Report volume like alsamixer. Maybe.

I have no idea how they calculate dB.

.gitignore

@@ -4,8 +4,6 @@ MANIFEST
 doc/gh-pages/
 doc/html/
 doc/doctrees/
-doc/_build/
 gh-pages/
 build/
 dist/
-.vscode/

CHANGES

@@ -1,32 +1,3 @@
-Version 0.8.6:
-- Added four methods to the 'PCM' class to allow users to get detailed information about the device:
-
-  - 'getformats()' returns a dictionary of name / value pairs, one for each of the card's
-    supported formats - e.g. '{"U8": 1, "S16_LE": 2}',
-  - 'getchannels()' returns a list of the supported channel numbers, e.g. '[1, 2]',
-  - 'getrates()' returns supported sample rates for the device, e.g. '[48000]',
-  - 'getratebounds()' returns the device's official minimum and maximum supported 
-    sample rates as a tuple, e.g. '(4000, 48000)'.
-  
-  (#82 contributed by @jdstmporter)
-
-- Prevent hang on close after capturing audio (#80 contributed by @daym)
-
-Version 0.8.5:
-- Return an empty string/bytestring when 'read()' detects an 
-  overrun. Previously the returned data was undefined (contributed by @jcea)
-
-- Unlimited setperiod buffer size when reading frames (contributed by @jcea)
-
-Version 0.8.4:
-- Fix Python3 API usage broken in 0.8.3
-
-Version 0.8.3:
-- Add DSD sample formats (contributed by @lintweaker)
-- Add Mixer.handleevents() to acknowledge events identified by select.poll (contributed by @PaulSD)
-- Add functions for listing cards and their names (contributed by @chrisdiamand)
-- Add a method for setting enums (contributed by @chrisdiamand)
-
 Version 0.8.2:
 - fix #3 (we cannot get the revision from git for pip installs)
 

alsaaudio.c

@@ -1,4 +1,4 @@
-/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: t -*- */
+/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
 
 /*
  * alsaaudio -- Python interface to ALSA (Advanced Linux Sound Architecture).
@@ -29,65 +29,6 @@
 #include <alsa/version.h>
 #include <stdio.h>
 
-#define ARRAY_SIZE(a) (sizeof(a) / sizeof *(a))
-static const snd_pcm_format_t ALSAFormats[] = {
-	SND_PCM_FORMAT_S8,
-	SND_PCM_FORMAT_U8,
-	SND_PCM_FORMAT_S16_LE,
-	SND_PCM_FORMAT_S16_BE,
-	SND_PCM_FORMAT_U16_LE,
-	SND_PCM_FORMAT_U16_BE,
-	SND_PCM_FORMAT_S24_LE,
-	SND_PCM_FORMAT_S24_BE,
-	SND_PCM_FORMAT_U24_LE,
-	SND_PCM_FORMAT_U24_BE,
-	SND_PCM_FORMAT_S32_LE,
-	SND_PCM_FORMAT_S32_BE,
-	SND_PCM_FORMAT_U32_LE,
-	SND_PCM_FORMAT_U32_BE,
-	SND_PCM_FORMAT_FLOAT_LE,
-	SND_PCM_FORMAT_FLOAT_BE,
-	SND_PCM_FORMAT_FLOAT64_LE,
-	SND_PCM_FORMAT_FLOAT64_BE,
-	SND_PCM_FORMAT_IEC958_SUBFRAME_LE,
-	SND_PCM_FORMAT_IEC958_SUBFRAME_BE,
-	SND_PCM_FORMAT_MU_LAW,
-	SND_PCM_FORMAT_A_LAW,
-	SND_PCM_FORMAT_IMA_ADPCM,
-	SND_PCM_FORMAT_MPEG,
-	SND_PCM_FORMAT_GSM,
-	SND_PCM_FORMAT_SPECIAL,
-	SND_PCM_FORMAT_S24_3LE,
-	SND_PCM_FORMAT_S24_3BE,
-	SND_PCM_FORMAT_U24_3LE,
-	SND_PCM_FORMAT_U24_3BE,
-	SND_PCM_FORMAT_S20_3LE,
-	SND_PCM_FORMAT_S20_3BE,
-	SND_PCM_FORMAT_U20_3LE,
-	SND_PCM_FORMAT_U20_3BE,
-	SND_PCM_FORMAT_S18_3LE,
-	SND_PCM_FORMAT_S18_3BE,
-	SND_PCM_FORMAT_U18_3LE,
-	SND_PCM_FORMAT_U18_3BE
-};
-
-static const unsigned ALSARates[] = {
-	4000,
-	5512,
-	8000,
-	11025,
-	16000,
-	22050,
-	32000,
-	44100,
-	48000,
-	64000,
-	88200,
-	96000,
-	176400,
-	192000
-};
-
 PyDoc_STRVAR(alsaaudio_module_doc,
              "This modules provides support for the ALSA audio API.\n"
              "\n"
@@ -107,7 +48,7 @@ typedef struct {
 
     // Configurable parameters
     int channels;
-	unsigned int rate;
+    int rate;
     int format;
     snd_pcm_uframes_t periodsize;
     int framesize;
@@ -136,6 +77,12 @@ typedef struct {
     snd_mixer_t *handle;
 } alsamixer_t;
 
+typedef enum {
+    unit_percent,
+    unit_dB,
+    unit_last
+} volume_unit_t;   
+
 /******************************************/
 /* PCM object wrapper                   */
 /******************************************/
@@ -370,9 +317,8 @@ static int alsapcm_setup(alsapcm_t *self)
        and fill it with configuration space */
     snd_pcm_hw_params_alloca(&hwparams);
     res = snd_pcm_hw_params_any(self->handle, hwparams);
-	if (res < 0) {
+    if (res < 0)
         return res;
-	}
 
     /* Fill it with default values.
 
@@ -387,11 +333,10 @@ static int alsapcm_setup(alsapcm_t *self)
                                    self->channels);
 
     dir = 0;
-	unsigned int periods = 4;
+    snd_pcm_hw_params_set_rate(self->handle, hwparams, self->rate, dir);
-	snd_pcm_hw_params_set_rate_near(self->handle, hwparams, &self->rate, &dir);
+    snd_pcm_hw_params_set_period_size(self->handle, hwparams,
-	snd_pcm_hw_params_set_period_size_near(self->handle, hwparams,
+                                      self->periodsize, dir);
-										   &self->periodsize, &dir);
+    snd_pcm_hw_params_set_periods(self->handle, hwparams, 4, 0);
-	snd_pcm_hw_params_set_periods_near(self->handle, hwparams, &periods, &dir);
 
     /* Write it to the device */
     res = snd_pcm_hw_params(self->handle, hwparams);
@@ -423,16 +368,11 @@ alsapcm_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
     char *card = NULL;
     int cardidx = -1;
     char hw_device[128];
-	int rate = 44100;
+    char *kw[] = { "type", "mode", "device", "cardindex", "card", NULL };
-	int channels = 2;
-	int format = SND_PCM_FORMAT_S16_LE;
-	int periodsize = 32;
 
