/project/jni/sdl_sound/extra_rwops.c
https://github.com/aichunyu/FFPlayer · C · 135 lines · 73 code · 26 blank · 36 comment · 7 complexity · 887cf997cb8a515479f26856b6491752 MD5 · raw file
- /*
- * SDL_sound -- An abstract sound format decoding API.
- * Copyright (C) 2001 Ryan C. Gordon.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- /*
- * Some extra RWops that are needed or are just handy to have.
- *
- * Please see the file COPYING in the source's root directory.
- *
- * This file written by Ryan C. Gordon. (icculus@icculus.org)
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include "SDL.h"
- /*
- * The Reference Counter RWops...
- */
- typedef struct
- {
- SDL_RWops *rw; /* The actual RWops we're refcounting... */
- int refcount; /* The refcount; starts at 1. If goes to 0, delete. */
- } RWRefCounterData;
- /* Just pass through to the actual SDL_RWops's method... */
- static int refcounter_seek(SDL_RWops *rw, int offset, int whence)
- {
- RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
- return(data->rw->seek(data->rw, offset, whence));
- } /* refcounter_seek */
- /* Just pass through to the actual SDL_RWops's method... */
- static int refcounter_read(SDL_RWops *rw, void *ptr, int size, int maxnum)
- {
- RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
- return(data->rw->read(data->rw, ptr, size, maxnum));
- } /* refcounter_read */
- /* Just pass through to the actual SDL_RWops's method... */
- static int refcounter_write(SDL_RWops *rw, const void *ptr, int size, int num)
- {
- RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
- return(data->rw->write(data->rw, ptr, size, num));
- } /* refcounter_write */
- /*
- * Decrement the reference count. If there are no more references, pass
- * through to the actual SDL_RWops's method, and then clean ourselves up.
- */
- static int refcounter_close(SDL_RWops *rw)
- {
- int retval = 0;
- RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
- data->refcount--;
- if (data->refcount <= 0)
- {
- retval = data->rw->close(data->rw);
- free(data);
- SDL_FreeRW(rw);
- } /* if */
- return(retval);
- } /* refcounter_close */
- void RWops_RWRefCounter_addRef(SDL_RWops *rw)
- {
- RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
- data->refcount++;
- } /* RWops_RWRefCounter_addRef */
- SDL_RWops *RWops_RWRefCounter_new(SDL_RWops *rw)
- {
- SDL_RWops *retval = NULL;
- if (rw == NULL)
- {
- SDL_SetError("NULL argument to RWops_RWRefCounter_new().");
- return(NULL);
- } /* if */
- retval = SDL_AllocRW();
- if (retval != NULL)
- {
- RWRefCounterData *data;
- data = (RWRefCounterData *) malloc(sizeof (RWRefCounterData));
- if (data == NULL)
- {
- SDL_SetError("Out of memory.");
- SDL_FreeRW(retval);
- retval = NULL;
- } /* if */
- else
- {
- data->rw = rw;
- data->refcount = 1;
- retval->hidden.unknown.data1 = data;
- retval->seek = refcounter_seek;
- retval->read = refcounter_read;
- retval->write = refcounter_write;
- retval->close = refcounter_close;
- } /* else */
- } /* if */
- return(retval);
- } /* RWops_RWRefCounter_new */
- /* end of extra_rwops.c ... */