490 lines
13 KiB
C
490 lines
13 KiB
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);
|
|
|
|
/* [width][unsigned][bigendian] */
|
|
static int linear_formats[4][2][2] = {
|
|
{{ SNDRV_PCM_FORMAT_S8, SNDRV_PCM_FORMAT_S8},
|
|
{ SNDRV_PCM_FORMAT_U8, SNDRV_PCM_FORMAT_U8}},
|
|
{{SNDRV_PCM_FORMAT_S16_LE, SNDRV_PCM_FORMAT_S16_BE},
|
|
{SNDRV_PCM_FORMAT_U16_LE, SNDRV_PCM_FORMAT_U16_BE}},
|
|
{{SNDRV_PCM_FORMAT_S24_LE, SNDRV_PCM_FORMAT_S24_BE},
|
|
{SNDRV_PCM_FORMAT_U24_LE, SNDRV_PCM_FORMAT_U24_BE}},
|
|
{{SNDRV_PCM_FORMAT_S32_LE, SNDRV_PCM_FORMAT_S32_BE},
|
|
{SNDRV_PCM_FORMAT_U32_LE, SNDRV_PCM_FORMAT_U32_BE}}
|
|
};
|
|
|
|
/**
|
|
* snd_pcm_build_linear_format - return the suitable linear format for the given condition
|
|
* @width: the bit-width
|
|
* @unsignd: 1 if unsigned, 0 if signed.
|
|
* @big_endian: 1 if big-endian, 0 if little-endian
|
|
*
|
|
* Returns the suitable linear format for the given condition.
|
|
*/
|
|
snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian)
|
|
{
|
|
if (width & 7)
|
|
return SND_PCM_FORMAT_UNKNOWN;
|
|
width = (width / 8) - 1;
|
|
if (width < 0 || width >= 4)
|
|
return SND_PCM_FORMAT_UNKNOWN;
|
|
return linear_formats[width][!!unsignd][!!big_endian];
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_build_linear_format);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
static unsigned rates[] = {
|
|
/* ATTENTION: these values depend on the definition in pcm.h! */
|
|
5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
|
|
64000, 88200, 96000, 176400, 192000
|
|
};
|
|
int i;
|
|
for (i = 0; i < (int)ARRAY_SIZE(rates); i++) {
|
|
if (runtime->hw.rates & (1 << i)) {
|
|
runtime->hw.rate_min = rates[i];
|
|
break;
|
|
}
|
|
}
|
|
for (i = (int)ARRAY_SIZE(rates) - 1; i >= 0; i--) {
|
|
if (runtime->hw.rates & (1 << i)) {
|
|
runtime->hw.rate_max = rates[i];
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
|