-	char *kw[] = { "type", "mode", "device", "cardindex", "card", "rate", "channels", "format", "periodsize", NULL };
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "|Oisiz", kw,
-
-	if (!PyArg_ParseTupleAndKeywords(args, kwds, "|Oisiziiii", kw,
                                      &pcmtypeobj, &pcmmode, &device,
-									 &cardidx, &card, &rate, &channels, &format, &periodsize))
+                                     &cardidx, &card))
         return NULL;
 
     if (cardidx >= 0) {
@@ -476,10 +416,10 @@ alsapcm_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
     self->handle = 0;
     self->pcmtype = pcmtype;
     self->pcmmode = pcmmode;
-	self->channels = channels;
+    self->channels = 2;
-	self->rate = rate;
+    self->rate = 44100;
-	self->format = format;
+    self->format = SND_PCM_FORMAT_S16_LE;
-	self->periodsize = periodsize;
+    self->periodsize = 32;
 
     res = snd_pcm_open(&(self->handle), device, self->pcmtype,
                        self->pcmmode);
@@ -506,7 +446,6 @@ alsapcm_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 static void alsapcm_dealloc(alsapcm_t *self)
 {
     if (self->handle) {
-		snd_pcm_pause(self->handle, 1);
         snd_pcm_drain(self->handle);
         snd_pcm_close(self->handle);
     }
@@ -639,184 +578,6 @@ alsapcm_dumpinfo(alsapcm_t *self, PyObject *args)
     return Py_None;
 }
 
-// auxiliary function
-
-
-static PyObject *
-alsapcm_getformats(alsapcm_t *self, PyObject *args)
-{
-	snd_pcm_t *pcm = self->handle;
-	if (!pcm) {
-		PyErr_SetString(ALSAAudioError, "PCM device is closed");
-		return NULL;
-	}
-
-	snd_pcm_hw_params_t *params;
-	snd_pcm_hw_params_alloca(&params);
-	int err = snd_pcm_hw_params_any(pcm, params);
-	if (err < 0) {
-		PyErr_SetString(ALSAAudioError, "Cannot get hardware parameters");
-		return NULL;
-	}
-
-	PyObject *fmts = PyDict_New();
-	for (size_t i = 0; i < ARRAY_SIZE(ALSAFormats); ++i) {
-		snd_pcm_format_t format = ALSAFormats[i];
-		if (!snd_pcm_hw_params_test_format(pcm, params, format)) {
-			const char *name = snd_pcm_format_name(format);
-			PyObject *pname=PyUnicode_FromString(name);
-			PyObject *value=PyLong_FromLong((long)format);
-			PyDict_SetItem(fmts,pname,value);
-		}
-	}
-	return fmts;
-}
-
-PyDoc_STRVAR(getformats_doc,
-"getformats() -> [str:int]\n\
-\n\
-Returns dictionary of supported format codes keyed by their standard ALSA names.");
-
-static PyObject *
-alsapcm_getratemaxmin(alsapcm_t *self, PyObject *args)
-{
-	snd_pcm_t *pcm = self->handle;
-	if (!pcm) {
-		PyErr_SetString(ALSAAudioError, "PCM device is closed");
-		return NULL;
-	}
-
-	snd_pcm_hw_params_t *params;
-	snd_pcm_hw_params_alloca(&params);
-	int err = snd_pcm_hw_params_any(pcm, params);
-	if (err < 0) {
-		PyErr_SetString(ALSAAudioError, "Cannot get hardware parameters");
-		return NULL;
-	}
-
-	unsigned min, max;
-	if (snd_pcm_hw_params_get_rate_min(params, &min,NULL)<0) {
-		PyErr_SetString(ALSAAudioError, "Cannot get minimum supported bitrate");
-		return NULL;
-	}
-	if (snd_pcm_hw_params_get_rate_max(params, &max,NULL)<0) {
-		PyErr_SetString(ALSAAudioError, "Cannot get maximum supported bitrate");
-		return NULL;
-	}
-	
-	PyObject *minp=PyLong_FromLong(min);
-	PyObject *maxp=PyLong_FromLong(max);
-	return PyTuple_Pack(2, minp, maxp);
-}
-
-PyDoc_STRVAR(getratebounds_doc,
-"getratebounds() -> (int,int)\n\
-\n\
-Returns the card's minimum and maximum supported sample rates as a tuple.");
-
-static PyObject *
-alsapcm_getrates(alsapcm_t *self, PyObject *args)
-{
-	snd_pcm_t *pcm = self->handle;
-	if (!pcm) {
-		PyErr_SetString(ALSAAudioError, "PCM device is closed");
-		return NULL;
-	}
-
-	snd_pcm_hw_params_t *params;
-	snd_pcm_hw_params_alloca(&params);
-	int err = snd_pcm_hw_params_any(pcm, params);
-	if (err < 0) {
-		PyErr_SetString(ALSAAudioError, "Cannot get hardware parameters");
-		return NULL;
-	}
-	
-	unsigned min, max;
-	if (snd_pcm_hw_params_get_rate_min(params, &min, NULL) <0 ) {
-		PyErr_SetString(ALSAAudioError, "Cannot get minimum supported bitrate");
-		return NULL;
-	}
-	if (snd_pcm_hw_params_get_rate_max(params, &max, NULL) < 0) {
-		PyErr_SetString(ALSAAudioError, "Cannot get maximum supported bitrate");
-		return NULL;
-	}
-	
-	if (min == max) {
-		return PyLong_FromLong(min);
-	}
-	else if (!snd_pcm_hw_params_test_rate(pcm, params, min + 1, 0)) {
-		PyObject *minp=PyLong_FromLong(min);
-		PyObject *maxp=PyLong_FromLong(max);
-		return PyTuple_Pack(2,minp,maxp);
-	}
-	else {
-		PyObject *rates=PyList_New(0);
-		for (size_t i=0; i<ARRAY_SIZE(ALSARates); i++) {
-			unsigned rate = ALSARates[i];
-			if (!snd_pcm_hw_params_test_rate(pcm, params, rate, 0)) {
-				PyObject *prate=PyLong_FromLong(rate);
-				PyList_Append(rates,prate);
-			}
-		}
-		return rates;
-	}
-}
-
-PyDoc_STRVAR(getrates_doc,
-"getrates() -> obj\n\
-\n\
-Returns the sample rates supported by the device.\
-Returned value can be one of three types, depending on the card's properties.\
-There are three cases:\n\
-\n\
-- Card supports only a single rate: returns the rate\n\
-- Card supports a continuous range of rates: returns a tuple of the range's lower and upper bounds (inclusive)\n\
-- Card supports a collection of well-known rates: returns a list of the supported rates");
-
-static PyObject *
-alsapcm_getchannels(alsapcm_t *self,PyObject *args)
-{
-	snd_pcm_t *pcm = self->handle;
-	if (!pcm) {
-		PyErr_SetString(ALSAAudioError, "PCM device is closed");
-		return NULL;
-	}
-
-	snd_pcm_hw_params_t *params;
-	snd_pcm_hw_params_alloca(&params);
-	int err = snd_pcm_hw_params_any(pcm, params);
-	if (err < 0) {
-		PyErr_SetString(ALSAAudioError, "Cannot get hardware parameters");
-		return NULL;
-	}
-
-	unsigned min, max;
-	if (snd_pcm_hw_params_get_channels_min(params, &min) < 0) {
-		PyErr_SetString(ALSAAudioError, "Cannot get minimum supported number of channels");
-		return NULL;
-	}
-
-	if (snd_pcm_hw_params_get_channels_max(params, &max) < 0) {
-		PyErr_SetString(ALSAAudioError, "Cannot get maximum supported number of channels");
-		return NULL;
-	}
-
-	PyObject *out = PyList_New(0);
-	for (unsigned ch=min;ch<=max;++ch) {
-		if (!snd_pcm_hw_params_test_channels(pcm, params, ch)) {
-			PyObject *pch=PyLong_FromLong(ch);
-			PyList_Append(out,pch);
-		}
-	}
-	return out;
-}
-
-PyDoc_STRVAR(getchannels_doc,
-"getchannels() -> [int]\n\
-\n\
-Returns list of supported channel numbers.");
-
-
 static PyObject *
 alsapcm_pcmtype(alsapcm_t *self, PyObject *args)
 {
@@ -883,9 +644,8 @@ Returns the name of the sound card used by this PCM object.");
 static PyObject *
 alsapcm_setchannels(alsapcm_t *self, PyObject *args)
 {
-	int channels, saved;
+    int channels;
     int res;
-
     if (!PyArg_ParseTuple(args,"i:setchannels", &channels))
         return NULL;
 
