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/*
* This file is part of AtracDEnc.
*
* AtracDEnc is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* AtracDEnc is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with AtracDEnc; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "aea.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <memory>
using std::string;
using std::array;
using std::vector;
using std::unique_ptr;
class TAeaCommon {
protected:
static constexpr uint32_t AeaMetaSize = 2048;
struct TMeta {
FILE* AeaFile;
std::array<char, AeaMetaSize> AeaHeader;
} Meta;
public:
TAeaCommon(const TMeta& meta)
: Meta(meta)
{}
uint8_t GetChannelNum() const;
string GetName() const;
virtual ~TAeaCommon();
};
uint8_t TAeaCommon::GetChannelNum() const {
return Meta.AeaHeader[264];
}
string TAeaCommon::GetName() const {
return string(&Meta.AeaHeader[4]);
}
TAeaCommon::~TAeaCommon() {
fclose(Meta.AeaFile);
}
class TAeaInput : public ICompressedInput, public TAeaCommon {
static TAeaCommon::TMeta ReadMeta(const string& filename);
public:
TAeaInput(const string& filename);
unique_ptr<TFrame> ReadFrame() override;
uint64_t GetLengthInSamples() const override;
uint8_t GetChannelNum() const override {
return TAeaCommon::GetChannelNum();
}
string GetName() const override {
return TAeaCommon::GetName();
}
};
TAeaInput::TAeaInput(const string& filename)
: TAeaCommon(ReadMeta(filename))
{}
TAeaCommon::TMeta TAeaInput::ReadMeta(const string& filename) {
FILE* fp = fopen(filename.c_str(), "rb");
if (!fp)
throw TAeaIOError("Can't open file to read", errno);
array<char, AeaMetaSize> buf;
if (fread(&buf[0], 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();
}
uint64_t TAeaInput::GetLengthInSamples() const {
#ifdef PLATFORM_WINDOWS
const int fd = _fileno(Meta.AeaFile);
#else
const int fd = fileno(Meta.AeaFile);
#endif
struct stat sb;
fstat(fd, &sb);
const uint32_t nChannels = Meta.AeaHeader[264] ? Meta.AeaHeader[264] : 1;
return (uint64_t)512 * ((sb.st_size - AeaMetaSize) / 212 / nChannels - 5);
}
unique_ptr<ICompressedIO::TFrame> TAeaInput::ReadFrame() {
unique_ptr<ICompressedIO::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;
}
class TAeaOutput : public ICompressedOutput, public TAeaCommon {
static TAeaCommon::TMeta CreateMeta(const string& filename, const string& title,
uint8_t numChannel, uint32_t numFrames);
bool FirstWrite = true;
public:
TAeaOutput(const string& filename, const string& title, uint8_t numChannel, uint32_t numFrames);
void WriteFrame(vector<char> data) override;
uint8_t GetChannelNum() const override {
return TAeaCommon::GetChannelNum();
}
string GetName() const override {
return TAeaCommon::GetName();
}
};
TAeaOutput::TAeaOutput(const string& filename, const string& title, uint8_t numChannels, uint32_t numFrames)
: TAeaCommon(CreateMeta(filename, title, numChannels, numFrames))
{}
TAeaCommon::TMeta TAeaOutput::CreateMeta(const string& filename, const string& title,
uint8_t channelsNum, uint32_t numFrames)
{
FILE* fp = fopen(filename.c_str(), "wb");
if (!fp)
throw TAeaIOError("Can't open file to write", errno);
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)channelsNum;
if (fwrite(&buf[0], AeaMetaSize, 1, fp) != 1) {
const int errnum = errno;
fclose(fp);
throw TAeaIOError("Can't write 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 write dummy frame", errnum);
}
return {fp, buf};
}
void TAeaOutput::WriteFrame(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);
}
}
TCompressedInputPtr CreateAeaInput(const std::string& filename) {
return unique_ptr<TAeaInput>(new TAeaInput(filename));
}
TCompressedOutputPtr CreateAeaOutput(const string& filename, const string& title,
uint8_t numChannels, uint32_t numFrames)
{
return unique_ptr<TAeaOutput>(new TAeaOutput(filename, title, numChannels, numFrames));
}
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