wavdecode.c File Reference

WAV PCM decoder.

Copyright (c) 2009-2018 Microchip Technology Inc. and its subsidiaries.

#include "wavdecode.h"
#include <string.h>

Macros
#define	PCM_COMP_CODE   0x1
	Tag for PCM format. More...
#define	TAG_RIFF   0x52494646
#define	TAG_WAVE   0x57415645
#define	TAG_FMT   0x666D7420
#define	TAG_DATA   0x64617461

Functions
static bool	pcm_decode (struct wav_info_t *wav_info)
	Decode a buffer of OUTPUT_BUFFER_SIZE bytes from the WAV PCM file. More...
bool	wav_decode (struct wav_info_t *wav_info)
	Decode a buffer of OUTPUT_BUFFER_SIZE bytes from the WAV file. More...
bool	wav_decode_end (struct wav_info_t *wav_info)
	End the decoding, clean remaining buffers. More...
uint32_t	wav_get_duration_s (struct wav_info_t *wav_info)
	Get the duration of a WAV file in seconds. More...
bool	wav_header_decode (struct wav_info_t *wav_info)
	Decode the header of a WAV file. This function will fill the wav_info_t structure passed in argument to this function. More...
static bool	get_wav_data (struct wav_info_t *wav_info, uint8_t *data, uint8_t nbbyte)
static bool	get_wav_byte (struct wav_info_t *wav_info, uint8_t *data8)
static uint16_t	conv16little2big (uint16_t i)
static uint32_t	conv32little2big (uint32_t i)

Variables
bool(*	p_decode_fct )(struct wav_info_t *)

#define PCM_COMP_CODE   0x1

Tag for PCM format.

Referenced by wav_header_decode().

#define TAG_DATA   0x64617461

Referenced by wav_header_decode().

#define TAG_FMT   0x666D7420

Referenced by wav_header_decode().

#define TAG_RIFF   0x52494646

Tags to delimit sections in the WAV file format.

Referenced by wav_header_decode().

#define TAG_WAVE   0x57415645

Referenced by wav_header_decode().

static uint16_t conv16little2big ( uint16_t  i )

static

Referenced by wav_header_decode().

static uint32_t conv32little2big ( uint32_t  i )

static

Referenced by wav_header_decode().

static bool get_wav_byte ( struct wav_info_t *  wav_info, uint8_t *  data8  )

static

References wav_info_t::buffer_current_pos, wav_info_t::in_buffer_left, and wav_file_get_data().

Referenced by pcm_decode().

static bool get_wav_data ( struct wav_info_t *  wav_info, uint8_t *  data, uint8_t  nbbyte  )

static

Helper functions

References wav_info_t::buffer_current_pos, wav_info_t::in_buffer_left, and wav_file_get_data().

Referenced by wav_header_decode().

static bool pcm_decode ( struct wav_info_t *  wav_info )

static

Decode a buffer of OUTPUT_BUFFER_SIZE bytes from the WAV PCM file.

Parameters

wav_info

the wav_info_t structure describing the file of interest.

Returns

true on success, false otherwise.

References wav_info_t::bits_per_sample, get_wav_byte(), OUTPUT_BUFFER_SIZE, wav_info_t::pcm_samples, and wav_info_t::pcm_samples_length.

Referenced by wav_header_decode().

bool(* p_decode_fct)(struct wav_info_t *)

Referenced by wav_decode(), and wav_header_decode().