diff options
Diffstat (limited to 'src/mixer/OssMixerPlugin.cxx')
| -rw-r--r-- | src/mixer/OssMixerPlugin.cxx | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/src/mixer/OssMixerPlugin.cxx b/src/mixer/OssMixerPlugin.cxx new file mode 100644 index 00000000..490a6541 --- /dev/null +++ b/src/mixer/OssMixerPlugin.cxx @@ -0,0 +1,216 @@ +/* + * Copyright (C) 2003-2013 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_api.h" +#include "output_api.h" +#include "fd_util.h" + +#include <glib.h> + +#include <assert.h> +#include <sys/stat.h> +#include <sys/ioctl.h> +#include <fcntl.h> +#include <errno.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" + +struct oss_mixer { + /** the base mixer class */ + struct mixer base; + + const char *device; + const char *control; + + int device_fd; + int volume_control; +}; + +/** + * The quark used for GError.domain. + */ +static inline GQuark +oss_mixer_quark(void) +{ + return g_quark_from_static_string("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 (g_ascii_strncasecmp(name, labels[i], name_length) == 0 && + (labels[i][name_length] == 0 || + labels[i][name_length] == ' ')) + return i; + } + return -1; +} + +static struct mixer * +oss_mixer_init(G_GNUC_UNUSED void *ao, const struct config_param *param, + GError **error_r) +{ + struct oss_mixer *om = g_new(struct oss_mixer, 1); + + mixer_init(&om->base, &oss_mixer_plugin); + + om->device = config_get_block_string(param, "mixer_device", + VOLUME_MIXER_OSS_DEFAULT); + om->control = config_get_block_string(param, "mixer_control", NULL); + + if (om->control != NULL) { + om->volume_control = oss_find_mixer(om->control); + if (om->volume_control < 0) { + g_free(om); + g_set_error(error_r, oss_mixer_quark(), 0, + "no such mixer control: %s", om->control); + return NULL; + } + } else + om->volume_control = SOUND_MIXER_PCM; + + return &om->base; +} + +static void +oss_mixer_finish(struct mixer *data) +{ + struct oss_mixer *om = (struct oss_mixer *) data; + + g_free(om); +} + +static void +oss_mixer_close(struct mixer *data) +{ + struct oss_mixer *om = (struct oss_mixer *) data; + + assert(om->device_fd >= 0); + + close(om->device_fd); +} + +static bool +oss_mixer_open(struct mixer *data, GError **error_r) +{ + struct oss_mixer *om = (struct oss_mixer *) data; + + om->device_fd = open_cloexec(om->device, O_RDONLY, 0); + if (om->device_fd < 0) { + g_set_error(error_r, oss_mixer_quark(), errno, + "failed to open %s: %s", + om->device, g_strerror(errno)); + return false; + } + + if (om->control) { + int devmask = 0; + + if (ioctl(om->device_fd, SOUND_MIXER_READ_DEVMASK, &devmask) < 0) { + g_set_error(error_r, oss_mixer_quark(), errno, + "READ_DEVMASK failed: %s", + g_strerror(errno)); + oss_mixer_close(data); + return false; + } + + if (((1 << om->volume_control) & devmask) == 0) { + g_set_error(error_r, oss_mixer_quark(), 0, + "mixer control \"%s\" not usable", + om->control); + oss_mixer_close(data); + return false; + } + } + return true; +} + +static int +oss_mixer_get_volume(struct mixer *mixer, GError **error_r) +{ + struct oss_mixer *om = (struct oss_mixer *)mixer; + int left, right, level; + int ret; + + assert(om->device_fd >= 0); + + ret = ioctl(om->device_fd, MIXER_READ(om->volume_control), &level); + if (ret < 0) { + g_set_error(error_r, oss_mixer_quark(), errno, + "failed to read OSS volume: %s", + g_strerror(errno)); + return false; + } + + left = level & 0xff; + right = (level & 0xff00) >> 8; + + if (left != right) { + g_warning("volume for left and right is not the same, \"%i\" and " + "\"%i\"\n", left, right); + } + + return left; +} + +static bool +oss_mixer_set_volume(struct mixer *mixer, unsigned volume, GError **error_r) +{ + struct oss_mixer *om = (struct oss_mixer *)mixer; + int level; + int ret; + + assert(om->device_fd >= 0); + assert(volume <= 100); + + level = (volume << 8) + volume; + + ret = ioctl(om->device_fd, MIXER_WRITE(om->volume_control), &level); + if (ret < 0) { + g_set_error(error_r, oss_mixer_quark(), errno, + "failed to set OSS volume: %s", + g_strerror(errno)); + return false; + } + + return true; +} + +const struct mixer_plugin oss_mixer_plugin = { + oss_mixer_init, + oss_mixer_finish, + oss_mixer_open, + oss_mixer_close, + oss_mixer_get_volume, + oss_mixer_set_volume, + true, +}; |