@@ -894,16 +654,10 @@ alsapcm_setchannels(alsapcm_t *self, PyObject *args)
         return NULL;
     }
 
-	PyErr_WarnEx(PyExc_DeprecationWarning,
-				 "This function is deprecated. "
-				 "Please use the named parameter `channels` to `PCM()` instead", 1);
-
-	saved = self->channels;
     self->channels = channels;
     res = alsapcm_setup(self);
     if (res < 0)
     {
-		self->channels = saved;
         PyErr_Format(ALSAAudioError, "%s [%s]", snd_strerror(res),
                      self->cardname);
         return NULL;
@@ -914,8 +668,6 @@ alsapcm_setchannels(alsapcm_t *self, PyObject *args)
 PyDoc_STRVAR(setchannels_doc,
 "setchannels(numchannels)\n\
 \n\
-Deprecated since 0.9\n\
-\n\
 Used to set the number of capture or playback channels. Common values\n\
 are: 1 = mono, 2 = stereo, and 6 = full 6 channel audio.\n\
 \n\
@@ -925,9 +677,8 @@ Few sound cards support more than 2 channels.");
 static PyObject *
 alsapcm_setrate(alsapcm_t *self, PyObject *args)
 {
-	int rate, saved;
+    int rate;
     int res;
-
     if (!PyArg_ParseTuple(args,"i:setrate", &rate))
         return NULL;
 
@@ -937,16 +688,10 @@ alsapcm_setrate(alsapcm_t *self, PyObject *args)
         return NULL;
     }
 
-	PyErr_WarnEx(PyExc_DeprecationWarning,
-				 "This function is deprecated. "
-				 "Please use the named parameter `rate` to `PCM()` instead", 1);
-
-	saved = self->rate;
     self->rate = rate;
     res = alsapcm_setup(self);
     if (res < 0)
     {
-		self->rate = saved;
         PyErr_Format(ALSAAudioError, "%s [%s]", snd_strerror(res),
                      self->cardname);
         return NULL;
@@ -957,8 +702,6 @@ alsapcm_setrate(alsapcm_t *self, PyObject *args)
 PyDoc_STRVAR(setrate_doc,
 "setrate(rate)\n\
 \n\
-Deprecated since 0.9\n\
-\n\
 Set the sample rate in Hz for the device. Typical values are\n\
 8000 (telephony), 11025, 44100 (CD), 48000 (DVD audio) and 96000");
 
@@ -966,9 +709,8 @@ Set the sample rate in Hz for the device. Typical values are\n\
 static PyObject *
 alsapcm_setformat(alsapcm_t *self, PyObject *args)
 {
-	int format, saved;
+    int format;
     int res;
-
     if (!PyArg_ParseTuple(args,"i:setformat", &format))
         return NULL;
 
@@ -978,16 +720,10 @@ alsapcm_setformat(alsapcm_t *self, PyObject *args)
         return NULL;
     }
 
-	PyErr_WarnEx(PyExc_DeprecationWarning,
-				 "This function is deprecated. "
-				 "Please use the named parameter `format` to `PCM()` instead", 1);
-
-	saved = self->format;
     self->format = format;
     res = alsapcm_setup(self);
     if (res < 0)
     {
-		self->format = saved;
         PyErr_Format(ALSAAudioError, "%s [%s]", snd_strerror(res),
                      self->cardname);
         return NULL;
@@ -996,14 +732,12 @@ alsapcm_setformat(alsapcm_t *self, PyObject *args)
 }
 
 PyDoc_STRVAR(setformat_doc,
-"setformat(rate)\n\
+"setformat(rate)\n");
-\n\
-Deprecated since 0.9");
 
 static PyObject *
 alsapcm_setperiodsize(alsapcm_t *self, PyObject *args)
 {
-	int periodsize, saved;
+    int periodsize;
     int res;
 
     if (!PyArg_ParseTuple(args,"i:setperiodsize", &periodsize))
@@ -1015,32 +749,21 @@ alsapcm_setperiodsize(alsapcm_t *self, PyObject *args)
         return NULL;
     }
 
-	PyErr_WarnEx(PyExc_DeprecationWarning,
-				 "This function is deprecated. "
-				 "Please use the named parameter `periodsize` to `PCM()` instead", 1);
-
-	saved = self->periodsize;
     self->periodsize = periodsize;
     res = alsapcm_setup(self);
     if (res < 0)
     {
-		self->periodsize = saved;
         PyErr_Format(ALSAAudioError, "%s [%s]", snd_strerror(res),
                      self->cardname);
 
-		
-		
         return NULL;
     }
-
     return PyLong_FromLong(self->periodsize);
 }
 
 PyDoc_STRVAR(setperiodsize_doc,
 "setperiodsize(period) -> int\n\
 \n\
-Deprecated since 0.9\n\
-\n\
 Sets the actual period size in frames. Each write should consist of\n\
 exactly this number of frames, and each read will return this number of\n\
 frames (unless the device is in PCM_NONBLOCK mode, in which case it\n\
@@ -1050,9 +773,14 @@ static PyObject *
 alsapcm_read(alsapcm_t *self, PyObject *args)
 {
     int res;
-	int size = self->framesize * self->periodsize;
+    char buffer[8000];
-	PyObject *buffer_obj, *tuple_obj, *res_obj;
+
-	char *buffer;
+    if (self->framesize * self->periodsize > 8000) {
+
+        PyErr_SetString(ALSAAudioError,"Capture data too large. "
+                        "Try decreasing period size");
+        return NULL;
+    }
 
     if (!PyArg_ParseTuple(args,":read"))
         return NULL;
@@ -1069,18 +797,6 @@ alsapcm_read(alsapcm_t *self, PyObject *args)
         return NULL;
     }
 
-#if PY_MAJOR_VERSION < 3
-	buffer_obj = PyString_FromStringAndSize(NULL, size);
-	if (!buffer_obj)
-		return NULL;
-	buffer = PyString_AS_STRING(buffer_obj);
-#else
-	buffer_obj = PyBytes_FromStringAndSize(NULL, size);
-	if (!buffer_obj)
-		return NULL;
-	buffer = PyBytes_AS_STRING(buffer_obj);
-#endif
-
     Py_BEGIN_ALLOW_THREADS
     res = snd_pcm_readi(self->handle, buffer, self->periodsize);
     if (res == -EPIPE)
@@ -1100,39 +816,15 @@ alsapcm_read(alsapcm_t *self, PyObject *args)
             PyErr_Format(ALSAAudioError, "%s [%s]", snd_strerror(res),
                          self->cardname);
 
