[GitHub/mt8127/android_kernel_alcatel_ttab.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 <sound/core.h>
#include <sound/pcm.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 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 = {},
	},
	/* FIXME: the following three 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_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
 *
 * Returns 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 ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
		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
 *
 * Returns 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
 *
 * Returns 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
 *
 * Returns 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 ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
		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
 *
 * Returns 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
 *
 * Returns 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
 *
 * Returns 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
 *
 * Returns 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
 *
 * Returns 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.
 *
 * Returns 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.
 *
 * Returns 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
 *
 * Returns 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);
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 LT	22	#include <linux/time.h>
	23	#include <sound/core.h>
	24	#include <sound/pcm.h>
	25	#define SND_PCM_FORMAT_UNKNOWN (-1)
	26
	27	/* NOTE: "signed" prefix must be given below since the default char is
	28	* unsigned on some architectures!
	29	*/
	30	struct pcm_format_data {
	31	unsigned char width; /* bit width */
	32	unsigned char phys; /* physical bit width */
	33	signed char le; /* 0 = big-endian, 1 = little-endian, -1 = others */
	34	signed char signd; /* 0 = unsigned, 1 = signed, -1 = others */
	35	unsigned char silence[8]; /* silence data to fill */
	36	};
	37
fea952e5 CL	38	/* we do lots of calculations on snd_pcm_format_t; shut up sparse */
	39	#define INT __force int
	40
	41	static struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = {
1da177e4 LT	42	[SNDRV_PCM_FORMAT_S8] = {
	43	.width = 8, .phys = 8, .le = -1, .signd = 1,
	44	.silence = {},
	45	},
	46	[SNDRV_PCM_FORMAT_U8] = {
	47	.width = 8, .phys = 8, .le = -1, .signd = 0,
	48	.silence = { 0x80 },
	49	},
	50	[SNDRV_PCM_FORMAT_S16_LE] = {
	51	.width = 16, .phys = 16, .le = 1, .signd = 1,
	52	.silence = {},
	53	},
	54	[SNDRV_PCM_FORMAT_S16_BE] = {
	55	.width = 16, .phys = 16, .le = 0, .signd = 1,
	56	.silence = {},
	57	},
	58	[SNDRV_PCM_FORMAT_U16_LE] = {
	59	.width = 16, .phys = 16, .le = 1, .signd = 0,
	60	.silence = { 0x00, 0x80 },
	61	},
	62	[SNDRV_PCM_FORMAT_U16_BE] = {
	63	.width = 16, .phys = 16, .le = 0, .signd = 0,
	64	.silence = { 0x80, 0x00 },
	65	},
	66	[SNDRV_PCM_FORMAT_S24_LE] = {
	67	.width = 24, .phys = 32, .le = 1, .signd = 1,
	68	.silence = {},
	69	},
	70	[SNDRV_PCM_FORMAT_S24_BE] = {
