[linux-block.git] / sound / core / pcm_misc.c

/*
 *  PCM Interface - misc routines
 *  Copyright (c) 1998 by Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as
 *   published by the Free Software Foundation; either version 2 of
 *   the License, or (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Library General Public License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */
  
#include <linux/time.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/pcm.h>

#include "pcm_local.h"

#define SND_PCM_FORMAT_UNKNOWN (-1)

/* NOTE: "signed" prefix must be given below since the default char is
 *       unsigned on some architectures!
 */
struct pcm_format_data {
	unsigned char width;	/* bit width */
	unsigned char phys;	/* physical bit width */
	signed char le;	/* 0 = big-endian, 1 = little-endian, -1 = others */
	signed char signd;	/* 0 = unsigned, 1 = signed, -1 = others */
	unsigned char silence[8];	/* silence data to fill */
};

/* we do lots of calculations on snd_pcm_format_t; shut up sparse */
#define INT	__force int

static bool valid_format(snd_pcm_format_t format)
{
	return (INT)format >= 0 && (INT)format <= (INT)SNDRV_PCM_FORMAT_LAST;
}

static const struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = {
	[SNDRV_PCM_FORMAT_S8] = {
		.width = 8, .phys = 8, .le = -1, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_U8] = {
		.width = 8, .phys = 8, .le = -1, .signd = 0,
		.silence = { 0x80 },
	},
	[SNDRV_PCM_FORMAT_S16_LE] = {
		.width = 16, .phys = 16, .le = 1, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_S16_BE] = {
		.width = 16, .phys = 16, .le = 0, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_U16_LE] = {
		.width = 16, .phys = 16, .le = 1, .signd = 0,
		.silence = { 0x00, 0x80 },
	},
	[SNDRV_PCM_FORMAT_U16_BE] = {
		.width = 16, .phys = 16, .le = 0, .signd = 0,
		.silence = { 0x80, 0x00 },
	},
	[SNDRV_PCM_FORMAT_S24_LE] = {
		.width = 24, .phys = 32, .le = 1, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_S24_BE] = {
		.width = 24, .phys = 32, .le = 0, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_U24_LE] = {
		.width = 24, .phys = 32, .le = 1, .signd = 0,
		.silence = { 0x00, 0x00, 0x80 },
	},
	[SNDRV_PCM_FORMAT_U24_BE] = {
		.width = 24, .phys = 32, .le = 0, .signd = 0,
		.silence = { 0x00, 0x80, 0x00, 0x00 },
	},
	[SNDRV_PCM_FORMAT_S32_LE] = {
		.width = 32, .phys = 32, .le = 1, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_S32_BE] = {
		.width = 32, .phys = 32, .le = 0, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_U32_LE] = {
		.width = 32, .phys = 32, .le = 1, .signd = 0,
		.silence = { 0x00, 0x00, 0x00, 0x80 },
	},
	[SNDRV_PCM_FORMAT_U32_BE] = {
		.width = 32, .phys = 32, .le = 0, .signd = 0,
		.silence = { 0x80, 0x00, 0x00, 0x00 },
	},
	[SNDRV_PCM_FORMAT_FLOAT_LE] = {
		.width = 32, .phys = 32, .le = 1, .signd = -1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_FLOAT_BE] = {
		.width = 32, .phys = 32, .le = 0, .signd = -1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_FLOAT64_LE] = {
		.width = 64, .phys = 64, .le = 1, .signd = -1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_FLOAT64_BE] = {
		.width = 64, .phys = 64, .le = 0, .signd = -1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE] = {
		.width = 32, .phys = 32, .le = 1, .signd = -1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE] = {
		.width = 32, .phys = 32, .le = 0, .signd = -1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_MU_LAW] = {
		.width = 8, .phys = 8, .le = -1, .signd = -1,
		.silence = { 0x7f },
	},
	[SNDRV_PCM_FORMAT_A_LAW] = {
		.width = 8, .phys = 8, .le = -1, .signd = -1,
		.silence = { 0x55 },
	},
	[SNDRV_PCM_FORMAT_IMA_ADPCM] = {
		.width = 4, .phys = 4, .le = -1, .signd = -1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_G723_24] = {
		.width = 3, .phys = 3, .le = -1, .signd = -1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_G723_40] = {
		.width = 5, .phys = 5, .le = -1, .signd = -1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_DSD_U8] = {
		.width = 8, .phys = 8, .le = 1, .signd = 0,
		.silence = { 0x69 },
	},
	[SNDRV_PCM_FORMAT_DSD_U16_LE] = {
		.width = 16, .phys = 16, .le = 1, .signd = 0,
		.silence = { 0x69, 0x69 },
	},
	[SNDRV_PCM_FORMAT_DSD_U32_LE] = {
		.width = 32, .phys = 32, .le = 1, .signd = 0,
		.silence = { 0x69, 0x69, 0x69, 0x69 },
	},
	[SNDRV_PCM_FORMAT_DSD_U16_BE] = {
		.width = 16, .phys = 16, .le = 0, .signd = 0,
		.silence = { 0x69, 0x69 },
	},
	[SNDRV_PCM_FORMAT_DSD_U32_BE] = {
		.width = 32, .phys = 32, .le = 0, .signd = 0,
		.silence = { 0x69, 0x69, 0x69, 0x69 },
	},
	/* FIXME: the following two formats are not defined properly yet */
	[SNDRV_PCM_FORMAT_MPEG] = {
		.le = -1, .signd = -1,
	},
	[SNDRV_PCM_FORMAT_GSM] = {
		.le = -1, .signd = -1,
	},
	[SNDRV_PCM_FORMAT_S20_LE] = {
		.width = 20, .phys = 32, .le = 1, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_S20_BE] = {
		.width = 20, .phys = 32, .le = 0, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_U20_LE] = {
		.width = 20, .phys = 32, .le = 1, .signd = 0,
		.silence = { 0x00, 0x00, 0x08, 0x00 },
	},
	[SNDRV_PCM_FORMAT_U20_BE] = {
		.width = 20, .phys = 32, .le = 0, .signd = 0,
		.silence = { 0x00, 0x08, 0x00, 0x00 },
	},
	/* FIXME: the following format is not defined properly yet */
	[SNDRV_PCM_FORMAT_SPECIAL] = {
		.le = -1, .signd = -1,
	},
	[SNDRV_PCM_FORMAT_S24_3LE] = {
		.width = 24, .phys = 24, .le = 1, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_S24_3BE] = {
		.width = 24, .phys = 24, .le = 0, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_U24_3LE] = {
		.width = 24, .phys = 24, .le = 1, .signd = 0,
		.silence = { 0x00, 0x00, 0x80 },
	},
	[SNDRV_PCM_FORMAT_U24_3BE] = {
		.width = 24, .phys = 24, .le = 0, .signd = 0,
		.silence = { 0x80, 0x00, 0x00 },
	},
	[SNDRV_PCM_FORMAT_S20_3LE] = {
		.width = 20, .phys = 24, .le = 1, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_S20_3BE] = {
		.width = 20, .phys = 24, .le = 0, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_U20_3LE] = {
		.width = 20, .phys = 24, .le = 1, .signd = 0,
		.silence = { 0x00, 0x00, 0x08 },
	},
	[SNDRV_PCM_FORMAT_U20_3BE] = {
		.width = 20, .phys = 24, .le = 0, .signd = 0,
		.silence = { 0x08, 0x00, 0x00 },
	},
	[SNDRV_PCM_FORMAT_S18_3LE] = {
		.width = 18, .phys = 24, .le = 1, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_S18_3BE] = {
		.width = 18, .phys = 24, .le = 0, .signd = 1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_U18_3LE] = {
		.width = 18, .phys = 24, .le = 1, .signd = 0,
		.silence = { 0x00, 0x00, 0x02 },
	},
	[SNDRV_PCM_FORMAT_U18_3BE] = {
		.width = 18, .phys = 24, .le = 0, .signd = 0,
		.silence = { 0x02, 0x00, 0x00 },
	},
	[SNDRV_PCM_FORMAT_G723_24_1B] = {
		.width = 3, .phys = 8, .le = -1, .signd = -1,
		.silence = {},
	},
	[SNDRV_PCM_FORMAT_G723_40_1B] = {
		.width = 5, .phys = 8, .le = -1, .signd = -1,
		.silence = {},
	},
};


