1 files changed, 129 insertions, 0 deletions
diff --git a/sys/dxr3/ac3_padder.h b/sys/dxr3/ac3_padder.h
new file mode 100644
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--- /dev/null
+++ b/sys/dxr3/ac3_padder.h
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+/* GStreamer
+ * Copyright (C) 2003 Martin Soto <martinsoto@users.sourceforge.net>
+ *
+ * ac3_padder.h: Pad AC3 frames for use with an SPDIF interface. 
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef AC3_PADDER_INC
+#define AC3_PADDER_INC
+
+#include <glib.h>
+
+
+/* Size of an IEC958 padded AC3 frame. */
+#define AC3P_IEC_FRAME_SIZE 6144
+/* Size of the IEC958 header. */
+#define AC3P_IEC_HEADER_SIZE 8
+/* Size of the AC3 header. */
+#define AC3P_AC3_HEADER_SIZE 7
+
+
+/* An IEC958 padded AC3 frame. */
+typedef struct {
+  /* IEC header. */
+  guchar header[AC3P_IEC_HEADER_SIZE];
+
+  /* Begin of AC3 header. */
+  guchar sync_byte1;
+  guchar sync_byte2;
+
+  guchar crc1[2];
+  guchar code;
+  guchar bsidmod;
+  guchar acmod;
+  /* End of AC3 header. */
+  
+  unsigned char data[AC3P_IEC_FRAME_SIZE - AC3P_IEC_HEADER_SIZE 
+                     - AC3P_AC3_HEADER_SIZE];
+} ac3p_iec958_burst_frame;
+
+
+/* Possible states for the reading automaton: */
+
+/* Searching for sync byte 1. */
+#define AC3P_STATE_SYNC1 1
+/* Searching for sync byte 2. */
+#define AC3P_STATE_SYNC2 2
+/* Reading AC3 header. */
+#define AC3P_STATE_HEADER 3
+/* Reading packet contents.*/
+#define AC3P_STATE_CONTENT 4
+
+
+/* Events generated by the parse function: */
+
+/* The parser needs new data to be pushed. */
+#define AC3P_EVENT_PUSH 1
+/* There is a new padded frame ready to read from the padder structure. */
+#define AC3P_EVENT_FRAME 2
+
+
+/* The internal state for the padder. */
+typedef struct {
+  guint state;       /* State of the reading automaton. */
+
+  guchar *in_ptr;    /* Input pointer, marking the current
+                        postion in the input buffer. */
+  guint remaining;   /* The number of bytes remaining in the current
+                        reading buffer. */
+
+  guchar *out_ptr;   /* Output pointer, marking the current
+                        position in the output frame. */
+  guint bytes_to_copy;
+                     /* Number of bytes that still must be copied
+                        to the output frame *during this reading
+                        stage*. */
+
+  guint ac3_frame_size;
+                     /* The size in bytes of the pure AC3 portion
+                        of the current frame. */
+
+  ac3p_iec958_burst_frame frame;
+                     /* The current output frame. */
+} ac3_padder;
+
+
+
+extern void
+ac3p_init(ac3_padder *padder);
+
+extern void
+ac3p_push_data(ac3_padder *padder, guchar *data, guint size);
+
+extern int
+ac3p_parse(ac3_padder *padder);
+
+
+/**
+ * ac3p_frame
+ * @padder The padder structure.
+ *
+ * Returns a pointer to the padded frame contained in the padder.
+ */
+#define ac3p_frame(padder) ((guint *) &((padder)->frame))
+
+/**
+ * ac3p_frame_size
+ * @padder The padder structure.
+ *
+ * Returns the length in bytes of the last read raw AC3 frame.
+ */
+#define ac3p_frame_size(padder) ((padder)->ac3_frame_size)
+
+
+#endif