[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / core / pcm_misc.c

/*
 *  PCM Interface - misc routines
 *  Copyright (c) 1998 by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
#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 = { 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
 *
 * 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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* PCM Interface - misc routines
	3	* Copyright (c) 1998 by Jaroslav Kysela <perex@suse.cz>
	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
	22	#include <sound/driver.h>
	23	#include <linux/time.h>
	24	#include <sound/core.h>
	25	#include <sound/pcm.h>
	26	#define SND_PCM_FORMAT_UNKNOWN (-1)
	27
	28	/* NOTE: "signed" prefix must be given below since the default char is
	29	* unsigned on some architectures!
	30	*/
	31	struct pcm_format_data {
	32	unsigned char width; /* bit width */
	33	unsigned char phys; /* physical bit width */
	34	signed char le; /* 0 = big-endian, 1 = little-endian, -1 = others */
	35	signed char signd; /* 0 = unsigned, 1 = signed, -1 = others */
	36	unsigned char silence[8]; /* silence data to fill */
	37	};
	38
	39	static struct pcm_format_data pcm_formats[SNDRV_PCM_FORMAT_LAST+1] = {
	40	[SNDRV_PCM_FORMAT_S8] = {
	41	.width = 8, .phys = 8, .le = -1, .signd = 1,
	42	.silence = {},
	43	},
	44	[SNDRV_PCM_FORMAT_U8] = {
	45	.width = 8, .phys = 8, .le = -1, .signd = 0,
	46	.silence = { 0x80 },
	47	},
	48	[SNDRV_PCM_FORMAT_S16_LE] = {
	49	.width = 16, .phys = 16, .le = 1, .signd = 1,
	50	.silence = {},
	51	},
	52	[SNDRV_PCM_FORMAT_S16_BE] = {
	53	.width = 16, .phys = 16, .le = 0, .signd = 1,
	54	.silence = {},
	55	},
	56	[SNDRV_PCM_FORMAT_U16_LE] = {
	57	.width = 16, .phys = 16, .le = 1, .signd = 0,
	58	.silence = { 0x00, 0x80 },
	59	},
	60	[SNDRV_PCM_FORMAT_U16_BE] = {
	61	.width = 16, .phys = 16, .le = 0, .signd = 0,
	62	.silence = { 0x80, 0x00 },
	63	},
	64	[SNDRV_PCM_FORMAT_S24_LE] = {
65	.width = 24, .phys = 32, .le = 1, .signd = 1,
66	.silence = {},
67	},
68	[SNDRV_PCM_FORMAT_S24_BE] = {
69	.width = 24, .phys = 32, .le = 0, .signd = 1,
70	.silence = {},
71	},
72	[SNDRV_PCM_FORMAT_U24_LE] = {
73	.width = 24, .phys = 32, .le = 1, .signd = 0,
74	.silence = { 0x00, 0x00, 0x80 },
75	},
76	[SNDRV_PCM_FORMAT_U24_BE] = {
77	.width = 24, .phys = 32, .le = 0, .signd = 0,
78	.silence = { 0x80, 0x00, 0x00 },
79	},
80	[SNDRV_PCM_FORMAT_S32_LE] = {
81	.width = 32, .phys = 32, .le = 1, .signd = 1,
82	.silence = {},
83	},
84	[SNDRV_PCM_FORMAT_S32_BE] = {
85	.width = 32, .phys = 32, .le = 0, .signd = 1,
86	.silence = {},
87	},
88	[SNDRV_PCM_FORMAT_U32_LE] = {
89	.width = 32, .phys = 32, .le = 1, .signd = 0,
90	.silence = { 0x00, 0x00, 0x00, 0x80 },
91	},
92	[SNDRV_PCM_FORMAT_U32_BE] = {
93	.width = 32, .phys = 32, .le = 0, .signd = 0,
94	.silence = { 0x80, 0x00, 0x00, 0x00 },
95	},
96	[SNDRV_PCM_FORMAT_FLOAT_LE] = {
97	.width = 32, .phys = 32, .le = 1, .signd = -1,
98	.silence = {},
