Merge branch 'master' of https://github.com/adafruit/circuitpython into mixer_voice

8 files changed, 909 insertions, 0 deletions

diff --git a/shared-bindings/audiocore/Mixer.c b/shared-bindings/audiocore/Mixer.c
new file mode 100644
index 000000000..ee4d8548c
--- /dev/null
+++ b/shared-bindings/audiocore/Mixer.c
@@ -0,0 +1,275 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
+ *
+ * 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.
+ */
+#include "shared-bindings/audiocore/Mixer.h"
+
+#include <stdint.h>
+
+#include "lib/utils/context_manager_helpers.h"
+#include "py/binary.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/audiocore/RawSample.h"
+#include "shared-bindings/util.h"
+#include "supervisor/shared/translate.h"
+
+//| .. currentmodule:: audioio
+//|
+//| :class:`Mixer` -- Mixes one or more audio samples together
+//| ===========================================================
+//|
+//| Mixer mixes multiple samples into one sample.
+//|
+//| .. class:: Mixer(channel_count=2, buffer_size=1024)
+//|
+//|   Create a Mixer object that can mix multiple channels with the same sample rate.
+//|
+//|   :param int channel_count: The maximum number of samples to mix at once
+//|   :param int buffer_size: The total size in bytes of the buffers to mix into
+//|
+//|   Playing a wave file from flash::
+//|
+//|     import board
+//|     import audioio
+//|     import digitalio
+//|
+//|     # Required for CircuitPlayground Express
+//|     speaker_enable = digitalio.DigitalInOut(board.SPEAKER_ENABLE)
+//|     speaker_enable.switch_to_output(value=True)
+//|
+//|     music = audioio.WaveFile(open("cplay-5.1-16bit-16khz.wav", "rb"))
+//|     drum = audioio.WaveFile(open("drum.wav", "rb"))
+//|     mixer = audioio.Mixer(voice_count=2, sample_rate=16000, channel_count=1, bits_per_sample=16, samples_signed=True)
+//|     a = audioio.AudioOut(board.A0)
+//|
+//|     print("playing")
+//|     a.play(mixer)
+//|     mixer.play(music, voice=0)
+//|     while mixer.playing:
+//|       mixer.play(drum, voice=1)
+//|       time.sleep(1)
+//|     print("stopped")
+//|
+STATIC mp_obj_t audioio_mixer_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_voice_count, ARG_buffer_size, ARG_channel_count, ARG_bits_per_sample, ARG_samples_signed, ARG_sample_rate };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_voice_count, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 2} },
+        { MP_QSTR_buffer_size, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 1024} },
+        { MP_QSTR_channel_count, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 2} },
+        { MP_QSTR_bits_per_sample, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 16} },
+        { MP_QSTR_samples_signed, MP_ARG_BOOL | MP_ARG_KW_ONLY, {.u_bool = true} },
+        { MP_QSTR_sample_rate, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 8000} },
+    };
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    mp_int_t voice_count = args[ARG_voice_count].u_int;
+    if (voice_count < 1 || voice_count > 255) {
+        mp_raise_ValueError(translate("Invalid voice count"));
+    }
+
+    mp_int_t channel_count = args[ARG_channel_count].u_int;
+    if (channel_count < 1 || channel_count > 2) {
+        mp_raise_ValueError(translate("Invalid channel count"));
+    }
+    mp_int_t sample_rate = args[ARG_sample_rate].u_int;
+    if (sample_rate < 1) {
+        mp_raise_ValueError(translate("Sample rate must be positive"));
+    }
+    mp_int_t bits_per_sample = args[ARG_bits_per_sample].u_int;
+    if (bits_per_sample != 8 && bits_per_sample != 16) {
+        mp_raise_ValueError(translate("bits_per_sample must be 8 or 16"));
+    }
+    audioio_mixer_obj_t *self = m_new_obj_var(audioio_mixer_obj_t, mp_obj_t, voice_count);
+    self->base.type = &audioio_mixer_type;
+    common_hal_audioio_mixer_construct(self, voice_count, args[ARG_buffer_size].u_int, bits_per_sample, args[ARG_samples_signed].u_bool, channel_count, sample_rate);
+
+    for(int v=0; v<voice_count; v++){
+    	self->voice[v] = audioio_mixervoice_type.make_new(&audioio_mixervoice_type, 0, 0, NULL);
+    	common_hal_audioio_mixervoice_set_parent(self->voice[v], self);
+    }
+    self->voice_tuple = mp_obj_new_tuple(self->voice_count, self->voice);
+
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|   .. method:: deinit()
+//|
+//|      Deinitialises the Mixer and releases any hardware resources for reuse.
