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https://github.com/python/cpython.git
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440 lines
11 KiB
C
440 lines
11 KiB
C
/* Hey Emacs, this is -*-C-*-
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******************************************************************************
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* linuxaudiodev.c -- Linux audio device for python.
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*
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* Author : Peter Bosch
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* Created On : Thu Mar 2 21:10:33 2000
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* Last Modified By: Peter Bosch
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* Last Modified On: Fri Mar 24 11:27:00 2000
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* Status : Unknown, Use with caution!
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*
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* Unless other notices are present in any part of this file
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* explicitly claiming copyrights for other people and/or
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* organizations, the contents of this file is fully copyright
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* (C) 2000 Peter Bosch, all rights reserved.
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******************************************************************************
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*/
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#include "Python.h"
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#include "structmember.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#include <sys/ioctl.h>
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#include <linux/soundcard.h>
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typedef unsigned long uint32_t;
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typedef struct {
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PyObject_HEAD;
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int x_fd; /* The open file */
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int x_icount; /* Input count */
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int x_ocount; /* Output count */
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uint32_t x_afmts; /* Supported audio formats */
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} lad_t;
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static struct {
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int a_bps;
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uint32_t a_fmt;
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} audio_types[] = {
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{ 8, AFMT_MU_LAW },
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{ 8, AFMT_U8 },
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{ 8, AFMT_S8 },
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{ 16, AFMT_U16_BE },
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{ 16, AFMT_U16_LE },
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{ 16, AFMT_S16_BE },
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{ 16, AFMT_S16_LE },
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};
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staticforward PyTypeObject Ladtype;
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static PyObject *LinuxAudioError;
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static lad_t *
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newladobject(PyObject *arg)
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{
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lad_t *xp;
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int fd, afmts, imode;
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char *mode;
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char *basedev;
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/* Check arg for r/w/rw */
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if (!PyArg_ParseTuple(arg, "s:open", &mode)) return NULL;
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if (strcmp(mode, "r") == 0)
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imode = 0;
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else if (strcmp(mode, "w") == 0)
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imode = 1;
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else {
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PyErr_SetString(LinuxAudioError, "Mode should be one of 'r', or 'w'");
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return NULL;
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}
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/* Open the correct device. The base device name comes from the
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* AUDIODEV environment variable first, then /dev/audio. The
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* control device tacks "ctl" onto the base device name.
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*/
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basedev = getenv("AUDIODEV");
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if (!basedev)
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basedev = "/dev/dsp";
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if ((fd = open(basedev, imode)) < 0) {
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PyErr_SetFromErrnoWithFilename(LinuxAudioError, basedev);
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return NULL;
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}
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if (imode && ioctl(fd, SNDCTL_DSP_NONBLOCK, NULL) < 0) {
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PyErr_SetFromErrnoWithFilename(LinuxAudioError, basedev);
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return NULL;
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}
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if (ioctl(fd, SNDCTL_DSP_GETFMTS, &afmts) < 0) {
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PyErr_SetFromErrnoWithFilename(LinuxAudioError, basedev);
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return NULL;
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}
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/* Create and initialize the object */
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if ((xp = PyObject_New(lad_t, &Ladtype)) == NULL) {
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close(fd);
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return NULL;
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}
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xp->x_fd = fd;
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xp->x_icount = xp->x_ocount = 0;
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xp->x_afmts = afmts;
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return xp;
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}
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static void
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lad_dealloc(lad_t *xp)
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{
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/* if already closed, don't reclose it */
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if (xp->x_fd != -1)
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close(xp->x_fd);
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PyObject_Del(xp);
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}
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static PyObject *
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lad_read(lad_t *self, PyObject *args)
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{
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int size, count;
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char *cp;
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PyObject *rv;
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if (!PyArg_ParseTuple(args, "i:read", &size))
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return NULL;
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rv = PyString_FromStringAndSize(NULL, size);
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if (rv == NULL)
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return NULL;
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if (!(cp = PyString_AsString(rv))) {
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Py_DECREF(rv);
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return NULL;
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}
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if ((count = read(self->x_fd, cp, size)) < 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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Py_DECREF(rv);
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return NULL;
