text: /*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2018 Scott Shawcroft
   * Copyright (c) 2019 Jeff Epler 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_MODULE_AUDIOIO_MP3FILE_H
  #define MICROPY_INCLUDED_SHARED_MODULE_AUDIOIO_MP3FILE_H
  
  #include "supervisor/background_callback.h"
  #include "extmod/vfs_fat.h"
  #include "py/obj.h"
  
  #include "shared-module/audiocore/__init__.h"
  
  typedef struct {
      mp_obj_base_t base;
      struct _MP3DecInfo *decoder;
      background_callback_t inbuf_fill_cb;
      uint8_t *inbuf;
      uint32_t inbuf_length;
      uint32_t inbuf_offset;
      int16_t *buffers[2];
      uint32_t len;
      uint32_t frame_buffer_size;
  
      uint32_t sample_rate;
      pyb_file_obj_t *file;
  
      uint8_t buffer_index;
      uint8_t channel_count;
      bool eof;
  
      int8_t other_channel;
      int8_t other_buffer_index;
  } audiomp3_mp3file_obj_t;
  
  // These are not available from Python because it may be called in an interrupt.
  void audiomp3_mp3file_reset_buffer(audiomp3_mp3file_obj_t *self,
      bool single_channel_output,
      uint8_t channel);
  audioio_get_buffer_result_t audiomp3_mp3file_get_buffer(audiomp3_mp3file_obj_t *self,
      bool single_channel_output,
      uint8_t channel,
      uint8_t **buffer,
      uint32_t *buffer_length);                                                     // length in bytes
  void audiomp3_mp3file_get_buffer_structure(audiomp3_mp3file_obj_t *self, bool single_channel_output,
      bool *single_buffer, bool *samples_signed,
      uint32_t *max_buffer_length, uint8_t *spacing);
  
  float audiomp3_mp3file_get_rms_level(audiomp3_mp3file_obj_t *self);
  
  #endif // MICROPY_INCLUDED_SHARED_MODULE_AUDIOIO_MP3FILE_H
  