Clementine-audio-player-Mac.../ext/libclementine-tagreader/gmereader.cpp

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#include "gmereader.h"
#include <apefile.h>
#include <tag.h>
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#include <QByteArray>
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#include <QChar>
#include <QFile>
#include <QFileInfo>
#include <QString>
#include <QtEndian>
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#include "core/logging.h"
#include "core/timeconstants.h"
#include "tagreader.h"
bool GME::IsSupportedFormat(const QFileInfo& file_info) {
return (file_info.completeSuffix().endsWith("spc") ||
file_info.completeSuffix().endsWith("vgm"));
}
void GME::ReadFile(const QFileInfo& file_info,
cpb::tagreader::SongMetadata* song_info) {
if (file_info.completeSuffix().endsWith("spc"))
SPC::Read(file_info, song_info);
if (file_info.completeSuffix().endsWith("vgm"))
VGM::Read(file_info, song_info);
}
void GME::SPC::Read(const QFileInfo& file_info,
cpb::tagreader::SongMetadata* song_info) {
QFile file(file_info.filePath());
if (!file.open(QIODevice::ReadOnly)) return;
qLog(Debug) << "Reading tags from SPC file: " << file_info.fileName();
// Check for header -- more reliable than file name alone.
if (!file.read(33).startsWith(QString("SNES-SPC700").toLatin1())) return;
/*
* First order of business -- get any tag values that exist within the core
* file information. These only allow for a certain number of bytes
* per field, so they will likely be overwritten either by the id666 standard
* or the APETAG format (as used by other players, such as foobar and winamp)
*
* Make sure to check id6 documentation before changing the read values!
*/
file.seek(HAS_ID6_OFFSET);
bool has_id6 = (file.read(1)[0] == (char)xID6_STATUS::ON);
file.seek(SONG_TITLE_OFFSET);
song_info->set_title(QString::fromLatin1(file.read(32)).toStdString());
file.seek(GAME_TITLE_OFFSET);
song_info->set_album(QString::fromLatin1(file.read(32)).toStdString());
file.seek(ARTIST_OFFSET);
song_info->set_artist(QString::fromLatin1(file.read(32)).toStdString());
file.seek(INTRO_LENGTH_OFFSET);
QByteArray length_bytes = file.read(INTRO_LENGTH_SIZE);
quint64 length_in_sec = 0;
if (length_bytes.size() >= INTRO_LENGTH_SIZE) {
length_in_sec = ConvertSPCStringToNum(length_bytes);
qLog(Debug) << length_in_sec << "------ LENGTH";
if (!length_in_sec || length_in_sec >= 0x1FFF) {
// This means that parsing the length as a string failed, so get value LE.
length_in_sec =
length_bytes[0] | (length_bytes[1] << 8) | (length_bytes[2] << 16);
}
if (length_in_sec < 0x1FFF) {
song_info->set_length_nanosec(length_in_sec * kNsecPerSec);
}
}
file.seek(FADE_LENGTH_OFFSET);
QByteArray fade_bytes = file.read(FADE_LENGTH_SIZE);
if (fade_bytes.size() >= FADE_LENGTH_SIZE) {
quint64 fade_length_in_ms = ConvertSPCStringToNum(fade_bytes);
qLog(Debug) << fade_length_in_ms << "------ Fade Length";
if (fade_length_in_ms > 0x7FFF) {
fade_length_in_ms = fade_bytes[0] | (fade_bytes[1] << 8) |
(fade_bytes[2] << 16) | (fade_bytes[3] << 24);
}
}
/* Check for XID6 data -- this is infrequently used, but being able to fill
* in data from this is ideal before trying to rely on APETAG values. XID6
* format follows EA's binary file format standard named "IFF" */
file.seek(XID6_OFFSET);
if (has_id6 && file.read(4) == QString("xid6").toLatin1()) {
QByteArray xid6_head_data = file.read(4);
if (xid6_head_data.size() >= 4) {
qint64 xid6_size = xid6_head_data[0] | (xid6_head_data[1] << 8) |
(xid6_head_data[2] << 16) | xid6_head_data[3];
/* This should be the size remaining for entire ID6 block, but it
* seems that most files treat this as the size of the remaining header
* space... */
qLog(Debug) << file_info.fileName() << " has ID6 tag.";
while ((file.pos()) + 4 < XID6_OFFSET + xid6_size) {
QByteArray arr = file.read(4);
if (arr.size() < 4) break;
qint8 id = arr[0];
qint8 type = arr[1];
qint16 length = arr[2] | (arr[3] << 8);
file.read(GetNextMemAddressAlign32bit(length));
}
}
}
/* Music Players that support SPC tend to support additional tagging data as
* an APETAG entry at the bottom of the file instead of writing into the xid6
* tagging space. This is where a lot of the extra data for a file is stored,
* such as genre or replaygain data.
