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Diffstat (limited to '')
| -rw-r--r-- | lib/libucsi/mpeg/content_labelling_descriptor.h | 356 |
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 new file mode 100644 index 0000000..06738ab --- /dev/null +++ b/lib/libucsi/mpeg/content_labelling_descriptor.h @@ -0,0 +1,356 @@ +/* + * 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 |