1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/*
* 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; // samples per channel (ffmpeg) or bytes per frame (libnetmd)
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
// "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, uint8_t numChannels,
uint32_t numFrames, uint32_t frameSize, bool jointStereo)
: fp(fopen(filename.c_str(), "wb"))
{
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);
header.chunk_size = swapbyte32_on_be(file_size);
memcpy(header.riff_format, "WAVE", 4);
memcpy(header.subchunk1_id, "fmt ", 4);
header.subchunk1_size = swapbyte32_on_be(offsetof(struct At3WaveHeader, subchunk2_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, subchunk2_id) -
offsetof(struct At3WaveHeader, unknown0));
header.unknown0 = swapbyte16_on_be(1);
header.bytes_per_frame = swapbyte32_on_be(0x0010); // XXX
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.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 {
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");
}
}
std::string GetName() const override {
return {};
}
uint8_t GetChannelNum() const override {
return 2;
}
private:
FILE *fp;
};
} //namespace
TCompressedOutputPtr
CreateAt3Output(const std::string& filename, uint8_t numChannel,
uint32_t numFrames, uint32_t framesize, bool jointStereo)
{
return std::unique_ptr<TAt3>(new TAt3(filename, numChannel, numFrames, framesize, jointStereo));
}
|
