samples: Add openal

samples/openal/Makefile

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+XBE_TITLE = openal
+GEN_XISO = $(XBE_TITLE).iso
+SRCS += $(wildcard $(CURDIR)/*.c)
+NXDK_DIR = $(CURDIR)/../..
+NXDK_SDL = y
+include $(NXDK_DIR)/Makefile

samples/openal/alhelpers.c

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+/*
+ * OpenAL Helpers
+ *
+ * Copyright (c) 2011 by Chris Robinson <[email protected]>
+ *
+ * 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 routines to help with some menial OpenAL-related tasks,
+ * such as opening a device and setting up a context, closing the device and
+ * destroying its context, converting between frame counts and byte lengths,
+ * finding an appropriate buffer format, and getting readable strings for
+ * channel configs and sample types. */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "AL/al.h"
+#include "AL/alc.h"
+#include "AL/alext.h"
+
+#include "alhelpers.h"
+
+
+/* InitAL opens a device and sets up a context using default attributes, making
+ * the program ready to call OpenAL functions. */
+int InitAL(char ***argv, int *argc)
+{
+    const ALCchar *name;
+    ALCdevice *device;
+    ALCcontext *ctx;
+
+    /* Open and initialize a device */
+    device = NULL;
+    if(argc && argv && *argc > 1 && strcmp((*argv)[0], "-device") == 0)
+    {
+        device = alcOpenDevice((*argv)[1]);
+        if(!device)
+            fprintf(stderr, "Failed to open \"%s\", trying default\n", (*argv)[1]);
+        (*argv) += 2;
+        (*argc) -= 2;
+    }
+    if(!device)
+        device = alcOpenDevice(NULL);
+    if(!device)
+    {
+        fprintf(stderr, "Could not open a device!\n");
+        return 1;
+    }
+
+    ctx = alcCreateContext(device, NULL);
+    if(ctx == NULL || alcMakeContextCurrent(ctx) == ALC_FALSE)
+    {
+        if(ctx != NULL)
+            alcDestroyContext(ctx);
+        alcCloseDevice(device);
+        fprintf(stderr, "Could not set a context!\n");
+        return 1;
+    }
+
+    name = NULL;
+    if(alcIsExtensionPresent(device, "ALC_ENUMERATE_ALL_EXT"))
+        name = alcGetString(device, ALC_ALL_DEVICES_SPECIFIER);
+    if(!name || alcGetError(device) != AL_NO_ERROR)
+        name = alcGetString(device, ALC_DEVICE_SPECIFIER);
+    printf("Opened \"%s\"\n", name);
+
+    return 0;
+}
+
+/* CloseAL closes the device belonging to the current context, and destroys the
+ * context. */
+void CloseAL(void)
+{
+    ALCdevice *device;
+    ALCcontext *ctx;
+
+    ctx = alcGetCurrentContext();
+    if(ctx == NULL)
+        return;
+
+    device = alcGetContextsDevice(ctx);
+
+    alcMakeContextCurrent(NULL);
+    alcDestroyContext(ctx);
+    alcCloseDevice(device);
+}
+
+
+const char *FormatName(ALenum format)
+{
+    switch(format)
+    {
+        case AL_FORMAT_MONO8: return "Mono, U8";
+        case AL_FORMAT_MONO16: return "Mono, S16";
+        case AL_FORMAT_STEREO8: return "Stereo, U8";
+        case AL_FORMAT_STEREO16: return "Stereo, S16";
+    }
+    return "Unknown Format";
+}

samples/openal/alhelpers.h

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+#ifndef ALHELPERS_H
+#define ALHELPERS_H
+
+#include "AL/alc.h"
+#include "AL/al.h"
+#include "AL/alext.h"
+
+#include "threads.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* Some helper functions to get the name from the format enums. */
+const char *FormatName(ALenum type);
+
+/* Easy device init/deinit functions. InitAL returns 0 on success. */
+int InitAL(char ***argv, int *argc);
+void CloseAL(void);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* ALHELPERS_H */