+//|
+STATIC mp_obj_t audioio_mixer_deinit(mp_obj_t self_in) {
+    audioio_mixer_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    common_hal_audioio_mixer_deinit(self);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(audioio_mixer_deinit_obj, audioio_mixer_deinit);
+
+STATIC void check_for_deinit(audioio_mixer_obj_t *self) {
+    if (common_hal_audioio_mixer_deinited(self)) {
+        raise_deinited_error();
+    }
+}
+
+//|   .. method:: __enter__()
+//|
+//|      No-op used by Context Managers.
+//|
+//  Provided by context manager helper.
+
+//|   .. method:: __exit__()
+//|
+//|      Automatically deinitializes the hardware when exiting a context. See
+//|      :ref:`lifetime-and-contextmanagers` for more info.
+//|
+STATIC mp_obj_t audioio_mixer_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    common_hal_audioio_mixer_deinit(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(audioio_mixer___exit___obj, 4, 4, audioio_mixer_obj___exit__);
+
+
+//|   .. method:: play(sample, *, voice=0, loop=False)
+//|
+//|     Plays the sample once when loop=False and continuously when loop=True.
+//|     Does not block. Use `playing` to block.
+//|
+//|     Sample must be an `audioio.WaveFile`, `audioio.Mixer` or `audioio.RawSample`.
+//|
+//|     The sample must match the Mixer's encoding settings given in the constructor.
+//|
+STATIC mp_obj_t audioio_mixer_obj_play(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_sample, ARG_voice, ARG_loop };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_sample,    MP_ARG_OBJ | MP_ARG_REQUIRED },
+        { MP_QSTR_voice,     MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 0} },
+        { MP_QSTR_loop,      MP_ARG_BOOL | MP_ARG_KW_ONLY, {.u_bool = false} },
+    };
+    audioio_mixer_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
+    check_for_deinit(self);
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    mp_obj_t sample = args[ARG_sample].u_obj;
+    common_hal_audioio_mixer_play(self, sample, args[ARG_voice].u_int, args[ARG_loop].u_bool);
+
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_KW(audioio_mixer_play_obj, 1, audioio_mixer_obj_play);
+
+//|   .. method:: stop_voice(voice=0)
+//|
+//|     Stops playback of the sample on the given voice.
+//|
+STATIC mp_obj_t audioio_mixer_obj_stop_voice(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_voice };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_voice, MP_ARG_INT, {.u_int = 0} },
+    };
+    audioio_mixer_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
+    check_for_deinit(self);
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    common_hal_audioio_mixer_stop_voice(self, args[ARG_voice].u_int);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_KW(audioio_mixer_stop_voice_obj, 1, audioio_mixer_obj_stop_voice);
+
+//|   .. attribute:: playing
+//|
+//|     True when any voice is being output. (read-only)
+//|
+STATIC mp_obj_t audioio_mixer_obj_get_playing(mp_obj_t self_in) {
+    audioio_mixer_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    return mp_obj_new_bool(common_hal_audioio_mixer_get_playing(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(audioio_mixer_get_playing_obj, audioio_mixer_obj_get_playing);
+
+const mp_obj_property_t audioio_mixer_playing_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&audioio_mixer_get_playing_obj,
+              (mp_obj_t)&mp_const_none_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+//|   .. attribute:: sample_rate
+//|
+//|     32 bit value that dictates how quickly samples are played in Hertz (cycles per second).
