From 65ffdf410ca5c36f059bee8619f87147f802a82e Mon Sep 17 00:00:00 2001 From: Mitja Felicijan Date: Tue, 8 Oct 2024 06:05:51 +0200 Subject: Renamed to experiments and added watch for changes --- .gitignore | 4 -- examples/Makefile | 5 -- examples/example1.c | 81 ----------------------- examples/example2.c | 76 ---------------------- examples/example4.c | 127 ------------------------------------- experiments/.gitignore | 5 ++ experiments/Makefile | 22 +++++++ experiments/alsa_midi_controller.c | 124 ++++++++++++++++++++++++++++++++++++ experiments/soundfont_basic.c | 81 +++++++++++++++++++++++ experiments/soundfont_from_file.c | 76 ++++++++++++++++++++++ experiments/watch_file_changes.c | 30 +++++++++ experiments/watch_file_changes.txt | 3 + 12 files changed, 341 insertions(+), 293 deletions(-) delete mode 100644 examples/Makefile delete mode 100644 examples/example1.c delete mode 100644 examples/example2.c delete mode 100644 examples/example4.c create mode 100644 experiments/.gitignore create mode 100644 experiments/Makefile create mode 100644 experiments/alsa_midi_controller.c create mode 100644 experiments/soundfont_basic.c create mode 100644 experiments/soundfont_from_file.c create mode 100644 experiments/watch_file_changes.c create mode 100644 experiments/watch_file_changes.txt diff --git a/.gitignore b/.gitignore index e67c165..b541578 100644 --- a/.gitignore +++ b/.gitignore @@ -1,6 +1,2 @@ -examples/example1 -examples/example2 -examples/example3 -examples/example4 ttdaw diff --git a/examples/Makefile b/examples/Makefile deleted file mode 100644 index 5f77125..0000000 --- a/examples/Makefile +++ /dev/null @@ -1,5 +0,0 @@ -tests: - $(CC) -Wall example1.c ../minisdl_audio.c -lm -ldl -lpthread -o example1 - $(CC) -Wall example2.c ../minisdl_audio.c -lm -ldl -lpthread -o example2 - $(CC) -Wall example4.c -lasound -lm -o example4 - diff --git a/examples/example1.c b/examples/example1.c deleted file mode 100644 index 91800ad..0000000 --- a/examples/example1.c +++ /dev/null @@ -1,81 +0,0 @@ -#define TSF_IMPLEMENTATION -#include "../tsf.h" - -#include "../minisdl_audio.h" - -//This is a minimal SoundFont with a single loopin saw-wave sample/instrument/preset (484 bytes) -const static unsigned char MinimalSoundFont[] = { -#define TEN0 0,0,0,0,0,0,0,0,0,0 - 'R','I','F','F',220,1,0,0,'s','f','b','k', - 'L','I','S','T',88,1,0,0,'p','d','t','a', - 'p','h','d','r',76,TEN0,TEN0,TEN0,TEN0,0,0,0,0,TEN0,0,0,0,0,0,0,0,255,0,255,0,1,TEN0,0,0,0, - 'p','b','a','g',8,0,0,0,0,0,0,0,1,0,0,0,'p','m','o','d',10,TEN0,0,0,0,'p','g','e','n',8,0,0,0,41,0,0,0,0,0,0,0, - 'i','n','s','t',44,TEN0,TEN0,0,0,0,0,0,0,0,0,TEN0,0,0,0,0,0,0,0,1,0, - 'i','b','a','g',8,0,0,0,0,0,0,0,2,0,0,0,'i','m','o','d',10,TEN0,0,0,0, - 'i','g','e','n',12,0,0,0,54,0,1,0,53,0,0,0,0,0,0,0, - 's','h','d','r',92,TEN0,TEN0,0,0,0,0,0,0,0,50,0,0,0,0,0,0,0,49,0,0,0,34,86,0,0,60,0,0,0,1,TEN0,TEN0,TEN0,TEN0,0,0,0,0,0,0,0, - 'L','I','S','T',112,0,0,0,'s','d','t','a','s','m','p','l',100,0,0,0,86,0,119,3,31,7,147,10,43,14,169,17,58,21,189,24,73,28,204,31,73,35,249,38,46,42,71,46,250,48,150,53,242,55,126,60,151,63,108,66,126,72,207, - 70,86,83,100,72,74,100,163,39,241,163,59,175,59,179,9,179,134,187,6,186,2,194,5,194,15,200,6,202,96,206,159,209,35,213,213,216,45,220,221,223,76,227,221,230,91,234,242,237,105,241,8,245,118,248,32,252 -}; - -// Holds the global instance pointer -static tsf* g_TinySoundFont; - -// Callback function called by the audio thread -static void AudioCallback(void* data, Uint8 *stream, int len) { - // Note we don't do any thread concurrency control here because in this - // example all notes are started before the audio playback begins. - // If you do play notes while the audio thread renders output you - // will need a mutex of some sort. - int SampleCount = (len / (2 * sizeof(short))); //2 output channels - tsf_render_short(g_TinySoundFont, (short*)stream, SampleCount, 0); -} - -int main(int argc, char *argv[]) { - // Define the desired audio output format we request - SDL_AudioSpec OutputAudioSpec; - OutputAudioSpec.freq = 44100; - OutputAudioSpec.format = AUDIO_S16; - OutputAudioSpec.channels = 2; - OutputAudioSpec.samples = 4096; - OutputAudioSpec.callback = AudioCallback; - - // Initialize the audio system - if (SDL_AudioInit(NULL) < 0) { - fprintf(stderr, "Could not initialize audio hardware or driver\n"); - return 1; - } - - // Load the SoundFont from the memory block - g_TinySoundFont = tsf_load_memory(MinimalSoundFont, sizeof(MinimalSoundFont)); - if (!g_TinySoundFont) { - fprintf(stderr, "Could not load soundfont\n"); - return 1; - } - - // Set the rendering output mode to 44.1khz and -10 decibel gain - tsf_set_output(g_TinySoundFont, TSF_STEREO_INTERLEAVED, OutputAudioSpec.freq, -10); - - // Start two notes before starting the audio playback - tsf_note_on(g_TinySoundFont, 0, 48, 1.0f); //C2 - tsf_note_on(g_TinySoundFont, 0, 52, 1.0f); //E2 - - // Request the desired audio output format - if (SDL_OpenAudio(&OutputAudioSpec, NULL) < 0) { - fprintf(stderr, "Could not open the audio hardware or the desired audio output format\n"); - return 1; - } - - // Start the actual audio playback here - // The audio thread will begin to call our AudioCallback function - SDL_PauseAudio(0); - - // Let the audio callback play some sound for 3 seconds - SDL_Delay(3000); - - // We could call tsf_close(g_TinySoundFont) and SDL_DestroyMutex(g_Mutex) - // here to free the memory and resources but we just let the OS clean up - // because the process ends here. - return 0; -} - diff --git a/examples/example2.c b/examples/example2.c deleted file mode 100644 index 8518744..0000000 --- a/examples/example2.c +++ /dev/null @@ -1,76 +0,0 @@ -#include "../minisdl_audio.h" - -#define TSF_IMPLEMENTATION -#include "../tsf.h" - -// Holds the global instance pointer -static tsf* g_TinySoundFont; - -// A Mutex so we don't call note_on/note_off while rendering audio samples -static SDL_mutex* g_Mutex; - -static void AudioCallback(void* data, Uint8 *stream, int len) { - // Render the audio samples in float format - int SampleCount = (len / (2 * sizeof(float))); //2 output channels - SDL_LockMutex(g_Mutex); //get exclusive lock - tsf_render_float(g_TinySoundFont, (float*)stream, SampleCount, 0); - SDL_UnlockMutex(g_Mutex); -} - -int main(int argc, char *argv[]) { - int i, Notes[7] = { 48, 50, 52, 53, 55, 57, 59 }; - - // Define the desired audio output format we request - SDL_AudioSpec OutputAudioSpec; - OutputAudioSpec.freq = 44100; - OutputAudioSpec.format = AUDIO_F32; - OutputAudioSpec.channels = 2; - OutputAudioSpec.samples = 4096; - OutputAudioSpec.callback = AudioCallback; - - // Initialize the audio system - if (SDL_AudioInit(TSF_NULL) < 0) { - fprintf(stderr, "Could not initialize audio hardware or driver\n"); - return 1; - } - - // Load the SoundFont from a file - g_TinySoundFont = tsf_load_filename("../soundfonts/florestan-subset.sf2"); - if (!g_TinySoundFont) { - fprintf(stderr, "Could not load SoundFont\n"); - return 1; - } - - // Set the SoundFont rendering output mode - tsf_set_output(g_TinySoundFont, TSF_STEREO_INTERLEAVED, OutputAudioSpec.freq, 0); - - // Create the mutex - g_Mutex = SDL_CreateMutex(); - - // Request the desired audio output format - if (SDL_OpenAudio(&OutputAudioSpec, TSF_NULL) < 0) { - fprintf(stderr, "Could not open the audio hardware or the desired audio output format\n"); - return 1; - } - - // Start the actual audio playback here - // The audio thread will begin to call our AudioCallback function - SDL_PauseAudio(0); - - // Loop through all the presets in the loaded SoundFont - for (i = 0; i < tsf_get_presetcount(g_TinySoundFont); i++) { - //Get exclusive mutex lock, end the previous note and play a new note - printf("Play note %d with preset #%d '%s'\n", Notes[i % 7], i, tsf_get_presetname(g_TinySoundFont, i)); - SDL_LockMutex(g_Mutex); - tsf_note_off(g_TinySoundFont, i - 1, Notes[(i - 1) % 7]); - tsf_note_on(g_TinySoundFont, i, Notes[i % 7], 1.0f); - SDL_UnlockMutex(g_Mutex); - SDL_Delay(1000); - } - - // We could call tsf_close(g_TinySoundFont) and SDL_DestroyMutex(g_Mutex) - // here to free the memory and resources but we just let the OS clean up - // because the process ends here. - return 0; -} - diff --git a/examples/example4.c b/examples/example4.c deleted file mode 100644 index 1dc9ebe..0000000 --- a/examples/example4.c +++ /dev/null @@ -1,127 +0,0 @@ -#include -#include -#include -#include -#include - -#define CLIENT_NAME "ttdaw" -#define MAX_MIDI_PORTS 1 - -static snd_seq_t *seq_handle; -static snd_seq_addr_t *ports; -static int rate = 44100; -static int stop = 0; - -static void sighandler(int sig ATTRIBUTE_UNUSED) { - stop = 1; -} - -int main(void) { - fprintf(stdout, "Example: Reading MIDI input\n"); - - snd_seq_t *seq_handle; - - if (snd_seq_open(&seq_handle, "default", SND_SEQ_OPEN_DUPLEX, 0) < 0) { - fprintf(stderr, "Error opening ALSA sequencer.\n"); - exit(1); - } - - if (snd_seq_set_client_name(seq_handle, CLIENT_NAME) < 0) { - fprintf(stderr, "Could not set up client name.\n"); - exit(1); - } - - if (snd_seq_create_simple_port(seq_handle, CLIENT_NAME, - SND_SEQ_PORT_CAP_WRITE | - SND_SEQ_PORT_CAP_SUBS_WRITE, - SND_SEQ_PORT_TYPE_MIDI_GENERIC | - SND_SEQ_PORT_TYPE_APPLICATION) < 0) { - fprintf(stderr, "Error creating sequencer port.\n"); - exit(1); - } - - // Connecting ports. - char *port_name = "28:0"; - ports = realloc(ports, MAX_MIDI_PORTS * sizeof(snd_seq_addr_t)); - if (snd_seq_parse_address(seq_handle, &ports[0], port_name) < 0) { - fprintf(stderr, "Invalid port %s.\n", port_name); - exit(1); - } - - // Listing assigned ports. - fprintf(stdout, "Ports:\n"); - for (int j = 0; j < MAX_MIDI_PORTS; j++) { - fprintf(stdout, " client: %d, port: %d\n", ports[j].client, ports[j].port); - } - - // Connecting ports. - for (int i = 0; i < MAX_MIDI_PORTS; ++i) { - int err = snd_seq_connect_from(seq_handle, 0, ports[i].client, ports[i].port); - if (err < 0) { - fprintf(stderr, "Cannot connect from port %d:%d - %s", ports[i].client, ports[i].port, snd_strerror(err)); - exit(1); - } - } - - if (snd_seq_nonblock(seq_handle, 1) < 0) { - fprintf(stderr, "Set nonblock mode failed."); - exit(1); - } - - signal(SIGINT, sighandler); - signal(SIGTERM, sighandler); - - // Reading MIDI device. - struct pollfd *pfds; - size_t npfds; - - npfds = snd_seq_poll_descriptors_count(seq_handle, POLLIN); - pfds = alloca(sizeof(*pfds) * npfds); - - for (;;) { - snd_seq_poll_descriptors(seq_handle, pfds, npfds, POLLIN); - if (poll(pfds, npfds, -1) < 0) { - break; - } - - for (;;) { - snd_seq_event_t *ev; - - if (snd_seq_event_input(seq_handle, &ev) < 0) { - break; - } - - if (ev) { - switch (ev->type) { - case SND_SEQ_EVENT_NOTEON: - printf("%3d:%-3dNote on %2d, note %d, velocity: %3d\n", - ev->source.client, ev->source.port, - ev->data.note.channel, - ev->data.note.note, - ev->data.note.velocity); - break; - - case SND_SEQ_EVENT_NOTEOFF: - printf("%3d:%-3dNote off\t%2d, note %d\n", - ev->source.client, ev->source.port, - ev->data.note.channel, - ev->data.note.note); - break; - - - } - } - } - - fflush(stdout); - - if (stop) { - break; - } - } - - fprintf(stdout, "Finishing up\n"); - snd_seq_close(seq_handle); - return 0; -} - diff --git a/experiments/.gitignore b/experiments/.gitignore new file mode 100644 index 0000000..aceb7f8 --- /dev/null +++ b/experiments/.gitignore @@ -0,0 +1,5 @@ +alsa_midi_controller +soundfont_basic +soundfont_from_file +watch_file_changes + diff --git a/experiments/Makefile b/experiments/Makefile new file mode 100644 index 0000000..ad822f5 --- /dev/null +++ b/experiments/Makefile @@ -0,0 +1,22 @@ +CC := cc +CFLAGS := -Wall +LDFLAGS := -lm -ldl -lpthread -lasound + +all: \ + soundfont_basic \ + soundfont_from_file \ + alsa_midi_controller \ + watch_file_changes + +soundfont_basic: soundfont_basic.c + $(CC) $(CFLAGS) soundfont_basic.c ../minisdl_audio.c $(LDFLAGS) -o soundfont_basic + +soundfont_from_file: soundfont_from_file.c + $(CC) $(CFLAGS) soundfont_from_file.c ../minisdl_audio.c $(LDFLAGS) -o soundfont_from_file + +alsa_midi_controller: alsa_midi_controller.c + $(CC) $(CFLAGS) alsa_midi_controller.c $(LDFLAGS) -o alsa_midi_controller + +watch_file_changes: watch_file_changes.c + $(CC) $(CFLAGS) watch_file_changes.c $(LDFLAGS) -o watch_file_changes + diff --git a/experiments/alsa_midi_controller.c b/experiments/alsa_midi_controller.c new file mode 100644 index 0000000..3181c29 --- /dev/null +++ b/experiments/alsa_midi_controller.c @@ -0,0 +1,124 @@ +#include +#include +#include +#include +#include + +#define CLIENT_NAME "ttdaw" +#define MAX_MIDI_PORTS 1 + +static snd_seq_t *seq_handle; +static snd_seq_addr_t *ports; +static int stop = 0; + +static void sighandler(int sig ATTRIBUTE_UNUSED) { + stop = 1; +} + +int main(void) { + fprintf(stdout, "Example: Reading MIDI input\n"); + + if (snd_seq_open(&seq_handle, "default", SND_SEQ_OPEN_DUPLEX, 0) < 0) { + fprintf(stderr, "Error opening ALSA sequencer.\n"); + exit(1); + } + + if (snd_seq_set_client_name(seq_handle, CLIENT_NAME) < 0) { + fprintf(stderr, "Could not set up client name.\n"); + exit(1); + } + + if (snd_seq_create_simple_port(seq_handle, CLIENT_NAME, + SND_SEQ_PORT_CAP_WRITE | + SND_SEQ_PORT_CAP_SUBS_WRITE, + SND_SEQ_PORT_TYPE_MIDI_GENERIC | + SND_SEQ_PORT_TYPE_APPLICATION) < 0) { + fprintf(stderr, "Error creating sequencer port.\n"); + exit(1); + } + + // Connecting ports. + char *port_name = "28:0"; + ports = realloc(ports, MAX_MIDI_PORTS * sizeof(snd_seq_addr_t)); + if (snd_seq_parse_address(seq_handle, &ports[0], port_name) < 0) { + fprintf(stderr, "Invalid port %s.\n", port_name); + exit(1); + } + + // Listing assigned ports. + fprintf(stdout, "Ports:\n"); + for (int j = 0; j < MAX_MIDI_PORTS; j++) { + fprintf(stdout, " client: %d, port: %d\n", ports[j].client, ports[j].port); + } + + // Connecting ports. + for (int i = 0; i < MAX_MIDI_PORTS; ++i) { + int err = snd_seq_connect_from(seq_handle, 0, ports[i].client, ports[i].port); + if (err < 0) { + fprintf(stderr, "Cannot connect from port %d:%d - %s", ports[i].client, ports[i].port, snd_strerror(err)); + exit(1); + } + } + + if (snd_seq_nonblock(seq_handle, 1) < 0) { + fprintf(stderr, "Set nonblock mode failed."); + exit(1); + } + + signal(SIGINT, sighandler); + signal(SIGTERM, sighandler); + + // Reading MIDI device. + struct pollfd *pfds; + size_t npfds; + + npfds = snd_seq_poll_descriptors_count(seq_handle, POLLIN); + pfds = alloca(sizeof(*pfds) * npfds); + + for (;;) { + snd_seq_poll_descriptors(seq_handle, pfds, npfds, POLLIN); + if (poll(pfds, npfds, -1) < 0) { + break; + } + + for (;;) { + snd_seq_event_t *ev; + + if (snd_seq_event_input(seq_handle, &ev) < 0) { + break; + } + + if (ev) { + switch (ev->type) { + case SND_SEQ_EVENT_NOTEON: + printf("%3d:%-3dNote on %2d, note %d, velocity: %3d\n", + ev->source.client, ev->source.port, + ev->data.note.channel, + ev->data.note.note, + ev->data.note.velocity); + break; + + case SND_SEQ_EVENT_NOTEOFF: + printf("%3d:%-3dNote off\t%2d, note %d\n", + ev->source.client, ev->source.port, + ev->data.note.channel, + ev->data.note.note); + break; + + + } + } + } + + fflush(stdout); + + if (stop) { + break; + } + } + + fprintf(stdout, "Finishing up\n"); + snd_seq_close(seq_handle); + return 0; +} + diff --git a/experiments/soundfont_basic.c b/experiments/soundfont_basic.c new file mode 100644 index 0000000..91800ad --- /dev/null +++ b/experiments/soundfont_basic.c @@ -0,0 +1,81 @@ +#define TSF_IMPLEMENTATION +#include "../tsf.h" + +#include "../minisdl_audio.h" + +//This is a minimal SoundFont with a single loopin saw-wave sample/instrument/preset (484 bytes) +const static unsigned char MinimalSoundFont[] = { +#define TEN0 0,0,0,0,0,0,0,0,0,0 + 'R','I','F','F',220,1,0,0,'s','f','b','k', + 'L','I','S','T',88,1,0,0,'p','d','t','a', + 'p','h','d','r',76,TEN0,TEN0,TEN0,TEN0,0,0,0,0,TEN0,0,0,0,0,0,0,0,255,0,255,0,1,TEN0,0,0,0, + 'p','b','a','g',8,0,0,0,0,0,0,0,1,0,0,0,'p','m','o','d',10,TEN0,0,0,0,'p','g','e','n',8,0,0,0,41,0,0,0,0,0,0,0, + 'i','n','s','t',44,TEN0,TEN0,0,0,0,0,0,0,0,0,TEN0,0,0,0,0,0,0,0,1,0, + 'i','b','a','g',8,0,0,0,0,0,0,0,2,0,0,0,'i','m','o','d',10,TEN0,0,0,0, + 'i','g','e','n',12,0,0,0,54,0,1,0,53,0,0,0,0,0,0,0, + 's','h','d','r',92,TEN0,TEN0,0,0,0,0,0,0,0,50,0,0,0,0,0,0,0,49,0,0,0,34,86,0,0,60,0,0,0,1,TEN0,TEN0,TEN0,TEN0,0,0,0,0,0,0,0, + 'L','I','S','T',112,0,0,0,'s','d','t','a','s','m','p','l',100,0,0,0,86,0,119,3,31,7,147,10,43,14,169,17,58,21,189,24,73,28,204,31,73,35,249,38,46,42,71,46,250,48,150,53,242,55,126,60,151,63,108,66,126,72,207, + 70,86,83,100,72,74,100,163,39,241,163,59,175,59,179,9,179,134,187,6,186,2,194,5,194,15,200,6,202,96,206,159,209,35,213,213,216,45,220,221,223,76,227,221,230,91,234,242,237,105,241,8,245,118,248,32,252 +}; + +// Holds the global instance pointer +static tsf* g_TinySoundFont; + +// Callback function called by the audio thread +static void AudioCallback(void* data, Uint8 *stream, int len) { + // Note we don't do any thread concurrency control here because in this + // example all notes are started before the audio playback begins. + // If you do play notes while the audio thread renders output you + // will need a mutex of some sort. + int SampleCount = (len / (2 * sizeof(short))); //2 output channels + tsf_render_short(g_TinySoundFont, (short*)stream, SampleCount, 0); +} + +int main(int argc, char *argv[]) { + // Define the desired audio output format we request + SDL_AudioSpec OutputAudioSpec; + OutputAudioSpec.freq = 44100; + OutputAudioSpec.format = AUDIO_S16; + OutputAudioSpec.channels = 2; + OutputAudioSpec.samples = 4096; + OutputAudioSpec.callback = AudioCallback; + + // Initialize the audio system + if (SDL_AudioInit(NULL) < 0) { + fprintf(stderr, "Could not initialize audio hardware or driver\n"); + return 1; + } + + // Load the SoundFont from the memory block + g_TinySoundFont = tsf_load_memory(MinimalSoundFont, sizeof(MinimalSoundFont)); + if (!g_TinySoundFont) { + fprintf(stderr, "Could not load soundfont\n"); + return 1; + } + + // Set the rendering output mode to 44.1khz and -10 decibel gain + tsf_set_output(g_TinySoundFont, TSF_STEREO_INTERLEAVED, OutputAudioSpec.freq, -10); + + // Start two notes before starting the audio playback + tsf_note_on(g_TinySoundFont, 0, 48, 1.0f); //C2 + tsf_note_on(g_TinySoundFont, 0, 52, 1.0f); //E2 + + // Request the desired audio output format + if (SDL_OpenAudio(&OutputAudioSpec, NULL) < 0) { + fprintf(stderr, "Could not open the audio hardware or the desired audio output format\n"); + return 1; + } + + // Start the actual audio playback here + // The audio thread will begin to call our AudioCallback function + SDL_PauseAudio(0); + + // Let the audio callback play some sound for 3 seconds + SDL_Delay(3000); + + // We could call tsf_close(g_TinySoundFont) and SDL_DestroyMutex(g_Mutex) + // here to free the memory and resources but we just let the OS clean up + // because the process ends here. + return 0; +} + diff --git a/experiments/soundfont_from_file.c b/experiments/soundfont_from_file.c new file mode 100644 index 0000000..8518744 --- /dev/null +++ b/experiments/soundfont_from_file.c @@ -0,0 +1,76 @@ +#include "../minisdl_audio.h" + +#define TSF_IMPLEMENTATION +#include "../tsf.h" + +// Holds the global instance pointer +static tsf* g_TinySoundFont; + +// A Mutex so we don't call note_on/note_off while rendering audio samples +static SDL_mutex* g_Mutex; + +static void AudioCallback(void* data, Uint8 *stream, int len) { + // Render the