samples/openal/main.c

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+/*
+ * OpenAL Source Play Example
+ *
+ * Copyright (c) 2017 by Chris Robinson <[email protected]>
+ *
+ * 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 playing a sound buffer. */
+
+#include <stdio.h>
+#include <assert.h>
+
+#include <SDL.h>
+
+#include "AL/al.h"
+#include "AL/alc.h"
+
+#include "alhelpers.h"
+
+
+/* LoadBuffer loads the named audio file into an OpenAL buffer object, and
+ * returns the new buffer ID.
+ */
+static ALuint LoadSound(const char *filename)
+{
+    SDL_AudioSpec wav_spec;
+    Uint32 wav_length;
+    Uint8 *wav_buffer;
+    ALenum err, format;
+    ALuint buffer;
+
+    /* Load the WAV */
+    if (SDL_LoadWAV("test.wav", &wav_spec, &wav_buffer, &wav_length) == NULL) {
+        fprintf(stderr, "Could not open audio in %s: %s\n", filename, SDL_GetError());
+        return 0;
+    }
+
+    /* Get the sound format, and figure out the OpenAL format */
+    if(wav_spec.channels == 1)
+    {
+        if(wav_spec.format == AUDIO_U8)
+            format = AL_FORMAT_MONO8;
+        else if(wav_spec.format == AUDIO_S16SYS)
+            format = AL_FORMAT_MONO16;
+        else
+        {
+            fprintf(stderr, "Unsupported sample format: 0x%04x\n", wav_spec.format);
+            SDL_FreeWAV(wav_buffer);
+            return 0;
+        }
+    }
+    else if(wav_spec.channels == 2)
+    {
+        if(wav_spec.format == AUDIO_U8)
+            format = AL_FORMAT_STEREO8;
+        else if(wav_spec.format == AUDIO_S16SYS)
+            format = AL_FORMAT_STEREO16;
+        else
+        {
+            fprintf(stderr, "Unsupported sample format: 0x%04x\n", wav_spec.format);
+            SDL_FreeWAV(wav_buffer);
+            return 0;
+        }
+    }
+    else
+    {
+        fprintf(stderr, "Unsupported channel count: %d\n", wav_spec.channels);
+        SDL_FreeWAV(wav_buffer);
+        return 0;
+    }
+
+    /* 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, wav_buffer, wav_length, wav_spec.freq);
+    SDL_FreeWAV(wav_buffer);
+
+    /* 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)
+{
+    ALuint source, buffer;
+    ALfloat offset;
+    ALenum state;
+
+    /* Initialize OpenAL. */
+    if(InitAL(&argv, &argc) != 0)
+        return 1;
+
+    /* Load the sound into a buffer. */
+    buffer = LoadSound("D:\\sound.wav");
+    if(!buffer)
+    {
+        CloseAL();
+        return 1;
+    }
+
+    /* Create the source to play the sound with. */
+    source = 0;
+    alGenSources(1, &source);
+    alSourcei(source, AL_BUFFER, buffer);
+    assert(alGetError()==AL_NO_ERROR && "Failed to setup sound source");
+
+    /* Play the sound until it finishes. */
+    alSourcePlay(source);
+    do {
+        al_nssleep(10000000);
+        alGetSourcei(source, AL_SOURCE_STATE, &state);
+
+        /* Get the source offset. */
+        alGetSourcef(source, AL_SEC_OFFSET, &offset);
+        printf("\rOffset: %f  ", offset);
+        fflush(stdout);
+    } while(alGetError() == AL_NO_ERROR && state == AL_PLAYING);
+    printf("\n");
+
+    /* All done. Delete resources, and close down OpenAL. */
+    alDeleteSources(1, &source);
+    alDeleteBuffers(1, &buffer);
+
+    CloseAL();
+
+    return 0;
+}