mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-11-01 22:58:49 -04:00
Added new PCM functions (pcm_misc.c).
New plugins: rate, voices.
This commit is contained in:
Jaroslav Kysela
parent
a743444ef3
commit
4a01380a7b
7 changed files with 655 additions and 33 deletions
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@ -2,7 +2,7 @@ SUBDIRS = plugin
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EXTRA_LTLIBRARIES = libpcm.la
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libpcm_la_SOURCES = pcm.c pcm_plugin.c pcm_loopback.c
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libpcm_la_SOURCES = pcm.c pcm_plugin.c pcm_misc.c pcm_loopback.c
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libpcm_la_LIBADD = plugin/libpcmplugin.la
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all: libpcm.la
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185
src/pcm/pcm_misc.c
Normal file
185
src/pcm/pcm_misc.c
Normal file
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@ -0,0 +1,185 @@
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/*
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* PCM Interface - misc routines
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* Copyright (c) 1998 by Jaroslav Kysela <perex@suse.cz>
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*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include "pcm_local.h"
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int snd_pcm_format_signed(int format)
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{
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switch (format) {
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case SND_PCM_SFMT_S8:
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case SND_PCM_SFMT_S16_LE:
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case SND_PCM_SFMT_S16_BE:
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case SND_PCM_SFMT_S24_LE:
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case SND_PCM_SFMT_S24_BE:
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case SND_PCM_SFMT_S32_LE:
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case SND_PCM_SFMT_S32_BE:
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return 1;
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case SND_PCM_SFMT_U8:
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case SND_PCM_SFMT_U16_LE:
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case SND_PCM_SFMT_U16_BE:
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case SND_PCM_SFMT_U24_LE:
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case SND_PCM_SFMT_U24_BE:
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case SND_PCM_SFMT_U32_LE:
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case SND_PCM_SFMT_U32_BE:
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return 0;
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default:
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return -EINVAL;
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}
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}
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int snd_pcm_format_unsigned(int format)
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{
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int val;
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val = snd_pcm_format_signed(format);
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if (val >= 0)
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val ^= 1;
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return val;
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}
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int snd_pcm_format_little_endian(int format)
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{
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switch (format) {
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case SND_PCM_SFMT_S16_LE:
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case SND_PCM_SFMT_U16_LE:
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case SND_PCM_SFMT_S24_LE:
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case SND_PCM_SFMT_U24_LE:
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case SND_PCM_SFMT_S32_LE:
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case SND_PCM_SFMT_U32_LE:
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case SND_PCM_SFMT_FLOAT_LE:
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case SND_PCM_SFMT_FLOAT64_LE:
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case SND_PCM_SFMT_IEC958_SUBFRAME_LE:
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return 1;
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case SND_PCM_SFMT_S16_BE:
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case SND_PCM_SFMT_U16_BE:
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case SND_PCM_SFMT_S24_BE:
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case SND_PCM_SFMT_U24_BE:
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case SND_PCM_SFMT_S32_BE:
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case SND_PCM_SFMT_U32_BE:
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case SND_PCM_SFMT_FLOAT_BE:
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case SND_PCM_SFMT_FLOAT64_BE:
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case SND_PCM_SFMT_IEC958_SUBFRAME_BE:
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return 0;
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default:
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return -EINVAL;
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}
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}
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int snd_pcm_format_big_endian(int format)
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{
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int val;
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val = snd_pcm_format_little_endian(format);
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if (val >= 0)
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val ^= 1;
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return val;
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}
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int snd_pcm_format_width(int format)
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{
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switch (format) {
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case SND_PCM_SFMT_S8:
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case SND_PCM_SFMT_U8:
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return 8;
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case SND_PCM_SFMT_S16_LE:
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case SND_PCM_SFMT_S16_BE:
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case SND_PCM_SFMT_U16_LE:
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case SND_PCM_SFMT_U16_BE:
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return 16;
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case SND_PCM_SFMT_S24_LE:
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case SND_PCM_SFMT_S24_BE:
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case SND_PCM_SFMT_U24_LE:
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case SND_PCM_SFMT_U24_BE:
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return 24;
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case SND_PCM_SFMT_S32_LE:
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case SND_PCM_SFMT_S32_BE:
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case SND_PCM_SFMT_U32_LE:
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case SND_PCM_SFMT_U32_BE:
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case SND_PCM_SFMT_FLOAT_LE:
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case SND_PCM_SFMT_FLOAT_BE:
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return 32;
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case SND_PCM_SFMT_FLOAT64_LE:
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case SND_PCM_SFMT_FLOAT64_BE:
