1 files changed, 65 insertions, 0 deletions
diff --git a/circuitpython/shared-module/synthio/MidiTrack.h b/circuitpython/shared-module/synthio/MidiTrack.h
new file mode 100644
index 0000000..0af174e
--- /dev/null
+++ b/circuitpython/shared-module/synthio/MidiTrack.h
@@ -0,0 +1,65 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021 Artyom Skrobov
+ *
+ * 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 MICROPY_INCLUDED_SHARED_MODULE_SYNTHIO_MIDITRACK_H
+#define MICROPY_INCLUDED_SHARED_MODULE_SYNTHIO_MIDITRACK_H
+
+#include "py/obj.h"
+
+#include "shared-module/synthio/__init__.h"
+
+typedef struct {
+    uint16_t dur;
+    uint8_t note[2];
+} synthio_midi_span_t;
+
+typedef struct {
+    mp_obj_base_t base;
+    uint32_t sample_rate;
+    uint16_t *buffer;
+    uint16_t buffer_length;
+    synthio_midi_span_t *track;
+    uint16_t next_span;
+    uint16_t total_spans;
+} synthio_miditrack_obj_t;
+
+
+// These are not available from Python because it may be called in an interrupt.
+void synthio_miditrack_reset_buffer(synthio_miditrack_obj_t *self,
+    bool single_channel_output,
+    uint8_t channel);
+
+audioio_get_buffer_result_t synthio_miditrack_get_buffer(synthio_miditrack_obj_t *self,
+    bool single_channel_output,
+    uint8_t channel,
+    uint8_t **buffer,
+    uint32_t *buffer_length); // length in bytes
+
+void synthio_miditrack_get_buffer_structure(synthio_miditrack_obj_t *self, bool single_channel_output,
+    bool *single_buffer, bool *samples_signed,
+    uint32_t *max_buffer_length, uint8_t *spacing);
+
+#endif // MICROPY_INCLUDED_SHARED_MODULE_SYNTHIO_MIDITRACK_H