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 

    21 

    22 #ifdef __CPLUSPLUS

    23 extern "C" {

    24 #endif 

    25     

    26     extern ALint *Sources;

    27     

    28     void *Malloc (size_t nbytes) {

    29         void *aptr;

    30         

    31         if ((aptr = malloc(nbytes)) == NULL)

    32             err_dump("(%s) FATAL - not enough memory");

    33         

    34         return aptr;

    35     }

    36     

    37     

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

    39         aptr = realloc(aptr, nbytes);

    40         

    41         if (aptr == NULL) 

    42             err_dump("(%s) FATAL - not enough memory");

    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             err_ret("(%s) ERROR - can't open file %s in mode '%s'", prog, fname, mode);

    54         

    55         return fp;

    56     }

    57     

    58     /*TODO make a proper error reporting routine*/

    59     ALint AlGetError (const char *str) {

    60         ALenum error;

    61         

    62         error = alGetError();

    63         if (error != AL_NO_ERROR) {

    64             err_msg(str, prog);

    65             return error;

    66         } else 

    67             return AL_TRUE;

    68     }

    69     

    70     ALint AlGetError2 (const char *str, int num) {

    71         ALenum error;

    72         

    73         error = alGetError();

    74         if (error != AL_NO_ERROR) {

    75             err_msg(str, prog, num);

    76             return error;

    77         } else 

    78             return AL_TRUE;

    79     }

    80     

    81     void *helper_fadein(void *tmp) {

    82         ALfloat gain;

    83         ALfloat target_gain;

    84         fade_t *fade;

    85         uint32_t index; 

    86         uint16_t quantity; 

    87         

    88         fade = tmp;

    89         index = fade->index;

    90         quantity = fade->quantity;

    91         free (fade);

    92         

    93 #ifdef DEBUG

    94         err_msg("(%s) INFO - Fade-in in progress [index %d quantity %d]", prog, index, quantity);

    95 #endif

    96         

    97         /*save the volume desired after the fade*/

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

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

   100             target_gain = 1.0f;

   101         

   102         alSourcePlay(Sources[index]);

   103         

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

   105 #ifdef TRACE

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

   107 #endif

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

   109             usleep(10000);

   110         }

   111         

   112         AlGetError("(%s) WARN - Failed to set fade-in volume level");

   113         

   114 #ifndef _WIN32

   115         pthread_exit(NULL);

   116 #else

   117         _endthread();

   118 #endif

   119         return 0;

   120     }

   121     

   122     void *helper_fadeout(void *tmp) {

   123         ALfloat gain;

   124         ALfloat old_gain;

   125         fade_t *fade;

   126         uint32_t index; 

   127         uint16_t quantity; 

   128         

   129         fade = tmp;

   130         index = fade->index;

   131         quantity = fade->quantity;

   132         free(fade);

   133         

   134 #ifdef DEBUG

   135         err_msg("(%s) INFO - Fade-out in progress [index %d quantity %d]", prog, index, quantity);

   136 #endif

   137         

   138         alGetSourcef(Sources[index], AL_GAIN, &old_gain);

   139         

   140         for (gain = old_gain; gain >= 0.00f; gain -= (float) quantity/10000) {

   141 #ifdef TRACE

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

   143 #endif

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

   145             usleep(10000);

   146         }

   147         

   148         AlGetError("(%s) WARN - Failed to set fade-out volume level");

   149         

   150         /*stop that sound and reset its volume*/

   151         alSourceStop (Sources[index]);

   152         alSourcef (Sources[index], AL_GAIN, old_gain);	

   153         

   154 #ifndef _WIN32

   155         pthread_exit(NULL);

   156 #else

   157         _endthread();

   158 #endif

   159         return 0;

   160     }

   161     

   162     

   163 #ifdef __CPLUSPLUS

   164 }

   165 #endif