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107 lines
2.7 KiB
C++
107 lines
2.7 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#include "sci/sfx/sfx_iterator.h"
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#include "sci/tools.h" /* for BREAKPOINT */
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#include "sci/include/sci_memory.h"
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namespace Sci {
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#define D ((pcm_data_internal_t *)self->internal)
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static int pi_poll(sfx_pcm_feed_t *self, byte *dest, int size);
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static void pi_destroy(sfx_pcm_feed_t *self);
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typedef struct {
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byte *base_data;
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byte *data;
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int frames_left;
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} pcm_data_internal_t;
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static sfx_pcm_feed_t pcm_it_prototype = {
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pi_poll,
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pi_destroy,
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NULL, /* No timestamp getter */
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NULL, /* Internal data goes here */
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{0, 0, 0}, /* Must fill in configuration */
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"song-iterator",
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0, /* Ideally the resource number should go here */
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0 /* The mixer computes this for us */
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};
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sfx_pcm_feed_t *sfx_iterator_make_feed(byte *base_data, int offset, int size, sfx_pcm_config_t conf) {
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sfx_pcm_feed_t *feed;
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pcm_data_internal_t *idat;
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byte *data = base_data + offset;
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if (!data) {
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/* Now this is silly; why'd you call this function in the first place? */
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return NULL;
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}
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sci_refcount_incref(base_data);
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idat = (pcm_data_internal_t*)sci_malloc(sizeof(pcm_data_internal_t));
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idat->base_data = base_data;
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idat->data = data;
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idat->frames_left = size;
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feed = (sfx_pcm_feed_t*)sci_malloc(sizeof(sfx_pcm_feed_t));
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*feed = pcm_it_prototype;
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feed->internal = idat;
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feed->conf = conf;
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return feed;
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}
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static int pi_poll(sfx_pcm_feed_t *self, byte *dest, int size) {
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int data_len;
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if (size >= D->frames_left)
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size = D->frames_left;
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D->frames_left -= size;
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data_len = size * self->frame_size;
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memcpy(dest, D->data, data_len);
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#if 0
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memset(dest, 0xff, data_len);
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#endif
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D->data += data_len;
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return size;
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}
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static void pi_destroy(sfx_pcm_feed_t *self) {
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sci_refcount_decref(D->base_data);
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free(D);
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free(self);
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}
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} // End of namespace Sci
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