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Release 4.14 sound/core/pcm_misc.c

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

#include "pcm_local.h"


#define SND_PCM_FORMAT_UNKNOWN (-1)

/* NOTE: "signed" prefix must be given below since the default char is
 *       unsigned on some architectures!
 */

struct pcm_format_data {
	
unsigned char width;	/* bit width */
	
unsigned char phys;	/* physical bit width */
	
signed char le;	/* 0 = big-endian, 1 = little-endian, -1 = others */
	
signed char signd;	/* 0 = unsigned, 1 = signed, -1 = others */
	
unsigned char silence[8];	/* silence data to fill */
};

/* we do lots of calculations on snd_pcm_format_t; shut up sparse */

#define INT	__force int


static struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = {
	[SNDRV_PCM_FORMAT_S8] = {
		.width = 8, .phys = 8, .le = -1, .signd = 1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_U8] = {
		.width = 8, .phys = 8, .le = -1, .signd = 0,
		.silence = { 0x80 },
        },
	[SNDRV_PCM_FORMAT_S16_LE] = {
		.width = 16, .phys = 16, .le = 1, .signd = 1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_S16_BE] = {
		.width = 16, .phys = 16, .le = 0, .signd = 1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_U16_LE] = {
		.width = 16, .phys = 16, .le = 1, .signd = 0,
		.silence = { 0x00, 0x80 },
        },
	[SNDRV_PCM_FORMAT_U16_BE] = {
		.width = 16, .phys = 16, .le = 0, .signd = 0,
		.silence = { 0x80, 0x00 },
        },
	[SNDRV_PCM_FORMAT_S24_LE] = {
		.width = 24, .phys = 32, .le = 1, .signd = 1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_S24_BE] = {
		.width = 24, .phys = 32, .le = 0, .signd = 1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_U24_LE] = {
		.width = 24, .phys = 32, .le = 1, .signd = 0,
		.silence = { 0x00, 0x00, 0x80 },
        },
	[SNDRV_PCM_FORMAT_U24_BE] = {
		.width = 24, .phys = 32, .le = 0, .signd = 0,
		.silence = { 0x00, 0x80, 0x00, 0x00 },
        },
	[SNDRV_PCM_FORMAT_S32_LE] = {
		.width = 32, .phys = 32, .le = 1, .signd = 1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_S32_BE] = {
		.width = 32, .phys = 32, .le = 0, .signd = 1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_U32_LE] = {
		.width = 32, .phys = 32, .le = 1, .signd = 0,
		.silence = { 0x00, 0x00, 0x00, 0x80 },
        },
	[SNDRV_PCM_FORMAT_U32_BE] = {
		.width = 32, .phys = 32, .le = 0, .signd = 0,
		.silence = { 0x80, 0x00, 0x00, 0x00 },
        },
	[SNDRV_PCM_FORMAT_FLOAT_LE] = {
		.width = 32, .phys = 32, .le = 1, .signd = -1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_FLOAT_BE] = {
		.width = 32, .phys = 32, .le = 0, .signd = -1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_FLOAT64_LE] = {
		.width = 64, .phys = 64, .le = 1, .signd = -1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_FLOAT64_BE] = {
		.width = 64, .phys = 64, .le = 0, .signd = -1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE] = {
		.width = 32, .phys = 32, .le = 1, .signd = -1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE] = {
		.width = 32, .phys = 32, .le = 0, .signd = -1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_MU_LAW] = {
		.width = 8, .phys = 8, .le = -1, .signd = -1,
		.silence = { 0x7f },
        },
	[SNDRV_PCM_FORMAT_A_LAW] = {
		.width = 8, .phys = 8, .le = -1, .signd = -1,
		.silence = { 0x55 },
        },
	[SNDRV_PCM_FORMAT_IMA_ADPCM] = {
		.width = 4, .phys = 4, .le = -1, .signd = -1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_G723_24] = {
		.width = 3, .phys = 3, .le = -1, .signd = -1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_G723_40] = {
		.width = 5, .phys = 5, .le = -1, .signd = -1,
		.silence = {},
        },
	[SNDRV_PCM_FORMAT_DSD_U8] = {
		.width = 8, .phys = 8, .le = 1, .signd = 0,
		.silence = { 0x69 },
        },
	[SNDRV_PCM_FORMAT_DSD_U16_LE] = {
		.width = 16, .phys = 16, .le = 1, .signd = 0,
		.silence = { 0x69, 0x69 },
        },
	[SNDRV_PCM_FORMAT_DSD_U32_LE] = {
		.width = 32, .phys = 32, .le = 1, .signd = 0,
		.silence = { 0x69, 0x69, 0x69, 0x69 },
        },
	[SNDRV_PCM_FORMAT_DSD_U16_BE] = {
		.width = 16, .phys = 16, .le = 0, .signd = 0,
		.silence = { 0x69, 0x69 },
        },
	[SNDRV_PCM_FORMAT_DSD_U32_BE] = {
		.width = 32, .phys = 32, .le = 0, .signd = 0,
		.silence = { 0x69, 0x69, 0x69, 0x69 },
        },
	/* FIXME: the following 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
 *
 * Return: 1 if the given PCM format is signed linear, 0 if unsigned
 * linear, and a negative error code for non-linear formats.
 */

