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-rw-r--r--src/music/midifile.cpp220
-rw-r--r--src/music/midifile.hpp5
2 files changed, 225 insertions, 0 deletions
diff --git a/src/music/midifile.cpp b/src/music/midifile.cpp
index b10bd180e..407c7a123 100644
--- a/src/music/midifile.cpp
+++ b/src/music/midifile.cpp
@@ -18,10 +18,15 @@
#include "midi.h"
#include <algorithm>
+#include "../console_func.h"
+#include "../console_internal.h"
+
/* SMF reader based on description at: http://www.somascape.org/midi/tech/mfile.html */
+static MidiFile *_midifile_instance = NULL;
+
/**
* Owning byte buffer readable as a stream.
* RAII-compliant to make teardown in error situations easier.
@@ -414,6 +419,8 @@ bool MidiFile::ReadSMFHeader(FILE *file, SMFHeader &header)
*/
bool MidiFile::LoadFile(const char *filename)
{
+ _midifile_instance = this;
+
this->blocks.clear();
this->tempos.clear();
this->tickdiv = 0;
@@ -794,6 +801,8 @@ const byte MpsMachine::programvelocities[128] = {
*/
bool MidiFile::LoadMpsData(const byte *data, size_t length)
{
+ _midifile_instance = this;
+
MpsMachine machine(data, length, *this);
return machine.PlayInto() && FixupMidiData(*this);
}
@@ -830,7 +839,218 @@ void MidiFile::MoveFrom(MidiFile &other)
std::swap(this->tempos, other.tempos);
this->tickdiv = other.tickdiv;
+ _midifile_instance = this;
+
other.blocks.clear();
other.tempos.clear();
other.tickdiv = 0;
}
+
+static void WriteVariableLen(FILE *f, uint32 value)
+{
+ if (value < 0x7F) {
+ byte tb = value;
+ fwrite(&tb, 1, 1, f);
+ } else if (value < 0x3FFF) {
+ byte tb[2];
+ tb[1] = value & 0x7F; value >>= 7;
+ tb[0] = (value & 0x7F) | 0x80; value >>= 7;
+ fwrite(tb, 1, sizeof(tb), f);
+ } else if (value < 0x1FFFFF) {
+ byte tb[3];
+ tb[2] = value & 0x7F; value >>= 7;
+ tb[1] = (value & 0x7F) | 0x80; value >>= 7;
+ tb[0] = (value & 0x7F) | 0x80; value >>= 7;
+ fwrite(tb, 1, sizeof(tb), f);
+ } else if (value < 0x0FFFFFFF) {
+ byte tb[4];
+ tb[3] = value & 0x7F; value >>= 7;
+ tb[2] = (value & 0x7F) | 0x80; value >>= 7;
+ tb[1] = (value & 0x7F) | 0x80; value >>= 7;
+ tb[0] = (value & 0x7F) | 0x80; value >>= 7;
+ fwrite(tb, 1, sizeof(tb), f);
+ }
+}
+
+/**
+ * Write a Standard MIDI File containing the decoded music.
+ * @param filename Name of file to write to
+ * @return True if the file was written to completion
+ */
+bool MidiFile::WriteSMF(const char *filename)
+{
+ FILE *f = FioFOpenFile(filename, "wb", Subdirectory::NO_DIRECTORY);
+ if (!f) {
+ return false;
+ }
+
+ /* SMF header */
+ const byte fileheader[] = {
+ 'M', 'T', 'h', 'd', // block name
+ 0x00, 0x00, 0x00, 0x06, // BE32 block length, always 6 bytes
+ 0x00, 0x00, // writing format 0 (all in one track)
+ 0x00, 0x01, // containing 1 track (BE16)
+ (byte)(this->tickdiv >> 8), (byte)this->tickdiv, // tickdiv in BE16
+ };
+ fwrite(fileheader, sizeof(fileheader), 1, f);
+
+ /* Track header */
+ const byte trackheader[] = {
+ 'M', 'T', 'r', 'k', // block name
+ 0, 0, 0, 0, // BE32 block length, unknown at this time
+ };
+ fwrite(trackheader, sizeof(trackheader), 1, f);
+ /* Determine position to write the actual track block length at */
+ size_t tracksizepos = ftell(f) - 4;
+
+ /* Write blocks in sequence */
+ uint32 lasttime = 0;
+ size_t nexttempoindex = 0;
+ for (size_t bi = 0; bi < this->blocks.size(); bi++) {
+ DataBlock &block = this->blocks[bi];
+ TempoChange &nexttempo = this->tempos[nexttempoindex];
+
+ uint32 timediff = block.ticktime - lasttime;
+
+ /* Check if there is a tempo change before this block */
+ if (nexttempo.ticktime < block.ticktime) {
+ timediff = nexttempo.ticktime - lasttime;
+ }
+
+ /* Write delta time for block */
+ lasttime += timediff;
+ bool needtime = false;
+ WriteVariableLen(f, timediff);
+
+ /* Write tempo change if there is one */
+ if (nexttempo.ticktime <= block.ticktime) {
+ byte tempobuf[6] = { MIDIST_SMF_META, 0x51, 0x03, 0, 0, 0 };
+ tempobuf[3] = (nexttempo.tempo & 0x00FF0000) >> 16;
+ tempobuf[4] = (nexttempo.tempo & 0x0000FF00) >> 8;
