From a1283e03cdc44da6e1cd312c3ddc4db0dbdaf7a7 Mon Sep 17 00:00:00 2001
From: Aditya Naik
Date: Mon, 11 Jul 2016 12:59:40 -0400
Subject: initial working build

---
 record.c | 231 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 231 insertions(+)
 create mode 100644 record.c

(limited to 'record.c')

diff --git a/record.c b/record.c
new file mode 100644
index 0000000..41b984d
--- /dev/null
+++ b/record.c
@@ -0,0 +1,231 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <portaudio.h>
+
+
+#define SAMPLE_RATE  (8000)
+#define FRAMES_PER_BUFFER (512)
+#define NUM_CHANNELS    (2)
+#define DITHER_FLAG     (1) 
+#define WRITE_TO_FILE   (1)
+ 
+#define PA_SAMPLE_TYPE  paInt16
+#define SAMPLE_SILENCE  (0)
+#define PRINTF_S_FORMAT "%d"
+
+typedef short SAMPLE;
+
+typedef struct
+{
+    int          frameIndex;  /* Index into sample array. */
+    int          maxFrameIndex;
+    SAMPLE      *recordedSamples;
+}paTestData;
+
+
+static int recordCallback( const void *inputBuffer, void *outputBuffer,
+			   unsigned long framesPerBuffer,
+			   const PaStreamCallbackTimeInfo* timeInfo,
+			   PaStreamCallbackFlags statusFlags,
+			   void *userData ){ 
+    paTestData *data = (paTestData*)userData;
+    const SAMPLE *rptr = (const SAMPLE*)inputBuffer;
+    SAMPLE *wptr = &data->recordedSamples[data->frameIndex * NUM_CHANNELS];
+    long framesToCalc;
+    long i;
+    int finished;
+    unsigned long framesLeft = data->maxFrameIndex - data->frameIndex;
+ 
+    (void) outputBuffer; /* Prevent unused variable warnings. */
+    (void) timeInfo;
+    (void) statusFlags;
+    (void) userData;
+ 
+    if( framesLeft < framesPerBuffer )
+    {
+	framesToCalc = framesLeft;
+	finished = paComplete;
+    }
+    else
+    {
+	framesToCalc = framesPerBuffer;
+	finished = paContinue;
+    }
+ 
+    if( inputBuffer == NULL )
+    {
+	for( i=0; i<framesToCalc; i++ )
+	{
+	    *wptr++ = SAMPLE_SILENCE;  /* left */
+	    if( NUM_CHANNELS == 2 ) *wptr++ = SAMPLE_SILENCE;  /* right */
+	}
+    }
+    else
+    {
+	for( i=0; i<framesToCalc; i++ )
+	{
+	    *wptr++ = *rptr++;  /* left */
+	    if( NUM_CHANNELS == 2 ) *wptr++ = *rptr++;  /* right */
+	}
+    }
+    data->frameIndex += framesToCalc;
+    return finished;
+}
+static int playCallback( const void *inputBuffer, void *outputBuffer,
+                          unsigned long framesPerBuffer,
+                          const PaStreamCallbackTimeInfo* timeInfo,
+                          PaStreamCallbackFlags statusFlags,
+                          void *userData )
+ {
+     paTestData *data = (paTestData*)userData;
+     SAMPLE *rptr = &data->recordedSamples[data->frameIndex * NUM_CHANNELS];
+     SAMPLE *wptr = (SAMPLE*)outputBuffer;
+     unsigned int i;
+     int finished;
+     unsigned int framesLeft = data->maxFrameIndex - data->frameIndex;
+ 
+     (void) inputBuffer; /* Prevent unused variable warnings. */
+     (void) timeInfo;
+     (void) statusFlags;
+     (void) userData;
+ 
+     if( framesLeft < framesPerBuffer )
+     {
+         /* final buffer... */
+         for( i=0; i<framesLeft; i++ )
+         {
+             *wptr++ = *rptr++;  /* left */
+             if( NUM_CHANNELS == 2 ) *wptr++ = *rptr++;  /* right */
+         }
+         for( ; i<framesPerBuffer; i++ )
+         {
+             *wptr++ = 0;  /* left */
+             if( NUM_CHANNELS == 2 ) *wptr++ = 0;  /* right */
+         }
+         data->frameIndex += framesLeft;
+         finished = paComplete;
+     }
+     else
+     {
+         for( i=0; i<framesPerBuffer; i++ )
+         {
+             *wptr++ = *rptr++;  /* left */
+             if( NUM_CHANNELS == 2 ) *wptr++ = *rptr++;  /* right */
+         }
+         data->frameIndex += framesPerBuffer;
+         finished = paContinue;
+     }
+     return finished;
+ }
+ 
+int record(int NUM_SECONDS){
+    PaStream*           stream;	       
+    PaError             err = paNoError;
+    PaStreamParameters  inputParameters, outputParameters;   
+    paTestData          data;
+    int                 numBytes;
+    int                 i;
+    SAMPLE              max, val;
+    int                 totalFrames;
+    double              average;
+    int                 numSamples;     
+    data.maxFrameIndex = totalFrames = NUM_SECONDS * SAMPLE_RATE;
+    data.frameIndex = 0;
+    numSamples = totalFrames * NUM_CHANNELS;
+    numBytes = numSamples * sizeof(SAMPLE);
+    data.recordedSamples = (SAMPLE *) malloc( numBytes ); 
+    if( data.recordedSamples == NULL )
+    {
+	printf("Could not allocate record array.\n");
+	goto done;
+    }
+    for( i=0; i<numSamples; i++ ) data.recordedSamples[i] = 0;
+ 
+    err = Pa_Initialize();
+    if( err != paNoError ) goto done;
+ 
+    inputParameters.device = Pa_GetDefaultInputDevice(); 
+    if (inputParameters.device == paNoDevice) {
+	fprintf(stderr,"Error: No default input device.\n");
+	goto done;
+    }
+    inputParameters.channelCount = 2;                    
+    inputParameters.sampleFormat = PA_SAMPLE_TYPE;
+    inputParameters.suggestedLatency = Pa_GetDeviceInfo( inputParameters.device )->defaultLowInputLatency;
+    inputParameters.hostApiSpecificStreamInfo = NULL;
+ 
+    /* Record some audio. -------------------------------------------- */    
+    err = Pa_OpenStream(
+	&stream,
+	&inputParameters,
+	NULL,                  /* &outputParameters, */
+	SAMPLE_RATE,
+	FRAMES_PER_BUFFER,
+	paClipOff,      /* we won't output out of range samples so don't bother clipping them */
+	recordCallback,
+	&data );
+    if( err != paNoError ) goto done;
+ 
+    err = Pa_StartStream( stream );
+    if( err != paNoError ) goto done;
+    printf("=== NOW RECORDING ===\n"); fflush(stdout);
+ 
+    while( ( err = Pa_IsStreamActive( stream ) ) == 1 )
+    {
+	Pa_Sleep(1000);
+	printf("index = %d\n", data.frameIndex ); fflush(stdout);
+    }
+    if( err < 0 ) goto done;
+ 
+    err = Pa_CloseStream( stream );
+    if( err != paNoError ) goto done;
+ 
+    /* Measure maximum peak amplitude. */
+    max = 0;
+    average = 0.0;
+    for( i=0; i<numSamples; i++ )
+    {
+	val = data.recordedSamples[i];
+	if( val < 0 ) val = -val; /* ABS */
+	if( val > max )
+	{
+	    max = val;
+	}
+	average += val;
+    }
+ 
+    average = average / (double)numSamples;
+ 
+    /* printf("sample max amplitude = "PRINTF_S_FORMAT"\n", max ); */
+    /* printf("sample average = %lf\n", average ); */
+ 
+    /* Write recorded data to a file. */
+#if WRITE_TO_FILE
+    {
+	FILE  *fid;
+	fid = fopen("recorded.raw", "wb");
+	if( fid == NULL )
+	{
+	    printf("Could not open file.");
+	}
+	else
+	{
+	    fwrite( data.recordedSamples, NUM_CHANNELS * sizeof(SAMPLE), totalFrames, fid );
+	    fclose( fid );
+	    /* printf("Wrote data to 'recorded.raw'\n"); */
+	}
+    }
+#endif
+   
+done:
+    Pa_Terminate();
+    if( data.recordedSamples )       /* Sure it is NULL or valid. */
+	free( data.recordedSamples );
+    if( err != paNoError )
+    {
+	fprintf( stderr, "An error occured while using the portaudio stream\n" );
+	fprintf( stderr, "Error number: %d\n", err );
+	fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
+	err = 1;          /* Always return 0 or 1, but no other return codes. */
+    }
+}
-- 
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