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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /sound/core/oss/io.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sound/core/oss/io.c')
-rw-r--r--sound/core/oss/io.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/sound/core/oss/io.c b/sound/core/oss/io.c
new file mode 100644
index 0000000000..d870b2d931
--- /dev/null
+++ b/sound/core/oss/io.c
@@ -0,0 +1,141 @@
+/*
+ * PCM I/O Plug-In Interface
+ * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/time.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include "pcm_plugin.h"
+
+#define pcm_write(plug,buf,count) snd_pcm_oss_write3(plug,buf,count,1)
+#define pcm_writev(plug,vec,count) snd_pcm_oss_writev3(plug,vec,count)
+#define pcm_read(plug,buf,count) snd_pcm_oss_read3(plug,buf,count,1)
+#define pcm_readv(plug,vec,count) snd_pcm_oss_readv3(plug,vec,count)
+
+/*
+ * Basic io plugin
+ */
+
+static snd_pcm_sframes_t io_playback_transfer(struct snd_pcm_plugin *plugin,
+ const struct snd_pcm_plugin_channel *src_channels,
+ struct snd_pcm_plugin_channel *dst_channels,
+ snd_pcm_uframes_t frames)
+{
+ if (snd_BUG_ON(!plugin))
+ return -ENXIO;
+ if (snd_BUG_ON(!src_channels))
+ return -ENXIO;
+ if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
+ return pcm_write(plugin->plug, src_channels->area.addr, frames);
+ } else {
+ int channel, channels = plugin->dst_format.channels;
+ void **bufs = (void**)plugin->extra_data;
+ if (snd_BUG_ON(!bufs))
+ return -ENXIO;
+ for (channel = 0; channel < channels; channel++) {
+ if (src_channels[channel].enabled)
+ bufs[channel] = src_channels[channel].area.addr;
+ else
+ bufs[channel] = NULL;
+ }
+ return pcm_writev(plugin->plug, bufs, frames);
+ }
+}
+
+static snd_pcm_sframes_t io_capture_transfer(struct snd_pcm_plugin *plugin,
+ const struct snd_pcm_plugin_channel *src_channels,
+ struct snd_pcm_plugin_channel *dst_channels,
+ snd_pcm_uframes_t frames)
+{
+ if (snd_BUG_ON(!plugin))
+ return -ENXIO;
+ if (snd_BUG_ON(!dst_channels))
+ return -ENXIO;
+ if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
+ return pcm_read(plugin->plug, dst_channels->area.addr, frames);
+ } else {
+ int channel, channels = plugin->dst_format.channels;
+ void **bufs = (void**)plugin->extra_data;
+ if (snd_BUG_ON(!bufs))
+ return -ENXIO;
+ for (channel = 0; channel < channels; channel++) {
+ if (dst_channels[channel].enabled)
+ bufs[channel] = dst_channels[channel].area.addr;
+ else
+ bufs[channel] = NULL;
+ }
+ return pcm_readv(plugin->plug, bufs, frames);
+ }
+ return 0;
+}
+
+static snd_pcm_sframes_t io_src_channels(struct snd_pcm_plugin *plugin,
+ snd_pcm_uframes_t frames,
+ struct snd_pcm_plugin_channel **channels)
+{
+ int err;
+ unsigned int channel;
+ struct snd_pcm_plugin_channel *v;
+ err = snd_pcm_plugin_client_channels(plugin, frames, &v);
+ if (err < 0)
+ return err;
+ *channels = v;
+ if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
+ for (channel = 0; channel < plugin->src_format.channels; ++channel, ++v)
+ v->wanted = 1;
+ }
+ return frames;
+}
+
+int snd_pcm_plugin_build_io(struct snd_pcm_substream *plug,
+ struct snd_pcm_hw_params *params,
+ struct snd_pcm_plugin **r_plugin)
+{
+ int err;
+ struct snd_pcm_plugin_format format;
+ struct snd_pcm_plugin *plugin;
+
+ if (snd_BUG_ON(!r_plugin))
+ return -ENXIO;
+ *r_plugin = NULL;
+ if (snd_BUG_ON(!plug || !params))
+ return -ENXIO;
+ format.format = params_format(params);
+ format.rate = params_rate(params);
+ format.channels = params_channels(params);
+ err = snd_pcm_plugin_build(plug, "I/O io",
+ &format, &format,
+ sizeof(void *) * format.channels,
+ &plugin);
+ if (err < 0)
+ return err;
+ plugin->access = params_access(params);
+ if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
+ plugin->transfer = io_playback_transfer;
+ if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
+ plugin->client_channels = io_src_channels;
+ } else {
+ plugin->transfer = io_capture_transfer;
+ }
+
+ *r_plugin = plugin;
+ return 0;
+}