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}
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self->x_icount += count;
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return rv;
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}
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static PyObject *
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lad_write(lad_t *self, PyObject *args)
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{
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char *cp;
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int rv, size;
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if (!PyArg_ParseTuple(args, "s#:write", &cp, &size)) return NULL;
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while (size > 0) {
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if ((rv = write(self->x_fd, cp, size)) < 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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self->x_ocount += rv;
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size -= rv;
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cp += rv;
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}
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Py_INCREF(Py_None);
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return Py_None;
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}
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static PyObject *
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lad_close(lad_t *self, PyObject *args)
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{
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if (!PyArg_ParseTuple(args, ":close")) return NULL;
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if (self->x_fd >= 0) {
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close(self->x_fd);
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self->x_fd = -1;
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}
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Py_INCREF(Py_None);
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return Py_None;
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}
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static PyObject *
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lad_fileno(lad_t *self, PyObject *args)
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{
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if (!PyArg_ParseTuple(args, ":fileno")) return NULL;
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return PyInt_FromLong(self->x_fd);
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}
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static PyObject *
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lad_setparameters(lad_t *self, PyObject *args)
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{
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int rate, ssize, nchannels, stereo, n, fmt;
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if (!PyArg_ParseTuple(args, "iiii:setparameters",
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&rate, &ssize, &nchannels, &fmt))
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return NULL;
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if (rate < 0 || ssize < 0 || (nchannels != 1 && nchannels != 2)) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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if (ioctl(self->x_fd, SOUND_PCM_WRITE_RATE, &rate) < 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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if (ioctl(self->x_fd, SNDCTL_DSP_SAMPLESIZE, &ssize) < 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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stereo = (nchannels == 1)? 0: (nchannels == 2)? 1: -1;
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if (ioctl(self->x_fd, SNDCTL_DSP_STEREO, &stereo) < 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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for (n = 0; n != sizeof(audio_types) / sizeof(audio_types[0]); n++)
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if (fmt == audio_types[n].a_fmt)
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break;
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if (n == sizeof(audio_types) / sizeof(audio_types[0]) ||
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audio_types[n].a_bps != ssize ||
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(self->x_afmts & audio_types[n].a_fmt) == 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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if (ioctl(self->x_fd, SNDCTL_DSP_SETFMT, &audio_types[n].a_fmt) < 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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Py_INCREF(Py_None);
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return Py_None;
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}
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static int
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_ssize(lad_t *self, int *nchannels, int *ssize)
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{
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int fmt;
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fmt = 0;
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if (ioctl(self->x_fd, SNDCTL_DSP_SETFMT, &fmt) < 0)
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return -errno;
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switch (fmt) {
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case AFMT_MU_LAW:
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case AFMT_A_LAW:
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case AFMT_U8:
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case AFMT_S8:
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*ssize = sizeof(char);
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break;
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case AFMT_S16_LE:
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case AFMT_S16_BE:
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case AFMT_U16_LE:
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case AFMT_U16_BE:
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*ssize = sizeof(short);
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break;
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case AFMT_MPEG:
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case AFMT_IMA_ADPCM:
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default:
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return -EOPNOTSUPP;
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}
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*nchannels = 0;
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if (ioctl(self->x_fd, SNDCTL_DSP_CHANNELS, nchannels) < 0)
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return -errno;
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return 0;
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}
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/* bufsize returns the size of the hardware audio buffer in number
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of samples */
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static PyObject *
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lad_bufsize(lad_t *self, PyObject *args)
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{
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audio_buf_info ai;
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int nchannels, ssize;
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if (!PyArg_ParseTuple(args, ":bufsize")) return NULL;
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if (_ssize(self, &nchannels, &ssize) < 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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if (ioctl(self->x_fd, SNDCTL_DSP_GETOSPACE, &ai) < 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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return PyInt_FromLong((ai.fragstotal * ai.fragsize) / (nchannels * ssize));
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}
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/* obufcount returns the number of samples that are available in the
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hardware for playing */
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static PyObject *
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lad_obufcount(lad_t *self, PyObject *args)
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{
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audio_buf_info ai;
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int nchannels, ssize;
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if (!PyArg_ParseTuple(args, ":obufcount"))
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return NULL;
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if (_ssize(self, &nchannels, &ssize) < 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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if (ioctl(self->x_fd, SNDCTL_DSP_GETOSPACE, &ai) < 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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return PyInt_FromLong((ai.fragstotal * ai.fragsize - ai.bytes) /
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(ssize * nchannels));
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}
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/* obufcount returns the number of samples that can be played without
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blocking */
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static PyObject *
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lad_obuffree(lad_t *self, PyObject *args)
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{
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audio_buf_info ai;
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int nchannels, ssize;
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if (!PyArg_ParseTuple(args, ":obuffree"))
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return NULL;
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if (_ssize(self, &nchannels, &ssize) < 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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if (ioctl(self->x_fd, SNDCTL_DSP_GETOSPACE, &ai) < 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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return PyInt_FromLong(ai.bytes / (ssize * nchannels));
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}
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/* Flush the device */
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static PyObject *
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lad_flush(lad_t *self, PyObject *args)
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{
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if (!PyArg_ParseTuple(args, ":flush")) return NULL;
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if (ioctl(self->x_fd, SNDCTL_DSP_SYNC, NULL) < 0) {
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PyErr_SetFromErrno(LinuxAudioError);
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return NULL;
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}
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Py_INCREF(Py_None);
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return Py_None;
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}
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static PyMethodDef lad_methods[] = {
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{ "read", (PyCFunction)lad_read, METH_VARARGS },
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{ "write", (PyCFunction)lad_write, METH_VARARGS },
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{ "setparameters", (PyCFunction)lad_setparameters, METH_VARARGS },
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{ "bufsize", (PyCFunction)lad_bufsize, METH_VARARGS },
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{ "obufcount", (PyCFunction)lad_obufcount, METH_VARARGS },
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{ "obuffree", (PyCFunction)lad_obuffree, METH_VARARGS },
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{ "flush", (PyCFunction)lad_flush, METH_VARARGS },
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{ "close", (PyCFunction)lad_close, METH_VARARGS },
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{ "fileno", (PyCFunction)lad_fileno, METH_VARARGS },
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{ NULL, NULL} /* sentinel */
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};
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static PyObject *
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lad_getattr(lad_t *xp, char *name)
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{
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return Py_FindMethod(lad_methods, (PyObject *)xp, name);
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}
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static PyTypeObject Ladtype = {
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PyObject_HEAD_INIT(&PyType_Type)
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0, /*ob_size*/
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"linux_audio_device", /*tp_name*/
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sizeof(lad_t), /*tp_size*/
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0, /*tp_itemsize*/
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/* methods */
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(destructor)lad_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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(getattrfunc)lad_getattr, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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};
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static PyObject *
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ladopen(PyObject *self, PyObject *args)
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{
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return (PyObject *)newladobject(args);
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}
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static PyMethodDef linuxaudiodev_methods[] = {
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{ "open", ladopen, METH_VARARGS },
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{ 0, 0 },
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};
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void
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initlinuxaudiodev(void)
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{
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PyObject *m, *d, *x;
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m = Py_InitModule("linuxaudiodev", linuxaudiodev_methods);
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d = PyModule_GetDict(m);
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LinuxAudioError = PyErr_NewException("linuxaudiodev.error", NULL, NULL);
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if (LinuxAudioError)
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PyDict_SetItemString(d, "error", LinuxAudioError);
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x = PyInt_FromLong((long) AFMT_MU_LAW);
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if (x == NULL || PyDict_SetItemString(d, "AFMT_MU_LAW", x) < 0)
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goto error;
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Py_DECREF(x);
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x = PyInt_FromLong((long) AFMT_U8);
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if (x == NULL || PyDict_SetItemString(d, "AFMT_U8", x) < 0)
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goto error;
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Py_DECREF(x);
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x = PyInt_FromLong((long) AFMT_S8);
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if (x == NULL || PyDict_SetItemString(d, "AFMT_S8", x) < 0)
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goto error;
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Py_DECREF(x);
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x = PyInt_FromLong((long) AFMT_U16_BE);
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if (x == NULL || PyDict_SetItemString(d, "AFMT_U16_BE", x) < 0)
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goto error;
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Py_DECREF(x);
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x = PyInt_FromLong((long) AFMT_U16_LE);
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if (x == NULL || PyDict_SetItemString(d, "AFMT_U16_LE", x) < 0)
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goto error;
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Py_DECREF(x);
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x = PyInt_FromLong((long) AFMT_S16_BE);
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if (x == NULL || PyDict_SetItemString(d, "AFMT_S16_BE", x) < 0)
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goto error;
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Py_DECREF(x);
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x = PyInt_FromLong((long) AFMT_S16_LE);
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if (x == NULL || PyDict_SetItemString(d, "AFMT_S16_LE", x) < 0)
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goto error;
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Py_DECREF(x);
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/* Check for errors */
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if (PyErr_Occurred()) {
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error:
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Py_FatalError("can't initialize module linuxaudiodev");
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}
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}
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