node.js - 在哪里检索音频文件？ — Arduino-光子项目

Question

我刚开始接触电子产品，并使用基于Arduino的Spark Photon进行了一个项目。项目网站在这里:http://hackster.io/middleca/sending-sound-over-the-internet

我将以下两个文件(.ino和.js)上传到Photon，然后应捕获并传输声音(我直接假设)。我期望将创建一个test.wav。但是，在哪里可以找到此文件，以便检查是否一切正常？

main.ino文件:

#define MICROPHONE_PIN A5
#define AUDIO_BUFFER_MAX 8192

int audioStartIdx = 0, audioEndIdx = 0;
uint16_t audioBuffer[AUDIO_BUFFER_MAX];
uint16_t txBuffer[AUDIO_BUFFER_MAX];

// version without timers
unsigned long lastRead = micros();
char myIpAddress[24];

TCPClient audioClient;
TCPClient checkClient;
TCPServer audioServer = TCPServer(3443);

void setup() {
    Serial.begin(115200);
    pinMode(MICROPHONE_PIN, INPUT);

    // so we know where to connect, try:
    // particle get MY_DEVICE_NAME ipAddress

    Spark.variable("ipAddress", myIpAddress, STRING);
    IPAddress myIp = WiFi.localIP();
    sprintf(myIpAddress, "%d.%d.%d.%d", myIp[0], myIp[1], myIp[2], myIp[3]);


    // 1/8000th of a second is 125 microseconds
    audioServer.begin();

    lastRead = micros();
}

void loop() {
    checkClient = audioServer.available();
    if (checkClient.connected()) {
        audioClient = checkClient; 
    }

    //listen for 100ms, taking a sample every 125us,
    //and then send that chunk over the network.
    listenAndSend(100);
}

void listenAndSend(int delay) {
    unsigned long startedListening = millis();

    while ((millis() - startedListening) < delay) {
        unsigned long time = micros();

        if (lastRead > time) {
            // time wrapped?
            //lets just skip a beat for now, whatever.
            lastRead = time;
        }

        //125 microseconds is 1/8000th of a second
        if ((time - lastRead) > 125) {
            lastRead = time;
            readMic();
        }
    }
    sendAudio();
}


// Callback for Timer 1
void readMic(void) {
    uint16_t value = analogRead(MICROPHONE_PIN);
    if (audioEndIdx >= AUDIO_BUFFER_MAX) {
        audioEndIdx = 0;
    }
    audioBuffer[audioEndIdx++] = value;
}

void copyAudio(uint16_t *bufferPtr) {
    //if end is after start, read from start->end
    //if end is before start, then we wrapped, read from start->max, 0->end

    int endSnapshotIdx = audioEndIdx;
    bool wrapped = endSnapshotIdx < audioStartIdx;
    int endIdx = (wrapped) ? AUDIO_BUFFER_MAX : endSnapshotIdx;
    int c = 0;

    for(int i=audioStartIdx;i<endIdx;i++) {
        // do a thing
        bufferPtr[c++] = audioBuffer[i];
    }

    if (wrapped) {
        //we have extra
        for(int i=0;i<endSnapshotIdx;i++) {
            // do more of a thing.
            bufferPtr[c++] = audioBuffer[i];
        }
    }

    //and we're done.
    audioStartIdx = audioEndIdx;

    if (c < AUDIO_BUFFER_MAX) {
        bufferPtr[c] = -1;
    }
}

// Callback for Timer 1
void sendAudio(void) {
    copyAudio(txBuffer);

    int i=0;
    uint16_t val = 0;

    if (audioClient.connected()) {
       write_socket(audioClient, txBuffer);
    }
    else {
        while( (val = txBuffer[i++]) < 65535 ) {
            Serial.print(val);
            Serial.print(',');
        }
        Serial.println("DONE");
    }
}


// an audio sample is 16bit, we need to convert it to bytes for sending over the network
void write_socket(TCPClient socket, uint16_t *buffer) {
    int i=0;
    uint16_t val = 0;

    int tcpIdx = 0;
    uint8_t tcpBuffer[1024];

    while( (val = buffer[i++]) < 65535 ) {
        if ((tcpIdx+1) >= 1024) {
            socket.write(tcpBuffer, tcpIdx);
            tcpIdx = 0;
        }

        tcpBuffer[tcpIdx] = val & 0xff;
        tcpBuffer[tcpIdx+1] = (val >> 8);
        tcpIdx += 2;
    }

    // any leftovers?
    if (tcpIdx > 0) {
        socket.write(tcpBuffer, tcpIdx);
    }
}

和waveRecorder.js文件:

// make sure you have Node.js Installed!
// Get the IP address of your photon, and put it here:

// CLI command to get your photon's IP address
//
// particle get MY_DEVICE_NAME ipAddress

// Put your IP here!
var settings = {
    ip: "192.168.0.54",
    port: 3443
};

/**
 * Created by middleca on 7/18/15.
 */

//based on a sample from here
//  http://stackoverflow.com/questions/19548755/nodejs-write-binary-data-into-writablestream-with-buffer

var fs = require("fs");

var samplesLength = 1000;
var sampleRate = 8000;

var outStream = fs.createWriteStream("test.wav");

var writeHeader = function() {
    var b = new Buffer(1024);
    b.write('RIFF', 0);
    /* file length */
    b.writeUInt32LE(32 + samplesLength * 2, 4);
    //b.writeUint32LE(0, 4);

    b.write('WAVE', 8);
    /* format chunk identifier */
    b.write('fmt ', 12);

    /* format chunk length */
    b.writeUInt32LE(16, 16);

    /* sample format (raw) */
    b.writeUInt16LE(1, 20);

    /* channel count */
    b.writeUInt16LE(1, 22);

    /* sample rate */
    b.writeUInt32LE(sampleRate, 24);

    /* byte rate (sample rate * block align) */
    b.writeUInt32LE(sampleRate * 2, 28);

    /* block align (channel count * bytes per sample) */
    b.writeUInt16LE(2, 32);

    /* bits per sample */
    b.writeUInt16LE(16, 34);

    /* data chunk identifier */
    b.write('data', 36);

    /* data chunk length */
    //b.writeUInt32LE(40, samplesLength * 2);
    b.writeUInt32LE(0, 40);


    outStream.write(b.slice(0, 50));
};





writeHeader(outStream);





var net = require('net');
console.log("connecting...");
client = net.connect(settings.port, settings.ip, function () {
    client.setNoDelay(true);

    client.on("data", function (data) {
        try {
            console.log("GOT DATA");
            outStream.write(data);
            //outStream.flush();
            console.log("got chunk of " + data.toString('hex'));
        }
        catch (ex) {
            console.error("Er!" + ex);
        }
    });
});




setTimeout(function() {
    console.log('recorded for 10 seconds');
    client.end();
    outStream.end();
    process.exit(0);
}, 10 * 1000);

Answer 1

盗贼!这样的初学者的问题...太不值得了!

无论如何，我会坚定地告诉你答案。

首先，您误会了:.ino文件应该转到Photon，waveRecorder.js文件应该存储在您的计算机(或服务器)上，并在需要检索音频时调用。正如您可以阅读的代码所示，.ino文件确保每毫秒检查一次是否要连接的内容，如果连接成功，它将把声音流到与waveRecorder.js相同位置存储的wav.file中。文件。启动waveRecorder.js时会发生“某事想要连接”的情况。确保已安装节点。

因此，总结一下:

将两个文件(main.ino和waveRecorder.js)下载到计算机中的文件夹../xx/folderName

中

然后使用光子的IPAddress在两个文件中配置IPAddress

将main.ino上载到光子(在终端中键入'particle flash abcdefgh123456578“xx /../ folderName / main.ino”“)

然后通过在终端中键入“node“xx /../ folderName / waveRecorder.js””来运行waveRecorder.js。

那应该做到的。即使我也能正常工作:)