Phase 4 volume

app/streaming/audio/audio.cpp

@@ -8,6 +8,7 @@
 #include "renderers/sdl.h"
 
 #include <Limelight.h>
+#include <cmath>
 
 #define TRY_INIT_RENDERER(renderer, opusConfig)        \
 {                                                      \
@@ -183,7 +184,7 @@ void Session::arDecodeAndPlaySample(char* sampleData, int sampleLength)
     s_ActiveSession->m_AudioSampleCount++;
 
     // If audio is muted, don't decode or play the audio
-    if (s_ActiveSession->m_AudioMuted) {
+    if (s_ActiveSession->m_AudioMuted.load(std::memory_order_relaxed)) {
         return;
     }
 
@@ -217,6 +218,27 @@ void Session::arDecodeAndPlaySample(char* sampleData, int sampleLength)
         if (samplesDecoded > 0) {
             SDL_assert(desiredBufferSize >= frameSize * samplesDecoded);
             desiredBufferSize = frameSize * samplesDecoded;
+
+            const float volume = s_ActiveSession->getAudioVolumeScalar();
+            if (volume <= 0.0f) {
+                SDL_memset(buffer, 0, desiredBufferSize);
+            }
+            else if (volume < 1.0f) {
+                const int totalSamples = samplesDecoded * s_ActiveSession->m_ActiveAudioConfig.channelCount;
+                if (s_ActiveSession->m_AudioRenderer->getAudioBufferFormat() == IAudioRenderer::AudioFormat::Float32NE) {
+                    float* output = (float*)buffer;
+                    for (int i = 0; i < totalSamples; i++) {
+                        output[i] = SDL_clamp(output[i] * volume, -1.0f, 1.0f);
+                    }
+                }
+                else {
+                    short* output = (short*)buffer;
+                    for (int i = 0; i < totalSamples; i++) {
+                        const int scaled = (int) std::lround((float)output[i] * volume);
+                        output[i] = (short)SDL_clamp(scaled, -32768, 32767);
+                    }
+                }
+            }
         }
         else {
             desiredBufferSize = 0;