MIDI file parsing homework - Revision history

Craig: /* Assignment */

2025-01-28T19:08:12Z

Assignment

← Older revision		Revision as of 19:08, 28 January 2025
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	# Find a MIDI file on the web or export MIDI from MuseScore.		# Find a MIDI file on the web or export MIDI from MuseScore.
	# Drag-and-drop the MIDI file into the box below to convert it to hex bytes: <br> <html><iframe style="overflow: hidden; width:750px; height:700px;" src="https://~~ccrma~~.~~stanford~~.~~edu~~/~craig/binasc"></iframe></html>		# Drag-and-drop the MIDI file into the box below to convert it to hex bytes: <br> <html><iframe style="overflow: hidden; width:750px; height:700px;" src="https://www.ccarh.org/~craig/binasc"></iframe></html>
	# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.		# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.
	# Parse at least 25 delta-time/message pairs in one of the tracks of the MIDI File. Note that type-1 files only store meta messages such as tempo changes in the first track. If your file is a type-1 file, try parsing a few of these meta messages, and then switch to another track with notes.		# Parse at least 25 delta-time/message pairs in one of the tracks of the MIDI File. Note that type-1 files only store meta messages such as tempo changes in the first track. If your file is a type-1 file, try parsing a few of these meta messages, and then switch to another track with notes.

Craig at 19:01, 28 January 2025

2025-01-28T19:01:56Z

← Older revision		Revision as of 19:01, 28 January 2025
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	# Find a MIDI file on the web or export MIDI from MuseScore.		# Find a MIDI file on the web or export MIDI from MuseScore.
	# Drag-and-drop the MIDI file into the box below to convert it to hex bytes: <br~~> <nowiki~~><html><iframe style="overflow: hidden; width:750px; height:700px;" src="https://ccrma.stanford.edu/~craig/binasc"></iframe></html~~></nowiki~~>		# Drag-and-drop the MIDI file into the box below to convert it to hex bytes: <br> <html><iframe style="overflow: hidden; width:750px; height:700px;" src="https://ccrma.stanford.edu/~craig/binasc"></iframe></html>
	# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.		# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.
	# Parse at least 25 delta-time/message pairs in one of the tracks of the MIDI File. Note that type-1 files only store meta messages such as tempo changes in the first track. If your file is a type-1 file, try parsing a few of these meta messages, and then switch to another track with notes.		# Parse at least 25 delta-time/message pairs in one of the tracks of the MIDI File. Note that type-1 files only store meta messages such as tempo changes in the first track. If your file is a type-1 file, try parsing a few of these meta messages, and then switch to another track with notes.

Craig: /* Assignment */

2025-01-28T19:01:28Z

Assignment

← Older revision		Revision as of 19:01, 28 January 2025
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	# Find a MIDI file on the web or export MIDI from MuseScore.		# Find a MIDI file on the web or export MIDI from MuseScore.
	# Drag-and-drop the MIDI file into the box below to convert it to hex bytes: <br> <nowiki><iframe style="overflow: hidden; width:750px; height:700px;" src="https://ccrma.stanford.edu/~craig/binasc"></iframe></nowiki>		# Drag-and-drop the MIDI file into the box below to convert it to hex bytes: <br> <nowiki><html><iframe style="overflow: hidden; width:750px; height:700px;" src="https://ccrma.stanford.edu/~craig/binasc"></iframe></html></nowiki>
	# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.		# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.
	# Parse at least 25 delta-time/message pairs in one of the tracks of the MIDI File. Note that type-1 files only store meta messages such as tempo changes in the first track. If your file is a type-1 file, try parsing a few of these meta messages, and then switch to another track with notes.		# Parse at least 25 delta-time/message pairs in one of the tracks of the MIDI File. Note that type-1 files only store meta messages such as tempo changes in the first track. If your file is a type-1 file, try parsing a few of these meta messages, and then switch to another track with notes.

Craig at 18:59, 28 January 2025

2025-01-28T18:59:29Z

← Older revision		Revision as of 18:59, 28 January 2025
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	# Find a MIDI file on the web or export MIDI from MuseScore.		# Find a MIDI file on the web or export MIDI from MuseScore.
	# Drag-and-drop the MIDI file into the box below to convert it to hex bytes: <br> <~~html~~><iframe style="overflow: hidden; width:750px; height:700px;" src="https://ccrma.stanford.edu/~craig/binasc"></iframe></~~html~~>		# Drag-and-drop the MIDI file into the box below to convert it to hex bytes: <br> <nowiki><iframe style="overflow: hidden; width:750px; height:700px;" src="https://ccrma.stanford.edu/~craig/binasc"></iframe></nowiki>
	# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.		# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.
	# Parse at least 25 delta-time/message pairs in one of the tracks of the MIDI File. Note that type-1 files only store meta messages such as tempo changes in the first track. If your file is a type-1 file, try parsing a few of these meta messages, and then switch to another track with notes.		# Parse at least 25 delta-time/message pairs in one of the tracks of the MIDI File. Note that type-1 files only store meta messages such as tempo changes in the first track. If your file is a type-1 file, try parsing a few of these meta messages, and then switch to another track with notes.

Craig: /* Example */

2022-01-25T07:44:30Z

Example

← Older revision		Revision as of 07:44, 25 January 2022
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	ff 2f 00		ff 2f 00

	Example of more ~~detailed parsing~~:		Example of more decoding VLV numbers and converting MIDI data bytes to decimal:

	4d 54 68 64 MIDI header chunk marker ("MThd")		4d 54 68 64 MIDI header chunk marker ("MThd")

Craig at 07:42, 25 January 2022

2022-01-25T07:42:43Z

← Older revision		Revision as of 07:42, 25 January 2022
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	== Assignment ==		== Assignment ==

	# Find a MIDI file on the web or export MIDI from MuseScore. Tip: include <em>[https://www.google.com/search?q=filetype%3Amidi&lr=lang_en filetype:midi]</em>or <em>[https://www.google.com/search?q=filetype%3Amid&lr=lang_en filetype:mid]</em> when searching for MIDI files in Google searches.		# Find a MIDI file on the web or export MIDI from MuseScore.
	# Drag-and-drop the MIDI file into the box below to convert it to hex bytes: <br> <html><iframe style="overflow: hidden; width:750px; height:700px;" src="https://ccrma.stanford.edu/~craig/binasc"></iframe></html>		# Drag-and-drop the MIDI file into the box below to convert it to hex bytes: <br> <html><iframe style="overflow: hidden; width:750px; height:700px;" src="https://ccrma.stanford.edu/~craig/binasc"></iframe></html>
	# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.		# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.

Craig: /* Assignment */

2021-01-31T08:34:14Z

Assignment

← Older revision		Revision as of 08:34, 31 January 2021
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	# Find a MIDI file on the web or export MIDI from MuseScore. Tip: include <em>[https://www.google.com/search?q=filetype%3Amidi&lr=lang_en filetype:midi]</em>or <em>[https://www.google.com/search?q=filetype%3Amid&lr=lang_en filetype:mid]</em> when searching for MIDI files in Google searches.		# Find a MIDI file on the web or export MIDI from MuseScore. Tip: include <em>[https://www.google.com/search?q=filetype%3Amidi&lr=lang_en filetype:midi]</em>or <em>[https://www.google.com/search?q=filetype%3Amid&lr=lang_en filetype:mid]</em> when searching for MIDI files in Google searches.
			# Drag-and-drop the MIDI file into the box below to convert it to hex bytes: <br> <html><iframe style="overflow: hidden; width:750px; height:700px;" src="https://ccrma.stanford.edu/~craig/binasc"></iframe></html>
	# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.		# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.
	# Parse at least 25 delta-time/message pairs in one of the tracks of the MIDI File. Note that type-1 files only store meta messages such as tempo changes in the first track. If your file is a type-1 file, try parsing a few of these meta messages, and then switch to another track with notes.		# Parse at least 25 delta-time/message pairs in one of the tracks of the MIDI File. Note that type-1 files only store meta messages such as tempo changes in the first track. If your file is a type-1 file, try parsing a few of these meta messages, and then switch to another track with notes.

