text: /*
   * 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/mphal.h"
  #include "py/objproperty.h"
  #include "py/runtime.h"
  #include "shared-bindings/microcontroller/Pin.h"
  #include "shared-bindings/audiobusio/PDMIn.h"
  #include "shared-bindings/util.h"
  #include "supervisor/shared/translate.h"
  
  //| .. currentmodule:: audiobusio
  //|
  //| :class:`PDMIn` -- Record an input PDM audio stream
  //| ========================================================
  //|
  //| PDMIn can be used to record an input audio signal on a given set of pins.
  //|
  //| .. class:: PDMIn(clock_pin, data_pin, *, sample_rate=16000, bit_depth=8, mono=True, oversample=64, startup_delay=0.11)
  //|
  //|   Create a PDMIn object associated with the given pins. This allows you to
  //|   record audio signals from the given pins. Individual ports may put further
  //|   restrictions on the recording parameters. The overall sample rate is
  //|   determined by `sample_rate` x ``oversample``, and the total must be 1MHz or
  //|   higher, so `sample_rate` must be a minimum of 16000.
  //|
  //|   :param ~microcontroller.Pin clock_pin: The pin to output the clock to
  //|   :param ~microcontroller.Pin data_pin: The pin to read the data from
  //|   :param int sample_rate: Target sample_rate of the resulting samples. Check `sample_rate` for actual value.
  //|     Minimum sample_rate is about 16000 Hz.
  //|   :param int bit_depth: Final number of bits per sample. Must be divisible by 8
  //|   :param bool mono: True when capturing a single channel of audio, captures two channels otherwise
  //|   :param int oversample: Number of single bit samples to decimate into a final sample. Must be divisible by 8
  //|   :param float startup_delay: seconds to wait after starting microphone clock
  //|    to allow microphone to turn on. Most require only 0.01s; some require 0.1s. Longer is safer.
  //|    Must be in range 0.0-1.0 seconds.
  //|
  
  //|   Record 8-bit unsigned samples to buffer::
  //|
  //|     import audiobusio
  //|     import board
  //|
  //|     # Prep a buffer to record into
  //|     b = bytearray(200)
  //|     with audiobusio.PDMIn(board.MICROPHONE_CLOCK, board.MICROPHONE_DATA, sample_rate=16000) as mic:
  //|         mic.record(b, len(b))
  //|
  //|   Record 16-bit unsigned samples to buffer::
  //|
  //|     import audiobusio
  //|     import board
  //|
  //|     # Prep a buffer to record into. The array interface doesn't allow for
  //|     # constructing with a set size so we append to it until we have the size
  //|     # we want.
  //|     b = array.array("H")
  //|     for i in range(200):
  //|         b.append(0)
  //|     with audiobusio.PDMIn(board.MICROPHONE_CLOCK, board.MICROPHONE_DATA, sample_rate=16000, bit_depth=16) as mic:
  //|         mic.record(b, len(b))
  //|
  STATIC mp_obj_t audiobusio_pdmin_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_clock_pin, ARG_data_pin, ARG_sample_rate, ARG_bit_depth, ARG_mono, ARG_oversample, ARG_startup_delay };
      static const mp_arg_t allowed_args[] = {
          { MP_QSTR_clock_pin,     MP_ARG_REQUIRED | MP_ARG_OBJ },
          { MP_QSTR_data_pin,      MP_ARG_REQUIRED | MP_ARG_OBJ },
          { MP_QSTR_sample_rate,   MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 16000} },
          { MP_QSTR_bit_depth,     MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 8} },
          { MP_QSTR_mono,          MP_ARG_KW_ONLY | MP_ARG_BOOL,{.u_bool = true} },
          { MP_QSTR_oversample,    MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 64} },
          { MP_QSTR_startup_delay, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
      };
      // Default microphone startup delay is 110msecs. Have seen mics that need 100 msecs plus a bit.
      static const float STARTUP_DELAY_DEFAULT = 0.110F;
  
