Added ALSA MIDI example

Author Mitja Felicijan <mitja.felicijan@gmail.com> 2024-10-07 17:41:54 +0200
Committer Mitja Felicijan <mitja.felicijan@gmail.com> 2024-10-07 17:41:54 +0200
Commit 1eeba03da0222a117054eca53e7be8ee1e8bd970 (patch)
-rw-r--r-- .gitignore 1
-rw-r--r-- Makefile 5
-rw-r--r-- README.md 12
-rw-r--r-- example3.c 14
-rw-r--r-- example4.c 54
5 files changed, 78 insertions, 8 deletions
diff --git a/.gitignore b/.gitignore
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example1
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example1
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example2
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example2
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example3
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example3
 
  
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example4
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diff --git a/Makefile b/Makefile
...
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	$(CC) -Wall example2.c minisdl_audio.c -lm -ldl -lpthread -o example2
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	$(CC) -Wall example2.c minisdl_audio.c -lm -ldl -lpthread -o example2
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	$(CC) -Wall example3.c -L./portmidi -lportmidi -o example3
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	$(CC) -Wall example3.c -L./portmidi -lportmidi -o example3
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run-example3:
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run-example3: tests
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	LD_LIBRARY_PATH=./portmidi ./example3
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	LD_LIBRARY_PATH=./portmidi ./example3
 
  
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run-example4:
 
  
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	$(CC) example4.c -lasound -lm -o example4 && ./example4
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build-portmidi:
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build-portmidi:
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	cd portmidi && cmake . && make
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	cd portmidi && cmake . && make
diff --git a/README.md b/README.md
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# Tiny terminal DAW
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# Tiny terminal DAW
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`ttdaw` is a tiny terminal based digital audio workstation made for fun and
 
  
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experimentation and learning more about audio and MIDI in general.
 
  
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## Documentations
 
  
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- https://developer.apple.com/documentation/coremidi
 
  
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- https://www.alsa-project.org/alsa-doc/alsa-lib/seq.html
 
  
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## Reading material
 
  
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- https://www.izotope.com/en/learn/fundamental-frequency-harmonics.html
 
  
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## Soundfonts
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## Soundfonts
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- https://dev.nando.audio/pages/soundfonts.html
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- https://dev.nando.audio/pages/soundfonts.html
...
diff --git a/example3.c b/example3.c
...
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	}
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	}
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	/* // Open a MIDI input device */
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	/* // Open a MIDI input device */
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	/* stream = Pm_OpenInput(&err, NULL, NULL, NUM_INPUTS, NULL, 0); */
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	stream = (PortMidiStream *)Pm_OpenInput(&err, NULL, NULL, NUM_INPUTS, NULL, 0);
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	/* if (err != pmNoError) { */
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	if (err != pmNoError) {
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	/*     fprintf(stderr, "Error opening MIDI input device: %s\n", Pm_GetErrorText(err)); */
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	    fprintf(stderr, "Error opening MIDI input device: %s\n", Pm_GetErrorText(err));
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	/*     Pm_Terminate(); */
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	    Pm_Terminate();
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	/*     exit(1); */
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	    exit(1);
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	/* } */
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	}
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	/* // Read MIDI messages from the input device */
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	/* // Read MIDI messages from the input device */
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	/* while (1) { */
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	/* while (1) { */
...
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	/* } */
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	/* } */
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	/* // Close the MIDI input device */
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	/* // Close the MIDI input device */
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	/* Pm_Close(stream); */
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	Pm_Close(stream);
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	// Terminate PortMIDI
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	// Terminate PortMIDI
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	Pm_Terminate();
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	Pm_Terminate();
...
diff --git a/example4.c b/example4.c 
  
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#include <stdio.h>
 
  
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#include <stdlib.h>
 
  
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#include <alsa/asoundlib.h>
 
  
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#define CLIENT_NAME "ttdaw"
 
  
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#define MAX_MIDI_PORTS 4
 
  
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static snd_seq_t *seq_handle;
 
  
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static snd_seq_addr_t *ports;
 
  
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static int rate = 44100;
 
  
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int main(void) {
 
  
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	fprintf(stdout, "Example: Reading MIDI input\n");
 
  
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	snd_seq_t *seq_handle;
 
  
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	if (snd_seq_open(&seq_handle, "default", SND_SEQ_OPEN_DUPLEX, 0) < 0) {
 
  
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		fprintf(stderr, "Error opening ALSA sequencer.\n");
 
  
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		exit(1);
 
  
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	}
 
  
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	if (snd_seq_set_client_name(seq_handle, CLIENT_NAME) < 0) {
 
  
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		fprintf(stderr, "Could not set up client name.\n");
 
  
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		exit(1);
 
  
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	}
 
  
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	if (snd_seq_create_simple_port(seq_handle, CLIENT_NAME,
 
  
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				SND_SEQ_PORT_CAP_WRITE |
 
  
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				SND_SEQ_PORT_CAP_SUBS_WRITE,
 
  
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				SND_SEQ_PORT_TYPE_MIDI_GENERIC |
 
  
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				SND_SEQ_PORT_TYPE_APPLICATION) < 0) {
 
  
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		fprintf(stderr, "Error creating sequencer port.\n");
 
  
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		exit(1);
 
  
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	}
 
  
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	char *port_name = "28:0";
 
  
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	if (snd_seq_parse_address(seq_handle, &ports[0], port_name) < 0) {
 
  
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		fprintf(stderr, "Invalid port %s.\n", port_name);
 
  
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		exit(1);
 
  
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	}
 
  
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	// Connecting ports.
 
  
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	for (int i = 0; i < MAX_MIDI_PORTS; ++i) {
 
  
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		int err = snd_seq_connect_from(seq_handle, 0, ports[i].client, ports[i].port);
 
  
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		if (err < 0) {
 
  
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			fprintf(stderr, "Cannot connect from port %d:%d - %s", ports[i].client, ports[i].port, snd_strerror(err));
 
  
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			exit(1);
 
  
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		}
 
  
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	}
 
  
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	snd_seq_close(seq_handle);
 
  
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	return 0;
 
  
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}
 
  
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