audio samples in float format + int SampleCount = (len / (2 * sizeof(float))); //2 output channels + SDL_LockMutex(g_Mutex); //get exclusive lock + tsf_render_float(g_TinySoundFont, (float*)stream, SampleCount, 0); + SDL_UnlockMutex(g_Mutex); +} + +int main(int argc, char *argv[]) { + int i, Notes[7] = { 48, 50, 52, 53, 55, 57, 59 }; + + // Define the desired audio output format we request + SDL_AudioSpec OutputAudioSpec; + OutputAudioSpec.freq = 44100; + OutputAudioSpec.format = AUDIO_F32; + OutputAudioSpec.channels = 2; + OutputAudioSpec.samples = 4096; + OutputAudioSpec.callback = AudioCallback; + + // Initialize the audio system + if (SDL_AudioInit(TSF_NULL) < 0) { + fprintf(stderr, "Could not initialize audio hardware or driver\n"); + return 1; + } + + // Load the SoundFont from a file + g_TinySoundFont = tsf_load_filename("../soundfonts/florestan-subset.sf2"); + if (!g_TinySoundFont) { + fprintf(stderr, "Could not load SoundFont\n"); + return 1; + } + + // Set the SoundFont rendering output mode + tsf_set_output(g_TinySoundFont, TSF_STEREO_INTERLEAVED, OutputAudioSpec.freq, 0); + + // Create the mutex + g_Mutex = SDL_CreateMutex(); + + // Request the desired audio output format + if (SDL_OpenAudio(&OutputAudioSpec, TSF_NULL) < 0) { + fprintf(stderr, "Could not open the audio hardware or the desired audio output format\n"); + return 1; + } + + // Start the actual audio playback here + // The audio thread will begin to call our AudioCallback function + SDL_PauseAudio(0); + + // Loop through all the presets in the loaded SoundFont + for (i = 0; i < tsf_get_presetcount(g_TinySoundFont); i++) { + //Get exclusive mutex lock, end the previous note and play a new note + printf("Play note %d with preset #%d '%s'\n", Notes[i % 7], i, tsf_get_presetname(g_TinySoundFont, i)); + SDL_LockMutex(g_Mutex); + tsf_note_off(g_TinySoundFont, i - 1, Notes[(i - 1) % 7]); + tsf_note_on(g_TinySoundFont, i, Notes[i % 7], 1.0f); + SDL_UnlockMutex(g_Mutex); + SDL_Delay(1000); + } + + // We could call tsf_close(g_TinySoundFont) and SDL_DestroyMutex(g_Mutex) + // here to free the memory and resources but we just let the OS clean up + // because the process ends here. + return 0; +} + diff --git a/experiments/watch_file_changes.c b/experiments/watch_file_changes.c new file mode 100644 index 0000000..04fd3b2 --- /dev/null +++ b/experiments/watch_file_changes.c @@ -0,0 +1,30 @@ +#include +#include +#include +#include + +int main(void) { + struct stat file_stat; + time_t last_mod_time; + const char* file = "watch_file_changes.txt"; + + stat(file, &file_stat); + last_mod_time = file_stat.st_mtime; + + while (1) { + sleep(1); + stat(file, &file_stat); + if (file_stat.st_mtime != last_mod_time) { + last_mod_time = file_stat.st_mtime; + + struct tm* time_info = localtime(&last_mod_time); + char formatted_time[9]; + strftime(formatted_time, sizeof(formatted_time), "%H:%M:%S", time_info); + + printf("File %s changed at %s\n", file, formatted_time); + } + } + printf("hi\n"); + return 0; +} + diff --git a/experiments/watch_file_changes.txt b/experiments/watch_file_changes.txt new file mode 100644 index 0000000..9de6d55 --- /dev/null +++ b/experiments/watch_file_changes.txt @@ -0,0 +1,3 @@ +test1 +test2 + -- cgit v1.2.3