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#include <cstring>
#include <algorithm>
#include <stdexcept>
#include "midifmtplugin.hpp"
qmpPluginAPI *qmpMidiFmtPlugin::api = nullptr;
uint32_t CMidiStreamReader::readDWLE()
{
uint32_t ret = 0;
for (uint32_t i = 0; i < 4; ++i)
ret |= ((uint32_t)fgetc(f)) << (i << 3);
return ret;
}
bool CMidiStreamReader::RIFFHeaderReader()
{
char hdr[9];
fread(hdr, 1, 4, f);
if (strncmp(hdr, "RIFF", 4))
return false;
fseek(f, 4, SEEK_CUR);
fread(hdr, 1, 8, f);
if (strncmp(hdr, "MIDSfmt ", 8))
return false;
if (readDWLE() != 0x0C)
return false;
ret->divs = readDWLE();
readDWLE();
fmt = readDWLE();
return true;
}
bool CMidiStreamReader::midsBodyReader()
{
char buf[9];
fread(buf, 1, 4, f);
if (strncmp(buf, "data", 4))
return false;
readDWLE();//size
uint32_t cblocks = readDWLE();
uint32_t curid = 0, cts = 0;
for (uint32_t i = 0; i < cblocks; ++i)
{
readDWLE();
uint32_t blocksz = readDWLE(), cpos = ftell(f);
while (ftell(f) - cpos < blocksz)
{
cts += readDWLE();
if (!(fmt & 1))readDWLE();
uint32_t e = readDWLE();
SEvent ev;
if (e >> 24 == 1) //set tempo
{
char s[3] = {'\0'};
for (int i = 0; i < 3; ++i)
s[i] = (e >> (8 * (2 - i))) & 0xff;
ev = SEvent(curid, cts, 0xFF, 0x51, 0);
ev.str = std::string(s, 3);
}
else if (e >> 24 == 0) //midishortmsg
ev = SEvent(curid, cts, e & 0xFF, (e >> 8) & 0xFF, (e >> 16) & 0xFF);
else return false;
ret->tracks.back().appendEvent(ev);
eventdiscarded = 0;
qmpMidiFmtPlugin::api->callEventReaderCB(ev);
if (eventdiscarded)
ret->tracks.back().eventList.pop_back();
++curid;
}
}
return true;
}
CMidiFile *CMidiStreamReader::readFile(const char *fn)
{
ret = new CMidiFile;
ret->title = ret->copyright = nullptr;
ret->std = 0;
ret->valid = 1;
ret->tracks.push_back(CMidiTrack());
try
{
if (!(f = fopen(fn, "rb")))
throw std::runtime_error("File doesn't exist");
if (!RIFFHeaderReader())
throw std::runtime_error("Wrong RIFF header");
if (!midsBodyReader())
throw std::runtime_error("MIDS data error");
}
catch (std::runtime_error &e)
{
fprintf(stderr, "CMidiStreamReader E: %s is not a supported file. Cause: %s.\n", fn, e.what());
ret->valid = 0;
if (f)
fclose(f);
f = nullptr;
}
return ret;
}
void CMidiStreamReader::discardCurrentEvent()
{
eventdiscarded = 1;
}
void CMidiStreamReader::commitEventChange(SEvent d)
{
ret->tracks.back().eventList.back().time = d.time;
ret->tracks.back().eventList.back().type = d.type;
ret->tracks.back().eventList.back().p1 = d.p1;
ret->tracks.back().eventList.back().p2 = d.p2;
}
CMidiStreamReader::CMidiStreamReader()
{
ret = nullptr;
f = nullptr;
}
CMidiStreamReader::~CMidiStreamReader()
{
}
qmpMidiFmtPlugin::qmpMidiFmtPlugin(qmpPluginAPI *_api)
{
api = _api;
}
qmpMidiFmtPlugin::~qmpMidiFmtPlugin()
{
api = nullptr;
}
void qmpMidiFmtPlugin::init()
{
api->registerFileReader(mdsreader = new CMidiStreamReader, "MIDS reader");
}
void qmpMidiFmtPlugin::deinit()
{
api->unregisterFileReader("MIDS reader");
delete mdsreader;
}
const char *qmpMidiFmtPlugin::pluginGetName()
{
return "QMidiPlayer extra midi formats plugin";
}
const char *qmpMidiFmtPlugin::pluginGetVersion()
{
return PLUGIN_VERSION;
}
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