+//|
+STATIC mp_obj_t audioio_mixer_obj_get_sample_rate(mp_obj_t self_in) {
+    audioio_mixer_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    return MP_OBJ_NEW_SMALL_INT(common_hal_audioio_mixer_get_sample_rate(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(audioio_mixer_get_sample_rate_obj, audioio_mixer_obj_get_sample_rate);
+
+const mp_obj_property_t audioio_mixer_sample_rate_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&audioio_mixer_get_sample_rate_obj,
+              (mp_obj_t)&mp_const_none_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+//|   .. attribute:: voice
+//|
+//|     tuple of voice objects
+//|
+STATIC mp_obj_t audioio_mixer_obj_get_voice(mp_obj_t self_in) {
+    audioio_mixer_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    raise_error_if_deinited(common_hal_audioio_mixer_deinited(self));
+    return self->voice_tuple;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(audioio_mixer_get_voice_obj, audioio_mixer_obj_get_voice);
+
+const mp_obj_property_t audioio_mixer_voice_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&audioio_mixer_get_voice_obj,
+              (mp_obj_t)&mp_const_none_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+
+STATIC const mp_rom_map_elem_t audioio_mixer_locals_dict_table[] = {
+    // Methods
+    { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&audioio_mixer_deinit_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&audioio_mixer___exit___obj) },
+
+    // Properties
+    { MP_ROM_QSTR(MP_QSTR_playing), MP_ROM_PTR(&audioio_mixer_playing_obj) },
+    { MP_ROM_QSTR(MP_QSTR_sample_rate), MP_ROM_PTR(&audioio_mixer_sample_rate_obj) },
+	{ MP_ROM_QSTR(MP_QSTR_voice), MP_ROM_PTR(&audioio_mixer_voice_obj) }
+};
+STATIC MP_DEFINE_CONST_DICT(audioio_mixer_locals_dict, audioio_mixer_locals_dict_table);
+
+const mp_obj_type_t audioio_mixer_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_Mixer,
+    .make_new = audioio_mixer_make_new,
+    .locals_dict = (mp_obj_dict_t*)&audioio_mixer_locals_dict,
+};
diff --git a/shared-bindings/audiocore/Mixer.h b/shared-bindings/audiocore/Mixer.h
new file mode 100644
index 000000000..87d681ce6
--- /dev/null
+++ b/shared-bindings/audiocore/Mixer.h
@@ -0,0 +1,51 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
+ *
+ * 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_BINDINGS_AUDIOIO_MIXER_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO_MIXER_H
+
+#include "common-hal/microcontroller/Pin.h"
+#include "shared-module/audiocore/Mixer.h"
+#include "shared-bindings/audiocore/RawSample.h"
+
+extern const mp_obj_type_t audioio_mixer_type;
+extern const mp_obj_type_t audioio_mixervoice_type;
+
+void common_hal_audioio_mixer_construct(audioio_mixer_obj_t* self,
+                                        uint8_t voice_count,
+                                        uint32_t buffer_size,
+                                        uint8_t bits_per_sample,
+                                        bool samples_signed,
+                                        uint8_t channel_count,
+                                        uint32_t sample_rate);
+
+void common_hal_audioio_mixer_deinit(audioio_mixer_obj_t* self);
+bool common_hal_audioio_mixer_deinited(audioio_mixer_obj_t* self);
+
+bool common_hal_audioio_mixer_get_playing(audioio_mixer_obj_t* self);
+uint32_t common_hal_audioio_mixer_get_sample_rate(audioio_mixer_obj_t* self);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO_MIXER_H
diff --git a/shared-bindings/audiocore/RawSample.c b/shared-bindings/audiocore/RawSample.c
new file mode 100644
index 000000000..912b48bfb
--- /dev/null
+++ b/shared-bindings/audiocore/RawSample.c
@@ -0,0 +1,187 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * 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.
+ */
+
+#include <stdint.h>
+
+#include "lib/utils/context_manager_helpers.h"
+#include "py/binary.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/util.h"
+#include "shared-bindings/audiocore/RawSample.h"
+#include "supervisor/shared/translate.h"
+
+//| .. currentmodule:: audioio
+//|
+//| :class:`RawSample` -- A raw audio sample buffer
+//| ========================================================
+//|
+//| An in-memory sound sample
+//|
+//| .. class:: RawSample(buffer, *, channel_count=1, sample_rate=8000)
+//|
+//|   Create a RawSample based on the given buffer of signed values. If channel_count is more than
+//|   1 then each channel's samples should alternate. In other words, for a two channel buffer, the
+//|   first sample will be for channel 1, the second sample will be for channel two, the third for
+//|   channel 1 and so on.
+//|
+//|   :param array buffer: An `array.array` with samples
+//|   :param int channel_count: The number of channels in the buffer
+//|   :param int sample_rate: The desired playback sample rate
+//|
+//|   Simple 8ksps 440 Hz sin wave::
+//|
+//|     import audioio
+//|     import board
+//|     import array
+//|     import time
+//|     import math
+//|
+//|     # Generate one period of sine wav.
