ref: 40d48401892ddcb0a196dbcbea9261b92bfcf3c5
dir: /examples/example3.c/
#include "minisdl_audio.h" #define TSF_IMPLEMENTATION #include "../tsf.h" #define TML_IMPLEMENTATION #include "../tml.h" // Holds the global instance pointer static tsf* g_TinySoundFont; // Holds global MIDI playback state static double g_Msec; //current playback time static tml_message* g_MidiMessage; //next message to be played // Callback function called by the audio thread static void AudioCallback(void* data, Uint8 *stream, int len) { //Number of samples to process int SampleBlock, SampleCount = (len / (2 * sizeof(float))); //2 output channels for (SampleBlock = TSF_RENDER_EFFECTSAMPLEBLOCK; SampleCount; SampleCount -= SampleBlock, stream += (SampleBlock * (2 * sizeof(float)))) { //We progress the MIDI playback and then process TSF_RENDER_EFFECTSAMPLEBLOCK samples at once if (SampleBlock > SampleCount) SampleBlock = SampleCount; //Loop through all MIDI messages which need to be played up until the current playback time for (g_Msec += SampleBlock * (1000.0 / 44100.0); g_MidiMessage && g_Msec >= g_MidiMessage->time; g_MidiMessage = g_MidiMessage->next) { int Preset; switch (g_MidiMessage->type) { case TML_PROGRAM_CHANGE: //channel program (preset) change if (g_MidiMessage->channel == 9) { //10th MIDI channel uses percussion sound bank (128) Preset = tsf_get_presetindex(g_TinySoundFont, 128, g_MidiMessage->program); if (Preset < 0) Preset = tsf_get_presetindex(g_TinySoundFont, 128, 0); if (Preset < 0) Preset = tsf_get_presetindex(g_TinySoundFont, 0, g_MidiMessage->program); } else Preset = tsf_get_presetindex(g_TinySoundFont, 0, g_MidiMessage->program); tsf_channel_set_preset(g_TinySoundFont, g_MidiMessage->channel, (Preset < 0 ? 0 : Preset)); break; case TML_NOTE_ON: //play a note tsf_channel_note_on(g_TinySoundFont, g_MidiMessage->channel, g_MidiMessage->key, g_MidiMessage->velocity / 127.0f); break; case TML_NOTE_OFF: //stop a note tsf_channel_note_off(g_TinySoundFont, g_MidiMessage->channel, g_MidiMessage->key); break; case TML_PITCH_BEND: //pitch wheel modification tsf_channel_set_pitchwheel(g_TinySoundFont, g_MidiMessage->channel, g_MidiMessage->pitch_bend); break; case TML_CONTROL_CHANGE: //MIDI controller messages switch (g_MidiMessage->control) { #define FLOAT_APPLY_MSB(val, msb) (((((int)(val*16383.5f)) & 0x7f) | (msb << 7)) / 16383.0f) #define FLOAT_APPLY_LSB(val, lsb) (((((int)(val*16383.5f)) & ~0x7f) | lsb ) / 16383.0f) case TML_VOLUME_MSB: case TML_EXPRESSION_MSB: tsf_channel_set_volume(g_TinySoundFont, g_MidiMessage->channel, FLOAT_APPLY_MSB(tsf_channel_get_volume(g_TinySoundFont, g_MidiMessage->channel), g_MidiMessage->control_value)); break; case TML_VOLUME_LSB: case TML_EXPRESSION_LSB: tsf_channel_set_volume(g_TinySoundFont, g_MidiMessage->channel, FLOAT_APPLY_LSB(tsf_channel_get_volume(g_TinySoundFont, g_MidiMessage->channel), g_MidiMessage->control_value)); break; case TML_BALANCE_MSB: case TML_PAN_MSB: tsf_channel_set_pan(g_TinySoundFont, g_MidiMessage->channel, FLOAT_APPLY_MSB(tsf_channel_get_pan(g_TinySoundFont, g_MidiMessage->channel), g_MidiMessage->control_value)); break; case TML_BALANCE_LSB: case TML_PAN_LSB: tsf_channel_set_pan(g_TinySoundFont, g_MidiMessage->channel, FLOAT_APPLY_LSB(tsf_channel_get_pan(g_TinySoundFont, g_MidiMessage->channel), g_MidiMessage->control_value)); break; case TML_ALL_SOUND_OFF: tsf_channel_sounds_off_all(g_TinySoundFont, g_MidiMessage->channel); break; case TML_ALL_CTRL_OFF: tsf_channel_set_volume(g_TinySoundFont, g_MidiMessage->channel, 1.0f); tsf_channel_set_pan(g_TinySoundFont, g_MidiMessage->channel, 0.5f); break; case TML_ALL_NOTES_OFF: tsf_channel_note_off_all(g_TinySoundFont, g_MidiMessage->channel); break; } break; } } // Render the block of audio samples in float format tsf_render_float(g_TinySoundFont, (float*)stream, SampleBlock, 0); } } int main(int argc, char *argv[]) { tml_message* TinyMidiLoader = NULL; // 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; } //Venture (Original WIP) by Ximon //https://musescore.com/user/2391686/scores/841451 //License: Creative Commons copyright waiver (CC0) TinyMidiLoader = tml_load_filename("venture.mid"); if (!TinyMidiLoader) { fprintf(stderr, "Could not load MIDI file\n"); return 1; } //Set up the global MidiMessage pointer to the first MIDI message g_MidiMessage = TinyMidiLoader; // Load the SoundFont from a file g_TinySoundFont = tsf_load_filename("florestan-subset.sf2"); if (!g_TinySoundFont) { fprintf(stderr, "Could not load SoundFont\n"); return 1; } //Initialize preset on special 10th MIDI channel to use percussion sound bank (128) if available tsf_channel_set_bank_preset(g_TinySoundFont, 9, 128, 0); // Set the SoundFont rendering output mode with -18 db volume gain tsf_set_output(g_TinySoundFont, TSF_STEREO_INTERLEAVED, OutputAudioSpec.freq, -18.0f); // 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); //Wait until the entire MIDI file has been played back (until the end of the linked message list is reached) while (g_MidiMessage != NULL) SDL_Delay(100); // We could call tsf_close(g_TinySoundFont) and tml_free(TinyMidiLoader) // here to free the memory and resources but we just let the OS clean up // because the process ends here. return 0; }