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-rw-r--r--lib/libucsi/atsc/ac3_descriptor.h112
1 files changed, 112 insertions, 0 deletions
diff --git a/lib/libucsi/atsc/ac3_descriptor.h b/lib/libucsi/atsc/ac3_descriptor.h
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+/*
+ * 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