void audioPlayNote(U8 note)
{
int fifospaceR,fifospaceL;
U16 toWriteNbL=100,toWriteNbR=100;
if(audioOutLIndex>=zMax[note])
audioOutLIndex=0;
if(audioOutRIndex>=zMax[note])
audioOutRIndex=0;
if((zMax[note]-audioOutLIndex)<100)
toWriteNbL=zMax[note]-audioOutLIndex;
if((zMax[note]-audioOutRIndex)<100)
toWriteNbR=zMax[note]-audioOutRIndex;
fifospaceR = (IORD_ALT_UP_AUDIO_FIFOSPACE(audio_dev->base)& ALT_UP_AUDIO_FIFOSPACE_WSRC_MSK) >> ALT_UP_AUDIO_FIFOSPACE_WSRC_OFST;
fifospaceL = (IORD_ALT_UP_AUDIO_FIFOSPACE(audio_dev->base)& ALT_UP_AUDIO_FIFOSPACE_WSLC_MSK) >> ALT_UP_AUDIO_FIFOSPACE_WSLC_OFST;
if(fifospaceL > toWriteNbL)
{
alt_up_audio_write_fifo(audio_dev,&audioYout[note][audioOutLIndex],toWriteNbL, ALT_UP_AUDIO_LEFT);
audioOutLIndex+=toWriteNbL;
}
if(fifospaceR > toWriteNbR)
{
alt_up_audio_write_fifo(audio_dev,&audioYout[note][audioOutRIndex],toWriteNbR, ALT_UP_AUDIO_RIGHT);
audioOutRIndex+=toWriteNbR;
}
}
int main()
{
int main(void)
{
alt_up_audio_dev * audio_dev;
/* used for audio record/playback */
unsigned int l_buf;
unsigned int r_buf;
// open the Audio port
audio_dev = alt_up_audio_open_dev ("/dev/Audio");
if ( audio_dev == NULL)
alt_printf ("Error: could not open audio device \n");
else
alt_printf ("Opened audio device \n");
/* read and echo audio data */
while(1)
{
int fifospace = alt_up_audio_read_fifo_avail (audio_dev, ALT_UP_AUDIO_RIGHT);
if ( fifospace > 0 ) // check if data is available
{
// read audio buffer
alt_up_audio_read_fifo (audio_dev, &(r_buf), 1, ALT_UP_AUDIO_RIGHT);
alt_up_audio_read_fifo (audio_dev, &(l_buf), 1, ALT_UP_AUDIO_LEFT);
// write audio buffer
alt_up_audio_write_fifo (audio_dev, &(r_buf), 1, ALT_UP_AUDIO_RIGHT);
alt_up_audio_write_fifo (audio_dev, &(l_buf), 1, ALT_UP_AUDIO_LEFT);
}
}
}
/*
* Overview: This plays the boom sound when the tanks are hit
*
*/
void play_doh(alt_up_audio_dev *audio, unsigned int *buffer, short int handle)
{
int lbytes;
int rbytes;
int lindex=22;
int rindex=22;
alt_up_audio_dev* aud=audio;
int i=0;
while(i<DOH_LENGTH) //200 for cha ching
{
if (alt_up_audio_write_fifo_space(audio, ALT_UP_AUDIO_LEFT) > 22)
{
lbytes = alt_up_audio_write_fifo(aud, &buffer[lindex], 96, ALT_UP_AUDIO_LEFT);
rbytes = alt_up_audio_write_fifo(aud, &buffer[rindex], 96, ALT_UP_AUDIO_RIGHT);
lindex += lbytes;
rindex += rbytes;
i++;
}
}
//printf("all good things come to an end\n");
alt_up_sd_card_fclose(handle);
}
void lose_isr(void* context, alt_u32 id)
{
// FIFO is 75% empty, need to fill it up
int sample_counter;
for (sample_counter = 0; sample_counter < SAMPLE_SIZE; sample_counter++)
{
// take 2 bytes at a time
byte_data[0] = lose_data[sound_data_counter];
byte_data[1] = lose_data[sound_data_counter+1];
sound_data_counter += 2;
// combine the two bytes and store into sample buffer
sound_buff[sample_counter] = (byte_data[1] << 8) | byte_data[0];
// if we finish reading our data buffer, then we loop back to start over
if (sound_data_counter >= LOSE_SIZE)
{
sound_data_counter = 0;
alt_up_audio_disable_write_interrupt(audio_dev);
}
}
// finally, we write this sample data to the FIFO
alt_up_audio_write_fifo(audio_dev, sound_buff, SAMPLE_SIZE, ALT_UP_AUDIO_LEFT);
alt_up_audio_write_fifo(audio_dev, sound_buff, SAMPLE_SIZE, ALT_UP_AUDIO_RIGHT);
}
void audio_ISR() {
alt_up_audio_write_fifo(audio, &audio_stream[stream_position], BUFFER_SIZE, ALT_UP_AUDIO_LEFT);
alt_up_audio_write_fifo(audio, &audio_stream[stream_position], BUFFER_SIZE, ALT_UP_AUDIO_RIGHT);
stream_position += BUFFER_SIZE;
if (stream_position >= song_size - BUFFER_SIZE) {
stream_position = 0;
}
}
// Requires:
// Effects: Plays an audio .wav file, blocking the CPU until the song has completed.