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return 64;
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case SND_PCM_SFMT_IEC958_SUBFRAME_LE:
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case SND_PCM_SFMT_IEC958_SUBFRAME_BE:
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return 24;
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case SND_PCM_SFMT_MU_LAW:
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case SND_PCM_SFMT_A_LAW:
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return 8;
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case SND_PCM_SFMT_IMA_ADPCM:
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return 4;
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default:
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return -EINVAL;
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}
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}
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ssize_t snd_pcm_format_size(int format, size_t samples)
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{
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if (samples < 0)
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return -EINVAL;
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if (samples == 0)
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return samples;
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switch (format) {
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case SND_PCM_SFMT_S8:
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case SND_PCM_SFMT_U8:
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return samples;
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case SND_PCM_SFMT_S16_LE:
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case SND_PCM_SFMT_S16_BE:
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case SND_PCM_SFMT_U16_LE:
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case SND_PCM_SFMT_U16_BE:
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return samples * 2;
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case SND_PCM_SFMT_S24_LE:
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case SND_PCM_SFMT_S24_BE:
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case SND_PCM_SFMT_U24_LE:
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case SND_PCM_SFMT_U24_BE:
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case SND_PCM_SFMT_S32_LE:
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case SND_PCM_SFMT_S32_BE:
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case SND_PCM_SFMT_U32_LE:
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case SND_PCM_SFMT_U32_BE:
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case SND_PCM_SFMT_FLOAT_LE:
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case SND_PCM_SFMT_FLOAT_BE:
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return samples * 4;
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case SND_PCM_SFMT_FLOAT64_LE:
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case SND_PCM_SFMT_FLOAT64_BE:
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return samples * 8;
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case SND_PCM_SFMT_IEC958_SUBFRAME_LE:
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case SND_PCM_SFMT_IEC958_SUBFRAME_BE:
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return samples * 4;
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case SND_PCM_SFMT_MU_LAW:
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case SND_PCM_SFMT_A_LAW:
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return samples;
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case SND_PCM_SFMT_IMA_ADPCM:
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if (samples & 1)
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return -EINVAL;
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return samples / 2;
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default:
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return -EINVAL;
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}
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}
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@ -97,6 +97,22 @@ int snd_pcm_plugin_insert(snd_pcm_t *pcm, int channel, snd_pcm_plugin_t *plugin)
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return 0;
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}
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int snd_pcm_plugin_append(snd_pcm_t *pcm, int channel, snd_pcm_plugin_t *plugin)
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{
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if (!pcm || channel < 0 || channel > 1 || !plugin)
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return -EINVAL;
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plugin->next = NULL;
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plugin->prev = pcm->plugin_last[channel];
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if (pcm->plugin_last[channel]) {
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pcm->plugin_last[channel]->next = plugin;
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pcm->plugin_last[channel] = plugin;
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} else {
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pcm->plugin_last[channel] =
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pcm->plugin_first[channel] = plugin;
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}
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return 0;
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}
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int snd_pcm_plugin_remove_to(snd_pcm_t *pcm, int channel, snd_pcm_plugin_t *plugin)
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{
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snd_pcm_plugin_t *plugin1, *plugin1_prev;
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@ -247,6 +263,9 @@ int snd_pcm_plugin_info(snd_pcm_t *pcm, snd_pcm_channel_info_t *info)
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if ((err = snd_pcm_channel_info(pcm, info)) < 0)
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return err;
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info->formats = snd_pcm_plugin_formats(pcm, info->formats);
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info->min_rate = 4000;
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info->max_rate = 192000;
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info->rates = SND_PCM_RATE_8000_48000;
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return 0;
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}
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@ -372,25 +391,90 @@ int snd_pcm_plugin_params(snd_pcm_t *pcm, snd_pcm_channel_params_t *params)
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*/
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snd_pcm_plugin_clear(pcm, params->channel);
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if (sinfo.mode == SND_PCM_MODE_STREAM) {
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err = snd_pcm_plugin_build_stream(pcm, params->channel, &plugin);
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} else if (sinfo.mode == SND_PCM_MODE_BLOCK) {
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if (sinfo.flags & SND_PCM_CHNINFO_MMAP) {
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err = snd_pcm_plugin_build_mmap(pcm, params->channel, &plugin);
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} else {
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err = snd_pcm_plugin_build_block(pcm, params->channel, &plugin);
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if (sparams.format.voices < sinfo.min_voices ||
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sparams.format.voices > sinfo.max_voices) {
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int src_voices = sparams.format.voices;
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int dst_voices = sparams.format.voices < sinfo.min_voices ?
