/
main.go
234 lines (195 loc) · 6.29 KB
/
main.go
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package main
import (
"encoding/binary"
"fmt"
"math"
"os"
"os/signal"
"sync"
"syscall"
"time"
"unsafe"
"github.com/xray-bit/wasapi/audioclient"
"github.com/xray-bit/wasapi/com"
"github.com/xray-bit/wasapi/mmdevice"
"golang.org/x/sys/windows"
)
const CLSCTX_ALL = windows.CLSCTX_INPROC_SERVER | windows.CLSCTX_INPROC_HANDLER | windows.CLSCTX_LOCAL_SERVER | windows.CLSCTX_REMOTE_SERVER
const (
REFTIMES_PER_SEC = 10000000
REFTIMES_PER_MILLISEC = 10000
)
var wg sync.WaitGroup
func main() {
var (
v unsafe.Pointer
enumerator *mmdevice.IMMDeviceEnumerator
devices *mmdevice.IMMDeviceCollection
device *mmdevice.IMMDevice
cnt uint
id string
properties *com.IPropertyStore
propVar com.PROPVARIANT
audioClient *audioclient.IAudioClient
captureClient *audioclient.IAudioCaptureClient
format *audioclient.WAVEFORMATEXTENSIBLE
hnsActualDuration uint64
bufferFrameCount uint32
quit chan int
sigChan chan os.Signal
err error
)
CLSID_MMDeviceEnumerator := mmdevice.CLSID_MMDeviceEnumerator()
IID_IMMDeviceEnumerator := mmdevice.IID_IMMDeviceEnumerator()
IID_IAudioCaptureClient := audioclient.IID_IAudioCaptureClient()
// 初始化 COM 库
if err = com.CoInitializeEx(0, windows.COINIT_APARTMENTTHREADED); err != nil {
panic(err)
}
defer com.CoUninitialize()
// 创建 IMMDeviceEnumerator 实例
if v, err = com.CoCreateInstance(&CLSID_MMDeviceEnumerator, nil, CLSCTX_ALL, &IID_IMMDeviceEnumerator); err != nil {
panic(err)
}
enumerator = mmdevice.ToType[mmdevice.IMMDeviceEnumerator](v)
defer enumerator.Release()
// 枚举音频端点设备
if devices, err = enumerator.EnumAudioEndpoints(mmdevice.ERender, mmdevice.DEVICE_STATE_ACTIVE); err != nil {
panic(err)
}
defer devices.Release()
// 获取设备数量
if cnt, err = devices.GetCount(); err != nil {
panic(err)
}
fmt.Println("Device Counts:", cnt)
if cnt == 0 {
return
}
// 获取索引为 0 的设备
if device, err = devices.Item(0); err != nil {
panic(err)
}
defer device.Release()
if id, err = device.GetId(); err != nil {
panic(err)
}
fmt.Println("Device[0] ID:", id)
if properties, err = device.OpenPropertyStore(com.STGM_READ); err != nil {
panic(err)
}
defer properties.Release()
// 获取设备友好名称
if propVar, err = properties.GetValue(com.PKEY_Device_FriendlyName()); err != nil {
panic(err)
}
fmt.Println("Device[0] Name:", propVar.PwszValString())
// 创建音频客户端实例
if v, err = device.Activate(audioclient.IID_IAudioClient(), CLSCTX_ALL, nil); err != nil {
panic(err)
}
audioClient = audioclient.ToType[audioclient.IAudioClient](v)
defer audioClient.Release()
// 获取设备格式
if format, err = audioClient.GetMixFormat(); err != nil {
panic(err)
}
defer com.CoTaskMemFree(unsafe.Pointer(format))
showWaveFormat(format)
// 初始化音频流
if err = audioClient.Initialize(
audioclient.AUDCLNT_SHAREMODE_SHARED,
audioclient.AUDCLNT_STREAMFLAGS_LOOPBACK,
REFTIMES_PER_SEC, 0, format, nil,
