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361 lines
10 KiB
361 lines
10 KiB
/*
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* section and descriptor parser
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*
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* Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
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* Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef _UCSI_MPEG_METADATA_POINTER_DESCRIPTOR
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#define _UCSI_MPEG_METADATA_POINTER_DESCRIPTOR 1
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#include <libucsi/descriptor.h>
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#include <libucsi/endianops.h>
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/**
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* Possible values for the mpeg_carriage_flags field.
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*/
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enum {
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MPEG_CARRIAGE_SAME_TS = 0x00,
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MPEG_CARRIAGE_DIFFERENT_TS = 0x01,
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MPEG_CARRIAGE_PS = 0x02,
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MPEG_CARRIAGE_OTHER = 0x03,
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};
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/**
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* mpeg_metadata_pointer_descriptor structure.
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*/
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struct mpeg_metadata_pointer_descriptor {
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struct descriptor d;
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uint16_t metadata_application_format;
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/* struct mpeg_metadata_pointer_descriptor_application_format_identifier appid */
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/* uint8_t metadata_format */
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/* struct mpeg_metadata_pointer_descriptor_format_identifier formid */
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/* struct mpeg_metadata_pointer_descriptor_flags flags */
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/* struct mpeg_metadata_pointer_descriptor_locator locator */
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/* struct mpeg_metadata_pointer_descriptor_program_number program_number */
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/* struct mpeg_metadata_pointer_descriptor_carriage carriage */
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/* uint8_t private_data[] */
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} __ucsi_packed;
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/**
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* appid field of a metadata_pointer_descriptor.
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*/
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struct mpeg_metadata_pointer_descriptor_application_format_identifier {
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uint32_t id;
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} __ucsi_packed;
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/**
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* formid field of a metadata_pointer_descriptor.
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*/
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struct mpeg_metadata_pointer_descriptor_format_identifier {
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uint32_t id;
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} __ucsi_packed;
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/**
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* Flags field of a metadata_pointer_descriptor
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*/
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struct mpeg_metadata_pointer_descriptor_flags {
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uint8_t metadata_service_id;
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EBIT3(uint8_t metadata_locator_record_flag : 1; ,
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uint8_t mpeg_carriage_flags : 2; ,
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uint8_t reserved : 5; );
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} __ucsi_packed;
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/**
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* Reference_id field of a metadata_pointer_descriptor.
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*/
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struct mpeg_metadata_pointer_descriptor_locator {
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uint8_t metadata_locator_record_length;
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/* uint8_t data[] */
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} __ucsi_packed;
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/**
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* program_number field of a metadata_pointer_descriptor.
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*/
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struct mpeg_metadata_pointer_descriptor_program_number {
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uint16_t number;
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} __ucsi_packed;
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/**
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* carriage field of a metadata_pointer_descriptor.
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*/
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struct mpeg_metadata_pointer_descriptor_carriage {
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uint16_t transport_stream_location;
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uint16_t transport_stream_id;
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} __ucsi_packed;
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/**
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* Process an mpeg_metadata_pointer_descriptor.
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*
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* @param d Generic descriptor.
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* @return Pointer to an mpeg_metadata_pointer_descriptor, or NULL on error.
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*/
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static inline struct mpeg_metadata_pointer_descriptor*
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mpeg_metadata_pointer_descriptor_codec(struct descriptor* d)
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{
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uint32_t pos = 2;
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uint8_t *buf = (uint8_t*) d;
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uint32_t len = d->len + 2;
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struct mpeg_metadata_pointer_descriptor_flags *flags;
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int id;
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if (len < sizeof(struct mpeg_metadata_pointer_descriptor))
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return NULL;
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bswap16(buf + pos);
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id = *((uint16_t*) (buf+pos));
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pos += 2;
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if (id == 0xffff) {
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if (len < (pos+4))
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return NULL;
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bswap32(buf+pos);
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pos += 4;
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}
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if (len < (pos+1))
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return NULL;
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id = buf[pos];
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pos++;
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if (id == 0xff) {
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if (len < (pos+4))
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return NULL;
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bswap32(buf+pos);
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pos += 4;
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}
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if (len < (pos + sizeof(struct mpeg_metadata_pointer_descriptor_flags)))
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return NULL;
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flags = (struct mpeg_metadata_pointer_descriptor_flags*) (buf+pos);
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pos += sizeof(struct mpeg_metadata_pointer_descriptor_flags);
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if (flags->metadata_locator_record_flag == 1) {
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if (len < (pos+1))
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return NULL;
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if (len < (pos+1+buf[pos]))
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return NULL;
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pos += 1 + buf[pos];
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}
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if (flags->mpeg_carriage_flags < 3) {
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if (len < (pos + 2))
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return NULL;
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bswap16(buf+pos);
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pos += 2;
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}
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if (flags->mpeg_carriage_flags == 1) {
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if (len < (pos + 4))
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return NULL;
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bswap16(buf+pos);
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bswap16(buf+pos+2);
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pos += 4;
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}
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if (len < pos)
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return NULL;
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return (struct mpeg_metadata_pointer_descriptor*) d;
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}
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/**
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* Accessor for pointer to appid field of an mpeg_metadata_pointer_descriptor.
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*
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* @param d The mpeg_metadata_pointer_descriptor structure.
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* @return The pointer, or NULL on error.
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*/
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static inline struct mpeg_metadata_pointer_descriptor_application_format_identifier*
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mpeg_metadata_pointer_descriptor_appid(struct mpeg_metadata_pointer_descriptor *d)
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{
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uint8_t *buf = (uint8_t*) d + sizeof(struct mpeg_metadata_pointer_descriptor);
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if (d->metadata_application_format != 0xffff)
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return NULL;
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return (struct mpeg_metadata_pointer_descriptor_application_format_identifier*) buf;
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}
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/**
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* Accessor for metadata_format field of an mpeg_metadata_pointer_descriptor.
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*
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* @param d The mpeg_metadata_pointer_descriptor structure.
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* @return The pointer, or NULL on error.
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*/
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static inline uint8_t
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mpeg_metadata_pointer_descriptor_metadata_format(struct mpeg_metadata_pointer_descriptor *d)
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{
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uint8_t *buf = (uint8_t*) d + sizeof(struct mpeg_metadata_pointer_descriptor);
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if (d->metadata_application_format == 0xffff)
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buf+=4;
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return *buf;
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}
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/**
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* Accessor for pointer to formid field of an mpeg_metadata_pointer_descriptor.
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*
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* @param d The mpeg_metadata_pointer_descriptor structure.
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* @return The pointer, or NULL on error.
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*/
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static inline struct mpeg_metadata_pointer_descriptor_format_identifier*
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mpeg_metadata_pointer_descriptor_formid(struct mpeg_metadata_pointer_descriptor *d)
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{
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uint8_t *buf = (uint8_t*) d + sizeof(struct mpeg_metadata_pointer_descriptor);
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if (d->metadata_application_format == 0xffff)
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buf+=4;
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if (*buf != 0xff)
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return NULL;
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return (struct mpeg_metadata_pointer_descriptor_format_identifier*) (buf+1);
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}
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/**
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* Accessor for flags field of an mpeg_metadata_pointer_descriptor.
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*
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* @param d The mpeg_metadata_pointer_descriptor structure.
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* @return Pointer to the field, or NULL on error.
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*/
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static inline struct mpeg_metadata_pointer_descriptor_flags*
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mpeg_metadata_pointer_descriptor_flags(struct mpeg_metadata_pointer_descriptor *d)
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{
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uint8_t *buf = (uint8_t*) d + sizeof(struct mpeg_metadata_pointer_descriptor);
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if (d->metadata_application_format == 0xffff)
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buf+=4;
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if (*buf == 0xff)
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buf+=4;
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return (struct mpeg_metadata_pointer_descriptor_flags*) buf;
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}
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/**
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* Accessor for locator field of an mpeg_metadata_pointer_descriptor.