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sinfo.min_voices : sinfo.max_voices;
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if (sparams.format.rate < sinfo.min_rate ||
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sparams.format.rate > sinfo.max_rate)
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dst_voices = 2;
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sparams.format.voices = dst_voices;
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swap_formats(params->channel, &src_voices, &dst_voices);
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err = snd_pcm_plugin_build_voices(params->format.format, src_voices,
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params->format.format, dst_voices,
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&plugin);
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if (err < 0) {
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snd_pcm_plugin_free(plugin);
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return err;
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}
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err = snd_pcm_plugin_append(pcm, params->channel, plugin);
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if (err < 0) {
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snd_pcm_plugin_free(plugin);
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return err;
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}
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} else {
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return -EINVAL;
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}
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/*
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* formats
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*/
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if (params->format.format == sparams.format.format)
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goto __format_skip;
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/* build additional plugins for conversion */
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switch (params->format.format) {
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case SND_PCM_SFMT_MU_LAW:
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srcfmt = SND_PCM_SFMT_MU_LAW;
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dstfmt = sparams.format.format;
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swap_formats(params->channel, &srcfmt, &dstfmt);
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err = snd_pcm_plugin_build_mulaw(srcfmt, dstfmt, &plugin);
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break;
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default:
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srcfmt = params->format.format;
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dstfmt = sparams.format.format;
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swap_formats(params->channel, &srcfmt, &dstfmt);
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err = snd_pcm_plugin_build_linear(srcfmt, dstfmt, &plugin);
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}
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if (err < 0)
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return err;
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err = snd_pcm_plugin_insert(pcm, params->channel, plugin);
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err = snd_pcm_plugin_append(pcm, params->channel, plugin);
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if (err < 0) {
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snd_pcm_plugin_free(plugin);
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return err;
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}
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__format_skip:
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/*
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* rate
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*/
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if (sparams.format.rate < sinfo.min_rate ||
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sparams.format.rate > sinfo.max_rate) {
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int src_rate = sparams.format.rate;
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int dst_rate = sparams.format.rate < sinfo.min_rate ?
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sinfo.min_rate : sinfo.max_rate;
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sparams.format.rate = dst_rate;
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swap_formats(params->channel, &src_rate, &dst_rate);