/**
 * snd_pcm_format_signed - Check the PCM format is signed linear
 * @format: the format to check
 *
 * Return: 1 if the given PCM format is signed linear, 0 if unsigned
 * linear, and a negative error code for non-linear formats.
 */
int snd_pcm_format_signed(snd_pcm_format_t format)
{
	int val;
	if (!valid_format(format))
		return -EINVAL;
	if ((val = pcm_formats[(INT)format].signd) < 0)
		return -EINVAL;
	return val;
}
EXPORT_SYMBOL(snd_pcm_format_signed);

/**
 * snd_pcm_format_unsigned - Check the PCM format is unsigned linear
 * @format: the format to check
 *
 * Return: 1 if the given PCM format is unsigned linear, 0 if signed
 * linear, and a negative error code for non-linear formats.
 */
int snd_pcm_format_unsigned(snd_pcm_format_t format)
{
	int val;

	val = snd_pcm_format_signed(format);
	if (val < 0)
		return val;
	return !val;
}
EXPORT_SYMBOL(snd_pcm_format_unsigned);

/**
 * snd_pcm_format_linear - Check the PCM format is linear
 * @format: the format to check
 *
 * Return: 1 if the given PCM format is linear, 0 if not.
 */
int snd_pcm_format_linear(snd_pcm_format_t format)
{
	return snd_pcm_format_signed(format) >= 0;
}
EXPORT_SYMBOL(snd_pcm_format_linear);

/**
 * snd_pcm_format_little_endian - Check the PCM format is little-endian
 * @format: the format to check
 *
 * Return: 1 if the given PCM format is little-endian, 0 if
 * big-endian, or a negative error code if endian not specified.
 */
int snd_pcm_format_little_endian(snd_pcm_format_t format)
{
	int val;
	if (!valid_format(format))
		return -EINVAL;
	if ((val = pcm_formats[(INT)format].le) < 0)
		return -EINVAL;
	return val;
}
EXPORT_SYMBOL(snd_pcm_format_little_endian);

/**
 * snd_pcm_format_big_endian - Check the PCM format is big-endian
 * @format: the format to check
 *
 * Return: 1 if the given PCM format is big-endian, 0 if
 * little-endian, or a negative error code if endian not specified.
 */
int snd_pcm_format_big_endian(snd_pcm_format_t format)
{
	int val;

	val = snd_pcm_format_little_endian(format);
	if (val < 0)
		return val;
	return !val;
}
EXPORT_SYMBOL(snd_pcm_format_big_endian);

/**
 * 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 (!valid_format(format))
		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 (!valid_format(format))
		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 (!valid_format(format))
		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;
	const unsigned char *pat;

