[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 <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 = {},
	},
	/* 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 },
	},
};


/**
 * 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	},
	131	/* FIXME: the following three formats are not defined properly yet */
	132	[SNDRV_PCM_FORMAT_MPEG] = {
	133	.le = -1, .signd = -1,
	134	},
	135	[SNDRV_PCM_FORMAT_GSM] = {
	136	.le = -1, .signd = -1,
	137	},
	138	[SNDRV_PCM_FORMAT_SPECIAL] = {
	139	.le = -1, .signd = -1,
	140	},
	141	[SNDRV_PCM_FORMAT_S24_3LE] = {
142	.width = 24, .phys = 24, .le = 1, .signd = 1,
143	.silence = {},
144	},
145	[SNDRV_PCM_FORMAT_S24_3BE] = {
146	.width = 24, .phys = 24, .le = 0, .signd = 1,
147	.silence = {},
148	},
149	[SNDRV_PCM_FORMAT_U24_3LE] = {
150	.width = 24, .phys = 24, .le = 1, .signd = 0,
151	.silence = { 0x00, 0x00, 0x80 },
152	},
153	[SNDRV_PCM_FORMAT_U24_3BE] = {
154	.width = 24, .phys = 24, .le = 0, .signd = 0,
155	.silence = { 0x80, 0x00, 0x00 },
156	},
157	[SNDRV_PCM_FORMAT_S20_3LE] = {
158	.width = 20, .phys = 24, .le = 1, .signd = 1,
159	.silence = {},
160	},
161	[SNDRV_PCM_FORMAT_S20_3BE] = {
162	.width = 20, .phys = 24, .le = 0, .signd = 1,
163	.silence = {},
164	},
165	[SNDRV_PCM_FORMAT_U20_3LE] = {
166	.width = 20, .phys = 24, .le = 1, .signd = 0,
167	.silence = { 0x00, 0x00, 0x08 },
168	},
169	[SNDRV_PCM_FORMAT_U20_3BE] = {
170	.width = 20, .phys = 24, .le = 0, .signd = 0,
171	.silence = { 0x08, 0x00, 0x00 },
172	},
173	[SNDRV_PCM_FORMAT_S18_3LE] = {
174	.width = 18, .phys = 24, .le = 1, .signd = 1,
175	.silence = {},
176	},
177	[SNDRV_PCM_FORMAT_S18_3BE] = {
178	.width = 18, .phys = 24, .le = 0, .signd = 1,
179	.silence = {},
180	},
181	[SNDRV_PCM_FORMAT_U18_3LE] = {
182	.width = 18, .phys = 24, .le = 1, .signd = 0,
183	.silence = { 0x00, 0x00, 0x02 },
184	},
185	[SNDRV_PCM_FORMAT_U18_3BE] = {
186	.width = 18, .phys = 24, .le = 0, .signd = 0,
187	.silence = { 0x02, 0x00, 0x00 },
188	},
189	};
190
191
192	/**
193	* snd_pcm_format_signed - Check the PCM format is signed linear
194	* @format: the format to check
195	*
196	* Returns 1 if the given PCM format is signed linear, 0 if unsigned
197	* linear, and a negative error code for non-linear formats.
198	*/
199	int snd_pcm_format_signed(snd_pcm_format_t format)
200	{
201	int val;
202	if (format < 0 \|\| format > SNDRV_PCM_FORMAT_LAST)
203	return -EINVAL;
204	if ((val = pcm_formats[format].signd) < 0)
205	return -EINVAL;
206	return val;
207	}
208
e88e8ae6 TI	209	EXPORT_SYMBOL(snd_pcm_format_signed);
e88e8ae6 TI	210
1da177e4 LT	211	/**
	212	* snd_pcm_format_unsigned - Check the PCM format is unsigned linear
	213	* @format: the format to check
	214	*
	215	* Returns 1 if the given PCM format is unsigned linear, 0 if signed
	216	* linear, and a negative error code for non-linear formats.
	217	*/
	218	int snd_pcm_format_unsigned(snd_pcm_format_t format)
	219	{
	220	int val;
	221
	222	val = snd_pcm_format_signed(format);
	223	if (val < 0)
	224	return val;
	225	return !val;
	226	}
	227
e88e8ae6 TI	228	EXPORT_SYMBOL(snd_pcm_format_unsigned);
e88e8ae6 TI	229
1da177e4 LT	230	/**
	231	* snd_pcm_format_linear - Check the PCM format is linear
	232	* @format: the format to check
	233	*
	234	* Returns 1 if the given PCM format is linear, 0 if not.
