initial commit with some toy code

.gitignore

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+*.swp

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2013 Spencer Russell
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

Makefile

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+
+default: test

README

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+This is a Julia interface to PortAudio.
+
+More info to come...

deps/src/Makefile

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+# Makefile lifted from Clang.jl
+
+all: default
+
+ifeq (exists, $(shell [ -e Make.user ] && echo exists ))
+include Make.user
+endif
+
+.PHONY: all clean check-env default
+
+#check-env:
+#ifndef JULIA_ROOT
+#        $(error Environment variable JULIA_ROOT is not set.)
+#endif
+
+INC =-I"$(JULIA_ROOT)/usr/include"
+FLAGS =-Wall -Wno-strict-aliasing -fno-omit-frame-pointer -fPIC
+CFLAGS =-g
+LIBS =
+
+OBJS = shim.o
+# libm can be removed later, it's just for the sin function used in testing
+LIBS += -lportaudio -lm
+
+# Figure out OS and architecture
+OS = $(shell uname)
+ifeq ($(OS), MINGW32_NT-6.1)
+  OS=WINNT
+endif
+
+# file extensions
+ifeq ($(OS), WINNT)
+  SHLIB_EXT = dll
+else ifeq ($(OS), Darwin)
+  SHLIB_EXT = dylib
+else
+  SHLIB_EXT = so
+endif
+
+default: portaudio_shim.$(SHLIB_EXT)
+
+%.o: %.c
+	$(CC) $< -fPIC -c -o $@ $(INC) $(CFLAGS) $(FLAGS)
+
+portaudio_shim.$(SHLIB_EXT): $(OBJS)
+	$(CC) $(OBJS) -rdynamic -shared -o $@ $(LDFLAGS) $(LIBS)
+
+clean:
+	rm -f *.o *.$(SHLIB_EXT)

deps/src/shim.c

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+#include <portaudio.h>
+#include <math.h>
+#include <stdio.h>
+
+#define SAMPLE_RATE 44100
+
+static int patestCallback(const void *inputBuffer, void *outputBuffer,
+                          unsigned long framesPerBuffer,
+                          const PaStreamCallbackTimeInfo* timeInfo,
+                          PaStreamCallbackFlags statusFlags,
+                          void *userData);
+
+static PaStream *sin_stream;
+
+
+PaError play_sin(void)
+{
+    PaError err;
+//    PaDeviceInfo *info;
+//    int numDevices;
+
+//    printf("Found Devices:\n");
+//    numDevices = Pa_GetDeviceCount();
+//    for(i = 0; i < numDevices; ++i)
+//    {
+//        info = Pa_GetDeviceInfo(i);
+//        printf("%s\n", info->name);
+//    }
+
+    err = Pa_OpenDefaultStream(&sin_stream,
+            0,          /* no input channels */
+            2,          /* stereo output */
+            paFloat32,  /* 32 bit floating point output */
+            SAMPLE_RATE,
+            1024,        /* frames per buffer, i.e. the number of sample frames
+                           that PortAudio will request from the callback. Many
+                           apps may want to use paFramesPerBufferUnspecified,
+                           which tells PortAudio to pick the best, possibly
+                           changing, buffer size.*/
+            patestCallback, /* this is your callback function */
+            NULL); /*This is a pointer that will be passed to your callback*/
+    if(err != paNoError)
+    {
+        return err;
+    }
+
+    err = Pa_StartStream(sin_stream);
+    if(err != paNoError)
+    {
+        return err;
+    }
+
+    return paNoError;
+}
+
+PaError stop_sin(void)
+{
+    PaError err;
+    err = Pa_StopStream(sin_stream);
+    if(err != paNoError)
+    {
+        return err;
+    }
+
+    err = Pa_CloseStream(sin_stream);
+    if( err != paNoError )
+    {
+        return err;
+    }
+    return paNoError;
+}
+
+
+/*
+ * This routine will be called by the PortAudio engine when audio is needed.
+ * It may called at interrupt level on some machines so don't do anything that
+ * could mess up the system like calling malloc() or free().
+ */
+static int patestCallback(const void *inputBuffer, void *outputBuffer,
+                           unsigned long framesPerBuffer,
+                           const PaStreamCallbackTimeInfo* timeInfo,
+                           PaStreamCallbackFlags statusFlags,
+                           void *userData)
+{
+    float freq_l = 100;
+    float freq_r = 150;
+    static float phase_l = 0;
+    static float phase_r = 0;
+
+    float *out = (float*)outputBuffer;
+    unsigned int i;
+
+    for(i=0; i<framesPerBuffer; i++)
+    {
+        /* should modulo by 2PI */
+        phase_l += (2 * M_PI * freq_l / SAMPLE_RATE);
+        if(phase_l > 2 * M_PI)
+        {
+            phase_l -= 2 * M_PI;
+        }
+        phase_r += (2 * M_PI * freq_r / SAMPLE_RATE);
+        if(phase_r > 2 * M_PI)
+        {
+            phase_r -= 2 * M_PI;
+        }
+        out[2*i] = sin(phase_l);
+        out[2*i + 1] = sin(phase_r);
+    }
+    return 0;
+}

src/portaudio.jl

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+# thanks to Gustavo Goretkin for the start on this
+
+module PortAudio
+
+typealias PaTime Cdouble
+typealias PaError Cint
+typealias PaSampleFormat Culong
+typealias PaStream Void
+
+const PA_NO_ERROR::PaError = 0
+
+function handle_status(err::PaError)
+    if err != PA_NO_ERROR
+        msg = ccall((:Pa_GetErrorText, "libportaudio"),
+                    Ptr{Cchar}, (PaError,), err)
+        error(bytestring(msg))
+    end
+end
+
+function init()
+    err = ccall((:Pa_Initialize, "libportaudio"), PaError, ())
+    handle_status(err)
+end
+
+function deinit()
+    err = ccall((:Pa_Terminate, "libportaudio"), PaError, ())
+    handle_status(err)
+end
+
+function play_sin()
+end
+
+function stop_sin()
+end
+
+end # module PortAudio
+
+
+type PaStreamCallbackTimeInfo
+    inputBufferAdcTime::PaTime
+    currentTime::PaTime
+    outputBufferDacTime::PaTime
+end
+
+typealias PaStreamCallbackFlags Culong
+
+
+function stream_callback{T}(    input_::Ptr{T}, 
+    output_::Ptr{T}, 
+    frame_count::Culong, 
+    time_info::Ptr{PaStreamCallbackTimeInfo},
+    status_flags::PaStreamCallbackFlags,
+    user_data::Ptr{Void})
+
+
+    println("stfl:$status_flags  \tframe_count:$frame_count")
+
+    ret = 0
+    return convert(Cint,ret)::Cint    #continue stream
+
+end
+
+T=Float32
+stream_callback_c = cfunction(stream_callback,Cint,
+(Ptr{T},Ptr{T},Culong,Ptr{PaStreamCallbackTimeInfo},PaStreamCallbackFlags,Ptr{Void})
+)
+stream_obj = Array(Ptr{PaStream},1)
+
+pa_err = ccall( 
+(:Pa_Initialize,"libportaudio"), 
+PaError,
+(),
+)
+
+println(get_error_text(pa_err))
+
+pa_err = ccall( 
+(:Pa_OpenDefaultStream,"libportaudio"), 
+PaError,
+(Ptr{Ptr{PaStream}},Cint,Cint,PaSampleFormat,Cdouble,Culong,Ptr{Void},Any),
+stream_obj,0,1,0x1,8000.0,4096,stream_callback_c,None
+)
+
+println(get_error_text(pa_err))
+
+function start_stream(stream)
+    pa_err = ccall( 
+    (:Pa_StartStream,"libportaudio"), 
+    PaError,
+    (Ptr{PaStream},),
+    stream
+    )    
+    println(get_error_text(pa_err))
+end
+
+end #module