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-rw-r--r--lib/libucsi/mpeg/content_labelling_descriptor.h356
1 files changed, 356 insertions, 0 deletions
diff --git a/lib/libucsi/mpeg/content_labelling_descriptor.h b/lib/libucsi/mpeg/content_labelling_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_dvb@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_MPEG_CONTENT_LABELLING_DESCRIPTOR
+#define _UCSI_MPEG_CONTENT_LABELLING_DESCRIPTOR 1
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include <libucsi/descriptor.h>
+#include <libucsi/endianops.h>
+
+/**
+ * Possible values for content_time_base_indicator.
+ */
+enum {
+ MPEG_CONTENT_TIME_BASE_STC = 0x01,
+ MPEG_CONTENT_TIME_BASE_NPT = 0x02,
+};
+
+/**
+ * mpeg_content_labelling_descriptor structure.
+ */
+struct mpeg_content_labelling_descriptor {
+ struct descriptor d;
+
+ uint16_t metadata_application_format;
+ /* struct mpeg_content_labelling_descriptor_application_format_identifier id */
+ /* struct mpeg_content_labelling_descriptor_flags flags */
+ /* struct mpeg_content_labelling_descriptor_reference_id reference_id */
+ /* struct mpeg_content_labelling_descriptor_time_base time_base */
+ /* struct mpeg_content_labelling_descriptor_content_id content_id */
+ /* struct mpeg_content_labelling_descriptor_time_base_association time_base_assoc */
+ /* uint8_t private_data[] */
+} __ucsi_packed;
+
+/**
+ * id field of a content_labelling_descriptor.
+ */
+struct mpeg_content_labelling_descriptor_application_format_identifier {
+ uint32_t id;
+} __ucsi_packed;
+
+/**
+ * Flags field of a content_labelling_descriptor
+ */
+struct mpeg_content_labelling_descriptor_flags {
+ EBIT3(uint8_t content_reference_id_record_flag : 1; ,
+ uint8_t content_time_base_indicator : 4; ,
+ uint8_t reserved : 3; );
+} __ucsi_packed;
+
+/**
+ * Reference_id field of a content_labelling_descriptor.
+ */
+struct mpeg_content_labelling_descriptor_reference_id {
+ uint8_t content_reference_id_record_length;
+ /* uint8_t data[] */
+} __ucsi_packed;
+
+/**
+ * time_base field of a content_labelling_descriptor.
+ */
+struct mpeg_content_labelling_descriptor_time_base {
+ EBIT2(uint64_t reserved_1 : 7; ,
+ uint64_t content_time_base_value :33; );
+ EBIT2(uint64_t reserved_2 : 7; ,
+ uint64_t metadata_time_base_value :33; );
+} __ucsi_packed;
+
+/**
+ * content_id field of a content_labelling_descriptor.
+ */
+struct mpeg_content_labelling_descriptor_content_id {
+ EBIT2(uint8_t reserved : 1; ,
+ uint8_t contentId : 7; );
+} __ucsi_packed;
+
+/**
+ * time_base_assoc field of a content_labelling_descriptor.
+ */
+struct mpeg_content_labelling_descriptor_time_base_association {
+ uint8_t time_base_association_data_length;
+ /* uint8_t data[] */
+} __ucsi_packed;
+
+
+
+/**
+ * Process an mpeg_content_labelling_descriptor.
+ *
+ * @param d Generic descriptor.
+ * @return Pointer to an mpeg_content_labelling_descriptor, or NULL on error.