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err = snd_pcm_plugin_build_rate(sparams.format.format, src_rate, sparams.format.voices,
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sparams.format.format, dst_rate, sparams.format.voices,
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&plugin);
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if (err < 0) {
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snd_pcm_plugin_free(plugin);
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return err;
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}
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err = snd_pcm_plugin_append(pcm, params->channel, plugin);
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if (err < 0) {
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snd_pcm_plugin_free(plugin);
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return err;
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}
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}
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/*
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* interleave
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*/
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if (params->format.voices > 1 && sinfo.mode == SND_PCM_MODE_BLOCK) {
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int src_interleave, dst_interleave;
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@ -409,7 +493,7 @@ int snd_pcm_plugin_params(snd_pcm_t *pcm, snd_pcm_channel_params_t *params)
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err = snd_pcm_plugin_build_interleave(src_interleave, dst_interleave, sparams.format.format, &plugin);
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if (err < 0)
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return err;
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err = snd_pcm_plugin_insert(pcm, params->channel, plugin);
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err = snd_pcm_plugin_append(pcm, params->channel, plugin);
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if (err < 0) {
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snd_pcm_plugin_free(plugin);
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return err;
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@ -417,31 +501,33 @@ int snd_pcm_plugin_params(snd_pcm_t *pcm, snd_pcm_channel_params_t *params)
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}
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}
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if (params->format.format == sparams.format.format)
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goto __skip;
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/* build additional plugins for conversion */
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switch (params->format.format) {
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case SND_PCM_SFMT_MU_LAW:
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srcfmt = SND_PCM_SFMT_MU_LAW;
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dstfmt = sparams.format.format;
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swap_formats(params->channel, &srcfmt, &dstfmt);
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err = snd_pcm_plugin_build_mulaw(srcfmt, dstfmt, &plugin);
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break;
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default:
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srcfmt = params->format.format;
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dstfmt = sparams.format.format;
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swap_formats(params->channel, &srcfmt, &dstfmt);
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err = snd_pcm_plugin_build_linear(srcfmt, dstfmt, &plugin);
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/*
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* I/O plugins
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*/
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if (sinfo.mode == SND_PCM_MODE_STREAM) {
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err = snd_pcm_plugin_build_stream(pcm, params->channel, &plugin);
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} else if (sinfo.mode == SND_PCM_MODE_BLOCK) {
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if (sinfo.flags & SND_PCM_CHNINFO_MMAP) {
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err = snd_pcm_plugin_build_mmap(pcm, params->channel, &plugin);
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} else {
