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 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  * This file contains the logic to work with MPEG Program-Specific Information.
  * These are defined both in ISO/IEC 13818-1 (systems) and ETSI EN 300 468.
  * PSI is carried in the form of table structures, and although each table might
  * technically be broken into one or more sections, we do not do this here,
  * hence 'table' and 'section' are interchangeable for vidtv.
  *
  * Copyright (C) 2020 Daniel W. S. Almeida
  */
 
 #ifndef VIDTV_PSI_H
 #define VIDTV_PSI_H
 
 #include <linux/types.h>
 
 /*
  * all section lengths start immediately after the 'section_length' field
  * see ISO/IEC 13818-1 : 2000 and ETSI EN 300 468 V 1.10.1 for
  * reference
  */
 #define PAT_LEN_UNTIL_LAST_SECTION_NUMBER 5
 #define PMT_LEN_UNTIL_PROGRAM_INFO_LENGTH 9
 #define SDT_LEN_UNTIL_RESERVED_FOR_FUTURE_USE 8
 #define NIT_LEN_UNTIL_NETWORK_DESCRIPTOR_LEN 7
 #define EIT_LEN_UNTIL_LAST_TABLE_ID 11
 #define MAX_SECTION_LEN 1021
 #define EIT_MAX_SECTION_LEN 4093 /* see ETSI 300 468 v.1.10.1 p. 26 */
 #define VIDTV_PAT_PID 0 /* mandated by the specs */
 #define VIDTV_SDT_PID 0x0011 /* mandated by the specs */
 #define VIDTV_NIT_PID 0x0010 /* mandated by the specs */
 #define VIDTV_EIT_PID 0x0012 /*mandated by the specs */
 
 enum vidtv_psi_descriptors {
     REGISTRATION_DESCRIPTOR = 0x05, /* See ISO/IEC 13818-1 section 2.6.8 */
     NETWORK_NAME_DESCRIPTOR = 0x40, /* See ETSI EN 300 468 section 6.2.27 */
     SERVICE_LIST_DESCRIPTOR = 0x41, /* See ETSI EN 300 468 section 6.2.35 */
     SERVICE_DESCRIPTOR = 0x48, /* See ETSI EN 300 468 section 6.2.33 */
     SHORT_EVENT_DESCRIPTOR = 0x4d, /* See ETSI EN 300 468 section 6.2.37 */
 };
 
 enum vidtv_psi_stream_types {
     STREAM_PRIVATE_DATA = 0x06, /* see ISO/IEC 13818-1 2000 p. 48 */
 };
 
 /*
  * struct vidtv_psi_desc - A generic PSI descriptor type.
  * The descriptor length is an 8-bit field specifying the total number of bytes of the data portion
  * of the descriptor following the byte defining the value of this field.
  */
 struct vidtv_psi_desc {
     struct vidtv_psi_desc *next;
     u8 type;
     u8 length;
     u8 data[];
 } __packed;
 
 /*
  * struct vidtv_psi_desc_service - Service descriptor.
  * See ETSI EN 300 468 section 6.2.33.
  */
 struct vidtv_psi_desc_service {
     struct vidtv_psi_desc *next;
     u8 type;
     u8 length;
 
     u8 service_type;
     u8 provider_name_len;
     char *provider_name;
     u8 service_name_len;
     char *service_name;
 } __packed;
 
 /*
  * struct vidtv_psi_desc_registration - A registration descriptor.
  * See ISO/IEC 13818-1 section 2.6.8
  */
 struct vidtv_psi_desc_registration {
     struct vidtv_psi_desc *next;
     u8 type;
     u8 length;
 
     /*
      * The format_identifier is a 32-bit value obtained from a Registration
      * Authority as designated by ISO/IEC JTC 1/SC 29.
      */
     __be32 format_id;
     /*
      * The meaning of additional_identification_info bytes, if any, are
      * defined by the assignee of that format_identifier, and once defined
      * they shall not change.
      */
     u8 additional_identification_info[];
 } __packed;
 
 /*
  * struct vidtv_psi_desc_network_name - A network name descriptor
  * see ETSI EN 300 468 v1.15.1 section 6.2.27
  */
 struct vidtv_psi_desc_network_name {
     struct vidtv_psi_desc *next;
     u8 type;
     u8 length;
     char *network_name;
 } __packed;
 
 struct vidtv_psi_desc_service_list_entry {
     __be16 service_id;
     u8 service_type;
     struct vidtv_psi_desc_service_list_entry *next;
 } __packed;
 
 /*
  * struct vidtv_psi_desc_service_list - A service list descriptor
  * see ETSI EN 300 468 v1.15.1 section 6.2.35
  */
 struct vidtv_psi_desc_service_list {
     struct vidtv_psi_desc *next;
     u8 type;
     u8 length;
     struct vidtv_psi_desc_service_list_entry *service_list;
 } __packed;
 
 /*
  * struct vidtv_psi_desc_short_event - A short event descriptor
  * see ETSI EN 300 468 v1.15.1 section 6.2.37
  */
 struct vidtv_psi_desc_short_event {
     struct vidtv_psi_desc *next;
     u8 type;
     u8 length;
     char *iso_language_code;
     u8 event_name_len;
     char *event_name;
     u8 text_len;
     char *text;
 } __packed;
 
 struct vidtv_psi_desc_short_event
 *vidtv_psi_short_event_desc_init(struct vidtv_psi_desc *head,
                  char *iso_language_code,
                  char *event_name,
                  char *text);
 
 /*
  * struct vidtv_psi_table_header - A header that is present for all PSI tables.
  */
 struct vidtv_psi_table_header {
     u8  table_id;
 
     __be16 bitfield; /* syntax: 1, zero: 1, one: 2, section_length: 13 */
 
     __be16 id; /* TS ID */
     u8  current_next:1;
     u8  version:5;
     u8  one2:2;
     u8  section_id; /* section_number */
     u8  last_section; /* last_section_number */
 } __packed;
 
 /*
  * struct vidtv_psi_table_pat_program - A single program in the PAT
  * See ISO/IEC 13818-1 : 2000 p.43
  */
 struct vidtv_psi_table_pat_program {
     __be16 service_id;
     __be16 bitfield; /* reserved: 3, program_map_pid/network_pid: 13 */
     struct vidtv_psi_table_pat_program *next;
 } __packed;
 
 /*
  * struct vidtv_psi_table_pat - The Program Allocation Table (PAT)
  * See ISO/IEC 13818-1 : 2000 p.43
  */
 struct vidtv_psi_table_pat {
     struct vidtv_psi_table_header header;
     u16 num_pat;
     u16 num_pmt;
     struct vidtv_psi_table_pat_program *program;
 } __packed;
 
 /*
  * struct vidtv_psi_table_sdt_service - Represents a service in the SDT.
  * see ETSI EN 300 468 v1.15.1 section 5.2.3.
  */
 struct vidtv_psi_table_sdt_service {
     __be16 service_id;
     u8 EIT_present_following:1;
     u8 EIT_schedule:1;
     u8 reserved:6;
     __be16 bitfield; /* running_status: 3, free_ca:1, desc_loop_len:12 */
     struct vidtv_psi_desc *descriptor;
     struct vidtv_psi_table_sdt_service *next;
 } __packed;
 
 /*
  * struct vidtv_psi_table_sdt - Represents the Service Description Table
  * see ETSI EN 300 468 v1.15.1 section 5.2.3.
  */
 
 struct vidtv_psi_table_sdt {
     struct vidtv_psi_table_header header;
     __be16 network_id; /* original_network_id */
     u8  reserved;
     struct vidtv_psi_table_sdt_service *service;
 } __packed;
 
 /*
  * enum service_running_status - Status of a SDT service.
  * see ETSI EN 300 468 v1.15.1 section 5.2.3 table 6.
  */
 enum service_running_status {
     RUNNING = 0x4,
 };
 
