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add hw volume control for module-oss-mmap

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@544 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2006-02-21 00:14:25 +00:00
parent 86124abfe2
commit 893204fd57
4 changed files with 73 additions and 19 deletions
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36
src/modules/oss-util.c
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@ -166,3 +166,39 @@ int pa_oss_set_fragments(int fd, int nfrags, int frag_size) {
return 0;
}
int pa_oss_get_volume(int fd, const pa_sample_spec *ss, pa_cvolume *volume) {
char cv[PA_CVOLUME_SNPRINT_MAX];
unsigned vol;
assert(fd >= 0);
assert(ss);
assert(volume);
if (ioctl(fd, SOUND_MIXER_READ_PCM, &vol) < 0)
return -1;
volume->values[0] = ((vol & 0xFF) * PA_VOLUME_NORM) / 100;
if ((volume->channels = ss->channels) >= 2)
volume->values[1] = (((vol >> 8) & 0xFF) * PA_VOLUME_NORM) / 100;
pa_log_debug(__FILE__": Read mixer settings: %s\n", pa_cvolume_snprint(cv, sizeof(cv), volume));
return 0;
}
int pa_oss_set_volume(int fd, const pa_sample_spec *ss, const pa_cvolume *volume) {
char cv[PA_CVOLUME_SNPRINT_MAX];
unsigned vol;
vol = (volume->values[0]*100)/PA_VOLUME_NORM;
if (ss->channels >= 2)
vol |= ((volume->values[1]*100)/PA_VOLUME_NORM) << 8;
if (ioctl(fd, SOUND_MIXER_WRITE_PCM, &vol) < 0)
return -1;
pa_log_debug(__FILE__": Wrote mixer settings: %s\n", pa_cvolume_snprint(cv, sizeof(cv), volume));
return 0;
}