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err = snd_pcm_plugin_build_block(pcm, params->channel, &plugin);
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}
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} else {
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return -EINVAL;
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}
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if (err < 0)
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return err;
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err = snd_pcm_plugin_insert(pcm, params->channel, plugin);
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err = snd_pcm_plugin_append(pcm, params->channel, plugin);
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if (err < 0) {
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snd_pcm_plugin_free(plugin);
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return err;
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}
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__skip:
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/*
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* ratio
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*/
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ratio = snd_pcm_plugin_hardware_ratio(pcm, params->channel);
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if (ratio <= 0)
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return -EINVAL;
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|
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@ -1,7 +1,7 @@
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EXTRA_LTLIBRARIES = libpcmplugin.la
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libpcmplugin_la_SOURCES = block.c mmap.c stream.c linear.c interleave.c \
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mulaw.c
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mulaw.c rate.c voices.c
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all: libpcmplugin.la
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|
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@ -330,10 +330,10 @@ int snd_pcm_plugin_build_linear(int src_format, int dst_format, snd_pcm_plugin_t
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return -EINVAL;
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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endian1 = endian1 == __BIG_ENDIAN ? 1 : 0;
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endian1 = endian2 == __BIG_ENDIAN ? 1 : 0;
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endian2 = endian2 == __BIG_ENDIAN ? 1 : 0;
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#elif __BYTE_ORDER == __BIG_ENDIAN
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endian1 = endian1 == __LITTLE_ENDIAN ? 1 : 0;
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endian1 = endian2 == __LITTLE_ENDIAN ? 1 : 0;
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endian2 = endian2 == __LITTLE_ENDIAN ? 1 : 0;
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#else
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#error "Unsupported endian..."
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#endif
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@ -380,7 +380,7 @@ int snd_pcm_plugin_build_linear(int src_format, int dst_format, snd_pcm_plugin_t
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return -ENOMEM;
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data = (struct linear_private_data *)snd_pcm_plugin_extra_data(plugin);
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data->cmd = cmd;
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if (!endian1 && !endian2) {
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if (endian1 == endian2) {
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data->endian = NONE;
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} else if (endian1 && !endian2) {
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data->endian = SOURCE;
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|
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144
src/pcm/plugin/rate.c
Normal file
144
src/pcm/plugin/rate.c
Normal file
|
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@ -0,0 +1,144 @@
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/*
|
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* Rate conversion Plug-In
|
||||
* Copyright (c) 1999 by Jaroslav Kysela <perex@suse.cz>
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||||
*
|
||||
*
|
||||
* 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 <endian.h>
|
||||
#include <byteswap.h>
|
||||
#include "../pcm_local.h"
|
||||
|
||||
