1 files changed, 143 insertions, 0 deletions
diff --git a/system/pdp_type.c b/system/pdp_type.c
new file mode 100644
index 0000000..b23b9cd
--- /dev/null
+++ b/system/pdp_type.c
@@ -0,0 +1,143 @@
+/*
+ *   Pure Data Packet system implementation. : code for handling different packet types
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program 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 General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+#include "pdp.h"
+#include <stdio.h>
+
+/* all symbols are C style */
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+
+/****************** packet type checking methods ********************/
+
+
+/* check if two packets are allocated and of the same type */
+int pdp_type_compat(int packet0, int packet1)
+{
+
+    t_pdp *header0 = pdp_packet_header(packet0);
+    t_pdp *header1 = pdp_packet_header(packet1);
+
+    if (!(header1)){
+	//post("pdp_type_compat: invalid header packet1");
+	return 0;
+    }
+    if (!(header0)){
+	//post("pdp_type_compat: invalid header packet 0");
+	return 0;
+    }
+    if (header0->type != header1->type){
+	//post("pdp_type_compat: types do not match");
+	return 0;
+    }
+
+    return 1;
+}
+
+/* check if two image packets are allocated and of the same type */
+int pdp_type_compat_image(int packet0, int packet1)
+{
+    t_pdp *header0 = pdp_packet_header(packet0);
+    t_pdp *header1 = pdp_packet_header(packet1);
+
+
+    if (!(pdp_type_compat(packet0, packet1))) return 0;
+    if (header0->type != PDP_IMAGE){
+	//post("pdp_type_compat_image: not a PDP_IMAGE");
+	return 0;
+    }
+    if (header0->info.image.encoding != header1->info.image.encoding){
+	//post("pdp_type_compat_image: encodings differ");
+	return 0;
+    }
+    if (header0->info.image.width != header1->info.image.width){
+	//post("pdp_type_compat_image: image withs differ");
+	return 0;
+    }
+    if (header0->info.image.height != header1->info.image.height){
+	//post("pdp_type_compat_image: image heights differ");
+	return 0;
+    }
+    return 1;
+}
+
+/* check if packet is a valid image packet */
+int pdp_type_isvalid_image(int packet)
+{
+    t_pdp *header = pdp_packet_header(packet);
+    if (!header) return 0;
+    if (PDP_IMAGE != header->type) return 0;
+    if ((PDP_IMAGE_YV12 != header->info.image.encoding)
+	&& (PDP_IMAGE_GREY != header->info.image.encoding)) return 0;
+
+    return 1;
+
+}
+
+
+
+int pdp_packet_new_image_yv12(u32 w, u32 h)
+{
+    t_pdp *header;
+    int packet;
+
+
+    u32 size = w*h;
+    u32 totalnbpixels = size + (size >> 1);
+    u32 packet_size = totalnbpixels << 1;
+
+    packet = pdp_packet_new(PDP_IMAGE, packet_size);
+    header = pdp_packet_header(packet);
+
+    header->info.image.encoding = PDP_IMAGE_YV12;
+    header->info.image.width = w;
+    header->info.image.height = h;
+
+    return packet;
+}
+
+int pdp_packet_new_image_grey(u32 w, u32 h)
+{
+    t_pdp *header;
+    int packet;
+
+
+    u32 size = w*h;
+    u32 totalnbpixels = size;
+    u32 packet_size = totalnbpixels << 1;
+
+    packet = pdp_packet_new(PDP_IMAGE, packet_size);
+    header = pdp_packet_header(packet);
+
+    header->info.image.encoding = PDP_IMAGE_GREY;
+    header->info.image.width = w;
+    header->info.image.height = h;
+
+    return packet;
+}
+
+
+
+
+#ifdef __cplusplus
+}
+#endif