1 files changed, 97 insertions, 0 deletions
diff --git a/icedax/ringbuff.h b/icedax/ringbuff.h
new file mode 100644
index 0000000..6c85b3a
--- /dev/null
+++ b/icedax/ringbuff.h
@@ -0,0 +1,97 @@
+/*
+ * This file has been modified for the cdrkit suite.
+ *
+ * The behaviour and appearence of the program code below can differ to a major
+ * extent from the version distributed by the original author(s).
+ *
+ * For details, see Changelog file distributed with the cdrkit package. If you
+ * received this file from another source then ask the distributing person for
+ * a log of modifications.
+ *
+ */
+
+/* @(#)ringbuff.h	1.5 01/10/20 Copyright 1998,1999,2000 Heiko Eissfeldt */
+/* This file contains data structures that reside in the shared memory
+ * segment.
+ */
+
+
+/* the linux semctl prototype is broken as is the definition
+   of union semun in sys/sem.h. */
+
+#ifdef HAVE_UNION_SEMUN
+#	define	my_semun	semun
+#else
+union my_semun {
+  int val;
+  struct semid_ds *pid;
+  unsigned short *array;
+};
+#endif
+
+/* Ringbuffer structures.
+   Space for the ringbuffer is allocated page aligned
+	 and contains the following
+
+	-------------------- start of page
+	header (once for the ring buffer) \\
+	space for page alignment	  ||+- HEADER_SIZE
+RB_BASE -+v				  ||
+	myringbuffer.offset		  |/
+	-------------------- start of page/-- pagesize
+	myringbuffer.data (SEGMENT_SIZE)\
+	space for page alignment	|+- ENTRY_SIZE_PAGE_AL
+	myringbuffer.offset		/
+	-------------------- start of page
+	myringbuffer.data
+	space for page alignment
+	...
+*/	
+typedef struct {
+  int offset;
+  UINT4 data[CD_FRAMESAMPLES];
+} myringbuff;
+
+struct ringbuffheader {
+  myringbuff *p1;
+  myringbuff *p2;
+  volatile unsigned long total_read;
+  volatile unsigned long total_written;
+  volatile int child_waitstate;
+  volatile int parent_waitstate;
+  volatile int input_littleendian;
+  volatile int end_is_reached;
+  volatile unsigned long nSamplesToDo;
+  int offset;
+  UINT4 data[CD_FRAMESAMPLES];
+};
+
+extern myringbuff **he_fill_buffer;
+extern myringbuff **last_buffer;
+extern volatile unsigned long *total_segments_read;
+extern volatile unsigned long *total_segments_written;
+extern volatile int *child_waits;
+extern volatile int *parent_waits;
+extern volatile int *in_lendian;
+extern volatile int *eorecording;
+
+#define palign(x, a)    (((char *)(x)) + ((a) - 1 - (((unsigned)((x)-1))%(a))))
+#define multpage(x, a)    ((((x) + (a) - 1) / (a)) * (a))
+
+#define HEADER_SIZE multpage(offset_of(struct ringbuffheader, data), global.pagesize)
+#define SEGMENT_SIZE (global.nsectors*CD_FRAMESIZE_RAW)
+#define ENTRY_SIZE_PAGE_AL multpage(SEGMENT_SIZE + offset_of(myringbuff, data), global.pagesize)
+
+#define RB_BASE ((myringbuff *)(((unsigned char *)he_fill_buffer) + HEADER_SIZE - offset_of(myringbuff, data)))
+
+#define INC(a) (myringbuff *)(((char *)RB_BASE) + (((((char *) (a))-((char *)RB_BASE))/ENTRY_SIZE_PAGE_AL + 1) % total_buffers)*ENTRY_SIZE_PAGE_AL)
+
+
+void set_total_buffers(unsigned int num_buffers, int mysem_id);
+const myringbuff *get_previous_read_buffer(void);
+const myringbuff *get_he_fill_buffer(void);
+myringbuff *get_next_buffer(void);
+myringbuff *get_oldest_buffer(void);
+void define_buffer(void);
+void drop_buffer(void);
+void drop_all_buffers(void);