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/*
audio/wav.h
This file is part of the Osirion project and is distributed under
the terms of the GNU General Public License version 2
*/
/*
see
http://ccrma.stanford.edu/CCRMA/Courses/422/projects/WaveFormat/
*/
#include "string.h"
#include <iostream>
#include <string>
#include "audio/wav.h"
#include "filesystem/filesystem.h"
#include "sys/sys.h"
namespace audio
{
PCM *Wav::load(std::string const & name)
{
if (!name.size())
return 0;
std::string filename("sounds/");
filename.append(name);
filename.append(".wav");
filesystem::File *wav_file = filesystem::open(filename.c_str());
if (!wav_file) {
con_warn << "Could not open " << filename << std::endl;
return 0;
}
unsigned char header[44];
memset(header, 0, sizeof(header));
if (!wav_file->read(header, 44)) {
con_warn << "Error reading " << filename << std::endl;
filesystem::close(wav_file);
return 0;
}
// header RIFF
if (strncmp((char *)header, "RIFF", 4)) {
con_warn << "Error reading " << filename << ": invalid RIFF header!" << std::endl;
filesystem::close(wav_file);
return 0;
}
// format WAVE
if (strncmp((char *)header + 8, "WAVE", 4) != 0) {
con_warn << "Error reading " << filename << ": invalid WAVE header!" << std::endl;
filesystem::close(wav_file);
return 0;
}
// file size
//size_t chunksize = header[4] + (header[5] << 8) + (header[6] << 16) + (header[7] << 24);
if (strncmp((char *)header + 12, "fmt ", 4) != 0) {
con_warn << "Error reading " << filename << ": invalid format header!" << std::endl;
filesystem::close(wav_file);
return 0;
}
size_t subchunksize1 = header[16] + (header[17] << 8) + (header[18] << 16) + (header[19] << 24);
size_t audioformat = header[20] + (header[21] << 8);
if ((subchunksize1 != 16) || (audioformat != 1)) {
con_warn << "Error reading " << filename << ": unrecognized file format!" << std::endl;
filesystem::close(wav_file);
return 0;
}
unsigned int channels = header[22] + (header[23] << 8);
if ((channels < 1) || (channels > 2)) {
con_warn << "Error reading " << filename << ": invalid number of channels!" << std::endl;
filesystem::close(wav_file);
return 0;
}
unsigned int samplerate = header[24] + ((size_t)header[25] << 8) + ((size_t)header[26] << 16) + ((size_t)header[27] << 24);
//size_t byterate = header[28] + (header[29] << 8) + (header[30] << 16) + (header[31] << 24);
//size_t blockalign = header[32] + (header[33] << 8);
size_t bitspersample = header[34] + (header[35] << 8);
if (strncmp((char *)header + 36, "LIST", 4) == 0) {
// this wav file contains meta data (author, title, ..)
// byte 40 through 43 contains the metadata length instead of the datasize
size_t metasize = header[40] + (header[41] << 8) + (header[42] << 16) + (header[43] << 24);
wav_file->skip(metasize);
// the data header follows the meta data, we overwrite the original metadata header
if (!wav_file->read(header + 36, 8)) {
con_warn << "Error reading " << filename << ": unexpected end of file!" << std::endl;
filesystem::close(wav_file);
return 0;
}
}
if (strncmp((char *)header + 36, "data", 4) != 0) {
con_warn << "Error reading " << filename << ": invalid data header!" << std::endl;
filesystem::close(wav_file);
return 0;
}
size_t datasize = header[40] + (header[41] << 8) + (header[42] << 16) + (header[43] << 24);
PCM *pcm = new PCM(samplerate, bitspersample, channels, datasize);
const size_t readblocksize = channels * (bitspersample / 8);
size_t total_bytes = 0;
while ((wav_file->read((void *)(*pcm)[total_bytes], readblocksize)) && (total_bytes < datasize)) {
total_bytes += readblocksize;
}
if (total_bytes < datasize) {
con_warn << "Error reading " << filename << ": file truncated!" << std::endl;
}
con_debug << " " << filename << " " << pcm->samplerate() << "Hz " << pcm->bitspersample() << "bit " <<
pcm->channels() << " chan " << pcm->size() << " bytes" << std::endl;
filesystem::close(wav_file);
return pcm;
}
}
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