+//|     length = 8000 // 440
+//|     sine_wave = array.array("h", [0] * length)
+//|     for i in range(length):
+//|         sine_wave[i] = int(math.sin(math.pi * 2 * i / 18) * (2 ** 15))
+//|
+//|     dac = audioio.AudioOut(board.SPEAKER)
+//|     sine_wave = audioio.RawSample(sine_wave)
+//|     dac.play(sine_wave, loop=True)
+//|     time.sleep(1)
+//|     dac.stop()
+//|
+STATIC mp_obj_t audioio_rawsample_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_buffer, ARG_channel_count, ARG_sample_rate };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_buffer, MP_ARG_OBJ | MP_ARG_REQUIRED },
+        { MP_QSTR_channel_count, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 1 } },
+        { MP_QSTR_sample_rate, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 8000} },
+    };
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    audioio_rawsample_obj_t *self = m_new_obj(audioio_rawsample_obj_t);
+    self->base.type = &audioio_rawsample_type;
+    mp_buffer_info_t bufinfo;
+    if (mp_get_buffer(args[ARG_buffer].u_obj, &bufinfo, MP_BUFFER_READ)) {
+        uint8_t bytes_per_sample = 1;
+        bool signed_samples = bufinfo.typecode == 'b' || bufinfo.typecode == 'h';
+        if (bufinfo.typecode == 'h' || bufinfo.typecode == 'H') {
+            bytes_per_sample = 2;
+        } else if (bufinfo.typecode != 'b' && bufinfo.typecode != 'B' && bufinfo.typecode != BYTEARRAY_TYPECODE) {
+            mp_raise_ValueError(translate("sample_source buffer must be a bytearray or array of type 'h', 'H', 'b' or 'B'"));
+        }
+        common_hal_audioio_rawsample_construct(self, ((uint8_t*)bufinfo.buf), bufinfo.len,
+                                               bytes_per_sample, signed_samples, args[ARG_channel_count].u_int,
+                                               args[ARG_sample_rate].u_int);
+    } else {
+        mp_raise_TypeError(translate("buffer must be a bytes-like object"));
+    }
+
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|   .. method:: deinit()
+//|
+//|      Deinitialises the AudioOut and releases any hardware resources for reuse.
+//|
+STATIC mp_obj_t audioio_rawsample_deinit(mp_obj_t self_in) {
+    audioio_rawsample_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    common_hal_audioio_rawsample_deinit(self);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(audioio_rawsample_deinit_obj, audioio_rawsample_deinit);
+
+STATIC void check_for_deinit(audioio_rawsample_obj_t *self) {
+    if (common_hal_audioio_rawsample_deinited(self)) {
+        raise_deinited_error();
+    }
+}
+
+//|   .. method:: __enter__()
+//|
+//|      No-op used by Context Managers.
+//|
+//  Provided by context manager helper.
+
+//|   .. method:: __exit__()
+//|
+//|      Automatically deinitializes the hardware when exiting a context. See
+//|      :ref:`lifetime-and-contextmanagers` for more info.
+//|
+STATIC mp_obj_t audioio_rawsample_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    common_hal_audioio_rawsample_deinit(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(audioio_rawsample___exit___obj, 4, 4, audioio_rawsample_obj___exit__);
+
+//|   .. attribute:: sample_rate
+//|
+//|     32 bit value that dictates how quickly samples are played in Hertz (cycles per second).
+//|     When the sample is looped, this can change the pitch output without changing the underlying
+//|     sample. This will not change the sample rate of any active playback. Call ``play`` again to
+//|     change it.
