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65ff3a8d0b
Add an SPDX id of LGPL-2.0+ to files in the sound core sub-system that are missing ids. Remove boilerplate text. These files were originally submitted in a big commit for the ALSA sound system for kernel version 2.5.4, by Jaroslav Kysela, in Feb 2002. Signed-off-by: Tim Bird <tim.bird@sony.com> Link: https://patch.msgid.link/20260212183103.3720788-1-tim.bird@sony.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
// SPDX-License-Identifier: LGPL-2.0+
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/*
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* Route Plug-In
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* Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
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*/
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#include <linux/time.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include "pcm_plugin.h"
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static void zero_areas(struct snd_pcm_plugin_channel *dvp, int ndsts,
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snd_pcm_uframes_t frames, snd_pcm_format_t format)
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{
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int dst = 0;
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for (; dst < ndsts; ++dst) {
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if (dvp->wanted)
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snd_pcm_area_silence(&dvp->area, 0, frames, format);
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dvp->enabled = 0;
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dvp++;
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}
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}
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static inline void copy_area(const struct snd_pcm_plugin_channel *src_channel,
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struct snd_pcm_plugin_channel *dst_channel,
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snd_pcm_uframes_t frames, snd_pcm_format_t format)
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{
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dst_channel->enabled = 1;
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snd_pcm_area_copy(&src_channel->area, 0, &dst_channel->area, 0, frames, format);
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}
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static snd_pcm_sframes_t route_transfer(struct snd_pcm_plugin *plugin,
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const struct snd_pcm_plugin_channel *src_channels,
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struct snd_pcm_plugin_channel *dst_channels,
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snd_pcm_uframes_t frames)
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{
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int nsrcs, ndsts, dst;
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struct snd_pcm_plugin_channel *dvp;
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snd_pcm_format_t format;
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if (snd_BUG_ON(!plugin || !src_channels || !dst_channels))
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return -ENXIO;
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if (frames == 0)
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return 0;
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if (frames > dst_channels[0].frames)
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frames = dst_channels[0].frames;
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nsrcs = plugin->src_format.channels;
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ndsts = plugin->dst_format.channels;
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format = plugin->dst_format.format;
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dvp = dst_channels;
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if (nsrcs <= 1) {
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/* expand to all channels */
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for (dst = 0; dst < ndsts; ++dst) {
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copy_area(src_channels, dvp, frames, format);
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dvp++;
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}
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return frames;
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}
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for (dst = 0; dst < ndsts && dst < nsrcs; ++dst) {
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copy_area(src_channels, dvp, frames, format);
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dvp++;
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src_channels++;
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}
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if (dst < ndsts)
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zero_areas(dvp, ndsts - dst, frames, format);
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return frames;
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}
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int snd_pcm_plugin_build_route(struct snd_pcm_substream *plug,
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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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struct snd_pcm_plugin **r_plugin)
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{
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struct snd_pcm_plugin *plugin;
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int err;
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if (snd_BUG_ON(!r_plugin))
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return -ENXIO;
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*r_plugin = NULL;
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if (snd_BUG_ON(src_format->rate != dst_format->rate))
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return -ENXIO;
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if (snd_BUG_ON(src_format->format != dst_format->format))
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return -ENXIO;
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err = snd_pcm_plugin_build(plug, "route conversion",
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src_format, dst_format, 0, &plugin);
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if (err < 0)
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return err;
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plugin->transfer = route_transfer;
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*r_plugin = plugin;
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return 0;
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}
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