Craig: /* Assignment */

2021-01-31T08:28:34Z

Assignment

← Older revision		Revision as of 08:28, 31 January 2021
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	# Does the MIDI file use "running status"? Running status would result in the first byte of a MIDI message in any (delta-time/message) pair to be a data byte rather than a command-byte (and the last command-byte in the track would be the inferred command byte).		# Does the MIDI file use "running status"? Running status would result in the first byte of a MIDI message in any (delta-time/message) pair to be a data byte rather than a command-byte (and the last command-byte in the track would be the inferred command byte).
	# Decoding VLVs for delta timings is optional.		# Decoding VLVs for delta timings is optional.
	# ~~<em>Extra Credit</em>: If decoding the VLV values, does~~ the MIDI file look like it was performed live, or does it represent quantized/proportional time? In other words, ~~if the ratio~~ of ~~time values looks like integers~~, ~~such as 2:1 for quarter-note:eighth note, then it could not possibly be performed so accurately.~~		# Does the MIDI file look like it was performed live? or does it represent quantized/proportional time? In other words, is there a variety of VHV or decoded delta ticks, or are there only a small set of unique delta times?
	# <em>Extra Credit</em>: Write your own Standard MIDI File parser which will do this homework for you.		# <em>Extra Credit</em>: Write your own Standard MIDI File parser which will do this homework for you.
	# Email MIDI file and your parsing to you-know-whos.		# Email MIDI file and your parsing to you-know-whos.

Craig: /* Assignment */

2021-01-31T08:25:43Z

Assignment

← Older revision		Revision as of 08:25, 31 January 2021
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	# Find a MIDI file on the web or export MIDI from MuseScore. Tip: include <em>[https://www.google.com/search?q=filetype%3Amidi&lr=lang_en filetype:midi]</em>or <em>[https://www.google.com/search?q=filetype%3Amid&lr=lang_en filetype:mid]</em> when searching for MIDI files in Google searches.		# Find a MIDI file on the web or export MIDI from MuseScore. Tip: include <em>[https://www.google.com/search?q=filetype%3Amidi&lr=lang_en filetype:midi]</em>or <em>[https://www.google.com/search?q=filetype%3Amid&lr=lang_en filetype:mid]</em> when searching for MIDI files in Google searches.
	# Save the MIDI file to your desktop and open it (usually double-clicking to open with the default MIDI playing program on your computer). [[Quicktime \| Here are instructions for installing an older version of Quicktime in OS X]] which plays MIDI files.
	# If it plays correctly, drag and drop the MIDI file from your desktop into the box below: <br> <html><iframe style="overflow: hidden; width:750px; height:700px;" src="https://ccrma.stanford.edu/~craig/binasc"></iframe></html>
	# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.		# Parse the resulting display of the MIDI file's hexadecimal bytes by hand. Make note of the number of tracks in the file; whether it is type-0 or type-1 (or type-2), and how many ticks per quarter note are used for basic timing in the file.
	# Parse at least 25 delta-time/message pairs in one of the tracks of the MIDI File. Note that type-1 files only store meta messages such as tempo changes in the first track. If your file is a type-1 file, try parsing a few of these meta messages, and then switch to another track with notes.		# Parse at least 25 delta-time/message pairs in one of the tracks of the MIDI File. Note that type-1 files only store meta messages such as tempo changes in the first track. If your file is a type-1 file, try parsing a few of these meta messages, and then switch to another track with notes.

Craig: /* Assignment */

2021-01-31T08:25:09Z

Assignment

← Older revision		Revision as of 08:25, 31 January 2021
Line 1:		Line 1:
	== Assignment ==		== Assignment ==

	# Find a MIDI file on the web. Tip: include <em>[https://www.google.com/search?q=filetype%3Amidi&lr=lang_en filetype:midi]</em>or <em>[https://www.google.com/search?q=filetype%3Amid&lr=lang_en filetype:mid]</em> when searching for MIDI files in Google searches.		# Find a MIDI file on the web or export MIDI from MuseScore. Tip: include <em>[https://www.google.com/search?q=filetype%3Amidi&lr=lang_en filetype:midi]</em>or <em>[https://www.google.com/search?q=filetype%3Amid&lr=lang_en filetype:mid]</em> when searching for MIDI files in Google searches.
	# Save the MIDI file to your desktop and open it (usually double-clicking to open with the default MIDI playing program on your computer). [[Quicktime \| Here are instructions for installing an older version of Quicktime in OS X]] which plays MIDI files.		# Save the MIDI file to your desktop and open it (usually double-clicking to open with the default MIDI playing program on your computer). [[Quicktime \| Here are instructions for installing an older version of Quicktime in OS X]] which plays MIDI files.
	# If it plays correctly, drag and drop the MIDI file from your desktop into the box below: <br> <html><iframe style="overflow: hidden; width:750px; height:700px;" src="https://ccrma.stanford.edu/~craig/binasc"></iframe></html>		# If it plays correctly, drag and drop the MIDI file from your desktop into the box below: <br> <html><iframe style="overflow: hidden; width:750px; height:700px;" src="https://ccrma.stanford.edu/~craig/binasc"></iframe></html>