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cpython/Modules/ossaudiodev.c
Victor Stinner daf455554b Issue #18571: Implementation of the PEP 446: file descriptors and file handles 
are now created non-inheritable; add functions os.get/set_inheritable(),
os.get/set_handle_inheritable() and socket.socket.get/set_inheritable().
2013-08-28 00:53:59 +02:00

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/*
* ossaudiodev -- Python interface to the OSS (Open Sound System) API.
* This is the standard audio API for Linux and some
* flavours of BSD [XXX which ones?]; it is also available
* for a wide range of commercial Unices.
*
* Originally written by Peter Bosch, March 2000, as linuxaudiodev.
*
* Renamed to ossaudiodev and rearranged/revised/hacked up
* by Greg Ward <gward@python.net>, November 2002.
* Mixer interface by Nicholas FitzRoy-Dale <wzdd@lardcave.net>, Dec 2002.
*
* (c) 2000 Peter Bosch. All Rights Reserved.
* (c) 2002 Gregory P. Ward. All Rights Reserved.
* (c) 2002 Python Software Foundation. All Rights Reserved.
*
* XXX need a license statement
*
* $Id$
*/
#include "Python.h"
#include "structmember.h"
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#else
#define O_RDONLY 00
#define O_WRONLY 01
#endif
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#if defined(linux)
#ifndef HAVE_STDINT_H
typedef unsigned long uint32_t;
#endif
#elif defined(__FreeBSD__)
# ifndef SNDCTL_DSP_CHANNELS
# define SNDCTL_DSP_CHANNELS SOUND_PCM_WRITE_CHANNELS
# endif
#endif
typedef struct {
PyObject_HEAD
char *devicename; /* name of the device file */
int fd; /* file descriptor */
int mode; /* file mode (O_RDONLY, etc.) */
int icount; /* input count */
int ocount; /* output count */
uint32_t afmts; /* audio formats supported by hardware */
} oss_audio_t;
typedef struct {
PyObject_HEAD
int fd; /* The open mixer device */
} oss_mixer_t;
static PyTypeObject OSSAudioType;
static PyTypeObject OSSMixerType;
static PyObject *OSSAudioError;
/* ----------------------------------------------------------------------
* DSP object initialization/deallocation
*/
static oss_audio_t *
newossobject(PyObject *arg)
{
oss_audio_t *self;
int fd, afmts, imode;
char *devicename = NULL;
char *mode = NULL;
/* Two ways to call open():
open(device, mode) (for consistency with builtin open())
open(mode) (for backwards compatibility)
because the *first* argument is optional, parsing args is
a wee bit tricky. */
if (!PyArg_ParseTuple(arg, "s|s:open", &devicename, &mode))
return NULL;
if (mode == NULL) { /* only one arg supplied */
mode = devicename;
devicename = NULL;
}
if (strcmp(mode, "r") == 0)
imode = O_RDONLY;
else if (strcmp(mode, "w") == 0)
imode = O_WRONLY;
else if (strcmp(mode, "rw") == 0)
imode = O_RDWR;
else {
PyErr_SetString(OSSAudioError, "mode must be 'r', 'w', or 'rw'");
return NULL;
}
/* Open the correct device: either the 'device' argument,
or the AUDIODEV environment variable, or "/dev/dsp". */
if (devicename == NULL) { /* called with one arg */
devicename = getenv("AUDIODEV");
if (devicename == NULL) /* $AUDIODEV not set */
devicename = "/dev/dsp";
}
/* Open with O_NONBLOCK to avoid hanging on devices that only allow
one open at a time. This does *not* affect later I/O; OSS
provides a special ioctl() for non-blocking read/write, which is
exposed via oss_nonblock() below. */
fd = _Py_open(devicename, imode|O_NONBLOCK);
if (fd == -1) {
PyErr_SetFromErrnoWithFilename(PyExc_IOError, devicename);
return NULL;
}
/* And (try to) put it back in blocking mode so we get the
expected write() semantics. */
if (fcntl(fd, F_SETFL, 0) == -1) {
close(fd);
PyErr_SetFromErrnoWithFilename(PyExc_IOError, devicename);
return NULL;
}
if (ioctl(fd, SNDCTL_DSP_GETFMTS, &afmts) == -1) {
close(fd);
PyErr_SetFromErrnoWithFilename(PyExc_IOError, devicename);
return NULL;
}
/* Create and initialize the object */
if ((self = PyObject_New(oss_audio_t, &OSSAudioType)) == NULL) {
close(fd);
return NULL;
}
self->devicename = devicename;
self->fd = fd;
self->mode = imode;
self->icount = self->ocount = 0;
self->afmts = afmts;
return self;
}
static void
oss_dealloc(oss_audio_t *self)
{
/* if already closed, don't reclose it */
if (self->fd != -1)
close(self->fd);
PyObject_Del(self);
}
/* ----------------------------------------------------------------------
* Mixer object initialization/deallocation
*/
static oss_mixer_t *
newossmixerobject(PyObject *arg)
{
char *devicename = NULL;
int fd;
oss_mixer_t *self;
if (!PyArg_ParseTuple(arg, "|s", &devicename)) {
return NULL;
}
if (devicename == NULL) {
devicename = getenv("MIXERDEV");
if (devicename == NULL) /* MIXERDEV not set */
devicename = "/dev/mixer";
}
fd = _Py_open(devicename, O_RDWR);
if (fd == -1) {
PyErr_SetFromErrnoWithFilename(PyExc_IOError, devicename);
return NULL;
}
if ((self = PyObject_New(oss_mixer_t, &OSSMixerType)) == NULL) {
close(fd);
return NULL;
}
self->fd = fd;
return self;
}
static void
oss_mixer_dealloc(oss_mixer_t *self)
{
/* if already closed, don't reclose it */
if (self->fd != -1)
close(self->fd);
PyObject_Del(self);
}
/* Methods to wrap the OSS ioctls. The calling convention is pretty
simple:
nonblock() -> ioctl(fd, SNDCTL_DSP_NONBLOCK)
fmt = setfmt(fmt) -> ioctl(fd, SNDCTL_DSP_SETFMT, &fmt)
etc.
