From 4231c2c83f2b5331e3e38b10a308ee3752315f9c Mon Sep 17 00:00:00 2001
From: Solomon Peachy <pizza@shaftnet.org>
Date: Sat, 26 Sep 2020 17:19:07 -0400
Subject: codecs:  Add support for the 'VTX' ZX Spectrum chiptunes format.

This codec requires floating point.

Original author:  Peter Sovietov
Ported to Rockbox:  Roman Skylarov
Further integration and bugfixes:  Solomon Peachy

Change-Id: I781ecd3592dfcdbbc694063334350342534f1d6c
---
 lib/rbcodec/codecs/libayumi/ayumi.h | 72 +++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 lib/rbcodec/codecs/libayumi/ayumi.h

(limited to 'lib/rbcodec/codecs/libayumi/ayumi.h')

diff --git a/lib/rbcodec/codecs/libayumi/ayumi.h b/lib/rbcodec/codecs/libayumi/ayumi.h
new file mode 100644
index 0000000000..66d767797e
--- /dev/null
+++ b/lib/rbcodec/codecs/libayumi/ayumi.h
@@ -0,0 +1,72 @@
+/* Author: Peter Sovietov */
+
+#ifndef AYUMI_H
+#define AYUMI_H
+
+enum {
+  TONE_CHANNELS = 3,
+  DECIMATE_FACTOR = 8,
+  FIR_SIZE = 192,
+  DC_FILTER_SIZE = 1024
+};
+
+struct tone_channel {
+  int tone_period;
+  int tone_counter;
+  int tone;
+  int t_off;
+  int n_off;
+  int e_on;
+  int volume;
+  double pan_left;
+  double pan_right;
+};
+
+struct interpolator {
+  double c[4];
+  double y[4];
+};
+
+struct dc_filter {
+  double sum;
+  double delay[DC_FILTER_SIZE];
+};
+
+struct ayumi {
+  struct tone_channel channels[TONE_CHANNELS];
+  int noise_period;
+  int noise_counter;
+  int noise;
+  int envelope_counter;
+  int envelope_period;
+  int envelope_shape;
+  int envelope_segment;
+  int envelope;
+  const double* dac_table;
+  double step;
+  double x;
+  struct interpolator interpolator_left;
+  struct interpolator interpolator_right;
+  double fir_left[FIR_SIZE * 2];
+  double fir_right[FIR_SIZE * 2];
+  int fir_index;
+  struct dc_filter dc_left;
+  struct dc_filter dc_right;
+  int dc_index;
+  double left;
+  double right;
+};
+
+int ayumi_configure(struct ayumi* ay, int is_ym, double clock_rate, int sr);
+void ayumi_set_pan(struct ayumi* ay, int index, double pan, int is_eqp);
+void ayumi_set_tone(struct ayumi* ay, int index, int period);
+void ayumi_set_noise(struct ayumi* ay, int period);
+void ayumi_set_mixer(struct ayumi* ay, int index, int t_off, int n_off, int e_on);
+void ayumi_set_volume(struct ayumi* ay, int index, int volume);
+void ayumi_set_envelope(struct ayumi* ay, int period);
+void ayumi_set_envelope_shape(struct ayumi* ay, int shape);
+void ayumi_process(struct ayumi* ay);
+void ayumi_seek(struct ayumi* ay);
+void ayumi_remove_dc(struct ayumi* ay);
+
+#endif
-- 
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