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Add a gain argument to altonegen #502

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merged 2 commits into from
Dec 4, 2020
+25 −5
Merged

Add a gain argument to altonegen #502

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e593df9
Fix a speeling rorre in an error message.
eliotmiranda Dec 4, 2020
d8ae2bb
Fix some formatting issues and a copy/paste error.
eliotmiranda Dec 4, 2020
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2 changes: 1 addition & 1 deletion alc/backends/opensl.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -252,7 +252,7 @@ int OpenSLPlayback::mixerProc()
}
if(SL_RESULT_SUCCESS != result)
{
mDevice->handleDisconnect("Failed to start platback: 0x%08x", result);
mDevice->handleDisconnect("Failed to start playback: 0x%08x", result);
break;
}

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28 changes: 24 additions & 4 deletions examples/altonegen.c
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Expand Up @@ -44,7 +44,9 @@

#include "common/alhelpers.h"

#include "win_main_utf8.h"
#ifdef _WIN32
# include "win_main_utf8.h"
#endif
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Is there a reason this was put behind an ifdef, when the header already checks for Windows?

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I made a mistake compiling the examples, leaving out an include directory path. But for me I prefer having the logic that include or excludes platform specific files where I can see it rather than going to the header to check. So my steps went something like, “compilation on Mac failed, why? Saw the Windows specific include, ifdef’ed it out, compilation succeeded. Link failed with code in alhelpers.c missing. Found alhelpers, added the directory, compiled and linked altonegen. Didn’t go back to undo ifdefs cuz the code feels more readable that way.

I shall revert if if you prefer.


#ifndef M_PI
#define M_PI (3.14159265358979323846)
Expand Down Expand Up @@ -93,7 +95,7 @@ static void ApplySin(ALfloat *data, ALdouble g, ALuint srate, ALuint freq)
/* Generates waveforms using additive synthesis. Each waveform is constructed
* by summing one or more sine waves, up to (and excluding) nyquist.
*/
static ALuint CreateWave(enum WaveType type, ALuint freq, ALuint srate)
static ALuint CreateWave(enum WaveType type, ALuint freq, ALuint srate, ALfloat gain)
{
ALuint seed = 22222;
ALuint data_size;
Expand Down Expand Up @@ -144,6 +146,10 @@ static ALuint CreateWave(enum WaveType type, ALuint freq, ALuint srate)
break;
}

if (gain != 1.0)
for(i = 0;i < srate;i++)
data[i] *= gain;

/* Buffer the audio data into a new buffer object. */
buffer = 0;
alGenBuffers(1, &buffer);
Expand Down Expand Up @@ -175,6 +181,7 @@ int main(int argc, char *argv[])
ALint tone_freq = 1000;
ALCint dev_rate;
ALenum state;
ALfloat gain = 1.0f;
int i;

argv++; argc--;
Expand All @@ -190,7 +197,9 @@ int main(int argc, char *argv[])

for(i = 0;i < argc;i++)
{
if(strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0)
if (strcmp(argv[i], "-h") == 0
|| strcmp(argv[i], "-?") == 0
|| strcmp(argv[i], "--help") == 0)
{
fprintf(stderr, "OpenAL Tone Generator\n"
"\n"
Expand All @@ -202,6 +211,7 @@ int main(int argc, char *argv[])
" --waveform/-w <type> Waveform type: sine (default), square, sawtooth,\n"
" triangle, impulse, noise\n"
" --freq/-f <hz> Tone frequency (default 1000 hz)\n"
" --gain/-g <gain> gain 0.0 to 1 (default 1)\n"
" --srate/-s <sample rate> Sampling rate (default output rate)\n",
appname
);
Expand Down Expand Up @@ -241,6 +251,16 @@ int main(int argc, char *argv[])
tone_freq = 1;
}
}
else if(i+1 < argc && (strcmp(argv[i], "--gain") == 0 || strcmp(argv[i], "-g") == 0))
{
i++;
gain = atof(argv[i]);
if (gain < 0.0f || gain > 1.0f)
{
fprintf(stderr, "Invalid gain: %s (min: 0.0, max 1.0)\n", argv[i]);
gain = 1.0f;
}
}
else if(i+1 < argc && (strcmp(argv[i], "--srate") == 0 || strcmp(argv[i], "-s") == 0))
{
i++;
Expand All @@ -262,7 +282,7 @@ int main(int argc, char *argv[])
srate = dev_rate;

/* Load the sound into a buffer. */
buffer = CreateWave(wavetype, (ALuint)tone_freq, (ALuint)srate);
buffer = CreateWave(wavetype, (ALuint)tone_freq, (ALuint)srate, gain);
if(!buffer)
{
CloseAL();
Expand Down