*/
/* ----------------------------------------------------------------------
* Helper functions
*/
/* Check if a given file descriptor is valid (i.e. hasn't been closed).
* If true, return 1. Otherwise, raise ValueError and return 0.
*/
static int _is_fd_valid(int fd)
{
/* the FD is set to -1 in oss_close()/oss_mixer_close() */
if (fd >= 0) {
return 1;
} else {
PyErr_SetString(PyExc_ValueError,
"Operation on closed OSS device.");
return 0;
}
}
/* _do_ioctl_1() is a private helper function used for the OSS ioctls --
SNDCTL_DSP_{SETFMT,CHANNELS,SPEED} -- that are called from C
like this:
ioctl(fd, SNDCTL_DSP_cmd, &arg)
where arg is the value to set, and on return the driver sets arg to
the value that was actually set. Mapping this to Python is obvious:
arg = dsp.xxx(arg)
*/
static PyObject *
_do_ioctl_1(int fd, PyObject *args, char *fname, int cmd)
{
char argfmt[33] = "i:";
int arg;
assert(strlen(fname) <= 30);
strncat(argfmt, fname, 30);
if (!PyArg_ParseTuple(args, argfmt, &arg))
return NULL;
if (ioctl(fd, cmd, &arg) == -1)
return PyErr_SetFromErrno(PyExc_IOError);
return PyLong_FromLong(arg);
}
/* _do_ioctl_1_internal() is a wrapper for ioctls that take no inputs
but return an output -- ie. we need to pass a pointer to a local C
variable so the driver can write its output there, but from Python
all we see is the return value. For example,
SOUND_MIXER_READ_DEVMASK returns a bitmask of available mixer
devices, but does not use the value of the parameter passed-in in any
way.
*/
static PyObject *
_do_ioctl_1_internal(int fd, PyObject *args, char *fname, int cmd)
{
char argfmt[32] = ":";
int arg = 0;
assert(strlen(fname) <= 30);
strncat(argfmt, fname, 30);
if (!PyArg_ParseTuple(args, argfmt, &arg))
return NULL;
if (ioctl(fd, cmd, &arg) == -1)
return PyErr_SetFromErrno(PyExc_IOError);
return PyLong_FromLong(arg);
}
/* _do_ioctl_0() is a private helper for the no-argument ioctls:
SNDCTL_DSP_{SYNC,RESET,POST}. */
static PyObject *
_do_ioctl_0(int fd, PyObject *args, char *fname, int cmd)
{
char argfmt[32] = ":";
int rv;
assert(strlen(fname) <= 30);
strncat(argfmt, fname, 30);
if (!PyArg_ParseTuple(args, argfmt))
return NULL;
/* According to hannu@opensound.com, all three of the ioctls that
use this function can block, so release the GIL. This is
especially important for SYNC, which can block for several
seconds. */
Py_BEGIN_ALLOW_THREADS
rv = ioctl(fd, cmd, 0);
Py_END_ALLOW_THREADS
if (rv == -1)
return PyErr_SetFromErrno(PyExc_IOError);
Py_INCREF(Py_None);
return Py_None;
}
/* ----------------------------------------------------------------------
* Methods of DSP objects (OSSAudioType)
*/
static PyObject *
oss_nonblock(oss_audio_t *self, PyObject *unused)
{
if (!_is_fd_valid(self->fd))
return NULL;
/* Hmmm: it doesn't appear to be possible to return to blocking
mode once we're in non-blocking mode! */
if (ioctl(self->fd, SNDCTL_DSP_NONBLOCK, NULL) == -1)
return PyErr_SetFromErrno(PyExc_IOError);
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
oss_setfmt(oss_audio_t *self, PyObject *args)
{
if (!_is_fd_valid(self->fd))
return NULL;
return _do_ioctl_1(self->fd, args, "setfmt", SNDCTL_DSP_SETFMT);
}
static PyObject *
oss_getfmts(oss_audio_t *self, PyObject *unused)
{
int mask;
if (!_is_fd_valid(self->fd))
return NULL;
if (ioctl(self->fd, SNDCTL_DSP_GETFMTS, &mask) == -1)
return PyErr_SetFromErrno(PyExc_IOError);
return PyLong_FromLong(mask);
}
static PyObject *
oss_channels(oss_audio_t *self, PyObject *args)
{
if (!_is_fd_valid(self->fd))
return NULL;
return _do_ioctl_1(self->fd, args, "channels", SNDCTL_DSP_CHANNELS);
}
static PyObject *
oss_speed(oss_audio_t *self, PyObject *args)
{
if (!_is_fd_valid(self->fd))
return NULL;
