[net-next-2.6.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 */
};

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