99	},
100	[SNDRV_PCM_FORMAT_FLOAT_BE] = {
101	.width = 32, .phys = 32, .le = 0, .signd = -1,
102	.silence = {},
103	},
104	[SNDRV_PCM_FORMAT_FLOAT64_LE] = {
105	.width = 64, .phys = 64, .le = 1, .signd = -1,
106	.silence = {},
107	},
108	[SNDRV_PCM_FORMAT_FLOAT64_BE] = {
109	.width = 64, .phys = 64, .le = 0, .signd = -1,
110	.silence = {},
111	},
112	[SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE] = {
113	.width = 32, .phys = 32, .le = 1, .signd = -1,
114	.silence = {},
115	},
116	[SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE] = {
117	.width = 32, .phys = 32, .le = 0, .signd = -1,
118	.silence = {},
119	},
120	[SNDRV_PCM_FORMAT_MU_LAW] = {
121	.width = 8, .phys = 8, .le = -1, .signd = -1,
122	.silence = { 0x7f },
123	},
124	[SNDRV_PCM_FORMAT_A_LAW] = {
125	.width = 8, .phys = 8, .le = -1, .signd = -1,
126	.silence = { 0x55 },
127	},
128	[SNDRV_PCM_FORMAT_IMA_ADPCM] = {
129	.width = 4, .phys = 4, .le = -1, .signd = -1,
130	.silence = {},
131	},
132	/* FIXME: the following three formats are not defined properly yet */
133	[SNDRV_PCM_FORMAT_MPEG] = {
134	.le = -1, .signd = -1,
135	},
136	[SNDRV_PCM_FORMAT_GSM] = {
137	.le = -1, .signd = -1,
138	},
139	[SNDRV_PCM_FORMAT_SPECIAL] = {
140	.le = -1, .signd = -1,
141	},
142	[SNDRV_PCM_FORMAT_S24_3LE] = {
143	.width = 24, .phys = 24, .le = 1, .signd = 1,
144	.silence = {},
145	},
146	[SNDRV_PCM_FORMAT_S24_3BE] = {
147	.width = 24, .phys = 24, .le = 0, .signd = 1,
148	.silence = {},
149	},
150	[SNDRV_PCM_FORMAT_U24_3LE] = {
151	.width = 24, .phys = 24, .le = 1, .signd = 0,
152	.silence = { 0x00, 0x00, 0x80 },
153	},
154	[SNDRV_PCM_FORMAT_U24_3BE] = {
155	.width = 24, .phys = 24, .le = 0, .signd = 0,
156	.silence = { 0x80, 0x00, 0x00 },
157	},
158	[SNDRV_PCM_FORMAT_S20_3LE] = {
159	.width = 20, .phys = 24, .le = 1, .signd = 1,
160	.silence = {},
161	},
162	[SNDRV_PCM_FORMAT_S20_3BE] = {
163	.width = 20, .phys = 24, .le = 0, .signd = 1,
164	.silence = {},
165	},
166	[SNDRV_PCM_FORMAT_U20_3LE] = {
167	.width = 20, .phys = 24, .le = 1, .signd = 0,
168	.silence = { 0x00, 0x00, 0x08 },
169	},
170	[SNDRV_PCM_FORMAT_U20_3BE] = {
171	.width = 20, .phys = 24, .le = 0, .signd = 0,
172	.silence = { 0x08, 0x00, 0x00 },
173	},
174	[SNDRV_PCM_FORMAT_S18_3LE] = {
175	.width = 18, .phys = 24, .le = 1, .signd = 1,
176	.silence = {},
177	},
178	[SNDRV_PCM_FORMAT_S18_3BE] = {
179	.width = 18, .phys = 24, .le = 0, .signd = 1,
180	.silence = {},
181	},
182	[SNDRV_PCM_FORMAT_U18_3LE] = {
183	.width = 18, .phys = 24, .le = 1, .signd = 0,
184	.silence = { 0x00, 0x00, 0x02 },
185	},
186	[SNDRV_PCM_FORMAT_U18_3BE] = {
187	.width = 18, .phys = 24, .le = 0, .signd = 0,
188	.silence = { 0x02, 0x00, 0x00 },
189	},
190	};
191
192
193	/**
194	* snd_pcm_format_signed - Check the PCM format is signed linear
195	* @format: the format to check
196	*
197	* Returns 1 if the given PCM format is signed linear, 0 if unsigned
198	* linear, and a negative error code for non-linear formats.