+ */
+static inline struct mpeg_content_labelling_descriptor*
+ mpeg_content_labelling_descriptor_codec(struct descriptor* d)
+{
+ uint32_t pos = 2;
+ uint8_t *buf = (uint8_t*) d;
+ uint32_t len = d->len + 2;
+ struct mpeg_content_labelling_descriptor_flags *flags;
+ int id;
+
+ if (len < sizeof(struct mpeg_content_labelling_descriptor))
+ return NULL;
+
+ bswap16(buf + pos);
+ id = *((uint16_t*) (buf+pos));
+ pos += 2;
+
+ if (id == 0xffff) {
+ if (len < (pos+4))
+ return NULL;
+ bswap32(buf+pos);
+ pos += 4;
+ }
+
+ if (len < (pos + sizeof(struct mpeg_content_labelling_descriptor_flags)))
+ return NULL;
+ flags = (struct mpeg_content_labelling_descriptor_flags*) (buf+pos);
+ pos += sizeof(struct mpeg_content_labelling_descriptor_flags);
+
+ if (flags->content_reference_id_record_flag == 1) {
+ if (len < (pos+1))
+ return NULL;
+ if (len < (pos+1+buf[pos]))
+ return NULL;
+ pos += 1 + buf[pos];
+ }
+
+ if ((flags->content_time_base_indicator == 1) ||
+ (flags->content_time_base_indicator == 2)) {
+ if (len < (pos + sizeof(struct mpeg_content_labelling_descriptor_time_base)))
+ return NULL;
+ bswap40(buf+pos);
+ bswap40(buf+pos+5);
+ pos += sizeof(struct mpeg_content_labelling_descriptor_time_base);
+ }
+
+ if (flags->content_time_base_indicator == 2) {
+ if (len < (pos + sizeof(struct mpeg_content_labelling_descriptor_content_id)))
+ return NULL;
+ pos += sizeof(struct mpeg_content_labelling_descriptor_content_id);
+ }
+
+ if (flags->content_time_base_indicator > 2) {
+ if (len < (pos+1))
+ return NULL;
+ if (len < (pos+1+buf[pos]))
+ return NULL;
+ pos += 1 + buf[pos];
+ }
+
+ if (len < pos)
+ return NULL;
+
+ return (struct mpeg_content_labelling_descriptor*) d;
+}
+
+/**
+ * Accessor for pointer to id field of an mpeg_content_labelling_descriptor.
+ *
+ * @param d The mpeg_content_labelling_descriptor structure.
+ * @return The pointer, or NULL on error.
+ */
+static inline struct mpeg_content_labelling_descriptor_application_format_identifier*
+ mpeg_content_labelling_descriptor_id(struct mpeg_content_labelling_descriptor *d)
+{
+ uint8_t *buf = (uint8_t*) d;
+
+ if (d->metadata_application_format != 0xffff)
+ return NULL;
+ return (struct mpeg_content_labelling_descriptor_application_format_identifier*)
+ (buf + sizeof(struct mpeg_content_labelling_descriptor));
+}
+
+/**
+ * Accessor for pointer to flags field of an mpeg_content_labelling_descriptor.
+ *
+ * @param d The mpeg_content_labelling_descriptor structure.
+ * @return The pointer, or NULL on error.
+ */
+static inline struct mpeg_content_labelling_descriptor_flags*
+ mpeg_content_labelling_descriptor_flags(struct mpeg_content_labelling_descriptor *d)
+{
+ uint8_t *buf = (uint8_t*) d + sizeof(struct mpeg_content_labelling_descriptor);
+
+ if (d->metadata_application_format != 0xffff)
+ buf += 4;
+
+ return (struct mpeg_content_labelling_descriptor_flags *) buf;
+}
+
+/**
+ * Accessor for reference_id field of an mpeg_content_labelling_descriptor.
+ *
+ * @param flags Pointer to the mpeg_content_labelling_descriptor_flags.
+ * @return Pointer to the field, or NULL on error.
+ */
+static inline struct mpeg_content_labelling_descriptor_reference_id*
+ mpeg_content_labelling_descriptor_reference_id(struct mpeg_content_labelling_descriptor_flags *flags)
+{
+ uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_content_labelling_descriptor_flags);
+
+ if (flags->content_reference_id_record_flag != 1)
+ return NULL;
+
+ return (struct mpeg_content_labelling_descriptor_reference_id *) buf;
+}
+
+/**
+ * Accessor for data field of an mpeg_content_reference_id.
+ *
+ * @param d The mpeg_content_reference_id structure.
+ * @return Pointer to the field.
+ */
+static inline uint8_t*
+ mpeg_content_reference_id_data(struct mpeg_content_labelling_descriptor_reference_id *d)
+{
+ return (uint8_t*) d + sizeof(struct mpeg_content_labelling_descriptor_reference_id);
+}
+
+/**
+ * Accessor for time_base field of an mpeg_content_labelling_descriptor.
+ *
+ * @param flags Pointer to the mpeg_content_labelling_descriptor_flags.
+ * @return Pointer to the field, or NULL on error.