	if (!valid_format(format))
		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_hw_limit_rates - determine rate_min/rate_max fields
 * @hw: the pcm hw instance
 *
 * Determines the rate_min and rate_max fields from the rates bits of
 * the given hw.
 *
 * Return: Zero if successful.
 */
int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw)
{
	int i;
	for (i = 0; i < (int)snd_pcm_known_rates.count; i++) {
		if (hw->rates & (1 << i)) {
			hw->rate_min = snd_pcm_known_rates.list[i];
			break;
		}
	}
	for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {
		if (hw->rates & (1 << i)) {
			hw->rate_max = snd_pcm_known_rates.list[i];
			break;
		}
	}
	return 0;
}
EXPORT_SYMBOL(snd_pcm_hw_limit_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);
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* PCM Interface - misc routines
c1017a4c	3	* Copyright (c) 1998 by Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	4	*
	5	*
	6	* This library is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU Library General Public License as
	8	* published by the Free Software Foundation; either version 2 of
	9	* the License, or (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU Library General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Library General Public
	17	* License along with this library; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	*/
	21
1da177e4	22	#include <linux/time.h>
d81a6d71	23	#include <linux/export.h>
1da177e4 LT	24	#include <sound/core.h>
1da177e4 LT	25	#include <sound/pcm.h>
2c4842d3 TS	26
	27	#include "pcm_local.h"
	28
1da177e4 LT	29	#define SND_PCM_FORMAT_UNKNOWN (-1)
	30
	31	/* NOTE: "signed" prefix must be given below since the default char is
	32	* unsigned on some architectures!
	33	*/
	34	struct pcm_format_data {
	35	unsigned char width; /* bit width */
	36	unsigned char phys; /* physical bit width */
	37	signed char le; /* 0 = big-endian, 1 = little-endian, -1 = others */
	38	signed char signd; /* 0 = unsigned, 1 = signed, -1 = others */
	39	unsigned char silence[8]; /* silence data to fill */
	40	};
	41
fea952e5 CL	42	/* we do lots of calculations on snd_pcm_format_t; shut up sparse */
	43	#define INT __force int
	44
49d9e43f TI	45	static bool valid_format(snd_pcm_format_t format)
	46	{
	47	return (INT)format >= 0 && (INT)format <= (INT)SNDRV_PCM_FORMAT_LAST;
	48	}
	49
d03af9b8	50	static const struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = {
1da177e4 LT	51	[SNDRV_PCM_FORMAT_S8] = {
	52	.width = 8, .phys = 8, .le = -1, .signd = 1,
	53	.silence = {},
	54	},
	55	[SNDRV_PCM_FORMAT_U8] = {
	56	.width = 8, .phys = 8, .le = -1, .signd = 0,
	57	.silence = { 0x80 },
	58	},
	59	[SNDRV_PCM_FORMAT_S16_LE] = {
	60	.width = 16, .phys = 16, .le = 1, .signd = 1,
	61	.silence = {},
	62	},
	63	[SNDRV_PCM_FORMAT_S16_BE] = {
	64	.width = 16, .phys = 16, .le = 0, .signd = 1,
	65	.silence = {},
	66	},
	67	[SNDRV_PCM_FORMAT_U16_LE] = {
	68	.width = 16, .phys = 16, .le = 1, .signd = 0,
	69	.silence = { 0x00, 0x80 },
	70	},
	71	[SNDRV_PCM_FORMAT_U16_BE] = {
	72	.width = 16, .phys = 16, .le = 0, .signd = 0,
	73	.silence = { 0x80, 0x00 },
	74	},
	75	[SNDRV_PCM_FORMAT_S24_LE] = {
	76	.width = 24, .phys = 32, .le = 1, .signd = 1,
	77	.silence = {},
	78	},
	79	[SNDRV_PCM_FORMAT_S24_BE] = {
	80	.width = 24, .phys = 32, .le = 0, .signd = 1,
	81	.silence = {},
	82	},
	83	[SNDRV_PCM_FORMAT_U24_LE] = {
	84	.width = 24, .phys = 32, .le = 1, .signd = 0,
	85	.silence = { 0x00, 0x00, 0x80 },
	86	},
	87	[SNDRV_PCM_FORMAT_U24_BE] = {
	88	.width = 24, .phys = 32, .le = 0, .signd = 0,
67a7be7e	89	.silence = { 0x00, 0x80, 0x00, 0x00 },
1da177e4 LT	90	},
	91	[SNDRV_PCM_FORMAT_S32_LE] = {
	92	.width = 32, .phys = 32, .le = 1, .signd = 1,
	93	.silence = {},
	94	},
	95	[SNDRV_PCM_FORMAT_S32_BE] = {
	96	.width = 32, .phys = 32, .le = 0, .signd = 1,
	97	.silence = {},
	98	},
	99	[SNDRV_PCM_FORMAT_U32_LE] = {
	100	.width = 32, .phys = 32, .le = 1, .signd = 0,
	101	.silence = { 0x00, 0x00, 0x00, 0x80 },
	102	},
	103	[SNDRV_PCM_FORMAT_U32_BE] = {
	104	.width = 32, .phys = 32, .le = 0, .signd = 0,