-			Py_DECREF(buffer_obj);
             return NULL;
         }
     }
 
-	if (res <= 0) {
 #if PY_MAJOR_VERSION < 3
-		/* If the following fails, it will free the object */
+    return Py_BuildValue("is#", res, buffer, res*self->framesize);
-		if (_PyString_Resize(&buffer_obj, 0))
-			return NULL;
 #else
-		/* If the following fails, it will free the object */
+    return Py_BuildValue("iy#", res, buffer, res*self->framesize);
-		if (_PyBytes_Resize(&buffer_obj, 0))
-			return NULL;
 #endif
-	}
-
-	res_obj = PyLong_FromLong(res);
-	if (!res_obj) {
-		Py_DECREF(buffer_obj);
-		return NULL;
-	}
-	tuple_obj = PyTuple_New(2);
-	if (!tuple_obj) {
-		Py_DECREF(buffer_obj);
-		Py_DECREF(res_obj);
-		return NULL;
-	}
-	/* Steal reference counts */
-	PyTuple_SET_ITEM(tuple_obj, 0, res_obj);
-	PyTuple_SET_ITEM(tuple_obj, 1, buffer_obj);
-
-	return tuple_obj;
 }
 
 PyDoc_STRVAR(read_doc,
@@ -1264,43 +956,6 @@ PyDoc_STRVAR(pause_doc,
 If enable is 1, playback or capture is paused. If enable is 0,\n\
 playback/capture is resumed.");
 
-
-static PyObject *alsapcm_drop(alsapcm_t *self)
-{
-	int res;
-
-	if (!self->handle) {
-		PyErr_SetString(ALSAAudioError, "PCM device is closed");
-		return NULL;
-	}
-
-	res = snd_pcm_drop(self->handle);
-
-	if (res < 0)
-	{
-		PyErr_Format(ALSAAudioError, "%s [%s]", snd_strerror(res),
-					 self->cardname);
-
-		return NULL;
-	}
-	
-	res = snd_pcm_prepare(self->handle);
-	if (res < 0)
-	{
-		PyErr_Format(ALSAAudioError, "%s [%s]", snd_strerror(res),
-					 self->cardname);
-
-		return NULL;
-	}
-	
-	return PyLong_FromLong(res);
-}
-
-PyDoc_STRVAR(drop_doc,
-"drop(enable=1)\n\
-\n\
-stop current read and drop residual packet");
-
 static PyObject *
 alsapcm_polldescriptors(alsapcm_t *self, PyObject *args)
 {
@@ -1371,14 +1026,9 @@ static PyMethodDef alsapcm_methods[] = {
     {"setperiodsize", (PyCFunction)alsapcm_setperiodsize, METH_VARARGS,
      setperiodsize_doc},
     {"dumpinfo", (PyCFunction)alsapcm_dumpinfo, METH_VARARGS},
-	{"getformats", (PyCFunction)alsapcm_getformats, METH_VARARGS, getformats_doc},
-	{"getratebounds", (PyCFunction)alsapcm_getratemaxmin, METH_VARARGS, getratebounds_doc},
-	{"getrates", (PyCFunction)alsapcm_getrates, METH_VARARGS, getrates_doc},
-	{"getchannels", (PyCFunction)alsapcm_getchannels, METH_VARARGS, getchannels_doc},
     {"read", (PyCFunction)alsapcm_read, METH_VARARGS, read_doc},
     {"write", (PyCFunction)alsapcm_write, METH_VARARGS, write_doc},
     {"pause", (PyCFunction)alsapcm_pause, METH_VARARGS, pause_doc},
-	{"drop", (PyCFunction)alsapcm_drop, METH_VARARGS, drop_doc},
     {"close", (PyCFunction)alsapcm_close, METH_VARARGS, pcm_close_doc},
     {"polldescriptors", (PyCFunction)alsapcm_polldescriptors, METH_VARARGS,
      pcm_polldescriptors_doc},
@@ -1862,43 +1512,43 @@ alsamixer_switchcap(alsamixer_t *self, PyObject *args)
     }
 
     result = PyList_New(0);
-	if (self->switch_cap & MIXER_CAP_SWITCH)
+    if (self->volume_cap & MIXER_CAP_SWITCH)
     {
         item = PyUnicode_FromString("Mute");
         PyList_Append(result, item);
         Py_DECREF(item);
     }
-	if (self->switch_cap & MIXER_CAP_SWITCH_JOINED)
+    if (self->volume_cap & MIXER_CAP_SWITCH_JOINED)
     {
         item = PyUnicode_FromString("Joined Mute");
         PyList_Append(result, item);
         Py_DECREF(item);
     }
-	if (self->switch_cap & MIXER_CAP_PSWITCH)
+    if (self->volume_cap & MIXER_CAP_PSWITCH)
     {
         item = PyUnicode_FromString("Playback Mute");
         PyList_Append(result, item);
         Py_DECREF(item);
     }
-	if (self->switch_cap & MIXER_CAP_PSWITCH_JOINED)
+    if (self->volume_cap & MIXER_CAP_PSWITCH_JOINED)
     {
         item = PyUnicode_FromString("Joined Playback Mute");
         PyList_Append(result, item);
         Py_DECREF(item);
     }
-	if (self->switch_cap & MIXER_CAP_CSWITCH)
+    if (self->volume_cap & MIXER_CAP_CSWITCH)
     {
         item = PyUnicode_FromString("Capture Mute");
         PyList_Append(result, item);
         Py_DECREF(item);
     }
-	if (self->switch_cap & MIXER_CAP_CSWITCH_JOINED)
+    if (self->volume_cap & MIXER_CAP_CSWITCH_JOINED)
     {
         item = PyUnicode_FromString("Joined Capture Mute");
         PyList_Append(result, item);
         Py_DECREF(item);
     }
-	if (self->switch_cap & MIXER_CAP_CSWITCH_EXCLUSIVE)
+    if (self->volume_cap & MIXER_CAP_CSWITCH_EXCLUSIVE)
     {
         item = PyUnicode_FromString("Capture Exclusive");
         PyList_Append(result, item);
@@ -1923,21 +1573,31 @@ Possible values in this list are:\n\
  - 'Capture Exclusive'\n");
 
 
-static int alsamixer_getpercentage(long min, long max, long value)
+static double 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 (double)value/(double)range * 100.0;
-	return tmp;
 }
 
-static long alsamixer_getphysvolume(long min, long max, int percentage)
+static double alsamixer_getdB(long min, long max, long value)
+{
+    /* Convert from number in range to dB */
+    int range = max - min;
+
+    if (range == 0)
+        return 0;
+
+    value -= min;
+    return log10((double)value/range) * 60.0;
+}
+
+static long alsamixer_getphysvolume(long min, long max, double percentage)
 {
     /* Convert from percentage to number in range */
     int range = max - min;
@@ -1946,57 +1606,76 @@ static long alsamixer_getphysvolume(long min, long max, int percentage)
     if (range == 0)
         return 0;
 
-	tmp = rint((double)range * ((double)percentage*.01)) + min;
+    tmp = rint((double)range * (percentage * .01)) + min;
     return tmp;
 }
 
 static PyObject *
-alsamixer_getvolume(alsamixer_t *self, PyObject *args)
+alsamixer_getvolume(alsamixer_t *self, PyObject *args, PyObject *kw)
 {
     snd_mixer_elem_t *elem;
     int channel;
     long ival;
-	PyObject *pcmtypeobj = NULL;
+    PyObject *dirobj = NULL;
-	long pcmtype;
+    long dir;
+    int unit = unit_percent;
     PyObject *result;
     PyObject *item;
 
-	if (!PyArg_ParseTuple(args,"|O:getvolume", &pcmtypeobj))
+    static char *kwlist[] = { "direction", "unit", NULL };
+    
+    if (!PyArg_ParseTupleAndKeywords(args, kw, "|Oi:getvolume", kwlist, &dirobj, &unit))
         return NULL;
 
+    if (unit >= unit_last) {
+        PyErr_SetString(PyExc_ValueError, "unit must be 'percent' or 'dB'");
+        return NULL;
+    }
+    
+    dir = get_pcmtype(dirobj);
+    if (dir < 0) {
+        return NULL;
+    }
+
     if (!self->handle)
     {
         PyErr_SetString(ALSAAudioError, "Mixer is closed");
         return NULL;
     }
 
-	pcmtype = get_pcmtype(pcmtypeobj);
-	if (pcmtype < 0) {
-		return NULL;
-	}
-
     elem = alsamixer_find_elem(self->handle,self->controlname,self->controlid);
 
     result = PyList_New(0);
 
     for (channel = 0; channel <= SND_MIXER_SCHN_LAST; channel++) {
-		if (pcmtype == SND_PCM_STREAM_PLAYBACK &&
+        if (dir == SND_PCM_STREAM_PLAYBACK &&
             snd_mixer_selem_has_playback_channel(elem, channel))
         {
             snd_mixer_selem_get_playback_volume(elem, channel, &ival);
-			item = PyLong_FromLong(alsamixer_getpercentage(self->pmin,
+            if (unit == unit_percent) {
-														   self->pmax,
+                item = PyFloat_FromDouble(
-														   ival));
+                    alsamixer_getpercentage(self->pmin, self->pmax, ival));
+            }
+            else {
+                item = PyFloat_FromDouble(
+                    alsamixer_getdB(self->pmin, self->pmax, ival));
+            }
             PyList_Append(result, item);
             Py_DECREF(item);
         }
-		else if (pcmtype == SND_PCM_STREAM_CAPTURE
+        else if (dir == SND_PCM_STREAM_CAPTURE
                  && snd_mixer_selem_has_capture_channel(elem, channel)
-				 && snd_mixer_selem_has_capture_volume(elem)) {
+                 && snd_mixer_selem_has_capture_volume(elem))
+        {
             snd_mixer_selem_get_capture_volume(elem, channel, &ival);
-			item = PyLong_FromLong(alsamixer_getpercentage(self->cmin,
+            if (unit == unit_percent) {
-														   self->cmax,
+                item = PyFloat_FromDouble(
-														   ival));
+                    alsamixer_getpercentage(self->cmin, self->cmax, ival));
+            }
+            else {
+                item = PyFloat_FromDouble(
+                    alsamixer_getdB(self->cmin, self->cmax, ival));
+            }
             PyList_Append(result, item);
             Py_DECREF(item);
         }
@@ -2006,15 +1685,17 @@ alsamixer_getvolume(alsamixer_t *self, PyObject *args)
 }
 
 PyDoc_STRVAR(getvolume_doc,
-"getvolume([pcmtype]) -> List of volume settings (int)\n\
+"getvolume(direction=PCM_PLAYBACK, unit=Percent) -> List of volume settings (float)\n\
 \n\
 Returns a list with the current volume settings for each channel.\n\
-The list elements are integer percentages.\n\
+The list elements are float percentages.\n\
 \n\
-The optional 'pcmtype' argument can be either PCM_PLAYBACK or\n\
+The 'direction' argument can be either PCM_PLAYBACK or\n\
 PCM_CAPTURE, which is relevant if the mixer can control both\n\
 playback and capture volume. The default value is PCM_PLAYBACK\n\
-if the mixer has this capability, otherwise PCM_CAPTURE");
+if the mixer has this capability, otherwise PCM_CAPTURE\
+\n\
+The optional 'unit' argument can be either 'percent' or 'dB'.");
 
 
 static PyObject *
@@ -2340,29 +2021,53 @@ This method will fail if the mixer has no capture switch capabilities.");
 
 
 static PyObject *
-alsamixer_setvolume(alsamixer_t *self, PyObject *args)
+alsamixer_setvolume(alsamixer_t *self, PyObject *args, PyObject *kw)
 {
     snd_mixer_elem_t *elem;
     int i;
-	long volume;
+    double volume = 0.0;
+    PyObject *volumeobj = NULL;
     int physvolume;
-	PyObject *pcmtypeobj = NULL;
+    PyObject *dirobj = NULL;
-	long pcmtype;
+    long dir;
+    int unit = unit_percent; 
     int channel = MIXER_CHANNEL_ALL;
     int done = 0;
 
-	if (!PyArg_ParseTuple(args,"l|iO:setvolume", &volume, &channel,
+    static char *kwlist[] = { "channel", "direction", "unit", NULL };
-						  &pcmtypeobj))
-		return NULL;
     
-	if (volume < 0 || volume > 100)
+    
-	{
+    if (!PyArg_ParseTupleAndKeywords(args, kw, "O|iOi:setvolume", kwlist, &volumeobj, &channel,
-		PyErr_SetString(ALSAAudioError, "Volume must be between 0 and 100");
+                                     &dirobj, &unit)) {
         return NULL;
     }
 
-	pcmtype = get_pcmtype(pcmtypeobj);
+    // unit 
-	if (pcmtype < 0) {
+    if (unit >= unit_last) {
+        PyErr_SetString(PyExc_ValueError, "unit must be 'percent' or 'dB'");
+        return NULL;
+    }
+
+    if (PyLong_Check(volumeobj)) {
+        volume = (double)PyLong_AsLong(volumeobj);
+    }
+    else if (PyFloat_Check(volumeobj)) {
+        volume = PyFloat_AsDouble(volumeobj);
+    }
+    else {
+        PyErr_SetString(PyExc_ValueError, "Volume must be integer or float");
+        return NULL;
+    }
+    
+    if (unit == unit_percent && (volume < 0.0 || volume > 100.0))
+    {
+        PyErr_SetString(PyExc_ValueError, "Volume in percent must be between 0 and 100");
+        return NULL;
+    }
+
+    // pcmtype
+    dir = get_pcmtype(dirobj);
+    if (dir < 0) {
         return NULL;
     }
 
@@ -2374,38 +2079,48 @@ alsamixer_setvolume(alsamixer_t *self, PyObject *args)
     
     elem = alsamixer_find_elem(self->handle,self->controlname,self->controlid);
 
-	if (!pcmtypeobj || (pcmtypeobj == Py_None))
+    if (!dirobj || (dirobj == Py_None))
     {
         if (self->pchannels)
-			pcmtype = SND_PCM_STREAM_PLAYBACK;
+            dir = SND_PCM_STREAM_PLAYBACK;
         else
-			pcmtype = SND_PCM_STREAM_CAPTURE;
+            dir = SND_PCM_STREAM_CAPTURE;
     }
 
     for (i = 0; i <= SND_MIXER_SCHN_LAST; i++)
     {
         if (channel == -1 || channel == i)
         {
-			if (pcmtype == SND_PCM_STREAM_PLAYBACK &&
+            if (dir == SND_PCM_STREAM_PLAYBACK &&
                 snd_mixer_selem_has_playback_channel(elem, i)) {
+                if (unit == unit_percent) {
                     physvolume = alsamixer_getphysvolume(self->pmin,
                                                          self->pmax, volume);
                     snd_mixer_selem_set_playback_volume(elem, i, physvolume);
+                }
+                else {
+                    snd_mixer_selem_set_playback_dB(elem, i, (long)(volume * 100.0), 0);
+                }
                 done++;
             }
-			else if (pcmtype == SND_PCM_STREAM_CAPTURE
+            else if (dir == SND_PCM_STREAM_CAPTURE
                      && snd_mixer_selem_has_capture_channel(elem, i)
                      && snd_mixer_selem_has_capture_volume(elem))
             {
+                if (unit == unit_percent) {
                     physvolume = alsamixer_getphysvolume(self->cmin, self->cmax,
                                                          volume);
                     snd_mixer_selem_set_capture_volume(elem, i, physvolume);
+                }
+                else {
+                    snd_mixer_selem_set_capture_dB(elem, i, (long)(volume * 100), 0);
+                }
                 done++;
             }
         }
     }
 
