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Added new PCM functions (pcm_misc.c).

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New plugins: rate, voices.
This commit is contained in:
Jaroslav Kysela 1999-11-24 17:00:16 +00:00
parent a743444ef3
commit 4a01380a7b
7 changed files with 655 additions and 33 deletions
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185
src/pcm/pcm_misc.c Normal file
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/*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include "pcm_local.h"
int snd_pcm_format_signed(int format)
{
switch (format) {
case SND_PCM_SFMT_S8:
case SND_PCM_SFMT_S16_LE:
case SND_PCM_SFMT_S16_BE:
case SND_PCM_SFMT_S24_LE:
case SND_PCM_SFMT_S24_BE:
case SND_PCM_SFMT_S32_LE:
case SND_PCM_SFMT_S32_BE:
return 1;
case SND_PCM_SFMT_U8:
case SND_PCM_SFMT_U16_LE:
case SND_PCM_SFMT_U16_BE:
case SND_PCM_SFMT_U24_LE:
case SND_PCM_SFMT_U24_BE:
case SND_PCM_SFMT_U32_LE:
case SND_PCM_SFMT_U32_BE:
return 0;
default:
return -EINVAL;
}
}
int snd_pcm_format_unsigned(int format)
{
int val;
val = snd_pcm_format_signed(format);
if (val >= 0)
val ^= 1;
return val;
}
int snd_pcm_format_little_endian(int format)
{
switch (format) {
case SND_PCM_SFMT_S16_LE:
case SND_PCM_SFMT_U16_LE:
case SND_PCM_SFMT_S24_LE:
case SND_PCM_SFMT_U24_LE:
case SND_PCM_SFMT_S32_LE:
case SND_PCM_SFMT_U32_LE:
case SND_PCM_SFMT_FLOAT_LE:
case SND_PCM_SFMT_FLOAT64_LE:
case SND_PCM_SFMT_IEC958_SUBFRAME_LE:
return 1;
case SND_PCM_SFMT_S16_BE:
case SND_PCM_SFMT_U16_BE:
case SND_PCM_SFMT_S24_BE:
case SND_PCM_SFMT_U24_BE:
case SND_PCM_SFMT_S32_BE:
case SND_PCM_SFMT_U32_BE:
case SND_PCM_SFMT_FLOAT_BE:
case SND_PCM_SFMT_FLOAT64_BE:
case SND_PCM_SFMT_IEC958_SUBFRAME_BE:
return 0;
default:
return -EINVAL;
}
}
int snd_pcm_format_big_endian(int format)
{
int val;
val = snd_pcm_format_little_endian(format);
if (val >= 0)
val ^= 1;
return val;
}
int snd_pcm_format_width(int format)
{
switch (format) {
case SND_PCM_SFMT_S8:
case SND_PCM_SFMT_U8:
return 8;
case SND_PCM_SFMT_S16_LE:
case SND_PCM_SFMT_S16_BE:
case SND_PCM_SFMT_U16_LE:
case SND_PCM_SFMT_U16_BE:
return 16;
case SND_PCM_SFMT_S24_LE:
case SND_PCM_SFMT_S24_BE:
case SND_PCM_SFMT_U24_LE:
case SND_PCM_SFMT_U24_BE:
return 24;
case SND_PCM_SFMT_S32_LE:
case SND_PCM_SFMT_S32_BE:
case SND_PCM_SFMT_U32_LE:
case SND_PCM_SFMT_U32_BE:
case SND_PCM_SFMT_FLOAT_LE:
case SND_PCM_SFMT_FLOAT_BE:
return 32;
case SND_PCM_SFMT_FLOAT64_LE:
case SND_PCM_SFMT_FLOAT64_BE:
return 64;
case SND_PCM_SFMT_IEC958_SUBFRAME_LE:
case SND_PCM_SFMT_IEC958_SUBFRAME_BE:
return 24;
case SND_PCM_SFMT_MU_LAW:
case SND_PCM_SFMT_A_LAW:
return 8;
case SND_PCM_SFMT_IMA_ADPCM:
return 4;
default:
return -EINVAL;
}
}
ssize_t snd_pcm_format_size(int format, size_t samples)
{
if (samples < 0)
return -EINVAL;
if (samples == 0)
return samples;
switch (format) {
case SND_PCM_SFMT_S8:
case SND_PCM_SFMT_U8:
return samples;
case SND_PCM_SFMT_S16_LE:
case SND_PCM_SFMT_S16_BE:
case SND_PCM_SFMT_U16_LE:
case SND_PCM_SFMT_U16_BE:
return samples * 2;
case SND_PCM_SFMT_S24_LE:
case SND_PCM_SFMT_S24_BE:
case SND_PCM_SFMT_U24_LE:
case SND_PCM_SFMT_U24_BE:
case SND_PCM_SFMT_S32_LE:
case SND_PCM_SFMT_S32_BE:
case SND_PCM_SFMT_U32_LE:
case SND_PCM_SFMT_U32_BE:
case SND_PCM_SFMT_FLOAT_LE:
case SND_PCM_SFMT_FLOAT_BE:
return samples * 4;
case SND_PCM_SFMT_FLOAT64_LE:
case SND_PCM_SFMT_FLOAT64_BE:
return samples * 8;
case SND_PCM_SFMT_IEC958_SUBFRAME_LE:
case SND_PCM_SFMT_IEC958_SUBFRAME_BE:
return samples * 4;
case SND_PCM_SFMT_MU_LAW:
case SND_PCM_SFMT_A_LAW:
return samples;
case SND_PCM_SFMT_IMA_ADPCM:
if (samples & 1)
return -EINVAL;
return samples / 2;
default:
return -EINVAL;
}
}