|
||
|
|
*/
|
||
|
|
const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format)
|
||
|
|
{
|
||
|
|
if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
|
||
|
|
return NULL;
|
||
|
|
if (! pcm_formats[(INT)format].phys)
|
||
|
|
return NULL;
|
||
|
|
return pcm_formats[(INT)format].silence;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(snd_pcm_format_silence_64);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* snd_pcm_format_set_silence - set the silence data on the buffer
|
||
|
|
* @format: the PCM format
|
||
|
|
* @data: the buffer pointer
|
||
|
|
* @samples: the number of samples to set silence
|
||
|
|
*
|
||
|
|
* Sets the silence data on the buffer for the given samples.
|
||
|
|
*
|
||
|
|
* Return: Zero if successful, or a negative error code on failure.
|
||
|
|
*/
|
||
|
|
int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
|
||
|
|
{
|
||
|
|
int width;
|
||
|
|
unsigned char *dst, *pat;
|
||
|
|
|
||
|
|
if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
|
||
|
|
return -EINVAL;
|
||
|
|
if (samples == 0)
|
||
|
|
return 0;
|
||
|
|
width = pcm_formats[(INT)format].phys; /* physical width */
|
||
|
|
pat = pcm_formats[(INT)format].silence;
|
||
|
|
if (! width)
|
||
|
|
return -EINVAL;
|
||
|
|
/* signed or 1 byte data */
|
||
|
|
if (pcm_formats[(INT)format].signd == 1 || width <= 8) {
|
||
|
|
unsigned int bytes = samples * width / 8;
|
||
|
|
memset(data, *pat, bytes);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
/* non-zero samples, fill using a loop */
|
||
|
|
width /= 8;
|
||
|
|
dst = data;
|
||
|
|
#if 0
|
||
|
|
while (samples--) {
|
||
|
|
memcpy(dst, pat, width);
|
||
|
|
dst += width;
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
/* a bit optimization for constant width */
|
||
|
|
switch (width) {
|
||
|
|
case 2:
|
||
|
|
while (samples--) {
|
||
|
|
memcpy(dst, pat, 2);
|
||
|
|
dst += 2;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 3:
|
||
|
|
while (samples--) {
|
||
|
|
memcpy(dst, pat, 3);
|
||
|
|
dst += 3;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
while (samples--) {
|
||
|
|
memcpy(dst, pat, 4);
|
||
|
|
dst += 4;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 8:
|
||
|
|
while (samples--) {
|
||
|
|
memcpy(dst, pat, 8);
|
||
|
|
dst += 8;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(snd_pcm_format_set_silence);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* snd_pcm_limit_hw_rates - determine rate_min/rate_max fields
|
||
|
|
* @runtime: the runtime instance
|
||
|
|
*
|
||
|
|
* Determines the rate_min and rate_max fields from the rates bits of
|
||
|
|
* the given runtime->hw.
|
||
|
|
*
|
||
|
|
* Return: Zero if successful.
|
||
|
|
*/
|
||
|
|
int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
for (i = 0; i < (int)snd_pcm_known_rates.count; i++) {
|
||
|
|
if (runtime->hw.rates & (1 << i)) {
|
||
|
|
runtime->hw.rate_min = snd_pcm_known_rates.list[i];
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {
|
||
|
|
if (runtime->hw.rates & (1 << i)) {
|
||
|
|
runtime->hw.rate_max = snd_pcm_known_rates.list[i];
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
|
||
|
|
* @rate: the sample rate to convert
|
||
|
|
*
|
||
|
|
* Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or
|
||
|
|
* SNDRV_PCM_RATE_KNOT for an unknown rate.
|
||
|
|
*/
|
||
|
|
unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate)
|
||
|
|
{
|
||
|
|
unsigned int i;
|
||
|
|
|
||
|
|
for (i = 0; i < snd_pcm_known_rates.count; i++)
|
||
|
|
if (snd_pcm_known_rates.list[i] == rate)
|
||
|
|
return 1u << i;
|
||
|
|
return SNDRV_PCM_RATE_KNOT;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* snd_pcm_rate_bit_to_rate - converts SNDRV_PCM_RATE_xxx bit to sample rate
|
||
|
|
* @rate_bit: the rate bit to convert
|
||
|
|
*
|
||
|
|
* Return: The sample rate that corresponds to the given SNDRV_PCM_RATE_xxx flag
|
||
|
|
* or 0 for an unknown rate bit.