	71	.width = 24, .phys = 32, .le = 0, .signd = 1,
	72	.silence = {},
	73	},
	74	[SNDRV_PCM_FORMAT_U24_LE] = {
	75	.width = 24, .phys = 32, .le = 1, .signd = 0,
	76	.silence = { 0x00, 0x00, 0x80 },
	77	},
	78	[SNDRV_PCM_FORMAT_U24_BE] = {
	79	.width = 24, .phys = 32, .le = 0, .signd = 0,
67a7be7e	80	.silence = { 0x00, 0x80, 0x00, 0x00 },
1da177e4 LT	81	},
	82	[SNDRV_PCM_FORMAT_S32_LE] = {
	83	.width = 32, .phys = 32, .le = 1, .signd = 1,
	84	.silence = {},
	85	},
	86	[SNDRV_PCM_FORMAT_S32_BE] = {
	87	.width = 32, .phys = 32, .le = 0, .signd = 1,
	88	.silence = {},
	89	},
	90	[SNDRV_PCM_FORMAT_U32_LE] = {
	91	.width = 32, .phys = 32, .le = 1, .signd = 0,
	92	.silence = { 0x00, 0x00, 0x00, 0x80 },
	93	},
	94	[SNDRV_PCM_FORMAT_U32_BE] = {
	95	.width = 32, .phys = 32, .le = 0, .signd = 0,
	96	.silence = { 0x80, 0x00, 0x00, 0x00 },
	97	},
	98	[SNDRV_PCM_FORMAT_FLOAT_LE] = {
	99	.width = 32, .phys = 32, .le = 1, .signd = -1,
	100	.silence = {},
	101	},
	102	[SNDRV_PCM_FORMAT_FLOAT_BE] = {
	103	.width = 32, .phys = 32, .le = 0, .signd = -1,
	104	.silence = {},
	105	},
	106	[SNDRV_PCM_FORMAT_FLOAT64_LE] = {
	107	.width = 64, .phys = 64, .le = 1, .signd = -1,
	108	.silence = {},
	109	},
	110	[SNDRV_PCM_FORMAT_FLOAT64_BE] = {
	111	.width = 64, .phys = 64, .le = 0, .signd = -1,
	112	.silence = {},
	113	},
	114	[SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE] = {
	115	.width = 32, .phys = 32, .le = 1, .signd = -1,
	116	.silence = {},
	117	},
	118	[SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE] = {
	119	.width = 32, .phys = 32, .le = 0, .signd = -1,
	120	.silence = {},
	121	},
	122	[SNDRV_PCM_FORMAT_MU_LAW] = {
	123	.width = 8, .phys = 8, .le = -1, .signd = -1,
	124	.silence = { 0x7f },
	125	},
	126	[SNDRV_PCM_FORMAT_A_LAW] = {
	127	.width = 8, .phys = 8, .le = -1, .signd = -1,
	128	.silence = { 0x55 },
	129	},
	130	[SNDRV_PCM_FORMAT_IMA_ADPCM] = {
	131	.width = 4, .phys = 4, .le = -1, .signd = -1,
	132	.silence = {},
	133	},
15c0cee6 BC	134	[SNDRV_PCM_FORMAT_G723_24] = {
	135	.width = 3, .phys = 3, .le = -1, .signd = -1,
	136	.silence = {},
	137	},
	138	[SNDRV_PCM_FORMAT_G723_40] = {
	139	.width = 5, .phys = 5, .le = -1, .signd = -1,
	140	.silence = {},
	141	},
1da177e4 LT	142	/* FIXME: the following three formats are not defined properly yet */
	143	[SNDRV_PCM_FORMAT_MPEG] = {
	144	.le = -1, .signd = -1,
	145	},
	146	[SNDRV_PCM_FORMAT_GSM] = {
	147	.le = -1, .signd = -1,
	148	},
	149	[SNDRV_PCM_FORMAT_SPECIAL] = {
	150	.le = -1, .signd = -1,
	151	},
	152	[SNDRV_PCM_FORMAT_S24_3LE] = {
	153	.width = 24, .phys = 24, .le = 1, .signd = 1,
	154	.silence = {},
	155	},
	156	[SNDRV_PCM_FORMAT_S24_3BE] = {
	157	.width = 24, .phys = 24, .le = 0, .signd = 1,
	158	.silence = {},
	159	},
	160	[SNDRV_PCM_FORMAT_U24_3LE] = {
	161	.width = 24, .phys = 24, .le = 1, .signd = 0,
	162	.silence = { 0x00, 0x00, 0x80 },
	163	},
	164	[SNDRV_PCM_FORMAT_U24_3BE] = {
	165	.width = 24, .phys = 24, .le = 0, .signd = 0,
	166	.silence = { 0x80, 0x00, 0x00 },
	167	},
	168	[SNDRV_PCM_FORMAT_S20_3LE] = {