int playBlockingMusic(char* audioFile)
{
int i = 0;
int currentSample = 0;
unsigned int *sample;
file_handle fileHandle = open_file(audioFile, false);
if (fileHandle < 0) {
printf("Reading file failed \n");
return AUDIO_ERROR;
}
int fileLength = findWavSize(fileHandle);
// Allocate a buffer that is the same byte size as the file
unsigned int *buf = (unsigned int*) malloc(fileLength * 2);
int bufSize = fileLength/2;
for (i = 0; i < bufSize; i++)
{
// Extract data and store in the buf.
unsigned char firstByte = read_file(fileHandle);
unsigned char secondByte = read_file(fileHandle);
unsigned short val = (secondByte << 8) | firstByte;
buf[i] = val;
}
// Close the file on the sd card.
alt_up_sd_card_fclose(fileHandle);
while (currentSample < bufSize)
{
unsigned int space = alt_up_audio_write_fifo_space(audio, ALT_UP_AUDIO_RIGHT);
if (space > bufSize - currentSample)
{
// Don't need to fully fill the rest of the buffer.
space = bufSize - currentSample;
}
if (space > 0)
{
sample = &(buf[currentSample]);
alt_up_audio_write_fifo(audio, sample, space, ALT_UP_AUDIO_LEFT);
alt_up_audio_write_fifo(audio, sample, space, ALT_UP_AUDIO_RIGHT);
currentSample += space;
}
}
free(buf);
return 0;
}
void swapInSound(int* buf, int len)
{
if (bufSizeSwap == 0)
{
musicSwapBuffer = interruptMusicBuffer;
bufSizeSwap = interruptBufSize;
swapSample = interruptSample;
swapLoop = musicLoop;
swapDone = musicDone;
interruptMusicBuffer = buf;
interruptBufSize = len;
interruptSample = 0;
musicLoop = 0;
musicDone = 0;
unsigned int space = alt_up_audio_write_fifo_space(audio, ALT_UP_AUDIO_RIGHT);
unsigned int* sample;
if (space > interruptBufSize - interruptSample)
{
// Don't need to fully fill the rest of the buffer.
space = interruptBufSize - interruptSample;
}
if (space > 0)
{
sample = &(interruptMusicBuffer[interruptSample]);
alt_up_audio_write_fifo(audio, sample, space, ALT_UP_AUDIO_LEFT);
alt_up_audio_write_fifo(audio, sample, space, ALT_UP_AUDIO_RIGHT);
interruptSample += space;
}
if (interruptSample >= interruptBufSize)
{
if (musicLoop)
{
interruptSample = 0;
alt_up_audio_enable_write_interrupt(audio);
}
}
else
{
printf("Enabling interrupt.");
// Enable the write interrupt
alt_up_audio_enable_write_interrupt(audio);
}
}
}
/* Checks if the write FIFO for the left channel has at least BUF_THRESHOLD space available.
* If it doesn't, then just returns 0. If it does, then data from buf is written into the
* FIFO, up to a maximum of len words.
*/
unsigned int alt_up_audio_play_l(alt_up_audio_dev *audio, unsigned int *buf, int len)
{
unsigned int space = alt_up_audio_write_fifo_space (audio, ALT_UP_AUDIO_LEFT);
if (space <= BUF_THRESHOLD)
return 0;
else
return (alt_up_audio_write_fifo(audio, buf, len, ALT_UP_AUDIO_LEFT));
}
/***************************************************************************************
* Audio - Interrupt Service Routine
*
* This interrupt service routine records or plays back audio, depending on which type
* interrupt (read or write) is pending in the audio device.