	235	*/
	236	int snd_pcm_format_linear(snd_pcm_format_t format)
	237	{
	238	return snd_pcm_format_signed(format) >= 0;
	239	}
	240
e88e8ae6 TI	241	EXPORT_SYMBOL(snd_pcm_format_linear);
e88e8ae6 TI	242
1da177e4 LT	243	/**
	244	* snd_pcm_format_little_endian - Check the PCM format is little-endian
	245	* @format: the format to check
	246	*
	247	* Returns 1 if the given PCM format is little-endian, 0 if
	248	* big-endian, or a negative error code if endian not specified.
	249	*/
	250	int snd_pcm_format_little_endian(snd_pcm_format_t format)
	251	{
	252	int val;
	253	if (format < 0 \|\| format > SNDRV_PCM_FORMAT_LAST)
	254	return -EINVAL;
	255	if ((val = pcm_formats[format].le) < 0)
	256	return -EINVAL;
	257	return val;
	258	}
	259
e88e8ae6 TI	260	EXPORT_SYMBOL(snd_pcm_format_little_endian);
e88e8ae6 TI	261
1da177e4 LT	262	/**
	263	* snd_pcm_format_big_endian - Check the PCM format is big-endian
	264	* @format: the format to check
	265	*
	266	* Returns 1 if the given PCM format is big-endian, 0 if
	267	* little-endian, or a negative error code if endian not specified.
	268	*/
	269	int snd_pcm_format_big_endian(snd_pcm_format_t format)
	270	{
	271	int val;
	272
	273	val = snd_pcm_format_little_endian(format);
	274	if (val < 0)
	275	return val;
	276	return !val;
	277	}
	278
e88e8ae6 TI	279	EXPORT_SYMBOL(snd_pcm_format_big_endian);
e88e8ae6 TI	280
1da177e4 LT	281	/**
	282	* snd_pcm_format_width - return the bit-width of the format
	283	* @format: the format to check
	284	*
	285	* Returns the bit-width of the format, or a negative error code
	286	* if unknown format.
	287	*/
	288	int snd_pcm_format_width(snd_pcm_format_t format)
	289	{
	290	int val;
	291	if (format < 0 \|\| format > SNDRV_PCM_FORMAT_LAST)
	292	return -EINVAL;
	293	if ((val = pcm_formats[format].width) == 0)
	294	return -EINVAL;
	295	return val;
	296	}
	297
e88e8ae6 TI	298	EXPORT_SYMBOL(snd_pcm_format_width);
e88e8ae6 TI	299
1da177e4 LT	300	/**
	301	* snd_pcm_format_physical_width - return the physical bit-width of the format
	302	* @format: the format to check
	303	*
	304	* Returns the physical bit-width of the format, or a negative error code
	305	* if unknown format.
	306	*/
	307	int snd_pcm_format_physical_width(snd_pcm_format_t format)
	308	{
	309	int val;
	310	if (format < 0 \|\| format > SNDRV_PCM_FORMAT_LAST)
	311	return -EINVAL;
	312	if ((val = pcm_formats[format].phys) == 0)
	313	return -EINVAL;
	314	return val;
	315	}
	316
e88e8ae6 TI	317	EXPORT_SYMBOL(snd_pcm_format_physical_width);
e88e8ae6 TI	318
1da177e4 LT	319	/**
	320	* snd_pcm_format_size - return the byte size of samples on the given format
	321	* @format: the format to check
a66547f3	322	* @samples: sampling rate
1da177e4 LT	323	*
	324	* Returns the byte size of the given samples for the format, or a
	325	* negative error code if unknown format.
	326	*/
	327	ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)
	328	{
	329	int phys_width = snd_pcm_format_physical_width(format);
	330	if (phys_width < 0)
	331	return -EINVAL;
	332	return samples * phys_width / 8;
	333	}
	334
e88e8ae6 TI	335	EXPORT_SYMBOL(snd_pcm_format_size);
e88e8ae6 TI	336
1da177e4 LT	337	/**
	338	* snd_pcm_format_silence_64 - return the silent data in 8 bytes array
	339	* @format: the format to check
	340	*
	341	* Returns the format pattern to fill or NULL if error.