int snd_pcm_format_signed(snd_pcm_format_t format) { int val; if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST) return -EINVAL; if ((val = pcm_formats[(INT)format].signd) < 0) return -EINVAL; return val; }

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Jaroslav Kysela4779.66%266.67%
Clemens Ladisch1220.34%133.33%
Total59100.00%3100.00%

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

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Jaroslav Kysela31100.00%4100.00%
Total31100.00%4100.00%

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

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Jaroslav Kysela16100.00%2100.00%
Total16100.00%2100.00%

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

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Jaroslav Kysela4779.66%266.67%
Clemens Ladisch1220.34%133.33%
Total59100.00%3100.00%

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

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Jaroslav Kysela31100.00%2100.00%
Total31100.00%2100.00%

EXPORT_SYMBOL(snd_pcm_format_big_endian); /** * snd_pcm_format_width - return the bit-width of the format * @format: the format to check * * Return: The bit-width of the format, or a negative error code * if unknown format. */
int snd_pcm_format_width(snd_pcm_format_t format) { int val; if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST) return -EINVAL; if ((val = pcm_formats[(INT)format].width) == 0) return -EINVAL; return val; }

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Jaroslav Kysela4779.66%266.67%
Clemens Ladisch1220.34%133.33%
Total59100.00%3100.00%

EXPORT_SYMBOL(snd_pcm_format_width); /** * snd_pcm_format_physical_width - return the physical bit-width of the format * @format: the format to check * * Return: The physical bit-width of the format, or a negative error code * if unknown format. */
int snd_pcm_format_physical_width(snd_pcm_format_t format) { int val; if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST) return -EINVAL; if ((val = pcm_formats[(INT)format].phys) == 0) return -EINVAL; return val; }

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Jaroslav Kysela4779.66%266.67%
Clemens Ladisch1220.34%133.33%
Total59100.00%3100.00%

EXPORT_SYMBOL(snd_pcm_format_physical_width); /** * snd_pcm_format_size - return the byte size of samples on the given format * @format: the format to check * @samples: sampling rate * * Return: The byte size of the given samples for the format, or a * negative error code if unknown format. */
ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples) { int phys_width = snd_pcm_format_physical_width(format); if (phys_width < 0) return -EINVAL; return samples * phys_width / 8; }

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Jaroslav Kysela36100.00%2100.00%
Total36100.00%2100.00%

EXPORT_SYMBOL(snd_pcm_format_size); /** * snd_pcm_format_silence_64 - return the silent data in 8 bytes array * @format: the format to check * * Return: The format pattern to fill or %NULL if error. */
const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format) { if ((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; }

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Jaroslav Kysela4575.00%266.67%
Clemens Ladisch1525.00%133.33%
Total60100.00%3100.00%

EXPORT_SYMBOL(snd_pcm_format_silence_64); /** * snd_pcm_format_set_silence - set the silence data on the buffer * @format: the PCM format * @data: the buffer pointer * @samples: the number of samples to set silence * * Sets the silence data on the buffer for the given samples. * * Return: Zero if successful, or a negative error code on failure. */
int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples) { int width; unsigned char *dst, *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; }

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Jaroslav Kysela24192.69%466.67%
Clemens Ladisch186.92%116.67%
Andrew Morton10.38%116.67%
Total260100.00%6100.00%

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. * * Return: 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; }

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PersonTokensPropCommitsCommitProp
Jaroslav Kysela10488.14%133.33%
Clemens Ladisch1210.17%133.33%
Takashi Iwai21.69%133.33%
Total118100.00%3100.00%

