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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 "at3.h"
#include "lib/endian_tools.h"
#include <cstring>
#include <iostream>
#include <cmath>
#include <assert.h>
/*
* ATRAC3-in-WAV file format.
*
* Documented for example here:
* - ffmpeg: libavcodec/atrac3.c (atrac3_decode_init() talks about "extradata")
* - libnetmd: libnetmd/secure.c (netmd_write_wav_header() has "ATRAC extensions")
*/
namespace {
// Based on http://soundfile.sapp.org/doc/WaveFormat/ + ffmpeg/libnetmd docs
#ifdef _MSC_VER
#pragma pack(push, 1)
struct
#else
struct __attribute__((packed))
#endif
At3WaveHeader {
// "RIFF" "WAVE" header
char riff_chunk_id[4];
uint32_t chunk_size;
char riff_format[4];
// "fmt " subchunk
char subchunk1_id[4];
uint32_t subchunk1_size;
// WAVEFORMAT
uint16_t audio_format;
uint16_t num_channels;
uint32_t sample_rate;
uint32_t byte_rate;
uint16_t block_align;
uint16_t bits_per_sample;
// WAVEFORMATEX cbSize
uint16_t extradata_size; // 14
// atrac3 extradata
uint16_t unknown0; // always 1
uint32_t bytes_per_frame; // PCM bytes represented per frame = 1024 samples * 2ch * 2B = 0x1000
uint16_t coding_mode; // 1 = joint stereo, 0 = stereo
uint16_t coding_mode2; // same as <coding_mode>
uint16_t unknown1; // always 1
uint16_t unknown2; // always 0
// "fact" subchunk — required by Sony's psp_at3tool decoder and by ffmpeg
// for encoder-delay compensation. Without it, PSP tool rejects files
// > ~40 s with "input file is illegal file or over 2G Byte".
char fact_id[4];
uint32_t fact_size; // 8
uint32_t total_samples; // total PCM samples per channel
uint32_t samples_per_frame; // 1024 for ATRAC3
// "data" subchunk
char subchunk2_id[4];
uint32_t subchunk2_size;
};
#ifdef _MSC_VER
#pragma pack(pop)
#endif
class TAt3 : public ICompressedOutput {
public:
TAt3(const std::string &filename, size_t numChannels,
uint32_t numFrames, uint32_t frameSize, bool jointStereo)
: fp(fopen(filename.c_str(), "wb"))
, FrameSize(frameSize)
, FramesWritten(0)
{
if (!fp) {
throw std::runtime_error("Cannot open file to write");
}
struct At3WaveHeader header;
memset(&header, 0, sizeof(header));
uint64_t file_size = sizeof(struct At3WaveHeader) + uint64_t(numFrames) * uint64_t(frameSize);
if (file_size >= UINT32_MAX) {
throw std::runtime_error("File size is too big for this file format");
}
memcpy(header.riff_chunk_id, "RIFF", 4);
// RIFF spec: chunk_size is the size of everything after this field,
// i.e. file_size - 8 (RIFF marker + size field itself).
header.chunk_size = swapbyte32_on_be(file_size - 8);
memcpy(header.riff_format, "WAVE", 4);
memcpy(header.subchunk1_id, "fmt ", 4);
// fmt chunk ends where the next chunk ("fact") begins.
header.subchunk1_size = swapbyte32_on_be(offsetof(struct At3WaveHeader, fact_id) -
offsetof(struct At3WaveHeader, audio_format));
// libnetmd: #define NETMD_RIFF_FORMAT_TAG_ATRAC3 0x270
// mmreg.h (mingw-w64): WAVE_FORMAT_SONY_SCX 0x270
// riff.c (ffmpeg): AV_CODEC_ID_ATRAC3 0x0270
header.audio_format = swapbyte16_on_be(0x270);
header.num_channels = swapbyte16_on_be(numChannels);
header.sample_rate = swapbyte32_on_be(44100);
header.byte_rate = swapbyte32_on_be(frameSize * header.sample_rate / 1024);
header.block_align = swapbyte16_on_be(frameSize);
header.bits_per_sample = swapbyte16_on_be(0);
header.extradata_size = swapbyte16_on_be(offsetof(struct At3WaveHeader, fact_id) -
offsetof(struct At3WaveHeader, unknown0));
header.unknown0 = swapbyte16_on_be(1);
// 1024 samples × 2 channels × 2 bytes = 4096 (0x1000). Sony's encoder
// writes this value; PSP tool and ffmpeg rely on it for frame sizing.
header.bytes_per_frame = swapbyte32_on_be(0x1000);
header.coding_mode = swapbyte16_on_be(jointStereo ? 0x0001 : 0x0000);
header.coding_mode2 = header.coding_mode; // already byte-swapped (if needed)
header.unknown1 = swapbyte16_on_be(1);
header.unknown2 = swapbyte16_on_be(0);
memcpy(header.fact_id, "fact", 4);
header.fact_size = swapbyte32_on_be(8);
header.total_samples = swapbyte32_on_be(uint32_t(numFrames) * 1024);
header.samples_per_frame = swapbyte32_on_be(1024);
memcpy(header.subchunk2_id, "data", 4);
header.subchunk2_size = swapbyte32_on_be(numFrames * frameSize); // TODO
if (fwrite(&header, 1, sizeof(header), fp) != sizeof(header)) {
throw std::runtime_error("Cannot write WAV header to file");
}
}
virtual ~TAt3() override {
// The PCM engine can flush more frames than initially estimated
// (encoder look-ahead tail). Backfill the length fields so
// RIFF chunk_size, fact total_samples, and data subchunk_size
// reflect the actual frame count on disk.
if (FramesWritten > 0) {
const uint64_t actualFileSize = sizeof(struct At3WaveHeader) +
uint64_t(FramesWritten) * uint64_t(FrameSize);
if (actualFileSize < UINT32_MAX) {
const uint32_t chunkSize = uint32_t(actualFileSize - 8);
const uint32_t totalSamples = uint32_t(FramesWritten) * 1024u;
const uint32_t dataSize = uint32_t(FramesWritten) * FrameSize;
const uint32_t chunkSizeLE = swapbyte32_on_be(chunkSize);
const uint32_t totalSamplesLE = swapbyte32_on_be(totalSamples);
const uint32_t dataSizeLE = swapbyte32_on_be(dataSize);
fseek(fp, offsetof(struct At3WaveHeader, chunk_size), SEEK_SET);
fwrite(&chunkSizeLE, sizeof(uint32_t), 1, fp);
fseek(fp, offsetof(struct At3WaveHeader, total_samples), SEEK_SET);
fwrite(&totalSamplesLE, sizeof(uint32_t), 1, fp);
fseek(fp, offsetof(struct At3WaveHeader, subchunk2_size), SEEK_SET);
fwrite(&dataSizeLE, sizeof(uint32_t), 1, fp);
}
}
fclose(fp);
}
virtual void WriteFrame(std::vector<char> data) override {
if (fwrite(data.data(), 1, data.size(), fp) != data.size()) {
throw std::runtime_error("Cannot write AT3 data to file");
}
++FramesWritten;
}
std::string GetName() const override {
return {};
}
size_t GetChannelNum() const override {
return 2;
}
private:
FILE *fp;
uint32_t FrameSize;
uint64_t FramesWritten;
};
} //namespace
TCompressedOutputPtr
CreateAt3Output(const std::string& filename, size_t numChannel,
uint32_t numFrames, uint32_t framesize, bool jointStereo)
{
return std::unique_ptr<TAt3>(new TAt3(filename, numChannel, numFrames, framesize, jointStereo));
}
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