Move the compressor/limiter declarations to their own header

4 files changed, 63 insertions, 27 deletions

diff --git a/Alc/ALc.c b/Alc/ALc.c
index cca88a8f..3de59521 100644
--- a/Alc/ALc.c
+++ b/Alc/ALc.c
@@ -37,6 +37,7 @@
 #include "alBuffer.h"
 #include "alAuxEffectSlot.h"
 #include "alError.h"
+#include "mastering.h"
 #include "bformatdec.h"
 #include "alu.h"
 
diff --git a/Alc/ALu.c b/Alc/ALu.c
index a4e9c1a4..bd1bf79a 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -34,6 +34,7 @@
 #include "alu.h"
 #include "bs2b.h"
 #include "hrtf.h"
+#include "mastering.h"
 #include "uhjfilter.h"
 #include "bformatdec.h"
 #include "static_assert.h"
diff --git a/Alc/mastering.c b/Alc/mastering.c
index 9de5fd5f..91267d83 100644
--- a/Alc/mastering.c
+++ b/Alc/mastering.c
@@ -2,37 +2,19 @@
 
 #include <math.h>
 
+#include "mastering.h"
 #include "alu.h"
 #include "almalloc.h"
 
+
+extern inline ALuint GetCompressorSampleRate(const Compressor *Comp);
+
 #define RMS_WINDOW_SIZE (1<<7)
 #define RMS_WINDOW_MASK (RMS_WINDOW_SIZE-1)
 #define RMS_VALUE_MAX  (1<<24)
 
-#define LOOKAHEAD_SIZE (1<<13)
-#define LOOKAHEAD_MASK (LOOKAHEAD_SIZE-1)
-
 static_assert(RMS_VALUE_MAX < (UINT_MAX / RMS_WINDOW_SIZE), "RMS_VALUE_MAX is too big");
 
-typedef struct Compressor {
-    ALfloat PreGain;
-    ALfloat PostGain;
-    ALboolean SummedLink;
-    ALfloat AttackMin;
-    ALfloat AttackMax;
-    ALfloat ReleaseMin;
-    ALfloat ReleaseMax;
-    ALfloat Ratio;
-    ALfloat Threshold;
-    ALfloat Knee;
-    ALuint SampleRate;
-
-    ALuint RmsSum;
-    ALuint *RmsWindow;
-    ALsizei RmsIndex;
-    ALfloat Envelope[BUFFERSIZE];
-    ALfloat EnvLast;
-} Compressor;
 
 /* Multichannel compression is linked via one of two modes:
  *
@@ -209,11 +191,6 @@ Compressor *CompressorInit(const ALfloat PreGainDb, const ALfloat PostGainDb,
     return Comp;
 }
 
-ALuint GetCompressorSampleRate(const Compressor *Comp)
-{
-    return Comp->SampleRate;
-}
-
 void ApplyCompression(Compressor *Comp, const ALsizei NumChans, const ALsizei SamplesToDo,
                       ALfloat (*restrict OutBuffer)[BUFFERSIZE])
 {
diff --git a/Alc/mastering.h b/Alc/mastering.h
new file mode 100644
index 00000000..0a7b4901
--- /dev/null
+++ b/Alc/mastering.h
@@ -0,0 +1,57 @@
+#ifndef MASTERING_H
+#define MASTERING_H
+
+#include "AL/al.h"
+
+/* For BUFFERSIZE. */
+#include "alMain.h"
+
+typedef struct Compressor {
+    ALfloat PreGain;
+    ALfloat PostGain;
+    ALboolean SummedLink;
+    ALfloat AttackMin;
+    ALfloat AttackMax;
+    ALfloat ReleaseMin;
+    ALfloat ReleaseMax;
+    ALfloat Ratio;
+    ALfloat Threshold;
+    ALfloat Knee;
+    ALuint SampleRate;
+
+    ALuint RmsSum;
+    ALuint *RmsWindow;
+    ALsizei RmsIndex;
+    ALfloat Envelope[BUFFERSIZE];
+    ALfloat EnvLast;
+} Compressor;
+
+/* The compressor requires the following information for proper
+ * initialization:
+ *
+ *   PreGainDb      - Gain applied before detection (in dB).
+ *   PostGainDb     - Gain applied after compression (in dB).
+ *   SummedLink     - Whether to use summed (true) or maxed (false) linking.
+ *   RmsSensing     - Whether to use RMS (true) or Peak (false) sensing.
+ *   AttackTimeMin  - Minimum attack time (in seconds).
+ *   AttackTimeMax  - Maximum attack time.  Automates when min != max.
+ *   ReleaseTimeMin - Minimum release time (in seconds).
+ *   ReleaseTimeMax - Maximum release time.  Automates when min != max.
+ *   Ratio          - Compression ratio (x:1).  Set to 0 for true limiter.
+ *   ThresholdDb    - Triggering threshold (in dB).
+ *   KneeDb         - Knee width (below threshold; in dB).
+ *   SampleRate     - Sample rate to process.
+ */
+Compressor *CompressorInit(const ALfloat PreGainDb, const ALfloat PostGainDb,
+    const ALboolean SummedLink, const ALboolean RmsSensing, const ALfloat AttackTimeMin,
+    const ALfloat AttackTimeMax, const ALfloat ReleaseTimeMin, const ALfloat ReleaseTimeMax,
+    const ALfloat Ratio, const ALfloat ThresholdDb, const ALfloat KneeDb,
+    const ALuint SampleRate);
+
+void ApplyCompression(struct Compressor *Comp, const ALsizei NumChans, const ALsizei SamplesToDo,
+                      ALfloat (*restrict OutBuffer)[BUFFERSIZE]);
+
+inline ALuint GetCompressorSampleRate(const Compressor *Comp)
+{ return Comp->SampleRate; }
+
+#endif /* MASTERING_H */