/*
* PCM Interface - misc routines
- * Copyright (c) 1998 by Jaroslav Kysela <perex@suse.cz>
+ * 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
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 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.
+ * GNU Lesser General Public License for more details.
*
- * You should have received a copy of the GNU Library General Public
+ * You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
-#ifdef __KERNEL__
-#include "../include/driver.h"
-#include "../include/pcm.h"
-#include "../include/pcm_plugin.h"
-#define bswap_16 swab16
-#define bswap_32 swab32
-#define bswap_64 swab64
-#define SND_PCM_FORMAT_UNKNOWN (-1)
-#define snd_enum_to_int(v) (v)
-#define snd_int_to_enum(v) (v)
-#else
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
-#include <errno.h>
-#include <byteswap.h>
+#include "bswap.h"
#include "pcm_local.h"
-#endif
+
+/**
+ * \brief Return sign info for a PCM sample linear format
+ * \param format Format
+ * \return 0 unsigned, 1 signed, a negative error code if format is not linear
+ */
int snd_pcm_format_signed(snd_pcm_format_t format)
{
- switch (snd_enum_to_int(format)) {
+ switch (format) {
case SNDRV_PCM_FORMAT_S8:
case SNDRV_PCM_FORMAT_S16_LE:
case SNDRV_PCM_FORMAT_S16_BE:
case SNDRV_PCM_FORMAT_S24_BE:
case SNDRV_PCM_FORMAT_S32_LE:
case SNDRV_PCM_FORMAT_S32_BE:
+ case SNDRV_PCM_FORMAT_S24_3LE:
+ case SNDRV_PCM_FORMAT_S24_3BE:
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ case SNDRV_PCM_FORMAT_S20_3BE:
+ case SNDRV_PCM_FORMAT_S18_3LE:
+ case SNDRV_PCM_FORMAT_S18_3BE:
return 1;
case SNDRV_PCM_FORMAT_U8:
case SNDRV_PCM_FORMAT_U16_LE:
case SNDRV_PCM_FORMAT_U24_BE:
case SNDRV_PCM_FORMAT_U32_LE:
case SNDRV_PCM_FORMAT_U32_BE:
+ case SNDRV_PCM_FORMAT_U24_3LE:
+ case SNDRV_PCM_FORMAT_U24_3BE:
+ case SNDRV_PCM_FORMAT_U20_3LE:
+ case SNDRV_PCM_FORMAT_U20_3BE:
+ case SNDRV_PCM_FORMAT_U18_3LE:
+ case SNDRV_PCM_FORMAT_U18_3BE:
+ case SNDRV_PCM_FORMAT_DSD_U8:
+ case SNDRV_PCM_FORMAT_DSD_U16_LE:
+ case SNDRV_PCM_FORMAT_DSD_U32_LE:
+ case SNDRV_PCM_FORMAT_DSD_U16_BE:
+ case SNDRV_PCM_FORMAT_DSD_U32_BE:
return 0;
default:
return -EINVAL;
}
}
+/**
+ * \brief Return sign info for a PCM sample linear format
+ * \param format Format
+ * \return 0 signed, 1 unsigned, a negative error code if format is not linear
+ */
int snd_pcm_format_unsigned(snd_pcm_format_t format)
{
int val;
return !val;
}
+/**
+ * \brief Return linear info for a PCM sample format
+ * \param format Format
+ * \return 0 non linear, 1 linear
+ */
int snd_pcm_format_linear(snd_pcm_format_t format)
{
return snd_pcm_format_signed(format) >= 0;
}
+/**
+ * \brief Return float info for a PCM sample format
+ * \param format Format
+ * \return 0 non float, 1 float
+ */
+int snd_pcm_format_float(snd_pcm_format_t format)
+{
+ switch (format) {
+ case SNDRV_PCM_FORMAT_FLOAT_LE:
+ case SNDRV_PCM_FORMAT_FLOAT_BE:
+ case SNDRV_PCM_FORMAT_FLOAT64_LE:
+ case SNDRV_PCM_FORMAT_FLOAT64_BE:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+/**
+ * \brief Return endian info for a PCM sample format
+ * \param format Format
+ * \return 0 big endian, 1 little endian, a negative error code if endian independent
+ */
int snd_pcm_format_little_endian(snd_pcm_format_t format)
{
- switch (snd_enum_to_int(format)) {
+ switch (format) {
case SNDRV_PCM_FORMAT_S16_LE:
case SNDRV_PCM_FORMAT_U16_LE:
case SNDRV_PCM_FORMAT_S24_LE:
case SNDRV_PCM_FORMAT_FLOAT_LE:
case SNDRV_PCM_FORMAT_FLOAT64_LE:
case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
+ case SNDRV_PCM_FORMAT_S24_3LE:
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ case SNDRV_PCM_FORMAT_S18_3LE:
+ case SNDRV_PCM_FORMAT_U24_3LE:
+ case SNDRV_PCM_FORMAT_U20_3LE:
+ case SNDRV_PCM_FORMAT_U18_3LE:
+ case SNDRV_PCM_FORMAT_DSD_U16_LE:
+ case SNDRV_PCM_FORMAT_DSD_U32_LE:
return 1;
case SNDRV_PCM_FORMAT_S16_BE:
case SNDRV_PCM_FORMAT_U16_BE:
case SNDRV_PCM_FORMAT_FLOAT_BE:
case SNDRV_PCM_FORMAT_FLOAT64_BE:
case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE:
+ case SNDRV_PCM_FORMAT_S24_3BE:
+ case SNDRV_PCM_FORMAT_S20_3BE:
+ case SNDRV_PCM_FORMAT_S18_3BE:
+ case SNDRV_PCM_FORMAT_U24_3BE:
+ case SNDRV_PCM_FORMAT_U20_3BE:
+ case SNDRV_PCM_FORMAT_U18_3BE:
+ case SNDRV_PCM_FORMAT_DSD_U16_BE:
+ case SNDRV_PCM_FORMAT_DSD_U32_BE:
return 0;
default:
return -EINVAL;
}
}
+/**
+ * \brief Return endian info for a PCM sample format
+ * \param format Format
+ * \return 0 little endian, 1 big endian, a negative error code if endian independent
+ */
int snd_pcm_format_big_endian(snd_pcm_format_t format)
{
int val;
return !val;
}
+/**
+ * \brief Return endian info for a PCM sample format
+ * \param format Format
+ * \return 0 swapped, 1 CPU endian, a negative error code if endian independent
+ */
int snd_pcm_format_cpu_endian(snd_pcm_format_t format)
{
#ifdef SNDRV_LITTLE_ENDIAN
#endif
}
+/**
+ * \brief Return nominal bits per a PCM sample
+ * \param format Sample format
+ * \return bits per sample, a negative error code if not applicable
+ */
int snd_pcm_format_width(snd_pcm_format_t format)
{
- switch (snd_enum_to_int(format)) {
+ switch (format) {
case SNDRV_PCM_FORMAT_S8:
case SNDRV_PCM_FORMAT_U8:
+ case SNDRV_PCM_FORMAT_DSD_U8:
return 8;
case SNDRV_PCM_FORMAT_S16_LE:
case SNDRV_PCM_FORMAT_S16_BE:
case SNDRV_PCM_FORMAT_U16_LE:
case SNDRV_PCM_FORMAT_U16_BE:
+ case SNDRV_PCM_FORMAT_DSD_U16_LE:
+ case SNDRV_PCM_FORMAT_DSD_U16_BE:
return 16;
+ case SNDRV_PCM_FORMAT_S18_3LE:
+ case SNDRV_PCM_FORMAT_S18_3BE:
+ case SNDRV_PCM_FORMAT_U18_3LE:
+ case SNDRV_PCM_FORMAT_U18_3BE:
+ return 18;
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ case SNDRV_PCM_FORMAT_S20_3BE:
+ case SNDRV_PCM_FORMAT_U20_3LE:
+ case SNDRV_PCM_FORMAT_U20_3BE:
+ return 20;
case SNDRV_PCM_FORMAT_S24_LE:
case SNDRV_PCM_FORMAT_S24_BE:
