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Diffstat (limited to 'src/mixer/plugins/OssMixerPlugin.cxx')
| -rw-r--r-- | src/mixer/plugins/OssMixerPlugin.cxx | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/src/mixer/plugins/OssMixerPlugin.cxx b/src/mixer/plugins/OssMixerPlugin.cxx new file mode 100644 index 000000000..6615c7022 --- /dev/null +++ b/src/mixer/plugins/OssMixerPlugin.cxx @@ -0,0 +1,203 @@ +/* + * 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 ¶m, 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 ¶m, 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 ¶m, + 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, +}; |