	169	.width = 20, .phys = 24, .le = 1, .signd = 1,
	170	.silence = {},
	171	},
	172	[SNDRV_PCM_FORMAT_S20_3BE] = {
	173	.width = 20, .phys = 24, .le = 0, .signd = 1,
	174	.silence = {},
	175	},
	176	[SNDRV_PCM_FORMAT_U20_3LE] = {
	177	.width = 20, .phys = 24, .le = 1, .signd = 0,
	178	.silence = { 0x00, 0x00, 0x08 },
	179	},
	180	[SNDRV_PCM_FORMAT_U20_3BE] = {
	181	.width = 20, .phys = 24, .le = 0, .signd = 0,
	182	.silence = { 0x08, 0x00, 0x00 },
	183	},
	184	[SNDRV_PCM_FORMAT_S18_3LE] = {
	185	.width = 18, .phys = 24, .le = 1, .signd = 1,
	186	.silence = {},
	187	},
	188	[SNDRV_PCM_FORMAT_S18_3BE] = {
	189	.width = 18, .phys = 24, .le = 0, .signd = 1,
	190	.silence = {},
	191	},
	192	[SNDRV_PCM_FORMAT_U18_3LE] = {
	193	.width = 18, .phys = 24, .le = 1, .signd = 0,
	194	.silence = { 0x00, 0x00, 0x02 },
	195	},
	196	[SNDRV_PCM_FORMAT_U18_3BE] = {
	197	.width = 18, .phys = 24, .le = 0, .signd = 0,
	198	.silence = { 0x02, 0x00, 0x00 },
	199	},
15c0cee6 BC	200	[SNDRV_PCM_FORMAT_G723_24_1B] = {
	201	.width = 3, .phys = 8, .le = -1, .signd = -1,
	202	.silence = {},
	203	},
	204	[SNDRV_PCM_FORMAT_G723_40_1B] = {
	205	.width = 5, .phys = 8, .le = -1, .signd = -1,
	206	.silence = {},
	207	},
1da177e4 LT	208	};
	209
	210
	211	/**
	212	* snd_pcm_format_signed - Check the PCM format is signed linear
	213	* @format: the format to check
	214	*
	215	* Returns 1 if the given PCM format is signed linear, 0 if unsigned
	216	* linear, and a negative error code for non-linear formats.
	217	*/
	218	int snd_pcm_format_signed(snd_pcm_format_t format)
	219	{
	220	int val;
fea952e5	221	if ((INT)format < 0 \|\| (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
1da177e4	222	return -EINVAL;
fea952e5	223	if ((val = pcm_formats[(INT)format].signd) < 0)
1da177e4 LT	224	return -EINVAL;
	225	return val;
	226	}
	227
e88e8ae6 TI	228	EXPORT_SYMBOL(snd_pcm_format_signed);
e88e8ae6 TI	229
1da177e4 LT	230	/**
	231	* snd_pcm_format_unsigned - Check the PCM format is unsigned linear
	232	* @format: the format to check
	233	*
	234	* Returns 1 if the given PCM format is unsigned linear, 0 if signed
	235	* linear, and a negative error code for non-linear formats.
	236	*/
	237	int snd_pcm_format_unsigned(snd_pcm_format_t format)
	238	{
	239	int val;
	240
	241	val = snd_pcm_format_signed(format);
	242	if (val < 0)
	243	return val;
	244	return !val;
	245	}
	246
e88e8ae6 TI	247	EXPORT_SYMBOL(snd_pcm_format_unsigned);
e88e8ae6 TI	248
1da177e4 LT	249	/**
	250	* snd_pcm_format_linear - Check the PCM format is linear
	251	* @format: the format to check
	252	*
	253	* Returns 1 if the given PCM format is linear, 0 if not.
	254	*/
	255	int snd_pcm_format_linear(snd_pcm_format_t format)
	256	{
	257	return snd_pcm_format_signed(format) >= 0;
	258	}
	259
e88e8ae6 TI	260	EXPORT_SYMBOL(snd_pcm_format_linear);
e88e8ae6 TI	261
1da177e4 LT	262	/**
	263	* snd_pcm_format_little_endian - Check the PCM format is little-endian
	264	* @format: the format to check
	265	*
	266	* Returns 1 if the given PCM format is little-endian, 0 if
	267	* big-endian, or a negative error code if endian not specified.