return _do_ioctl_1(self->fd, args, "speed", SNDCTL_DSP_SPEED);
}
static PyObject *
oss_sync(oss_audio_t *self, PyObject *args)
{
if (!_is_fd_valid(self->fd))
return NULL;
return _do_ioctl_0(self->fd, args, "sync", SNDCTL_DSP_SYNC);
}
static PyObject *
oss_reset(oss_audio_t *self, PyObject *args)
{
if (!_is_fd_valid(self->fd))
return NULL;
return _do_ioctl_0(self->fd, args, "reset", SNDCTL_DSP_RESET);
}
static PyObject *
oss_post(oss_audio_t *self, PyObject *args)
{
if (!_is_fd_valid(self->fd))
return NULL;
return _do_ioctl_0(self->fd, args, "post", SNDCTL_DSP_POST);
}
/* Regular file methods: read(), write(), close(), etc. as well
as one convenience method, writeall(). */
static PyObject *
oss_read(oss_audio_t *self, PyObject *args)
{
int size, count;
char *cp;
PyObject *rv;
if (!_is_fd_valid(self->fd))
return NULL;
if (!PyArg_ParseTuple(args, "i:read", &size))
return NULL;
rv = PyBytes_FromStringAndSize(NULL, size);
if (rv == NULL)
return NULL;
cp = PyBytes_AS_STRING(rv);
Py_BEGIN_ALLOW_THREADS
count = read(self->fd, cp, size);
Py_END_ALLOW_THREADS
if (count < 0) {
PyErr_SetFromErrno(PyExc_IOError);
Py_DECREF(rv);
return NULL;
}
self->icount += count;
_PyBytes_Resize(&rv, count);
return rv;
}
static PyObject *
oss_write(oss_audio_t *self, PyObject *args)
{
char *cp;
int rv, size;
if (!_is_fd_valid(self->fd))
return NULL;
if (!PyArg_ParseTuple(args, "y#:write", &cp, &size)) {
return NULL;
}
Py_BEGIN_ALLOW_THREADS
rv = write(self->fd, cp, size);
Py_END_ALLOW_THREADS
if (rv == -1) {
return PyErr_SetFromErrno(PyExc_IOError);
} else {
self->ocount += rv;
}
return PyLong_FromLong(rv);
}
static PyObject *
oss_writeall(oss_audio_t *self, PyObject *args)
{
char *cp;
int rv, size;
fd_set write_set_fds;
int select_rv;
/* NB. writeall() is only useful in non-blocking mode: according to
Guenter Geiger <geiger@xdv.org> on the linux-audio-dev list
(http://eca.cx/lad/2002/11/0380.html), OSS guarantees that
write() in blocking mode consumes the whole buffer. In blocking
mode, the behaviour of write() and writeall() from Python is
indistinguishable. */
if (!_is_fd_valid(self->fd))
return NULL;
if (!PyArg_ParseTuple(args, "y#:write", &cp, &size))
return NULL;
if (!_PyIsSelectable_fd(self->fd)) {
PyErr_SetString(PyExc_ValueError,
"file descriptor out of range for select");
return NULL;
}
/* use select to wait for audio device to be available */
FD_ZERO(&write_set_fds);
FD_SET(self->fd, &write_set_fds);
while (size > 0) {
Py_BEGIN_ALLOW_THREADS
select_rv = select(self->fd+1, NULL, &write_set_fds, NULL, NULL);
Py_END_ALLOW_THREADS
assert(select_rv != 0); /* no timeout, can't expire */
if (select_rv == -1)
return PyErr_SetFromErrno(PyExc_IOError);
Py_BEGIN_ALLOW_THREADS
rv = write(self->fd, cp, size);
Py_END_ALLOW_THREADS
if (rv == -1) {
if (errno == EAGAIN) { /* buffer is full, try again */
errno = 0;
continue;
} else /* it's a real error */
return PyErr_SetFromErrno(PyExc_IOError);
} else { /* wrote rv bytes */
self->ocount += rv;
size -= rv;
cp += rv;
}
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
oss_close(oss_audio_t *self, PyObject *unused)
{
if (self->fd >= 0) {
Py_BEGIN_ALLOW_THREADS
close(self->fd);
Py_END_ALLOW_THREADS
self->fd = -1;
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
oss_self(PyObject *self, PyObject *unused)
{
Py_INCREF(self);
return self;
}
static PyObject *
oss_exit(PyObject *self, PyObject *unused)
{
_Py_IDENTIFIER(close);
PyObject *ret = _PyObject_CallMethodId(self, &PyId_close, NULL);
if (!ret)
return NULL;
Py_DECREF(ret);
Py_RETURN_NONE;
}
static PyObject *
oss_fileno(oss_audio_t *self, PyObject *unused)
{
if (!_is_fd_valid(self->fd))
return NULL;
return PyLong_FromLong(self->fd);
}
/* Convenience methods: these generally wrap a couple of ioctls into one
common task. */
static PyObject *
oss_setparameters(oss_audio_t *self, PyObject *args)
{
int wanted_fmt, wanted_channels, wanted_rate, strict=0;
int fmt, channels, rate;
PyObject * rv; /* return tuple (fmt, channels, rate) */
if (!_is_fd_valid(self->fd))
return NULL;
if (!PyArg_ParseTuple(args, "iii|i:setparameters",
&wanted_fmt, &wanted_channels, &wanted_rate,
&strict))
return NULL;
fmt = wanted_fmt;
if (ioctl(self->fd, SNDCTL_DSP_SETFMT, &fmt) == -1) {
return PyErr_SetFromErrno(PyExc_IOError);
}
if (strict && fmt != wanted_fmt) {
return PyErr_Format
(OSSAudioError,
"unable to set requested format (wanted %d, got %d)",
wanted_fmt, fmt);
}
channels = wanted_channels;
if (ioctl(self->fd, SNDCTL_DSP_CHANNELS, &channels) == -1) {
return PyErr_SetFromErrno(PyExc_IOError);
}
if (strict && channels != wanted_channels) {
return PyErr_Format
(OSSAudioError,
"unable to set requested channels (wanted %d, got %d)",
wanted_channels, channels);
}
rate = wanted_rate;
if (ioctl(self->fd, SNDCTL_DSP_SPEED, &rate) == -1) {
return PyErr_SetFromErrno(PyExc_IOError);
}
if (strict && rate != wanted_rate) {
return PyErr_Format
(OSSAudioError,
"unable to set requested rate (wanted %d, got %d)",
wanted_rate, rate);
}
/* Construct the return value: a (fmt, channels, rate) tuple that
tells what the audio hardware was actually set to. */
rv = PyTuple_New(3);
if (rv == NULL)
return NULL;
PyTuple_SET_ITEM(rv, 0, PyLong_FromLong(fmt));
PyTuple_SET_ITEM(rv, 1, PyLong_FromLong(channels));
PyTuple_SET_ITEM(rv, 2, PyLong_FromLong(rate));
return rv;
}
static int
_ssize(oss_audio_t *self, int *nchannels, int *ssize)
{
int fmt;
fmt = 0;
if (ioctl(self->fd, SNDCTL_DSP_SETFMT, &fmt) < 0)
return -errno;
switch (fmt) {
case AFMT_MU_LAW:
case AFMT_A_LAW:
case AFMT_U8:
case AFMT_S8:
*ssize = 1; /* 8 bit formats: 1 byte */
break;
case AFMT_S16_LE:
case AFMT_S16_BE:
case AFMT_U16_LE:
case AFMT_U16_BE:
*ssize = 2; /* 16 bit formats: 2 byte */
break;
case AFMT_MPEG:
case AFMT_IMA_ADPCM:
default:
return -EOPNOTSUPP;
}
if (ioctl(self->fd, SNDCTL_DSP_CHANNELS, nchannels) < 0)
return -errno;
return 0;
}
/* bufsize returns the size of the hardware audio buffer in number
of samples */
static PyObject *
oss_bufsize(oss_audio_t *self, PyObject *unused)
{
audio_buf_info ai;
int nchannels=0, ssize=0;
if (!_is_fd_valid(self->fd))
return NULL;
if (_ssize(self, &nchannels, &ssize) < 0 || !nchannels || !ssize) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
if (ioctl(self->fd, SNDCTL_DSP_GETOSPACE, &ai) < 0) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
return PyLong_FromLong((ai.fragstotal * ai.fragsize) / (nchannels * ssize));
}
/* obufcount returns the number of samples that are available in the
hardware for playing */
static PyObject *
oss_obufcount(oss_audio_t *self, PyObject *unused)
{
audio_buf_info ai;
int nchannels=0, ssize=0;
if (!_is_fd_valid(self->fd))
return NULL;
if (_ssize(self, &nchannels, &ssize) < 0 || !nchannels || !ssize) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
if (ioctl(self->fd, SNDCTL_DSP_GETOSPACE, &ai) < 0) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
return PyLong_FromLong((ai.fragstotal * ai.fragsize - ai.bytes) /
(ssize * nchannels));
}
/* obufcount returns the number of samples that can be played without
blocking */
static PyObject *
oss_obuffree(oss_audio_t *self, PyObject *unused)
{
audio_buf_info ai;
int nchannels=0, ssize=0;
if (!_is_fd_valid(self->fd))
return NULL;
if (_ssize(self, &nchannels, &ssize) < 0 || !nchannels || !ssize) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
if (ioctl(self->fd, SNDCTL_DSP_GETOSPACE, &ai) < 0) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
return PyLong_FromLong(ai.bytes / (ssize * nchannels));
}
static PyObject *
oss_getptr(oss_audio_t *self, PyObject *unused)
{
count_info info;
int req;
if (!_is_fd_valid(self->fd))
return NULL;
if (self->mode == O_RDONLY)
req = SNDCTL_DSP_GETIPTR;
else
req = SNDCTL_DSP_GETOPTR;
if (ioctl(self->fd, req, &info) == -1) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
return Py_BuildValue("iii", info.bytes, info.blocks, info.ptr);
}
/* ----------------------------------------------------------------------
* Methods of mixer objects (OSSMixerType)
*/
static PyObject *
oss_mixer_close(oss_mixer_t *self, PyObject *unused)
{
if (self->fd >= 0) {
close(self->fd);
self->fd = -1;
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
oss_mixer_fileno(oss_mixer_t *self, PyObject *unused)
{
if (!_is_fd_valid(self->fd))
return NULL;
return PyLong_FromLong(self->fd);
}
/* Simple mixer interface methods */
static PyObject *
oss_mixer_controls(oss_mixer_t *self, PyObject *args)
{
if (!_is_fd_valid(self->fd))
return NULL;
return _do_ioctl_1_internal(self->fd, args, "controls",
SOUND_MIXER_READ_DEVMASK);
}
static PyObject *
oss_mixer_stereocontrols(oss_mixer_t *self, PyObject *args)
{
if (!_is_fd_valid(self->fd))
return NULL;
return _do_ioctl_1_internal(self->fd, args, "stereocontrols",
SOUND_MIXER_READ_STEREODEVS);
}
static PyObject *
oss_mixer_reccontrols(oss_mixer_t *self, PyObject *args)
{
if (!_is_fd_valid(self->fd))
return NULL;
return _do_ioctl_1_internal(self->fd, args, "reccontrols",
SOUND_MIXER_READ_RECMASK);
}
static PyObject *
oss_mixer_get(oss_mixer_t *self, PyObject *args)
{
int channel, volume;
if (!_is_fd_valid(self->fd))
return NULL;
/* Can't use _do_ioctl_1 because of encoded arg thingy. */
if (!PyArg_ParseTuple(args, "i:get", &channel))
return NULL;
if (channel < 0 || channel > SOUND_MIXER_NRDEVICES) {
PyErr_SetString(OSSAudioError, "Invalid mixer channel specified.");
return NULL;
}
if (ioctl(self->fd, MIXER_READ(channel), &volume) == -1)
return PyErr_SetFromErrno(PyExc_IOError);
return Py_BuildValue("(ii)", volume & 0xff, (volume & 0xff00) >> 8);
}
static PyObject *
oss_mixer_set(oss_mixer_t *self, PyObject *args)
{
int channel, volume, leftVol, rightVol;
if (!_is_fd_valid(self->fd))
return NULL;
/* Can't use _do_ioctl_1 because of encoded arg thingy. */
if (!PyArg_ParseTuple(args, "i(ii):set", &channel, &leftVol, &rightVol))
return NULL;
if (channel < 0 || channel > SOUND_MIXER_NRDEVICES) {
PyErr_SetString(OSSAudioError, "Invalid mixer channel specified.");
return NULL;
}
if (leftVol < 0 || rightVol < 0 || leftVol > 100 || rightVol > 100) {
PyErr_SetString(OSSAudioError, "Volumes must be between 0 and 100.");
return NULL;
}
volume = (rightVol << 8) | leftVol;
if (ioctl(self->fd, MIXER_WRITE(channel), &volume) == -1)
return PyErr_SetFromErrno(PyExc_IOError);
return Py_BuildValue("(ii)", volume & 0xff, (volume & 0xff00) >> 8);
}
static PyObject *
oss_mixer_get_recsrc(oss_mixer_t *self, PyObject *args)
{
if (!_is_fd_valid(self->fd))
return NULL;
return _do_ioctl_1_internal(self->fd, args, "get_recsrc",
SOUND_MIXER_READ_RECSRC);
}
static PyObject *
oss_mixer_set_recsrc(oss_mixer_t *self, PyObject *args)
{
if (!_is_fd_valid(self->fd))
return NULL;
return _do_ioctl_1(self->fd, args, "set_recsrc",
SOUND_MIXER_WRITE_RECSRC);
}
/* ----------------------------------------------------------------------
* Method tables and other bureaucracy
*/
static PyMethodDef oss_methods[] = {
/* Regular file methods */
{ "read", (PyCFunction)oss_read, METH_VARARGS },
{ "write", (PyCFunction)oss_write, METH_VARARGS },
{ "writeall", (PyCFunction)oss_writeall, METH_VARARGS },
{ "close", (PyCFunction)oss_close, METH_NOARGS },
{ "fileno", (PyCFunction)oss_fileno, METH_NOARGS },
/* Simple ioctl wrappers */
