--- /dev/null
+/*
+ * 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.
+ *
+ * (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>
+#if defined(linux)
+#include <linux/soundcard.h>
+
+typedef unsigned long uint32_t;
+
+#elif defined(__FreeBSD__)
+#include <machine/soundcard.h>
+
+#ifndef SNDCTL_DSP_CHANNELS
+#define SNDCTL_DSP_CHANNELS SOUND_PCM_WRITE_CHANNELS
+#endif
+
+#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);
+ return NULL;
+ }
+ if (ioctl(fd, SNDCTL_DSP_GETFMTS, &afmts) == -1) {
+ PyErr_SetFromErrnoWithFilename(LinuxAudioError, basedev);
+ 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 *args)
+{
+ if (!PyArg_ParseTuple(args, ":close"))
+ return NULL;
+
+ if (self->x_fd >= 0) {
+ close(self->x_fd);
+ self->x_fd = -1;
+ }
+ Py_INCREF(Py_None);
+ return Py_None;
+}
+
+static PyObject *
+lad_fileno(lad_t *self, PyObject *args)
+{
+ if (!PyArg_ParseTuple(args, ":fileno"))
+ return NULL;
+ 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;
+ }
+ *nchannels = 0;
+ 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 *args)
+{
+ audio_buf_info ai;
+ int nchannels, ssize;
+
+ if (!PyArg_ParseTuple(args, ":bufsize")) return NULL;
+
+ if (_ssize(self, &nchannels, &ssize) < 0) {
+ 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 *args)
+{
+ audio_buf_info ai;
+ int nchannels, ssize;
+
+ if (!PyArg_ParseTuple(args, ":obufcount"))
+ return NULL;
+
+ if (_ssize(self, &nchannels, &ssize) < 0) {
+ 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 *args)
+{
+ audio_buf_info ai;
+ int nchannels, ssize;
+
+ if (!PyArg_ParseTuple(args, ":obuffree"))
+ return NULL;
+
+ if (_ssize(self, &nchannels, &ssize) < 0) {
+ 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 *args)
+{
+ if (!PyArg_ParseTuple(args, ":flush")) return NULL;
+
+ if (ioctl(self->x_fd, SNDCTL_DSP_SYNC, NULL) == -1) {
+ PyErr_SetFromErrno(LinuxAudioError);
+ return NULL;
+ }
+ Py_INCREF(Py_None);
+ return Py_None;
+}
+
+static PyObject *
+lad_getptr(lad_t *self, PyObject *args)
+{
+ count_info info;
+ int req;
+
+ if (!PyArg_ParseTuple(args, ":getptr"))
+ return NULL;
+
+ 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_VARARGS },
+ { "obuffree", (PyCFunction)lad_obuffree, METH_VARARGS },
+ { "flush", (PyCFunction)lad_flush, METH_VARARGS },
+ { "close", (PyCFunction)lad_close, METH_VARARGS },
+ { "fileno", (PyCFunction)lad_fileno, METH_VARARGS },
+ { "getptr", (PyCFunction)lad_getptr, METH_VARARGS },
+ { NULL, NULL} /* sentinel */
+};
+
+static PyObject *
+lad_getattr(lad_t *xp, char *name)
+{
+ return Py_FindMethod(lad_methods, (PyObject *)xp, name);
+}
+
+static PyTypeObject Ladtype = {
+ PyObject_HEAD_INIT(&PyType_Type)
+ 0, /*ob_size*/
+ "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;
+
+ m = Py_InitModule("linuxaudiodev", linuxaudiodev_methods);
+
+ 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;
+
+ return;
+}
projects / thirdparty / Python / cpython.git / commitdiff
