1 files changed, 112 insertions, 0 deletions
diff --git a/lib/libucsi/atsc/ac3_descriptor.h b/lib/libucsi/atsc/ac3_descriptor.h
new file mode 100644
index 0000000..489695b
--- /dev/null
+++ b/lib/libucsi/atsc/ac3_descriptor.h
@@ -0,0 +1,112 @@
+/*
+ * section and descriptor parser
+ *
+ * Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
+ * Copyright (C) 2005 Andrew de Quincey (adq_atsc@lidskialf.net)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef _UCSI_ATSC_AC3_DESCRIPTOR
+#define _UCSI_ATSC_AC3_DESCRIPTOR 1
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include <libucsi/descriptor.h>
+#include <libucsi/endianops.h>
+
+enum atsc_ac3_channels {
+	ATSC_AC3_CHANNELS_1_PLUS_1	= 0x0,
+	ATSC_AC3_CHANNELS_1_0		= 0x1,
+	ATSC_AC3_CHANNELS_2_0		= 0x2,
+	ATSC_AC3_CHANNELS_3_0		= 0x3,
+	ATSC_AC3_CHANNELS_2_1		= 0x4,
+	ATSC_AC3_CHANNELS_3_1 		= 0x5,
+	ATSC_AC3_CHANNELS_2_2		= 0x6,
+	ATSC_AC3_CHANNELS_3_2		= 0x7,
+	ATSC_AC3_CHANNELS_1		= 0x8,
+	ATSC_AC3_CHANNELS_LTEQ_2	= 0x9,
+	ATSC_AC3_CHANNELS_LTEQ_3	= 0xa,
+	ATSC_AC3_CHANNELS_LTEQ_4	= 0xb,
+	ATSC_AC3_CHANNELS_LTEQ_5	= 0xc,
+	ATSC_AC3_CHANNELS_LTEQ_6	= 0xd,
+};
+
+/**
+ * atsc_ac3_descriptor structure.
+ */
+struct atsc_ac3_descriptor {
+	struct descriptor d;
+
+  EBIT2(uint8_t sample_rate_code        : 3; ,
+	uint8_t bsid			: 5; );
+  EBIT2(uint8_t bit_rate_code	        : 6; ,
+	uint8_t surround_mode		: 2; );
+  EBIT3(uint8_t bsmod		        : 3; ,
+	uint8_t num_channels		: 4; ,
+	uint8_t full_svc		: 1; );
+	/* uint8_t additional_info[] */
+} __ucsi_packed;
+
+/**
+ * Process an atsc_ac3_descriptor.
+ *
+ * @param d Generic descriptor structure.
+ * @return atsc_ac3_descriptor pointer, or NULL on error.
+ */
+static inline struct atsc_ac3_descriptor*
+	atsc_ac3_descriptor_codec(struct descriptor* d)
+{
+	int pos = 0;
+
+	if (d->len < (pos+4))
+		return NULL;
+	pos += 4;
+
+	return (struct atsc_ac3_descriptor*) d;
+}
+
+/**
+ * Retrieve pointer to additional_info field of a atsc_ac3_descriptor.
+ *
+ * @param d atsc_ac3_descriptor pointer.
+ * @return Pointer to additional_info field.
+ */
+static inline uint8_t *atsc_ac3_descriptor_additional_info(struct atsc_ac3_descriptor *d)
+{
+	int pos = sizeof(struct atsc_ac3_descriptor);
+
+	return ((uint8_t *) d) + pos;
+}
+
+/**
+ * Determine length of additional_info field of a atsc_ac3_descriptor.
+ *
+ * @param d atsc_ac3_descriptor pointer.
+ * @return Length of field in bytes.
+ */
+static inline int atsc_ac3_descriptor_additional_info_length(struct atsc_ac3_descriptor* d)
+{
+	return d->d.len - 3;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif