mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-11-10 13:30:01 -05:00
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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@ -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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@ -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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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
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* Copyright (c) 1999 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 <endian.h>
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#include <byteswap.h>
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#include "../pcm_local.h"
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/*
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* Basic rate conversion plugin
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*/
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struct rate_private_data {
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unsigned int src_rate;
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unsigned int dst_rate;
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unsigned int pitch;
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unsigned int pos;
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signed short last_L_S1, last_R_S1;
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};
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static void mix(struct rate_private_data *data,
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signed short *src_ptr, int src_size,
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signed short *dst_ptr, int dst_size)
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{
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unsigned int pos;
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signed int val;
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signed short L_S1, R_S1, L_S2, R_S2;
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pos = data->pos;
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L_S1 = L_S2 = data->last_L_S1;
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R_S1 = R_S2 = data->last_R_S1;
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while (dst_size-- > 0) {
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pos += data->pitch;
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src_ptr += (pos >> 10) * 2; pos &= 0x3ff;
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L_S2 = *src_ptr;
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val = L_S1 + ((L_S2 + L_S1) * (signed int)pos) / 1024;
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if (val < -32768)
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val = -32768;
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else if (val > 32767)
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val = 32767;
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*dst_ptr++ = val;
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R_S2 = *(src_ptr + 1);
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val = R_S1 + ((R_S2 + R_S1) * (signed int)pos) / 1024;
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if (val < -32768)
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val = -32768;
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else if (val > 32767)
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val = 32767;
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*dst_ptr++ = val;
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}
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data->last_L_S1 = L_S2;
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data->last_R_S1 = R_S2;
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data->pos = pos & 0x3ff;
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}
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static ssize_t rate_transfer(snd_pcm_plugin_t *plugin,
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char *src_ptr, size_t src_size,
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char *dst_ptr, size_t dst_size)
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{
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struct rate_private_data *data;
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if (plugin == NULL || src_ptr == NULL || src_size < 0 ||
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dst_ptr == NULL || dst_size < 0)
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return -EINVAL;
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if (src_size == 0)
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return 0;
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data = (struct rate_private_data *)snd_pcm_plugin_extra_data(plugin);
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if (data == NULL)
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return -EINVAL;
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mix(data, (signed short *)src_ptr, src_size / 4,
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(signed short *)dst_ptr, dst_size / 4);
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return (dst_size / 4) * 4;
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}
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static ssize_t rate_src_size(snd_pcm_plugin_t *plugin, size_t size)
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{
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struct rate_private_data *data;
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if (!plugin || size <= 0)
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return -EINVAL;
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data = (struct rate_private_data *)snd_pcm_plugin_extra_data(plugin);
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return (((size * data->pitch) + 0x1ff) >> 10) & ~3;
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}
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static ssize_t rate_dst_size(snd_pcm_plugin_t *plugin, size_t size)
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{
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struct rate_private_data *data;
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if (!plugin || size <= 0)
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return -EINVAL;
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data = (struct rate_private_data *)snd_pcm_plugin_extra_data(plugin);
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return (((size << 10) + (data->pitch / 2)) / data->pitch) & ~3;
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}
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int snd_pcm_plugin_build_rate(int src_format, int src_rate, int src_voices,
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int dst_format, int dst_rate, int dst_voices,
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snd_pcm_plugin_t **r_plugin)
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{
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struct rate_private_data *data;
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snd_pcm_plugin_t *plugin;
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if (!r_plugin)
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return -EINVAL;
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*r_plugin = NULL;
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if (src_voices != 2 || dst_voices != 2)
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return -EINVAL;
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if (src_format != SND_PCM_SFMT_S16_LE ||
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dst_format != SND_PCM_SFMT_S16_LE)
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return -EINVAL;
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if (src_rate == dst_rate)
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return -EINVAL;
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plugin = snd_pcm_plugin_build("rate format conversion",
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sizeof(struct rate_private_data));
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if (plugin == NULL)
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return -ENOMEM;
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data = (struct rate_private_data *)snd_pcm_plugin_extra_data(plugin);
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data->pitch = ((src_rate << 10) + (dst_rate >> 1)) / dst_rate;
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plugin->transfer = rate_transfer;
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plugin->src_size = rate_src_size;
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plugin->dst_size = rate_dst_size;
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*r_plugin = plugin;
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return 0;
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}
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207
src/pcm/plugin/voices.c
Normal file
207
src/pcm/plugin/voices.c
Normal file
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@ -0,0 +1,207 @@
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/*
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* Voices conversion Plug-In
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* Copyright (c) 1999 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 <endian.h>
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#include <byteswap.h>
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#include "../pcm_local.h"
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/*
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* Basic voices conversion plugin
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*/
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struct voices_private_data {
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int src_voices;
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int dst_voices;
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int width; /* in bites */
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int flg_merge: 1,
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flg_signed: 1;
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};
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static void divide_8bit(char *src_ptr, char *dst_ptr, int size)
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{
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while (size-- > 0) {
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*dst_ptr++ = *src_ptr;
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*dst_ptr++ = *src_ptr++;
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}
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}
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static void divide_16bit(short *src_ptr, short *dst_ptr, int size)
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{
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while (size-- > 0) {
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*dst_ptr++ = *src_ptr;
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*dst_ptr++ = *src_ptr++;