case SNDRV_PCM_FORMAT_U24_LE:
case SNDRV_PCM_FORMAT_U24_BE:
+ case SNDRV_PCM_FORMAT_S24_3LE:
+ case SNDRV_PCM_FORMAT_S24_3BE:
+ case SNDRV_PCM_FORMAT_U24_3LE:
+ case SNDRV_PCM_FORMAT_U24_3BE:
return 24;
case SNDRV_PCM_FORMAT_S32_LE:
case SNDRV_PCM_FORMAT_S32_BE:
case SNDRV_PCM_FORMAT_U32_BE:
case SNDRV_PCM_FORMAT_FLOAT_LE:
case SNDRV_PCM_FORMAT_FLOAT_BE:
+ case SNDRV_PCM_FORMAT_DSD_U32_LE:
+ case SNDRV_PCM_FORMAT_DSD_U32_BE:
return 32;
case SNDRV_PCM_FORMAT_FLOAT64_LE:
case SNDRV_PCM_FORMAT_FLOAT64_BE:
return 64;
case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE:
- return 24;
+ return 32;
case SNDRV_PCM_FORMAT_MU_LAW:
case SNDRV_PCM_FORMAT_A_LAW:
return 8;
}
}
+/**
+ * \brief Return bits needed to store a PCM sample
+ * \param format Sample format
+ * \return bits per sample, a negative error code if not applicable
+ */
int snd_pcm_format_physical_width(snd_pcm_format_t format)
{
- switch (snd_enum_to_int(format)) {
+ switch (format) {
case SNDRV_PCM_FORMAT_S8:
case SNDRV_PCM_FORMAT_U8:
+ case SNDRV_PCM_FORMAT_DSD_U8:
return 8;
case SNDRV_PCM_FORMAT_S16_LE:
case SNDRV_PCM_FORMAT_S16_BE:
case SNDRV_PCM_FORMAT_U16_LE:
case SNDRV_PCM_FORMAT_U16_BE:
+ case SNDRV_PCM_FORMAT_DSD_U16_LE:
+ case SNDRV_PCM_FORMAT_DSD_U16_BE:
return 16;
+ case SNDRV_PCM_FORMAT_S18_3LE:
+ case SNDRV_PCM_FORMAT_S18_3BE:
+ case SNDRV_PCM_FORMAT_U18_3LE:
+ case SNDRV_PCM_FORMAT_U18_3BE:
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ case SNDRV_PCM_FORMAT_S20_3BE:
+ case SNDRV_PCM_FORMAT_U20_3LE:
+ case SNDRV_PCM_FORMAT_U20_3BE:
+ case SNDRV_PCM_FORMAT_S24_3LE:
+ case SNDRV_PCM_FORMAT_S24_3BE:
+ case SNDRV_PCM_FORMAT_U24_3LE:
+ case SNDRV_PCM_FORMAT_U24_3BE:
+ return 24;
case SNDRV_PCM_FORMAT_S24_LE:
case SNDRV_PCM_FORMAT_S24_BE:
case SNDRV_PCM_FORMAT_U24_LE:
case SNDRV_PCM_FORMAT_FLOAT_BE:
case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE:
+ case SNDRV_PCM_FORMAT_DSD_U32_LE:
+ case SNDRV_PCM_FORMAT_DSD_U32_BE:
return 32;
case SNDRV_PCM_FORMAT_FLOAT64_LE:
case SNDRV_PCM_FORMAT_FLOAT64_BE:
}
}
+/**
+ * \brief Return bytes needed to store a quantity of PCM sample
+ * \param format Sample format
+ * \param samples Samples count
+ * \return bytes needed, a negative error code if not integer or unknown
+ */
ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)
{
- switch (snd_enum_to_int(format)) {
+ switch (format) {
case SNDRV_PCM_FORMAT_S8:
case SNDRV_PCM_FORMAT_U8:
+ case SNDRV_PCM_FORMAT_DSD_U8:
return samples;
case SNDRV_PCM_FORMAT_S16_LE:
case SNDRV_PCM_FORMAT_S16_BE:
case SNDRV_PCM_FORMAT_U16_LE:
case SNDRV_PCM_FORMAT_U16_BE:
+ case SNDRV_PCM_FORMAT_DSD_U16_LE:
+ case SNDRV_PCM_FORMAT_DSD_U16_BE:
return samples * 2;
+ case SNDRV_PCM_FORMAT_S18_3LE:
+ case SNDRV_PCM_FORMAT_S18_3BE:
+ case SNDRV_PCM_FORMAT_U18_3LE:
+ case SNDRV_PCM_FORMAT_U18_3BE:
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ case SNDRV_PCM_FORMAT_S20_3BE:
