--- /dev/null
+/*
+ * 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>
+#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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+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;
+}
+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;
+}
+
+/**
+ * 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;
+}
+EXPORT_SYMBOL_GPL(snd_pcm_rate_mask_intersect);
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