+//|
+STATIC mp_obj_t audioio_rawsample_obj_get_sample_rate(mp_obj_t self_in) {
+    audioio_rawsample_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    return MP_OBJ_NEW_SMALL_INT(common_hal_audioio_rawsample_get_sample_rate(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(audioio_rawsample_get_sample_rate_obj, audioio_rawsample_obj_get_sample_rate);
+
+STATIC mp_obj_t audioio_rawsample_obj_set_sample_rate(mp_obj_t self_in, mp_obj_t sample_rate) {
+    audioio_rawsample_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    common_hal_audioio_rawsample_set_sample_rate(self, mp_obj_get_int(sample_rate));
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(audioio_rawsample_set_sample_rate_obj, audioio_rawsample_obj_set_sample_rate);
+
+const mp_obj_property_t audioio_rawsample_sample_rate_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&audioio_rawsample_get_sample_rate_obj,
+              (mp_obj_t)&audioio_rawsample_set_sample_rate_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+STATIC const mp_rom_map_elem_t audioio_rawsample_locals_dict_table[] = {
+    // Methods
+    { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&audioio_rawsample_deinit_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&audioio_rawsample___exit___obj) },
+
+    // Properties
+    { MP_ROM_QSTR(MP_QSTR_sample_rate), MP_ROM_PTR(&audioio_rawsample_sample_rate_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(audioio_rawsample_locals_dict, audioio_rawsample_locals_dict_table);
+
+const mp_obj_type_t audioio_rawsample_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_RawSample,
+    .make_new = audioio_rawsample_make_new,
+    .locals_dict = (mp_obj_dict_t*)&audioio_rawsample_locals_dict,
+};
diff --git a/shared-bindings/audiocore/RawSample.h b/shared-bindings/audiocore/RawSample.h
new file mode 100644
index 000000000..b02778cad
--- /dev/null
+++ b/shared-bindings/audiocore/RawSample.h
@@ -0,0 +1,44 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * 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_BINDINGS_AUDIOIO_RAWSAMPLE_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO_RAWSAMPLE_H
+
+#include "common-hal/microcontroller/Pin.h"
+#include "shared-module/audiocore/RawSample.h"
+
+extern const mp_obj_type_t audioio_rawsample_type;
+
+void common_hal_audioio_rawsample_construct(audioio_rawsample_obj_t* self,
+    uint8_t* buffer, uint32_t len, uint8_t bytes_per_sample, bool samples_signed,
+    uint8_t channel_count, uint32_t sample_rate);
+
+void common_hal_audioio_rawsample_deinit(audioio_rawsample_obj_t* self);
+bool common_hal_audioio_rawsample_deinited(audioio_rawsample_obj_t* self);
+uint32_t common_hal_audioio_rawsample_get_sample_rate(audioio_rawsample_obj_t* self);
+void common_hal_audioio_rawsample_set_sample_rate(audioio_rawsample_obj_t* self, uint32_t sample_rate);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO_RAWSAMPLE_H
diff --git a/shared-bindings/audiocore/WaveFile.c b/shared-bindings/audiocore/WaveFile.c
new file mode 100644
index 000000000..4c1993b7c
--- /dev/null
+++ b/shared-bindings/audiocore/WaveFile.c
@@ -0,0 +1,202 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
+ *
+ * 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.
+ */
+
+#include <stdint.h>
+
+#include "lib/utils/context_manager_helpers.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "shared-bindings/audiocore/WaveFile.h"
+#include "shared-bindings/util.h"
+#include "supervisor/shared/translate.h"
+
+//| .. currentmodule:: audioio
+//|
+//| :class:`WaveFile` -- Load a wave file for audio playback
+//| ========================================================
+//|
+//| A .wav file prepped for audio playback. Only mono and stereo files are supported. Samples must
+//| be 8 bit unsigned or 16 bit signed.
+//|
+//| .. class:: WaveFile(file)
+//|
+//|   Load a .wav file for playback with `audioio.AudioOut` or `audiobusio.I2SOut`.
+//|
+//|   :param typing.BinaryIO file: Already opened wave file
+//|
+//|   Playing a wave file from flash::
+//|
+//|     import board
+//|     import audioio
+//|     import digitalio
+//|
+//|     # Required for CircuitPlayground Express
+//|     speaker_enable = digitalio.DigitalInOut(board.SPEAKER_ENABLE)
+//|     speaker_enable.switch_to_output(value=True)
+//|
+//|     data = open("cplay-5.1-16bit-16khz.wav", "rb")
+//|     wav = audioio.WaveFile(data)
+//|     a = audioio.AudioOut(board.A0)
+//|
+//|     print("playing")
+//|     a.play(wav)
+//|     while a.playing:
+//|       pass
+//|     print("stopped")
+//|
+STATIC mp_obj_t audioio_wavefile_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
+    mp_arg_check_num(n_args, kw_args, 1, 1, false);
+
+    audioio_wavefile_obj_t *self = m_new_obj(audioio_wavefile_obj_t);
+    self->base.type = &audioio_wavefile_type;
+    if (MP_OBJ_IS_TYPE(args[0], &mp_type_fileio)) {
+        common_hal_audioio_wavefile_construct(self, MP_OBJ_TO_PTR(args[0]));
+    } else {
+        mp_raise_TypeError(translate("file must be a file opened in byte mode"));
+    }
+
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|   .. method:: deinit()
+//|
+//|      Deinitialises the WaveFile and releases all memory resources for reuse.
+//|
+STATIC mp_obj_t audioio_wavefile_deinit(mp_obj_t self_in) {
+    audioio_wavefile_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    common_hal_audioio_wavefile_deinit(self);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(audioio_wavefile_deinit_obj, audioio_wavefile_deinit);
+
+STATIC void check_for_deinit(audioio_wavefile_obj_t *self) {
+    if (common_hal_audioio_wavefile_deinited(self)) {
+        raise_deinited_error();
+    }
+}
+
+//|   .. method:: __enter__()
+//|
+//|      No-op used by Context Managers.
+//|
+//  Provided by context manager helper.
+
+//|   .. method:: __exit__()
+//|
+//|      Automatically deinitializes the hardware when exiting a context. See
+//|      :ref:`lifetime-and-contextmanagers` for more info.
+//|
+STATIC mp_obj_t audioio_wavefile_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    common_hal_audioio_wavefile_deinit(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(audioio_wavefile___exit___obj, 4, 4, audioio_wavefile_obj___exit__);
+
+//|   .. attribute:: sample_rate
+//|
+//|     32 bit value that dictates how quickly samples are loaded into the DAC
+//|     in Hertz (cycles per second). When the sample is looped, this can change
+//|     the pitch output without changing the underlying sample.
+//|
+STATIC mp_obj_t audioio_wavefile_obj_get_sample_rate(mp_obj_t self_in) {
+    audioio_wavefile_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    return MP_OBJ_NEW_SMALL_INT(common_hal_audioio_wavefile_get_sample_rate(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(audioio_wavefile_get_sample_rate_obj, audioio_wavefile_obj_get_sample_rate);
+
+STATIC mp_obj_t audioio_wavefile_obj_set_sample_rate(mp_obj_t self_in, mp_obj_t sample_rate) {
+    audioio_wavefile_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    common_hal_audioio_wavefile_set_sample_rate(self, mp_obj_get_int(sample_rate));
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(audioio_wavefile_set_sample_rate_obj, audioio_wavefile_obj_set_sample_rate);
+
+const mp_obj_property_t audioio_wavefile_sample_rate_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&audioio_wavefile_get_sample_rate_obj,
+              (mp_obj_t)&audioio_wavefile_set_sample_rate_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+//|   .. attribute:: bits_per_sample
+//|
+//|     Bits per sample. (read only)
+//|
+STATIC mp_obj_t audioio_wavefile_obj_get_bits_per_sample(mp_obj_t self_in) {
+    audioio_wavefile_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    return MP_OBJ_NEW_SMALL_INT(common_hal_audioio_wavefile_get_bits_per_sample(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(audioio_wavefile_get_bits_per_sample_obj, audioio_wavefile_obj_get_bits_per_sample);
+
+const mp_obj_property_t audioio_wavefile_bits_per_sample_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&audioio_wavefile_get_bits_per_sample_obj,
+              (mp_obj_t)&mp_const_none_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+//|   .. attribute:: channel_count
+//|
+//|     Number of audio channels. (read only)
+//|
+STATIC mp_obj_t audioio_wavefile_obj_get_channel_count(mp_obj_t self_in) {
+    audioio_wavefile_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    return MP_OBJ_NEW_SMALL_INT(common_hal_audioio_wavefile_get_channel_count(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(audioio_wavefile_get_channel_count_obj, audioio_wavefile_obj_get_channel_count);
+
+const mp_obj_property_t audioio_wavefile_channel_count_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&audioio_wavefile_get_channel_count_obj,
+              (mp_obj_t)&mp_const_none_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+
+STATIC const mp_rom_map_elem_t audioio_wavefile_locals_dict_table[] = {
+    // Methods
+    { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&audioio_wavefile_deinit_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&audioio_wavefile___exit___obj) },
+
+    // Properties