	105	.silence = { 0x80, 0x00, 0x00, 0x00 },
	106	},
	107	[SNDRV_PCM_FORMAT_FLOAT_LE] = {
	108	.width = 32, .phys = 32, .le = 1, .signd = -1,
	109	.silence = {},
	110	},
	111	[SNDRV_PCM_FORMAT_FLOAT_BE] = {
	112	.width = 32, .phys = 32, .le = 0, .signd = -1,
	113	.silence = {},
	114	},
	115	[SNDRV_PCM_FORMAT_FLOAT64_LE] = {
	116	.width = 64, .phys = 64, .le = 1, .signd = -1,
	117	.silence = {},
	118	},
	119	[SNDRV_PCM_FORMAT_FLOAT64_BE] = {
	120	.width = 64, .phys = 64, .le = 0, .signd = -1,
	121	.silence = {},
	122	},
	123	[SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE] = {
	124	.width = 32, .phys = 32, .le = 1, .signd = -1,
	125	.silence = {},
	126	},
	127	[SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE] = {
	128	.width = 32, .phys = 32, .le = 0, .signd = -1,
	129	.silence = {},
	130	},
	131	[SNDRV_PCM_FORMAT_MU_LAW] = {
	132	.width = 8, .phys = 8, .le = -1, .signd = -1,
	133	.silence = { 0x7f },
	134	},
	135	[SNDRV_PCM_FORMAT_A_LAW] = {
	136	.width = 8, .phys = 8, .le = -1, .signd = -1,
	137	.silence = { 0x55 },
	138	},
	139	[SNDRV_PCM_FORMAT_IMA_ADPCM] = {
	140	.width = 4, .phys = 4, .le = -1, .signd = -1,
	141	.silence = {},
	142	},
15c0cee6 BC	143	[SNDRV_PCM_FORMAT_G723_24] = {
	144	.width = 3, .phys = 3, .le = -1, .signd = -1,
	145	.silence = {},
	146	},
	147	[SNDRV_PCM_FORMAT_G723_40] = {
	148	.width = 5, .phys = 5, .le = -1, .signd = -1,
	149	.silence = {},
	150	},
ef7a4f97 DM	151	[SNDRV_PCM_FORMAT_DSD_U8] = {
ef7a4f97 DM	152	.width = 8, .phys = 8, .le = 1, .signd = 0,
94a988a8	153	.silence = { 0x69 },
ef7a4f97 DM	154	},
	155	[SNDRV_PCM_FORMAT_DSD_U16_LE] = {
	156	.width = 16, .phys = 16, .le = 1, .signd = 0,
94a988a8	157	.silence = { 0x69, 0x69 },
ef7a4f97	158	},
d4288d3f JK	159	[SNDRV_PCM_FORMAT_DSD_U32_LE] = {
	160	.width = 32, .phys = 32, .le = 1, .signd = 0,
	161	.silence = { 0x69, 0x69, 0x69, 0x69 },
	162	},
d42472ec JL	163	[SNDRV_PCM_FORMAT_DSD_U16_BE] = {
	164	.width = 16, .phys = 16, .le = 0, .signd = 0,
	165	.silence = { 0x69, 0x69 },
	166	},
	167	[SNDRV_PCM_FORMAT_DSD_U32_BE] = {
	168	.width = 32, .phys = 32, .le = 0, .signd = 0,
	169	.silence = { 0x69, 0x69, 0x69, 0x69 },
	170	},
823dbb6e	171	/* FIXME: the following two formats are not defined properly yet */
1da177e4 LT	172	[SNDRV_PCM_FORMAT_MPEG] = {
	173	.le = -1, .signd = -1,
	174	},
	175	[SNDRV_PCM_FORMAT_GSM] = {
	176	.le = -1, .signd = -1,
	177	},
823dbb6e MS	178	[SNDRV_PCM_FORMAT_S20_LE] = {
	179	.width = 20, .phys = 32, .le = 1, .signd = 1,
	180	.silence = {},
	181	},
	182	[SNDRV_PCM_FORMAT_S20_BE] = {
	183	.width = 20, .phys = 32, .le = 0, .signd = 1,
	184	.silence = {},
	185	},
	186	[SNDRV_PCM_FORMAT_U20_LE] = {
	187	.width = 20, .phys = 32, .le = 1, .signd = 0,
	188	.silence = { 0x00, 0x00, 0x08, 0x00 },
	189	},
	190	[SNDRV_PCM_FORMAT_U20_BE] = {
	191	.width = 20, .phys = 32, .le = 0, .signd = 0,
	192	.silence = { 0x00, 0x08, 0x00, 0x00 },
	193	},
	194	/* FIXME: the following format is not defined properly yet */
1da177e4 LT	195	[SNDRV_PCM_FORMAT_SPECIAL] = {
	196	.le = -1, .signd = -1,
	197	},
	198	[SNDRV_PCM_FORMAT_S24_3LE] = {
	199	.width = 24, .phys = 24, .le = 1, .signd = 1,
	200	.silence = {},
	201	},
	202	[SNDRV_PCM_FORMAT_S24_3BE] = {
	203	.width = 24, .phys = 24, .le = 0, .signd = 1,
	204	.silence = {},
	205	},
	206	[SNDRV_PCM_FORMAT_U24_3LE] = {
	207	.width = 24, .phys = 24, .le = 1, .signd = 0,
	208	.silence = { 0x00, 0x00, 0x80 },
	209	},
	210	[SNDRV_PCM_FORMAT_U24_3BE] = {
	211	.width = 24, .phys = 24, .le = 0, .signd = 0,
	212	.silence = { 0x80, 0x00, 0x00 },
	213	},
	214	[SNDRV_PCM_FORMAT_S20_3LE] = {
	215	.width = 20, .phys = 24, .le = 1, .signd = 1,
	216	.silence = {},
	217	},
	218	[SNDRV_PCM_FORMAT_S20_3BE] = {
	219	.width = 20, .phys = 24, .le = 0, .signd = 1,
	220	.silence = {},
	221	},
	222	[SNDRV_PCM_FORMAT_U20_3LE] = {
	223	.width = 20, .phys = 24, .le = 1, .signd = 0,
	224	.silence = { 0x00, 0x00, 0x08 },
	225	},
	226	[SNDRV_PCM_FORMAT_U20_3BE] = {
	227	.width = 20, .phys = 24, .le = 0, .signd = 0,
	228	.silence = { 0x08, 0x00, 0x00 },
	229	},
	230	[SNDRV_PCM_FORMAT_S18_3LE] = {
	231	.width = 18, .phys = 24, .le = 1, .signd = 1,
	232	.silence = {},
	233	},
	234	[SNDRV_PCM_FORMAT_S18_3BE] = {
	235	.width = 18, .phys = 24, .le = 0, .signd = 1,
	236	.silence = {},
	237	},
	238	[SNDRV_PCM_FORMAT_U18_3LE] = {
	239	.width = 18, .phys = 24, .le = 1, .signd = 0,
	240	.silence = { 0x00, 0x00, 0x02 },
	241	},
	242	[SNDRV_PCM_FORMAT_U18_3BE] = {
	243	.width = 18, .phys = 24, .le = 0, .signd = 0,
	244	.silence = { 0x02, 0x00, 0x00 },
	245	},
15c0cee6 BC	246	[SNDRV_PCM_FORMAT_G723_24_1B] = {
	247	.width = 3, .phys = 8, .le = -1, .signd = -1,
	248	.silence = {},
	249	},
	250	[SNDRV_PCM_FORMAT_G723_40_1B] = {
	251	.width = 5, .phys = 8, .le = -1, .signd = -1,
	252	.silence = {},
	253	},
1da177e4 LT	254	};
	255
	256
	257	/**
	258	* snd_pcm_format_signed - Check the PCM format is signed linear
	259	* @format: the format to check
	260	*
eb7c06e8	261	* Return: 1 if the given PCM format is signed linear, 0 if unsigned
1da177e4 LT	262	* linear, and a negative error code for non-linear formats.
	263	*/
	264	int snd_pcm_format_signed(snd_pcm_format_t format)
	265	{
	266	int val;
49d9e43f	267	if (!valid_format(format))
1da177e4	268	return -EINVAL;
fea952e5	269	if ((val = pcm_formats[(INT)format].signd) < 0)
1da177e4 LT	270	return -EINVAL;
	271	return val;
	272	}
e88e8ae6 TI	273	EXPORT_SYMBOL(snd_pcm_format_signed);
e88e8ae6 TI	274
1da177e4 LT	275	/**
	276	* snd_pcm_format_unsigned - Check the PCM format is unsigned linear
	277	* @format: the format to check
	278	*
eb7c06e8	279	* Return: 1 if the given PCM format is unsigned linear, 0 if signed
1da177e4 LT	280	* linear, and a negative error code for non-linear formats.
	281	*/
	282	int snd_pcm_format_unsigned(snd_pcm_format_t format)
	283	{
	284	int val;
	285
	286	val = snd_pcm_format_signed(format);
	287	if (val < 0)
	288	return val;
	289	return !val;
	290	}
e88e8ae6 TI	291	EXPORT_SYMBOL(snd_pcm_format_unsigned);
e88e8ae6 TI	292
1da177e4 LT	293	/**
	294	* snd_pcm_format_linear - Check the PCM format is linear
	295	* @format: the format to check
	296	*
eb7c06e8	297	* Return: 1 if the given PCM format is linear, 0 if not.
1da177e4 LT	298	*/
	299	int snd_pcm_format_linear(snd_pcm_format_t format)
	300	{
	301	return snd_pcm_format_signed(format) >= 0;
	302	}
e88e8ae6 TI	303	EXPORT_SYMBOL(snd_pcm_format_linear);
e88e8ae6 TI	304
1da177e4 LT	305	/**
	306	* snd_pcm_format_little_endian - Check the PCM format is little-endian
	307	* @format: the format to check
	308	*
eb7c06e8	309	* Return: 1 if the given PCM format is little-endian, 0 if
1da177e4 LT	310	* big-endian, or a negative error code if endian not specified.
	311	*/
	312	int snd_pcm_format_little_endian(snd_pcm_format_t format)
	313	{
	314	int val;
49d9e43f	315	if (!valid_format(format))
1da177e4	316	return -EINVAL;
fea952e5	317	if ((val = pcm_formats[(INT)format].le) < 0)
1da177e4 LT	318	return -EINVAL;
	319	return val;
	320	}
e88e8ae6 TI	321	EXPORT_SYMBOL(snd_pcm_format_little_endian);
e88e8ae6 TI	322
1da177e4 LT	323	/**
	324	* snd_pcm_format_big_endian - Check the PCM format is big-endian
	325	* @format: the format to check
	326	*
eb7c06e8	327	* Return: 1 if the given PCM format is big-endian, 0 if
1da177e4 LT	328	* little-endian, or a negative error code if endian not specified.
	329	*/
	330	int snd_pcm_format_big_endian(snd_pcm_format_t format)
	331	{
	332	int val;
	333
	334	val = snd_pcm_format_little_endian(format);
	335	if (val < 0)
	336	return val;
	337	return !val;
	338	}
e88e8ae6 TI	339	EXPORT_SYMBOL(snd_pcm_format_big_endian);
e88e8ae6 TI	340
1da177e4 LT	341	/**
	342	* snd_pcm_format_width - return the bit-width of the format
	343	* @format: the format to check
	344	*
eb7c06e8	345	* Return: The bit-width of the format, or a negative error code
1da177e4 LT	346	* if unknown format.
	347	*/
	348	int snd_pcm_format_width(snd_pcm_format_t format)
	349	{
	350	int val;
49d9e43f	351	if (!valid_format(format))
1da177e4	352	return -EINVAL;
fea952e5	353	if ((val = pcm_formats[(INT)format].width) == 0)
1da177e4 LT	354	return -EINVAL;
	355	return val;
	356	}
e88e8ae6 TI	357	EXPORT_SYMBOL(snd_pcm_format_width);