199	*/
200	int snd_pcm_format_signed(snd_pcm_format_t format)
201	{
202	int val;
203	if (format < 0 \|\| format > SNDRV_PCM_FORMAT_LAST)
204	return -EINVAL;
205	if ((val = pcm_formats[format].signd) < 0)
206	return -EINVAL;
207	return val;
208	}
209
e88e8ae6 TI	210	EXPORT_SYMBOL(snd_pcm_format_signed);
e88e8ae6 TI	211
1da177e4 LT	212	/**
	213	* snd_pcm_format_unsigned - Check the PCM format is unsigned linear
	214	* @format: the format to check
	215	*
	216	* Returns 1 if the given PCM format is unsigned linear, 0 if signed
	217	* linear, and a negative error code for non-linear formats.
	218	*/
	219	int snd_pcm_format_unsigned(snd_pcm_format_t format)
	220	{
	221	int val;
	222
	223	val = snd_pcm_format_signed(format);
	224	if (val < 0)
	225	return val;
	226	return !val;
	227	}
	228
e88e8ae6 TI	229	EXPORT_SYMBOL(snd_pcm_format_unsigned);
e88e8ae6 TI	230
1da177e4 LT	231	/**
	232	* snd_pcm_format_linear - Check the PCM format is linear
	233	* @format: the format to check
	234	*
	235	* Returns 1 if the given PCM format is linear, 0 if not.
	236	*/
	237	int snd_pcm_format_linear(snd_pcm_format_t format)
	238	{
	239	return snd_pcm_format_signed(format) >= 0;
	240	}
	241
e88e8ae6 TI	242	EXPORT_SYMBOL(snd_pcm_format_linear);
e88e8ae6 TI	243
1da177e4 LT	244	/**
	245	* snd_pcm_format_little_endian - Check the PCM format is little-endian
	246	* @format: the format to check
	247	*
	248	* Returns 1 if the given PCM format is little-endian, 0 if
	249	* big-endian, or a negative error code if endian not specified.
	250	*/
	251	int snd_pcm_format_little_endian(snd_pcm_format_t format)
	252	{
	253	int val;
	254	if (format < 0 \|\| format > SNDRV_PCM_FORMAT_LAST)
	255	return -EINVAL;
	256	if ((val = pcm_formats[format].le) < 0)
	257	return -EINVAL;
	258	return val;
	259	}
	260
e88e8ae6 TI	261	EXPORT_SYMBOL(snd_pcm_format_little_endian);
e88e8ae6 TI	262
1da177e4 LT	263	/**
	264	* snd_pcm_format_big_endian - Check the PCM format is big-endian
	265	* @format: the format to check
	266	*
	267	* Returns 1 if the given PCM format is big-endian, 0 if
	268	* little-endian, or a negative error code if endian not specified.
	269	*/
	270	int snd_pcm_format_big_endian(snd_pcm_format_t format)
	271	{
	272	int val;
	273
	274	val = snd_pcm_format_little_endian(format);
	275	if (val < 0)
	276	return val;
	277	return !val;
	278	}
	279
e88e8ae6 TI	280	EXPORT_SYMBOL(snd_pcm_format_big_endian);
e88e8ae6 TI	281
1da177e4 LT	282	/**
	283	* snd_pcm_format_width - return the bit-width of the format
	284	* @format: the format to check
	285	*
	286	* Returns the bit-width of the format, or a negative error code
	287	* if unknown format.
	288	*/
	289	int snd_pcm_format_width(snd_pcm_format_t format)
	290	{
	291	int val;
	292	if (format < 0 \|\| format > SNDRV_PCM_FORMAT_LAST)
	293	return -EINVAL;
	294	if ((val = pcm_formats[format].width) == 0)
	295	return -EINVAL;
	296	return val;
	297	}
	298
e88e8ae6 TI	299	EXPORT_SYMBOL(snd_pcm_format_width);
e88e8ae6 TI	300
1da177e4 LT	301	/**
	302	* snd_pcm_format_physical_width - return the physical bit-width of the format
	303	* @format: the format to check
	304	*
	305	* Returns the physical bit-width of the format, or a negative error code
	306	* if unknown format.
	307	*/
	308	int snd_pcm_format_physical_width(snd_pcm_format_t format)
	309	{
	310	int val;
	311	if (format < 0 \|\| format > SNDRV_PCM_FORMAT_LAST)
	312	return -EINVAL;
	313	if ((val = pcm_formats[format].phys) == 0)
	314	return -EINVAL;
	315	return val;
	316	}
	317
e88e8ae6 TI	318	EXPORT_SYMBOL(snd_pcm_format_physical_width);
e88e8ae6 TI	319
1da177e4 LT	320	/**
	321	* snd_pcm_format_size - return the byte size of samples on the given format
	322	* @format: the format to check
	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);