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examples/StreamOnHost/AudioOutputNullSlow.h

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+/*
+  AudioOutput
+  Base class of an audio output player
+  
+  Copyright (C) 2017  Earle F. Philhower, III
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _AUDIOOUTPUTNULLSLOW_H
+#define _AUDIOOUTPUTNULLSLOW_H
+
+#include "AudioOutput.h"
+
+class AudioOutputNullSlow : public AudioOutput 
+{
+  public:
+    AudioOutputNullSlow() { };
+    ~AudioOutputNullSlow() {};
+    virtual bool begin() { samples = 0; startms = millis(); return true; }
+    virtual bool ConsumeSample(int16_t sample[2]) {
+        // return false (= output buffer full)
+        // sometimes to let the main loop running
+        constexpr int everylog2 = 10;
+        if ((++samples & ((1<<everylog2)-1)) == 0) {
+            if (hertz > 0) {
+                // simulate real time
+                delay(1000/(hertz >> everylog2));
+            }
+            return false;
+        }
+        return true;
+    }
+    virtual bool stop() { endms = millis(); return true; };
+    unsigned long GetMilliseconds() { return endms - startms; }
+    int GetSamples() { return samples; }
+    int GetFrequency() { return hertz; }
+
+  protected:
+    unsigned long startms;
+    unsigned long endms;
+    int samples;
+};
+
+#endif
+