*
* This data is currently supported by TagLib, so we will simply use that for
* the remaining values. */
TagLib::APE::File ape(file_info.filePath().toStdString().data());
if (ape.hasAPETag()) {
TagLib::Tag* tag = ape.tag();
if (!tag) return;
song_info->set_year(tag->year());
song_info->set_track(tag->track());
TagReader::Decode(tag->artist(), nullptr, song_info->mutable_artist());
TagReader::Decode(tag->title(), nullptr, song_info->mutable_title());
TagReader::Decode(tag->album(), nullptr, song_info->mutable_album());
TagReader::Decode(tag->genre(), nullptr, song_info->mutable_genre());
}
song_info->set_valid(true);
song_info->set_type(cpb::tagreader::SongMetadata_Type_SPC);
}
qint16 GME::SPC::GetNextMemAddressAlign32bit(qint16 input) {
return ((input + 0x3) & ~0x3);
// Plus 0x3 for rounding up (not down), AND NOT to flatten out on a 32 bit
// level.
}
quint64 GME::SPC::ConvertSPCStringToNum(const QByteArray& arr) {
quint64 result = 0;
for (auto it = arr.begin(); it != arr.end(); it++) {
unsigned int num = *it - '0';
if (num > 9) break;
result = (result * 10) + num; // Shift Left and add.
}
return result;
}
void GME::VGM::Read(const QFileInfo& file_info,
cpb::tagreader::SongMetadata* song_info) {
QFile file(file_info.filePath());
if (!file.open(QIODevice::ReadOnly)) return;
qLog(Debug) << "Reading tags from VGM file: " << file_info.fileName();
if (!file.read(4).startsWith(QString("Vgm ").toLatin1())) return;
file.seek(GD3_TAG_PTR);
QByteArray gd3_head = file.read(4);
if (gd3_head.size() < 4) return;
quint64 pt = (unsigned char)gd3_head[0] | ((unsigned char)gd3_head[1] << 8) |
((unsigned char)gd3_head[2] << 16) |
((unsigned)gd3_head[3] << 24);
file.seek(SAMPLE_COUNT);
QByteArray sample_count_bytes = file.read(4);
file.seek(LOOP_SAMPLE_COUNT);
QByteArray loop_count_bytes = file.read(4);
quint64 length = 0;
if (!GetPlaybackLength(sample_count_bytes, loop_count_bytes, length)) return;
file.seek(GD3_TAG_PTR + pt);
QByteArray gd3_version = file.read(4);
file.seek(file.pos() + 4);
QByteArray gd3_length_bytes = file.read(4);
quint32 gd3_length =
(unsigned char)gd3_length_bytes[0] | ((unsigned char)gd3_head[1] << 8) |
((unsigned char)gd3_head[2] << 16) | ((unsigned char)gd3_head[3] << 24);
QByteArray gd3Data = file.read(gd3_length);
QTextStream fileTagStream(gd3Data, QIODevice::ReadOnly);
// Stored as 16 bit UTF string, two bytes per letter.
fileTagStream.setCodec("UTF-16");
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QStringList strings = fileTagStream.readLine(0).split(QChar('\0'));
if (strings.count() < 10) return;
/* VGM standard dictates string tag data exist in specific order.
* Order alternates between English and Japanese version of data.
* Read GD3 tag standard for more details. */
song_info->set_title(strings[0].toStdString());
song_info->set_album(strings[2].toStdString());
song_info->set_artist(strings[6].toStdString());
song_info->set_year(strings[8].left(4).toInt());
song_info->set_length_nanosec(length * kNsecPerMsec);
song_info->set_valid(true);
song_info->set_type(cpb::tagreader::SongMetadata_Type_VGM);
}
bool GME::VGM::GetPlaybackLength(const QByteArray& sample_count_bytes,
const QByteArray& loop_count_bytes,
quint64& out_length) {
if (sample_count_bytes.size() != 4) return false;
if (loop_count_bytes.size() != 4) return false;
quint64 sample_count = (unsigned char)sample_count_bytes[0] |
((unsigned char)sample_count_bytes[1] << 8) |
((unsigned char)sample_count_bytes[2] << 16) |
((unsigned char)sample_count_bytes[3] << 24);
qLog(Debug) << QString::number(sample_count, 16);
qLog(Debug) << sample_count_bytes.toHex();
if (sample_count <= 0) return false;
quint64 loop_sample_count = (unsigned char)loop_count_bytes[0] |
((unsigned char)loop_count_bytes[1] << 8) |
((unsigned char)loop_count_bytes[2] << 16) |
((unsigned char)loop_count_bytes[3] << 24);
if (loop_sample_count <= 0) {
out_length = sample_count * 1000 / SAMPLE_TIMEBASE;
return true;
}
quint64 intro_length_ms =
(sample_count - loop_sample_count) * 1000 / SAMPLE_TIMEBASE;
quint64 loop_length_ms = (loop_sample_count)*1000 / SAMPLE_TIMEBASE;
out_length = intro_length_ms + (loop_length_ms * 2) + GST_GME_LOOP_TIME_MS;
return true;
}