181 lines
4.1 KiB
C++
181 lines
4.1 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "mixer/MixerInternal.hxx"
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#include "config/Block.hxx"
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#include "system/fd_util.h"
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#include "system/Error.hxx"
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#include "util/ASCII.hxx"
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#include "util/Domain.hxx"
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#include "util/RuntimeError.hxx"
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#include "Log.hxx"
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#include <assert.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#if defined(__OpenBSD__) || defined(__NetBSD__)
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# include <soundcard.h>
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#else /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
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# include <sys/soundcard.h>
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#endif /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
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#define VOLUME_MIXER_OSS_DEFAULT "/dev/mixer"
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class OssMixer final : public Mixer {
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const char *device;
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const char *control;
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int device_fd;
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int volume_control;
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public:
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OssMixer(MixerListener &_listener, const ConfigBlock &block)
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:Mixer(oss_mixer_plugin, _listener) {
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Configure(block);
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}
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void Configure(const ConfigBlock &block);
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/* virtual methods from class Mixer */
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void Open() override;
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void Close() override;
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int GetVolume() override;
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void SetVolume(unsigned volume) override;
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};
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static constexpr Domain oss_mixer_domain("oss_mixer");
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static int
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oss_find_mixer(const char *name)
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{
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const char *labels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_LABELS;
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size_t name_length = strlen(name);
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for (unsigned i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
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if (StringEqualsCaseASCII(name, labels[i], name_length) &&
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(labels[i][name_length] == 0 ||
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labels[i][name_length] == ' '))
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return i;
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}
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return -1;
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}
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inline void
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OssMixer::Configure(const ConfigBlock &block)
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{
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device = block.GetBlockValue("mixer_device", VOLUME_MIXER_OSS_DEFAULT);
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control = block.GetBlockValue("mixer_control");
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if (control != NULL) {
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volume_control = oss_find_mixer(control);
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if (volume_control < 0)
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throw FormatRuntimeError("no such mixer control: %s",
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control);
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} else
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volume_control = SOUND_MIXER_PCM;
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}
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static Mixer *
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oss_mixer_init(gcc_unused EventLoop &event_loop, gcc_unused AudioOutput &ao,
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MixerListener &listener,
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const ConfigBlock &block)
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{
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return new OssMixer(listener, block);
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}
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void
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OssMixer::Close()
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{
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assert(device_fd >= 0);
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close(device_fd);
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}
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void
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OssMixer::Open()
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{
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device_fd = open_cloexec(device, O_RDONLY, 0);
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if (device_fd < 0)
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throw FormatErrno("failed to open %s", device);
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try {
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if (control) {
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int devmask = 0;
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if (ioctl(device_fd, SOUND_MIXER_READ_DEVMASK, &devmask) < 0)
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throw MakeErrno("READ_DEVMASK failed");
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if (((1 << volume_control) & devmask) == 0)
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throw FormatErrno("mixer control \"%s\" not usable",
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control);
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}
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} catch (...) {
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Close();
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throw;
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}
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}
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int
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OssMixer::GetVolume()
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{
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int left, right, level;
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int ret;
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assert(device_fd >= 0);
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ret = ioctl(device_fd, MIXER_READ(volume_control), &level);
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if (ret < 0)
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throw MakeErrno("failed to read OSS volume");
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left = level & 0xff;
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right = (level & 0xff00) >> 8;
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if (left != right) {
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FormatWarning(oss_mixer_domain,
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"volume for left and right is not the same, \"%i\" and "
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"\"%i\"\n", left, right);
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}
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return left;
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}
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void
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OssMixer::SetVolume(unsigned volume)
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{
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int level;
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assert(device_fd >= 0);
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assert(volume <= 100);
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level = (volume << 8) + volume;
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if (ioctl(device_fd, MIXER_WRITE(volume_control), &level) < 0)
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throw MakeErrno("failed to set OSS volume");
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}
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const MixerPlugin oss_mixer_plugin = {
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oss_mixer_init,
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true,
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};
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