/* SPDX-License-Identifier: GPL-2.0 */
/*
* Vidtv serves as a reference DVB driver and helps validate the existing APIs
* in the media subsystem . It can also aid developers working on userspace
* applications .
*
* This file contains the code for a ' channel ' abstraction .
*
* When vidtv boots , it will create some hardcoded channels .
* Their services will be concatenated to populate the SDT .
* Their programs will be concatenated to populate the PAT
* Their events will be concatenated to populate the EIT
* For each program in the PAT , a PMT section will be created
* The PMT section for a channel will be assigned its streams .
* Every stream will have its corresponding encoder polled to produce TS packets
* These packets may be interleaved by the mux and then delivered to the bridge
*
*
* Copyright ( C ) 2020 Daniel W . S . Almeida
*/
#ifndef VIDTV_CHANNEL_H
#define VIDTV_CHANNEL_H
#include <linux/types.h>
#include "vidtv_encoder.h"
#include "vidtv_mux.h"
#include "vidtv_psi.h"
/**
* struct vidtv_channel - A ' channel ' abstraction
*
* When vidtv boots , it will create some hardcoded channels .
* Their services will be concatenated to populate the SDT .
* Their programs will be concatenated to populate the PAT
* For each program in the PAT , a PMT section will be created
* The PMT section for a channel will be assigned its streams .
* Every stream will have its corresponding encoder polled to produce TS packets
* These packets may be interleaved by the mux and then delivered to the bridge
*
* @ name : name of the channel
* @ transport_stream_id : a number to identify the TS , chosen at will .
* @ service : A _ single_ service . Will be concatenated into the SDT .
* @ program_num : The link between PAT , PMT and SDT .
* @ program : A _ single_ program with one or more streams associated with it .
* Will be concatenated into the PAT .
* @ streams : A stream loop used to populate the PMT section for ' program '
* @ encoders : A encoder loop . There must be one encoder for each stream .
* @ events : Optional event information . This will feed into the EIT .
* @ next : Optionally chain this channel .
*/
struct vidtv_channel {
char *name;
u16 transport_stream_id;
struct vidtv_psi_table_sdt_service *service;
u16 program_num;
struct vidtv_psi_table_pat_program *program;
struct vidtv_psi_table_pmt_stream *streams;
struct vidtv_encoder *encoders;
struct vidtv_psi_table_eit_event *events;
struct vidtv_channel *next;
};
/**
* vidtv_channel_si_init - Init the PSI tables from the channels in the mux
* @ m : The mux containing the channels .
*/
int vidtv_channel_si_init(struct vidtv_mux *m);
void vidtv_channel_si_destroy(struct vidtv_mux *m);
/**
* vidtv_channels_init - Init hardcoded , fake ' channels ' .
* @ m : The mux to store the channels into .
*/
int vidtv_channels_init(struct vidtv_mux *m);
struct vidtv_channel
*vidtv_channel_s302m_init(struct vidtv_channel *head, u16 transport_stream_id);
void vidtv_channels_destroy(struct vidtv_mux *m);
#endif //VIDTV_CHANNEL_H
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