 /*
  * enum service_type - The type of a SDT service.
  * see ETSI EN 300 468 v1.15.1 section 6.2.33, table 81.
  */
 enum service_type {
     /* see ETSI EN 300 468 v1.15.1 p. 77 */
     DIGITAL_TELEVISION_SERVICE = 0x1,
     DIGITAL_RADIO_SOUND_SERVICE = 0X2,
 };
 
 /*
  * struct vidtv_psi_table_pmt_stream - A single stream in the PMT.
  * See ISO/IEC 13818-1 : 2000 p.46.
  */
 struct vidtv_psi_table_pmt_stream {
     u8 type;
     __be16 bitfield; /* reserved: 3, elementary_pid: 13 */
     __be16 bitfield2; /*reserved: 4, zero: 2, desc_length: 10 */
     struct vidtv_psi_desc *descriptor;
     struct vidtv_psi_table_pmt_stream *next;
 } __packed;
 
 /*
  * struct vidtv_psi_table_pmt - The Program Map Table (PMT).
  * See ISO/IEC 13818-1 : 2000 p.46.
  */
 struct vidtv_psi_table_pmt {
     struct vidtv_psi_table_header header;
     __be16 bitfield; /* reserved:3, pcr_pid: 13 */
     __be16 bitfield2; /* reserved: 4, zero: 2, desc_len: 10 */
     struct vidtv_psi_desc *descriptor;
     struct vidtv_psi_table_pmt_stream *stream;
 } __packed;
 
 /**
  * struct psi_write_args - Arguments for the PSI packetizer.
  * @dest_buf: The buffer to write into.
  * @from: PSI data to be copied.
  * @len: How much to write.
  * @dest_offset: where to start writing in the dest_buffer.
  * @pid: TS packet ID.
  * @new_psi_section: Set when starting a table section.
  * @continuity_counter: Incremented on every new packet.
  * @is_crc: Set when writing the CRC at the end.
  * @dest_buf_sz: The size of the dest_buffer
  * @crc: a pointer to store the crc for this chunk
  */
 struct psi_write_args {
     void *dest_buf;
     void *from;
     size_t len;
     u32 dest_offset;
     u16 pid;
     bool new_psi_section;
     u8 *continuity_counter;
     bool is_crc;
     u32 dest_buf_sz;
     u32 *crc;
 };
 
 /**
  * struct desc_write_args - Arguments in order to write a descriptor.
  * @dest_buf: The buffer to write into.
  * @dest_offset: where to start writing in the dest_buffer.
  * @desc: A pointer to the descriptor
  * @pid: TS packet ID.
  * @continuity_counter: Incremented on every new packet.
  * @dest_buf_sz: The size of the dest_buffer
  * @crc: a pointer to store the crc for this chunk
  */
 struct desc_write_args {
     void *dest_buf;
     u32 dest_offset;
     struct vidtv_psi_desc *desc;
     u16 pid;
     u8 *continuity_counter;
     u32 dest_buf_sz;
     u32 *crc;
 };
 
 /**
  * struct crc32_write_args - Arguments in order to write the CRC at the end of
  * the PSI tables.
  * @dest_buf: The buffer to write into.
  * @dest_offset: where to start writing in the dest_buffer.
  * @crc: the CRC value to write
  * @pid: TS packet ID.
  * @continuity_counter: Incremented on every new packet.
  * @dest_buf_sz: The size of the dest_buffer
  */
 struct crc32_write_args {
     void *dest_buf;
     u32 dest_offset;
     __be32 crc;
     u16 pid;
     u8 *continuity_counter;
     u32 dest_buf_sz;
 };
 
 /**
  * struct header_write_args - Arguments in order to write the common table
  * header
  * @dest_buf: The buffer to write into.
  * @dest_offset: where to start writing in the dest_buffer.
  * @h: a pointer to the header.
  * @pid: TS packet ID.
  * @continuity_counter: Incremented on every new packet.
  * @dest_buf_sz: The size of the dest_buffer
  * @crc: a pointer to store the crc for this chunk
  */
 struct header_write_args {
     void *dest_buf;
     u32 dest_offset;
     struct vidtv_psi_table_header *h;
     u16 pid;
     u8 *continuity_counter;
     u32 dest_buf_sz;
     u32 *crc;
 };
 
 struct vidtv_psi_desc_service *vidtv_psi_service_desc_init(struct vidtv_psi_desc *head,
                                enum service_type service_type,
                                char *service_name,
                                char *provider_name);
 
 struct vidtv_psi_desc_registration
 *vidtv_psi_registration_desc_init(struct vidtv_psi_desc *head,
                   __be32 format_id,
                   u8 *additional_ident_info,
                   u32 additional_info_len);
 
 struct vidtv_psi_desc_network_name
 *vidtv_psi_network_name_desc_init(struct vidtv_psi_desc *head, char *network_name);
 
 struct vidtv_psi_desc_service_list
 *vidtv_psi_service_list_desc_init(struct vidtv_psi_desc *head,
                   struct vidtv_psi_desc_service_list_entry *entry);
 
 struct vidtv_psi_table_pat_program
 *vidtv_psi_pat_program_init(struct vidtv_psi_table_pat_program *head,
                 u16 service_id,
                 u16 program_map_pid);
 
 struct vidtv_psi_table_pmt_stream*
 vidtv_psi_pmt_stream_init(struct vidtv_psi_table_pmt_stream *head,
               enum vidtv_psi_stream_types stream_type,
               u16 es_pid);
 
 struct vidtv_psi_table_pat *vidtv_psi_pat_table_init(u16 transport_stream_id);
 
 struct vidtv_psi_table_pmt *vidtv_psi_pmt_table_init(u16 program_number,
                              u16 pcr_pid);
 
 struct vidtv_psi_table_sdt *vidtv_psi_sdt_table_init(u16 network_id,
                              u16 transport_stream_id);
 
 struct vidtv_psi_table_sdt_service*
 vidtv_psi_sdt_service_init(struct vidtv_psi_table_sdt_service *head,
                u16 service_id,
                bool eit_schedule,
                bool eit_present_following);
 
 void
 vidtv_psi_desc_destroy(struct vidtv_psi_desc *desc);
 
 void
 vidtv_psi_pat_program_destroy(struct vidtv_psi_table_pat_program *p);
 
 void
 vidtv_psi_pat_table_destroy(struct vidtv_psi_table_pat *p);
 
 void
 vidtv_psi_pmt_stream_destroy(struct vidtv_psi_table_pmt_stream *s);
 
 void
 vidtv_psi_pmt_table_destroy(struct vidtv_psi_table_pmt *pmt);
 
 void
 vidtv_psi_sdt_table_destroy(struct vidtv_psi_table_sdt *sdt);
 
 void
 vidtv_psi_sdt_service_destroy(struct vidtv_psi_table_sdt_service *service);
 
 /**
  * vidtv_psi_sdt_service_assign - Assigns the service loop to the SDT.
  * @sdt: The SDT to assign to.
  * @service: The service loop (one or more services)
  *
  * This will free the previous service loop in the table.
  * This will assign ownership of the service loop to the table, i.e. the table
  * will free this service loop when a call to its destroy function is made.
  */
 void
 vidtv_psi_sdt_service_assign(struct vidtv_psi_table_sdt *sdt,
                  struct vidtv_psi_table_sdt_service *service);
 
 /**
  * vidtv_psi_desc_assign - Assigns a descriptor loop at some point
  * @to: Where to assign this descriptor loop to
  * @desc: The descriptor loop that will be assigned.
  *
  * This will free the loop in 'to', if any.
  */
 void vidtv_psi_desc_assign(struct vidtv_psi_desc **to,
                struct vidtv_psi_desc *desc);
 
 /**
  * vidtv_pmt_desc_assign - Assigns a descriptor loop at some point in a PMT section.
  * @pmt: The PMT section that will contain the descriptor loop
  * @to: Where in the PMT to assign this descriptor loop to
  * @desc: The descriptor loop that will be assigned.
  *
  * This will free the loop in 'to', if any.
  * This will assign ownership of the loop to the table, i.e. the table
  * will free this loop when a call to its destroy function is made.
  */
 void vidtv_pmt_desc_assign(struct vidtv_psi_table_pmt *pmt,
                struct vidtv_psi_desc **to,
                struct vidtv_psi_desc *desc);
 
 /**
  * vidtv_sdt_desc_assign - Assigns a descriptor loop at some point in a SDT.
  * @sdt: The SDT that will contain the descriptor loop
  * @to: Where in the PMT to assign this descriptor loop to
  * @desc: The descriptor loop that will be assigned.
  *
  * This will free the loop in 'to', if any.
  * This will assign ownership of the loop to the table, i.e. the table
  * will free this loop when a call to its destroy function is made.
  */
 void vidtv_sdt_desc_assign(struct vidtv_psi_table_sdt *sdt,
                struct vidtv_psi_desc **to,
                struct vidtv_psi_desc *desc);
 
 /**
  * vidtv_psi_pat_program_assign - Assigns the program loop to the PAT.
  * @pat: The PAT to assign to.
  * @p: The program loop (one or more programs)
  *
  * This will free the previous program loop in the table.
  * This will assign ownership of the program loop to the table, i.e. the table
  * will free this program loop when a call to its destroy function is made.
  */
 void vidtv_psi_pat_program_assign(struct vidtv_psi_table_pat *pat,
                   struct vidtv_psi_table_pat_program *p);
 
 /**
  * vidtv_psi_pmt_stream_assign - Assigns the stream loop to the PAT.
  * @pmt: The PMT to assign to.
  * @s: The stream loop (one or more streams)
  *
  * This will free the previous stream loop in the table.
  * This will assign ownership of the stream loop to the table, i.e. the table
  * will free this stream loop when a call to its destroy function is made.
  */
 void vidtv_psi_pmt_stream_assign(struct vidtv_psi_table_pmt *pmt,
                  struct vidtv_psi_table_pmt_stream *s);
 
 struct vidtv_psi_desc *vidtv_psi_desc_clone(struct vidtv_psi_desc *desc);
 
 /**
  * vidtv_psi_pmt_create_sec_for_each_pat_entry - Create a PMT section for each
  * program found in the PAT
  * @pat: The PAT to look for programs.
  * @pcr_pid: packet ID for the PCR to be used for the program described in this
  * PMT section
  */
 struct vidtv_psi_table_pmt**
 vidtv_psi_pmt_create_sec_for_each_pat_entry(struct vidtv_psi_table_pat *pat, u16 pcr_pid);
 
 /**
  * vidtv_psi_pmt_get_pid - Get the TS PID for a PMT section.
  * @section: The PMT section whose PID we want to retrieve.
  * @pat: The PAT table to look into.
  *
  * Returns: the TS PID for 'section'
  */
 u16 vidtv_psi_pmt_get_pid(struct vidtv_psi_table_pmt *section,
               struct vidtv_psi_table_pat *pat);
 
 /**
  * vidtv_psi_pat_table_update_sec_len - Recompute and update the PAT section length.
  * @pat: The PAT whose length is to be updated.
  *
  * This will traverse the table and accumulate the length of its components,
  * which is then used to replace the 'section_length' field.
  *
  * If section_length > MAX_SECTION_LEN, the operation fails.
  */
 void vidtv_psi_pat_table_update_sec_len(struct vidtv_psi_table_pat *pat);
 
