Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

sound/core/oss/linear.c

@@ -0,0 +1,158 @@
+/*
+ *  Linear conversion Plug-In
+ *  Copyright (c) 1999 by Jaroslav Kysela <perex@suse.cz>,
+ *			  Abramo Bagnara <abramo@alsa-project.org>
+ *
+ *
+ *   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 <sound/driver.h>
+#include <linux/time.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include "pcm_plugin.h"
+
+/*
+ *  Basic linear conversion plugin
+ */
+ 
+typedef struct linear_private_data {
+	int conv;
+} linear_t;
+
+static void convert(snd_pcm_plugin_t *plugin,
+		    const snd_pcm_plugin_channel_t *src_channels,
+		    snd_pcm_plugin_channel_t *dst_channels,
+		    snd_pcm_uframes_t frames)
+{
+#define CONV_LABELS
+#include "plugin_ops.h"
+#undef CONV_LABELS
+	linear_t *data = (linear_t *)plugin->extra_data;
+	void *conv = conv_labels[data->conv];
+	int channel;
+	int nchannels = plugin->src_format.channels;
+	for (channel = 0; channel < nchannels; ++channel) {
+		char *src;
+		char *dst;
+		int src_step, dst_step;
+		snd_pcm_uframes_t frames1;
+		if (!src_channels[channel].enabled) {
+			if (dst_channels[channel].wanted)
+				snd_pcm_area_silence(&dst_channels[channel].area, 0, frames, plugin->dst_format.format);
+			dst_channels[channel].enabled = 0;
+			continue;
+		}
+		dst_channels[channel].enabled = 1;
+		src = src_channels[channel].area.addr + src_channels[channel].area.first / 8;
+		dst = dst_channels[channel].area.addr + dst_channels[channel].area.first / 8;
+		src_step = src_channels[channel].area.step / 8;
+		dst_step = dst_channels[channel].area.step / 8;
+		frames1 = frames;
+		while (frames1-- > 0) {
+			goto *conv;
+#define CONV_END after
+#include "plugin_ops.h"
+#undef CONV_END
+		after:
+			src += src_step;
+			dst += dst_step;
+		}
+	}
+}
+
+static snd_pcm_sframes_t linear_transfer(snd_pcm_plugin_t *plugin,
+			       const snd_pcm_plugin_channel_t *src_channels,
+			       snd_pcm_plugin_channel_t *dst_channels,
+			       snd_pcm_uframes_t frames)
+{
+	linear_t *data;
+
+	snd_assert(plugin != NULL && src_channels != NULL && dst_channels != NULL, return -ENXIO);
+	data = (linear_t *)plugin->extra_data;
+	if (frames == 0)
+		return 0;
+#ifdef CONFIG_SND_DEBUG
+	{
+		unsigned int channel;
+		for (channel = 0; channel < plugin->src_format.channels; channel++) {
+			snd_assert(src_channels[channel].area.first % 8 == 0 &&
+				   src_channels[channel].area.step % 8 == 0,
+				   return -ENXIO);
+			snd_assert(dst_channels[channel].area.first % 8 == 0 &&
+				   dst_channels[channel].area.step % 8 == 0,
+				   return -ENXIO);
+		}
+	}
+#endif
+	convert(plugin, src_channels, dst_channels, frames);
+	return frames;
+}
+
+int conv_index(int src_format, int dst_format)
+{
+	int src_endian, dst_endian, sign, src_width, dst_width;
+
+	sign = (snd_pcm_format_signed(src_format) !=
+		snd_pcm_format_signed(dst_format));
+#ifdef SNDRV_LITTLE_ENDIAN
+	src_endian = snd_pcm_format_big_endian(src_format);
+	dst_endian = snd_pcm_format_big_endian(dst_format);
+#else
+	src_endian = snd_pcm_format_little_endian(src_format);
+	dst_endian = snd_pcm_format_little_endian(dst_format);
+#endif
+
+	if (src_endian < 0)
+		src_endian = 0;
+	if (dst_endian < 0)
+		dst_endian = 0;
+
+	src_width = snd_pcm_format_width(src_format) / 8 - 1;
+	dst_width = snd_pcm_format_width(dst_format) / 8 - 1;
+
+	return src_width * 32 + src_endian * 16 + sign * 8 + dst_width * 2 + dst_endian;
+}
+
+int snd_pcm_plugin_build_linear(snd_pcm_plug_t *plug,
+				snd_pcm_plugin_format_t *src_format,
+				snd_pcm_plugin_format_t *dst_format,
+				snd_pcm_plugin_t **r_plugin)
+{
+	int err;
+	struct linear_private_data *data;
+	snd_pcm_plugin_t *plugin;
+
+	snd_assert(r_plugin != NULL, return -ENXIO);
+	*r_plugin = NULL;
+
+	snd_assert(src_format->rate == dst_format->rate, return -ENXIO);
+	snd_assert(src_format->channels == dst_format->channels, return -ENXIO);
+	snd_assert(snd_pcm_format_linear(src_format->format) &&
+		   snd_pcm_format_linear(dst_format->format), return -ENXIO);
+
+	err = snd_pcm_plugin_build(plug, "linear format conversion",
+				   src_format, dst_format,
+				   sizeof(linear_t), &plugin);
+	if (err < 0)
+		return err;
+	data = (linear_t *)plugin->extra_data;
+	data->conv = conv_index(src_format->format, dst_format->format);
+	plugin->transfer = linear_transfer;
+	*r_plugin = plugin;
+	return 0;
+}