****************************************************************************************/
void audio_ISR(alt_up_audio_dev* audio_dev, unsigned int id)
{
if (alt_up_audio_write_interrupt_pending(audio_dev)) // check for write interrupt
{
//int numToWrite = 0;
//int spaceAvailable = alt_up_audio_write_fifo_space(audio_dev, ALT_UP_AUDIO_LEFT);
int temp = 0, temp1 = 0;
if(soundMixer->indexSize <= 0) return;
temp = alt_up_audio_write_fifo(audio_dev, soundMixer->buffer[soundMixer->currIndex], 96, ALT_UP_AUDIO_LEFT);
temp1 = alt_up_audio_write_fifo(audio_dev, soundMixer->buffer[soundMixer->currIndex], 96, ALT_UP_AUDIO_RIGHT);
/*s->position += 96;
if(s->position>=s->length)
s->position = 0;*/
incIndex();
}
return;
}
void play_wav (unsigned int **arr)
{
alt_up_audio_reset_audio_core(audio);
unsigned int * input;
int k = 0;
input = arr[k];
while (1) {
if (alt_up_audio_write_interrupt_pending(audio) == 1)
{
alt_up_audio_write_fifo(audio, input, 100, ALT_UP_AUDIO_LEFT);
alt_up_audio_write_fifo(audio, input, 100, ALT_UP_AUDIO_RIGHT);
k++;
input = arr[k];
}
if (k >= 4377)
break;
}
}
void audioPlaySampling(void)
{
int fifospaceL,fifospaceR;
U32 ptrIndexL=0,ptrIndexR=0;
while(ptrIndexR<AUDIO_SAMPLING_MAX_DATA||ptrIndexL<AUDIO_SAMPLING_MAX_DATA)
{
fifospaceL = (IORD_ALT_UP_AUDIO_FIFOSPACE(audio_dev->base)& ALT_UP_AUDIO_FIFOSPACE_WSLC_MSK) >> ALT_UP_AUDIO_FIFOSPACE_WSLC_OFST;
if(fifospaceL>100&&ptrIndexL<AUDIO_SAMPLING_MAX_DATA)
{
alt_up_audio_write_fifo(audio_dev,&audioSamplingLData[ptrIndexL],100, ALT_UP_AUDIO_LEFT);
ptrIndexL+=100;
}
fifospaceR = (IORD_ALT_UP_AUDIO_FIFOSPACE(audio_dev->base)& ALT_UP_AUDIO_FIFOSPACE_WSRC_MSK) >> ALT_UP_AUDIO_FIFOSPACE_WSRC_OFST;
if(fifospaceR>100&&ptrIndexR<AUDIO_SAMPLING_MAX_DATA)
{
alt_up_audio_write_fifo(audio_dev,&audioSamplingRData[ptrIndexR],100, ALT_UP_AUDIO_RIGHT);
ptrIndexR+=100;
}
}
}
int loadMusic(char* audioFile, unsigned short loop, float volumeFactor)
{
int i = 0;
unsigned int *sample;
alt_up_audio_disable_write_interrupt(audio);
printf("Opening file\n");
file_handle fileHandle = open_file(audioFile, false);
if (fileHandle < 0) {
printf("Reading file failed \n");
return AUDIO_ERROR;
}
int fileLength = findWavSize(fileHandle);
// Discard header-- we are making an assumption about
// how the data is stored to make it easier to
// add sound to the music.
for (i = 0; i < 32; i++) read_file(fileHandle);
// Allocate the main music buffer to be the size of the file.
if (interruptMusicBuffer != 0) free(interruptMusicBuffer);
musicLoop = loop;
musicDone = 0;
interruptMusicBuffer = (int*) malloc((fileLength-32) * 2);
interruptBufSize = (fileLength-32)/2;
interruptSample = 0;
if (volumeFactor <= 0) volumeFactor = 1;
for (i = 0; i < interruptBufSize; i++)
{
// Extract data and store in the buf.
char firstByte = read_file(fileHandle);
char secondByte = read_file(fileHandle);
short val = ( (unsigned char) secondByte << 8) | (unsigned char) firstByte;
val = val * volumeFactor;
interruptMusicBuffer[i] = val;
}
alt_up_sd_card_fclose(fileHandle);
unsigned int space = alt_up_audio_write_fifo_space(audio, ALT_UP_AUDIO_RIGHT);
if (space > interruptBufSize - interruptSample)
{
// Don't need to fully fill the rest of the buffer.
