openal播放ogg的例子

#include <AL/al.h>#include <AL/alut.h>#include <al/alc.h>#include <vorbis/vorbisfile.h>#include <cstdio>#include <iostream>#include <vector>#define BUFFER_SIZE 32768 // 32 KB buffers#pragma comment(lib,"vorbisfile_static_d.lib")#pragma comment(lib,"ogg_d.lib")#pragma comment(lib,"vorbisenc_static_d.lib") #pragma comment(lib,"vorbis_d.lib")typedef struct ALCdevice_struct ALCdevice;typedef struct ALCcontext_struct ALCcontext;using namespace std;bool LoadOGG(char *name, vector<char> &buffer, ALenum &format, ALsizei &freq){ int endian = 0; // 0 for Little-Endian, 1 for Big-Endian int bitStream; long bytes; char array[BUFFER_SIZE]; // Local fixed size array FILE *f; f = fopen(name, "rb"); if (f == NULL) return false; vorbis_info *pInfo; OggVorbis_File oggFile; // Try opening the given file if (ov_open(f, &oggFile, NULL, 0) != 0) return false; pInfo = ov_info(&oggFile, -1); if (pInfo->channels == 1) format = AL_FORMAT_MONO16; else format = AL_FORMAT_STEREO16; freq = pInfo->rate; do { bytes = ov_read(&oggFile, array, BUFFER_SIZE, endian, 2, 1, &bitStream); if (bytes < 0) { ov_clear(&oggFile); cerr << "Error decoding " << fileName << "..." << endl; exit(-1); } buffer.insert(buffer.end(), array, array + bytes); } while (bytes > 0); ov_clear(&oggFile); return true; } int main(int argc, char *argv[]){ ALCdevice* pDevice; ALCcontext* pContext; ALint state; // The state of the sound source ALuint bufferID; // The OpenAL sound buffer ID ALuint sourceID; // The OpenAL sound source ALenum format; // The sound data format ALsizei freq; // The frequency of the sound data vector<char> bufferData; // The sound buffer data from file ALCdevice *device; ALCcontext *context; device = alcOpenDevice(0); context = alcCreateContext(device,0); ALboolean initStatus = alcMakeContextCurrent(context); // Create sound buffer and source alGenBuffers(1, &bufferID); alGenSources(1, &sourceID); // Set the source and listener to the same location alListener3f(AL_POSITION, 0.0f, 0.0f, 0.0f); alSource3f(sourceID, AL_POSITION, 0.0f, 0.0f, 0.0f); // Load the OGG file into memory LoadOGG("Bomb.ogg", bufferData, format, freq); // Upload sound data to buffer alBufferData(bufferID, format, &bufferData[0], static_cast<ALsizei>(bufferData.size()), freq); // Attach sound buffer to source alSourcei(sourceID, AL_BUFFER, bufferID);alSourcef (sourceID, AL_GAIN, 1.0 ); // Finally, play the sound!!! alSourcePlay(sourceID); do { // Query the state of the souce alGetSourcei(sourceID, AL_SOURCE_STATE, &state); } while (state != AL_STOPPED); // Clean up sound buffer and source alDeleteBuffers(1, &bufferID); alDeleteSources(1, &sourceID); alcDestroyContext(context);alcCloseDevice(device); return 0;}