diff options
Diffstat (limited to 'src/mixer/oss_mixer.c')
| -rw-r--r-- | src/mixer/oss_mixer.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/src/mixer/oss_mixer.c b/src/mixer/oss_mixer.c new file mode 100644 index 00000000..ca4027f7 --- /dev/null +++ b/src/mixer/oss_mixer.c @@ -0,0 +1,197 @@ + +#include <glib.h> +#include <sys/stat.h> +#include <sys/ioctl.h> +#include <fcntl.h> +#include <errno.h> +#include <stdlib.h> +#include <unistd.h> + +#include "../output_api.h" +#include "../mixer.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 { + const char *device; + const char *control; + int device_fd; + int volume_control; +}; + +struct oss_mixer *oss_mixer_init(void); +void oss_mixer_finish(struct oss_mixer *am); +void oss_mixer_configure(struct oss_mixer *am, ConfigParam *param); +bool oss_mixer_open(struct oss_mixer *am); +bool oss_mixer_control(struct oss_mixer *am, int cmd, void *arg); +void oss_mixer_close(struct oss_mixer *am); + +struct oss_mixer * +oss_mixer_init(void) +{ + struct oss_mixer *om = g_malloc(sizeof(struct oss_mixer)); + om->device = NULL; + om->control = NULL; + om->device_fd = -1; + om->volume_control = SOUND_MIXER_PCM; + return om; +} + +void +oss_mixer_finish(struct oss_mixer *om) +{ + g_free(om); +} + +void +oss_mixer_configure(struct oss_mixer *om, ConfigParam *param) +{ + BlockParam *bp; + bp = getBlockParam(param, "mix_device"); + if (bp) { + om->device = bp->value; + } + bp = getBlockParam(param, "mix_control"); + if (bp) { + om->control = bp->value; + } +} + +void +oss_mixer_close(struct oss_mixer *om) +{ + if (om->device_fd != -1) + while (close(om->device_fd) && errno == EINTR) ; + om->device_fd = -1; +} + +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 (strncasecmp(name, labels[i], name_length) == 0 && + (labels[i][name_length] == 0 || + labels[i][name_length] == ' ')) + return i; + } + return -1; +} + +bool +oss_mixer_open(struct oss_mixer *om) +{ + const char *device = VOLUME_MIXER_OSS_DEFAULT; + + if (om->device) { + device = om->device; + } + + if ((om->device_fd = open(device, O_RDONLY)) < 0) { + g_warning("Unable to open oss mixer \"%s\"\n", device); + return false; + } + + if (om->control) { + int i; + int devmask = 0; + + if (ioctl(om->device_fd, SOUND_MIXER_READ_DEVMASK, &devmask) < 0) { + g_warning("errors getting read_devmask for oss mixer\n"); + oss_mixer_close(om); + return false; + } + i = oss_find_mixer(om->control); + + if (i < 0) { + g_warning("mixer control \"%s\" not found\n", + om->control); + oss_mixer_close(om); + return false; + } else if (!((1 << i) & devmask)) { + g_warning("mixer control \"%s\" not usable\n", + om->control); + oss_mixer_close(om); + return false; + } + om->volume_control = i; + } + return true; +} + +bool +oss_mixer_control(struct oss_mixer *om, int cmd, void *arg) +{ + switch (cmd) { + case AC_MIXER_CONFIGURE: + oss_mixer_configure(om, (ConfigParam *)arg); + //if (om->device_fd >= 0) + oss_mixer_close(om); + return true; + break; + case AC_MIXER_GETVOL: + { + int left, right, level; + int *ret; + + if (om->device_fd < 0 && !oss_mixer_open(om)) { + return false; + } + + if (ioctl(om->device_fd, MIXER_READ(om->volume_control), &level) < 0) { + oss_mixer_close(om); + g_warning("unable to read oss volume\n"); + 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); + } + ret = (int *) arg; + *ret = left; + return true; + } + case AC_MIXER_SETVOL: + { + int new; + int level; + int *value = arg; + + if (om->device_fd < 0 && !oss_mixer_open(om)) { + return false; + } + + new = *value; + if (new < 0) { + new = 0; + } else if (new > 100) { + new = 100; + } + + level = (new << 8) + new; + + if (ioctl(om->device_fd, MIXER_WRITE(om->volume_control), &level) < 0) { + g_warning("unable to set oss volume\n"); + oss_mixer_close(om); + return false; + } + return true; + } + default: + g_warning("Unsuported oss control\n"); + break; + } + return false; +} |