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Support for multithreading: release the GIL around blocking operations.

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git-svn-id: svn://svn.code.sf.net/p/pyalsaaudio/code/trunk@13 ec2f30ec-7544-0410-870e-f70ca00c83f0
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larsimmisch
2008-01-24 12:26:01 +00:00
parent 8fa9d27a88
commit fa12a62e57
1 changed files with 49 additions and 15 deletions
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alsaaudio.c
+49 -15
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@@ -5,6 +5,8 @@
* Contributed by Unispeed A/S (http://www.unispeed.com)
* Author: Casper Wilstup (cwi@unispeed.dk)
*
* Bug fixes by Lars Immisch <lars@ibp.de>
*
* License: Python Software Foundation License
*
*/
@@ -75,6 +77,7 @@ static PyTypeObject ALSAPCMType;
static int alsapcm_setup(alsapcm_t *self) {
int res,dir;
unsigned int val;
snd_pcm_format_t fmt;
snd_pcm_uframes_t frames;
snd_pcm_hw_params_t *hwparams;
@@ -108,7 +111,7 @@ static int alsapcm_setup(alsapcm_t *self) {
which should therefore be sync'ed with actual values */
snd_pcm_hw_params_current(self->handle,hwparams);
snd_pcm_hw_params_get_format(hwparams,&val); self->format = val;
snd_pcm_hw_params_get_format(hwparams,&fmt); self->format = fmt;
snd_pcm_hw_params_get_channels(hwparams,&val); self->channels = val;
snd_pcm_hw_params_get_rate(hwparams,&val,&dir); self->rate = val;
snd_pcm_hw_params_get_period_size(hwparams,&frames,&dir); self->periodsize = (int) frames;
@@ -128,7 +131,7 @@ alsapcm_new(PyTypeObject *type, PyObject *args, PyObject *kwds) {
if (!(self = (alsapcm_t *)PyObject_New(alsapcm_t, &ALSAPCMType))) return NULL;
if (pcmtype != SND_PCM_STREAM_PLAYBACK && pcmtype != SND_PCM_STREAM_CAPTURE) {
PyErr_SetString(ALSAAudioError, "PCM type must be PCM_PLAYBACK (0) or PCM_CAPTUPE (1)");
PyErr_SetString(ALSAAudioError, "PCM type must be PCM_PLAYBACK (0) or PCM_CAPTURE (1)");
return NULL;
}
if (pcmmode < 0 || pcmmode > SND_PCM_ASYNC) {
@@ -170,6 +173,7 @@ static void alsapcm_dealloc(alsapcm_t *self) {
static PyObject *
alsapcm_dumpinfo(alsapcm_t *self, PyObject *args) {
unsigned int val,val2;
snd_pcm_format_t fmt;
int dir;
snd_pcm_uframes_t frames;
snd_pcm_hw_params_t *hwparams;
@@ -185,10 +189,10 @@ alsapcm_dumpinfo(alsapcm_t *self, PyObject *args) {
snd_pcm_hw_params_get_access(hwparams, (snd_pcm_access_t *) &val);
printf("access type = %s\n", snd_pcm_access_name((snd_pcm_access_t)val));
snd_pcm_hw_params_get_format(hwparams, &val);
snd_pcm_hw_params_get_format(hwparams, &fmt);
printf("format = '%s' (%s)\n",
snd_pcm_format_name((snd_pcm_format_t)val),
snd_pcm_format_description((snd_pcm_format_t)val));
snd_pcm_format_name(fmt),
snd_pcm_format_description(fmt));
snd_pcm_hw_params_get_subformat(hwparams, (snd_pcm_subformat_t *)&val);
printf("subformat = '%s' (%s)\n",
@@ -351,18 +355,24 @@ alsapcm_read(alsapcm_t *self, PyObject *args) {
return NULL;
}
Py_BEGIN_ALLOW_THREADS
res = snd_pcm_readi(self->handle, buffer, self->periodsize);
if (res == -EPIPE) {
/* EPIPE means overrun */
snd_pcm_prepare(self->handle);
}
else if (res == -EAGAIN) {
res = 0;
Py_END_ALLOW_THREADS
if (res != -EPIPE)
{
if (res == -EAGAIN) {
res = 0;
}
else if (res < 0) {
PyErr_SetString(ALSAAudioError,snd_strerror(res));
return NULL;
}
}
else if (res < 0) {
PyErr_SetString(ALSAAudioError,snd_strerror(res));
return NULL;
}
return Py_BuildValue("is#",res,buffer,res*self->framesize);
}
@@ -376,20 +386,40 @@ static PyObject *alsapcm_write(alsapcm_t *self, PyObject *args) {
PyErr_SetString(ALSAAudioError,"Data size must be a multiple of framesize");
return NULL;
}
Py_BEGIN_ALLOW_THREADS
res = snd_pcm_writei(self->handle, data, datalen/self->framesize);
if (res == -EPIPE) {
/* EPIPE means underrun */
snd_pcm_prepare(self->handle);
snd_pcm_writei(self->handle, data, datalen/self->framesize);
snd_pcm_writei(self->handle, data, datalen/self->framesize);
res = snd_pcm_recover(self->handle, res, 1);
if (res >= 0)
res = snd_pcm_writei(self->handle, data, datalen/self->framesize);
}
else if (res == -EAGAIN) {
Py_END_ALLOW_THREADS
if (res == -EAGAIN) {
return PyInt_FromLong(0);
}
else if (res < 0) {
PyErr_SetString(ALSAAudioError,snd_strerror(res));
return NULL;
}
return PyInt_FromLong(res);
}
static PyObject *alsapcm_pause(alsapcm_t *self, PyObject *args) {
int enabled, res;
if (!PyArg_ParseTuple(args,"i",&enabled)) return NULL;
Py_BEGIN_ALLOW_THREADS
res = snd_pcm_pause(self->handle, enabled);
Py_END_ALLOW_THREADS
if (res < 0) {
PyErr_SetString(ALSAAudioError,snd_strerror(res));
return NULL;
}
return PyInt_FromLong(res);
}
@@ -409,6 +439,7 @@ static PyMethodDef alsapcm_methods[] = {
{"read", (PyCFunction)alsapcm_read, METH_VARARGS},
{"write", (PyCFunction)alsapcm_write, METH_VARARGS},
{"pause", (PyCFunction)alsapcm_pause, METH_VARARGS},
{NULL, NULL}
};
@@ -958,6 +989,9 @@ void initalsaaudio(void) {
PyObject *m;
ALSAPCMType.tp_new = alsapcm_new;
ALSAMixerType.tp_new = alsamixer_new;
PyEval_InitThreads();
m = Py_InitModule3("alsaaudio",alsaaudio_methods,alsaaudio_module_doc);
ALSAAudioError = PyErr_NewException("alsaaudio.ALSAAudioError", NULL, NULL);