+ case SNDRV_PCM_FORMAT_U20_3LE:
+ case SNDRV_PCM_FORMAT_U20_3BE:
+ case SNDRV_PCM_FORMAT_S24_3LE:
+ case SNDRV_PCM_FORMAT_S24_3BE:
+ case SNDRV_PCM_FORMAT_U24_3LE:
+ case SNDRV_PCM_FORMAT_U24_3BE:
+ return samples * 3;
case SNDRV_PCM_FORMAT_S24_LE:
case SNDRV_PCM_FORMAT_S24_BE:
case SNDRV_PCM_FORMAT_U24_LE:
case SNDRV_PCM_FORMAT_U32_BE:
case SNDRV_PCM_FORMAT_FLOAT_LE:
case SNDRV_PCM_FORMAT_FLOAT_BE:
+ case SNDRV_PCM_FORMAT_DSD_U32_LE:
+ case SNDRV_PCM_FORMAT_DSD_U32_BE:
return samples * 4;
case SNDRV_PCM_FORMAT_FLOAT64_LE:
case SNDRV_PCM_FORMAT_FLOAT64_BE:
return -EINVAL;
return samples / 2;
default:
+ assert(0);
return -EINVAL;
}
}
+/**
+ * \brief Return 64 bit expressing silence for a PCM sample format
+ * \param format Sample format
+ * \return silence 64 bit word
+ */
u_int64_t snd_pcm_format_silence_64(snd_pcm_format_t format)
{
- switch (snd_enum_to_int(format)) {
+ switch (format) {
case SNDRV_PCM_FORMAT_S8:
case SNDRV_PCM_FORMAT_S16_LE:
case SNDRV_PCM_FORMAT_S16_BE:
case SNDRV_PCM_FORMAT_S24_BE:
case SNDRV_PCM_FORMAT_S32_LE:
case SNDRV_PCM_FORMAT_S32_BE:
+ case SNDRV_PCM_FORMAT_S24_3LE:
+ case SNDRV_PCM_FORMAT_S24_3BE:
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ case SNDRV_PCM_FORMAT_S20_3BE:
+ case SNDRV_PCM_FORMAT_S18_3LE:
+ case SNDRV_PCM_FORMAT_S18_3BE:
return 0;
case SNDRV_PCM_FORMAT_U8:
return 0x8080808080808080ULL;
+ case SNDRV_PCM_FORMAT_DSD_U8:
+ case SNDRV_PCM_FORMAT_DSD_U16_LE:
+ case SNDRV_PCM_FORMAT_DSD_U32_LE:
+ case SNDRV_PCM_FORMAT_DSD_U16_BE:
+ case SNDRV_PCM_FORMAT_DSD_U32_BE:
+ return 0x6969696969696969ULL;
#ifdef SNDRV_LITTLE_ENDIAN
case SNDRV_PCM_FORMAT_U16_LE:
return 0x8000800080008000ULL;
return 0x0000800000008000ULL;
case SNDRV_PCM_FORMAT_U32_BE:
return 0x0000008000000080ULL;
+ case SNDRV_PCM_FORMAT_U24_3LE:
+ return 0x0000800000800000ULL;
+ case SNDRV_PCM_FORMAT_U24_3BE:
+ return 0x0080000080000080ULL;
+ case SNDRV_PCM_FORMAT_U20_3LE:
+ return 0x0000080000080000ULL;
+ case SNDRV_PCM_FORMAT_U20_3BE:
+ return 0x0008000008000008ULL;
+ case SNDRV_PCM_FORMAT_U18_3LE:
+ return 0x0000020000020000ULL;
+ case SNDRV_PCM_FORMAT_U18_3BE:
+ return 0x0002000002000002ULL;
#else
case SNDRV_PCM_FORMAT_U16_LE:
return 0x0080008000800080ULL;
return 0x0080000000800000ULL;
case SNDRV_PCM_FORMAT_U32_BE:
return 0x8000000080000000ULL;
+ case SNDRV_PCM_FORMAT_U24_3LE:
+ return 0x0080000080000080ULL;
+ case SNDRV_PCM_FORMAT_U24_3BE:
+ return 0x0000800000800000ULL;
+ case SNDRV_PCM_FORMAT_U20_3LE:
+ return 0x0008000008000008ULL;
+ case SNDRV_PCM_FORMAT_U20_3BE:
+ return 0x0000080000080000ULL;
+ case SNDRV_PCM_FORMAT_U18_3LE:
+ return 0x0002000002000002ULL;
+ case SNDRV_PCM_FORMAT_U18_3BE:
+ return 0x0000020000020000ULL;
#endif
case SNDRV_PCM_FORMAT_FLOAT_LE:
{
union {
- float f;
- u_int32_t i;
+ float f[2];
+ u_int64_t i;
} u;
- u.f = 0.0;
+ u.f[0] = u.f[1] = 0.0;
#ifdef SNDRV_LITTLE_ENDIAN
