cpython/Modules/ossaudiodev.c at master · python-emscripten/cpython · GitHub

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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.

* $Id$

#define PY_SSIZE_T_CLEAN

#include "Python.h"

#include "structmember.h" // PyMemberDef

#ifdef HAVE_FCNTL_H

#include <fcntl.h>

#else

#define O_RDONLY 00

#define O_WRONLY 01

#endif

#include <sys/ioctl.h>

#ifdef __ANDROID__

#include <linux/soundcard.h>

#else

#include <sys/soundcard.h>

#endif

#ifdef __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

const char *devicename; /* name of the device file */

int fd; /* file descriptor */

int mode; /* file mode (O_RDONLY, etc.) */

Py_ssize_t icount; /* input count */

Py_ssize_t 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;

const char *devicename = NULL;

const 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)

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_OSError, devicename);

return NULL;

}

if (ioctl(fd, SNDCTL_DSP_GETFMTS, &afmts) == -1) {

close(fd);

PyErr_SetFromErrnoWithFilename(PyExc_OSError, 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)

{

const 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)

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, unsigned long 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_OSError);

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, unsigned long 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_OSError);

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, unsigned long 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_OSError);

Py_RETURN_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_OSError);

Py_RETURN_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_OSError);

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)

{

Py_ssize_t size, count;

PyObject *rv;

if (!_is_fd_valid(self->fd))

return NULL;

if (!PyArg_ParseTuple(args, "n:read", &size))

return NULL;

rv = PyBytes_FromStringAndSize(NULL, size);

if (rv == NULL)

return NULL;

count = _Py_read(self->fd, PyBytes_AS_STRING(rv), size);

if (count == -1) {

Py_DECREF(rv);

return NULL;

}

self->icount += count;

_PyBytes_Resize(&rv, count);

return rv;

}

static PyObject *

oss_write(oss_audio_t *self, PyObject *args)

{

Py_buffer data;

Py_ssize_t rv;

if (!_is_fd_valid(self->fd))

return NULL;

if (!PyArg_ParseTuple(args, "y*:write", &data)) {

return NULL;

}

rv = _Py_write(self->fd, data.buf, data.len);

PyBuffer_Release(&data);

if (rv == -1)

return NULL;

self->ocount += rv;

return PyLong_FromLong(rv);

}

static PyObject *

oss_writeall(oss_audio_t *self, PyObject *args)

{

Py_buffer data;

const char *cp;

Py_ssize_t size;

Py_ssize_t rv;

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*:writeall", &data))

return NULL;

if (!_PyIsSelectable_fd(self->fd)) {

PyErr_SetString(PyExc_ValueError,

"file descriptor out of range for select");

PyBuffer_Release(&data);

return NULL;

}

/* use select to wait for audio device to be available */

FD_ZERO(&write_set_fds);

FD_SET(self->fd, &write_set_fds);

cp = (const char *)data.buf;

size = data.len;

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) {

PyBuffer_Release(&data);

return PyErr_SetFromErrno(PyExc_OSError);

}

rv = _Py_write(self->fd, cp, Py_MIN(size, INT_MAX));

if (rv == -1) {

/* buffer is full, try again */

if (errno == EAGAIN) {

PyErr_Clear();

continue;

}

/* it's a real error */

PyBuffer_Release(&data);

return NULL;

}

/* wrote rv bytes */

self->ocount += rv;

size -= rv;

cp += rv;

}

PyBuffer_Release(&data);

Py_RETURN_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_RETURN_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_CallMethodIdNoArgs(self, &PyId_close);

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;

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_OSError);

}

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_OSError);

}

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_OSError);

}

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. */

return Py_BuildValue("(iii)", fmt, channels, rate);

}

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_OSError);

return NULL;

}

if (ioctl(self->fd, SNDCTL_DSP_GETOSPACE, &ai) < 0) {

PyErr_SetFromErrno(PyExc_OSError);

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_OSError);

return NULL;

}

if (ioctl(self->fd, SNDCTL_DSP_GETOSPACE, &ai) < 0) {

PyErr_SetFromErrno(PyExc_OSError);

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_OSError);

return NULL;

}

if (ioctl(self->fd, SNDCTL_DSP_GETOSPACE, &ai) < 0) {

PyErr_SetFromErrno(PyExc_OSError);

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_OSError);

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_RETURN_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_OSError);

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_OSError);

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 management 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 management 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 PyMemberDef oss_members[] = {

{"name", T_STRING, offsetof(oss_audio_t, devicename), READONLY, NULL},

{NULL}

};

static PyObject *

oss_closed_getter(oss_audio_t *self, void *closure)

{

return PyBool_FromLong(self->fd == -1);

}

static PyObject *

oss_mode_getter(oss_audio_t *self, void *closure)

{

switch(self->mode) {

case O_RDONLY:

return PyUnicode_FromString("r");

break;

case O_RDWR:

return PyUnicode_FromString("rw");

break;

case O_WRONLY:

return PyUnicode_FromString("w");

break;

default:

/* From newossobject(), self->mode can only be one

of these three values. */

Py_UNREACHABLE();

}

static PyGetSetDef oss_getsetlist[] = {

{"closed", (getter)oss_closed_getter, (setter)NULL, NULL},

{"mode", (getter)oss_mode_getter, (setter)NULL, NULL},

{NULL},

};

static PyTypeObject OSSAudioType = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"ossaudiodev.oss_audio_device", /*tp_name*/

sizeof(oss_audio_t), /*tp_basicsize*/

0, /*tp_itemsize*/

/* methods */

(destructor)oss_dealloc, /*tp_dealloc*/

0, /*tp_vectorcall_offset*/

0, /*tp_getattr*/

0, /*tp_setattr*/

0, /*tp_as_async*/

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_methods, /*tp_methods*/

oss_members, /*tp_members*/

oss_getsetlist, /*tp_getset*/

};

static PyTypeObject OSSMixerType = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"ossaudiodev.oss_mixer_device", /*tp_name*/

sizeof(oss_mixer_t), /*tp_basicsize*/

0, /*tp_itemsize*/

/* methods */

(destructor)oss_mixer_dealloc, /*tp_dealloc*/

0, /*tp_vectorcall_offset*/

View remainder of file in raw view

cpython/Modules/ossaudiodev.c at master · python-emscripten/cpython · GitHub

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