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/***************************************************************************
pcm-iterator.c Copyright (C) 2002 Christoph Reichenbach
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public Licence as
published by the Free Software Foundaton; either version 2 of the
Licence, or (at your option) any later version.
It is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
merchantibility or fitness for a particular purpose. See the
GNU General Public Licence for more details.
You should have received a copy of the GNU General Public Licence
along with this program; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Please contact the maintainer for any program-related bug reports or
inquiries.
Current Maintainer:
Christoph Reichenbach (CR) <jameson@linuxgames.com>
***************************************************************************/
#include "sci/include/sfx_iterator.h"
#include "sci/include/resource.h" /* for BREAKPOINT */
#include "sci/include/sci_memory.h"
#define D ((pcm_data_internal_t *)self->internal)
static int
pi_poll(sfx_pcm_feed_t *self, byte *dest, int size);
static void
pi_destroy(sfx_pcm_feed_t *self);
typedef struct {
byte *base_data;
byte *data;
int frames_left;
} pcm_data_internal_t;
static sfx_pcm_feed_t pcm_it_prototype = {
pi_poll,
pi_destroy,
NULL, /* No timestamp getter */
NULL, /* Internal data goes here */
{0, 0, 0}, /* Must fill in configuration */
"song-iterator",
0, /* Ideally the resource number should go here */
0 /* The mixer computes this for us */
};
sfx_pcm_feed_t *
sfx_iterator_make_feed(byte *base_data,
int offset,
int size,
sfx_pcm_config_t conf) {
sfx_pcm_feed_t *feed;
pcm_data_internal_t *idat;
byte *data = base_data + offset;
if (!data) {
/* Now this is silly; why'd you call this function in the first place? */
return NULL;
}
sci_refcount_incref(base_data);
idat = (pcm_data_internal_t*)sci_malloc(sizeof(pcm_data_internal_t));
idat->base_data = base_data;
idat->data = data;
idat->frames_left = size;
feed = (sfx_pcm_feed_t*)sci_malloc(sizeof(sfx_pcm_feed_t));
*feed = pcm_it_prototype;
feed->internal = idat;
feed->conf = conf;
return feed;
}
static int
pi_poll(sfx_pcm_feed_t *self, byte *dest, int size) {
int data_len;
if (size >= D->frames_left)
size = D->frames_left;
D->frames_left -= size;
data_len = size * self->frame_size;
memcpy(dest, D->data, data_len);
#if 0
memset(dest, 0xff, data_len);
#endif
D->data += data_len;
return size;
}
static void
pi_destroy(sfx_pcm_feed_t *self) {
sci_refcount_decref(D->base_data);
free(D);
free(self);
}
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