space = interruptBufSize - interruptSample;
}
if (space > 0)
{
sample = &(interruptMusicBuffer[interruptSample]);
alt_up_audio_write_fifo(audio, sample, space, ALT_UP_AUDIO_LEFT);
alt_up_audio_write_fifo(audio, sample, space, ALT_UP_AUDIO_RIGHT);
interruptSample += space;
}
if (interruptSample >= interruptBufSize)
{
if (musicLoop)
{
interruptSample = 0;
alt_up_audio_enable_write_interrupt(audio);
}
}
else
{
// Enable the write interrupt
alt_up_audio_enable_write_interrupt(audio);
}
return 0;
}
static void playMusicISR (void* context, alt_u32 id)
#endif
{
/* Interrupt for writing*/
unsigned int space = alt_up_audio_write_fifo_space(audio, ALT_UP_AUDIO_RIGHT);
unsigned int* sample;
int i;
if (space > interruptBufSize - interruptSample)
{
// Don't need to fully fill the rest of the buffer.
space = interruptBufSize - interruptSample;
}
if (space > 0)
{
if (addSound)
{
/* Add a sound in-- must add word by word. */
for (i = 0; i < space; i++)
{
int currentWord = interruptMusicBuffer[interruptSample++];
if (soundBufferSample < soundBufSize)
{
currentWord += soundBuffer[soundBufferSample++];
}
else
{
removeSound();
}
alt_up_audio_write_fifo(audio, ¤tWord, 1, ALT_UP_AUDIO_LEFT);
alt_up_audio_write_fifo(audio, ¤tWord, 1, ALT_UP_AUDIO_RIGHT);
}
}
else
{
sample = &(interruptMusicBuffer[interruptSample]);
alt_up_audio_write_fifo(audio, sample, space, ALT_UP_AUDIO_LEFT);
alt_up_audio_write_fifo(audio, sample, space, ALT_UP_AUDIO_RIGHT);
interruptSample += space;
}
}
if (interruptSample >= interruptBufSize)
{
if (musicLoop)
{
interruptSample = 0;
}
else
{
musicDone = 1;
alt_up_audio_disable_write_interrupt(audio);
if (bufSizeSwap != 0)
{
swapOutSound();
}
}
}
}
//Audio interrupt function, plays sound effects and/or loops audio
//REQ: audmode->id must point to correct id
void audio_isr(audisr * audmode, alt_u32 irq_id) {
int i;
unsigned int ** temp;
unsigned int * second;
if (audmode->resetmix == true) {
audmode->resetmix = false;
audio_isr_2 = 0;
}
//if (audmode->mode == 0) {
if (audmode->id != audmode->oldid) {
audio_isr_k = 0;
seek = 0;
init_copy(audmode->id, audmode->oldid);
audmode->oldid = audmode->id;
}
if (audmode->id2 != audmode->oldid2) {
audio_isr_2 = 0;
audmode->oldid2 = audmode->id2;
}
if (audio_isr_k == 0) {
copy_bgm(audmode->id);
alt_up_rs232_write_data(uart, 0x6);
alt_up_rs232_write_data(uart, (int)audiosecs[audmode->id]);
}
audio_log.bgmin = copyarr[audio_isr_k];
//Mode 0, loop music
if (audmode->mode == 0) {
for (i = 0; i < 96; i++) {
audio_log.bgmin[i] = volume_adjust(audio_log.bgmin[i], audmode->newvolume);
}
}
else if (audmode->mode == 1) {
temp = arr[audmode->id2];
second = temp[audio_isr_2];
for (i = 0; i < 96; i++) {
unsigned int tempmix = audio_log.bgmin[i];
audio_log.bgmin[i] = mix_adjust(tempmix,second[i],5);
}
audio_isr_2++;
if (audio_isr_2 > audiosize[audmode->id2]) {
audio_isr_2 = 0;
audmode->mode = 0;
}
}
if (alt_up_audio_write_interrupt_pending(audio) == 1) {
alt_up_audio_write_fifo(audio, audio_log.bgmin, 96, ALT_UP_AUDIO_LEFT);
alt_up_audio_write_fifo(audio, audio_log.bgmin, 96, ALT_UP_AUDIO_RIGHT);
if (audmode->loop == true){
audio_isr_k = (audio_isr_k + 1) % audiosize[audmode->id];
seek = (seek + 1) % 333;
if (seek == 0) {
//alt_up_rs232_write_data(uart, 0x0A);
}
if (audio_isr_k == 0) {
alt_up_rs232_write_data(uart, 0x3);
