320 lines
10 KiB
Python
320 lines
10 KiB
Python
# This script generates the Sound interface for Python.
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# It uses the "bgen" package to generate C code.
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# It execs the file sndgen.py which contain the function definitions
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# (sndgen.py was generated by sndscan.py, scanning the <Sound.h> header file).
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from macsupport import *
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# define our own function and module generators
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class SndMixIn: pass
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class SndFunction(SndMixIn, OSErrFunctionGenerator): pass
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class SndMethod(SndMixIn, OSErrMethodGenerator): pass
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# includestuff etc. are imported from macsupport
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includestuff = includestuff + """
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#include <Carbon/Carbon.h>
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"""
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initstuff = initstuff + """
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"""
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# define types used for arguments (in addition to standard and macsupport types)
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class SndChannelPtrType(OpaqueByValueType):
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def declare(self, name):
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# Initializing all SndChannelPtr objects to 0 saves
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# special-casing NewSndChannel(), where it is formally an
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# input-output parameter but we treat it as output-only
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# (since Python users are not supposed to allocate memory)
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Output("SndChannelPtr %s = 0;", name)
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SndChannelPtr = SndChannelPtrType('SndChannelPtr', 'SndCh')
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SndCommand = OpaqueType('SndCommand', 'SndCmd')
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SndCommand_ptr = OpaqueType('SndCommand', 'SndCmd')
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SndListHandle = OpaqueByValueType("SndListHandle", "ResObj")
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SPBPtr = OpaqueByValueType("SPBPtr", "SPBObj")
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ModalFilterUPP = FakeType("(ModalFilterUPP)0")
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#
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# NOTE: the following is pretty dangerous. For void pointers we pass buffer addresses
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# but we have no way to check that the buffer is big enough. This is the same problem
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# as in C, though (but Pythoneers may not be suspecting this...)
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void_ptr = Type("void *", "w")
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class SndCallBackType(InputOnlyType):
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def __init__(self):
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Type.__init__(self, 'PyObject*', 'O')
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def getargsCheck(self, name):
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Output("if (%s != Py_None && !PyCallable_Check(%s))", name, name)
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OutLbrace()
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Output('PyErr_SetString(PyExc_TypeError, "callback must be callable");')
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Output("goto %s__error__;", name)
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OutRbrace()
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def passInput(self, name):
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return "NewSndCallBackUPP(SndCh_UserRoutine)"
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def cleanup(self, name):
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# XXX This knows it is executing inside the SndNewChannel wrapper
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Output("if (_res != NULL && %s != Py_None)", name)
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OutLbrace()
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Output("SndChannelObject *p = (SndChannelObject *)_res;")
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Output("p->ob_itself->userInfo = (long)p;")
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Output("Py_INCREF(%s);", name)
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Output("p->ob_callback = %s;", name)
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OutRbrace()
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DedentLevel()
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Output(" %s__error__: ;", name)
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IndentLevel()
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SndCallBackProcPtr = SndCallBackType()
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SndCallBackUPP = SndCallBackProcPtr
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SndCompletionProcPtr = FakeType('(SndCompletionProcPtr)0') # XXX
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SndCompletionUPP = SndCompletionProcPtr
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##InOutBuf128 = FixedInputOutputBufferType(128)
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StateBlock = StructInputOutputBufferType('StateBlock')
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AudioSelectionPtr = FakeType('0') # XXX
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ProcPtr = FakeType('0') # XXX
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FilePlayCompletionUPP = FakeType('0') # XXX
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SCStatus = StructOutputBufferType('SCStatus')
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SMStatus = StructOutputBufferType('SMStatus')
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CompressionInfo = StructOutputBufferType('CompressionInfo')
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includestuff = includestuff + """
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/* Convert a SndCommand argument */
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static int
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SndCmd_Convert(PyObject *v, SndCommand *pc)
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{
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int len;
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pc->param1 = 0;
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pc->param2 = 0;
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if (PyTuple_Check(v)) {
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if (PyArg_ParseTuple(v, "h|hl", &pc->cmd, &pc->param1, &pc->param2))
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return 1;
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PyErr_Clear();
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return PyArg_ParseTuple(v, "Hhs#", &pc->cmd, &pc->param1, &pc->param2, &len);
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}
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return PyArg_Parse(v, "H", &pc->cmd);
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}
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static pascal void SndCh_UserRoutine(SndChannelPtr chan, SndCommand *cmd); /* Forward */
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static pascal void SPB_completion(SPBPtr my_spb); /* Forward */
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"""
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finalstuff = finalstuff + """
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/* Routine passed to Py_AddPendingCall -- call the Python callback */
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static int
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SndCh_CallCallBack(void *arg)
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{
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SndChannelObject *p = (SndChannelObject *)arg;
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PyObject *args;
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PyObject *res;
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args = Py_BuildValue("(O(hhl))",
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p, p->ob_cmd.cmd, p->ob_cmd.param1, p->ob_cmd.param2);
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res = PyEval_CallObject(p->ob_callback, args);
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Py_DECREF(args);
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if (res == NULL)
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return -1;
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Py_DECREF(res);
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return 0;
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}
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/* Routine passed to NewSndChannel -- schedule a call to SndCh_CallCallBack */
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static pascal void
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SndCh_UserRoutine(SndChannelPtr chan, SndCommand *cmd)
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{
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SndChannelObject *p = (SndChannelObject *)(chan->userInfo);
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if (p->ob_callback != NULL) {
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long A5 = SetA5(p->ob_A5);
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p->ob_cmd = *cmd;
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Py_AddPendingCall(SndCh_CallCallBack, (void *)p);
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SetA5(A5);
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}
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}
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/* SPB callbacks - Schedule callbacks to Python */
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static int
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SPB_CallCallBack(void *arg)
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{
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SPBObject *p = (SPBObject *)arg;
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PyObject *args;
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PyObject *res;
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if ( p->ob_thiscallback == 0 ) return 0;
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args = Py_BuildValue("(O)", p);
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res = PyEval_CallObject(p->ob_thiscallback, args);
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p->ob_thiscallback = 0;
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Py_DECREF(args);
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if (res == NULL)
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return -1;
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Py_DECREF(res);
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return 0;
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}
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static pascal void
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SPB_completion(SPBPtr my_spb)
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{
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SPBObject *p = (SPBObject *)(my_spb->userLong);
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if (p && p->ob_completion) {
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long A5 = SetA5(p->ob_A5);
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p->ob_thiscallback = p->ob_completion; /* Hope we cannot get two at the same time */
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Py_AddPendingCall(SPB_CallCallBack, (void *)p);
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SetA5(A5);
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}
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}
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"""
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# create the module and object definition and link them
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class SndObjectDefinition(PEP252Mixin, ObjectDefinition):
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def outputStructMembers(self):
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ObjectDefinition.outputStructMembers(self)
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Output("/* Members used to implement callbacks: */")
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Output("PyObject *ob_callback;")
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Output("long ob_A5;");
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Output("SndCommand ob_cmd;")
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def outputInitStructMembers(self):
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ObjectDefinition.outputInitStructMembers(self)
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Output("it->ob_callback = NULL;")
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Output("it->ob_A5 = SetCurrentA5();");
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def outputCleanupStructMembers(self):
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ObjectDefinition.outputCleanupStructMembers(self)
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Output("Py_XDECREF(self->ob_callback);")
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def outputFreeIt(self, itselfname):
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Output("SndDisposeChannel(%s, 1);", itselfname)
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def outputConvert(self):
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pass # Not needed
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#
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class SpbObjectDefinition(PEP252Mixin, ObjectDefinition):
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getsetlist = [
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(
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'inRefNum',
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'return Py_BuildValue("l", self->ob_spb.inRefNum);',
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'return -1 + PyArg_Parse(v, "l", &self->ob_spb.inRefNum);',
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None,
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), (
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'count',
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'return Py_BuildValue("l", self->ob_spb.count);',
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'return -1 + PyArg_Parse(v, "l", &self->ob_spb.count);',
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None
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), (
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'milliseconds',
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'return Py_BuildValue("l", self->ob_spb.milliseconds);',
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'return -1 + PyArg_Parse(v, "l", &self->ob_spb.milliseconds);',
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None,
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), (
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'error',
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'return Py_BuildValue("h", self->ob_spb.error);',
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None,
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None
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), (
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'completionRoutine',
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None,
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"""self->ob_spb.completionRoutine = NewSICompletionUPP(SPB_completion);
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self->ob_completion = v;
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Py_INCREF(v);
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return 0;""",
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None,
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)]
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def outputStructMembers(self):
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Output("/* Members used to implement callbacks: */")
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Output("PyObject *ob_completion;")
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Output("PyObject *ob_interrupt;")
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Output("PyObject *ob_thiscallback;");
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Output("long ob_A5;")
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Output("SPB ob_spb;")
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def outputNew(self):
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Output()
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Output("%sPyObject *%s_New(void)", self.static, self.prefix)
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OutLbrace()
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Output("%s *it;", self.objecttype)
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self.outputCheckNewArg()
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Output("it = PyObject_NEW(%s, &%s);", self.objecttype, self.typename)
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Output("if (it == NULL) return NULL;")
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self.outputInitStructMembers()
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Output("return (PyObject *)it;")
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OutRbrace()
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def outputInitStructMembers(self):
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Output("it->ob_completion = NULL;")
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Output("it->ob_interrupt = NULL;")
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Output("it->ob_thiscallback = NULL;")
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Output("it->ob_A5 = SetCurrentA5();")
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Output("memset((char *)&it->ob_spb, 0, sizeof(it->ob_spb));")
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Output("it->ob_spb.userLong = (long)it;")
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def outputCleanupStructMembers(self):
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ObjectDefinition.outputCleanupStructMembers(self)
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Output("self->ob_spb.userLong = 0;")
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Output("self->ob_thiscallback = 0;")
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Output("Py_XDECREF(self->ob_completion);")
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Output("Py_XDECREF(self->ob_interrupt);")
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def outputConvert(self):
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Output("%sint %s_Convert(PyObject *v, %s *p_itself)", self.static, self.prefix, self.itselftype)
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OutLbrace()
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self.outputCheckConvertArg()
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Output("if (!%s_Check(v))", self.prefix)
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OutLbrace()
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Output('PyErr_SetString(PyExc_TypeError, "%s required");', self.name)
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Output("return 0;")
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OutRbrace()
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Output("*p_itself = &((%s *)v)->ob_spb;", self.objecttype)
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Output("return 1;")
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OutRbrace()
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sndobject = SndObjectDefinition('SndChannel', 'SndCh', 'SndChannelPtr')
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spbobject = SpbObjectDefinition('SPB', 'SPBObj', 'SPBPtr')
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spbgenerator = ManualGenerator("SPB", "_res = SPBObj_New(); return _res;")
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module = MacModule('_Snd', 'Snd', includestuff, finalstuff, initstuff)
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module.addobject(sndobject)
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module.addobject(spbobject)
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module.add(spbgenerator)
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# create lists of functions and object methods
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functions = []
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sndmethods = []
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# populate the lists
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execfile('sndgen.py')
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# add the functions and methods to the module and object, respectively
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for f in functions: module.add(f)
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for f in sndmethods: sndobject.add(f)
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# generate output
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SetOutputFileName('_Sndmodule.c')
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module.generate()
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