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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>
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
// SPDX-License-Identifier: LGPL-2.0+
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/*
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* Linear conversion 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 snd_pcm_sframes_t copy_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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unsigned int channel;
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unsigned int nchannels;
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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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nchannels = plugin->src_format.channels;
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for (channel = 0; channel < nchannels; channel++) {
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if (snd_BUG_ON(src_channels->area.first % 8 ||
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src_channels->area.step % 8))
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return -ENXIO;
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if (snd_BUG_ON(dst_channels->area.first % 8 ||
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dst_channels->area.step % 8))
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return -ENXIO;
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if (!src_channels->enabled) {
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if (dst_channels->wanted)
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snd_pcm_area_silence(&dst_channels->area, 0, frames, plugin->dst_format.format);
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dst_channels->enabled = 0;
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continue;
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}
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dst_channels->enabled = 1;
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snd_pcm_area_copy(&src_channels->area, 0, &dst_channels->area, 0, frames, plugin->src_format.format);
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src_channels++;
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dst_channels++;
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}
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return frames;
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}
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int snd_pcm_plugin_build_copy(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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int err;
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struct snd_pcm_plugin *plugin;
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int width;
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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->format != dst_format->format))
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return -ENXIO;
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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->channels != dst_format->channels))
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return -ENXIO;
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width = snd_pcm_format_physical_width(src_format->format);
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if (snd_BUG_ON(width <= 0))
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return -ENXIO;
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err = snd_pcm_plugin_build(plug, "copy", src_format, dst_format,
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0, &plugin);
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if (err < 0)
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return err;
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plugin->transfer = copy_transfer;
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*r_plugin = plugin;
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return 0;
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}
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