769 строки
22 KiB
C
769 строки
22 KiB
C
/*
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* PCM Plug-In shared (kernel/library) code
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* Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz>
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* Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#if 0
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#define PLUGIN_DEBUG
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#endif
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/vmalloc.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include "pcm_plugin.h"
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#define snd_pcm_plug_first(plug) ((plug)->runtime->oss.plugin_first)
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#define snd_pcm_plug_last(plug) ((plug)->runtime->oss.plugin_last)
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/*
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* because some cards might have rates "very close", we ignore
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* all "resampling" requests within +-5%
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*/
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static int rate_match(unsigned int src_rate, unsigned int dst_rate)
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{
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unsigned int low = (src_rate * 95) / 100;
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unsigned int high = (src_rate * 105) / 100;
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return dst_rate >= low && dst_rate <= high;
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}
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static int snd_pcm_plugin_alloc(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames)
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{
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struct snd_pcm_plugin_format *format;
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ssize_t width;
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size_t size;
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unsigned int channel;
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struct snd_pcm_plugin_channel *c;
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if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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format = &plugin->src_format;
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} else {
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format = &plugin->dst_format;
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}
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if ((width = snd_pcm_format_physical_width(format->format)) < 0)
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return width;
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size = frames * format->channels * width;
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if (snd_BUG_ON(size % 8))
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return -ENXIO;
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size /= 8;
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if (plugin->buf_frames < frames) {
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kvfree(plugin->buf);
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plugin->buf = kvzalloc(size, GFP_KERNEL);
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plugin->buf_frames = frames;
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}
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if (!plugin->buf) {
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plugin->buf_frames = 0;
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return -ENOMEM;
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}
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c = plugin->buf_channels;
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if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
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for (channel = 0; channel < format->channels; channel++, c++) {
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c->frames = frames;
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c->enabled = 1;
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c->wanted = 0;
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c->area.addr = plugin->buf;
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c->area.first = channel * width;
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c->area.step = format->channels * width;
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}
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} else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
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if (snd_BUG_ON(size % format->channels))
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return -EINVAL;
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size /= format->channels;
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for (channel = 0; channel < format->channels; channel++, c++) {
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c->frames = frames;
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c->enabled = 1;
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c->wanted = 0;
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c->area.addr = plugin->buf + (channel * size);
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c->area.first = 0;
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c->area.step = width;
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}
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} else
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return -EINVAL;
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return 0;
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}
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int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
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{
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int err;
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if (snd_BUG_ON(!snd_pcm_plug_first(plug)))
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return -ENXIO;
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if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
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struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug);
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while (plugin->next) {
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if (plugin->dst_frames)
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frames = plugin->dst_frames(plugin, frames);
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if (snd_BUG_ON((snd_pcm_sframes_t)frames <= 0))
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return -ENXIO;
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plugin = plugin->next;
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err = snd_pcm_plugin_alloc(plugin, frames);
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if (err < 0)
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return err;
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}
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} else {
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struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug);
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while (plugin->prev) {
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if (plugin->src_frames)
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frames = plugin->src_frames(plugin, frames);
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if (snd_BUG_ON((snd_pcm_sframes_t)frames <= 0))
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return -ENXIO;
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plugin = plugin->prev;
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err = snd_pcm_plugin_alloc(plugin, frames);
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if (err < 0)
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return err;
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}
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}
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return 0;
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}
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snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
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snd_pcm_uframes_t frames,
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struct snd_pcm_plugin_channel **channels)
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{
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*channels = plugin->buf_channels;
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return frames;
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}
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int snd_pcm_plugin_build(struct snd_pcm_substream *plug,
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const char *name,
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struct snd_pcm_plugin_format *src_format,
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struct snd_pcm_plugin_format *dst_format,
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size_t extra,
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struct snd_pcm_plugin **ret)
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{
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struct snd_pcm_plugin *plugin;
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unsigned int channels;
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if (snd_BUG_ON(!plug))
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return -ENXIO;
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if (snd_BUG_ON(!src_format || !dst_format))
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return -ENXIO;
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plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL);
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if (plugin == NULL)
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return -ENOMEM;
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plugin->name = name;
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plugin->plug = plug;
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plugin->stream = snd_pcm_plug_stream(plug);
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plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
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plugin->src_format = *src_format;
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plugin->src_width = snd_pcm_format_physical_width(src_format->format);
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snd_BUG_ON(plugin->src_width <= 0);
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plugin->dst_format = *dst_format;
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plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
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snd_BUG_ON(plugin->dst_width <= 0);
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if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)
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channels = src_format->channels;
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else
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channels = dst_format->channels;
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plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL);
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if (plugin->buf_channels == NULL) {
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snd_pcm_plugin_free(plugin);
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return -ENOMEM;
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}
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plugin->client_channels = snd_pcm_plugin_client_channels;
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*ret = plugin;
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return 0;
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}
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int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
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{
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if (! plugin)
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return 0;
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if (plugin->private_free)
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plugin->private_free(plugin);
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kfree(plugin->buf_channels);
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kvfree(plugin->buf);
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kfree(plugin);
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return 0;
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}
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snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
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{
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struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
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int stream;
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if (snd_BUG_ON(!plug))
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return -ENXIO;
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if (drv_frames == 0)
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return 0;
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stream = snd_pcm_plug_stream(plug);
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if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
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plugin = snd_pcm_plug_last(plug);
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while (plugin && drv_frames > 0) {
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plugin_prev = plugin->prev;
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if (plugin->src_frames)
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drv_frames = plugin->src_frames(plugin, drv_frames);
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plugin = plugin_prev;
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}
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} else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
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plugin = snd_pcm_plug_first(plug);
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while (plugin && drv_frames > 0) {
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plugin_next = plugin->next;
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if (plugin->dst_frames)
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drv_frames = plugin->dst_frames(plugin, drv_frames);
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plugin = plugin_next;
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}
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} else
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snd_BUG();
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return drv_frames;
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}
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snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
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{
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struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
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snd_pcm_sframes_t frames;
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int stream;
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if (snd_BUG_ON(!plug))
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return -ENXIO;
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if (clt_frames == 0)
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return 0;
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frames = clt_frames;
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stream = snd_pcm_plug_stream(plug);
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if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
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plugin = snd_pcm_plug_first(plug);
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while (plugin && frames > 0) {
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plugin_next = plugin->next;
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if (plugin->dst_frames) {
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frames = plugin->dst_frames(plugin, frames);
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if (frames < 0)
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return frames;
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}
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plugin = plugin_next;
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}
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} else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
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plugin = snd_pcm_plug_last(plug);
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while (plugin) {
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plugin_prev = plugin->prev;
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if (plugin->src_frames) {
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frames = plugin->src_frames(plugin, frames);
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if (frames < 0)
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return frames;
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}
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plugin = plugin_prev;
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}
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} else
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snd_BUG();
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return frames;
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}
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static int snd_pcm_plug_formats(const struct snd_mask *mask,
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snd_pcm_format_t format)
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{
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struct snd_mask formats = *mask;
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u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
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SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
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SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
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SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
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SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
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SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
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SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
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SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
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snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW);
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if (formats.bits[0] & lower_32_bits(linfmts))
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formats.bits[0] |= lower_32_bits(linfmts);
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if (formats.bits[1] & upper_32_bits(linfmts))
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formats.bits[1] |= upper_32_bits(linfmts);
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return snd_mask_test(&formats, (__force int)format);
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}
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static snd_pcm_format_t preferred_formats[] = {
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SNDRV_PCM_FORMAT_S16_LE,
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SNDRV_PCM_FORMAT_S16_BE,
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SNDRV_PCM_FORMAT_U16_LE,
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SNDRV_PCM_FORMAT_U16_BE,
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SNDRV_PCM_FORMAT_S24_3LE,
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SNDRV_PCM_FORMAT_S24_3BE,
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SNDRV_PCM_FORMAT_U24_3LE,
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SNDRV_PCM_FORMAT_U24_3BE,
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SNDRV_PCM_FORMAT_S24_LE,
