OpenAL中如何设置通道增益？

发布于 2024-09-28 04:08:06 字数 127 浏览 2 评论 0原文

我尝试了一下

alBufferf (myChannelId, AL_MAX_GAIN (and AL_GAIN), volumeValue);

，得到了错误 0xA002。

原文

I tried

alBufferf (myChannelId, AL_MAX_GAIN (and AL_GAIN), volumeValue);

and got error 0xA002.

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空城旧梦 2024-10-05 04:08:06

正如 Isaac 所说，您可能希望在源上设置增益：

alSourcef (sourceID, AL_GAIN, volume)

为了避免将来收到神秘的错误代码，您应该养成在您认为可能失败的调用/您尝试调试的调用之后轮询错误的习惯。

这样，您就会立即知道“0xA002”是“AL_INVALID_ENUM”。

要使用 OpenAL 执行此操作，您可以调用“alGetError()”，它会清除并返回最近的错误；

ALenum ALerror = AL_NO_ERROR;
ALerror = alGetError();
std::cout << getALErrorString(ALerror) << std::endl;

您需要编写类似的内容来获取错误代码并返回/打印字符串

std::string getALErrorString(ALenum err) {
    switch(err) {
    case AL_NO_ERROR:       return std::string("AL_NO_ERROR - (No error)."); break;
    case AL_INVALID_NAME:       return std::string("AL_INVALID_NAME - Invalid Name paramater passed to AL call."); break;
    case AL_INVALID_ENUM:       return std::string("AL_INVALID_ENUM - Invalid parameter passed to AL call."); break;
    case AL_INVALID_VALUE:      return std::string("AL_INVALID_VALUE - Invalid enum parameter value."); break;
    case AL_INVALID_OPERATION:  return std::string("AL_INVALID_OPERATION"); break;
    case AL_OUT_OF_MEMORY:      return std::string("AL_OUT_OF_MEMORY"); break;
    default:            return std::string("AL Unknown Error."); break;
    };
}

您可以在 OpenAL 程序员指南。

例如，在第 39 页，您可以看到 alSourcef 上的 AL_INVALID_ENUM 表示“指定的参数无效”。

As Isaac has said, you probably want to be setting gain on your a sources:

alSourcef (sourceID, AL_GAIN, volume)

To avoid recieving mysterious error codes in future, you should get into the habit of polling for errors after calls you think may fail / calls you are trying to debug.

This way, you'd know immediately that "0xA002" is "AL_INVALID_ENUM".

To do this with OpenAL you call "alGetError()" which clears and returns the most recent error;

ALenum ALerror = AL_NO_ERROR;
ALerror = alGetError();
std::cout << getALErrorString(ALerror) << std::endl;

You'll need to write something like this to take an error code and return/print a string

std::string getALErrorString(ALenum err) {
    switch(err) {
    case AL_NO_ERROR:       return std::string("AL_NO_ERROR - (No error)."); break;
    case AL_INVALID_NAME:       return std::string("AL_INVALID_NAME - Invalid Name paramater passed to AL call."); break;
    case AL_INVALID_ENUM:       return std::string("AL_INVALID_ENUM - Invalid parameter passed to AL call."); break;
    case AL_INVALID_VALUE:      return std::string("AL_INVALID_VALUE - Invalid enum parameter value."); break;
    case AL_INVALID_OPERATION:  return std::string("AL_INVALID_OPERATION"); break;
    case AL_OUT_OF_MEMORY:      return std::string("AL_OUT_OF_MEMORY"); break;
    default:            return std::string("AL Unknown Error."); break;
    };
}

You can lookup exactly what the error code means for a specific function call in OpenAL Programmer's Guide .

For example, on page 39 you can see AL_INVALID_ENUM on alSourcef means "The specified parameter is not valid".

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