return u.i;
#else
- return bswap_32(u.i);
+ return bswap_64(u.i);
#endif
}
case SNDRV_PCM_FORMAT_FLOAT64_LE:
case SNDRV_PCM_FORMAT_FLOAT_BE:
{
union {
- float f;
- u_int32_t i;
+ float f[2];
+ u_int64_t i;
} u;
- u.f = 0.0;
+ u.f[0] = u.f[1] = 0.0;
#ifdef SNDRV_LITTLE_ENDIAN
- return bswap_32(u.i);
+ return bswap_64(u.i);
#else
return u.i;
#endif
case SNDRV_PCM_FORMAT_GSM:
case SNDRV_PCM_FORMAT_SPECIAL:
return 0;
+ default:
+ assert(0);
+ return 0;
}
return 0;
}
+/**
+ * \brief Return 32 bit expressing silence for a PCM sample format
+ * \param format Sample format
+ * \return silence 32 bit word
+ */
u_int32_t snd_pcm_format_silence_32(snd_pcm_format_t format)
{
+ assert(snd_pcm_format_physical_width(format) <= 32);
return (u_int32_t)snd_pcm_format_silence_64(format);
}
+/**
+ * \brief Return 16 bit expressing silence for a PCM sample format
+ * \param format Sample format
+ * \return silence 16 bit word
+ */
u_int16_t snd_pcm_format_silence_16(snd_pcm_format_t format)
{
+ assert(snd_pcm_format_physical_width(format) <= 16);
return (u_int16_t)snd_pcm_format_silence_64(format);
}
+/**
+ * \brief Return 8 bit expressing silence for a PCM sample format
+ * \param format Sample format
+ * \return silence 8 bit word
+ */
u_int8_t snd_pcm_format_silence(snd_pcm_format_t format)
{
+ assert(snd_pcm_format_physical_width(format) <= 8);
return (u_int8_t)snd_pcm_format_silence_64(format);
}
+/**
+ * \brief Silence a PCM samples buffer
+ * \param format Sample format
+ * \param data Buffer
+ * \param samples Samples count
+ * \return 0 if successful or a negative error code
+ */
int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
{
if (samples == 0)
return 0;
- switch (snd_pcm_format_width(format)) {
+ switch (snd_pcm_format_physical_width(format)) {
case 4: {
u_int8_t silence = snd_pcm_format_silence_64(format);
unsigned int samples1;
}
case 16: {
u_int16_t silence = snd_pcm_format_silence_64(format);
- while (samples-- > 0)
- *((u_int16_t *)data)++ = silence;
+ u_int16_t *pdata = (u_int16_t *)data;
+ if (! silence)
+ memset(data, 0, samples * 2);
+ else {
+ while (samples-- > 0)
+ *pdata++ = silence;
+ }
+ break;
+ }
+ case 24: {
+ u_int32_t silence = snd_pcm_format_silence_64(format);
+ u_int8_t *pdata = (u_int8_t *)data;
+ if (! silence)
+ memset(data, 0, samples * 3);
+ else {
+ while (samples-- > 0) {
+#ifdef SNDRV_LITTLE_ENDIAN
+ *pdata++ = silence >> 0;
+ *pdata++ = silence >> 8;
+ *pdata++ = silence >> 16;
+#else
+ *pdata++ = silence >> 16;
+ *pdata++ = silence >> 8;
+ *pdata++ = silence >> 0;
+#endif
+ }
+ }
break;
}
case 32: {
u_int32_t silence = snd_pcm_format_silence_64(format);
- while (samples-- > 0)
- *((u_int32_t *)data)++ = silence;
+ u_int32_t *pdata = (u_int32_t *)data;
+ if (! silence)
+ memset(data, 0, samples * 4);
+ else {
+ while (samples-- > 0)
+ *pdata++ = silence;
+ }
break;
}
case 64: {