	268	*/
	269	int snd_pcm_format_little_endian(snd_pcm_format_t format)
	270	{
	271	int val;
fea952e5	272	if ((INT)format < 0 \|\| (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
1da177e4	273	return -EINVAL;
fea952e5	274	if ((val = pcm_formats[(INT)format].le) < 0)
1da177e4 LT	275	return -EINVAL;
	276	return val;
	277	}
	278
e88e8ae6 TI	279	EXPORT_SYMBOL(snd_pcm_format_little_endian);
e88e8ae6 TI	280
1da177e4 LT	281	/**
	282	* snd_pcm_format_big_endian - Check the PCM format is big-endian
	283	* @format: the format to check
	284	*
	285	* Returns 1 if the given PCM format is big-endian, 0 if
	286	* little-endian, or a negative error code if endian not specified.
	287	*/
	288	int snd_pcm_format_big_endian(snd_pcm_format_t format)
	289	{
	290	int val;
	291
	292	val = snd_pcm_format_little_endian(format);
	293	if (val < 0)
	294	return val;
	295	return !val;
	296	}
	297
e88e8ae6 TI	298	EXPORT_SYMBOL(snd_pcm_format_big_endian);
e88e8ae6 TI	299
1da177e4 LT	300	/**
	301	* snd_pcm_format_width - return the bit-width of the format
	302	* @format: the format to check
	303	*
	304	* Returns the bit-width of the format, or a negative error code
	305	* if unknown format.
	306	*/
	307	int snd_pcm_format_width(snd_pcm_format_t format)
	308	{
	309	int val;
fea952e5	310	if ((INT)format < 0 \|\| (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
1da177e4	311	return -EINVAL;
fea952e5	312	if ((val = pcm_formats[(INT)format].width) == 0)
1da177e4 LT	313	return -EINVAL;
	314	return val;
	315	}
	316
e88e8ae6 TI	317	EXPORT_SYMBOL(snd_pcm_format_width);
e88e8ae6 TI	318
1da177e4 LT	319	/**
	320	* snd_pcm_format_physical_width - return the physical bit-width of the format
	321	* @format: the format to check
	322	*
	323	* Returns the physical bit-width of the format, or a negative error code
	324	* if unknown format.
	325	*/
	326	int snd_pcm_format_physical_width(snd_pcm_format_t format)
	327	{
	328	int val;
fea952e5	329	if ((INT)format < 0 \|\| (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
1da177e4	330	return -EINVAL;
fea952e5	331	if ((val = pcm_formats[(INT)format].phys) == 0)
1da177e4 LT	332	return -EINVAL;
	333	return val;
	334	}
	335
e88e8ae6 TI	336	EXPORT_SYMBOL(snd_pcm_format_physical_width);
e88e8ae6 TI	337
1da177e4 LT	338	/**
	339	* snd_pcm_format_size - return the byte size of samples on the given format
	340	* @format: the format to check
a66547f3	341	* @samples: sampling rate
1da177e4 LT	342	*
	343	* Returns the byte size of the given samples for the format, or a
	344	* negative error code if unknown format.
	345	*/
	346	ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)
	347	{
	348	int phys_width = snd_pcm_format_physical_width(format);
	349	if (phys_width < 0)
	350	return -EINVAL;
	351	return samples * phys_width / 8;
	352	}
	353
e88e8ae6 TI	354	EXPORT_SYMBOL(snd_pcm_format_size);
e88e8ae6 TI	355
1da177e4 LT	356	/**
	357	* snd_pcm_format_silence_64 - return the silent data in 8 bytes array
	358	* @format: the format to check
	359	*
	360	* Returns the format pattern to fill or NULL if error.
	361	*/
	362	const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format)
	363	{
fea952e5	364	if ((INT)format < 0 \|\| (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
1da177e4	365	return NULL;
fea952e5	366	if (! pcm_formats[(INT)format].phys)
1da177e4	367	return NULL;
fea952e5	368	return pcm_formats[(INT)format].silence;
1da177e4 LT	369	}
1da177e4 LT	370
e88e8ae6 TI	371	EXPORT_SYMBOL(snd_pcm_format_silence_64);
e88e8ae6 TI	372
1da177e4 LT	373	/**
	374	* snd_pcm_format_set_silence - set the silence data on the buffer
	375	* @format: the PCM format
	376	* @data: the buffer pointer
	377	* @samples: the number of samples to set silence
	378	*
	379	* Sets the silence data on the buffer for the given samples.
