diff options
Diffstat (limited to 'examples/altonegen.c')
| -rw-r--r-- | examples/altonegen.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/examples/altonegen.c b/examples/altonegen.c index 1e93c904..65980529 100644 --- a/examples/altonegen.c +++ b/examples/altonegen.c @@ -52,6 +52,7 @@ enum WaveType { WT_Square, WT_Sawtooth, WT_Triangle, + WT_Impulse, }; static const char *GetWaveTypeName(enum WaveType type) @@ -62,6 +63,7 @@ static const char *GetWaveTypeName(enum WaveType type) case WT_Square: return "square"; case WT_Sawtooth: return "sawtooth"; case WT_Triangle: return "triangle"; + case WT_Impulse: return "impulse"; } return "(unknown)"; } @@ -98,6 +100,15 @@ static ALuint CreateWave(enum WaveType type, ALuint freq, ALuint srate) else if(type == WT_Triangle) for(i = 1;freq*i < srate/2;i+=2) ApplySin(data, 8.0/(M_PI*M_PI) * (1.0 - (i&2)) / (i*i), srate, freq*i); + else if(type == WT_Impulse) + { + /* NOTE: Impulse isn't really a waveform, but it can still be useful to + * test (other than resampling, the ALSOFT_DEFAULT_REVERB environment + * variable can prove useful here to test the reverb response). + */ + for(i = 0;i < srate;i++) + data[i] = (i%(srate/freq)) ? 0.0f : 1.0f; + } /* Buffer the audio data into a new buffer object. */ buffer = 0; @@ -143,7 +154,7 @@ int main(int argc, char *argv[]) " --help/-h This help text\n" " -t <seconds> Time to play a tone (default 5 seconds)\n" " --waveform/-w <type> Waveform type: sine (default), square, sawtooth,\n" -" triangle\n" +" triangle, impulse\n" " --freq/-f <hz> Tone frequency (default 1000 hz)\n" " --srate/-s <sample rate> Sampling rate (default output rate)\n", argv[0] @@ -166,6 +177,8 @@ int main(int argc, char *argv[]) wavetype = WT_Sawtooth; else if(strcmp(argv[i], "triangle") == 0) wavetype = WT_Triangle; + else if(strcmp(argv[i], "impulse") == 0) + wavetype = WT_Impulse; else fprintf(stderr, "Unhandled waveform: %s\n", argv[i]); } @@ -173,10 +186,10 @@ int main(int argc, char *argv[]) { i++; tone_freq = atoi(argv[i]); - if(tone_freq < 20) + if(tone_freq < 1) { - fprintf(stderr, "Invalid tone frequency: %s (min: 20hz)\n", argv[i]); - tone_freq = 20; + fprintf(stderr, "Invalid tone frequency: %s (min: 1hz)\n", argv[i]); + tone_freq = 1; } } else if(i+1 < argc && (strcmp(argv[i], "--srate") == 0 || strcmp(argv[i], "-s") == 0)) |