/*
 * Filename:    WavWriter.cpp
 *
 * Description:
 *
 *
 * Version:     
 * Created:     Mon Mar  9 19:31:28 2020
 * Revision:    None
 * Author:      Rachel Fae Fox (foxiepaws),fox@foxiepa.ws
 *
 */
#include "WavWriter.h"
#include <cstdarg>
namespace amalgam {
WavWriter::WavWriter(char* filename, uint srate, uint chan, uint bps) {
    file = fopen(filename, "w");
    sr = srate;
    ch = chan;
    bd = bps;
    length = 0; 
    byterate = sr * ch * (bd/8);
    blockalign = ch * (bd/8); 
    
    // initialise the first 40 bytes for the header later.
    for (int x = 0; x < 40; x++) {
	fputc(0x00,file);
    }
}
void WavWriter::writeHeader() {
    rewind(file);
    fprintf(file,"RIFF");
    writeBytes((char*) &riffsize,4);
    fprintf(file,"WAVEfmt ");
    writeBytes((char*) &fmtsize,4);
    writeBytes((char*) &type,2);
    writeBytes((char*) &ch,2);
    writeBytes((char*) &sr,4);
    writeBytes((char*) &byterate,4);
    writeBytes((char*) &blockalign,2);
    writeBytes((char*) &bd, 2);
    fprintf(file,"data");
    writeBytes((char*) &datasize, 4);
}
void WavWriter::finalise() {
    datasize = length;
    riffsize = 20 + fmtsize + datasize;
    writeHeader();
    fclose(file);
}

void WavWriter::write(...) {
    va_list args;
    va_start(args, ch);
    for (int i=0;i < ch;i++) {
	uint32_t v = va_arg(args,int);
	writeBytes((char*) &v,(bd/8));
    }
    va_end(args);
}

void WavWriter::writeBytes(char* bytes, uint count) {
    for (int i = 0; i < count ; i++) {
	length++;
	putc(bytes[i],file);
    }
}

WavWriter::~WavWriter(){}
}