/*
|
||||
* Basic rate conversion plugin
|
||||
*/
|
||||
|
||||
struct rate_private_data {
|
||||
unsigned int src_rate;
|
||||
unsigned int dst_rate;
|
||||
unsigned int pitch;
|
||||
unsigned int pos;
|
||||
signed short last_L_S1, last_R_S1;
|
||||
};
|
||||
|
||||
static void mix(struct rate_private_data *data,
|
||||
signed short *src_ptr, int src_size,
|
||||
signed short *dst_ptr, int dst_size)
|
||||
{
|
||||
unsigned int pos;
|
||||
signed int val;
|
||||
signed short L_S1, R_S1, L_S2, R_S2;
|
||||
|
||||
pos = data->pos;
|
||||
L_S1 = L_S2 = data->last_L_S1;
|
||||
R_S1 = R_S2 = data->last_R_S1;
|
||||
while (dst_size-- > 0) {
|
||||
pos += data->pitch;
|
||||
src_ptr += (pos >> 10) * 2; pos &= 0x3ff;
|
||||
L_S2 = *src_ptr;
|
||||
val = L_S1 + ((L_S2 + L_S1) * (signed int)pos) / 1024;
|
||||
if (val < -32768)
|
||||
val = -32768;
|
||||
else if (val > 32767)
|
||||
val = 32767;
|
||||
*dst_ptr++ = val;
|
||||
R_S2 = *(src_ptr + 1);
|
||||
val = R_S1 + ((R_S2 + R_S1) * (signed int)pos) / 1024;
|
||||
if (val < -32768)
|
||||
val = -32768;
|
||||
else if (val > 32767)
|
||||
val = 32767;
|
||||
*dst_ptr++ = val;
|
||||
}
|
||||
data->last_L_S1 = L_S2;
|
||||
data->last_R_S1 = R_S2;
|
||||
data->pos = pos & 0x3ff;
|
||||
}
|
||||
|
||||
static ssize_t rate_transfer(snd_pcm_plugin_t *plugin,
|
||||
char *src_ptr, size_t src_size,
|
||||
char *dst_ptr, size_t dst_size)
|
||||
{
|
||||
struct rate_private_data *data;
|
||||
|
||||
if (plugin == NULL || src_ptr == NULL || src_size < 0 ||
|
||||
dst_ptr == NULL || dst_size < 0)
|
||||
return -EINVAL;
|
||||
if (src_size == 0)
|
||||
return 0;
|
||||
data = (struct rate_private_data *)snd_pcm_plugin_extra_data(plugin);
|
||||
if (data == NULL)
|
||||
return -EINVAL;
|
||||
mix(data, (signed short *)src_ptr, src_size / 4,
|
||||
(signed short *)dst_ptr, dst_size / 4);
|
||||
return (dst_size / 4) * 4;
|
||||
}
|
||||
|
||||
static ssize_t rate_src_size(snd_pcm_plugin_t *plugin, size_t size)
|
||||
{
|
||||
struct rate_private_data *data;
|
||||
|
||||
if (!plugin || size <= 0)
|
||||
return -EINVAL;
|
||||
data = (struct rate_private_data *)snd_pcm_plugin_extra_data(plugin);
|
||||
return (((size * data->pitch) + 0x1ff) >> 10) & ~3;
|
||||
}
|
||||
|
||||
static ssize_t rate_dst_size(snd_pcm_plugin_t *plugin, size_t size)
|
||||
{
|
||||
struct rate_private_data *data;
|
||||
|
||||
if (!plugin || size <= 0)
|
||||
return -EINVAL;
|
||||
data = (struct rate_private_data *)snd_pcm_plugin_extra_data(plugin);
|
||||
return (((size << 10) + (data->pitch / 2)) / data->pitch) & ~3;
|
||||
}
|
||||
|
||||
int snd_pcm_plugin_build_rate(int src_format, int src_rate, int src_voices,
|
||||
int dst_format, int dst_rate, int dst_voices,
|
||||
snd_pcm_plugin_t **r_plugin)
|
||||
{
|
||||
struct rate_private_data *data;
|
||||
snd_pcm_plugin_t *plugin;
|
||||
|
||||
if (!r_plugin)
|
||||
return -EINVAL;
|
||||
*r_plugin = NULL;
|
||||
if (src_voices != 2 || dst_voices != 2)
|
||||
return -EINVAL;
|
||||
if (src_format != SND_PCM_SFMT_S16_LE ||
|
||||
dst_format != SND_PCM_SFMT_S16_LE)
|
||||
return -EINVAL;
|
||||
if (src_rate == dst_rate)
|
||||
return -EINVAL;
|
||||
plugin = snd_pcm_plugin_build("rate format conversion",
|
||||
sizeof(struct rate_private_data));
|
||||
if (plugin == NULL)
|
||||
return -ENOMEM;
|
||||
data = (struct rate_private_data *)snd_pcm_plugin_extra_data(plugin);
|
||||
data->pitch = ((src_rate << 10) + (dst_rate >> 1)) / dst_rate;
|
||||
plugin->transfer = rate_transfer;
|
||||
plugin->src_size = rate_src_size;
|
||||
plugin->dst_size = rate_dst_size;
|
||||
*r_plugin = plugin;
|
||||
return 0;
|
||||
}
|
||||
207
src/pcm/plugin/voices.c
Normal file
207
src/pcm/plugin/voices.c
Normal file
|
|
@ -0,0 +1,207 @@
|
|||
/*
|
||||
* Voices conversion Plug-In
|
||||
* Copyright (c) 1999 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 <endian.h>
|
||||
#include <byteswap.h>
|
||||
#include "../pcm_local.h"
|
||||
|
||||
/*
|
||||
* Basic voices conversion plugin
|
||||
*/
|
||||
|
||||
struct voices_private_data {
|
||||
int src_voices;
|
||||
int dst_voices;
|
||||
int width; /* in bites */
|
||||
int flg_merge: 1,
|
||||
flg_signed: 1;
|
||||
};
|
||||
|
||||
static void divide_8bit(char *src_ptr, char *dst_ptr, int size)
|
||||
{
|
||||
while (size-- > 0) {
|
||||
*dst_ptr++ = *src_ptr;
|
||||
*dst_ptr++ = *src_ptr++;
|
||||
}
|
||||
}
|
||||
|
||||
static void divide_16bit(short *src_ptr, short *dst_ptr, int size)
|
||||
{
|
||||
while (size-- > 0) {
|
||||
*dst_ptr++ = *src_ptr;
|
||||
*dst_ptr++ = *src_ptr++;
|
||||
}
|
||||
}
|
||||
|
||||
static void merge_8bit_unsigned(unsigned char *src_ptr,
|
||||
unsigned char *dst_ptr,
|
||||
