First Commit

externals/openal-soft/core/bs2b.h

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+/*-
+ * Copyright (c) 2005 Boris Mikhaylov
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef CORE_BS2B_H
+#define CORE_BS2B_H
+
+#include "almalloc.h"
+
+/* Number of crossfeed levels */
+#define BS2B_CLEVELS           3
+
+/* Normal crossfeed levels */
+#define BS2B_HIGH_CLEVEL       3
+#define BS2B_MIDDLE_CLEVEL     2
+#define BS2B_LOW_CLEVEL        1
+
+/* Easy crossfeed levels */
+#define BS2B_HIGH_ECLEVEL      BS2B_HIGH_CLEVEL    + BS2B_CLEVELS
+#define BS2B_MIDDLE_ECLEVEL    BS2B_MIDDLE_CLEVEL  + BS2B_CLEVELS
+#define BS2B_LOW_ECLEVEL       BS2B_LOW_CLEVEL     + BS2B_CLEVELS
+
+/* Default crossfeed levels */
+#define BS2B_DEFAULT_CLEVEL    BS2B_HIGH_ECLEVEL
+/* Default sample rate (Hz) */
+#define BS2B_DEFAULT_SRATE     44100
+
+struct bs2b {
+    int level;  /* Crossfeed level */
+    int srate;   /* Sample rate (Hz) */
+
+    /* Lowpass IIR filter coefficients */
+    float a0_lo;
+    float b1_lo;
+
+    /* Highboost IIR filter coefficients */
+    float a0_hi;
+    float a1_hi;
+    float b1_hi;
+
+    /* Buffer of filter history
+     * [0] - first channel, [1] - second channel
+     */
+    struct t_last_sample {
+        float lo;
+        float hi;
+    } history[2];
+
+    DEF_NEWDEL(bs2b)
+};
+
+/* Clear buffers and set new coefficients with new crossfeed level and sample
+ * rate values.
+ * level - crossfeed level of *LEVEL values.
+ * srate - sample rate by Hz.
+ */
+void bs2b_set_params(bs2b *bs2b, int level, int srate);
+
+/* Return current crossfeed level value */
+int bs2b_get_level(bs2b *bs2b);
+
+/* Return current sample rate value */
+int bs2b_get_srate(bs2b *bs2b);
+
+/* Clear buffer */
+void bs2b_clear(bs2b *bs2b);
+
+void bs2b_cross_feed(bs2b *bs2b, float *Left, float *Right, size_t SamplesToDo);
+
+#endif /* CORE_BS2B_H */