Adding buffer and testing demod functionality

CMakeLists.txt

@@ -72,6 +72,7 @@ else (DEFINED WIN32)
   link_directories(${RTLSDR_LIB})
   set(FFTW_LIB fftw3)
   find_package (OpenAL)
+  include_directories ( ${OPENAL_INCLUDE_DIR} )
 endif (DEFINED WIN32)
 
 

src/CubicSDRDefs.h

@@ -1,8 +1,8 @@
 #pragma once
 
-#define BUF_SIZE (16 * 32 * 512)
+#define BUF_SIZE (16 * 32 * 256)
 #define SRATE 2500000
-#define FFT_SIZE 8192
+#define FFT_SIZE 4096
 
 #define DEFAULT_FREQ 105700000
 

src/Demodulate.cpp

@@ -538,8 +538,8 @@ Demodulate::Demodulate() {
     mode_demod = &fm_demod;
     rate_in = 170000;
     rate_out = 170000;
-    rate_out2 = 32000;
-    output.rate = 32000;
+    rate_out2 = 44000;
+    output.rate = 44000;
     custom_atan = 1;
 //    post_downsample = 4;
     deemph = 1;
@@ -547,6 +547,7 @@ Demodulate::Demodulate() {
 
     int capture_freq;
 
+    // downsample = (SRATE / rate_in) + 1;
     downsample = (SRATE / rate_in) + 1;
     if (downsample_passes) {
         downsample_passes = (int) log2(downsample) + 1;
@@ -589,6 +590,7 @@ Demodulate::Demodulate() {
     output.results[1].trycond = 1;
     output.results[1].buf = NULL;
 
+
 //    controller.freqs[0] = 100000000;
 //    controller.freq_len = 0;
 //    controller.edge = 0;
@@ -615,7 +617,7 @@ Demodulate::Demodulate() {
 //                }
 //                break;
 
-    rate_in *= post_downsample;
+    // rate_in *= post_downsample;
     if (!output.rate) {
         output.rate = rate_out;
     }

src/PrimaryGLContext.cpp

@@ -132,16 +132,16 @@ TestGLCanvas::TestGLCanvas(wxWindow *parent, int *attribList) :
     alGenSources(1, &source);
 
     // prime the buffers
-    ALuint buffer_init[AL_BUFFER_SIZE];
+    int16_t buffer_init[AL_BUFFER_SIZE];
 
     for (int i = 0; i < AL_BUFFER_SIZE; i++) {
-        buffer_init[i] = 32767;
+        buffer_init[i] = 0;
     }
 
     format = AL_FORMAT_MONO16;
-    alBufferData(buffers[0], format, buffer_init, AL_BUFFER_SIZE, 32000);
-    alBufferData(buffers[1], format, buffer_init, AL_BUFFER_SIZE, 32000);
-    alBufferData(buffers[2], format, buffer_init, AL_BUFFER_SIZE, 32000);
+    for (int i = 0; i < AL_NUM_BUFFERS; i++) {
+      alBufferData(buffers[i], format, buffer_init, AL_BUFFER_SIZE, demod.output.rate);
+    }
     if (alGetError() != AL_NO_ERROR) {
         std::cout << "Error priming :(\n";
     }
@@ -228,30 +228,39 @@ void TestGLCanvas::setData(std::vector<signed char> *data) {
         ALint val;
         ALuint buffer;
 
+        alGetSourcei(source, AL_SOURCE_STATE, &val);
+        if (val != AL_PLAYING) {
+            alSourcePlay(source);
+        }
+
+        // std::cout << "buffer: " << demod.output_target->len << "@" << frequency << std::endl;
+        std::vector<ALuint> *newBuffer = new std::vector<ALuint>;
+        newBuffer->resize(demod.output_target->len);
+        memcpy(&(*newBuffer)[0],demod.output_target->buf,demod.output_target->len*2);
+        audio_queue.push(newBuffer);
+
+
         frequency = demod.output.rate;
 
-        alGetSourcei(source, AL_BUFFERS_PROCESSED, &val);
-        if (val > 0) {
-            std::cout << "buffer: " << demod.output_target->len << "@" << frequency << std::endl;
-//            std::vector<ALuint> al_buffer;
-//            al_buffer.resize(demod.lp_len);
-
-//            for (int i = 0, iMax = demod.lp_len; i < iMax; i++) {
-//                al_buffer[i] = demod.lowpassed[i] + 32767.0;
-//            }
-
+        while (audio_queue.size()>8) {
+            alGetSourcei(source, AL_BUFFERS_PROCESSED, &val);
+            if (val <= 0) {
+              break;
+            }
+          
+            std::vector<ALuint> *nextBuffer = audio_queue.front();
+            
             alSourceUnqueueBuffers(source, 1, &buffer);
-            alBufferData(buffer, format, demod.output_target->buf, demod.output_target->len*2, frequency);
+            alBufferData(buffer, format, &(*nextBuffer)[0], nextBuffer->size()*2, frequency);
             alSourceQueueBuffers(source, 1, &buffer);
 
+            audio_queue.pop();
+            
+            delete nextBuffer;
+
             if (alGetError() != AL_NO_ERROR) {
                 std::cout << "Error buffering :(\n";
             }
-
-        }
-        alGetSourcei(source, AL_SOURCE_STATE, &val);
-        if (val != AL_PLAYING) {
-            alSourcePlay(source);
         }
 
         if (spectrum_points.size() < FFT_SIZE * 2) {

src/PrimaryGLContext.h

@@ -4,15 +4,22 @@
 #include "wx/timer.h"
 
 #include <vector>
+#include <queue>
+
 #include "CubicSDRDefs.h"
 #include "fftw3.h"
 
 #include "Demodulate.h"
 
+#ifdef WIN32
 #include <AL/al.h>
 #include <AL/alc.h>
+#else
+#include <OpenAL/al.h>
+#include <OpenAL/alc.h>
+#endif
 
-#define AL_NUM_BUFFERS 3
+#define AL_NUM_BUFFERS 16
 #define AL_BUFFER_SIZE 4096
 
 class PrimaryGLContext: public wxGLContext {
@@ -52,6 +59,8 @@ private:
     std::vector<float> fft_result_ma;
     std::vector<float> fft_result_maa;
 
+    std::queue< std::vector <ALuint> * > audio_queue;
+
     Demodulate demod;
 
     ALCdevice *dev;
@@ -60,7 +69,6 @@ private:
     ALuint source, buffers[AL_NUM_BUFFERS];
     ALuint frequency;
     ALenum format;
-    unsigned char *buf;
 
 wxDECLARE_EVENT_TABLE();
 };