	342	*/
	343	const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format)
	344	{
	345	if (format < 0 \|\| format > SNDRV_PCM_FORMAT_LAST)
	346	return NULL;
	347	if (! pcm_formats[format].phys)
	348	return NULL;
	349	return pcm_formats[format].silence;
	350	}
	351
e88e8ae6 TI	352	EXPORT_SYMBOL(snd_pcm_format_silence_64);
e88e8ae6 TI	353
1da177e4 LT	354	/**
	355	* snd_pcm_format_set_silence - set the silence data on the buffer
	356	* @format: the PCM format
	357	* @data: the buffer pointer
	358	* @samples: the number of samples to set silence
	359	*
	360	* Sets the silence data on the buffer for the given samples.
	361	*
	362	* Returns zero if successful, or a negative error code on failure.
	363	*/
	364	int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
	365	{
	366	int width;
	367	unsigned char dst, pat;
	368
	369	if (format < 0 \|\| format > SNDRV_PCM_FORMAT_LAST)
	370	return -EINVAL;
	371	if (samples == 0)
	372	return 0;
	373	width = pcm_formats[format].phys; /* physical width */
	374	pat = pcm_formats[format].silence;
	375	if (! width)
	376	return -EINVAL;
	377	/* signed or 1 byte data */
	378	if (pcm_formats[format].signd == 1 \|\| width <= 8) {
	379	unsigned int bytes = samples * width / 8;
	380	memset(data, *pat, bytes);
	381	return 0;
	382	}
	383	/* non-zero samples, fill using a loop */
	384	width /= 8;
	385	dst = data;
	386	#if 0
	387	while (samples--) {
	388	memcpy(dst, pat, width);
	389	dst += width;
	390	}
	391	#else
	392	/* a bit optimization for constant width */
	393	switch (width) {
	394	case 2:
	395	while (samples--) {
	396	memcpy(dst, pat, 2);
	397	dst += 2;
	398	}
	399	break;
	400	case 3:
	401	while (samples--) {
	402	memcpy(dst, pat, 3);
	403	dst += 3;
	404	}
	405	break;
	406	case 4:
	407	while (samples--) {
	408	memcpy(dst, pat, 4);
	409	dst += 4;
	410	}
	411	break;
	412	case 8:
	413	while (samples--) {
	414	memcpy(dst, pat, 8);
	415	dst += 8;
	416	}
	417	break;
418	}
419	#endif
420	return 0;
421	}
422
e88e8ae6 TI	423	EXPORT_SYMBOL(snd_pcm_format_set_silence);
e88e8ae6 TI	424
1da177e4 LT	425	/**
	426	* snd_pcm_limit_hw_rates - determine rate_min/rate_max fields
	427	* @runtime: the runtime instance
	428	*
	429	* Determines the rate_min and rate_max fields from the rates bits of
	430	* the given runtime->hw.
	431	*
	432	* Returns zero if successful.
	433	*/
877211f5	434	int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
1da177e4	435	{
1da177e4	436	int i;
7653d557	437	for (i = 0; i < (int)snd_pcm_known_rates.count; i++) {
1da177e4	438	if (runtime->hw.rates & (1 << i)) {
7653d557	439	runtime->hw.rate_min = snd_pcm_known_rates.list[i];
1da177e4 LT	440	break;
	441	}
	442	}
7653d557	443	for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {
1da177e4	444	if (runtime->hw.rates & (1 << i)) {
7653d557	445	runtime->hw.rate_max = snd_pcm_known_rates.list[i];
1da177e4 LT	446	break;
	447	}
	448	}
	449	return 0;
	450	}
e88e8ae6 TI	451
e88e8ae6 TI	452	EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
918f3a0e CL	453
	454	/**
	455	* snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
	456	* @rate: the sample rate to convert
	457	*
	458	* Returns the SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or
	459	* SNDRV_PCM_RATE_KNOT for an unknown rate.
	460	*/
	461	unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate)
	462	{
	463	unsigned int i;
	464
	465	for (i = 0; i < snd_pcm_known_rates.count; i++)
	466	if (snd_pcm_known_rates.list[i] == rate)
	467	return 1u << i;
	468	return SNDRV_PCM_RATE_KNOT;
	469	}
	470	EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit);