以下是使用WASAPI API 在Windows平台上播放PCM文件的示例代码：

#include <iostream>
#include <fstream>
#include <vector>
#include <Audioclient.h>

// 音频设备参数
#define SAMPLE_RATE 44100    // 采样率
#define CHANNELS 2           // 声道数

int main() {
    // 打开PCM文件
    std::ifstream pcmFile("audio.pcm", std::ios::binary);
    if (!pcmFile.is_open()) {
        std::cout << "Failed to open PCM file." << std::endl;
        return -1;
    }

    // 读取PCM数据到缓冲区
    pcmFile.seekg(0, std::ios_base::end);
    std::streampos fileSize = pcmFile.tellg();
    pcmFile.seekg(0, std::ios_base::beg);

    std::vector<char> buffer(fileSize);
    pcmFile.read(buffer.data(), fileSize);

	// 初始化COM组件
	CoInitialize(nullptr);

	// 创建音频客户端对象
	IAudioClient* audioClient = nullptr;
	HRESULT hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), nullptr, CLSCTX_ALL, 
			                      __uuidof(IMMDeviceEnumerator), (void**)&enumerator);
	if (FAILED(hr)) {
	    std::cout << "Failed to create instance of MMDeviceEnumerator." << std::endl;
	    return -1;
	}

	hr = enumerator->GetDefaultAudioEndpoint(eRender, eConsole, &device);
	if (FAILED(hr)) {
	    enumerator->Release();
	    std::cout << "Failed to get default audio endpoint." << std::endl;
	    return -1;
	}

	hr = device->Activate(__uuidof(IAudioClient), CLSCTX_ALL, nullptr, (void**)&audioClient);
	if (FAILED(hr)) {
	    enumerator->Release();
	    device->Release();
	    std::cout << "Failed to activate audio client." << std::endl;
	    return -1;
	}

	// 配置音频格式
	WAVEFORMATEX format = {};
	format.wFormatTag = WAVE_FORMAT_PCM;
	format.nChannels = CHANNELS;
	format.nSamplesPerSec = SAMPLE_RATE;
	format.wBitsPerSample = 16; // 16位
	format.nBlockAlign = format.nChannels * (format.wBitsPerSample / 8);
	format.nAvgBytesPerSec = format.nSamplesPerSec * format.nBlockAlign;

	hr = audioClient->Initialize(AUDCLNT_SHAREMODE_SHARED, AUDCLNT_STREAMFLAGS_EVENTCALLBACK,
	                             0, 0, &format, nullptr);
	if (FAILED(hr)) {
	    audioClient->Release();
	    enumerator->Release();
	    device->Release();
	    std::cout << "Failed to initialize audio client." << std::endl;
	    return -1;
	}

	// 获取缓冲区大小
	UINT32 bufferFrameCount;
	hr = audioClient->GetBufferSize(&bufferFrameCount);
	if (FAILED(hr)) {
        audioClient->Release();
        enumerator->Release();
        device->Release();
        std::cout << "Failed to get buffer size." << std::endl;
        return -1;   
    }

    // 获取渲染器接口
    IAudioRenderClient* renderClient = nullptr;
    hr = audioClient->GetService(__uuidof(IAudioRenderClient), (void**)&renderClient);
    if (FAILED(hr)) {
    	audioClient->Release();
    	enumerator->Release();
    	device->Release();
    	std::cout << "Failed to get render client." << std::endl;
    	return -1;
    }

    // 启动音频流
    hr = audioClient->Start();
    if (FAILED(hr)) {
        renderClient->Release();
        audioClient->Release();
        enumerator->Release();
        device->Release();
        std::cout << "Failed to start audio client." << std::endl;
        return -1;   
    }

	// 写入PCM数据到缓冲区
	BYTE* data;
	hr = renderClient->GetBuffer(bufferFrameCount, &data);
	if (SUCCEEDED(hr)) {
		memcpy(data, buffer.data(), buffer.size());
		hr = renderClient->ReleaseBuffer(bufferFrameCount, 0);
	}

	// 等待直到播放完毕
	DWORD taskIndex = 0;
	HANDLE taskHandle = AvSetMmThreadCharacteristics(L"Audio", &taskIndex);

	HANDLE eventHandle = CreateEvent(NULL, FALSE, FALSE, NULL);
	while (true) {
	    DWORD waitResult = WaitForSingleObject(eventHandle, INFINITE);
	    if (waitResult == WAIT_OBJECT_0) {
	        break;
	    }
	}
	CloseHandle(eventHandle);

	// 停止音频流
	audioClient->Stop();

	// 释放资源
	renderClient->Release();
	audioClient->Release();
	device->Release();
	enumerator->Release();

	CoUninitialize();

	return 0;
}

在上述示例中，我们使用了WASAPI API来创建音频客户端对象并初始化音频流。然后，我们从PCM文件中读取数据，并将其写入音频缓冲区。最后，我们启动音频流并等待直到播放完毕。

请确保在编译和运行代码时链接Windows SDK库，同时确保将audio.pcm替换为实际的PCM文件路径。


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