      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_obj_t clock_pin_obj = args[ARG_clock_pin].u_obj;
      assert_pin(clock_pin_obj, false);
      const mcu_pin_obj_t *clock_pin = MP_OBJ_TO_PTR(clock_pin_obj);
      assert_pin_free(clock_pin);
  
      mp_obj_t data_pin_obj = args[ARG_data_pin].u_obj;
      assert_pin(data_pin_obj, false);
      const mcu_pin_obj_t *data_pin = MP_OBJ_TO_PTR(data_pin_obj);
      assert_pin_free(data_pin);
  
      // create PDMIn object from the given pin
      audiobusio_pdmin_obj_t *self = m_new_obj(audiobusio_pdmin_obj_t);
      self->base.type = &audiobusio_pdmin_type;
  
      uint32_t sample_rate = args[ARG_sample_rate].u_int;
      uint8_t bit_depth = args[ARG_bit_depth].u_int;
      if (bit_depth % 8 != 0) {
          mp_raise_ValueError(translate("Bit depth must be multiple of 8."));
      }
      uint8_t oversample = args[ARG_oversample].u_int;
      if (oversample % 8 != 0) {
          mp_raise_ValueError(translate("Oversample must be multiple of 8."));
      }
      bool mono = args[ARG_mono].u_bool;
  
      mp_float_t startup_delay = (args[ARG_startup_delay].u_obj == MP_OBJ_NULL)
          ? (mp_float_t)STARTUP_DELAY_DEFAULT
          : mp_obj_get_float(args[ARG_startup_delay].u_obj);
      if (startup_delay < 0.0 || startup_delay > 1.0) {
          mp_raise_ValueError(translate("Microphone startup delay must be in range 0.0 to 1.0"));
      }
  
      common_hal_audiobusio_pdmin_construct(self, clock_pin, data_pin, sample_rate,
                                            bit_depth, mono, oversample);
  
      // Wait for the microphone to start up. Some start in 10 msecs; some take as much as 100 msecs.
      mp_hal_delay_ms(startup_delay * 1000);
  
      return MP_OBJ_FROM_PTR(self);
  }
  
  //|   .. method:: deinit()
  //|
  //|      Deinitialises the PDMIn and releases any hardware resources for reuse.
  //|
  STATIC mp_obj_t audiobusio_pdmin_deinit(mp_obj_t self_in) {
      audiobusio_pdmin_obj_t *self = MP_OBJ_TO_PTR(self_in);
      common_hal_audiobusio_pdmin_deinit(self);
      return mp_const_none;
  }
  STATIC MP_DEFINE_CONST_FUN_OBJ_1(audiobusio_pdmin_deinit_obj, audiobusio_pdmin_deinit);
  
  //|   .. method:: __enter__()
  //|
  //|      No-op used by Context Managers.
  //|
  //  Provided by context manager helper.
  
  //|   .. method:: __exit__()
  //|
  //|      Automatically deinitializes the hardware when exiting a context.
  //|
  STATIC mp_obj_t audiobusio_pdmin_obj___exit__(size_t n_args, const mp_obj_t *args) {
      (void)n_args;
      common_hal_audiobusio_pdmin_deinit(args[0]);
      return mp_const_none;
  }
  STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(audiobusio_pdmin___exit___obj, 4, 4, audiobusio_pdmin_obj___exit__);
  
  
  //|   .. method:: record(destination, destination_length)
  //|
  //|     Records destination_length bytes of samples to destination. This is
  //|     blocking.
  //|
  //|     An IOError may be raised when the destination is too slow to record the
  //|     audio at the given rate. For internal flash, writing all 1s to the file
  //|     before recording is recommended to speed up writes.
  //|
  //|     :return: The number of samples recorded. If this is less than ``destination_length``,
  //|       some samples were missed due to processing time.
  //|
  STATIC mp_obj_t audiobusio_pdmin_obj_record(mp_obj_t self_obj, mp_obj_t destination, mp_obj_t destination_length) {
      audiobusio_pdmin_obj_t *self = MP_OBJ_TO_PTR(self_obj);
      raise_error_if_deinited(common_hal_audiobusio_pdmin_deinited(self));
      if (!MP_OBJ_IS_SMALL_INT(destination_length) || MP_OBJ_SMALL_INT_VALUE(destination_length) < 0) {
          mp_raise_TypeError(translate("destination_length must be an int >= 0"));
      }
      uint32_t length = MP_OBJ_SMALL_INT_VALUE(destination_length);
  
      mp_buffer_info_t bufinfo;
      if (MP_OBJ_IS_TYPE(destination, &mp_type_fileio)) {
          mp_raise_NotImplementedError(translate("Cannot record to a file"));
      } else if (mp_get_buffer(destination, &bufinfo, MP_BUFFER_WRITE)) {
          if (bufinfo.len / mp_binary_get_size('@', bufinfo.typecode, NULL) < length) {
              mp_raise_ValueError(translate("Destination capacity is smaller than destination_length."));
          }
          uint8_t bit_depth = common_hal_audiobusio_pdmin_get_bit_depth(self);
          if (bufinfo.typecode != 'H' && bit_depth == 16) {
              mp_raise_ValueError(translate("destination buffer must be an array of type 'H' for bit_depth = 16"));
          } else if (bufinfo.typecode != 'B' && bufinfo.typecode != BYTEARRAY_TYPECODE && bit_depth == 8) {
              mp_raise_ValueError(translate("destination buffer must be a bytearray or array of type 'B' for bit_depth = 8"));
          }
          // length is the buffer length in slots, not bytes.
          uint32_t length_written =
              common_hal_audiobusio_pdmin_record_to_buffer(self, bufinfo.buf, length);
          return MP_OBJ_NEW_SMALL_INT(length_written);
      }
      return mp_const_none;
  }
  MP_DEFINE_CONST_FUN_OBJ_3(audiobusio_pdmin_record_obj, audiobusio_pdmin_obj_record);
  
  //|   .. attribute:: sample_rate
  //|
  //|     The actual sample_rate of the recording. This may not match the constructed
  //|     sample rate due to internal clock limitations.
  //|
  STATIC mp_obj_t audiobusio_pdmin_obj_get_sample_rate(mp_obj_t self_in) {
      audiobusio_pdmin_obj_t *self = MP_OBJ_TO_PTR(self_in);
      raise_error_if_deinited(common_hal_audiobusio_pdmin_deinited(self));
      return MP_OBJ_NEW_SMALL_INT(common_hal_audiobusio_pdmin_get_sample_rate(self));
  }
  MP_DEFINE_CONST_FUN_OBJ_1(audiobusio_pdmin_get_sample_rate_obj, audiobusio_pdmin_obj_get_sample_rate);
  
  const mp_obj_property_t audiobusio_pdmin_sample_rate_obj = {
      .base.type = &mp_type_property,
      .proxy = {(mp_obj_t)&audiobusio_pdmin_get_sample_rate_obj,
                (mp_obj_t)&mp_const_none_obj,
                (mp_obj_t)&mp_const_none_obj},
  };
  
  STATIC const mp_rom_map_elem_t audiobusio_pdmin_locals_dict_table[] = {
      // Methods
      { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&audiobusio_pdmin_deinit_obj) },
      { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
      { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&audiobusio_pdmin___exit___obj) },
      { MP_ROM_QSTR(MP_QSTR_record), MP_ROM_PTR(&audiobusio_pdmin_record_obj) },
      { MP_ROM_QSTR(MP_QSTR_sample_rate), MP_ROM_PTR(&audiobusio_pdmin_sample_rate_obj) }
  };
  STATIC MP_DEFINE_CONST_DICT(audiobusio_pdmin_locals_dict, audiobusio_pdmin_locals_dict_table);
  
  const mp_obj_type_t audiobusio_pdmin_type = {
      { &mp_type_type },
      .name = MP_QSTR_PDMIn,
      .make_new = audiobusio_pdmin_make_new,
      .locals_dict = (mp_obj_dict_t*)&audiobusio_pdmin_locals_dict,
  };
  