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}
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}
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static void merge_8bit_unsigned(unsigned char *src_ptr,
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unsigned char *dst_ptr,
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int size)
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{
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while (size-- > 0) {
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*dst_ptr++ = (*src_ptr + *(src_ptr + 1)) / 2;
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src_ptr += 2;
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}
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}
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static void merge_8bit_signed(signed char *src_ptr,
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signed char *dst_ptr,
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int size)
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{
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while (size-- > 0) {
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*dst_ptr++ = (*src_ptr + *(src_ptr + 1)) / 2;
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src_ptr += 2;
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}
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}
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static void merge_16bit_unsigned(unsigned short *src_ptr,
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unsigned short *dst_ptr,
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int size)
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{
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while (size-- > 0) {
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*dst_ptr++ = (*src_ptr + *(src_ptr + 1)) / 2;
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src_ptr += 2;
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}
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}
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static void merge_16bit_signed(signed short *src_ptr,
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signed short *dst_ptr,
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int size)
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{
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while (size-- > 0) {
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*dst_ptr++ = (*src_ptr + *(src_ptr + 1)) / 2;
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src_ptr += 2;
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}
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}
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static ssize_t voices_transfer(snd_pcm_plugin_t *plugin,
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char *src_ptr, size_t src_size,
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char *dst_ptr, size_t dst_size)
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{
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struct voices_private_data *data;
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if (plugin == NULL || src_ptr == NULL || src_size < 0 ||
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dst_ptr == NULL || dst_size < 0)
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return -EINVAL;
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if (src_size == 0)
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return 0;
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data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
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if (data == NULL)
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return -EINVAL;
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switch (data->width) {
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case 8:
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if (data->src_voices > data->dst_voices) {
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if (data->flg_signed) {
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merge_8bit_signed(src_ptr, dst_ptr, src_size / 2);
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} else {
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merge_8bit_unsigned(src_ptr, dst_ptr, src_size / 2);
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}
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return (src_size * data->src_voices) / data->dst_voices;
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} else {
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divide_8bit(src_ptr, dst_ptr, src_size);
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return (src_size * data->dst_voices) / data->src_voices;
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}
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break;
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case 16:
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if (data->src_voices > data->dst_voices) {
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if (data->flg_signed) {
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merge_16bit_signed((short *)src_ptr, (short *)dst_ptr, src_size / 4);
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} else {
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merge_16bit_unsigned((short *)src_ptr, (short *)dst_ptr, src_size / 4);
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}
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return (src_size * data->src_voices) / data->dst_voices;
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} else {
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divide_16bit((short *)src_ptr, (short *)dst_ptr, src_size / 2);
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return (src_size * data->dst_voices) / data->src_voices;
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}
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break;
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default:
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return -EINVAL;
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}
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}
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static ssize_t voices_src_size(snd_pcm_plugin_t *plugin, size_t size)
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{
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struct voices_private_data *data;
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if (!plugin || size <= 0)
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return -EINVAL;
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data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
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if (data->src_voices < data->dst_voices)
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return (size * data->src_voices) / data->dst_voices;
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else
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return (size * data->dst_voices) / data->src_voices;
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}
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static ssize_t voices_dst_size(snd_pcm_plugin_t *plugin, size_t size)
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{
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struct voices_private_data *data;
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if (!plugin || size <= 0)
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return -EINVAL;
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data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
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if (data->src_voices > data->dst_voices)
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return (size * data->src_voices) / data->dst_voices;
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else
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return (size * data->dst_voices) / data->src_voices;
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}
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int snd_pcm_plugin_build_voices(int src_format, int src_voices,
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int dst_format, int dst_voices,
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snd_pcm_plugin_t **r_plugin)
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{
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struct voices_private_data *data;
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snd_pcm_plugin_t *plugin;
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if (!r_plugin)
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return -EINVAL;
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*r_plugin = NULL;
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if (src_voices == dst_voices)
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return -EINVAL;
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if (src_voices < 1 || src_voices > 2 ||
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dst_voices < 1 || dst_voices > 2)
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return -EINVAL;
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if (src_format != dst_format)
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return -EINVAL;
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if (src_format < SND_PCM_SFMT_S8 || src_format > SND_PCM_SFMT_U16_BE) {
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if (src_format != SND_PCM_SFMT_MU_LAW && src_format != SND_PCM_SFMT_A_LAW)
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return -EINVAL;
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}
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plugin = snd_pcm_plugin_build("voices conversion",
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sizeof(struct voices_private_data));
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if (plugin == NULL)
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return -ENOMEM;
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data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
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data->src_voices = src_voices;
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data->dst_voices = dst_voices;
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data->width = snd_pcm_format_width(src_format);
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data->flg_merge = src_voices > dst_voices;
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data->flg_signed = snd_pcm_format_signed(src_format);
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plugin->transfer = voices_transfer;
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plugin->src_size = voices_src_size;
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plugin->dst_size = voices_dst_size;
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*r_plugin = plugin;
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return 0;
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}
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