); err != nil {
panic(err)
}
// 获取音频客户端缓冲区大小
if bufferFrameCount, err = audioClient.GetBufferSize(); err != nil {
panic(err)
}
// 访问捕捉流服务
if v, err = audioClient.GetService(&IID_IAudioCaptureClient); err != nil {
panic(err)
}
captureClient = audioclient.ToType[audioclient.IAudioCaptureClient](v)
defer captureClient.Release()
// 计算实际的采样时间
hnsActualDuration = uint64(REFTIMES_PER_SEC) * uint64(bufferFrameCount) / uint64(format.Format().SamplesPerSec())
if err = audioClient.Start(); err != nil {
panic(err)
}
defer audioClient.Stop()
quit = make(chan int)
sigChan = make(chan os.Signal)
signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
wg.Add(1)
// start process
go processCapture(captureClient, format, hnsActualDuration, quit)
<-sigChan
close(quit)
// wait for quit
wg.Wait()
}
func processCapture(client *audioclient.IAudioCaptureClient, format *audioclient.WAVEFORMATEXTENSIBLE, hnsDuration uint64, quit <-chan int) {
var (
packetLen uint32
data []byte
numFramesAvailable uint32
flags uint32
err error
)
defer wg.Done()
defer func() {
fmt.Println("Exit Capture")
}()
for {
select {
case <-quit:
return
case <-time.After(time.Duration(hnsDuration/REFTIMES_PER_MILLISEC/2) * time.Millisecond):
}
if packetLen, err = client.GetNextPacketSize(); err != nil {
panic(err)
}
for packetLen != 0 {
if data, numFramesAvailable, flags, _, _, err = client.GetBuffer(); err != nil {
panic(err)
}
// 这里打印只是方便呈现获取到的音频内容
// 可以在此按业务需求处理音频内容
// 因为此处判断了静音,所以如果卡在了这里,可以尝试播放一些音乐
if flags&audioclient.AUDCLNT_BUFFERFLAGS_SILENT == 0 &&
format.Format().BitsPerSample() == 32 &&
format.Format().FormatTag() == audioclient.WAVE_FORMAT_EXTENSIBLE &&
format.SubFormatTag() == audioclient.WAVE_FORMAT_IEEE_FLOAT {
for i := 0; i < int(numFramesAvailable/uint32(format.Format().BlockAlign()))/int(format.Format().Channels()); i++ {
for j := 0; j < int(format.Format().Channels()); j++ {
fmt.Printf("CH%d: %f\t", j, math.Float32frombits(binary.LittleEndian.Uint32(data[i*int(format.Format().Channels())*4:i*int(format.Format().Channels())*4+4])))
}
fmt.Println()
}
}
if err = client.ReleaseBuffer(numFramesAvailable); err != nil {
panic(err)
}
if packetLen, err = client.GetNextPacketSize(); err != nil {
panic(err)
}
}
}
}
func showWaveFormat(wf *audioclient.WAVEFORMATEXTENSIBLE) {
fmt.Println("FormatTag:\t", wf.Format().FormatTag())
fmt.Println("Channels:\t", wf.Format().Channels())
fmt.Println("SamplesPerSec:\t", wf.Format().SamplesPerSec())
fmt.Println("AvgBytesPerSec:\t", wf.Format().AvgBytesPerSec())
fmt.Println("BlockAlign:\t", wf.Format().BlockAlign())
fmt.Println("BitsPerSample:\t", wf.Format().BitsPerSample())
fmt.Println("CbSize:\t\t", wf.Format().CbSize())
if wf.Format().CbSize() == 22 {
fmt.Println("Samples:\t", wf.Samples())
fmt.Printf("ChannelMask:\t 0x%08X\n", wf.ChannelMask())
fmt.Println("SubFormat:\t", wf.SubFormatTag())
}
}