e88e8ae6 TI	358
1da177e4 LT	359	/**
	360	* snd_pcm_format_physical_width - return the physical bit-width of the format
	361	* @format: the format to check
	362	*
eb7c06e8	363	* Return: The physical bit-width of the format, or a negative error code
1da177e4 LT	364	* if unknown format.
	365	*/
	366	int snd_pcm_format_physical_width(snd_pcm_format_t format)
	367	{
	368	int val;
49d9e43f	369	if (!valid_format(format))
1da177e4	370	return -EINVAL;
fea952e5	371	if ((val = pcm_formats[(INT)format].phys) == 0)
1da177e4 LT	372	return -EINVAL;
	373	return val;
	374	}
e88e8ae6 TI	375	EXPORT_SYMBOL(snd_pcm_format_physical_width);
e88e8ae6 TI	376
1da177e4 LT	377	/**
	378	* snd_pcm_format_size - return the byte size of samples on the given format
	379	* @format: the format to check
a66547f3	380	* @samples: sampling rate
1da177e4	381	*
eb7c06e8	382	* Return: The byte size of the given samples for the format, or a
1da177e4 LT	383	* negative error code if unknown format.
	384	*/
	385	ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)
	386	{
	387	int phys_width = snd_pcm_format_physical_width(format);
	388	if (phys_width < 0)
	389	return -EINVAL;
	390	return samples * phys_width / 8;
	391	}
e88e8ae6 TI	392	EXPORT_SYMBOL(snd_pcm_format_size);
e88e8ae6 TI	393
1da177e4 LT	394	/**
	395	* snd_pcm_format_silence_64 - return the silent data in 8 bytes array
	396	* @format: the format to check
	397	*
eb7c06e8	398	* Return: The format pattern to fill or %NULL if error.
1da177e4 LT	399	*/
	400	const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format)
	401	{
49d9e43f	402	if (!valid_format(format))
1da177e4	403	return NULL;
fea952e5	404	if (! pcm_formats[(INT)format].phys)
1da177e4	405	return NULL;
fea952e5	406	return pcm_formats[(INT)format].silence;
1da177e4	407	}
e88e8ae6 TI	408	EXPORT_SYMBOL(snd_pcm_format_silence_64);
e88e8ae6 TI	409
1da177e4 LT	410	/**
	411	* snd_pcm_format_set_silence - set the silence data on the buffer
	412	* @format: the PCM format
	413	* @data: the buffer pointer
	414	* @samples: the number of samples to set silence
	415	*
	416	* Sets the silence data on the buffer for the given samples.
	417	*
eb7c06e8	418	* Return: Zero if successful, or a negative error code on failure.
1da177e4 LT	419	*/
	420	int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
	421	{
	422	int width;
d03af9b8 TI	423	unsigned char *dst;
d03af9b8 TI	424	const unsigned char *pat;
1da177e4	425
49d9e43f	426	if (!valid_format(format))
1da177e4 LT	427	return -EINVAL;
	428	if (samples == 0)
	429	return 0;
fea952e5 CL	430	width = pcm_formats[(INT)format].phys; /* physical width */
fea952e5 CL	431	pat = pcm_formats[(INT)format].silence;
1da177e4 LT	432	if (! width)
	433	return -EINVAL;
	434	/* signed or 1 byte data */
fea952e5	435	if (pcm_formats[(INT)format].signd == 1 \|\| width <= 8) {
1da177e4 LT	436	unsigned int bytes = samples * width / 8;
	437	memset(data, *pat, bytes);
	438	return 0;
	439	}
	440	/* non-zero samples, fill using a loop */
	441	width /= 8;
	442	dst = data;
	443	#if 0
	444	while (samples--) {
	445	memcpy(dst, pat, width);
	446	dst += width;
	447	}
	448	#else
	449	/* a bit optimization for constant width */
	450	switch (width) {
	451	case 2:
	452	while (samples--) {
	453	memcpy(dst, pat, 2);
	454	dst += 2;
	455	}
	456	break;
	457	case 3:
	458	while (samples--) {
	459	memcpy(dst, pat, 3);
	460	dst += 3;
	461	}
	462	break;
	463	case 4:
	464	while (samples--) {
	465	memcpy(dst, pat, 4);
	466	dst += 4;
	467	}
	468	break;
	469	case 8:
	470	while (samples--) {
	471	memcpy(dst, pat, 8);
	472	dst += 8;
	473	}
	474	break;
	475	}
	476	#endif
	477	return 0;
	478	}
e88e8ae6 TI	479	EXPORT_SYMBOL(snd_pcm_format_set_silence);
e88e8ae6 TI	480
1da177e4	481	/**
4769bfb9 SH	482	* snd_pcm_hw_limit_rates - determine rate_min/rate_max fields
4769bfb9 SH	483	* @hw: the pcm hw instance
1da177e4 LT	484	*
1da177e4 LT	485	* Determines the rate_min and rate_max fields from the rates bits of
4769bfb9	486	* the given hw.
1da177e4	487	*
eb7c06e8	488	* Return: Zero if successful.
1da177e4	489	*/