+    { MP_ROM_QSTR(MP_QSTR_sample_rate), MP_ROM_PTR(&audioio_wavefile_sample_rate_obj) },
+    { MP_ROM_QSTR(MP_QSTR_bits_per_sample), MP_ROM_PTR(&audioio_wavefile_bits_per_sample_obj) },
+    { MP_ROM_QSTR(MP_QSTR_channel_count), MP_ROM_PTR(&audioio_wavefile_channel_count_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(audioio_wavefile_locals_dict, audioio_wavefile_locals_dict_table);
+
+const mp_obj_type_t audioio_wavefile_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_WaveFile,
+    .make_new = audioio_wavefile_make_new,
+    .locals_dict = (mp_obj_dict_t*)&audioio_wavefile_locals_dict,
+};
diff --git a/shared-bindings/audiocore/WaveFile.h b/shared-bindings/audiocore/WaveFile.h
new file mode 100644
index 000000000..d2572318b
--- /dev/null
+++ b/shared-bindings/audiocore/WaveFile.h
@@ -0,0 +1,47 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * 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_BINDINGS_AUDIOIO_WAVEFILE_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO_WAVEFILE_H
+
+#include "py/obj.h"
+#include "extmod/vfs_fat.h"
+
+#include "shared-module/audiocore/WaveFile.h"
+
+extern const mp_obj_type_t audioio_wavefile_type;
+
+void common_hal_audioio_wavefile_construct(audioio_wavefile_obj_t* self,
+    pyb_file_obj_t* file);
+
+void common_hal_audioio_wavefile_deinit(audioio_wavefile_obj_t* self);
+bool common_hal_audioio_wavefile_deinited(audioio_wavefile_obj_t* self);
+uint32_t common_hal_audioio_wavefile_get_sample_rate(audioio_wavefile_obj_t* self);
+void common_hal_audioio_wavefile_set_sample_rate(audioio_wavefile_obj_t* self, uint32_t sample_rate);
+uint8_t common_hal_audioio_wavefile_get_bits_per_sample(audioio_wavefile_obj_t* self);
+uint8_t common_hal_audioio_wavefile_get_channel_count(audioio_wavefile_obj_t* self);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO_WAVEFILE_H
diff --git a/shared-bindings/audiocore/__init__.c b/shared-bindings/audiocore/__init__.c
new file mode 100644
index 000000000..c64759d4f
--- /dev/null
+++ b/shared-bindings/audiocore/__init__.c
@@ -0,0 +1,69 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * 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.
+ */
+
+#include <stdint.h>
+
+#include "py/obj.h"
+#include "py/runtime.h"
+
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/audiocore/__init__.h"
+#include "shared-bindings/audiocore/Mixer.h"
+#include "shared-bindings/audiocore/RawSample.h"
+#include "shared-bindings/audiocore/WaveFile.h"
+
+//| :mod:`audiocore` --- Support for audio samples and mixer
+//| ========================================================
+//|
+//| .. module:: audiocore
+//|   :synopsis: Support for audio samples and mixer
+//|   :platform: SAMD21
+//|
+//| The `audiocore` module contains core classes for audio IO
+//|
+//| Libraries
+//|
+//| .. toctree::
+//|     :maxdepth: 3
+//|
+//|     Mixer
+//|     RawSample
+//|     WaveFile
+//|
+
+STATIC const mp_rom_map_elem_t audiocore_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_audiocore) },
+    { MP_ROM_QSTR(MP_QSTR_Mixer), MP_ROM_PTR(&audioio_mixer_type) },
+    { MP_ROM_QSTR(MP_QSTR_RawSample), MP_ROM_PTR(&audioio_rawsample_type) },
+    { MP_ROM_QSTR(MP_QSTR_WaveFile), MP_ROM_PTR(&audioio_wavefile_type) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(audiocore_module_globals, audiocore_module_globals_table);
+
+const mp_obj_module_t audiocore_module = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t*)&audiocore_module_globals,
+};
diff --git a/shared-bindings/audiocore/__init__.h b/shared-bindings/audiocore/__init__.h
new file mode 100644
index 000000000..02437cd13
--- /dev/null
+++ b/shared-bindings/audiocore/__init__.h
@@ -0,0 +1,34 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * 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_BINDINGS_AUDIOCORE___INIT___H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOCORE___INIT___H
+
+#include "py/obj.h"
+
+// Nothing now.
+
+#endif  // MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOCORE___INIT___H