int size)
|
||||
{
|
||||
while (size-- > 0) {
|
||||
*dst_ptr++ = (*src_ptr + *(src_ptr + 1)) / 2;
|
||||
src_ptr += 2;
|
||||
}
|
||||
}
|
||||
|
||||
static void merge_8bit_signed(signed char *src_ptr,
|
||||
signed char *dst_ptr,
|
||||
int size)
|
||||
{
|
||||
while (size-- > 0) {
|
||||
*dst_ptr++ = (*src_ptr + *(src_ptr + 1)) / 2;
|
||||
src_ptr += 2;
|
||||
}
|
||||
}
|
||||
|
||||
static void merge_16bit_unsigned(unsigned short *src_ptr,
|
||||
unsigned short *dst_ptr,
|
||||
int size)
|
||||
{
|
||||
while (size-- > 0) {
|
||||
*dst_ptr++ = (*src_ptr + *(src_ptr + 1)) / 2;
|
||||
src_ptr += 2;
|
||||
}
|
||||
}
|
||||
|
||||
static void merge_16bit_signed(signed short *src_ptr,
|
||||
signed short *dst_ptr,
|
||||
int size)
|
||||
{
|
||||
while (size-- > 0) {
|
||||
*dst_ptr++ = (*src_ptr + *(src_ptr + 1)) / 2;
|
||||
src_ptr += 2;
|
||||
}
|
||||
}
|
||||
|
||||
static ssize_t voices_transfer(snd_pcm_plugin_t *plugin,
|
||||
char *src_ptr, size_t src_size,
|
||||
char *dst_ptr, size_t dst_size)
|
||||
{
|
||||
struct voices_private_data *data;
|
||||
|
||||
if (plugin == NULL || src_ptr == NULL || src_size < 0 ||
|
||||
dst_ptr == NULL || dst_size < 0)
|
||||
return -EINVAL;
|
||||
if (src_size == 0)
|
||||
return 0;
|
||||
data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
|
||||
if (data == NULL)
|
||||
return -EINVAL;
|
||||
switch (data->width) {
|
||||
case 8:
|
||||
if (data->src_voices > data->dst_voices) {
|
||||
if (data->flg_signed) {
|
||||
merge_8bit_signed(src_ptr, dst_ptr, src_size / 2);
|
||||
} else {
|
||||
merge_8bit_unsigned(src_ptr, dst_ptr, src_size / 2);
|
||||
}
|
||||
return (src_size * data->src_voices) / data->dst_voices;
|
||||
} else {
|
||||
divide_8bit(src_ptr, dst_ptr, src_size);
|
||||
return (src_size * data->dst_voices) / data->src_voices;
|
||||
}
|
||||
break;
|
||||
case 16:
|
||||
if (data->src_voices > data->dst_voices) {
|
||||
if (data->flg_signed) {
|
||||
merge_16bit_signed((short *)src_ptr, (short *)dst_ptr, src_size / 4);
|
||||
} else {
|
||||
merge_16bit_unsigned((short *)src_ptr, (short *)dst_ptr, src_size / 4);
|
||||
}
|
||||
return (src_size * data->src_voices) / data->dst_voices;
|
||||
} else {
|
||||
divide_16bit((short *)src_ptr, (short *)dst_ptr, src_size / 2);
|
||||
return (src_size * data->dst_voices) / data->src_voices;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static ssize_t voices_src_size(snd_pcm_plugin_t *plugin, size_t size)
|
||||
{
|
||||
struct voices_private_data *data;
|
||||
|
||||
if (!plugin || size <= 0)
|
||||
return -EINVAL;
|
||||
data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
|
||||
if (data->src_voices < data->dst_voices)
|
||||
return (size * data->src_voices) / data->dst_voices;
|
||||
else
|
||||
return (size * data->dst_voices) / data->src_voices;
|
||||
}
|
||||
|
||||
static ssize_t voices_dst_size(snd_pcm_plugin_t *plugin, size_t size)
|
||||
{
|
||||
struct voices_private_data *data;
|
||||
|
||||
if (!plugin || size <= 0)
|
||||
return -EINVAL;
|
||||
data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
|
||||
if (data->src_voices > data->dst_voices)
|
||||
return (size * data->src_voices) / data->dst_voices;
|
||||
else
|
||||
return (size * data->dst_voices) / data->src_voices;
|
||||
}
|
||||
|
||||
int snd_pcm_plugin_build_voices(int src_format, int src_voices,
|
||||
int dst_format, int dst_voices,
|
||||
snd_pcm_plugin_t **r_plugin)
|
||||
{
|
||||
struct voices_private_data *data;
|
||||
snd_pcm_plugin_t *plugin;
|
||||
|
||||
if (!r_plugin)
|
||||
return -EINVAL;
|
||||
*r_plugin = NULL;
|
||||
if (src_voices == dst_voices)
|
||||
return -EINVAL;
|
||||
if (src_voices < 1 || src_voices > 2 ||
|
||||
dst_voices < 1 || dst_voices > 2)
|
||||
return -EINVAL;
|
||||
if (src_format != dst_format)
|
||||
return -EINVAL;
|
||||
if (src_format < SND_PCM_SFMT_S8 || src_format > SND_PCM_SFMT_U16_BE) {
|
||||
if (src_format != SND_PCM_SFMT_MU_LAW && src_format != SND_PCM_SFMT_A_LAW)
|
||||
return -EINVAL;
|
||||
}
|
||||
plugin = snd_pcm_plugin_build("voices conversion",
|
||||
sizeof(struct voices_private_data));
|
||||
if (plugin == NULL)
|
||||
return -ENOMEM;
|
||||
data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
|
||||
data->src_voices = src_voices;
|
||||
data->dst_voices = dst_voices;
|
||||
data->width = snd_pcm_format_width(src_format);
|
||||
data->flg_merge = src_voices > dst_voices;
|
||||
data->flg_signed = snd_pcm_format_signed(src_format);
|
||||
plugin->transfer = voices_transfer;
|
||||
plugin->src_size = voices_src_size;
|
||||
plugin->dst_size = voices_dst_size;
|
||||
*r_plugin = plugin;
|
||||
return 0;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue