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authorChris Robinson <[email protected]>2015-10-31 05:15:13 -0700
committerChris Robinson <[email protected]>2015-10-31 05:15:13 -0700
commit4a9dd6576f9fb61a4b61bd862950158e2b9316ac (patch)
treef064651e1a8429eef7c0255e1134fea816abafdb
parent0644ebbaa2c3cbbe08c3aaaa41abe79fcfb6f2d4 (diff)
Add an impulse "waveform" to altonegen
-rw-r--r--examples/altonegen.c21
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))