我正在尝试开始使用OpenAL。
我正在尝试使用以下命令编译从here获得的程序:
g++ main.cpp -lOpenAL
此刻出现错误
"AL/altypes.h" No such file or directory.。有谁知道我该如何解决？我已经安装了libopenal-dev。 (我认为我使用的是Ubuntu 13.04？)#include <iostream>
#include <cstdlib>
#include <AL/altypes.h>
#include <AL/al.h>
#include <AL/alu.h>
#include <AL/alut.h>
#define NUM_BUFFERS 1
#define NUM_SOURCES 1
#define NUM_ENVIRONMENTS 1
ALfloat listenerPos[] = {0.0, 0.0, 4.0};
ALfloat listenerVel[] = {0.0, 0.0, 0.0};
ALfloat listenerOri[] = {0.0, 0.0, 1.0, 0.0, 1.0, 0.0};
ALfloat source0Pos[] = {0.0, 0.0, 0.0};
ALfloat source0Vel[] = {0.0, 0.0, 0.0};
ALuint buffer[NUM_BUFFERS];
ALuint source[NUM_SOURCES];
ALuint environment[NUM_ENVIRONMENTS];
ALsizei size, freq;
ALenum format;
ALvoid* data;
void init(void)
{
alListenerfv(AL_POSITION,listenerPos);
alListenerfv(AL_VELOCITY,listenerVel);
alListenerfv(AL_ORIENTATION,listenerOri);
alGetError(); // clear any error messages
// Generate buffers, or else no sound will happen!
alGenBuffers(NUM_BUFFERS, buffer);
if(alGetError() != AL_NO_ERROR)
{
std::cout << "- Error creating buffers !!" << std::endl;
exit(1);
}
else
{
std::cout << "init() - No errors yet." << std::endl;
}
alutLoadWAVFile((Albyte *) "c.wav", &format, &data, size,&freq, &al_bool);
alBufferData(buffer[0],format,data,size,freq);
alutUnloadWAV(format,data,size,freq);
alGetError(); /* clear error */
alGenSources(NUM_SOURCES, source);
if(alGetError() != AL_NO_ERROR)
{
std::cout << "- Error creating sources !!" << std::endl;
exit(2);
}
else
{
std::cout << "init - no errors after alGenSources" << std::endl;
}
alSourcef(source[0], AL_PITCH, 1.0f);
alSourcef(source[0], AL_GAIN, 1.0f);
alSourcefv(source[0], AL_POSITION, source0Pos);
alSourcefv(source[0], AL_VELOCITY, source0Vel);
alSourcei(source[0], AL_BUFFER,buffer[0]);
alSourcei(source[0], AL_LOOPING, AL_TRUE);
}
int main()
{
//initialise openAL
alutInit(&argc, argv) ;
init();
return 0;
}
顺便说一句，此程序目前无法真正实现我想要的功能。
我想声明一个double / int数组，用数据填充它并播放该数据。有谁知道我该怎么做？
最佳答案
有一个libalut-dev软件包，其中包含实用程序，但是请查看libsndfile中的音频文件I / O。滚动您自己的WAV / PCM解析器始终是 chalice ，这对您有很多帮助，但并不难。不用担心...下面的开放代码将数据合成到开放缓冲区中，然后将其呈现为音频。除了下面的另一页代码，您将获得一个流媒体音频播放器，很方便使用。使用它编译
gcc -o gen_tone_08 gen_tone_08.c -lopenal -lm
让我们知道您的 body 情况如何
#include <stdio.h>
#include <stdlib.h> // gives malloc
#include <math.h>
#ifdef __APPLE__
#include <OpenAL/al.h>
#include <OpenAL/alc.h>
#elif __linux
#include <AL/al.h>
#include <AL/alc.h>
#endif
ALCdevice * openal_output_device;
ALCcontext * openal_output_context;
ALuint internal_buffer;
ALuint streaming_source[1];
int al_check_error(const char * given_label) {
ALenum al_error;
al_error = alGetError();
if(AL_NO_ERROR != al_error) {
printf("ERROR - %s (%s)\n", alGetString(al_error), given_label);
return al_error;
}
return 0;
}
void MM_init_al() {
const char * defname = alcGetString(NULL, ALC_DEFAULT_DEVICE_SPECIFIER);
openal_output_device = alcOpenDevice(defname);
openal_output_context = alcCreateContext(openal_output_device, NULL);
alcMakeContextCurrent(openal_output_context);
// setup buffer and source
alGenBuffers(1, & internal_buffer);
al_check_error("failed call to alGenBuffers");
}
void MM_exit_al() {
ALenum errorCode = 0;
// Stop the sources
alSourceStopv(1, & streaming_source[0]); // streaming_source
int ii;
for (ii = 0; ii < 1; ++ii) {
alSourcei(streaming_source[ii], AL_BUFFER, 0);
}
// Clean-up
alDeleteSources(1, &streaming_source[0]);
alDeleteBuffers(16, &streaming_source[0]);
errorCode = alGetError();
alcMakeContextCurrent(NULL);
errorCode = alGetError();
alcDestroyContext(openal_output_context);
alcCloseDevice(openal_output_device);
}
void MM_render_one_buffer() {
/* Fill buffer with Sine-Wave */
// float freq = 440.f;
float freq = 100.f;
float incr_freq = 0.1f;
int seconds = 4;
// unsigned sample_rate = 22050;
unsigned sample_rate = 44100;
double my_pi = 3.14159;
size_t buf_size = seconds * sample_rate;
short * samples = malloc(sizeof(short) * buf_size);
printf("\nhere is freq %f\n", freq);
int i=0;
for(; i<buf_size; ++i) {
samples[i] = 32760 * sin( (2.f * my_pi * freq)/sample_rate * i );
freq += incr_freq;
// incr_freq += incr_freq;
// freq *= factor_freq;
if (100.0 > freq || freq > 5000.0) {
incr_freq *= -1.0f;
}
}
/* upload buffer to OpenAL */
alBufferData( internal_buffer, AL_FORMAT_MONO16, samples, buf_size, sample_rate);
al_check_error("populating alBufferData");
free(samples);
/* Set-up sound source and play buffer */
// ALuint src = 0;
// alGenSources(1, &src);
// alSourcei(src, AL_BUFFER, internal_buffer);
alGenSources(1, & streaming_source[0]);
alSourcei(streaming_source[0], AL_BUFFER, internal_buffer);
// alSourcePlay(src);
alSourcePlay(streaming_source[0]);
// ---------------------
ALenum current_playing_state;
alGetSourcei(streaming_source[0], AL_SOURCE_STATE, & current_playing_state);
al_check_error("alGetSourcei AL_SOURCE_STATE");
while (AL_PLAYING == current_playing_state) {
printf("still playing ... so sleep\n");
sleep(1); // should use a thread sleep NOT sleep() for a more responsive finish
alGetSourcei(streaming_source[0], AL_SOURCE_STATE, & current_playing_state);
al_check_error("alGetSourcei AL_SOURCE_STATE");
}
printf("end of playing\n");
/* Dealloc OpenAL */
MM_exit_al();
} // MM_render_one_buffer
int main() {
MM_init_al();
MM_render_one_buffer();
}
关于c++ - C++:AL/altypes.h没有这样的文件或目录，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/21238543/