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Coin / src / misc / AudioTools.cpp

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/**************************************************************************\
 * Copyright (c) Kongsberg Oil & Gas Technologies AS
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\**************************************************************************/

#include "misc/AudioTools.h"

#include <stdio.h>
#include <assert.h>
#include <stdlib.h>

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif // HAVE_CONFIG_H

#include <Inventor/SbString.h>
#include <Inventor/C/tidbits.h>

#include "tidbitsp.h"
#include "glue/openal_wrapper.h"

// *************************************************************************

// There are some differences in error defines between different
// versions of OpenAL, and we try to fix them up below.
//
// (It even looks like some of these defines have been set up
// exclusively for MSWindows usage, while others are for other
// platforms. Really great interface design there from the OpenAL
// developers...)
#ifndef AL_ILLEGAL_ENUM
#define AL_ILLEGAL_ENUM AL_INVALID_ENUM
#endif // !AL_ILLEGAL_ENUM
#ifndef AL_ILLEGAL_COMMAND
#define AL_ILLEGAL_COMMAND AL_INVALID_OPERATION
#endif // !AL_ILLEGAL_COMMAND

// *************************************************************************

const char *
coin_get_openal_error(int errcode)
{
  switch (errcode) {
  case AL_INVALID_NAME:
    return "AL_INVALID_NAME - Illegal name passed as an argument to an AL call";

  case AL_INVALID_ENUM:
    return "AL_INVALID_ENUM - Illegal enum passed as an argument to an AL call";

  case AL_INVALID_VALUE:
    return "AL_INVALID_VALUE - Illegal value passed as an argument to an AL call";

  case AL_INVALID_OPERATION:
    return "AL_INVALID_OPERATION - A function was called at an inappropriate time or in an inappropriate way, causing an illegal state. This can be an incompatible ALenum, object ID, and/or function";

  case AL_OUT_OF_MEMORY:
    return "AL_OUT_OF_MEMORY - A function could not be completed, because there is not enough memory available.";

  default:
    return "UNDEFINED ERROR";
  }
}

/* Return value of COIN_DEBUG_AUDIO environment variable. */
int
coin_debug_audio(void)
{
  static int d = -1;
  if (d == -1) {
    const char * val = coin_getenv("COIN_DEBUG_AUDIO");
    d = val ? atoi(val) : 0;
  }
  return (d > 0) ? 1 : 0;
}

// *************************************************************************

// The following data and functions are used to avoid
// SoAudioRenderAction being applied to the scene graph unless there
// has been at least one sound-emitting node instantiated.

static SbBool should_traverse = FALSE;

static void audio_cleanup(void) 
{
  should_traverse = FALSE;
}

// Called from the constructor of SoVRMLAudioClip and SoVRMLSound.
// After this has been called once, SoSceneManager instances will
// start applying an SoAudioRenderAction to its scene graph before
// rendering, at each frame.
//
// This is far from perfect design, but it is better than how it used
// to be (SoAudioRenderAction _always_ applied, even when no sound
// nodes had even been instantiated by the application -- which I
// presume is the common case, actually).
//
// 20050627 mortene.
void
coin_sound_enable_traverse(void)
{
  should_traverse = TRUE;
  coin_atexit((coin_atexit_f*) audio_cleanup, CC_ATEXIT_NORMAL);
}

// Called from SoSceneManager::render() to decide whether or not to
// invoke its SoAudioRenderAction on its scene graph.
SbBool
coin_sound_should_traverse(void)
{
  return should_traverse;
}

// *************************************************************************