{ "nonblock", (PyCFunction)oss_nonblock, METH_NOARGS },
{ "setfmt", (PyCFunction)oss_setfmt, METH_VARARGS },
{ "getfmts", (PyCFunction)oss_getfmts, METH_NOARGS },
{ "channels", (PyCFunction)oss_channels, METH_VARARGS },
{ "speed", (PyCFunction)oss_speed, METH_VARARGS },
{ "sync", (PyCFunction)oss_sync, METH_VARARGS },
{ "reset", (PyCFunction)oss_reset, METH_VARARGS },
{ "post", (PyCFunction)oss_post, METH_VARARGS },
/* Convenience methods -- wrap a couple of ioctls together */
{ "setparameters", (PyCFunction)oss_setparameters, METH_VARARGS },
{ "bufsize", (PyCFunction)oss_bufsize, METH_NOARGS },
{ "obufcount", (PyCFunction)oss_obufcount, METH_NOARGS },
{ "obuffree", (PyCFunction)oss_obuffree, METH_NOARGS },
{ "getptr", (PyCFunction)oss_getptr, METH_NOARGS },
/* Aliases for backwards compatibility */
{ "flush", (PyCFunction)oss_sync, METH_VARARGS },
/* Support for the context manager protocol */
{ "__enter__", oss_self, METH_NOARGS },
{ "__exit__", oss_exit, METH_VARARGS },
{ NULL, NULL} /* sentinel */
};
static PyMethodDef oss_mixer_methods[] = {
/* Regular file method - OSS mixers are ioctl-only interface */
{ "close", (PyCFunction)oss_mixer_close, METH_NOARGS },
{ "fileno", (PyCFunction)oss_mixer_fileno, METH_NOARGS },
/* Support for the context manager protocol */
{ "__enter__", oss_self, METH_NOARGS },
{ "__exit__", oss_exit, METH_VARARGS },
/* Simple ioctl wrappers */
{ "controls", (PyCFunction)oss_mixer_controls, METH_VARARGS },
{ "stereocontrols", (PyCFunction)oss_mixer_stereocontrols, METH_VARARGS},
{ "reccontrols", (PyCFunction)oss_mixer_reccontrols, METH_VARARGS},
{ "get", (PyCFunction)oss_mixer_get, METH_VARARGS },
{ "set", (PyCFunction)oss_mixer_set, METH_VARARGS },
{ "get_recsrc", (PyCFunction)oss_mixer_get_recsrc, METH_VARARGS },
{ "set_recsrc", (PyCFunction)oss_mixer_set_recsrc, METH_VARARGS },
{ NULL, NULL}
};
static PyObject *
oss_getattro(oss_audio_t *self, PyObject *nameobj)
{
char *name = "";
PyObject * rval = NULL;
if (PyUnicode_Check(nameobj))
name = _PyUnicode_AsString(nameobj);
if (strcmp(name, "closed") == 0) {
rval = (self->fd == -1) ? Py_True : Py_False;
Py_INCREF(rval);
}
else if (strcmp(name, "name") == 0) {
rval = PyUnicode_FromString(self->devicename);
}
else if (strcmp(name, "mode") == 0) {
/* No need for a "default" in this switch: from newossobject(),
self->mode can only be one of these three values. */
switch(self->mode) {
case O_RDONLY:
rval = PyUnicode_FromString("r");
break;
case O_RDWR:
rval = PyUnicode_FromString("rw");
break;
case O_WRONLY:
rval = PyUnicode_FromString("w");
break;
}
}
else {
rval = PyObject_GenericGetAttr((PyObject *)self, nameobj);
}
return rval;
}
static PyTypeObject OSSAudioType = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"ossaudiodev.oss_audio_device", /*tp_name*/
sizeof(oss_audio_t), /*tp_size*/
0, /*tp_itemsize*/
/* methods */
(destructor)oss_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_reserved*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash*/
0, /*tp_call*/
0, /*tp_str*/
(getattrofunc)oss_getattro, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT, /*tp_flags*/
0, /*tp_doc*/
0, /*tp_traverse*/
0, /*tp_clear*/
0, /*tp_richcompare*/
0, /*tp_weaklistoffset*/
0, /*tp_iter*/
0, /*tp_iternext*/
oss_methods, /*tp_methods*/
};
static PyTypeObject OSSMixerType = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"ossaudiodev.oss_mixer_device", /*tp_name*/
sizeof(oss_mixer_t), /*tp_size*/
0, /*tp_itemsize*/
/* methods */
(destructor)oss_mixer_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_reserved*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash*/
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT, /*tp_flags*/
0, /*tp_doc*/
0, /*tp_traverse*/
0, /*tp_clear*/
0, /*tp_richcompare*/
0, /*tp_weaklistoffset*/
0, /*tp_iter*/
0, /*tp_iternext*/
oss_mixer_methods, /*tp_methods*/
};
static PyObject *
ossopen(PyObject *self, PyObject *args)
{
return (PyObject *)newossobject(args);
}
static PyObject *
ossopenmixer(PyObject *self, PyObject *args)
{
return (PyObject *)newossmixerobject(args);
}
static PyMethodDef ossaudiodev_methods[] = {
{ "open", ossopen, METH_VARARGS },
{ "openmixer", ossopenmixer, METH_VARARGS },
{ 0, 0 },
};
#define _EXPORT_INT(mod, name) \
if (PyModule_AddIntConstant(mod, #name, (long) (name)) == -1) return NULL;
static char *control_labels[] = SOUND_DEVICE_LABELS;
static char *control_names[] = SOUND_DEVICE_NAMES;
static int
build_namelists (PyObject *module)
{
PyObject *labels;
PyObject *names;
PyObject *s;
int num_controls;
int i;
num_controls = Py_ARRAY_LENGTH(control_labels);
assert(num_controls == Py_ARRAY_LENGTH(control_names));
labels = PyList_New(num_controls);
names = PyList_New(num_controls);
if (labels == NULL || names == NULL)
goto error2;
for (i = 0; i < num_controls; i++) {
s = PyUnicode_FromString(control_labels[i]);
if (s == NULL)
goto error2;
PyList_SET_ITEM(labels, i, s);
s = PyUnicode_FromString(control_names[i]);
if (s == NULL)
goto error2;
PyList_SET_ITEM(names, i, s);
}
if (PyModule_AddObject(module, "control_labels", labels) == -1)
goto error2;
if (PyModule_AddObject(module, "control_names", names) == -1)
goto error1;
return 0;
error2:
Py_XDECREF(labels);
error1:
Py_XDECREF(names);
return -1;
}
static struct PyModuleDef ossaudiodevmodule = {
PyModuleDef_HEAD_INIT,
"ossaudiodev",
NULL,
-1,
ossaudiodev_methods,
NULL,
NULL,
NULL,
NULL
};
PyMODINIT_FUNC
PyInit_ossaudiodev(void)
{
PyObject *m;
if (PyType_Ready(&OSSAudioType) < 0)
return NULL;
if (PyType_Ready(&OSSMixerType) < 0)
return NULL;
m = PyModule_Create(&ossaudiodevmodule);
if (m == NULL)
return NULL;
OSSAudioError = PyErr_NewException("ossaudiodev.OSSAudioError",
NULL, NULL);
if (OSSAudioError) {
/* Each call to PyModule_AddObject decrefs it; compensate: */
Py_INCREF(OSSAudioError);
Py_INCREF(OSSAudioError);
PyModule_AddObject(m, "error", OSSAudioError);
PyModule_AddObject(m, "OSSAudioError", OSSAudioError);
}
/* Build 'control_labels' and 'control_names' lists and add them
to the module. */
if (build_namelists(m) == -1) /* XXX what to do here? */
return NULL;
/* Expose the audio format numbers -- essential! */
_EXPORT_INT(m, AFMT_QUERY);
_EXPORT_INT(m, AFMT_MU_LAW);
_EXPORT_INT(m, AFMT_A_LAW);
_EXPORT_INT(m, AFMT_IMA_ADPCM);
_EXPORT_INT(m, AFMT_U8);
_EXPORT_INT(m, AFMT_S16_LE);
_EXPORT_INT(m, AFMT_S16_BE);
_EXPORT_INT(m, AFMT_S8);
_EXPORT_INT(m, AFMT_U16_LE);
_EXPORT_INT(m, AFMT_U16_BE);
_EXPORT_INT(m, AFMT_MPEG);
#ifdef AFMT_AC3
_EXPORT_INT(m, AFMT_AC3);
#endif
#ifdef AFMT_S16_NE
_EXPORT_INT(m, AFMT_S16_NE);
#endif
#ifdef AFMT_U16_NE
_EXPORT_INT(m, AFMT_U16_NE);
#endif
#ifdef AFMT_S32_LE
_EXPORT_INT(m, AFMT_S32_LE);
#endif
#ifdef AFMT_S32_BE
_EXPORT_INT(m, AFMT_S32_BE);
#endif
#ifdef AFMT_MPEG
_EXPORT_INT(m, AFMT_MPEG);
#endif
/* Expose the sound mixer device numbers. */
_EXPORT_INT(m, SOUND_MIXER_NRDEVICES);
_EXPORT_INT(m, SOUND_MIXER_VOLUME);
_EXPORT_INT(m, SOUND_MIXER_BASS);
_EXPORT_INT(m, SOUND_MIXER_TREBLE);
_EXPORT_INT(m, SOUND_MIXER_SYNTH);
_EXPORT_INT(m, SOUND_MIXER_PCM);
_EXPORT_INT(m, SOUND_MIXER_SPEAKER);
_EXPORT_INT(m, SOUND_MIXER_LINE);
_EXPORT_INT(m, SOUND_MIXER_MIC);
_EXPORT_INT(m, SOUND_MIXER_CD);
_EXPORT_INT(m, SOUND_MIXER_IMIX);
_EXPORT_INT(m, SOUND_MIXER_ALTPCM);
_EXPORT_INT(m, SOUND_MIXER_RECLEV);
_EXPORT_INT(m, SOUND_MIXER_IGAIN);
_EXPORT_INT(m, SOUND_MIXER_OGAIN);
_EXPORT_INT(m, SOUND_MIXER_LINE1);
_EXPORT_INT(m, SOUND_MIXER_LINE2);
_EXPORT_INT(m, SOUND_MIXER_LINE3);
#ifdef SOUND_MIXER_DIGITAL1
_EXPORT_INT(m, SOUND_MIXER_DIGITAL1);
#endif
#ifdef SOUND_MIXER_DIGITAL2
_EXPORT_INT(m, SOUND_MIXER_DIGITAL2);
#endif
#ifdef SOUND_MIXER_DIGITAL3
_EXPORT_INT(m, SOUND_MIXER_DIGITAL3);
#endif
#ifdef SOUND_MIXER_PHONEIN
_EXPORT_INT(m, SOUND_MIXER_PHONEIN);
#endif
#ifdef SOUND_MIXER_PHONEOUT
_EXPORT_INT(m, SOUND_MIXER_PHONEOUT);
#endif
#ifdef SOUND_MIXER_VIDEO
_EXPORT_INT(m, SOUND_MIXER_VIDEO);
#endif
#ifdef SOUND_MIXER_RADIO
_EXPORT_INT(m, SOUND_MIXER_RADIO);
#endif
#ifdef SOUND_MIXER_MONITOR
_EXPORT_INT(m, SOUND_MIXER_MONITOR);
#endif
/* Expose all the ioctl numbers for masochists who like to do this
stuff directly. */
_EXPORT_INT(m, SNDCTL_COPR_HALT);
_EXPORT_INT(m, SNDCTL_COPR_LOAD);
_EXPORT_INT(m, SNDCTL_COPR_RCODE);
_EXPORT_INT(m, SNDCTL_COPR_RCVMSG);
_EXPORT_INT(m, SNDCTL_COPR_RDATA);
_EXPORT_INT(m, SNDCTL_COPR_RESET);
_EXPORT_INT(m, SNDCTL_COPR_RUN);
_EXPORT_INT(m, SNDCTL_COPR_SENDMSG);
_EXPORT_INT(m, SNDCTL_COPR_WCODE);
_EXPORT_INT(m, SNDCTL_COPR_WDATA);
#ifdef SNDCTL_DSP_BIND_CHANNEL
_EXPORT_INT(m, SNDCTL_DSP_BIND_CHANNEL);
#endif
_EXPORT_INT(m, SNDCTL_DSP_CHANNELS);
_EXPORT_INT(m, SNDCTL_DSP_GETBLKSIZE);
_EXPORT_INT(m, SNDCTL_DSP_GETCAPS);
#ifdef SNDCTL_DSP_GETCHANNELMASK
_EXPORT_INT(m, SNDCTL_DSP_GETCHANNELMASK);
#endif
_EXPORT_INT(m, SNDCTL_DSP_GETFMTS);
_EXPORT_INT(m, SNDCTL_DSP_GETIPTR);
_EXPORT_INT(m, SNDCTL_DSP_GETISPACE);
#ifdef SNDCTL_DSP_GETODELAY
_EXPORT_INT(m, SNDCTL_DSP_GETODELAY);
#endif
_EXPORT_INT(m, SNDCTL_DSP_GETOPTR);
_EXPORT_INT(m, SNDCTL_DSP_GETOSPACE);
#ifdef SNDCTL_DSP_GETSPDIF
_EXPORT_INT(m, SNDCTL_DSP_GETSPDIF);
#endif
_EXPORT_INT(m, SNDCTL_DSP_GETTRIGGER);
_EXPORT_INT(m, SNDCTL_DSP_MAPINBUF);
_EXPORT_INT(m, SNDCTL_DSP_MAPOUTBUF);
_EXPORT_INT(m, SNDCTL_DSP_NONBLOCK);
_EXPORT_INT(m, SNDCTL_DSP_POST);
#ifdef SNDCTL_DSP_PROFILE
_EXPORT_INT(m, SNDCTL_DSP_PROFILE);
#endif
_EXPORT_INT(m, SNDCTL_DSP_RESET);
_EXPORT_INT(m, SNDCTL_DSP_SAMPLESIZE);
_EXPORT_INT(m, SNDCTL_DSP_SETDUPLEX);
_EXPORT_INT(m, SNDCTL_DSP_SETFMT);
_EXPORT_INT(m, SNDCTL_DSP_SETFRAGMENT);
#ifdef SNDCTL_DSP_SETSPDIF
_EXPORT_INT(m, SNDCTL_DSP_SETSPDIF);
#endif
_EXPORT_INT(m, SNDCTL_DSP_SETSYNCRO);
_EXPORT_INT(m, SNDCTL_DSP_SETTRIGGER);
_EXPORT_INT(m, SNDCTL_DSP_SPEED);
_EXPORT_INT(m, SNDCTL_DSP_STEREO);
_EXPORT_INT(m, SNDCTL_DSP_SUBDIVIDE);
_EXPORT_INT(m, SNDCTL_DSP_SYNC);
_EXPORT_INT(m, SNDCTL_FM_4OP_ENABLE);
_EXPORT_INT(m, SNDCTL_FM_LOAD_INSTR);
_EXPORT_INT(m, SNDCTL_MIDI_INFO);
_EXPORT_INT(m, SNDCTL_MIDI_MPUCMD);
_EXPORT_INT(m, SNDCTL_MIDI_MPUMODE);
_EXPORT_INT(m, SNDCTL_MIDI_PRETIME);
_EXPORT_INT(m, SNDCTL_SEQ_CTRLRATE);
_EXPORT_INT(m, SNDCTL_SEQ_GETINCOUNT);
_EXPORT_INT(m, SNDCTL_SEQ_GETOUTCOUNT);
#ifdef SNDCTL_SEQ_GETTIME
_EXPORT_INT(m, SNDCTL_SEQ_GETTIME);
#endif
_EXPORT_INT(m, SNDCTL_SEQ_NRMIDIS);
_EXPORT_INT(m, SNDCTL_SEQ_NRSYNTHS);
_EXPORT_INT(m, SNDCTL_SEQ_OUTOFBAND);
_EXPORT_INT(m, SNDCTL_SEQ_PANIC);
_EXPORT_INT(m, SNDCTL_SEQ_PERCMODE);
_EXPORT_INT(m, SNDCTL_SEQ_RESET);
_EXPORT_INT(m, SNDCTL_SEQ_RESETSAMPLES);
_EXPORT_INT(m, SNDCTL_SEQ_SYNC);
_EXPORT_INT(m, SNDCTL_SEQ_TESTMIDI);
_EXPORT_INT(m, SNDCTL_SEQ_THRESHOLD);
#ifdef SNDCTL_SYNTH_CONTROL
_EXPORT_INT(m, SNDCTL_SYNTH_CONTROL);
#endif
#ifdef SNDCTL_SYNTH_ID
_EXPORT_INT(m, SNDCTL_SYNTH_ID);
#endif
_EXPORT_INT(m, SNDCTL_SYNTH_INFO);
_EXPORT_INT(m, SNDCTL_SYNTH_MEMAVL);
#ifdef SNDCTL_SYNTH_REMOVESAMPLE
_EXPORT_INT(m, SNDCTL_SYNTH_REMOVESAMPLE);
#endif
_EXPORT_INT(m, SNDCTL_TMR_CONTINUE);
_EXPORT_INT(m, SNDCTL_TMR_METRONOME);
_EXPORT_INT(m, SNDCTL_TMR_SELECT);
_EXPORT_INT(m, SNDCTL_TMR_SOURCE);
_EXPORT_INT(m, SNDCTL_TMR_START);
_EXPORT_INT(m, SNDCTL_TMR_STOP);
_EXPORT_INT(m, SNDCTL_TMR_TEMPO);
_EXPORT_INT(m, SNDCTL_TMR_TIMEBASE);
return m;
}
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