Ryan Sartin
;
Dependents: Audio_Player Wav_player_RPG_menu OMNi-Robot_no_borrar
These files are slightly edited from William Marshall's Wav_SD_Card_Read for RS EDP cookbook entry. The necessary parts for our project were extracted.
Wav_Support_File.cpp
- Committer:
- rsartin3
- Date:
- 2013-03-04
- Revision:
- 0:a50bba1964ec
File content as of revision 0:a50bba1964ec:
/* Wav File Support */
/* **************** */
#include "mbed.h"
//#include "misra_types.h"
//#include "Wav_Support_File.h"
#define DEBUG 0
/* Function Prototypes */
unsigned char wave_file_check(unsigned char *wave_array, FILE *open_file);
/* Global Variables */
struct wave_header_construction
{ char identification_block[5];
unsigned int length_of_file;
char identifier1[5];
char identifier2[5];
unsigned int position_of_data;
unsigned short format_tag;
unsigned short number_of_channels;
unsigned int samples_per_second;
unsigned int bytes_per_second;
unsigned short bytes_per_sample;
unsigned short bits_per_sample;
char marker[5];
unsigned int number_of_bits_in_sample;
} wave_file_info;
/* Wave File Checker */
unsigned char wave_file_check(unsigned char *wave_array, FILE *open_file)
{
unsigned char brk_flag = 0u;
unsigned char x = 0u;
unsigned char valid_sample = 0u;
short ch = 0;
if(DEBUG) printf("\n\rPrinting out.WAV file header...\n\r");
for (x = 0; x < 0x2bu; x++) /* Read the first 0x2b bytes of the file as this is the haeder informtation relating to sample rate etc. */
{
ch = fgetc(open_file); /* Get the first byte from the file */
if (ch == EOF) /* Check for eof */
{
if(DEBUG) printf(" File too short to be a wave file\n\r"); /* If we have less than 0x2b then file is not a wave file. */
valid_sample = 0u;
brk_flag = 1u;
}
else{
wave_array[x] = ch; /* Load data in to header file array */
}
if (brk_flag == 1u)
{
break;
}
}
if (brk_flag == 0u) /* OK we have downloaded the header into an Array. Lets check to see if its a valid file */
{
if(DEBUG) printf(" Identification block (4 ASCII bytes)= "); /* First 4 bytes are header block */
for (x = 0u; x < 4; x++)
{
//putc(wave_array[x]); /* and write them on the screen */
wave_file_info.identification_block[x] = wave_array[x];
}
wave_file_info.identification_block[4] = 0; /* add the string terminator on the end */
if(DEBUG) printf(" '%s'\n\r", wave_file_info.identification_block);
if(DEBUG) printf(" Length of file (4 bytes) = "); /* Length of file. */
for (x = 4u; x < 8u; x++)
{
if(DEBUG) printf("%d ",wave_array[x]);
}
wave_file_info.length_of_file = ( ((unsigned int) wave_array[7] << 24)
+ ((unsigned int) wave_array[6] << 16)
+ ((unsigned int) wave_array[5] << 8)
+ ((unsigned int) wave_array[4]) );
if(DEBUG) printf(" = %d bytes\n\r", wave_file_info.length_of_file);
if(DEBUG) printf(" Identifier (4 ASCII bytes) = "); /* indentifier string1 */
for (x = 8u; x < 12u; x++)
{
//putc(wave_array[x]); /* and write them on the screen */
wave_file_info.identifier1[x-8] = wave_array[x];
}
wave_file_info.identification_block[4] = 0; /* add the string terminator on the end */
if(DEBUG) printf(" '%s'\n\r", wave_file_info.identifier1);
if(DEBUG) printf(" Identifier (4 ASCII bytes) = "); /* Identifier String 2 */
for (x = 12; x < 16u; x++)
{
//putc(wave_array[x]); /* and write them on the screen */
wave_file_info.identifier2[x-12] = wave_array[x];
}
wave_file_info.identifier2[4] = 0; /* add the string terminator on the end */
if(DEBUG) printf(" '%s'\n\r", wave_file_info.identifier2);
if(DEBUG) printf(" Position of data (4 bytes) = "); /* Position of data */
for (x = 16u; x < 20u; x++)
{
if(DEBUG) printf("%d ",wave_array[x]);
}
wave_file_info.position_of_data = ( ((unsigned int) wave_array[19] << 24)
+ ((unsigned int) wave_array[18] << 16)
+ ((unsigned int) wave_array[17] << 8)
+ ((unsigned int) wave_array[16]) );
if(DEBUG) printf(" = %d\n\r", wave_file_info.position_of_data);
if(DEBUG) printf(" Format Tag - Always 1 for Wave PCM (2 bytes) = "); /* format tag */
for (x = 20u; x < 22u; x++)
{
if(DEBUG) printf("%d ",wave_array[x]);
}
wave_file_info.format_tag = ( ((unsigned int) wave_array[21] << 8)
+ ((unsigned int) wave_array[20]) );
if(DEBUG) printf(" = %d\n\r", wave_file_info.format_tag);
if(DEBUG) printf(" Number of channels (2 bytes) = "); /* Number of channels, mono or steroeo */
for (x = 22u; x < 24u; x++)
{
if(DEBUG) printf("%d ",wave_array[x]);
}
wave_file_info.number_of_channels = ( ((unsigned int) wave_array[23] << 8)
+ ((unsigned int) wave_array[22]) );
if(DEBUG) printf(" = %d channel(s)\n\r", wave_file_info.number_of_channels);
if(DEBUG) printf(" Samples per second (4 bytes) = "); /* Samples per second */
for (x = 24u; x < 28u; x++)
{
if(DEBUG) printf("%d ",wave_array[x]);
}
wave_file_info.samples_per_second =( ((unsigned int) wave_array[27] << 24)
+ ((unsigned int) wave_array[26] << 16)
+ ((unsigned int) wave_array[25] << 8)
+ ((unsigned int) wave_array[24]) );
if(DEBUG) printf(" = %d samples per sec\n\r", wave_file_info.samples_per_second);
if(DEBUG) printf(" Bytes Per Second (4 bytes) = "); /* Bytes per second */
for (x = 28u; x < 32u; x++)
{
if(DEBUG) printf("%d ",wave_array[x]);
}
wave_file_info.bytes_per_second = ( ((unsigned int) wave_array[31] << 24)
+ ((unsigned int) wave_array[30] << 16)
+ ((unsigned int) wave_array[29] << 8)
+ ((unsigned int) wave_array[28]) );
if(DEBUG) printf(" = %d bytes per sec\n\r", wave_file_info.bytes_per_second);
if(DEBUG) printf(" Bytes Per Sample (2 bytes) = "); /* Bytes per sample */
for (x = 32u; x < 34u; x++)
{
if(DEBUG) printf("%d ",wave_array[x]);
}
wave_file_info.bytes_per_sample = ( ((unsigned int) wave_array[33] << 8)
+ ((unsigned int) wave_array[32]) );
if(DEBUG) printf(" = %d bytes\n\r", wave_file_info.bytes_per_sample);
if(DEBUG) printf(" Bits Per Sample (2 bytes) = "); /* Bits per sample */
for (x = 34u; x < 36u; x++)
{
if(DEBUG) printf("%d ",wave_array[x]);
}
wave_file_info.bits_per_sample = ( ((unsigned int) wave_array[35] << 8)
+ ((unsigned int) wave_array[34]) );
if(DEBUG) printf(" = %d bits\n\r", wave_file_info.bits_per_sample);
if(DEBUG) printf(" Marker (4 ASCII bytes) = "); /* Marker */
for (x = 36u; x < 40u; x++)
{
//putc(wave_array[x]);
wave_file_info.marker[x-36] = wave_array[x];
}
wave_file_info.marker[4] = 0;
if(DEBUG) printf(" '%s'\n\r", wave_file_info.marker);
if(DEBUG) printf(" The number of bits in the sample (4 bytes) = "); /* Number of bits per sample. */
for (x = 40u; x < 44u; x++)
{
if(DEBUG) printf("%d ",wave_array[x]);
}
wave_file_info.number_of_bits_in_sample = ( ((unsigned int) wave_array[43] << 24)
+ ((unsigned int) wave_array[42] << 16)
+ ((unsigned int) wave_array[41] << 8)
+ ((unsigned int) wave_array[40]) );
if(DEBUG) printf(" = %d bits\n\r", wave_file_info.number_of_bits_in_sample);
/* Check for valid Wave file */
if (((wave_array[0] == 'R') && (wave_array[1] == 'I') && (wave_array[2] == 'F') && (wave_array[3] == 'F'))
&& ((wave_array[8] == 'W') && (wave_array[9] == 'A') && (wave_array[0x0a] == 'V') && (wave_array[0x0b] == 'E'))
&& ((wave_array[0x0c] == 'f') && (wave_array[0x0d] == 'm') && (wave_array[0x0e] == 't') && (wave_array[0x0f] == ' '))
&& (wave_array[0x14] == 0x01)) valid_sample = 1u;
}
if(DEBUG) printf("Finished examining the .WAV file header\n\r");
if (valid_sample == 1)
{
if(DEBUG) printf("Sample is a valid .WAV sample file\n\n\r");
}
else{
if(DEBUG) printf("Sample is a NOT a valid .WAV sample file\n\n\r");
}
return valid_sample;
}