X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=oss_mix.c;h=7fbdba5b770923988e646b96e74582f8ff4e8a1f;hp=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391;hb=8d106ca317a2c42f35a86ba244f843688f6939e6;hpb=7024574d05fe8571c763d11c61626a9ac4980267

diff --git a/oss_mix.c b/oss_mix.c
index e69de29b..7fbdba5b 100644
--- a/oss_mix.c
+++ b/oss_mix.c
@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 1998 Andre Noll <maan@tuebingen.mpg.de>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+
+/** \file oss_mix.c The OSS mixer plugin. */
+
+#include <sys/soundcard.h>
+#include <sys/ioctl.h>
+#include <regex.h>
+
+#include "para.h"
+#include "error.h"
+#include "mix.h"
+#include "fd.h"
+#include "string.h"
+
+struct oss_mixer_channel {
+	const char *name;
+	int id;
+};
+
+static const struct oss_mixer_channel channels[] = {
+	{.name = "volume", .id = SOUND_MIXER_VOLUME},
+	{.name = "bass", .id = SOUND_MIXER_BASS},
+	{.name = "treble", .id = SOUND_MIXER_TREBLE},
+	{.name = "synth", .id = SOUND_MIXER_SYNTH},
+	{.name = "pcm", .id = SOUND_MIXER_PCM},
+	{.name = "speaker", .id = SOUND_MIXER_SPEAKER},
+	{.name = "line", .id = SOUND_MIXER_LINE},
+	{.name = "mic", .id = SOUND_MIXER_MIC},
+	{.name = "cd", .id = SOUND_MIXER_CD},
+	{.name = "imix", .id = SOUND_MIXER_IMIX},
+	{.name = "altpcm", .id = SOUND_MIXER_ALTPCM},
+	{.name = "reclev", .id = SOUND_MIXER_RECLEV},
+	{.name = "igain", .id = SOUND_MIXER_IGAIN},
+	{.name = "ogain", .id = SOUND_MIXER_OGAIN},
+};
+
+/** Iterate over all defined mixer channels. */
+#define FOR_EACH_CHANNEL(i) for ((i) = 0; (i) < ARRAY_SIZE(channels); (i)++)
+
+struct mixer_handle {
+	int fd;
+	int id;
+};
+
+static int oss_mix_open(const char *dev, struct mixer_handle **handle)
+{
+	int ret;
+	struct mixer_handle *h;
+
+	*handle = NULL;
+	if (!dev)
+		dev = "/dev/mixer";
+	PARA_INFO_LOG("opening %s\n", dev);
+	ret = para_open(dev, O_RDWR, 42);
+	if (ret < 0) {
+		PARA_ERROR_LOG("could not open %s\n", dev);
+		return ret;
+	}
+	h = para_malloc(sizeof(*h));
+	h->fd = ret;
+	*handle = h;
+	return 1;
+}
+
+static char *oss_mix_get_channels(__a_unused struct mixer_handle *handle)
+{
+	int i;
+	char *list = NULL;
+
+	FOR_EACH_CHANNEL(i) {
+		const char *name = channels[i].name;
+		char *tmp = list;
+		list = make_message("%s%s%s",
+			list? list : "",
+			list? ", " : "",
+			name);
+		free(tmp);
+	}
+	return list;
+}
+
+static int oss_mix_set_channel(struct mixer_handle *handle,
+		const char *mixer_channel)
+{
+	int i;
+
+	if (!mixer_channel) {
+		handle->id = SOUND_MIXER_VOLUME; /* default */
+		return 0;
+	}
+	FOR_EACH_CHANNEL(i) {
+		if (strcasecmp(channels[i].name, mixer_channel))
+			continue;
+		handle->id = i;
+		return 1;
+	}
+	return -E_BAD_CHANNEL;
+}
+
+static int oss_mix_get(struct mixer_handle *handle)
+{
+	int val, fd = handle->fd, id = handle->id;
+
+	if (ioctl(fd, MIXER_READ(id), &val) < 0)
+		return -ERRNO_TO_PARA_ERROR(errno);
+	/* take the mean value of left and right */
+	return (val % 256 + (val >> 8)) / 2;
+}
+
+static int oss_mix_set(struct mixer_handle *handle, int val)
+{
+	int fd = handle->fd, id = handle->id, tmp = (val << 8) + val;
+
+	if (ioctl(fd, MIXER_WRITE(id), &tmp) < 0)
+		return -ERRNO_TO_PARA_ERROR(errno);
+	return 1;
+}
+
+static void oss_mix_close(struct mixer_handle **handle)
+{
+	struct mixer_handle *h;
+
+	if (!handle)
+		return;
+	h = *handle;
+	if (h) {
+		if (h->fd >= 0)
+			close(h->fd);
+		free(h);
+	}
+	*handle = NULL;
+}
+
+/** The mixer operations for the OSS mixer. */
+const struct mixer oss_mixer = {
+	.name = "oss",
+	.open = oss_mix_open,
+	.get_channels = oss_mix_get_channels,
+	.set_channel = oss_mix_set_channel,
+	.close = oss_mix_close,
+	.get = oss_mix_get,
+	.set = oss_mix_set
+};