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SNDRV_PCM_FORMAT_S24_BE,
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SNDRV_PCM_FORMAT_U24_LE,
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SNDRV_PCM_FORMAT_U24_BE,
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SNDRV_PCM_FORMAT_S32_LE,
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SNDRV_PCM_FORMAT_S32_BE,
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SNDRV_PCM_FORMAT_U32_LE,
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SNDRV_PCM_FORMAT_U32_BE,
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SNDRV_PCM_FORMAT_S8,
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SNDRV_PCM_FORMAT_U8
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};
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snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
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const struct snd_mask *format_mask)
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{
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int i;
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if (snd_mask_test(format_mask, (__force int)format))
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return format;
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if (!snd_pcm_plug_formats(format_mask, format))
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return (__force snd_pcm_format_t)-EINVAL;
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if (snd_pcm_format_linear(format)) {
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unsigned int width = snd_pcm_format_width(format);
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int unsignd = snd_pcm_format_unsigned(format) > 0;
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int big = snd_pcm_format_big_endian(format) > 0;
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unsigned int badness, best = -1;
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snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1;
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for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
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snd_pcm_format_t f = preferred_formats[i];
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unsigned int w;
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if (!snd_mask_test(format_mask, (__force int)f))
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continue;
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w = snd_pcm_format_width(f);
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if (w >= width)
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badness = w - width;
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else
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badness = width - w + 32;
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badness += snd_pcm_format_unsigned(f) != unsignd;
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badness += snd_pcm_format_big_endian(f) != big;
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if (badness < best) {
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best_format = f;
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best = badness;
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}
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}
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if ((__force int)best_format >= 0)
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return best_format;
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else
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return (__force snd_pcm_format_t)-EINVAL;
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} else {
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switch (format) {
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case SNDRV_PCM_FORMAT_MU_LAW:
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for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
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snd_pcm_format_t format1 = preferred_formats[i];
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if (snd_mask_test(format_mask, (__force int)format1))
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return format1;
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}
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/* fall through */
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default:
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return (__force snd_pcm_format_t)-EINVAL;
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}
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}
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}
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int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
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struct snd_pcm_hw_params *params,
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struct snd_pcm_hw_params *slave_params)
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{
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struct snd_pcm_plugin_format tmpformat;
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struct snd_pcm_plugin_format dstformat;
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struct snd_pcm_plugin_format srcformat;
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snd_pcm_access_t src_access, dst_access;
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struct snd_pcm_plugin *plugin = NULL;
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int err;
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int stream = snd_pcm_plug_stream(plug);
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int slave_interleaved = (params_channels(slave_params) == 1 ||
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params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
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switch (stream) {
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case SNDRV_PCM_STREAM_PLAYBACK:
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dstformat.format = params_format(slave_params);
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dstformat.rate = params_rate(slave_params);
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dstformat.channels = params_channels(slave_params);
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srcformat.format = params_format(params);
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srcformat.rate = params_rate(params);
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srcformat.channels = params_channels(params);
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src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
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dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
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SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