u_int64_t silence = snd_pcm_format_silence_64(format);
- while (samples-- > 0)
- *((u_int64_t *)data)++ = silence;
+ u_int64_t *pdata = (u_int64_t *)data;
+ if (! silence)
+ memset(data, 0, samples * 8);
+ else {
+ while (samples-- > 0)
+ *pdata++ = silence;
+ }
break;
}
default:
+ assert(0);
return -EINVAL;
}
return 0;
}
-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
+static const 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 } }
+};
+
+static const int linear24_formats[3][2][2] = {
+ { { SNDRV_PCM_FORMAT_S24_3LE, SNDRV_PCM_FORMAT_S24_3BE },
+ { SNDRV_PCM_FORMAT_U24_3LE, SNDRV_PCM_FORMAT_U24_3BE } },
+ { { SNDRV_PCM_FORMAT_S20_3LE, SNDRV_PCM_FORMAT_S20_3BE },
+ { SNDRV_PCM_FORMAT_U20_3LE, SNDRV_PCM_FORMAT_U20_3BE } },
+ { { SNDRV_PCM_FORMAT_S18_3LE, SNDRV_PCM_FORMAT_S18_3BE },
+ { SNDRV_PCM_FORMAT_U18_3LE, SNDRV_PCM_FORMAT_U18_3BE } },
};
-snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian)
+/**
+ * \brief Compose a PCM sample linear format
+ * \param width Nominal bits per sample
+ * \param pwidth Physical bit width of the format
+ * \param unsignd Sign: 0 signed, 1 unsigned
+ * \param big_endian Endian: 0 little endian, 1 big endian
+ * \return The matching format type, or #SND_PCM_FORMAT_UNKNOWN if no match
+ */
+snd_pcm_format_t snd_pcm_build_linear_format(int width, int pwidth, int unsignd, int big_endian)
{
- switch (width) {
- case 8:
- width = 0;
- break;
- case 16:
- width = 1;
- break;
- case 24:
- width = 2;
- break;
- case 32:
- width = 3;
- break;
- default:
- return SND_PCM_FORMAT_UNKNOWN;
+ if (pwidth == 24) {
+ switch (width) {
+ case 24:
+ width = 0;
+ break;
+ case 20:
+ width = 1;
+ break;
+ case 18:
+ width = 2;
+ break;
+ default:
+ return SND_PCM_FORMAT_UNKNOWN;
+ }
+ return linear24_formats[width][!!unsignd][!!big_endian];
+ } else {
+ switch (width) {
+ case 8:
+ width = 0;
+ break;
+ case 16:
+ width = 1;
+ break;
+ case 24:
+ width = 2;
+ break;
+ case 32:
+ width = 3;
+ break;
+ default:
+ return SND_PCM_FORMAT_UNKNOWN;
+ }
+ return linear_formats[width][!!unsignd][!!big_endian];
}
- return snd_int_to_enum(((int(*)[2][2])linear_formats)[width][!!unsignd][!!big_endian]);
+}
+
+/**
+ * \brief Parse control element id from the config
+ * \param conf the config tree to parse
+ * \param ctl_id the pointer to store the resultant control element id
+ * \param cardp the pointer to store the card index
+ * \param cchannelsp the pointer to store the number of channels (optional)
+ * \param hwctlp the pointer to store the h/w control flag (optional)
+ * \return 0 if successful, or a negative error code
+ *
+ * This function parses the given config tree to retrieve the control element id
+ * and the card index. It's used by softvol. External PCM plugins can use this
+ * function for creating or assigining their controls.
+ *
+ * cchannelsp and hwctlp arguments are optional. Set NULL if not necessary.
