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-rw-r--r--src/mixer/plugins/OssMixerPlugin.cxx203
1 files changed, 203 insertions, 0 deletions
diff --git a/src/mixer/plugins/OssMixerPlugin.cxx b/src/mixer/plugins/OssMixerPlugin.cxx
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+++ b/src/mixer/plugins/OssMixerPlugin.cxx
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+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "mixer/MixerInternal.hxx"
+#include "config/ConfigData.hxx"
+#include "system/fd_util.h"
+#include "util/ASCII.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
+
+#include <assert.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#if defined(__OpenBSD__) || defined(__NetBSD__)
+# include <soundcard.h>
+#else /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
+# include <sys/soundcard.h>
+#endif /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
+
+#define VOLUME_MIXER_OSS_DEFAULT "/dev/mixer"
+
+class OssMixer final : public Mixer {
+ const char *device;
+ const char *control;
+
+ int device_fd;
+ int volume_control;
+
+public:
+ OssMixer(MixerListener &_listener)
+ :Mixer(oss_mixer_plugin, _listener) {}
+
+ bool Configure(const config_param &param, Error &error);
+
+ /* virtual methods from class Mixer */
+ virtual bool Open(Error &error) override;
+ virtual void Close() override;
+ virtual int GetVolume(Error &error) override;
+ virtual bool SetVolume(unsigned volume, Error &error) override;
+};
+
+static constexpr Domain oss_mixer_domain("oss_mixer");
+
+static int
+oss_find_mixer(const char *name)
+{
+ const char *labels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_LABELS;
+ size_t name_length = strlen(name);
+
+ for (unsigned i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
+ if (StringEqualsCaseASCII(name, labels[i], name_length) &&
+ (labels[i][name_length] == 0 ||
+ labels[i][name_length] == ' '))
+ return i;
+ }
+ return -1;
+}
+
+inline bool
+OssMixer::Configure(const config_param &param, Error &error)
+{
+ device = param.GetBlockValue("mixer_device", VOLUME_MIXER_OSS_DEFAULT);
+ control = param.GetBlockValue("mixer_control");
+
+ if (control != NULL) {
+ volume_control = oss_find_mixer(control);
+ if (volume_control < 0) {
+ error.Format(oss_mixer_domain, 0,
+ "no such mixer control: %s", control);
+ return false;
+ }
+ } else
+ volume_control = SOUND_MIXER_PCM;
+
+ return true;
+}
+
+static Mixer *
+oss_mixer_init(gcc_unused EventLoop &event_loop, gcc_unused AudioOutput &ao,
+ MixerListener &listener,
+ const config_param &param,
+ Error &error)
+{
+ OssMixer *om = new OssMixer(listener);
+
+ if (!om->Configure(param, error)) {
+ delete om;
+ return nullptr;
+ }
+
+ return om;
+}
+
+void
+OssMixer::Close()
+{
+ assert(device_fd >= 0);
+
+ close(device_fd);
+}
+
+bool
+OssMixer::Open(Error &error)
+{
+ device_fd = open_cloexec(device, O_RDONLY, 0);
+ if (device_fd < 0) {
+ error.FormatErrno("failed to open %s", device);
+ return false;
+ }
+
+ if (control) {
+ int devmask = 0;
+
+ if (ioctl(device_fd, SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
+ error.SetErrno("READ_DEVMASK failed");
+ Close();
+ return false;
+ }
+
+ if (((1 << volume_control) & devmask) == 0) {
+ error.Format(oss_mixer_domain, 0,
+ "mixer control \"%s\" not usable",
+ control);
+ Close();
+ return false;
+ }
+ }
+
+ return true;
+}
+
+int
+OssMixer::GetVolume(Error &error)
+{
+ int left, right, level;
+ int ret;
+
+ assert(device_fd >= 0);
+
+ ret = ioctl(device_fd, MIXER_READ(volume_control), &level);
+ if (ret < 0) {
+ error.SetErrno("failed to read OSS volume");
+ return false;
+ }
+
+ left = level & 0xff;
+ right = (level & 0xff00) >> 8;
+
+ if (left != right) {
+ FormatWarning(oss_mixer_domain,
+ "volume for left and right is not the same, \"%i\" and "
+ "\"%i\"\n", left, right);
+ }
+
+ return left;
+}
+
+bool
+OssMixer::SetVolume(unsigned volume, Error &error)
+{
+ int level;
+ int ret;
+
+ assert(device_fd >= 0);
+ assert(volume <= 100);
+
+ level = (volume << 8) + volume;
+
+ ret = ioctl(device_fd, MIXER_WRITE(volume_control), &level);
+ if (ret < 0) {
+ error.SetErrno("failed to set OSS volume");
+ return false;
+ }
+
+ return true;
+}
+
+const MixerPlugin oss_mixer_plugin = {
+ oss_mixer_init,
+ true,
+};