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break;
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case SNDRV_PCM_STREAM_CAPTURE:
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dstformat.format = params_format(params);
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dstformat.rate = params_rate(params);
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dstformat.channels = params_channels(params);
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srcformat.format = params_format(slave_params);
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srcformat.rate = params_rate(slave_params);
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srcformat.channels = params_channels(slave_params);
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src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
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SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
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dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
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break;
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default:
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snd_BUG();
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return -EINVAL;
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}
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tmpformat = srcformat;
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pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
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srcformat.format,
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srcformat.rate,
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srcformat.channels);
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pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
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dstformat.format,
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dstformat.rate,
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dstformat.channels);
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/* Format change (linearization) */
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if (! rate_match(srcformat.rate, dstformat.rate) &&
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! snd_pcm_format_linear(srcformat.format)) {
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if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
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return -EINVAL;
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tmpformat.format = SNDRV_PCM_FORMAT_S16;
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err = snd_pcm_plugin_build_mulaw(plug,
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&srcformat, &tmpformat,
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&plugin);
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if (err < 0)
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return err;
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err = snd_pcm_plugin_append(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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srcformat = tmpformat;
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src_access = dst_access;
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}
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/* channels reduction */
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if (srcformat.channels > dstformat.channels) {
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tmpformat.channels = dstformat.channels;
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err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
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pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
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if (err < 0)
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return err;
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err = snd_pcm_plugin_append(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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srcformat = tmpformat;
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src_access = dst_access;
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}
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|
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/* rate resampling */
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if (!rate_match(srcformat.rate, dstformat.rate)) {
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if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
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/* convert to S16 for resampling */
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tmpformat.format = SNDRV_PCM_FORMAT_S16;
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err = snd_pcm_plugin_build_linear(plug,
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&srcformat, &tmpformat,
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&plugin);
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if (err < 0)
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return err;
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err = snd_pcm_plugin_append(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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srcformat = tmpformat;
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src_access = dst_access;
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}
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tmpformat.rate = dstformat.rate;
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err = snd_pcm_plugin_build_rate(plug,
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&srcformat, &tmpformat,
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&plugin);
|
|
pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
|
|
if (err < 0)
|
|
return err;
|
|
err = snd_pcm_plugin_append(plugin);
|
|
if (err < 0) {
|
|
snd_pcm_plugin_free(plugin);
|
|
return err;
|
|
}
|
|
srcformat = tmpformat;
|
|
src_access = dst_access;
|
|
}
|
|
|
|
/* format change */
|
|
if (srcformat.format != dstformat.format) {
|
|
tmpformat.format = dstformat.format;
|
|
if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
|
|
tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
|
|
err = snd_pcm_plugin_build_mulaw(plug,
|
|
&srcformat, &tmpformat,
|
|
&plugin);
|
|
}
|
|
else if (snd_pcm_format_linear(srcformat.format) &&
|
|
snd_pcm_format_linear(tmpformat.format)) {
|
|
err = snd_pcm_plugin_build_linear(plug,
|
|
&srcformat, &tmpformat,
|
|
&plugin);
|
|
}
|
|
else
|
|
return -EINVAL;
|
|
pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
|
|
if (err < 0)
|
|
return err;
|
|
err = snd_pcm_plugin_append(plugin);
|
|
if (err < 0) {
|
|
snd_pcm_plugin_free(plugin);
|
|
return err;
|
|
}
|
|
srcformat = tmpformat;
|
|
