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