🛠️🐜 Antkeeper superbuild with dependencies included
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306 lines
9.6 KiB
306 lines
9.6 KiB
/*
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* OpenAL Tone Generator Test
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*
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* Copyright (c) 2015 by Chris Robinson <chris.kcat@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/* This file contains a test for generating waveforms and plays them for a
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* given length of time. Intended to inspect the behavior of the mixer by
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* checking the output with a spectrum analyzer and oscilloscope.
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*
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* TODO: This would actually be nicer as a GUI app with buttons to start and
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* stop individual waveforms, include additional whitenoise and pinknoise
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* generators, and have the ability to hook up EFX filters and effects.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <limits.h>
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#include <math.h>
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#include "AL/al.h"
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#include "AL/alc.h"
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#include "AL/alext.h"
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#include "common/alhelpers.h"
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#ifndef M_PI
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#define M_PI (3.14159265358979323846)
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#endif
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enum WaveType {
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WT_Sine,
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WT_Square,
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WT_Sawtooth,
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WT_Triangle,
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WT_Impulse,
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WT_WhiteNoise,
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};
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static const char *GetWaveTypeName(enum WaveType type)
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{
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switch(type)
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{
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case WT_Sine: return "sine";
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case WT_Square: return "square";
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case WT_Sawtooth: return "sawtooth";
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case WT_Triangle: return "triangle";
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case WT_Impulse: return "impulse";
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case WT_WhiteNoise: return "noise";
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}
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return "(unknown)";
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}
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static inline ALuint dither_rng(ALuint *seed)
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{
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*seed = (*seed * 96314165) + 907633515;
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return *seed;
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}
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static void ApplySin(ALfloat *data, ALdouble g, ALuint srate, ALuint freq)
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{
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ALdouble smps_per_cycle = (ALdouble)srate / freq;
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ALuint i;
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for(i = 0;i < srate;i++)
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data[i] += (ALfloat)(sin(i/smps_per_cycle * 2.0*M_PI) * g);
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}
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/* Generates waveforms using additive synthesis. Each waveform is constructed
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* by summing one or more sine waves, up to (and excluding) nyquist.
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*/
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static ALuint CreateWave(enum WaveType type, ALuint freq, ALuint srate)
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{
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ALuint seed = 22222;
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ALint data_size;
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ALfloat *data;
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ALuint buffer;
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ALenum err;
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ALuint i;
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data_size = srate * sizeof(ALfloat);
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data = calloc(1, data_size);
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switch(type)
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{
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case WT_Sine:
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ApplySin(data, 1.0, srate, freq);
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break;
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case WT_Square:
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for(i = 1;freq*i < srate/2;i+=2)
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ApplySin(data, 4.0/M_PI * 1.0/i, srate, freq*i);
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break;
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case WT_Sawtooth:
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for(i = 1;freq*i < srate/2;i++)
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ApplySin(data, 2.0/M_PI * ((i&1)*2 - 1.0) / i, srate, freq*i);
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break;
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case WT_Triangle:
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for(i = 1;freq*i < srate/2;i+=2)
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ApplySin(data, 8.0/(M_PI*M_PI) * (1.0 - (i&2)) / (i*i), srate, freq*i);
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break;
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case WT_Impulse:
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/* NOTE: Impulse isn't handled using additive synthesis, and is
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* instead just a non-0 sample at a given rate. This can still be
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* useful to test (other than resampling, the ALSOFT_DEFAULT_REVERB
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* environment variable can prove useful here to test the reverb
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* response).
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*/
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for(i = 0;i < srate;i++)
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data[i] = (i%(srate/freq)) ? 0.0f : 1.0f;
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break;
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case WT_WhiteNoise:
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/* NOTE: WhiteNoise is just uniform set of uncorrelated values, and
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* is not influenced by the waveform frequency.
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*/
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for(i = 0;i < srate;i++)
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{
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ALuint rng0 = dither_rng(&seed);
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ALuint rng1 = dither_rng(&seed);
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data[i] = (ALfloat)(rng0*(1.0/UINT_MAX) - rng1*(1.0/UINT_MAX));
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}
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break;
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}
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/* Buffer the audio data into a new buffer object. */
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buffer = 0;
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alGenBuffers(1, &buffer);
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alBufferData(buffer, AL_FORMAT_MONO_FLOAT32, data, data_size, srate);
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free(data);
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/* Check if an error occured, and clean up if so. */
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err = alGetError();
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if(err != AL_NO_ERROR)
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{
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fprintf(stderr, "OpenAL Error: %s\n", alGetString(err));
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if(alIsBuffer(buffer))
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alDeleteBuffers(1, &buffer);
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return 0;
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}
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return buffer;
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}
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int main(int argc, char *argv[])
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{
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enum WaveType wavetype = WT_Sine;
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const char *appname = argv[0];
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ALuint source, buffer;
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ALint last_pos, num_loops;
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ALint max_loops = 4;
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ALint srate = -1;
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ALint tone_freq = 1000;
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ALCint dev_rate;
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ALenum state;
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int i;
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argv++; argc--;
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if(InitAL(&argv, &argc) != 0)
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return 1;
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if(!alIsExtensionPresent("AL_EXT_FLOAT32"))
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{
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fprintf(stderr, "Required AL_EXT_FLOAT32 extension not supported on this device!\n");
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CloseAL();
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return 1;
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}
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for(i = 0;i < argc;i++)
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{
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if(strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0)
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{
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fprintf(stderr, "OpenAL Tone Generator\n"
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"\n"
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"Usage: %s [-device <name>] <options>\n"
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"\n"
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"Available options:\n"
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" --help/-h This help text\n"
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" -t <seconds> Time to play a tone (default 5 seconds)\n"
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" --waveform/-w <type> Waveform type: sine (default), square, sawtooth,\n"
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" triangle, impulse, noise\n"
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" --freq/-f <hz> Tone frequency (default 1000 hz)\n"
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" --srate/-s <sample rate> Sampling rate (default output rate)\n",
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appname
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);
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CloseAL();
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return 1;
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}
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else if(i+1 < argc && strcmp(argv[i], "-t") == 0)
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{
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i++;
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max_loops = atoi(argv[i]) - 1;
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}
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else if(i+1 < argc && (strcmp(argv[i], "--waveform") == 0 || strcmp(argv[i], "-w") == 0))
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{
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i++;
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if(strcmp(argv[i], "sine") == 0)
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wavetype = WT_Sine;
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else if(strcmp(argv[i], "square") == 0)
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wavetype = WT_Square;
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else if(strcmp(argv[i], "sawtooth") == 0)
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wavetype = WT_Sawtooth;
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else if(strcmp(argv[i], "triangle") == 0)
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wavetype = WT_Triangle;
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else if(strcmp(argv[i], "impulse") == 0)
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wavetype = WT_Impulse;
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else if(strcmp(argv[i], "noise") == 0)
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wavetype = WT_WhiteNoise;
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else
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fprintf(stderr, "Unhandled waveform: %s\n", argv[i]);
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}
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else if(i+1 < argc && (strcmp(argv[i], "--freq") == 0 || strcmp(argv[i], "-f") == 0))
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{
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i++;
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tone_freq = atoi(argv[i]);
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if(tone_freq < 1)
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{
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fprintf(stderr, "Invalid tone frequency: %s (min: 1hz)\n", argv[i]);
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tone_freq = 1;
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}
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}
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else if(i+1 < argc && (strcmp(argv[i], "--srate") == 0 || strcmp(argv[i], "-s") == 0))
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{
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i++;
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srate = atoi(argv[i]);
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if(srate < 40)
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{
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fprintf(stderr, "Invalid sample rate: %s (min: 40hz)\n", argv[i]);
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srate = 40;
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}
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}
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}
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{
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ALCdevice *device = alcGetContextsDevice(alcGetCurrentContext());
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alcGetIntegerv(device, ALC_FREQUENCY, 1, &dev_rate);
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assert(alcGetError(device)==ALC_NO_ERROR && "Failed to get device sample rate");
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}
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if(srate < 0)
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srate = dev_rate;
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/* Load the sound into a buffer. */
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buffer = CreateWave(wavetype, tone_freq, srate);
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if(!buffer)
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{
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CloseAL();
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return 1;
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}
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printf("Playing %dhz %s-wave tone with %dhz sample rate and %dhz output, for %d second%s...\n",
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tone_freq, GetWaveTypeName(wavetype), srate, dev_rate, max_loops+1, max_loops?"s":"");
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fflush(stdout);
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/* Create the source to play the sound with. */
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source = 0;
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alGenSources(1, &source);
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alSourcei(source, AL_BUFFER, buffer);
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assert(alGetError()==AL_NO_ERROR && "Failed to setup sound source");
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/* Play the sound for a while. */
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num_loops = 0;
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last_pos = 0;
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alSourcei(source, AL_LOOPING, (max_loops > 0) ? AL_TRUE : AL_FALSE);
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alSourcePlay(source);
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do {
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ALint pos;
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al_nssleep(10000000);
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alGetSourcei(source, AL_SAMPLE_OFFSET, &pos);
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alGetSourcei(source, AL_SOURCE_STATE, &state);
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if(pos < last_pos && state == AL_PLAYING)
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{
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++num_loops;
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if(num_loops >= max_loops)
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alSourcei(source, AL_LOOPING, AL_FALSE);
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printf("%d...\n", max_loops - num_loops + 1);
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fflush(stdout);
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}
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last_pos = pos;
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} while(alGetError() == AL_NO_ERROR && state == AL_PLAYING);
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/* All done. Delete resources, and close OpenAL. */
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alDeleteSources(1, &source);
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alDeleteBuffers(1, &buffer);
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/* Close up OpenAL. */
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CloseAL();
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return 0;
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}
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