-	if(!done)
+    if (!done)
     {
         PyErr_Format(ALSAAudioError, "No such channel [%s]",
                      self->cardname);
@@ -2417,19 +2132,21 @@ alsamixer_setvolume(alsamixer_t *self, PyObject *args)
 }
 
 PyDoc_STRVAR(setvolume_doc,
-"setvolume(volume[[, channel] [, pcmtype]])\n\
+"setvolume(volume, channel=MIXER_CHANNEL_ALL, direction=PCM_PLAYBACK, unit='percent')\n\
 \n\
 Change the current volume settings for this mixer. The volume argument\n\
-controls the new volume setting as an integer percentage.\n\
+controls the new volume setting as a percentage.\n\
 If the optional argument channel is present, the volume is set only for\n\
 this channel. This assumes that the mixer can control the volume for the\n\
 channels independently.\n\
 \n\
-The optional direction argument can be either PCM_PLAYBACK or PCM_CAPTURE.\n\
+The optional 'direction' argument can be either PCM_PLAYBACK or PCM_CAPTURE.\n\
 It is relevant if the mixer has independent playback and capture volume\n\
 capabilities, and controls which of the volumes will be changed.\n\
-The default is 'playback' if the mixer has this capability, otherwise\n\
+The default is PCM_PLAYBACK if the mixer has this capability, otherwise\n\
-'capture'.");
+PCM_CAPTURE.\n\
+\n\
+The optional 'unit' argument can be either 'percent' (the default) or 'dB'.");
 
 
 static PyObject *
@@ -2440,6 +2157,7 @@ alsamixer_setmute(alsamixer_t *self, PyObject *args)
     int mute = 0;
     int done = 0;
     int channel = MIXER_CHANNEL_ALL;
+    
     if (!PyArg_ParseTuple(args,"i|i:setmute", &mute, &channel))
         return NULL;
 
@@ -2647,13 +2365,13 @@ static PyMethodDef alsamixer_methods[] = {
      switchcap_doc},
     {"volumecap", (PyCFunction)alsamixer_volumecap, METH_VARARGS,
      volumecap_doc},
-	{"getvolume", (PyCFunction)alsamixer_getvolume, METH_VARARGS,
+    {"getvolume", (PyCFunction)alsamixer_getvolume, METH_VARARGS | METH_KEYWORDS,
      getvolume_doc},
     {"getrange", (PyCFunction)alsamixer_getrange, METH_VARARGS, getrange_doc},
     {"getenum", (PyCFunction)alsamixer_getenum, METH_VARARGS, getenum_doc},
     {"getmute", (PyCFunction)alsamixer_getmute, METH_VARARGS, getmute_doc},
     {"getrec", (PyCFunction)alsamixer_getrec, METH_VARARGS, getrec_doc},
-	{"setvolume", (PyCFunction)alsamixer_setvolume, METH_VARARGS,
+    {"setvolume", (PyCFunction)alsamixer_setvolume, METH_VARARGS | METH_KEYWORDS,
      setvolume_doc},
     {"setenum", (PyCFunction)alsamixer_setenum, METH_VARARGS, setenum_doc},
     {"setmute", (PyCFunction)alsamixer_setmute, METH_VARARGS, setmute_doc},
@@ -2803,6 +2521,9 @@ PyObject *PyInit_alsaaudio(void)
     Py_INCREF(ALSAAudioError);
     PyModule_AddObject(m, "ALSAAudioError", ALSAAudioError);
 
+    _EXPORT_INT(m, "Percent", unit_percent);
+    _EXPORT_INT(m, "dB", unit_dB);
+
     _EXPORT_INT(m, "PCM_PLAYBACK",SND_PCM_STREAM_PLAYBACK);
     _EXPORT_INT(m, "PCM_CAPTURE",SND_PCM_STREAM_CAPTURE);
 

doc/README.md

@@ -1,22 +1,3 @@
-# Make a new release
-
-Update the version in setup.py
-
-    pyalsa_version = '0.9.0'
-
-Commit and push the update.
-
-Create and push a tag naming the version (i.e. 0.9.0):
-
-    git tag 0.9.0
-    git push origin 0.9.0
-
-Upload the package:
-
-    python3 setup.py sdist
-
-Don't forget to update the documentation.
-
 # Publish the documentation
 
 The documentation is published through the `gh-pages` branch.

doc/libalsaaudio.rst

@@ -63,6 +63,7 @@ The :mod:`alsaaudio` module defines functions and classes for using ALSA.
    useful. If you want to see a list of available PCM devices, use :func:`pcms`
    instead.
    
+
 .. function:: mixers(cardindex=-1, device='default')
 
    List the available mixers. The arguments are:
@@ -107,7 +108,7 @@ PCM objects in :mod:`alsaaudio` can play or capture (record) PCM
 sound through speakers or a microphone. The PCM constructor takes the
 following arguments:
 
-.. class:: PCM(type=PCM_PLAYBACK, mode=PCM_NORMAL, rate=44100, channels=2, format=PCM_FORMAT_S16_LE, periodsize=32, device='default', cardindex=-1)
+.. class:: PCM(type=PCM_PLAYBACK, mode=PCM_NORMAL, device='default', cardindex=-1)
 
    This class is used to represent a PCM device (either for playback and
    recording). The arguments are:
@@ -116,11 +117,72 @@ following arguments:
      (default).  
    * *mode* - can be either :const:`PCM_NONBLOCK`, or :const:`PCM_NORMAL`
      (default). 
-   * *rate* - the sampling rate in Hz. Typical values are ``8000``
+   * *device* - the name of the PCM device that should be used (for example
-    (mainly used for telephony), ``16000``, ``44100`` (default), ``48000`` and ``96000``.
+     a value from the output of :func:`pcms`). The default value is
-   * *channels* - the number of channels. The default value is 2 (stereo).
+     ``'default'``.
-   * *format* - the data format. This controls how the PCM device interprets data for playback, and how data is encoded in captures. 
+   * *cardindex* - the card index. If this argument is given, the device name
-     The default value is :const:`PCM_FORMAT_S16_LE`.
+     is constructed as 'hw:*cardindex*' and
+     the `device` keyword argument is ignored.
+     ``0`` is the first hardware sound card.
+
+   This will construct a PCM object with these default settings:
+
+   * Sample format: :const:`PCM_FORMAT_S16_LE`
+   * Rate: 44100 Hz 
+   * Channels: 2
+   * Period size: 32 frames
+
+   *Changed in 0.8:*
+   
+   - The `card` keyword argument is still supported,
+     but deprecated. Please use `device` instead.
+
+   - The keyword argument `cardindex` was added.
+
+   The `card` keyword is deprecated because it guesses the real ALSA
+   name of the card. This was always fragile and broke some legitimate usecases.
+   
+     
+PCM objects have the following methods:
+
+
+.. method:: PCM.pcmtype()
+
+   Returns the type of PCM object. Either :const:`PCM_CAPTURE` or
+   :const:`PCM_PLAYBACK`.
+
+
+.. method:: PCM.pcmmode()
+
+   Return the mode of the PCM object. One of :const:`PCM_NONBLOCK`,
+   :const:`PCM_ASYNC`, or :const:`PCM_NORMAL`
+
+
+.. method:: PCM.cardname()
+
+   Return the name of the sound card used by this PCM object.
+
+
+.. method:: PCM.setchannels(nchannels)
+
+   Used to set the number of capture or playback channels. Common
+   values are: ``1`` = mono, ``2`` = stereo, and ``6`` = full 6 channel audio.
+   Few sound cards support more than 2 channels
+
+
+.. method:: PCM.setrate(rate)
+
+   Set the sample rate in Hz for the device. Typical values are ``8000``
+   (mainly used for telephony), ``16000``, ``44100`` (CD quality),
+   ``48000`` and ``96000``.
+
+
+.. method:: PCM.setformat(format)
+
+   The sound *format* of the device. Sound format controls how the PCM device
+   interpret data for playback, and how data is encoded in captures.
+
+   The following formats are provided by ALSA:
 
    =========================  ===============
           Format                Description
@@ -154,65 +216,14 @@ following arguments:
    ``PCM_FORMAT_U24_3BE``     Unsigned 24 bit samples for each channel (Big Endian byte order in 3 bytes)
    =========================  ===============
    
-   * *periodsize* - the period size in frames. Each write should consist of *periodsize* frames. The default value is 32.
-   * *device* - the name of the PCM device that should be used (for example
-     a value from the output of :func:`pcms`). The default value is
-     ``'default'``.
-   * *cardindex* - the card index. If this argument is given, the device name
-     is constructed as 'hw:*cardindex*' and
-     the `device` keyword argument is ignored.
-     ``0`` is the first hardware sound card.
-
-   This will construct a PCM object with the given settings.
-
-   *Changed in 0.9:*
-
-   - Added the optional named parameters `rate`, `channels`, `format` and `periodsize`.
-
-   *Changed in 0.8:*
-   
-   - The `card` keyword argument is still supported,
-     but deprecated. Please use `device` instead.
-
-   - The keyword argument `cardindex` was added.
-
-   The `card` keyword is deprecated because it guesses the real ALSA
-   name of the card. This was always fragile and broke some legitimate usecases.
-   
-     
-PCM objects have the following methods:
-
-.. method:: PCM.pcmtype()
-
-   Returns the type of PCM object. Either :const:`PCM_CAPTURE` or
-   :const:`PCM_PLAYBACK`.
-
-
-.. method:: PCM.pcmmode()
-
-   Return the mode of the PCM object. One of :const:`PCM_NONBLOCK`,
-   :const:`PCM_ASYNC`, or :const:`PCM_NORMAL`
-
-
-.. method:: PCM.cardname()
-
-   Return the name of the sound card used by this PCM object.
-
-.. method:: PCM.setchannels(nchannels)
-
-   .. deprecated:: 0.9 Use the `channels` named argument to :func:`PCM`.
-
-.. method:: PCM.setrate(rate)
-
-   .. deprecated:: 0.9 Use the `rate` named argument to :func:`PCM`.
-
-.. method:: PCM.setformat(format)
-   
-   .. deprecated:: 0.9 Use the `format` named argument to :func:`PCM`.
 
 .. method:: PCM.setperiodsize(period)
 
-   .. deprecated:: 0.9 Use the `periodsize` named argument to :func:`PCM`.
+   Sets the actual period size in frames. Each write should consist of
+   exactly this number of frames, and each read will return this
+   number of frames (unless the device is in :const:`PCM_NONBLOCK` mode, in
+   which case it may return nothing at all)
+
 
 .. method:: PCM.read()
 
@@ -432,31 +443,35 @@ Mixer objects have the following methods:
    This method will fail if the mixer has no capture switch capabilities.
 
 
-.. method:: Mixer.getvolume([direction])
+.. method:: Mixer.getvolume(direction=PCM_PLAYBACK, unit=Percent)
 
    Returns a list with the current volume settings for each channel. The list
-   elements are integer percentages.
+   elements are percentages or dB values, depending on *unit*.
 
-   The optional *direction* argument can be either :const:`PCM_PLAYBACK` or
+   The *direction* argument can be either :const:`PCM_PLAYBACK` or
    :const:`PCM_CAPTURE`, which is relevant if the mixer can control both
    playback and capture volume. The default value is :const:`PCM_PLAYBACK`
    if the mixer has playback channels, otherwise it is :const:`PCM_CAPTURE`.
 
 
-.. method:: Mixer.setvolume(volume, [channel], [direction])
+.. method:: Mixer.setvolume(volume, channel=MIXER_CHANNEL_ALL, direction=PCM_PLAYBACK, unit=Percent)
 
    Change the current volume settings for this mixer. The *volume* argument
-   controls the new volume setting as an integer percentage.
+   controls the new volume setting as either a percentage or a dB value. Both
+   integer and floating point values can be given.
 
-   If the optional argument *channel* is present, the volume is set
+   The *channel* argument can be used to restrict the channels for which the volume is
-   only for this channel. This assumes that the mixer can control the
+   set. By default, the volume of all channels is adjusted. This assumes that the mixer
-   volume for the channels independently.
+   can control the volume for the channels independently.
 
-   The optional *direction* argument can be either :const:`PCM_PLAYBACK` or
+   The *direction* argument can be either :const:`PCM_PLAYBACK` or
    :const:`PCM_CAPTURE`, which is relevant if the mixer can control both
    playback and capture volume. The default value is :const:`PCM_PLAYBACK`
    if the mixer has playback channels, otherwise it is :const:`PCM_CAPTURE`.
 
+   The *unit* argument determines how the volume value is interpreted, as a prcentage
+   or as a dB value.
+   
 .. method:: Mixer.setmute(mute, [channel])
 
    Sets the mute flag to a new value. The *mute* argument is either 0 for not

doc/pyalsaaudio.rst

@@ -75,7 +75,7 @@ development at the time - and neither are very feature complete.
 I wrote PyAlsaAudio to fill this gap. My long term goal is to have the module
 included in the standard Python library, but that looks currently unlikely.
 
-PyAlsaAudio has full support for sound capture, playback of sound, as well as
+PyAlsaAudio hass full support for sound capture, playback of sound, as well as
 the ALSA Mixer API.
 
 MIDI support is not available, and since I don't own any MIDI hardware, it's

isine.py

@@ -56,7 +56,10 @@ class SinePlayer(Thread):
     def __init__(self, frequency = 440.0):
         Thread.__init__(self)
         self.setDaemon(True)
-        self.device = alsaaudio.PCM(channels=channels, format=format, rate=sampling_rate)
+        self.device = alsaaudio.PCM()
+        self.device.setchannels(channels)
+        self.device.setformat(format)
+        self.device.setrate(sampling_rate)
         self.queue = Queue()
         self.change(frequency)
 

mixertest.py

@@ -46,13 +46,17 @@ def show_mixer(name, kwargs):
     print("Capabilities: %s %s" % (' '.join(mixer.volumecap()),
                                    ' '.join(mixer.switchcap())))
     volumes = mixer.getvolume()
-    for i in range(len(volumes)):
+    for i, v in enumerate(volumes):
-        print("Channel %i volume: %i%%" % (i,volumes[i]))
+        print("Channel %i volume: %.02f%%" % (i, v))
+
+    volumes = mixer.getvolume(unit=alsaaudio.dB)
+    for i, v in enumerate(volumes):
+        print("Channel %i volume: %.02fdB" % (i, v))
 
     try:
         mutes = mixer.getmute()
-        for i in range(len(mutes)):
+        for i, m in enumerate(mutes):
-            if mutes[i]:
+            if m:
                 print("Channel %i is muted" % i)
     except alsaaudio.ALSAAudioError:
         # May not support muting
@@ -60,8 +64,8 @@ def show_mixer(name, kwargs):
 
     try:
         recs = mixer.getrec()
-        for i in range(len(recs)):
+        for i, r in enumerate(recs):
-            if recs[i]:
+            if r:
                 print("Channel %i is recording" % i)
     except alsaaudio.ALSAAudioError:
         # May not support recording

playbacktest.py

@@ -1,5 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
-# -*- mode: python; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*-
 
