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externals/openal-soft/examples/alhrtf.c

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+/*
+ * OpenAL HRTF Example
+ *
+ * Copyright (c) 2015 by Chris Robinson <chris.kcat@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/* This file contains an example for selecting an HRTF. */
+
+#include <assert.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sndfile.h"
+
+#include "AL/al.h"
+#include "AL/alc.h"
+#include "AL/alext.h"
+
+#include "common/alhelpers.h"
+
+
+#ifndef M_PI
+#define M_PI                         (3.14159265358979323846)
+#endif
+
+static LPALCGETSTRINGISOFT alcGetStringiSOFT;
+static LPALCRESETDEVICESOFT alcResetDeviceSOFT;
+
+/* LoadBuffer loads the named audio file into an OpenAL buffer object, and
+ * returns the new buffer ID.
+ */
+static ALuint LoadSound(const char *filename)
+{
+    ALenum err, format;
+    ALuint buffer;
+    SNDFILE *sndfile;
+    SF_INFO sfinfo;
+    short *membuf;
+    sf_count_t num_frames;
+    ALsizei num_bytes;
+
+    /* Open the audio file and check that it's usable. */
+    sndfile = sf_open(filename, SFM_READ, &sfinfo);
+    if(!sndfile)
+    {
+        fprintf(stderr, "Could not open audio in %s: %s\n", filename, sf_strerror(sndfile));
+        return 0;
+    }
+    if(sfinfo.frames < 1 || sfinfo.frames > (sf_count_t)(INT_MAX/sizeof(short))/sfinfo.channels)
+    {
+        fprintf(stderr, "Bad sample count in %s (%" PRId64 ")\n", filename, sfinfo.frames);
+        sf_close(sndfile);
+        return 0;
+    }
+
+    /* Get the sound format, and figure out the OpenAL format */
+    format = AL_NONE;
+    if(sfinfo.channels == 1)
+        format = AL_FORMAT_MONO16;
+    else if(sfinfo.channels == 2)
+        format = AL_FORMAT_STEREO16;
+    else if(sfinfo.channels == 3)
+    {
+        if(sf_command(sndfile, SFC_WAVEX_GET_AMBISONIC, NULL, 0) == SF_AMBISONIC_B_FORMAT)
+            format = AL_FORMAT_BFORMAT2D_16;
+    }
+    else if(sfinfo.channels == 4)
+    {
+        if(sf_command(sndfile, SFC_WAVEX_GET_AMBISONIC, NULL, 0) == SF_AMBISONIC_B_FORMAT)
+            format = AL_FORMAT_BFORMAT3D_16;
+    }
+    if(!format)
+    {
+        fprintf(stderr, "Unsupported channel count: %d\n", sfinfo.channels);
+        sf_close(sndfile);
+        return 0;
+    }
+
+    /* Decode the whole audio file to a buffer. */
+    membuf = malloc((size_t)(sfinfo.frames * sfinfo.channels) * sizeof(short));
+
+    num_frames = sf_readf_short(sndfile, membuf, sfinfo.frames);
+    if(num_frames < 1)
+    {
+        free(membuf);
+        sf_close(sndfile);
+        fprintf(stderr, "Failed to read samples in %s (%" PRId64 ")\n", filename, num_frames);
+        return 0;
+    }
+    num_bytes = (ALsizei)(num_frames * sfinfo.channels) * (ALsizei)sizeof(short);
+
+    /* Buffer the audio data into a new buffer object, then free the data and
+     * close the file.
+     */
+    buffer = 0;
+    alGenBuffers(1, &buffer);
+    alBufferData(buffer, format, membuf, num_bytes, sfinfo.samplerate);
+
+    free(membuf);
+    sf_close(sndfile);
+
+    /* Check if an error occured, and clean up if so. */
+    err = alGetError();
+    if(err != AL_NO_ERROR)
+    {
+        fprintf(stderr, "OpenAL Error: %s\n", alGetString(err));
+        if(buffer && alIsBuffer(buffer))
+            alDeleteBuffers(1, &buffer);
+        return 0;
+    }
+
+    return buffer;
+}
+
+
+int main(int argc, char **argv)
+{
+    ALCdevice *device;
+    ALCcontext *context;
+    ALboolean has_angle_ext;
+    ALuint source, buffer;
+    const char *soundname;
+    const char *hrtfname;
+    ALCint hrtf_state;
+    ALCint num_hrtf;
+    ALdouble angle;
+    ALenum state;
+
+    /* Print out usage if no arguments were specified */
+    if(argc < 2)
+    {
+        fprintf(stderr, "Usage: %s [-device <name>] [-hrtf <name>] <soundfile>\n", argv[0]);
+        return 1;
+    }
+
+    /* Initialize OpenAL, and check for HRTF support. */
+    argv++; argc--;
+    if(InitAL(&argv, &argc) != 0)
+        return 1;
+
+    context = alcGetCurrentContext();
+    device = alcGetContextsDevice(context);
+    if(!alcIsExtensionPresent(device, "ALC_SOFT_HRTF"))
+    {
+        fprintf(stderr, "Error: ALC_SOFT_HRTF not supported\n");
+        CloseAL();
+        return 1;
+    }
+
+    /* Define a macro to help load the function pointers. */
+#define LOAD_PROC(d, T, x)  ((x) = FUNCTION_CAST(T, alcGetProcAddress((d), #x)))
+    LOAD_PROC(device, LPALCGETSTRINGISOFT, alcGetStringiSOFT);
+    LOAD_PROC(device, LPALCRESETDEVICESOFT, alcResetDeviceSOFT);
+#undef LOAD_PROC
+
+    /* Check for the AL_EXT_STEREO_ANGLES extension to be able to also rotate
+     * stereo sources.
