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r835 | casper | 2004-10-05 23:43:58 +0200 (Tue, 05 Oct 2004) | 1 line

Added mixer example script. A few mixer fixes as well



git-svn-id: svn://svn.code.sf.net/p/pyalsaaudio/code/trunk@5 ec2f30ec-7544-0410-870e-f70ca00c83f0
This commit is contained in:
larsimmisch
2008-01-24 11:23:22 +00:00
parent dc68788ebf
commit 0acbf9b345
1 changed files with 57 additions and 13 deletions
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70
alsaaudio.c
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@@ -13,6 +13,15 @@
#include <alsa/asoundlib.h>
#include <stdio.h>
PyDoc_STRVAR(alsaaudio_module_doc,
"This modules provides support for the ALSA audio API.\n"
"\n"
"To control the PCM device, use the PCM class, Mixers\n"
"are controlled using the Mixer class.\n"
"\n"
"The following functions are also provided:\n"
"mixers() -- Return a list of available mixer names\n"
);
typedef struct {
PyObject_HEAD;
@@ -45,6 +54,11 @@ typedef struct {
unsigned int pchannels;
unsigned int cchannels;
/* min and max values for playback and capture volumes */
long pmin;
long pmax;
long cmin;
long cmax;
snd_mixer_t *handle;
} alsamixer_t;
@@ -60,9 +74,7 @@ static PyTypeObject ALSAPCMType;
static int alsapcm_setup(alsapcm_t *self) {
int res,dir;
unsigned int val;
snd_pcm_hw_params_t *hwparams;
snd_pcm_uframes_t frames;
if (self->handle) {
snd_pcm_close(self->handle);
@@ -313,9 +325,7 @@ alsapcm_setperiodsize(alsapcm_t *self, PyObject *args) {
static PyObject *
alsapcm_read(alsapcm_t *self, PyObject *args) {
int res;
int val,dir;
char buffer[8000];
snd_pcm_hw_params_t *hwparams;
if (self->framesize * self->periodsize > 8000) {
PyErr_SetString(ALSAAudioError,"Capture data too large. Try decreasing period size");
@@ -578,6 +588,8 @@ alsamixer_new(PyTypeObject *type, PyObject *args, PyObject *kwds) {
}
}
}
snd_mixer_selem_get_playback_volume_range(elem, &self->pmin, &self->pmax);
snd_mixer_selem_get_capture_volume_range(elem, &self->cmin, &self->cmax);
return (PyObject *)self;
}
@@ -651,6 +663,28 @@ alsamixer_switchcap(alsamixer_t *self, PyObject *args) {
return result;
}
static int alsamixer_getpercentage(long min, long max, long value) {
/* Convert from number in range to percentage */
int range = max - min;
int tmp;
if (range == 0) return 0;
value -= min;
tmp = rint((double)value/(double)range * 100);
return tmp;
}
static long alsamixer_getphysvolume(long min, long max, int percentage) {
/* Convert from percentage to number in range */
int range = max - min;
int tmp;
if (range == 0) return 0;
tmp = rint((double)range * ((double)percentage*.01)) + min;
return tmp;
}
static PyObject *
alsamixer_getvolume(alsamixer_t *self, PyObject *args) {
snd_mixer_elem_t *elem;
@@ -678,12 +712,12 @@ alsamixer_getvolume(alsamixer_t *self, PyObject *args) {
for (channel = 0; channel <= SND_MIXER_SCHN_LAST; channel++) {
if (direction == 0 && snd_mixer_selem_has_playback_channel(elem, channel)) {
snd_mixer_selem_get_playback_volume(elem, channel, &ival);
PyList_Append(result,PyInt_FromLong(ival));
PyList_Append(result,PyInt_FromLong(alsamixer_getpercentage(self->pmin,self->pmax,ival)));
}
else if (direction == 1 && snd_mixer_selem_has_capture_channel(elem, channel)
&& snd_mixer_selem_has_capture_volume(elem)) {
snd_mixer_selem_get_capture_volume(elem, channel, &ival);
PyList_Append(result,PyInt_FromLong(ival));
PyList_Append(result,PyInt_FromLong(alsamixer_getpercentage(self->cmin,self->cmax,ival)));
}
}
return result;
@@ -722,7 +756,7 @@ alsamixer_getrec(alsamixer_t *self, PyObject *args) {
elem = alsamixer_find_elem(self->handle,self->controlname,self->controlid);
if (!snd_mixer_selem_has_capture_switch(elem)) {
PyErr_SetString(ALSAAudioError,"Mixer has no mute switch");
PyErr_SetString(ALSAAudioError,"Mixer has no record switch");
return NULL;
}
result = PyList_New(0);
@@ -740,13 +774,18 @@ alsamixer_setvolume(alsamixer_t *self, PyObject *args) {
snd_mixer_elem_t *elem;
int direction;
int i;
int volume;
long volume;
int physvolume;
char *dirstr = 0;
int channel = MIXER_CHANNEL_ALL;
int done = 0;
if (!PyArg_ParseTuple(args,"i|is",&volume,&channel,&dirstr)) return NULL;
if (!PyArg_ParseTuple(args,"l|is",&volume,&channel,&dirstr)) return NULL;
if (volume < 0 || volume > 100) {
PyErr_SetString(ALSAAudioError,"Volume must be between 0 and 100");
return NULL;
}
elem = alsamixer_find_elem(self->handle,self->controlname,self->controlid);
if (!dirstr) {
@@ -762,12 +801,14 @@ alsamixer_setvolume(alsamixer_t *self, PyObject *args) {
for (i = 0; i <= SND_MIXER_SCHN_LAST; i++) {
if (channel == -1 || channel == i) {
if (direction == 0 && snd_mixer_selem_has_playback_channel(elem, i)) {
snd_mixer_selem_set_playback_volume(elem, i, volume);
physvolume = alsamixer_getphysvolume(self->pmin,self->pmax,volume);
snd_mixer_selem_set_playback_volume(elem, i, physvolume);
done++;
}
else if (direction == 1 && snd_mixer_selem_has_capture_channel(elem, channel)
&& snd_mixer_selem_has_capture_volume(elem)) {
snd_mixer_selem_set_capture_volume(elem, i, volume);
physvolume = alsamixer_getphysvolume(self->cmin,self->cmax,volume);
snd_mixer_selem_set_capture_volume(elem, i, physvolume);
done++;
}
}
@@ -904,7 +945,7 @@ void initalsaaudio(void) {
PyObject *m;
ALSAPCMType.tp_new = alsapcm_new;
ALSAMixerType.tp_new = alsamixer_new;
m = Py_InitModule("alsaaudio",alsaaudio_methods);
m = Py_InitModule3("alsaaudio",alsaaudio_methods,alsaaudio_module_doc);
ALSAAudioError = PyErr_NewException("alsaaudio.ALSAAudioError", NULL, NULL);
if (ALSAAudioError) {
@@ -952,4 +993,7 @@ void initalsaaudio(void) {
_EXPORT_INT(m,"PCM_FORMAT_MPEG",SND_PCM_FORMAT_MPEG);
_EXPORT_INT(m,"PCM_FORMAT_GSM",SND_PCM_FORMAT_GSM);
/* Mixer stuff */
_EXPORT_INT(m,"MIXER_CHANNEL_ALL",MIXER_CHANNEL_ALL);
}