4769bfb9	490	int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw)
1da177e4	491	{
1da177e4	492	int i;
7653d557	493	for (i = 0; i < (int)snd_pcm_known_rates.count; i++) {
4769bfb9 SH	494	if (hw->rates & (1 << i)) {
4769bfb9 SH	495	hw->rate_min = snd_pcm_known_rates.list[i];
1da177e4 LT	496	break;
	497	}
	498	}
7653d557	499	for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {
4769bfb9 SH	500	if (hw->rates & (1 << i)) {
4769bfb9 SH	501	hw->rate_max = snd_pcm_known_rates.list[i];
1da177e4 LT	502	break;
	503	}
	504	}
	505	return 0;
	506	}
4769bfb9	507	EXPORT_SYMBOL(snd_pcm_hw_limit_rates);
918f3a0e CL	508
	509	/**
	510	* snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
	511	* @rate: the sample rate to convert
	512	*
eb7c06e8	513	* Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or
918f3a0e CL	514	* SNDRV_PCM_RATE_KNOT for an unknown rate.
	515	*/
	516	unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate)
	517	{
	518	unsigned int i;
	519
	520	for (i = 0; i < snd_pcm_known_rates.count; i++)
	521	if (snd_pcm_known_rates.list[i] == rate)
	522	return 1u << i;
	523	return SNDRV_PCM_RATE_KNOT;
	524	}
	525	EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit);
4be77a53 DP	526
	527	/**
	528	* snd_pcm_rate_bit_to_rate - converts SNDRV_PCM_RATE_xxx bit to sample rate
	529	* @rate_bit: the rate bit to convert
	530	*
eb7c06e8 YB	531	* Return: The sample rate that corresponds to the given SNDRV_PCM_RATE_xxx flag
eb7c06e8 YB	532	* or 0 for an unknown rate bit.
4be77a53 DP	533	*/
	534	unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit)
	535	{
	536	unsigned int i;
	537
	538	for (i = 0; i < snd_pcm_known_rates.count; i++)
	539	if ((1u << i) == rate_bit)
	540	return snd_pcm_known_rates.list[i];
	541	return 0;
	542	}
	543	EXPORT_SYMBOL(snd_pcm_rate_bit_to_rate);
e3a9269f LPC	544
	545	static unsigned int snd_pcm_rate_mask_sanitize(unsigned int rates)
	546	{
	547	if (rates & SNDRV_PCM_RATE_CONTINUOUS)
	548	return SNDRV_PCM_RATE_CONTINUOUS;
	549	else if (rates & SNDRV_PCM_RATE_KNOT)
	550	return SNDRV_PCM_RATE_KNOT;
	551	return rates;
	552	}
	553
	554	/**
	555	* snd_pcm_rate_mask_intersect - computes the intersection between two rate masks
	556	* @rates_a: The first rate mask
	557	* @rates_b: The second rate mask
	558	*
	559	* This function computes the rates that are supported by both rate masks passed
	560	* to the function. It will take care of the special handling of
	561	* SNDRV_PCM_RATE_CONTINUOUS and SNDRV_PCM_RATE_KNOT.
	562	*
	563	* Return: A rate mask containing the rates that are supported by both rates_a
	564	* and rates_b.
	565	*/
	566	unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
	567	unsigned int rates_b)
	568	{
	569	rates_a = snd_pcm_rate_mask_sanitize(rates_a);
	570	rates_b = snd_pcm_rate_mask_sanitize(rates_b);
	571
	572	if (rates_a & SNDRV_PCM_RATE_CONTINUOUS)
	573	return rates_b;
	574	else if (rates_b & SNDRV_PCM_RATE_CONTINUOUS)
	575	return rates_a;
	576	else if (rates_a & SNDRV_PCM_RATE_KNOT)
	577	return rates_b;
	578	else if (rates_b & SNDRV_PCM_RATE_KNOT)
	579	return rates_a;
	580	return rates_a & rates_b;
	581	}
	582	EXPORT_SYMBOL_GPL(snd_pcm_rate_mask_intersect);
3bdff244 ML	583
	584	/**
	585	* snd_pcm_rate_range_to_bits - converts rate range to SNDRV_PCM_RATE_xxx bit
	586	* @rate_min: the minimum sample rate
	587	* @rate_max: the maximum sample rate
	588	*
	589	* This function has an implicit assumption: the rates in the given range have
	590	* only the pre-defined rates like 44100 or 16000.
	591	*
	592	* Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate range,
	593	* or SNDRV_PCM_RATE_KNOT for an unknown range.
	594	*/
	595	unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
	596	unsigned int rate_max)
	597	{
	598	unsigned int rates = 0;
	599	int i;
	600
	601	for (i = 0; i < snd_pcm_known_rates.count; i++) {
	602	if (snd_pcm_known_rates.list[i] >= rate_min
	603	&& snd_pcm_known_rates.list[i] <= rate_max)
	604	rates \|= 1 << i;
	605	}
	606
	607	if (!rates)
	608	rates = SNDRV_PCM_RATE_KNOT;
	609
	610	return rates;
	611	}
	612	EXPORT_SYMBOL_GPL(snd_pcm_rate_range_to_bits);