1 /*

     2 * OpenAL Bridge - a simple portable library for OpenAL interface

     3 * Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com>

     4 *

     5 * This program is free software; you can redistribute it and/or modify

     6 * it under the terms of the GNU Lesser General Public License as published by

     7 * the Free Software Foundation; version 2 of the License

     8 *

     9 * This program is distributed in the hope that it will be useful,

    10 * but WITHOUT ANY WARRANTY; without even the implied warranty of

    11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    12 * GNU Lesser General Public License for more details.

    13 *

    14 * You should have received a copy of the GNU Lesser General Public License

    15 * along with this program; if not, write to the Free Software

    16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

    17 */

    18 

    19 #include "wrappers.h"

    20 #include "openalbridge_t.h"

    21 

    22 extern ALint *Sources;

    23 

    24 void *Malloc (size_t nbytes) {

    25     void *aptr;

    26 

    27     if ((aptr = malloc(nbytes)) == NULL) {

    28         fprintf(stderr,"(Bridge Fatal Error) - not enough memory");

    29         abort();

    30     }

    31     

    32     return aptr;

    33 }

    34 

    35 

    36 void *Realloc (void *aptr, size_t nbytes) {

    37     aptr = realloc(aptr, nbytes);

    38 

    39     if (aptr == NULL) {

    40         fprintf(stderr,"(Bridge Fatal Error) - not enough memory");

    41         abort();

    42     }

    43 

    44     return aptr;

    45 }

    46 

    47 

    48 FILE *Fopen (const char *fname, char *mode)	{

    49     FILE *fp;

    50 

    51     fp = fopen(fname,mode);

    52     if (fp == NULL)

    53         fprintf(stderr,"(Bridge Error) - can't open file %s in mode '%s'", fname, mode);

    54 

    55     return fp;

    56 }

    57 

    58 

    59 void helper_fade(void *tmp) {

    60     ALfloat gain;

    61     ALfloat target_gain;

    62     fade_t *fade;

    63     uint32_t index;

    64     uint16_t quantity;

    65     al_fade_t type;

    66 

    67     fade = tmp;

    68     index = fade->index;

    69     quantity = fade->quantity;

    70     type = fade->type;

    71     free (fade);

    72 

    73     if (type == AL_FADE_IN) {

    74 #ifdef DEBUG

    75         fprintf(stderr,"(Bridge Info) - Fade-in in progress [index %d quantity %d]", index, quantity);

    76 #endif

    77 

    78         // save the volume desired after the fade

    79         alGetSourcef(Sources[index], AL_GAIN, &target_gain);

    80         if (target_gain > 1.0f || target_gain <= 0.0f)

    81             target_gain = 1.0f;

    82 

    83         alSourcePlay(Sources[index]);

    84 

    85         for (gain = 0.0f ; gain <= target_gain; gain += (float) quantity/10000) {

    86 #ifdef TRACE

    87             err_msg("(%s) DEBUG - Fade-in set gain to %f", gain);

    88 #endif

    89             alSourcef(Sources[index], AL_GAIN, gain);

    90             usleep(10000);

    91         }

    92     } else {

    93         alGetSourcef(Sources[index], AL_GAIN, &target_gain);

    94 

    95         for (gain = target_gain; gain >= 0.00f; gain -= (float) quantity/10000) {

    96 #ifdef TRACE

    97             err_msg("(%s) DEBUG - Fade-out set gain to %f", gain);

    98 #endif

    99             alSourcef(Sources[index], AL_GAIN, gain);

   100             usleep(10000);

   101         }

   102 

   103         if (AL_NO_ERROR != alGetError())

   104             fprintf(stderr,"(Bridge Warning) - Failed to set fade-out effect");

   105 

   106         // stop that sound and reset its volume

   107         alSourceStop (Sources[index]);

   108         alSourcef (Sources[index], AL_GAIN, target_gain);

   109     }

   110 

   111     if (AL_NO_ERROR != alGetError())

   112         fprintf(stderr,"(Bridge Warning) - Failed to set fade effect");

   113 

   114 #ifndef _WIN32

   115     pthread_exit(NULL);

   116 #else

   117     _endthread();

   118 #endif

   119 }

   120