	380	*
	381	* Returns zero if successful, or a negative error code on failure.
	382	*/
	383	int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
	384	{
	385	int width;
	386	unsigned char dst, pat;
	387
fea952e5	388	if ((INT)format < 0 \|\| (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
1da177e4 LT	389	return -EINVAL;
	390	if (samples == 0)
	391	return 0;
fea952e5 CL	392	width = pcm_formats[(INT)format].phys; /* physical width */
fea952e5 CL	393	pat = pcm_formats[(INT)format].silence;
1da177e4 LT	394	if (! width)
	395	return -EINVAL;
	396	/* signed or 1 byte data */
fea952e5	397	if (pcm_formats[(INT)format].signd == 1 \|\| width <= 8) {
1da177e4 LT	398	unsigned int bytes = samples * width / 8;
	399	memset(data, *pat, bytes);
	400	return 0;
	401	}
	402	/* non-zero samples, fill using a loop */
	403	width /= 8;
	404	dst = data;
	405	#if 0
	406	while (samples--) {
	407	memcpy(dst, pat, width);
	408	dst += width;
	409	}
	410	#else
	411	/* a bit optimization for constant width */
	412	switch (width) {
	413	case 2:
	414	while (samples--) {
	415	memcpy(dst, pat, 2);
	416	dst += 2;
	417	}
	418	break;
	419	case 3:
	420	while (samples--) {
	421	memcpy(dst, pat, 3);
	422	dst += 3;
	423	}
	424	break;
	425	case 4:
	426	while (samples--) {
	427	memcpy(dst, pat, 4);
	428	dst += 4;
	429	}
	430	break;
	431	case 8:
	432	while (samples--) {
	433	memcpy(dst, pat, 8);
	434	dst += 8;
	435	}
	436	break;
	437	}
	438	#endif
	439	return 0;
	440	}
	441
e88e8ae6 TI	442	EXPORT_SYMBOL(snd_pcm_format_set_silence);
e88e8ae6 TI	443
1da177e4 LT	444	/**
	445	* snd_pcm_limit_hw_rates - determine rate_min/rate_max fields
	446	* @runtime: the runtime instance
	447	*
	448	* Determines the rate_min and rate_max fields from the rates bits of
	449	* the given runtime->hw.
	450	*
	451	* Returns zero if successful.
	452	*/
877211f5	453	int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
1da177e4	454	{
1da177e4	455	int i;
7653d557	456	for (i = 0; i < (int)snd_pcm_known_rates.count; i++) {
1da177e4	457	if (runtime->hw.rates & (1 << i)) {
7653d557	458	runtime->hw.rate_min = snd_pcm_known_rates.list[i];
1da177e4 LT	459	break;
	460	}
	461	}
7653d557	462	for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {
1da177e4	463	if (runtime->hw.rates & (1 << i)) {
7653d557	464	runtime->hw.rate_max = snd_pcm_known_rates.list[i];
1da177e4 LT	465	break;
	466	}
	467	}
	468	return 0;
	469	}
e88e8ae6 TI	470
e88e8ae6 TI	471	EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
918f3a0e CL	472
	473	/**
	474	* snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
	475	* @rate: the sample rate to convert
	476	*
	477	* Returns the SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or
	478	* SNDRV_PCM_RATE_KNOT for an unknown rate.
	479	*/
	480	unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate)
	481	{
	482	unsigned int i;
	483
	484	for (i = 0; i < snd_pcm_known_rates.count; i++)
	485	if (snd_pcm_known_rates.list[i] == rate)
	486	return 1u << i;
	487	return SNDRV_PCM_RATE_KNOT;
	488	}
	489	EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit);