portaudio

问题 I have problem building Port Audio on windows machine. I am following this tutorial: http://portaudio.com/docs/v19-doxydocs/compile_windows_mingw.html Running make after ./configure runs build process and finally outputs this message and that is where build process stop. /bin/sh ./libtool --mode=link gcc -shared -rpath /usr/local/lib -no-undefined - export-symbols-regex "(Pa|PaMacCore|PaJack|PaAlsa|PaAsio|PaOSS)_.*" -version-inf o 2:0:0 -o lib/libportaudio.la src/common/pa_allocation.lo src

问题 I'm using speex to encode some audio data and send it over UDP, and decode it on the other side. I ran a few tests with speex, and noticed that if I decode a packet straight after I encoded it, the decoded data is in no way close to the original data. Most of the bytes at the start of the buffer are 0. So when I decode the audio sent over UDP, all I get is noise. This is how I am encoding the audio: bool AudioEncoder::encode( float *raw, char *encoded_bits ) { for ( size_t i = 0; i < 256; i++

问题 I am trying to write an audio application using PortAudio, but if any other audio programs (usually Firefox) are running at the time which I try to run my program, I get the following error: PaHost_OpenStream: could not open /dev/dsp for O_WRONLY PaHost_OpenStream: ERROR - result = -10000 An error occured while using the portaudio stream Error number: -10000 Error message: Host error. Obviously, this makes my program pretty useless since it won't work if another program is using sound. Is

问题 I am trying to create a music visualizer application in PortAudio, I did some basic research and found some examples on how to record from a mic to a (temporary) file. But there was no example where the data is not used runtime during the recording. So how can I start a continuous audio-stream where I can catch the data from the current "frame"? This is how I tried to do it: #include <stdio.h> #include <unistd.h> #include <time.h> #include <stdlib.h> #include "portaudio.h" #define SAMPLE_RATE

问题 I am trying to write a simple audio function generator in Python, to be run on a Raspberry Pi (model 2). The code essentially does this: Generate 1 second of the audio signal (say, a sine wave, or a square wave, etc) Play it repeatedly in a loop For example: import pyaudio from numpy import linspace,sin,pi,int16 def note(freq, len, amp=1, rate=44100): t = linspace(0,len,len*rate) data = sin(2*pi*freq*t)*amp return data.astype(int16) # two byte integers RATE = 44100 FREQ = 261.6 pa = pyaudio

问题 I asked a similar question a while ago but I didn't know very much, so I wasn't able to be specific enough. I want to write a program that takes input from my microphone, processes it, and then sends the output to a fake "virtual microphone" as if the processed sound I created was what a microphone was hearing. I would then like to be able to use this virtual microphone with any application that supports choosing your microphone input (pretty much any well written software) as a valid

问题 I was wondering if it is possible to read data that is going from the sound card to the speakers with the PortAudio API. After looking through the documentation, I found an example (http://portaudio.com/docs/v19-doxydocs/paex__record_8c_source.html) where they read data from the microphone. However, I would like to be able to capture the audio that is coming from the sound card. Is there a way to do this in PortAudio and if not please point me in the right direction. Also, it is important

问题 I have made a simple Makefile project using Portaudio libraries and the project has been working fine with the following Makefile: CXXFLAGS = -O2 -g -Wall -fmessage-length=0 OBJS = RecAudio.o LIBS = ../Portaudio/portaudio/lib/.libs/libportaudio.a -lpthread -lrt -lasound #LIBS = -lportaudio -lpthread -lrt -lasound TARGET = RecAudio $(TARGET): $(OBJS) $(CXX) -o $(TARGET) $(OBJS) $(LIBS) all: $(TARGET) clean: rm -f $(OBJS) $(TARGET) I'll try to integrate Portaudio libraries into another project

问题 I'm implementing a low pass filter in C wih the PortAudio library. I record my microphone input with a script from PortAudio itself. There I added the following code: float cutoff = 4000.0; float filter(float cutofFreq){ float RC = 1.0/(cutofFreq * 2 * M_PI); float dt = 1.0/SAMPLE_RATE; float alpha = dt/(RC+dt); return alpha; } float filteredArray[numSamples]; filteredArray[0] = data.recordedSamples[0]; for(i=1; i<numSamples; i++){ if(i%SAMPLE_RATE == 0){ cutoff = cutoff - 400; } data

问题 I am trying to use Portaudio on OSX 10.9 in Xcode 5, but am running into some issues. I have downloaded the source, rand ./configure and make, included the include folder in my xcode project, and ran Pa_Initialize() to get this error. I have tried setting the architectures in the xcode build settings from "Standard Architectures (64-bit Intel)(x86_64)" to "Universal (32/64-bit Intel)(x86_64, i386)" with no success. I have followed instructions/solutions here, here and here but have found no