 /**
  * vidtv_psi_pmt_table_update_sec_len - Recompute and update the PMT section length.
  * @pmt: The PMT whose length is to be updated.
  *
  * This will traverse the table and accumulate the length of its components,
  * which is then used to replace the 'section_length' field.
  *
  * If section_length > MAX_SECTION_LEN, the operation fails.
  */
 void vidtv_psi_pmt_table_update_sec_len(struct vidtv_psi_table_pmt *pmt);
 
 /**
  * vidtv_psi_sdt_table_update_sec_len - Recompute and update the SDT section length.
  * @sdt: The SDT whose length is to be updated.
  *
  * This will traverse the table and accumulate the length of its components,
  * which is then used to replace the 'section_length' field.
  *
  * If section_length > MAX_SECTION_LEN, the operation fails.
  */
 void vidtv_psi_sdt_table_update_sec_len(struct vidtv_psi_table_sdt *sdt);
 
 /**
  * struct vidtv_psi_pat_write_args - Arguments for writing a PAT table
  * @buf: The destination buffer.
  * @offset: The offset into the destination buffer.
  * @pat: A pointer to the PAT.
  * @buf_sz: The size of the destination buffer.
  * @continuity_counter: A pointer to the CC. Incremented on every new packet.
  *
  */
 struct vidtv_psi_pat_write_args {
     char *buf;
     u32 offset;
     struct vidtv_psi_table_pat *pat;
     u32 buf_sz;
     u8 *continuity_counter;
 };
 
 /**
  * vidtv_psi_pat_write_into - Write PAT as MPEG-TS packets into a buffer.
  * @args: An instance of struct vidtv_psi_pat_write_args
  *
  * This function writes the MPEG TS packets for a PAT table into a buffer.
  * Calling code will usually generate the PAT via a call to its init function
  * and thus is responsible for freeing it.
  *
  * Return: The number of bytes written into the buffer. This is NOT
  * equal to the size of the PAT, since more space is needed for TS headers during TS
  * encapsulation.
  */
 u32 vidtv_psi_pat_write_into(struct vidtv_psi_pat_write_args *args);
 
 /**
  * struct vidtv_psi_sdt_write_args - Arguments for writing a SDT table
  * @buf: The destination buffer.
  * @offset: The offset into the destination buffer.
  * @sdt: A pointer to the SDT.
  * @buf_sz: The size of the destination buffer.
  * @continuity_counter: A pointer to the CC. Incremented on every new packet.
  *
  */
 
 struct vidtv_psi_sdt_write_args {
     char *buf;
     u32 offset;
     struct vidtv_psi_table_sdt *sdt;
     u32 buf_sz;
     u8 *continuity_counter;
 };
 
 /**
  * vidtv_psi_sdt_write_into - Write SDT as MPEG-TS packets into a buffer.
  * @args: an instance of struct vidtv_psi_sdt_write_args
  *
  * This function writes the MPEG TS packets for a SDT table into a buffer.
  * Calling code will usually generate the SDT via a call to its init function
  * and thus is responsible for freeing it.
  *
  * Return: The number of bytes written into the buffer. This is NOT
  * equal to the size of the SDT, since more space is needed for TS headers during TS
  * encapsulation.
  */
 u32 vidtv_psi_sdt_write_into(struct vidtv_psi_sdt_write_args *args);
 
 /**
  * struct vidtv_psi_pmt_write_args - Arguments for writing a PMT section
  * @buf: The destination buffer.
  * @offset: The offset into the destination buffer.
  * @pmt: A pointer to the PMT.
  * @pid: Program ID
  * @buf_sz: The size of the destination buffer.
  * @continuity_counter: A pointer to the CC. Incremented on every new packet.
  * @pcr_pid: The TS PID used for the PSI packets. All channels will share the
  * same PCR.
  */
 struct vidtv_psi_pmt_write_args {
     char *buf;
     u32 offset;
     struct vidtv_psi_table_pmt *pmt;
     u16 pid;
     u32 buf_sz;
     u8 *continuity_counter;
     u16 pcr_pid;
 };
 
 /**
  * vidtv_psi_pmt_write_into - Write PMT as MPEG-TS packets into a buffer.
  * @args: an instance of struct vidtv_psi_pmt_write_args
  *
  * This function writes the MPEG TS packets for a PMT section into a buffer.
  * Calling code will usually generate the PMT section via a call to its init function
  * and thus is responsible for freeing it.
  *
  * Return: The number of bytes written into the buffer. This is NOT
  * equal to the size of the PMT section, since more space is needed for TS headers
  * during TS encapsulation.
  */
 u32 vidtv_psi_pmt_write_into(struct vidtv_psi_pmt_write_args *args);
 
 /**
  * vidtv_psi_find_pmt_sec - Finds the PMT section for 'program_num'
  * @pmt_sections: The sections to look into.
  * @nsections: The number of sections.
  * @program_num: The 'program_num' from PAT pointing to a PMT section.
  *
  * Return: A pointer to the PMT, if found, or NULL.
  */
 struct vidtv_psi_table_pmt *vidtv_psi_find_pmt_sec(struct vidtv_psi_table_pmt **pmt_sections,
                            u16 nsections,
                            u16 program_num);
 
 u16 vidtv_psi_get_pat_program_pid(struct vidtv_psi_table_pat_program *p);
 u16 vidtv_psi_pmt_stream_get_elem_pid(struct vidtv_psi_table_pmt_stream *s);
 
 /**
  * struct vidtv_psi_table_transport - A entry in the TS loop for the NIT and/or other tables.
  * See ETSI 300 468 section 5.2.1
  * @transport_id: The TS ID being described
  * @network_id: The network_id that contains the TS ID
  * @bitfield: Contains the descriptor loop length
  * @descriptor: A descriptor loop
  * @next: Pointer to the next entry
  *
  */
 struct vidtv_psi_table_transport {
     __be16 transport_id;
     __be16 network_id;
     __be16 bitfield; /* desc_len: 12, reserved: 4 */
     struct vidtv_psi_desc *descriptor;
     struct vidtv_psi_table_transport *next;
 } __packed;
 
 /**
  * struct vidtv_psi_table_nit - A Network Information Table (NIT). See ETSI 300
  * 468 section 5.2.1
  * @header: A PSI table header
  * @bitfield: Contains the network descriptor length
  * @descriptor: A descriptor loop describing the network
  * @bitfield2: Contains the transport stream loop length
  * @transport: The transport stream loop
  *
  */
 struct vidtv_psi_table_nit {
     struct vidtv_psi_table_header header;
     __be16 bitfield; /* network_desc_len: 12, reserved:4 */
     struct vidtv_psi_desc *descriptor;
     __be16 bitfield2; /* ts_loop_len: 12, reserved: 4 */
     struct vidtv_psi_table_transport *transport;
 } __packed;
 
 struct vidtv_psi_table_nit
 *vidtv_psi_nit_table_init(u16 network_id,
               u16 transport_stream_id,
               char *network_name,
               struct vidtv_psi_desc_service_list_entry *service_list);
 
 /**
  * struct vidtv_psi_nit_write_args - Arguments for writing a NIT section
  * @buf: The destination buffer.
  * @offset: The offset into the destination buffer.
  * @nit: A pointer to the NIT
  * @buf_sz: The size of the destination buffer.
  * @continuity_counter: A pointer to the CC. Incremented on every new packet.
  *
  */
 struct vidtv_psi_nit_write_args {
     char *buf;
     u32 offset;
     struct vidtv_psi_table_nit *nit;
     u32 buf_sz;
     u8 *continuity_counter;
 };
 
 /**
  * vidtv_psi_nit_write_into - Write NIT as MPEG-TS packets into a buffer.
  * @args: an instance of struct vidtv_psi_nit_write_args
  *
  * This function writes the MPEG TS packets for a NIT table into a buffer.
  * Calling code will usually generate the NIT via a call to its init function
  * and thus is responsible for freeing it.
  *
  * Return: The number of bytes written into the buffer. This is NOT
  * equal to the size of the NIT, since more space is needed for TS headers during TS
  * encapsulation.
  */
 u32 vidtv_psi_nit_write_into(struct vidtv_psi_nit_write_args *args);
 
 void vidtv_psi_nit_table_destroy(struct vidtv_psi_table_nit *nit);
 
 /*
  * struct vidtv_psi_desc_short_event - A short event descriptor
  * see ETSI EN 300 468 v1.15.1 section 6.2.37
  */
 struct vidtv_psi_table_eit_event {
     __be16 event_id;
     u8 start_time[5];
     u8 duration[3];
     __be16 bitfield; /* desc_length: 12, free_CA_mode: 1, running_status: 1 */
     struct vidtv_psi_desc *descriptor;
     struct vidtv_psi_table_eit_event *next;
 } __packed;
 
 /*
  * struct vidtv_psi_table_eit - A Event Information Table (EIT)
  * See ETSI 300 468 section 5.2.4
  */
 struct vidtv_psi_table_eit {
     struct vidtv_psi_table_header header;
     __be16 transport_id;
     __be16 network_id;
     u8 last_segment;
     u8 last_table_id;
     struct vidtv_psi_table_eit_event *event;
 } __packed;
 
 struct vidtv_psi_table_eit
 *vidtv_psi_eit_table_init(u16 network_id,
               u16 transport_stream_id,
               __be16 service_id);
 
 /**
  * struct vidtv_psi_eit_write_args - Arguments for writing an EIT section
  * @buf: The destination buffer.
  * @offset: The offset into the destination buffer.
  * @eit: A pointer to the EIT
  * @buf_sz: The size of the destination buffer.
  * @continuity_counter: A pointer to the CC. Incremented on every new packet.
  *
  */
 struct vidtv_psi_eit_write_args {
     char *buf;
     u32 offset;
     struct vidtv_psi_table_eit *eit;
     u32 buf_sz;
     u8 *continuity_counter;
 };
 
 /**
  * vidtv_psi_eit_write_into - Write EIT as MPEG-TS packets into a buffer.
  * @args: an instance of struct vidtv_psi_nit_write_args
  *
  * This function writes the MPEG TS packets for a EIT table into a buffer.
  * Calling code will usually generate the EIT via a call to its init function
  * and thus is responsible for freeing it.
  *
  * Return: The number of bytes written into the buffer. This is NOT
  * equal to the size of the EIT, since more space is needed for TS headers during TS
  * encapsulation.
  */
 u32 vidtv_psi_eit_write_into(struct vidtv_psi_eit_write_args *args);
 
 void vidtv_psi_eit_table_destroy(struct vidtv_psi_table_eit *eit);
 
 /**
  * vidtv_psi_eit_table_update_sec_len - Recompute and update the EIT section length.
  * @eit: The EIT whose length is to be updated.
  *
  * This will traverse the table and accumulate the length of its components,
  * which is then used to replace the 'section_length' field.
  *
  * If section_length > EIT_MAX_SECTION_LEN, the operation fails.
  */
 void vidtv_psi_eit_table_update_sec_len(struct vidtv_psi_table_eit *eit);
 
 /**
  * vidtv_psi_eit_event_assign - Assigns the event loop to the EIT.
  * @eit: The EIT to assign to.
  * @e: The event loop
  *
  * This will free the previous event loop in the table.
  * This will assign ownership of the stream loop to the table, i.e. the table
  * will free this stream loop when a call to its destroy function is made.
  */
 void vidtv_psi_eit_event_assign(struct vidtv_psi_table_eit *eit,
                 struct vidtv_psi_table_eit_event *e);
 
 struct vidtv_psi_table_eit_event
 *vidtv_psi_eit_event_init(struct vidtv_psi_table_eit_event *head, u16 event_id);
 
 void vidtv_psi_eit_event_destroy(struct vidtv_psi_table_eit_event *e);
 
 #endif // VIDTV_PSI_H

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