Make FakeCapture capable of outputting audio (a simple sine tone).

[bmusb] / bmusb / fake_capture.h

diff --git a/bmusb/fake_capture.h b/bmusb/fake_capture.h
index 48dca063ae7d6b18e21e3554478b4aa1532f1000..17982ea50e6d0ff3071f6d01f9240ede4e9ed993 100644 (file)
--- a/bmusb/fake_capture.h
+++ b/bmusb/fake_capture.h
@@ -12,7 +12,7 @@ namespace bmusb {
 class FakeCapture : public CaptureInterface
 {
 public:
-       FakeCapture(unsigned width, unsigned height, unsigned fps, unsigned audio_frequency, int card_index);
+       FakeCapture(unsigned width, unsigned height, unsigned fps, unsigned audio_sample_frequency, int card_index, bool has_audio = false);
        ~FakeCapture();
 
        // CaptureInterface.
@@ -79,10 +79,17 @@ public:
 
 private:
        void producer_thread_func();
+       void make_tone(int32_t *out, unsigned num_stereo_samples);
 
-       unsigned width, height, fps, audio_frequency;
+       unsigned width, height, fps, audio_sample_frequency;
        uint8_t y, cb, cr;
 
+       // sin(2 * pi * f / F) and similar for cos. Used for fast sine generation.
+       // Zero when no audio.
+       float audio_sin = 0.0f, audio_cos = 0.0f;
+       float audio_real = 0.0f, audio_imag = 0.0f;  // Current state of the audio phaser.
+       float audio_ref_level;
+
        bool has_dequeue_callbacks = false;
        std::function<void()> dequeue_init_callback = nullptr;
        std::function<void()> dequeue_cleanup_callback = nullptr;