}
}
else
{
if(audio_isr_k <= audiosize[audmode->id])
{
audio_isr_k += 1;
seek = (seek + 1) % 333;
if (seek == 0) {
//alt_up_rs232_write_data(uart, 0x0A);
}
}
else
{
seek = 0;
audmode->mode = 0;
audio_isr_2 = 0;
audio_isr_k = 0;
//alt_up_rs232_write_data(uart, 0x3);
alt_up_rs232_write_data(uart, 0x4);
wait();
if (audmode->shuffle == false) {
audmode->id += 1;
if ((audmode->id >= audmode->files) && (audmode->listloop == true)) {
audmode->id = 0;
//printf("Restarting songs\n");
}
else if((audmode->id >= audmode->files) && (audmode->listloop == false)) {
printf("End of Playlist\n");
audmode->id = 0;
alt_up_audio_disable_write_interrupt(audio);
}
}
else {
/*
do {
while(rs_flag == false);
alt_up_rs232_read_data(uart, &data, &parity);
}while((int)data == 0);
*/
wait();
alt_up_rs232_read_data(uart, &data, &parity);
int nextindex = (int)data;
nextindex -= 4;
//printf("Next Index: %d\n", nextindex);
if ((nextindex < 0) || (nextindex > audmode->files)) {
nextindex = 0;
printf("Error, next Index: %d\n", nextindex);
}
audmode->id = nextindex;
}
}
}
}
//}
/*
else if (audmode->mode == 1) {
if (audmode->id != audmode->oldid) {
//TEMP
audmode->id2 = audmode->id++;
if (audmode->id2 >= audmode->files) {
audmode->id2 = 0;
}
if (audiosize[audmode->id] > audiosize[audmode->id2]) {
audmode->large = audmode->id;
}
else {
audmode->large = audmode->id2;
}
//
audio_isr_k = 0;
init_copy(audmode->large, audmode->oldid);
audmode->oldid = audmode->id;
}
if (audio_isr_k == 0) {
copy_bgm(audmode->large);
alt_up_rs232_write_data(uart, 0x6);
}
audio_log.bgmin = copyarr[audio_isr_k];
for (i = 0; i < 96; i++) {
//audio_log.bgmin[i] = mix_adjust(audio_log.bgmin[i], ,audmode->newvolume);
}
if (alt_up_audio_write_interrupt_pending(audio) == 1) {
audio_isr_k = 0;
audmode->id += 1;
alt_up_rs232_write_data(uart, 0x3);
if ((audmode->id >= audmode->files) && (audmode->listloop == true)) {
audmode->id = 0;
printf("Restarting songs\n");
}
else if((audmode->id >= audmode->files) && (audmode->listloop == false)) {
printf("End of Playlist\n");
audmode->id = 0;
alt_up_audio_disable_write_interrupt(audio);
}
}
}
*/
}
euint8 open_wav(SDfile fileinfo)
{
euint8 buff[600];
euint32 buff2[512];
euint32 right[512];
euint32 left[512];
euint8 leftovers[512];
euint8 leftoverCount=0;
euint32 count = 0;
euint32 i,zz;
euint32 tempright;
euint32 temp[5];
euint32 overflow_amount = 0;
euint32 LoopC = 0;
euint32 stuff_to_write = 0;
euint32 ints_to_send = 0;
euint32 sample_rate = 0;
euint32 bitdepth = 0;
euint32 channels = 0;
euint32 formatcode = 0;
euint32 blocksize = 0;
euint32 header_size = 0;
euint32 next_address = 0;
euint32 clust_address = 0;
euint32 FAT_address = 0;
euint32 filesize = 0;
euint32 end_offset = 0;
euint32 bytes_read = 0;
euint8 end_of_file = 0;
alt_up_audio_dev* audio_dev = alt_up_audio_open_dev(AUDIO_NAME);
alt_up_audio_reset_audio_core(audio_dev);
filesize = fileinfo.file_size;
FAT_address = (euint32)fileinfo.startL | ((euint32)fileinfo.startH)<<16;
clust_address = (FAT_address-2)*Part_Boot.sec_per_clust + clust_start;
sd_readSector(clust_address,buff); //read in wav header info
bytes_read += 512;
//address = next_sect_address(address);
header_size = get_wav_header(buff,&sample_rate,&bitdepth,&channels,&formatcode,&blocksize); //psuedo code for reading in wav details, returns wav info
