c/sampler/sdl.c

   1 /* Ghetto Sound - Sampler
   2  * by: Harvie 2o1o
   3  *
   4  * TODO:
   5  * - port unbuffered getchar to windows
   6  */
   7
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12 #include <termio.h>
  13 #include "SDL.h"
  14 #include "SDL_mixer.h"
  15 //Docs: http://www.libsdl.org/projects/SDL_mixer/docs/
  16 //example http://www.kekkai.org/roger/sdl/mixer/
  17
  18 static struct termios stored_settings;
  19 void tc_reset() { tcsetattr(0,TCSANOW,&stored_settings); }
  20 void icanon_off() {
  21         struct termios new_settings;
  22         tcgetattr(0,&stored_settings);
  23         new_settings = stored_settings;
  24         new_settings.c_lflag &= (~ICANON);
  25         new_settings.c_lflag &= (~ECHO);
  26         new_settings.c_cc[VTIME] = 0;
  27         new_settings.c_cc[VMIN] = 1;
  28         tcsetattr(0,TCSANOW,&new_settings);
  29         atexit(tc_reset);
  30 }
  31
  32 /*char gethit() {
  33         icanon_off();
  34         char c = getchar();
  35         tc_reset();
  36         return c;
  37 }*/
  38
  39 Mix_Chunk **sample = NULL;
  40 int samplec = 0;
  41
  42 void cleanUp() {
  43         int i;
  44         for(i=0;i<samplec;i++) { Mix_FreeChunk(sample[i]); }
  45         Mix_CloseAudio();
  46         SDL_Quit();
  47 }
  48
  49 char *keymap = "xcvbnmasdfghjklwertuiop789456123zy";
  50 int i;
  51 int main(int argc, char* argv[]) {
  52         if(argc == 1) {
  53                 printf("\n\tUsage:\t%s *.wav *.ogg [...]\n", argv[0]);
  54                 printf("\t\t%s --keys 7894561230 *.wav *.ogg [...] #to use own key-bindings\n", argv[0]);
  55                 puts("\t\t- lowercase: play sample once; uppercase: loop sample;");
  56                 puts("");
  57                 puts("\t- currently supported formats: WAVE, AIFF, RIFF, OGG(libvorbis), VOC, MOD(libmikmod), MIDI, MP3(smpeg)");
  58                 puts("\t- currently there are issues with mp3s - you should convert it:");
  59                         puts("\t\t- mp3 to wav: ffmpeg -i in.mp3 out.wav");
  60                         puts("\t\t- mp3 to ogg: ffmpeg -i in.mp3 -acodec vorbis -ac 2 -aq 60 out.ogg");
  61                 puts("");
  62                 exit(-1);
  63         }
  64
  65         //Init SDL:
  66         if(SDL_Init(SDL_INIT_AUDIO)) {
  67                 perror("Cannot initialize SDL using SDL_Init!\n");
  68                 exit(1);
  69         }
  70         atexit(cleanUp);
  71         //Open audio
  72         if(Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 256)) { //sampl.freq(def22050), format, 2stereo/1mono, chunksize(default 4095)
  73                 perror("Cannot open audio using Mix_OpenAudio!\n");
  74                 exit(2);
  75         }
  76         //alloc enough mixer channels
  77         Mix_AllocateChannels(argc*2);
  78         //set volume
  79         Mix_Volume(-1,MIX_MAX_VOLUME/2);
  80
  81         //alloc enough samples
  82         sample = malloc(sizeof(Mix_Chunk)*argc);
  83         samplec = 0;
  84
  85
  86         i = 1;
  87         argv++; argc--; //get rid of argv[0]
  88         while(argc) { //loop through args (load samples and parse options)
  89                 if(!strcmp(argv[0], "--keys")) { //alternative keymap
  90                         if(samplec > 0) {
  91                                 puts("\nERR: Cannot specify keys after loading first sample!");
  92                                 break;
  93                         }
  94                         if(--argc) { argv++; }
  95                                 else { break; }
  96                         keymap = argv[0];
  97                         argv++; argc--; continue;
  98                 }
  99                 if(samplec < strlen(keymap)) {
 100                         sample[samplec] = Mix_LoadWAV(argv[0]);
 101                         if(sample[samplec]) {
 102                                 printf("[%c]: %s%c", keymap[samplec], argv[0], (samplec+1)%4==0?'\n':'\t');
 103                                 samplec++;
 104                         } else {
 105                                 printf("\nERR: Mix_LoadWAV(%s): %s\n", argv[0], Mix_GetError());
 106                         }
 107                 } else {
 108                         if(i) puts("\nERR: Not enough keys on keyboard (or in keymap)!");
 109                         i = 0;
 110                 }
 111
 112                 argv++; argc--;
 113         }
 114         puts("");
 115
 116         //Main loop:
 117         puts("[Q]: exit!\t[SPACE]: silence!\t[ENTER]: delay\t[-]: halucination");
 118         int keymaplen = strlen(keymap);
 119         //freopen("test.seq", "r", stdin);
 120
 121         icanon_off();
 122         char c; while(c = getchar()) {
 123                 //lowercase: play sample once
 124                 for(i=0;i<keymaplen && i < samplec;i++) if(c == keymap[i]) {
 125                         if(Mix_PlayChannel(samplec+i, sample[i], 0) == -1) printf("ERR: Mix_PlayChannel(sample #%d): %s\n", i, Mix_GetError());
 126                 }
 127                 //uppercase: start/stop loop
 128                 for(i=0;i<keymaplen && i < samplec;i++) if(c == keymap[i]-'a'+'A') {
 129                         if(Mix_Playing(i)) {
 130                                 Mix_HaltChannel(i);
 131                         } else {
 132                                 if(Mix_PlayChannel(i, sample[i], -1) == -1) printf("ERR: Mix_PlayChannel(sample #%d, loop): %s\n", i, Mix_GetError());
 133                         }
 134                 }
 135                 if(c == ' ') Mix_HaltChannel(-1);
 136                 if(c == '\n') sleep(1);
 137                 if(c == '#') while(getchar() != '\n');
 138                 if(c == '?') while(Mix_Playing(-1)) usleep(1000);
 139                 if(c == '}') rewind(stdin);
 140                 if(c == 'Q' || c == 'q') break;
 141                 if(c == '-') for(i=360;i>=0;i--) { //halucination
 142                         Mix_SetPosition(MIX_CHANNEL_POST, i, 0);
 143                         usleep(2000);
 144                 }
 145         }
 146
 147         exit(0);
 148 }
 149