From cf1b3907dd4e2b3b648c9d4bef824c1166661c1b Mon Sep 17 00:00:00 2001
From: falkTX <falktx@gmail.com>
Date: Tue, 30 Oct 2012 09:19:01 +0000
Subject: [PATCH] Carla: Properly set audio peaks on continuous-rack mode

---
 c++/carla-backend/carla_engine.cpp | 30 ++++++++++++++++++++++++++++++
 doc/Carla-TODO                     |  5 +++--
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/c++/carla-backend/carla_engine.cpp b/c++/carla-backend/carla_engine.cpp
index 23dacf7..70a2a61 100644
--- a/c++/carla-backend/carla_engine.cpp
+++ b/c++/carla-backend/carla_engine.cpp
@@ -20,6 +20,11 @@
 
 CARLA_BACKEND_START_NAMESPACE
 
+double abs_d(const double& value)
+{
+    return (value < 0.0) ? -value : value;
+}
+
 // -----------------------------------------------------------------------
 
 unsigned short CarlaEngine::m_maxPluginNumber = 0;
@@ -630,6 +635,31 @@ void CarlaEngine::processRack(float* inBuf[2], float* outBuf[2], uint32_t frames
                 memcpy(rackMidiEventsOut, rackMidiEventsIn, sizeof(CarlaEngineMidiEvent)*MAX_ENGINE_MIDI_EVENTS);
             }
 
+            // set peaks
+            {
+                double inPeak1  = 0.0;
+                double inPeak2  = 0.0;
+                double outPeak1 = 0.0;
+                double outPeak2 = 0.0;
+
+                for (uint32_t k=0; k < frames; k++)
+                {
+                    if (abs_d(inBuf[0][k]) > inPeak1)
+                        inPeak1 = abs_d(inBuf[0][k]);
+                    if (abs_d(inBuf[1][k]) > inPeak2)
+                        inPeak2 = abs_d(inBuf[1][k]);
+                    if (abs_d(outBuf[0][k]) > outPeak1)
+                        outPeak1 = abs_d(outBuf[0][k]);
+                    if (abs_d(outBuf[1][k]) > outPeak2)
+                        outPeak2 = abs_d(outBuf[1][k]);
+                }
+
+                m_insPeak[i*MAX_PEAKS + 0] = inPeak1;
+                m_insPeak[i*MAX_PEAKS + 1] = inPeak2;
+                m_outsPeak[i*MAX_PEAKS + 0] = outPeak1;
+                m_outsPeak[i*MAX_PEAKS + 1] = outPeak2;
+            }
+
             processed = true;
         }
     }
diff --git a/doc/Carla-TODO b/doc/Carla-TODO
index 0e74589..19f0fca 100644
--- a/doc/Carla-TODO
+++ b/doc/Carla-TODO
@@ -11,8 +11,9 @@ GENERAL:
 ENGINE:
  - complete RtAudio+RtMidi support
  - implement Haiku Media support (based from JACK?)
- - implement latency in continuos-rack mode
- - pre-allocate audio buffers in continuous-rack mode
+ - implement latency in continuous-rack mode
+ - pre-allocate audio buffers in continuous-rack mode (RtAudio only)
+ - DSSI/LV2/VST version (needs add-new support on control side)
 
 LADSPA: