dynamic_ogg.c
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SDL_mixer: An audio mixer library based on the SDL library
Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
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*/
#ifdef OGG_MUSIC
#include "SDL_loadso.h"
#include "dynamic_ogg.h"
vorbis_loader vorbis = {
0, NULL
};
#ifdef OGG_DYNAMIC
int Mix_InitOgg()
{
if ( vorbis.loaded == 0 ) {
vorbis.handle = SDL_LoadObject(OGG_DYNAMIC);
if ( vorbis.handle == NULL ) {
return -1;
}
vorbis.ov_clear =
(int (*)(OggVorbis_File *))
SDL_LoadFunction(vorbis.handle, "ov_clear");
if ( vorbis.ov_clear == NULL ) {
SDL_UnloadObject(vorbis.handle);
return -1;
}
vorbis.ov_info =
(vorbis_info *(*)(OggVorbis_File *,int))
SDL_LoadFunction(vorbis.handle, "ov_info");
if ( vorbis.ov_info == NULL ) {
SDL_UnloadObject(vorbis.handle);
return -1;
}
vorbis.ov_open_callbacks =
(int (*)(void *, OggVorbis_File *, char *, long, ov_callbacks))
SDL_LoadFunction(vorbis.handle, "ov_open_callbacks");
if ( vorbis.ov_open_callbacks == NULL ) {
SDL_UnloadObject(vorbis.handle);
return -1;
}
vorbis.ov_pcm_total =
(ogg_int64_t (*)(OggVorbis_File *,int))
SDL_LoadFunction(vorbis.handle, "ov_pcm_total");
if ( vorbis.ov_pcm_total == NULL ) {
SDL_UnloadObject(vorbis.handle);
return -1;
}
vorbis.ov_read =
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#ifdef OGG_USE_TREMOR
(long (*)(OggVorbis_File *,char *,int,int *))
#else
(long (*)(OggVorbis_File *,char *,int,int,int,int,int *))
#endif
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SDL_LoadFunction(vorbis.handle, "ov_read");
if ( vorbis.ov_read == NULL ) {
SDL_UnloadObject(vorbis.handle);
return -1;
}
vorbis.ov_time_seek =
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#ifdef OGG_USE_TREMOR
(long (*)(OggVorbis_File *,ogg_int64_t))
#else
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(int (*)(OggVorbis_File *,double))
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SDL_LoadFunction(vorbis.handle, "ov_time_seek");
if ( vorbis.ov_time_seek == NULL ) {
SDL_UnloadObject(vorbis.handle);
return -1;
}
}
++vorbis.loaded;
return 0;
}
void Mix_QuitOgg()
{
if ( vorbis.loaded == 0 ) {
return;
}
if ( vorbis.loaded == 1 ) {
SDL_UnloadObject(vorbis.handle);
}
--vorbis.loaded;
}
#else
int Mix_InitOgg()
{
if ( vorbis.loaded == 0 ) {
vorbis.ov_clear = ov_clear;
vorbis.ov_info = ov_info;
vorbis.ov_open_callbacks = ov_open_callbacks;
vorbis.ov_pcm_total = ov_pcm_total;
vorbis.ov_read = ov_read;
vorbis.ov_time_seek = ov_time_seek;
}
++vorbis.loaded;
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return 0;
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}
void Mix_QuitOgg()
{
if ( vorbis.loaded == 0 ) {
return;
}
if ( vorbis.loaded == 1 ) {
}
--vorbis.loaded;
}
#endif /* OGG_DYNAMIC */
#endif /* OGG_MUSIC */