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为了在 Ubuntu18 上编写播放 ogg vorbis 文件的代码,我安装了 openal 和 alut,然后我下载了 libogg-1.3.3 和 libvorbis-1.3.6 并执行了以下操作:

./configure
make
sudo make install

据我所知,没有错误,它们似乎安装在我的 linux 系统中。

我复制了一个演示。我可以附加整个代码,它不是很大。作为参考,代码在这里:https ://www.gamedev.net/articles/programming/general-and-gameplay-programming/introduction-to-ogg-vorbis-r2031/

#include <AL/al.h>
#include <AL/alut.h>
#include <vorbis/vorbisfile.h>
#include <cstdio>
#include <iostream>
#include <vector>

constexpr int BUFFER_SIZE=32768;     // 32 KB buffers

using namespace std;

void loadOgg(const char fileName[],
                         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 = fopen(fileName, "rb");
  vorbis_info *pInfo;
  OggVorbis_File oggFile;
  ov_open(f, &oggFile, NULL, 0);
  pInfo = ov_info(&oggFile, -1);
  format = pInfo->channels == 1 ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16;
  freq = pInfo->rate;
  // decode the OGG file and put the raw audio dat into the buffer
  do {
    // Read up to a buffer's worth of decoded sound data
    bytes = ov_read(&oggFile, array, BUFFER_SIZE, endian, 2, 1, &bitStream);
    // Append to end of buffer
    buffer.insert(buffer.end(), array, array + bytes);
  } while (bytes > 0);
  ov_clear(&oggFile); // release the file resources at the end
}

int main(int argc, char *argv[]) {
  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> buffer;     // The sound buffer data from file

  // Initialize the OpenAL library
  alutInit(&argc, argv);

  // 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);
    loadOgg(argv[1], buffer, format, freq);
}

编译:

g++ -g playSound.cc -lopenal -lalut -logg -lvorbis

没有错误抱怨找不到任何库,但是有一个未定义的符号 ov_open、ov_info、ov_read

因为我假设这些符号在 libogg 或 libvorbis 中,所以我尝试删除 -logg -lvorbis (结果相同),然后作为健全性检查,我尝试链接到一个假库(-lfugu),这给了我一个错误,因为 fugu 确实不存在。很明显,该链接正在查找 ogg 和 vorbis 库,但没有定义这些符号。

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