+ */
+int snd_pcm_parse_control_id(snd_config_t *conf, snd_ctl_elem_id_t *ctl_id, int *cardp,
+ int *cchannelsp, int *hwctlp)
+{
+ snd_config_iterator_t i, next;
+ int iface = SND_CTL_ELEM_IFACE_MIXER;
+ const char *name = NULL;
+ long index = 0;
+ long device = -1;
+ long subdevice = -1;
+ int err;
+
+ assert(ctl_id && cardp);
+
+ *cardp = -1;
+ if (cchannelsp)
+ *cchannelsp = 2;
+ snd_config_for_each(i, next, conf) {
+ snd_config_t *n = snd_config_iterator_entry(i);
+ const char *id;
+ if (snd_config_get_id(n, &id) < 0)
+ continue;
+ if (strcmp(id, "comment") == 0)
+ continue;
+ if (strcmp(id, "card") == 0) {
+ const char *str;
+ long v;
+ if ((err = snd_config_get_integer(n, &v)) < 0) {
+ if ((err = snd_config_get_string(n, &str)) < 0) {
+ SNDERR("Invalid field %s", id);
+ goto _err;
+ }
+ *cardp = snd_card_get_index(str);
+ if (*cardp < 0) {
+ SNDERR("Cannot get index for %s", str);
+ err = *cardp;
+ goto _err;
+ }
+ } else
+ *cardp = v;
+ continue;
+ }
+ if (strcmp(id, "iface") == 0 || strcmp(id, "interface") == 0) {
+ const char *ptr;
+ if ((err = snd_config_get_string(n, &ptr)) < 0) {
+ SNDERR("field %s is not a string", id);
+ goto _err;
+ }
+ if ((err = snd_config_get_ctl_iface_ascii(ptr)) < 0) {
+ SNDERR("Invalid value for '%s'", id);
+ goto _err;
+ }
+ iface = err;
+ continue;
+ }
+ if (strcmp(id, "name") == 0) {
+ if ((err = snd_config_get_string(n, &name)) < 0) {
+ SNDERR("field %s is not a string", id);
+ goto _err;
+ }
+ continue;
+ }
+ if (strcmp(id, "index") == 0) {
+ if ((err = snd_config_get_integer(n, &index)) < 0) {
+ SNDERR("field %s is not an integer", id);
+ goto _err;
+ }
+ continue;
+ }
+ if (strcmp(id, "device") == 0) {
+ if ((err = snd_config_get_integer(n, &device)) < 0) {
+ SNDERR("field %s is not an integer", id);
+ goto _err;
+ }
+ continue;
+ }
+ if (strcmp(id, "subdevice") == 0) {
+ if ((err = snd_config_get_integer(n, &subdevice)) < 0) {
+ SNDERR("field %s is not an integer", id);
+ goto _err;
+ }
+ continue;
+ }
+ if (cchannelsp && strcmp(id, "count") == 0) {
+ long v;
+ if ((err = snd_config_get_integer(n, &v)) < 0) {
+ SNDERR("field %s is not an integer", id);
+ goto _err;
+ }
+ if (v < 1 || v > 2) {
+ SNDERR("Invalid count %ld", v);
+ goto _err;
+ }
+ *cchannelsp = v;
+ continue;
+ }
+ if (hwctlp && strcmp(id, "hwctl") == 0) {
+ if ((err = snd_config_get_bool(n)) < 0) {
+ SNDERR("The field %s must be a boolean type", id);
+ return err;
+ }
+ *hwctlp = err;
+ continue;
+ }
+ SNDERR("Unknown field %s", id);
+ return -EINVAL;
+ }
+ if (name == NULL) {
+ SNDERR("Missing control name");
+ err = -EINVAL;
+ goto _err;
+ }
+ if (device < 0)
+ device = 0;
+ if (subdevice < 0)
+ subdevice = 0;
+
+ snd_ctl_elem_id_set_interface(ctl_id, iface);
+ snd_ctl_elem_id_set_name(ctl_id, name);
+ snd_ctl_elem_id_set_index(ctl_id, index);
+ snd_ctl_elem_id_set_device(ctl_id, device);
+ snd_ctl_elem_id_set_subdevice(ctl_id, subdevice);
+
+ return 0;
+
+ _err:
+ return err;
}
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