src_access = dst_access;
|
|
}
|
|
|
|
/* channels extension */
|
|
if (srcformat.channels < dstformat.channels) {
|
|
tmpformat.channels = dstformat.channels;
|
|
err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
|
|
pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
|
|
if (err < 0)
|
|
return err;
|
|
err = snd_pcm_plugin_append(plugin);
|
|
if (err < 0) {
|
|
snd_pcm_plugin_free(plugin);
|
|
return err;
|
|
}
|
|
srcformat = tmpformat;
|
|
src_access = dst_access;
|
|
}
|
|
|
|
/* de-interleave */
|
|
if (src_access != dst_access) {
|
|
err = snd_pcm_plugin_build_copy(plug,
|
|
&srcformat,
|
|
&tmpformat,
|
|
&plugin);
|
|
pdprintf("interleave change (copy: returns %i)\n", err);
|
|
if (err < 0)
|
|
return err;
|
|
err = snd_pcm_plugin_append(plugin);
|
|
if (err < 0) {
|
|
snd_pcm_plugin_free(plugin);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
|
|
char *buf,
|
|
snd_pcm_uframes_t count,
|
|
struct snd_pcm_plugin_channel **channels)
|
|
{
|
|
struct snd_pcm_plugin *plugin;
|
|
struct snd_pcm_plugin_channel *v;
|
|
struct snd_pcm_plugin_format *format;
|
|
int width, nchannels, channel;
|
|
int stream = snd_pcm_plug_stream(plug);
|
|
|
|
if (snd_BUG_ON(!buf))
|
|
return -ENXIO;
|
|
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
|
|
plugin = snd_pcm_plug_first(plug);
|
|
format = &plugin->src_format;
|
|
} else {
|
|
plugin = snd_pcm_plug_last(plug);
|
|
format = &plugin->dst_format;
|
|
}
|
|
v = plugin->buf_channels;
|
|
*channels = v;
|
|
if ((width = snd_pcm_format_physical_width(format->format)) < 0)
|
|
return width;
|
|
nchannels = format->channels;
|
|
if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
|
|
format->channels > 1))
|
|
return -ENXIO;
|
|
for (channel = 0; channel < nchannels; channel++, v++) {
|
|
v->frames = count;
|
|
v->enabled = 1;
|
|
v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
|
|
v->area.addr = buf;
|
|
v->area.first = channel * width;
|
|
v->area.step = nchannels * width;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
snd_pcm_sframes_t snd_pcm_plug_write_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *src_channels, snd_pcm_uframes_t size)
|
|
{
|
|
struct snd_pcm_plugin *plugin, *next;
|
|
struct snd_pcm_plugin_channel *dst_channels;
|
|
int err;
|
|
snd_pcm_sframes_t frames = size;
|
|
|
|
plugin = snd_pcm_plug_first(plug);
|
|
while (plugin) {
|
|
if (frames <= 0)
|
|
return frames;
|
|
if ((next = plugin->next) != NULL) {
|
|
snd_pcm_sframes_t frames1 = frames;
|
|
if (plugin->dst_frames) {
|
|
frames1 = plugin->dst_frames(plugin, frames);
|
|
if (frames1 <= 0)
|
|
return frames1;
|
|
}
|
|
if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
|
|
return err;
|
|
}
|
|
if (err != frames1) {
|
|
frames = err;
|
|
if (plugin->src_frames) {
|
|
frames = plugin->src_frames(plugin, frames1);
|
|
if (frames <= 0)
|
|
return frames;
|
|
}
|
|
}
|
|
} else
|
|
dst_channels = NULL;
|
|
pdprintf("write plugin: %s, %li\n", plugin->name, frames);
|
|
if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
|
|
return frames;
|
|
src_channels = dst_channels;
|
|
plugin = next;
|
|
}
|
|
return snd_pcm_plug_client_size(plug, frames);
|
|
}
|
|
|
|
snd_pcm_sframes_t snd_pcm_plug_read_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *dst_channels_final, snd_pcm_uframes_t size)
|
|
{
|
|
struct snd_pcm_plugin *plugin, *next;
|
|
struct snd_pcm_plugin_channel *src_channels, *dst_channels;
|
|
snd_pcm_sframes_t frames = size;
|
|
int err;
|
|
|
|
frames = snd_pcm_plug_slave_size(plug, frames);
|
|
if (frames < 0)
|
|
return frames;
|
|
|
|
src_channels = NULL;
|
|
plugin = snd_pcm_plug_first(plug);
|
|
while (plugin && frames > 0) {
|
|
if ((next = plugin->next) != NULL) {
|
|
if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
|
|
return err;
|
|
}
|
|
frames = err;
|
|
} else {
|
|
dst_channels = dst_channels_final;
|
|
}
|
|
pdprintf("read plugin: %s, %li\n", plugin->name, frames);
|
|
if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
|
|
return frames;
|
|
plugin = next;
|
|
src_channels = dst_channels;
|
|
}
|
|
return frames;
|
|
}
|
|
|
|
int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
|
|
size_t samples, snd_pcm_format_t format)
|
|
{
|
|
/* FIXME: sub byte resolution and odd dst_offset */
|
|
unsigned char *dst;
|
|
unsigned int dst_step;
|
|
int width;
|
|
const unsigned char *silence;
|
|
if (!dst_area->addr)
|
|
return 0;
|
|
dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
|
|
width = snd_pcm_format_physical_width(format);
|
|
if (width <= 0)
|
|
return -EINVAL;
|
|
if (dst_area->step == (unsigned int) width && width >= 8)
|
|
return snd_pcm_format_set_silence(format, dst, samples);
|
|
silence = snd_pcm_format_silence_64(format);
|
|
if (! silence)
|
|
return -EINVAL;
|
|
dst_step = dst_area->step / 8;
|
|
if (width == 4) {
|
|
/* Ima ADPCM */
|
|
int dstbit = dst_area->first % 8;
|
|
int dstbit_step = dst_area->step % 8;
|
|
while (samples-- > 0) {
|
|
if (dstbit)
|
|
*dst &= 0xf0;
|
|
else
|
|
*dst &= 0x0f;
|
|
dst += dst_step;
|
|
dstbit += dstbit_step;
|
|
if (dstbit == 8) {
|
|
dst++;
|
|
dstbit = 0;
|
|
}
|
|
}
|
|
} else {
|
|
width /= 8;
|
|
while (samples-- > 0) {
|
|
memcpy(dst, silence, width);
|
|
dst += dst_step;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
|
|
const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
|
|
size_t samples, snd_pcm_format_t format)
|
|
{
|
|
/* FIXME: sub byte resolution and odd dst_offset */
|
|
char *src, *dst;
|
|
int width;
|
|
int src_step, dst_step;
|
|
src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
|
|
if (!src_area->addr)
|
|
return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
|
|
dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
|
|
if (!dst_area->addr)
|
|
return 0;
|
|
width = snd_pcm_format_physical_width(format);
|
|
if (width <= 0)
|
|
return -EINVAL;
|
|
if (src_area->step == (unsigned int) width &&
|
|
dst_area->step == (unsigned int) width && width >= 8) {
|
|
size_t bytes = samples * width / 8;
|
|
memcpy(dst, src, bytes);
|
|
return 0;
|
|
}
|
|
src_step = src_area->step / 8;
|
|
dst_step = dst_area->step / 8;
|
|
if (width == 4) {
|
|
/* Ima ADPCM */
|
|
int srcbit = src_area->first % 8;
|
|
int srcbit_step = src_area->step % 8;
|
|
int dstbit = dst_area->first % 8;
|
|
int dstbit_step = dst_area->step % 8;
|
|
while (samples-- > 0) {
|
|
unsigned char srcval;
|
|
if (srcbit)
|
|
srcval = *src & 0x0f;
|
|
else
|
|
srcval = (*src & 0xf0) >> 4;
|
|
if (dstbit)
|
|
*dst = (*dst & 0xf0) | srcval;
|
|
else
|
|
*dst = (*dst & 0x0f) | (srcval << 4);
|
|
src += src_step;
|
|
srcbit += srcbit_step;
|
|
if (srcbit == 8) {
|
|
src++;
|
|
srcbit = 0;
|
|
}
|
|
dst += dst_step;
|
|
dstbit += dstbit_step;
|
|
if (dstbit == 8) {
|
|
dst++;
|
|
dstbit = 0;
|
|
}
|
|
}
|
|
} else {
|
|
width /= 8;
|
|
while (samples-- > 0) {
|
|
memcpy(dst, src, width);
|
|
src += src_step;
|
|
dst += dst_step;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|