if(formatcode != 1)
{
UART_write("Error: incorrect wav format type, please use PCM\n\r");
return(1);
}
if(channels != 2)
{
UART_write("Error, number of channels must be 2\n\r");
return(1);
}
if((bitdepth != 32)&&(bitdepth != 16)&&(bitdepth != 24)&&(bitdepth != 8))
{
UART_write("Error, bitdepth is incorrect\n\r");
return(1);
}
if(sample_rate != 8000)
{
UART_write("Error, sample rate is incorrect\n\r");
return(1);
}
switch(sample_rate)
{
case 8000: AUDIO_SetSampleRate(RATE_ADC8K_DAC8K_USB); break;
case 32000: AUDIO_SetSampleRate(RATE_ADC32K_DAC32K_USB); break;
case 44100: AUDIO_SetSampleRate(RATE_ADC44K_DAC44K_USB); break;
case 48000: AUDIO_SetSampleRate(RATE_ADC48K_DAC48K_USB); break;
case 96000: AUDIO_SetSampleRate(RATE_ADC96K_DAC96K_USB); break;
default: printf("Non-standard sampling rate\n"); return -1;
}
count = count + header_size;
while(end_of_file == 0) //start reading bytes from offset position, if there are bytes to be read, continue
{
//convert char buffer into 32 bit buffer
while(LoopC < Part_Boot.sec_per_clust)
{
if(bitdepth == 32)
{
for(i=0;i<128;i++)
{
*((unsigned char*)&buff2[i]+0) = buff[count+0];
*((unsigned char*)&buff2[i]+1) = buff[count+1];
*((unsigned char*)&buff2[i]+2) = buff[count+2];
*((unsigned char*)&buff2[i]+3) = buff[count+3];
count += 4;
if(count > 512)
{
ints_to_send = i+1;
break;
}
if(i==127) ints_to_send = i+1;
}
count = 0;
}
if(bitdepth == 24)
{
for(i=0;i<170;i++) // PROBLEM HERE PROBS SINCE 512/3 ISNT WHOLE NUMBER
{
*((unsigned char*)&buff2[i]+0) = 0;
*((unsigned char*)&buff2[i]+1) = buff[count+0];
*((unsigned char*)&buff2[i]+2) = buff[count+1];
*((unsigned char*)&buff2[i]+3) = buff[count+2];
count += 3;
if(count >= 512)
{
count = (count-512)+3;
ints_to_send = i+1;
break;
}
}
}
if(bitdepth == 16)
{
for(i=0;i<256;i++)
{
*((unsigned char*)&buff2[i]+0) = 0;
*((unsigned char*)&buff2[i]+1) = 0;
*((unsigned char*)&buff2[i]+2) = buff[count+0];
*((unsigned char*)&buff2[i]+3) = buff[count+1];
count += 2;
if(count > 512)
{
ints_to_send = i+1;
break;
}
if(i==255) ints_to_send = i+1;
}
count = 0;
}
if(bitdepth == 8)
{
for(i=0;i<512;i++)
{
*((unsigned char*)&buff2[i]+0) = 0;
*((unsigned char*)&buff2[i]+1) = 0;
*((unsigned char*)&buff2[i]+2) = 0;
*((unsigned char*)&buff2[i]+3) = buff[count+0];
count++;
if(count > 512)
{
ints_to_send = i+1;
break;
}
if(i==511) ints_to_send = i+1;
}
count = 0;
}
// pass to left and right channels
for(i=0;i<256;i++)
{
left[i] = buff2[i*2];
right[i] = buff2[i*2+1];
}
if(end_offset != 0)
{
stuff_to_write = end_offset/(1024/ints_to_send);
end_of_file = 1;
end_offset = 0;
}
else
{
stuff_to_write = ints_to_send/2;
}
//is there space in the fifo?
while(alt_up_audio_write_fifo_space(audio_dev,0) < stuff_to_write);
//send to audio channels
alt_up_audio_write_fifo(audio_dev,right,stuff_to_write,ALT_UP_AUDIO_RIGHT);
alt_up_audio_write_fifo(audio_dev,left,stuff_to_write,ALT_UP_AUDIO_LEFT);
clust_address++;
sd_readSector(clust_address,buff);
bytes_read += 512;
LoopC++;
if(bytes_read >= filesize)
{
end_of_file = 1;
//end_offset = 512 - (bytes_read-filesize);
}
}
LoopC = 0;
clust_address = next_sect_address(FAT_address,&next_address);
FAT_address = next_address;
if(bytes_read >= filesize)
{
end_of_file = 1;
//end_offset = 512 - (bytes_read-filesize);
}
}
return(0);
}