 ## playbacktest.py
 ##
@@ -39,11 +38,18 @@ if __name__ == '__main__':
 
     f = open(args[0], 'rb')
 
-    # Open the device in playback mode in Mono, 44100 Hz, 16 bit little endian frames
+    # Open the device in playback mode. 
+    out = alsaaudio.PCM(alsaaudio.PCM_PLAYBACK, device=device)
+
+    # Set attributes: Mono, 44100 Hz, 16 bit little endian frames
+    out.setchannels(1)
+    out.setrate(44100)
+    out.setformat(alsaaudio.PCM_FORMAT_S16_LE)
+
     # The period size controls the internal number of frames per period.
     # The significance of this parameter is documented in the ALSA api.
+    out.setperiodsize(160)
 
-    out = alsaaudio.PCM(alsaaudio.PCM_PLAYBACK, channels=1, rate=44100, format=alsaaudio.PCM_FORMAT_S16_LE, periodsize=160, device=device)
     # Read data from stdin
     data = f.read(320)
     while data:

playwav.py

@@ -1,5 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
-# -*- mode: python; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*-
 
 # Simple test script that plays (some) wav files
 
@@ -12,29 +11,28 @@ import alsaaudio
 
 def play(device, f):    
 
-	format = None
+    print('%d channels, %d sampling rate\n' % (f.getnchannels(),
+                                               f.getframerate()))
+    # Set attributes
+    device.setchannels(f.getnchannels())
+    device.setrate(f.getframerate())
 
     # 8bit is unsigned in wav files
     if f.getsampwidth() == 1:
-		format = alsaaudio.PCM_FORMAT_U8
+        device.setformat(alsaaudio.PCM_FORMAT_U8)
     # Otherwise we assume signed data, little endian
     elif f.getsampwidth() == 2:
-		format = alsaaudio.PCM_FORMAT_S16_LE
+        device.setformat(alsaaudio.PCM_FORMAT_S16_LE)
     elif f.getsampwidth() == 3:
-		format = alsaaudio.PCM_FORMAT_S24_3LE
+        device.setformat(alsaaudio.PCM_FORMAT_S24_3LE)
     elif f.getsampwidth() == 4:
-		format = alsaaudio.PCM_FORMAT_S32_LE
+        device.setformat(alsaaudio.PCM_FORMAT_S32_LE)
     else:
         raise ValueError('Unsupported format')
 
-	periodsize = f.getframerate() // 8
+    periodsize = f.getframerate() / 8
 
-	print('%d channels, %d sampling rate, format %d, periodsize %d\n' % (f.getnchannels(),
+    device.setperiodsize(periodsize)
-																		 f.getframerate(),
-																		 format,
-																		 periodsize))
-
-	device = alsaaudio.PCM(channels=f.getnchannels(), rate=f.getframerate(), format=format, periodsize=periodsize, device=device)
     
     data = f.readframes(periodsize)
     while data:
@@ -59,5 +57,9 @@ if __name__ == '__main__':
     if not args:
         usage()
         
-	with wave.open(args[0], 'rb') as f:
+    f = wave.open(args[0], 'rb')
+    device = alsaaudio.PCM(device=device)
+
     play(device, f)
+
+    f.close()

recordtest.py

@@ -1,5 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
-# -*- mode: python; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*-
 
 ## recordtest.py
 ##
@@ -40,8 +39,16 @@ if __name__ == '__main__':
 
     f = open(args[0], 'wb')
 
-	# Open the device in nonblocking capture mode in mono, with a sampling rate of 44100 Hz 
+    # Open the device in nonblocking capture mode. The last argument could
-	# and 16 bit little endian samples
+    # just as well have been zero for blocking mode. Then we could have
+    # left out the sleep call in the bottom of the loop
+    inp = alsaaudio.PCM(alsaaudio.PCM_CAPTURE, alsaaudio.PCM_NONBLOCK, device=device)
+
+    # Set attributes: Mono, 44100 Hz, 16 bit little endian samples
+    inp.setchannels(1)
+    inp.setrate(44100)
+    inp.setformat(alsaaudio.PCM_FORMAT_S16_LE)
+
     # The period size controls the internal number of frames per period.
     # The significance of this parameter is documented in the ALSA api.
     # For our purposes, it is suficcient to know that reads from the device
@@ -49,9 +56,7 @@ if __name__ == '__main__':
     # This means that the reads below will return either 320 bytes of data
     # or 0 bytes of data. The latter is possible because we are in nonblocking
     # mode.
-	inp = alsaaudio.PCM(alsaaudio.PCM_CAPTURE, alsaaudio.PCM_NONBLOCK, 
+    inp.setperiodsize(160)
-		channels=1, rate=44100, format=alsaaudio.PCM_FORMAT_S16_LE, 
-		periodsize=160, device=device)
     
     loops = 1000000
     while loops > 0:

setup.py

@@ -8,7 +8,7 @@ from setuptools import setup
 from setuptools.extension import Extension
 from sys import version
 
-pyalsa_version = '0.9.0'
+pyalsa_version = '0.8.4'
 
 if __name__ == '__main__':
     setup(

test.py

@@ -1,5 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
-# -*- mode: python; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*-
 
 # These are internal tests. They shouldn't fail, but they don't cover all
 # of the ALSA API. Most importantly PCM.read and PCM.write are missing.
@@ -13,18 +12,13 @@ import alsaaudio
 import warnings
 
 # we can't test read and write well - these are tested otherwise
-PCMMethods = [
+PCMMethods = [('pcmtype', None),
-	('pcmtype', None),
               ('pcmmode', None),
-	('cardname', None)
+              ('cardname', None),
-]
-
-PCMDeprecatedMethods = [
               ('setchannels', (2,)), 
               ('setrate', (44100,)),
               ('setformat', (alsaaudio.PCM_FORMAT_S8,)),
-	('setperiodsize', (320,))
+              ('setperiodsize', (320,))]
-]
 
 # A clever test would look at the Mixer capabilities and selectively run the
 # omitted tests, but I am too tired for that.
@@ -135,26 +129,8 @@ class PCMTest(unittest.TestCase):
                 pass
                 
             # Verify we got a DepreciationWarning
-			self.assertEqual(len(w), 1, "PCM(card='default') expected a warning" )
+            assert len(w) == 1
-			self.assertTrue(issubclass(w[-1].category, DeprecationWarning), "PCM(card='default') expected a DeprecationWarning")
+            assert issubclass(w[-1].category, DeprecationWarning)
-
-		for m, a in PCMDeprecatedMethods:
-			with warnings.catch_warnings(record=True) as w:
-				# Cause all warnings to always be triggered.
-				warnings.simplefilter("always")
-
-				pcm = alsaaudio.PCM()
-
-				f = alsaaudio.PCM.__dict__[m]
-				if a is None:
-					f(pcm)
-				else:
-					f(pcm, *a)
-
-				# Verify we got a DepreciationWarning
-				method = "%s%s" % (m, str(a))
-				self.assertEqual(len(w), 1, method + " expected a warning")
-				self.assertTrue(issubclass(w[-1].category, DeprecationWarning), method + " expected a DeprecationWarning")
                 
 if __name__ == '__main__':
     unittest.main()