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 * * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or * SNDRV_PCM_RATE_KNOT for an unknown rate. */
unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate) { unsigned int i; for (i = 0; i < snd_pcm_known_rates.count; i++) if (snd_pcm_known_rates.list[i] == rate) return 1u << i; return SNDRV_PCM_RATE_KNOT; }

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Clemens Ladisch48100.00%1100.00%
Total48100.00%1100.00%

EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit); /** * snd_pcm_rate_bit_to_rate - converts SNDRV_PCM_RATE_xxx bit to sample rate * @rate_bit: the rate bit to convert * * Return: The sample rate that corresponds to the given SNDRV_PCM_RATE_xxx flag * or 0 for an unknown rate bit. */
unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit) { unsigned int i; for (i = 0; i < snd_pcm_known_rates.count; i++) if ((1u << i) == rate_bit) return snd_pcm_known_rates.list[i]; return 0; }

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Dimitris Papastamos50100.00%1100.00%
Total50100.00%1100.00%

EXPORT_SYMBOL(snd_pcm_rate_bit_to_rate);
static unsigned int snd_pcm_rate_mask_sanitize(unsigned int rates) { if (rates & SNDRV_PCM_RATE_CONTINUOUS) return SNDRV_PCM_RATE_CONTINUOUS; else if (rates & SNDRV_PCM_RATE_KNOT) return SNDRV_PCM_RATE_KNOT; return rates; }

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Lars-Peter Clausen33100.00%1100.00%
Total33100.00%1100.00%

/** * snd_pcm_rate_mask_intersect - computes the intersection between two rate masks * @rates_a: The first rate mask * @rates_b: The second rate mask * * This function computes the rates that are supported by both rate masks passed * to the function. It will take care of the special handling of * SNDRV_PCM_RATE_CONTINUOUS and SNDRV_PCM_RATE_KNOT. * * Return: A rate mask containing the rates that are supported by both rates_a * and rates_b. */
unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, unsigned int rates_b) { rates_a = snd_pcm_rate_mask_sanitize(rates_a); rates_b = snd_pcm_rate_mask_sanitize(rates_b); if (rates_a & SNDRV_PCM_RATE_CONTINUOUS) return rates_b; else if (rates_b & SNDRV_PCM_RATE_CONTINUOUS) return rates_a; else if (rates_a & SNDRV_PCM_RATE_KNOT) return rates_b; else if (rates_b & SNDRV_PCM_RATE_KNOT) return rates_a; return rates_a & rates_b; }

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Lars-Peter Clausen72100.00%1100.00%
Total72100.00%1100.00%

EXPORT_SYMBOL_GPL(snd_pcm_rate_mask_intersect); /** * snd_pcm_rate_range_to_bits - converts rate range to SNDRV_PCM_RATE_xxx bit * @rate_min: the minimum sample rate * @rate_max: the maximum sample rate * * This function has an implicit assumption: the rates in the given range have * only the pre-defined rates like 44100 or 16000. * * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate range, * or SNDRV_PCM_RATE_KNOT for an unknown range. */
unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min, unsigned int rate_max) { unsigned int rates = 0; int i; for (i = 0; i < snd_pcm_known_rates.count; i++) { if (snd_pcm_known_rates.list[i] >= rate_min && snd_pcm_known_rates.list[i] <= rate_max) rates |= 1 << i; } if (!rates) rates = SNDRV_PCM_RATE_KNOT; return rates; }

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Mengdong Lin78100.00%1100.00%
Total78100.00%1100.00%

EXPORT_SYMBOL_GPL(snd_pcm_rate_range_to_bits);

Overall Contributors

PersonTokensPropCommitsCommitProp
Jaroslav Kysela198171.26%933.33%
Clemens Ladisch1545.54%311.11%
Benjamin Collins1324.75%13.70%
Lars-Peter Clausen1113.99%13.70%
Mengdong Lin843.02%13.70%
Jussi Laako742.66%13.70%
Takashi Iwai702.52%414.81%
Daniel Mack602.16%13.70%
Dimitris Papastamos551.98%13.70%
Jurgen Kramer391.40%13.70%
Yacine Belkadi130.47%13.70%
Takashi Sakamoto30.11%13.70%
Paul Gortmaker30.11%13.70%
Andrew Morton10.04%13.70%
Total2780100.00%27100.00%
Directory: sound/core
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