cpython/Modules/linuxaudiodev.c at 2.7 · python-emscripten/cpython · GitHub

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/* Hey Emacs, this is -*-C-*-

******************************************************************************

* linuxaudiodev.c -- Linux audio device for python.

* Author : Peter Bosch

* Created On : Thu Mar 2 21:10:33 2000

* Status : Unknown, Use with caution!

* Unless other notices are present in any part of this file

* explicitly claiming copyrights for other people and/or

* organizations, the contents of this file is fully copyright

******************************************************************************

#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>

#if defined(linux)

#include <linux/soundcard.h>

#ifndef HAVE_STDINT_H

typedef unsigned long uint32_t;

#endif

#elif defined(__FreeBSD__)

#include <machine/soundcard.h>

#ifndef SNDCTL_DSP_CHANNELS

#define SNDCTL_DSP_CHANNELS SOUND_PCM_WRITE_CHANNELS

#endif

typedef struct {

PyObject_HEAD

int x_fd; /* The open file */

int x_mode; /* file mode */

int x_icount; /* Input count */

int x_ocount; /* Output count */

uint32_t x_afmts; /* Audio formats supported by hardware*/

} lad_t;

/* XXX several format defined in soundcard.h are not supported,

including _NE (native endian) options and S32 options

static struct {

int a_bps;

uint32_t a_fmt;

char *a_name;

} audio_types[] = {

{ 8, AFMT_MU_LAW, "logarithmic mu-law 8-bit audio" },

{ 8, AFMT_A_LAW, "logarithmic A-law 8-bit audio" },

{ 8, AFMT_U8, "linear unsigned 8-bit audio" },

{ 8, AFMT_S8, "linear signed 8-bit audio" },

{ 16, AFMT_U16_BE, "linear unsigned 16-bit big-endian audio" },

{ 16, AFMT_U16_LE, "linear unsigned 16-bit little-endian audio" },

{ 16, AFMT_S16_BE, "linear signed 16-bit big-endian audio" },

{ 16, AFMT_S16_LE, "linear signed 16-bit little-endian audio" },

{ 16, AFMT_S16_NE, "linear signed 16-bit native-endian audio" },

};

static int n_audio_types = sizeof(audio_types) / sizeof(audio_types[0]);

static PyTypeObject Ladtype;

static PyObject *LinuxAudioError;

static lad_t *

newladobject(PyObject *arg)

{

lad_t *xp;

int fd, afmts, imode;

char *basedev = NULL;

char *mode = NULL;

/* Two ways to call linuxaudiodev.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", &basedev, &mode))

return NULL;

if (mode == NULL) { /* only one arg supplied */

mode = basedev;

basedev = NULL;

}

if (strcmp(mode, "r") == 0)

imode = O_RDONLY;

else if (strcmp(mode, "w") == 0)

imode = O_WRONLY;

else {

PyErr_SetString(LinuxAudioError, "mode should be 'r' or 'w'");

return NULL;

}

/* Open the correct device. The base device name comes from the

* AUDIODEV environment variable first, then /dev/dsp. The

* control device tacks "ctl" onto the base device name.

* Note that the only difference between /dev/audio and /dev/dsp

* is that the former uses logarithmic mu-law encoding and the

* latter uses 8-bit unsigned encoding.

if (basedev == NULL) { /* called with one arg */

basedev = getenv("AUDIODEV");

if (basedev == NULL) /* $AUDIODEV not set */

basedev = "/dev/dsp";

}

if ((fd = open(basedev, imode)) == -1) {

PyErr_SetFromErrnoWithFilename(LinuxAudioError, basedev);

return NULL;

}

if (imode == O_WRONLY && ioctl(fd, SNDCTL_DSP_NONBLOCK, NULL) == -1) {

PyErr_SetFromErrnoWithFilename(LinuxAudioError, basedev);

close(fd);

return NULL;

}

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

PyErr_SetFromErrnoWithFilename(LinuxAudioError, basedev);

close(fd);

return NULL;

}

/* Create and initialize the object */

if ((xp = PyObject_New(lad_t, &Ladtype)) == NULL) {

close(fd);

return NULL;

}

xp->x_fd = fd;

xp->x_mode = imode;

xp->x_icount = xp->x_ocount = 0;

xp->x_afmts = afmts;

return xp;

}

static void

lad_dealloc(lad_t *xp)

{

/* if already closed, don't reclose it */

if (xp->x_fd != -1)

close(xp->x_fd);

PyObject_Del(xp);

}

static PyObject *

lad_read(lad_t *self, PyObject *args)

{

int size, count;

char *cp;

PyObject *rv;

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

return NULL;

rv = PyString_FromStringAndSize(NULL, size);

if (rv == NULL)

return NULL;

cp = PyString_AS_STRING(rv);

if ((count = read(self->x_fd, cp, size)) < 0) {

PyErr_SetFromErrno(LinuxAudioError);

Py_DECREF(rv);

return NULL;

}

self->x_icount += count;

_PyString_Resize(&rv, count);

return rv;

}

static PyObject *

lad_write(lad_t *self, PyObject *args)

{

char *cp;

int rv, size;

fd_set write_set_fds;

struct timeval tv;

int select_retval;

if (!PyArg_ParseTuple(args, "s#:write", &cp, &size))

return NULL;

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

FD_ZERO(&write_set_fds);

FD_SET(self->x_fd, &write_set_fds);

tv.tv_sec = 4; /* timeout values */

tv.tv_usec = 0;

while (size > 0) {

select_retval = select(self->x_fd+1, NULL, &write_set_fds, NULL, &tv);

tv.tv_sec = 1; tv.tv_usec = 0; /* willing to wait this long next time*/

if (select_retval) {

if ((rv = write(self->x_fd, cp, size)) == -1) {

if (errno != EAGAIN) {

PyErr_SetFromErrno(LinuxAudioError);

return NULL;

} else {

errno = 0; /* EAGAIN: buffer is full, try again */

}

} else {

self->x_ocount += rv;

size -= rv;

cp += rv;

}

} else {

/* printf("Not able to write to linux audio device within %ld seconds\n", tv.tv_sec); */

PyErr_SetFromErrno(LinuxAudioError);

return NULL;

}

Py_INCREF(Py_None);

return Py_None;

}

static PyObject *

lad_close(lad_t *self, PyObject *unused)

{

if (self->x_fd >= 0) {

close(self->x_fd);

self->x_fd = -1;

}

Py_RETURN_NONE;

}

static PyObject *

lad_fileno(lad_t *self, PyObject *unused)

{

return PyInt_FromLong(self->x_fd);

}

static PyObject *

lad_setparameters(lad_t *self, PyObject *args)

{

int rate, ssize, nchannels, n, fmt, emulate=0;

if (!PyArg_ParseTuple(args, "iiii|i:setparameters",

&rate, &ssize, &nchannels, &fmt, &emulate))

return NULL;

if (rate < 0) {

PyErr_Format(PyExc_ValueError, "expected rate >= 0, not %d",

rate);

return NULL;

}

if (ssize < 0) {

PyErr_Format(PyExc_ValueError, "expected sample size >= 0, not %d",

ssize);

return NULL;

}

if (nchannels != 1 && nchannels != 2) {

PyErr_Format(PyExc_ValueError, "nchannels must be 1 or 2, not %d",

nchannels);

return NULL;

}

for (n = 0; n < n_audio_types; n++)

if (fmt == audio_types[n].a_fmt)

break;

if (n == n_audio_types) {

PyErr_Format(PyExc_ValueError, "unknown audio encoding: %d", fmt);

return NULL;

}

if (audio_types[n].a_bps != ssize) {

PyErr_Format(PyExc_ValueError,

"for %s, expected sample size %d, not %d",

audio_types[n].a_name, audio_types[n].a_bps, ssize);

return NULL;

}

if (emulate == 0) {

if ((self->x_afmts & audio_types[n].a_fmt) == 0) {

PyErr_Format(PyExc_ValueError,

"%s format not supported by device",

audio_types[n].a_name);

return NULL;

}

if (ioctl(self->x_fd, SNDCTL_DSP_SETFMT,

&audio_types[n].a_fmt) == -1) {

PyErr_SetFromErrno(LinuxAudioError);

return NULL;

}

if (ioctl(self->x_fd, SNDCTL_DSP_CHANNELS, &nchannels) == -1) {

PyErr_SetFromErrno(LinuxAudioError);

return NULL;

}

if (ioctl(self->x_fd, SNDCTL_DSP_SPEED, &rate) == -1) {

PyErr_SetFromErrno(LinuxAudioError);

return NULL;

}

Py_INCREF(Py_None);

return Py_None;

}

static int

_ssize(lad_t *self, int *nchannels, int *ssize)

{

int fmt;

fmt = 0;

if (ioctl(self->x_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 = sizeof(char);

break;

case AFMT_S16_LE:

case AFMT_S16_BE:

case AFMT_U16_LE:

case AFMT_U16_BE:

*ssize = sizeof(short);

break;

case AFMT_MPEG:

case AFMT_IMA_ADPCM:

default:

return -EOPNOTSUPP;

}

if (ioctl(self->x_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 *

lad_bufsize(lad_t *self, PyObject *unused)

{

audio_buf_info ai;

int nchannels=0, ssize=0;

if (_ssize(self, &nchannels, &ssize) < 0 || !ssize || !nchannels) {

PyErr_SetFromErrno(LinuxAudioError);

return NULL;

}

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

PyErr_SetFromErrno(LinuxAudioError);

return NULL;

}

return PyInt_FromLong((ai.fragstotal * ai.fragsize) / (nchannels * ssize));

}

/* obufcount returns the number of samples that are available in the

hardware for playing */

static PyObject *

lad_obufcount(lad_t *self, PyObject *unused)

{

audio_buf_info ai;

int nchannels=0, ssize=0;

if (_ssize(self, &nchannels, &ssize) < 0 || !ssize || !nchannels) {

PyErr_SetFromErrno(LinuxAudioError);

return NULL;

}

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

PyErr_SetFromErrno(LinuxAudioError);

return NULL;

}

return PyInt_FromLong((ai.fragstotal * ai.fragsize - ai.bytes) /

(ssize * nchannels));

}

/* obufcount returns the number of samples that can be played without

blocking */

static PyObject *

lad_obuffree(lad_t *self, PyObject *unused)

{

audio_buf_info ai;

int nchannels=0, ssize=0;

if (_ssize(self, &nchannels, &ssize) < 0 || !ssize || !nchannels) {

PyErr_SetFromErrno(LinuxAudioError);

return NULL;

}

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

PyErr_SetFromErrno(LinuxAudioError);

return NULL;

}

return PyInt_FromLong(ai.bytes / (ssize * nchannels));

}

/* Flush the device */

static PyObject *

lad_flush(lad_t *self, PyObject *unused)

{

if (ioctl(self->x_fd, SNDCTL_DSP_SYNC, NULL) == -1) {

PyErr_SetFromErrno(LinuxAudioError);

return NULL;

}

Py_RETURN_NONE;

}

static PyObject *

lad_getptr(lad_t *self, PyObject *unused)

{

count_info info;

int req;

if (self->x_mode == O_RDONLY)

req = SNDCTL_DSP_GETIPTR;

else

req = SNDCTL_DSP_GETOPTR;

if (ioctl(self->x_fd, req, &info) == -1) {

PyErr_SetFromErrno(LinuxAudioError);

return NULL;

}

return Py_BuildValue("iii", info.bytes, info.blocks, info.ptr);

}

static PyMethodDef lad_methods[] = {

{ "read", (PyCFunction)lad_read, METH_VARARGS },

{ "write", (PyCFunction)lad_write, METH_VARARGS },

{ "setparameters", (PyCFunction)lad_setparameters, METH_VARARGS },

{ "bufsize", (PyCFunction)lad_bufsize, METH_VARARGS },

{ "obufcount", (PyCFunction)lad_obufcount, METH_NOARGS },

{ "obuffree", (PyCFunction)lad_obuffree, METH_NOARGS },

{ "flush", (PyCFunction)lad_flush, METH_NOARGS },

{ "close", (PyCFunction)lad_close, METH_NOARGS },

{ "fileno", (PyCFunction)lad_fileno, METH_NOARGS },

{ "getptr", (PyCFunction)lad_getptr, METH_NOARGS },

{ NULL, NULL} /* sentinel */

};

static PyObject *

lad_getattr(lad_t *xp, char *name)

{

return Py_FindMethod(lad_methods, (PyObject *)xp, name);

}

static PyTypeObject Ladtype = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"linuxaudiodev.linux_audio_device", /*tp_name*/

sizeof(lad_t), /*tp_size*/

0, /*tp_itemsize*/

/* methods */

(destructor)lad_dealloc, /*tp_dealloc*/

0, /*tp_print*/

(getattrfunc)lad_getattr, /*tp_getattr*/

0, /*tp_setattr*/

0, /*tp_compare*/

0, /*tp_repr*/

};

static PyObject *

ladopen(PyObject *self, PyObject *args)

{

return (PyObject *)newladobject(args);

}

static PyMethodDef linuxaudiodev_methods[] = {

{ "open", ladopen, METH_VARARGS },

{ 0, 0 },

};

void

initlinuxaudiodev(void)

{

PyObject *m;

if (PyErr_WarnPy3k("the linuxaudiodev module has been removed in "

"Python 3.0; use the ossaudiodev module instead", 2) < 0)

return;

m = Py_InitModule("linuxaudiodev", linuxaudiodev_methods);

if (m == NULL)

return;

LinuxAudioError = PyErr_NewException("linuxaudiodev.error", NULL, NULL);

if (LinuxAudioError)

PyModule_AddObject(m, "error", LinuxAudioError);

if (PyModule_AddIntConstant(m, "AFMT_MU_LAW", (long)AFMT_MU_LAW) == -1)

return;

if (PyModule_AddIntConstant(m, "AFMT_A_LAW", (long)AFMT_A_LAW) == -1)

return;

if (PyModule_AddIntConstant(m, "AFMT_U8", (long)AFMT_U8) == -1)

return;

if (PyModule_AddIntConstant(m, "AFMT_S8", (long)AFMT_S8) == -1)

return;

if (PyModule_AddIntConstant(m, "AFMT_U16_BE", (long)AFMT_U16_BE) == -1)

return;

if (PyModule_AddIntConstant(m, "AFMT_U16_LE", (long)AFMT_U16_LE) == -1)

return;

if (PyModule_AddIntConstant(m, "AFMT_S16_BE", (long)AFMT_S16_BE) == -1)

return;

if (PyModule_AddIntConstant(m, "AFMT_S16_LE", (long)AFMT_S16_LE) == -1)

return;

if (PyModule_AddIntConstant(m, "AFMT_S16_NE", (long)AFMT_S16_NE) == -1)

return;

}

cpython/Modules/linuxaudiodev.c at 2.7 · python-emscripten/cpython · GitHub

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