+     */
+    has_angle_ext = alIsExtensionPresent("AL_EXT_STEREO_ANGLES");
+    printf("AL_EXT_STEREO_ANGLES %sfound\n", has_angle_ext?"":"not ");
+
+    /* Check for user-preferred HRTF */
+    if(strcmp(argv[0], "-hrtf") == 0)
+    {
+        hrtfname = argv[1];
+        soundname = argv[2];
+    }
+    else
+    {
+        hrtfname = NULL;
+        soundname = argv[0];
+    }
+
+    /* Enumerate available HRTFs, and reset the device using one. */
+    alcGetIntegerv(device, ALC_NUM_HRTF_SPECIFIERS_SOFT, 1, &num_hrtf);
+    if(!num_hrtf)
+        printf("No HRTFs found\n");
+    else
+    {
+        ALCint attr[5];
+        ALCint index = -1;
+        ALCint i;
+
+        printf("Available HRTFs:\n");
+        for(i = 0;i < num_hrtf;i++)
+        {
+            const ALCchar *name = alcGetStringiSOFT(device, ALC_HRTF_SPECIFIER_SOFT, i);
+            printf("    %d: %s\n", i, name);
+
+            /* Check if this is the HRTF the user requested. */
+            if(hrtfname && strcmp(name, hrtfname) == 0)
+                index = i;
+        }
+
+        i = 0;
+        attr[i++] = ALC_HRTF_SOFT;
+        attr[i++] = ALC_TRUE;
+        if(index == -1)
+        {
+            if(hrtfname)
+                printf("HRTF \"%s\" not found\n", hrtfname);
+            printf("Using default HRTF...\n");
+        }
+        else
+        {
+            printf("Selecting HRTF %d...\n", index);
+            attr[i++] = ALC_HRTF_ID_SOFT;
+            attr[i++] = index;
+        }
+        attr[i] = 0;
+
+        if(!alcResetDeviceSOFT(device, attr))
+            printf("Failed to reset device: %s\n", alcGetString(device, alcGetError(device)));
+    }
+
+    /* Check if HRTF is enabled, and show which is being used. */
+    alcGetIntegerv(device, ALC_HRTF_SOFT, 1, &hrtf_state);
+    if(!hrtf_state)
+        printf("HRTF not enabled!\n");
+    else
+    {
+        const ALchar *name = alcGetString(device, ALC_HRTF_SPECIFIER_SOFT);
+        printf("HRTF enabled, using %s\n", name);
+    }
+    fflush(stdout);
+
+    /* Load the sound into a buffer. */
+    buffer = LoadSound(soundname);
+    if(!buffer)
+    {
+        CloseAL();
+        return 1;
+    }
+
+    /* Create the source to play the sound with. */
+    source = 0;
+    alGenSources(1, &source);
+    alSourcei(source, AL_SOURCE_RELATIVE, AL_TRUE);
+    alSource3f(source, AL_POSITION, 0.0f, 0.0f, -1.0f);
+    alSourcei(source, AL_BUFFER, (ALint)buffer);
+    assert(alGetError()==AL_NO_ERROR && "Failed to setup sound source");
+
+    /* Play the sound until it finishes. */
+    angle = 0.0;
+    alSourcePlay(source);
+    do {
+        al_nssleep(10000000);
+
+        alcSuspendContext(context);
+
+        /* Rotate the source around the listener by about 1/4 cycle per second,
+         * and keep it within -pi...+pi.
+         */
+        angle += 0.01 * M_PI * 0.5;
+        if(angle > M_PI)
+            angle -= M_PI*2.0;
+
+        /* This only rotates mono sounds. */
+        alSource3f(source, AL_POSITION, (ALfloat)sin(angle), 0.0f, -(ALfloat)cos(angle));
+
+        if(has_angle_ext)
+        {
+            /* This rotates stereo sounds with the AL_EXT_STEREO_ANGLES
+             * extension. Angles are specified counter-clockwise in radians.
+             */
+            ALfloat angles[2] = { (ALfloat)(M_PI/6.0 - angle), (ALfloat)(-M_PI/6.0 - angle) };
+            alSourcefv(source, AL_STEREO_ANGLES, angles);
+        }
+        alcProcessContext(context);
+
+        alGetSourcei(source, AL_SOURCE_STATE, &state);
+    } while(alGetError() == AL_NO_ERROR && state == AL_PLAYING);
+
+    /* All done. Delete resources, and close down OpenAL. */
+    alDeleteSources(1, &source);
+    alDeleteBuffers(1, &buffer);
+    CloseAL();
+
+    return 0;
+}