1 files changed, 117 insertions, 0 deletions
diff --git a/engines/sci/sfx/pcm-iterator.c b/engines/sci/sfx/pcm-iterator.c
new file mode 100644
index 0000000000..8d9b86ed0d
--- /dev/null
+++ b/engines/sci/sfx/pcm-iterator.c
@@ -0,0 +1,117 @@
+/***************************************************************************
+ 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 <sfx_iterator.h>
+#include <resource.h> /* for BREAKPOINT */
+#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);
+	sci_free(D);
+	sci_free(self);
+}