+ tempobuf[5] = (nexttempo.tempo & 0x000000FF);
+ fwrite(tempobuf, sizeof(tempobuf), 1, f);
+ nexttempoindex++;
+ needtime = true;
+ }
+ /* If a tempo change occurred between two blocks, rather than
+ * at start of this one, start over with delta time for the block. */
+ if (nexttempo.ticktime < block.ticktime) {
+ /* Start loop over at same index */
+ bi--;
+ continue;
+ }
+
+ /* Write each block data command */
+ byte *dp = block.data.Begin();
+ while (dp < block.data.End()) {
+ /* Always zero delta time inside blocks */
+ if (needtime) {
+ fputc(0, f);
+ }
+ needtime = true;
+
+ /* Check message type and write appropriate number of bytes */
+ switch (*dp & 0xF0) {
+ case MIDIST_NOTEOFF:
+ case MIDIST_NOTEON:
+ case MIDIST_POLYPRESS:
+ case MIDIST_CONTROLLER:
+ case MIDIST_PITCHBEND:
+ fwrite(dp, 1, 3, f);
+ dp += 3;
+ continue;
+ case MIDIST_PROGCHG:
+ case MIDIST_CHANPRESS:
+ fwrite(dp, 1, 2, f);
+ dp += 2;
+ continue;
+ }
+
+ /* Sysex needs to measure length and write that as well */
+ if (*dp == MIDIST_SYSEX) {
+ fwrite(dp, 1, 1, f);
+ dp++;
+ byte *sysexend = dp;
+ while (*sysexend != MIDIST_ENDSYSEX) sysexend++;
+ ptrdiff_t sysexlen = sysexend - dp;
+ WriteVariableLen(f, sysexlen);
+ fwrite(dp, 1, sysexend - dp, f);
+ dp = sysexend;
+ continue;
+ }
+
+ /* Fail for any other commands */
+ fclose(f);
+ return false;
+ }
+ }
+
+ /* End of track marker */
+ static const byte track_end_marker[] = { 0x00, MIDIST_SMF_META, 0x2F, 0x00 };
+ fwrite(&track_end_marker, sizeof(track_end_marker), 1, f);
+
+ /* Fill out the RIFF block length */
+ size_t trackendpos = ftell(f);
+ fseek(f, tracksizepos, SEEK_SET);
+ uint32 tracksize = (uint32)(trackendpos - tracksizepos - 4); // blindly assume we never produce files larger than 2 GB
+ tracksize = TO_BE32(tracksize);
+ fwrite(&tracksize, 4, 1, f);
+
+ fclose(f);
+ return true;
+}
+
+
+static bool CmdDumpSMF(byte argc, char *argv[])
+{
+ if (argc == 0) {
+ IConsolePrint(CC_WARNING, "Write the current song to a Standard MIDI File. Usage: 'dumpsmf <filename>'");
+ return true;
+ }
+ if (argc != 2) {
+ IConsolePrint(CC_WARNING, "You must specify a filename to write MIDI data to.");
+ return false;
+ }
+
+ if (_midifile_instance == NULL) {
+ IConsolePrint(CC_ERROR, "There is no MIDI file loaded currently, make sure music is playing, and you're using a driver that works with raw MIDI.");
+ return false;
+ }
+
+ char fnbuf[MAX_PATH] = { 0 };
+ if (seprintf(fnbuf, lastof(fnbuf), "%s%s", FiosGetScreenshotDir(), argv[1]) >= (int)lengthof(fnbuf)) {
+ IConsolePrint(CC_ERROR, "Filename too long.");
+ return false;
+ }
+ IConsolePrintF(CC_INFO, "Dumping MIDI to: %s", fnbuf);
+
+ if (_midifile_instance->WriteSMF(fnbuf)) {
+ IConsolePrint(CC_INFO, "File written successfully.");
+ return true;
+ } else {
+ IConsolePrint(CC_ERROR, "An error occurred writing MIDI file.");
+ return false;
+ }
+}
+
+static void RegisterConsoleMidiCommands()
+{
+ static bool registered = false;
+ if (!registered) {
+ IConsoleCmdRegister("dumpsmf", CmdDumpSMF);
+ registered = true;
+ }
+}
+
+MidiFile::MidiFile()
+{
+ RegisterConsoleMidiCommands();
+}
+
+MidiFile::~MidiFile()
+{
+ if (_midifile_instance == this) {
+ _midifile_instance = NULL;
+ }
+}
+
diff --git a/src/music/midifile.hpp b/src/music/midifile.hpp
index e41435364..7c567d45c 100644
--- a/src/music/midifile.hpp
+++ b/src/music/midifile.hpp
@@ -36,11 +36,16 @@ struct MidiFile {
std::vector<TempoChange> tempos; ///< list of tempo changes in file
uint16 tickdiv; ///< ticks per quarter note
+ MidiFile();
+ ~MidiFile();
+
bool LoadFile(const char *filename);
bool LoadMpsData(const byte *data, size_t length);
bool LoadSong(const MusicSongInfo &song);
void MoveFrom(MidiFile &other);
+ bool WriteSMF(const char *filename);
+
static bool ReadSMFHeader(const char *filename, SMFHeader &header);
static bool ReadSMFHeader(FILE *file, SMFHeader &header);
};
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-11-25 16:14:30 +0000