From be97583f00997fa918a15d0164190ae6876d0571 Mon Sep 17 00:00:00 2001
From: raysan5 <raysan5@gmail.com>
Date: Mon, 29 Aug 2016 11:17:58 +0200
Subject: [PATCH] Added function: UpdateSound()

---
 src/audio.c  | 28 ++++++++++++++++++++++++++++
 src/audio.h  |  1 +
 src/raylib.h |  2 ++
 3 files changed, 31 insertions(+)

diff --git a/src/audio.c b/src/audio.c
index 1772196f..3bace5f7 100644
--- a/src/audio.c
+++ b/src/audio.c
@@ -284,6 +284,7 @@ Sound LoadSoundFromWave(Wave wave)
 
         sound.source = source;
         sound.buffer = buffer;
+        sound.format = format;
     }
 
     return sound;
@@ -409,6 +410,33 @@ void UnloadSound(Sound sound)
     TraceLog(INFO, "[SND ID %i][BUFR ID %i] Unloaded sound data from RAM", sound.source, sound.buffer);
 }
 
+// Update sound buffer with new data
+// NOTE: data must match sound.format
+void UpdateSound(Sound sound, void *data, int numSamples)
+{
+    ALint sampleRate, sampleSize, channels;
+    alGetBufferi(sound.buffer, AL_FREQUENCY, &sampleRate);
+    alGetBufferi(sound.buffer, AL_BITS, &sampleSize);       // It could also be retrieved from sound.format
+    alGetBufferi(sound.buffer, AL_CHANNELS, &channels);     // It could also be retrieved from sound.format
+    
+    TraceLog(DEBUG, "UpdateSound() : AL_FREQUENCY: %i", sampleRate);
+    TraceLog(DEBUG, "UpdateSound() : AL_BITS: %i", sampleSize);
+    TraceLog(DEBUG, "UpdateSound() : AL_CHANNELS: %i", channels);
+
+    unsigned int dataSize = numSamples*sampleSize/8;        // Size of data in bytes
+    
+    alSourceStop(sound.source);                 // Stop sound
+    alSourcei(sound.source, AL_BUFFER, 0);      // Unbind buffer from sound to update
+    //alDeleteBuffers(1, &sound.buffer);          // Delete current buffer data
+    //alGenBuffers(1, &sound.buffer);             // Generate new buffer
+
+    // Upload new data to sound buffer
+    alBufferData(sound.buffer, sound.format, data, dataSize, sampleRate);
+
+    // Attach sound buffer to source again
+    alSourcei(sound.source, AL_BUFFER, sound.buffer);
+}
+
 // Play a sound
 void PlaySound(Sound sound)
 {
diff --git a/src/audio.h b/src/audio.h
index 4ee9559e..923492ca 100644
--- a/src/audio.h
+++ b/src/audio.h
@@ -110,6 +110,7 @@ bool IsAudioDeviceReady(void);                                  // Check if audi
 Sound LoadSound(char *fileName);                                // Load sound to memory
 Sound LoadSoundFromWave(Wave wave);                             // Load sound to memory from wave data
 Sound LoadSoundFromRES(const char *rresName, int resId);        // Load sound to memory from rRES file (raylib Resource)
+void UpdateSound(Sound sound, void *data, int numSamples);      // Update sound buffer with new data
 void UnloadSound(Sound sound);                                  // Unload sound
 void PlaySound(Sound sound);                                    // Play a sound
 void PauseSound(Sound sound);                                   // Pause a sound
diff --git a/src/raylib.h b/src/raylib.h
index 68cddc5a..d295ef90 100644
--- a/src/raylib.h
+++ b/src/raylib.h
@@ -486,6 +486,7 @@ typedef struct Ray {
 typedef struct Sound {
     unsigned int source;    // OpenAL audio source id
     unsigned int buffer;    // OpenAL audio buffer id
+    int format;             // OpenAL audio format specifier
 } Sound;
 
 // Wave type, defines audio wave data
@@ -908,6 +909,7 @@ RLAPI bool IsAudioDeviceReady(void);                                  // Check i
 RLAPI Sound LoadSound(char *fileName);                                // Load sound to memory
 RLAPI Sound LoadSoundFromWave(Wave wave);                             // Load sound to memory from wave data
 RLAPI Sound LoadSoundFromRES(const char *rresName, int resId);        // Load sound to memory from rRES file (raylib Resource)
+RLAPI void UpdateSound(Sound sound, void *data, int numSamples);      // Update sound buffer with new data
 RLAPI void UnloadSound(Sound sound);                                  // Unload sound
 RLAPI void PlaySound(Sound sound);                                    // Play a sound
 RLAPI void PauseSound(Sound sound);                                   // Pause a sound