+ */
+static inline struct mpeg_content_labelling_descriptor_time_base*
+ mpeg_content_labelling_descriptor_time_base(struct mpeg_content_labelling_descriptor_flags *flags)
+{
+ uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_content_labelling_descriptor_flags);
+
+ if ((flags->content_time_base_indicator!=1) && (flags->content_time_base_indicator!=2))
+ return NULL;
+
+ if (flags->content_reference_id_record_flag == 1)
+ buf += 1 + buf[1];
+
+ return (struct mpeg_content_labelling_descriptor_time_base *) buf;
+}
+
+/**
+ * Accessor for content_id field of an mpeg_content_labelling_descriptor.
+ *
+ * @param flags Pointer to the mpeg_content_labelling_descriptor_flags.
+ * @return Pointer to the field, or NULL on error.
+ */
+static inline struct mpeg_content_labelling_descriptor_content_id*
+ mpeg_content_labelling_descriptor_content_id(struct mpeg_content_labelling_descriptor_flags *flags)
+{
+ uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_content_labelling_descriptor_flags);
+
+ if (flags->content_time_base_indicator!=2)
+ return NULL;
+
+ if (flags->content_reference_id_record_flag == 1)
+ buf += 1 + buf[1];
+ if ((flags->content_time_base_indicator==1) || (flags->content_time_base_indicator==2))
+ buf += sizeof(struct mpeg_content_labelling_descriptor_time_base);
+
+ return (struct mpeg_content_labelling_descriptor_content_id *) buf;
+}
+
+/**
+ * Accessor for time_base_association field of an mpeg_content_labelling_descriptor.
+ *
+ * @param flags Pointer to the mpeg_content_labelling_descriptor_flags.
+ * @return Pointer to the field, or NULL on error.
+ */
+static inline struct mpeg_content_labelling_descriptor_time_base_association*
+ mpeg_content_labelling_descriptor_time_base_assoc(struct mpeg_content_labelling_descriptor_flags *flags)
+{
+ uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_content_labelling_descriptor_flags);
+
+ if (flags->content_time_base_indicator<3)
+ return NULL;
+
+ if (flags->content_reference_id_record_flag == 1)
+ buf += 1 + buf[1];
+ if ((flags->content_time_base_indicator==1) || (flags->content_time_base_indicator==2))
+ buf += sizeof(struct mpeg_content_labelling_descriptor_time_base);
+ if (flags->content_time_base_indicator==2)
+ buf += sizeof(struct mpeg_content_labelling_descriptor_content_id);
+
+ return (struct mpeg_content_labelling_descriptor_time_base_association *) buf;
+}
+
+/**
+ * Accessor for data field of an mpeg_time_base_association.
+ *
+ * @param d The mpeg_time_base_association structure.
+ * @return Pointer to the field.
+ */
+static inline uint8_t*
+ mpeg_time_base_association_data(struct mpeg_content_labelling_descriptor_time_base_association *d)
+{
+ return (uint8_t*) d + sizeof(struct mpeg_content_labelling_descriptor_time_base_association);
+}
+
+
+/**
+ * Accessor for private_data field of an mpeg_content_labelling_descriptor.
+ *
+ * @param d The mpeg_content_labelling_descriptor structure.
+ * @param flags Pointer to the mpeg_content_labelling_descriptor_flags.
+ * @param length Where the number of bytes in the field should be stored.
+ * @return Pointer to the field.
+ */
+static inline uint8_t*
+ mpeg_content_labelling_descriptor_data(struct mpeg_content_labelling_descriptor *d,
+ struct mpeg_content_labelling_descriptor_flags *flags,
+ int *length)
+{
+ uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_content_labelling_descriptor_flags);
+ uint8_t *end = (uint8_t*) d + d->d.len + 2;
+
+ if (flags->content_reference_id_record_flag == 1)
+ buf += 1 + buf[1];
+ if ((flags->content_time_base_indicator==1) || (flags->content_time_base_indicator==2))
+ buf += sizeof(struct mpeg_content_labelling_descriptor_time_base);
+ if (flags->content_time_base_indicator==2)
+ buf += sizeof(struct mpeg_content_labelling_descriptor_content_id);
+ if (flags->content_time_base_indicator<3)
+ buf += 1 + buf[1];
+
+ *length = end - buf;
+
+ return buf;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif