Diff: BSP/PDM2PCMAudio_class.cpp

Revision:

2:9f389fd8fb2e

Parent:

1:245f83276546

Child:

3:c5091e8deede

diff -r 245f83276546 -r 9f389fd8fb2e BSP/PDM2PCMAudio_class.cpp
--- a/BSP/PDM2PCMAudio_class.cpp	Fri Apr 21 10:31:01 2017 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,137 +0,0 @@
-/**
- ******************************************************************************
- * @file    PDM2PCMAudio_class.cpp
- * @author  AST / Software Platforms and Cloud
- * @version V1.0
- * @date    November 10th, 2016
- * @brief   Implementation file for the PDM2PCMAudio conversion library.
- ******************************************************************************
- * @attention
- *
- * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *   1. Redistributions of source code must retain the above copyright notice,
- *      this list of conditions and the following disclaimer.
- *   2. Redistributions in binary form must reproduce the above copyright notice,
- *      this list of conditions and the following disclaimer in the documentation
- *      and/or other materials provided with the distribution.
- *   3. Neither the name of STMicroelectronics nor the names of its contributors
- *      may be used to endorse or promote products derived from this software
- *      without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- ******************************************************************************
- */
-
-
-/* Includes ------------------------------------------------------------------*/
-
-#include "PDM2PCMAudio_class.h"
-
-
-/* Variables -----------------------------------------------------------------*/
-
-/* Demux filter. */
-const uint8_t PDM2PCMAudio::_demux_filter[DEMUX_FILTER_SIZE] =
-{
-    0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x02, 0x03,
-    0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x02, 0x03,
-    0x04, 0x05, 0x04, 0x05, 0x06, 0x07, 0x06, 0x07,
-    0x04, 0x05, 0x04, 0x05, 0x06, 0x07, 0x06, 0x07,
-    0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x02, 0x03,
-    0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x02, 0x03,
-    0x04, 0x05, 0x04, 0x05, 0x06, 0x07, 0x06, 0x07,
-    0x04, 0x05, 0x04, 0x05, 0x06, 0x07, 0x06, 0x07,
-    0x08, 0x09, 0x08, 0x09, 0x0a, 0x0b, 0x0a, 0x0b,
-    0x08, 0x09, 0x08, 0x09, 0x0a, 0x0b, 0x0a, 0x0b,
-    0x0c, 0x0d, 0x0c, 0x0d, 0x0e, 0x0f, 0x0e, 0x0f,
-    0x0c, 0x0d, 0x0c, 0x0d, 0x0e, 0x0f, 0x0e, 0x0f,
-    0x08, 0x09, 0x08, 0x09, 0x0a, 0x0b, 0x0a, 0x0b,
-    0x08, 0x09, 0x08, 0x09, 0x0a, 0x0b, 0x0a, 0x0b,
-    0x0c, 0x0d, 0x0c, 0x0d, 0x0e, 0x0f, 0x0e, 0x0f,
-    0x0c, 0x0d, 0x0c, 0x0d, 0x0e, 0x0f, 0x0e, 0x0f
-};
-
-
-/* Methods -------------------------------------------------------------------*/
-
-/**
-* @brief  Converting audio data from PDM to PCM.
-* @param  output_buffer     Pointer to output PCM buffer data.
-* @param  input_buffer      Pointer to input PDM buffer data.
-* @param  volume            Volume level (it must be in the range [0..64]).
-* @param  decimation_factor Decimation factor (it must be either 64 or 128).
-* @retval COMPONENT_OK in case of success, COMPONENT_ERROR otherwise.
-*/
-Status_t PDM2PCMAudio::Convert(int16_t *output_buffer, uint16_t *input_buffer, uint32_t volume, uint32_t decimation_factor)
-{
-    if (!(volume <= PDM2PCM_MAX_VOLUME))
-        error("Volume level not supported: it must be in the range [0..64].\r\n");
-
-    switch (decimation_factor)
-    {
-        case 64:
-            for (uint32_t index = 0; index < _channels; index++)        
-                PDM_Filter_64_LSB(&((uint8_t *) input_buffer)[index], (uint16_t *) &(output_buffer[index]), volume, (PDMFilter_InitStruct *) &_PDM2PCM_filter[index]);
-            break;
-
-        case 128:
-            for (uint32_t index = 0; index < _channels; index++)
-                PDM_Filter_128_LSB(&((uint8_t *) input_buffer)[index], (uint16_t *) &(output_buffer[index]), volume, (PDMFilter_InitStruct *) &_PDM2PCM_filter[index]);
-            break;
-
-        default:
-            error("Decimation factor not supported: it must be either 64 or 128.\r\n");
-    }
-
-    return COMPONENT_OK;
-}
-
-/**
- * @brief  Scrambling audio data.
- * @param  output_buffer Pointer to output PDM buffer data.
- * @param  input_buffer  Pointer to input PDM buffer data.
- * @param  size          Size of the buffers (thay has to be equally sized).
- * @retval COMPONENT_OK in case of success, COMPONENT_ERROR otherwise.
- */
-Status_t PDM2PCMAudio::Scramble(uint16_t *output_buffer, uint16_t *input_buffer, uint32_t size)
-{
-    for (uint32_t index = 0; index < size; index++)
-        output_buffer[index] = HTONS(input_buffer[index]);
-
-    return COMPONENT_OK;
-}
-
-/**s
- * @brief  Demuxing audio data.
- * @param  output_buffer Pointer to output PDM buffer data.
- * @param  input_buffer  Pointer to input PDM buffer data.
- * @param  size          Size of the buffers (thay has to be equally sized).
- * @retval COMPONENT_OK in case of success, COMPONENT_ERROR otherwise.
- */
-Status_t PDM2PCMAudio::Demux(uint16_t *output_buffer, uint16_t *input_buffer, uint32_t size)
-{
-    for (uint32_t index = 0; index < size; index++)
-    {
-        uint8_t a = ((uint8_t *) input_buffer)[index * 2];
-        uint8_t b = ((uint8_t *) input_buffer)[index * 2 + 1];
-        ((uint8_t *) (output_buffer))[index * 2] = _demux_filter[a & DEMUX_FILTER_MASK] | _demux_filter[b & DEMUX_FILTER_MASK] << 4;
-        ((uint8_t *) (output_buffer))[index * 2 + 1] = _demux_filter[(a >> 1) & DEMUX_FILTER_MASK] | _demux_filter[(b >> 1) & DEMUX_FILTER_MASK] << 4;
-    }
-
-    return COMPONENT_OK;
-}
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/