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*
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* @param flags Pointer to the mpeg_metadata_pointer_descriptor_flags.
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* @return Pointer to the field, or NULL on error.
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*/
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static inline struct mpeg_metadata_pointer_descriptor_locator*
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mpeg_metadata_pointer_descriptor_locator(struct mpeg_metadata_pointer_descriptor_flags *flags)
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{
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uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_metadata_pointer_descriptor_flags);
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if (flags->metadata_locator_record_flag!=1)
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return NULL;
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return (struct mpeg_metadata_pointer_descriptor_locator *) buf;
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}
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/**
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* Accessor for data field of an mpeg_metadata_pointer_descriptor_locator.
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*
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* @param d The mpeg_metadata_pointer_descriptor_locator structure.
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* @return Pointer to the field.
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*/
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static inline uint8_t*
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mpeg_metadata_pointer_descriptor_locator_data(struct mpeg_metadata_pointer_descriptor_locator *d)
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{
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return (uint8_t*) d + sizeof(struct mpeg_metadata_pointer_descriptor_locator);
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}
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/**
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* Accessor for program_number field of an mpeg_metadata_pointer_descriptor.
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*
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* @param flags Pointer to the mpeg_metadata_pointer_descriptor_flags.
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* @return Pointer to the field, or NULL on error.
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*/
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static inline struct mpeg_metadata_pointer_descriptor_program_number*
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mpeg_metadata_pointer_descriptor_program_number(struct mpeg_metadata_pointer_descriptor_flags *flags)
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{
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uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_metadata_pointer_descriptor_flags);
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if (flags->mpeg_carriage_flags < 3)
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return NULL;
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if (flags->metadata_locator_record_flag==1)
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buf += 1 + buf[1];
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return (struct mpeg_metadata_pointer_descriptor_program_number*) buf;
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}
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/**
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* Accessor for carriage field of an mpeg_metadata_pointer_descriptor.
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*
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* @param flags Pointer to the mpeg_metadata_pointer_descriptor_flags.
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* @return Pointer to the field, or NULL on error.
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*/
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static inline struct mpeg_metadata_pointer_descriptor_carriage*
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mpeg_metadata_pointer_descriptor_carriage(struct mpeg_metadata_pointer_descriptor_flags *flags)
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{
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uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_metadata_pointer_descriptor_flags);
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if (flags->mpeg_carriage_flags != 1)
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return NULL;
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if (flags->metadata_locator_record_flag==1)
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buf += 1 + buf[1];
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if (flags->mpeg_carriage_flags < 3)
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buf += sizeof(struct mpeg_metadata_pointer_descriptor_program_number);
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return (struct mpeg_metadata_pointer_descriptor_carriage *) buf;
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}
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/**
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* Accessor for private_data field of an mpeg_metadata_pointer_descriptor.
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*
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* @param d The mpeg_metadata_pointer_descriptor structure.
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* @param flags Pointer to the mpeg_metadata_pointer_descriptor_flags.
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* @param length Where the number of bytes in the field should be stored.
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* @return Pointer to the field.
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*/
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static inline uint8_t*
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mpeg_metadata_pointer_descriptor_private_data(struct mpeg_metadata_pointer_descriptor *d,
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struct mpeg_metadata_pointer_descriptor_flags *flags,
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int *length)
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{
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uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_metadata_pointer_descriptor_flags);
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uint8_t *end = (uint8_t*) d + d->d.len + 2;
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if (flags->metadata_locator_record_flag==1)
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buf += 1 + buf[1];
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if (flags->mpeg_carriage_flags < 3)
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buf += sizeof(struct mpeg_metadata_pointer_descriptor_program_number);
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if (flags->mpeg_carriage_flags != 1)
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buf += sizeof(struct mpeg_metadata_pointer_descriptor_carriage);
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*length = end - buf;
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return buf;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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