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#include "aea.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
using std::string;
TAea::TMeta TAea::ReadMeta(const string& filename) {
FILE* fp = fopen(filename.c_str(), "r");
if (!fp)
throw TAeaIOError("Can't open file to read", errno);
std::array<char, AeaMetaSize> buf;
if (fread(&buf[0], TAea::AeaMetaSize, 1, fp) != 1) {
const int errnum = errno;
fclose(fp);
throw TAeaIOError("Can't read AEA header", errnum);
}
if ( buf[0] == 0x00 && buf[1] == 0x08 && buf[2] == 0x00 && buf[3] == 0x00 && buf[264] < 3 ) {
return {fp, buf};
}
throw TAeaFormatError();
}
TAea::TMeta TAea::CreateMeta(const string& filename, const string& title, int channelNum, uint32_t numFrames) {
FILE* fp = fopen(filename.c_str(), "w");
if (!fp)
throw TAeaIOError("Can't open file to write", errno);
std::array<char, AeaMetaSize> buf;
memset(&buf[0], 0, AeaMetaSize);
buf[0] = 0x00;
buf[1] = 0x08;
buf[2] = 0x00;
buf[3] = 0x00;
strncpy(&buf[4], title.c_str(), 16);
buf[19] = 0;
// buf[210] = 0x08;
*(uint32_t*)&buf[260] = numFrames;
buf[264] = (char)channelNum;
if (fwrite(&buf[0], TAea::AeaMetaSize, 1, fp) != 1) {
const int errnum = errno;
fclose(fp);
throw TAeaIOError("Can't read AEA header", errnum);
}
static char dummy[212];
if (fwrite(&dummy[0], 212, 1, fp) != 1) {
const int errnum = errno;
fclose(fp);
throw TAeaIOError("Can't read AEA header", errnum);
}
return {fp, buf};
}
TAea::TAea(const string& filename)
: Meta(ReadMeta(filename)) {
}
TAea::TAea(const string& filename, const string& title, int channelNum, uint32_t numFrames)
: Meta(CreateMeta(filename, title, channelNum, numFrames)) {
}
TAea::~TAea() {
fclose(Meta.AeaFile);
}
std::string TAea::GetName() const {
return string(&Meta.AeaHeader[4]);
}
std::unique_ptr<TAea::TFrame> TAea::ReadFrame() {
std::unique_ptr<TAea::TFrame>frame(new TFrame(212));
if(fread(frame->Get(), frame->Size(), 1, Meta.AeaFile) != 1) {
const int errnum = errno;
fclose(Meta.AeaFile);
throw TAeaIOError("Can't read AEA frame", errnum);
}
return frame;
}
/*
void TAea::WriteFrame(std::unique_ptr<TAea::TFrame>&& frame) {
if (fwrite(frame.get(), frame->size(), 1, Meta.AeaFile) != 1) {
const int errnum = errno;
fclose(Meta.AeaFile);
throw TAeaIOError("Can't write AEA frame", errnum);
}
}
*/
void TAea::WriteFrame(std::vector<char> data) {
if (FirstWrite) {
FirstWrite = false;
return;
}
data.resize(212);
if (fwrite(data.data(), data.size(), 1, Meta.AeaFile) != 1) {
const int errnum = errno;
fclose(Meta.AeaFile);
throw TAeaIOError("Can't write AEA frame", errnum);
}
}
int TAea::GetChannelNum() const {
return Meta.AeaHeader[264];
}
long long TAea::GetLengthInSamples() const {
const int fd = fileno(Meta.AeaFile);
struct stat sb;
fstat(fd, &sb);
const uint32_t nChannels = Meta.AeaHeader[264] ? Meta.AeaHeader[264] : 1;
return 512 * ((sb.st_size - TAea::AeaMetaSize) / 212 / nChannels - 5);
}
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