|
||
|
|
*/
|
||
|
|
unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit)
|
||
|
|
{
|
||
|
|
unsigned int i;
|
||
|
|
|
||
|
|
for (i = 0; i < snd_pcm_known_rates.count; i++)
|
||
|
|
if ((1u << i) == rate_bit)
|
||
|
|
return snd_pcm_known_rates.list[i];
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(snd_pcm_rate_bit_to_rate);
|
||
|
|
|
||
|
|
static unsigned int snd_pcm_rate_mask_sanitize(unsigned int rates)
|
||
|
|
{
|
||
|
|
if (rates & SNDRV_PCM_RATE_CONTINUOUS)
|
||
|
|
return SNDRV_PCM_RATE_CONTINUOUS;
|
||
|
|
else if (rates & SNDRV_PCM_RATE_KNOT)
|
||
|
|
return SNDRV_PCM_RATE_KNOT;
|
||
|
|
return rates;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* snd_pcm_rate_mask_intersect - computes the intersection between two rate masks
|
||
|
|
* @rates_a: The first rate mask
|
||
|
|
* @rates_b: The second rate mask
|
||
|
|
*
|
||
|
|
* This function computes the rates that are supported by both rate masks passed
|
||
|
|
* to the function. It will take care of the special handling of
|
||
|
|
* SNDRV_PCM_RATE_CONTINUOUS and SNDRV_PCM_RATE_KNOT.
|
||
|
|
*
|
||
|
|
* Return: A rate mask containing the rates that are supported by both rates_a
|
||
|
|
* and rates_b.
|
||
|
|
*/
|
||
|
|
unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
|
||
|
|
unsigned int rates_b)
|
||
|
|
{
|
||
|
|
rates_a = snd_pcm_rate_mask_sanitize(rates_a);
|
||
|
|
rates_b = snd_pcm_rate_mask_sanitize(rates_b);
|
||
|
|
|
||
|
|
if (rates_a & SNDRV_PCM_RATE_CONTINUOUS)
|
||
|
|
return rates_b;
|
||
|
|
else if (rates_b & SNDRV_PCM_RATE_CONTINUOUS)
|
||
|
|
return rates_a;
|
||
|
|
else if (rates_a & SNDRV_PCM_RATE_KNOT)
|
||
|
|
return rates_b;
|
||
|
|
else if (rates_b & SNDRV_PCM_RATE_KNOT)
|
||
|
|
return rates_a;
|
||
|
|
return rates_a & rates_b;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(snd_pcm_rate_mask_intersect);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* snd_pcm_rate_range_to_bits - converts rate range to SNDRV_PCM_RATE_xxx bit
|
||
|
|
* @rate_min: the minimum sample rate
|
||
|
|
* @rate_max: the maximum sample rate
|
||
|
|
*
|
||
|
|
* This function has an implicit assumption: the rates in the given range have
|
||
|
|
* only the pre-defined rates like 44100 or 16000.
|
||
|
|
*
|
||
|
|
* Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate range,
|
||
|
|
* or SNDRV_PCM_RATE_KNOT for an unknown range.
|
||
|
|
*/
|
||
|
|
unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
|
||
|
|
unsigned int rate_max)
|
||
|
|
{
|
||
|
|
unsigned int rates = 0;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < snd_pcm_known_rates.count; i++) {
|
||
|
|
if (snd_pcm_known_rates.list[i] >= rate_min
|
||
|
|
&& snd_pcm_known_rates.list[i] <= rate_max)
|
||
|
|
rates |= 1 << i;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!rates)
|
||
|
|
rates = SNDRV_PCM_RATE_KNOT;
|
||
|
|
|
||
|
|
return rates;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(snd_pcm_rate_range_to_bits);
|