From 4c0869841d9ee6f8cc567b3e9eb2249193fc9f83 Mon Sep 17 00:00:00 2001
From: Kelly Rauchenberger <fefferburbia@gmail.com>
Date: Thu, 12 Mar 2015 16:43:49 -0400
Subject: Play a sound when you jump

---
 src/components.cpp |   3 ++
 src/game.cpp       |   2 +-
 src/main.cpp       |   3 ++
 src/muxer.cpp      | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/muxer.h        |   8 ++++
 5 files changed, 126 insertions(+), 1 deletion(-)
 create mode 100644 src/muxer.cpp
 create mode 100644 src/muxer.h

(limited to 'src')

diff --git a/src/components.cpp b/src/components.cpp
index e2eb2ed..941d02e 100644
--- a/src/components.cpp
+++ b/src/components.cpp
@@ -1,5 +1,6 @@
 #include "components.h"
 #include "game.h"
+#include "muxer.h"
 
 // User movement component
 
@@ -215,6 +216,8 @@ void PlayerPhysicsComponent::receive(Game&, Entity& entity, const Message& msg)
     velocity.second = 0.0;
   } else if (msg.type == Message::Type::jump)
   {
+    playSound("../res/Randomize87.wav");
+    
     velocity.second = jump_velocity;
     accel.second = jump_gravity;
   } else if (msg.type == Message::Type::stopJump)
diff --git a/src/game.cpp b/src/game.cpp
index 043c82b..50c01f5 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -160,5 +160,5 @@ void Game::loadGame(const Map& curMap)
 
 void Game::schedule(int frames, std::function<void ()>&& callback)
 {
-  scheduled.emplace(begin(scheduled), frames, callback);
+  scheduled.emplace_front(frames, callback);
 }
diff --git a/src/main.cpp b/src/main.cpp
index e37c2dd..96eb7da 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3,12 +3,14 @@
 #include "renderer.h"
 #include <cstdlib>
 #include "game.h"
+#include "muxer.h"
 
 int main()
 {
   srand(time(NULL));
   
   GLFWwindow* window = initRenderer();
+  initMuxer();
   
   // Put this in a block so game goes out of scope before we destroy the renderer
   {
@@ -16,6 +18,7 @@ int main()
     game.execute(window);
   }
   
+  destroyMuxer();
   destroyRenderer();
   
   return 0;
diff --git a/src/muxer.cpp b/src/muxer.cpp
new file mode 100644
index 0000000..0844faa
--- /dev/null
+++ b/src/muxer.cpp
@@ -0,0 +1,111 @@
+#include "muxer.h"
+#include <cstdlib>
+#include <sndfile.h>
+#include <portaudio.h>
+#include <list>
+
+#define SAMPLE_RATE (44100)
+
+class Sound {
+  public:
+    Sound(const char* filename);
+    ~Sound();
+    
+    float* ptr;
+    unsigned long pos;
+    unsigned long len;
+};
+
+struct Muxer {
+  std::list<Sound> playing;
+  PaStream* stream;
+};
+
+inline void dealWithPaError(PaError err)
+{
+  if (err != paNoError)
+  {
+    printf("PortAudio error: %s\n", Pa_GetErrorText(err));
+    exit(-1);
+  }
+}
+
+int paMuxerCallback(const void*, void* outputBuffer, unsigned long framesPerBuffer, const PaStreamCallbackTimeInfo*, PaStreamCallbackFlags, void* userData)
+{
+  Muxer* muxer = (Muxer*) userData;
+  float* out = (float*) outputBuffer;
+  
+  for (unsigned long i = 0; i<framesPerBuffer; i++)
+  {
+    unsigned long curAmount = 0;
+    *out = 0;
+    
+    for (auto& sound : muxer->playing)
+    {
+      if (sound.pos < sound.len)
+      {
+        *out *= curAmount++;
+        *out += sound.ptr[sound.pos++];
+        *out /= (float) curAmount;
+      }
+    }
+    
+    out++;
+  }
+  
+  return 0;
+}
+
+static Muxer* muxer;
+
+void initMuxer()
+{
+  muxer = new Muxer();
+  
+  dealWithPaError(Pa_Initialize());
+  dealWithPaError(Pa_OpenDefaultStream(&(muxer->stream), 0, 1, paFloat32, SAMPLE_RATE, paFramesPerBufferUnspecified, paMuxerCallback, muxer));
+  dealWithPaError(Pa_StartStream(muxer->stream));
+}
+
+void destroyMuxer()
+{
+  dealWithPaError(Pa_AbortStream(muxer->stream));
+  dealWithPaError(Pa_CloseStream(muxer->stream));
+  dealWithPaError(Pa_Terminate());
+  
+  delete muxer;
+  muxer = 0;
+}
+
+void playSound(const char* filename)
+{
+  // First, clear out any sounds that have finished playing
+  muxer->playing.remove_if([] (Sound& value) { return value.pos >= value.len; });
+  
+  // Then, add the new sound
+  muxer->playing.emplace_back(filename);
+}
+
+Sound::Sound(const char* filename)
+{
+  SF_INFO info;
+  SNDFILE* file = sf_open(filename, SFM_READ, &info);
+  if (file == nullptr)
+  {
+    printf("LibSndFile error: %s\n", sf_strerror(file));
+    exit(-1);
+  }
+  
+  ptr = (float*) malloc(info.frames * info.channels * sizeof(float));
+  len = info.frames * info.channels;
+  pos = 0;
+  
+  sf_readf_float(file, ptr, info.frames);
+  
+  sf_close(file);
+}
+
+Sound::~Sound()
+{
+  free(ptr);
+}
diff --git a/src/muxer.h b/src/muxer.h
new file mode 100644
index 0000000..b0f5378
--- /dev/null
+++ b/src/muxer.h
@@ -0,0 +1,8 @@
+#ifndef MUXER_H
+#define MUXER_H
+
+void initMuxer();
+void destroyMuxer();
+void playSound(const char* filename);
+
+#endif
-- 
cgit 1.4.1