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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Vidtv serves as a reference DVB driver and helps validate the existing APIs4 * in the media subsystem. It can also aid developers working on userspace5 * applications.6 *7 * This file contains the code for a 'channel' abstraction.8 *9 * When vidtv boots, it will create some hardcoded channels.10 * Their services will be concatenated to populate the SDT.11 * Their programs will be concatenated to populate the PAT12 * Their events will be concatenated to populate the EIT13 * For each program in the PAT, a PMT section will be created14 * The PMT section for a channel will be assigned its streams.15 * Every stream will have its corresponding encoder polled to produce TS packets16 * These packets may be interleaved by the mux and then delivered to the bridge17 *18 *19 * Copyright (C) 2020 Daniel W. S. Almeida20 */21 22#ifndef VIDTV_CHANNEL_H23#define VIDTV_CHANNEL_H24 25#include <linux/types.h>26 27#include "vidtv_encoder.h"28#include "vidtv_mux.h"29#include "vidtv_psi.h"30 31/**32 * struct vidtv_channel - A 'channel' abstraction33 *34 * When vidtv boots, it will create some hardcoded channels.35 * Their services will be concatenated to populate the SDT.36 * Their programs will be concatenated to populate the PAT37 * For each program in the PAT, a PMT section will be created38 * The PMT section for a channel will be assigned its streams.39 * Every stream will have its corresponding encoder polled to produce TS packets40 * These packets may be interleaved by the mux and then delivered to the bridge41 *42 * @name: name of the channel43 * @transport_stream_id: a number to identify the TS, chosen at will.44 * @service: A _single_ service. Will be concatenated into the SDT.45 * @program_num: The link between PAT, PMT and SDT.46 * @program: A _single_ program with one or more streams associated with it.47 * Will be concatenated into the PAT.48 * @streams: A stream loop used to populate the PMT section for 'program'49 * @encoders: A encoder loop. There must be one encoder for each stream.50 * @events: Optional event information. This will feed into the EIT.51 * @next: Optionally chain this channel.52 */53struct vidtv_channel {54 char *name;55 u16 transport_stream_id;56 struct vidtv_psi_table_sdt_service *service;57 u16 program_num;58 struct vidtv_psi_table_pat_program *program;59 struct vidtv_psi_table_pmt_stream *streams;60 struct vidtv_encoder *encoders;61 struct vidtv_psi_table_eit_event *events;62 struct vidtv_channel *next;63};64 65/**66 * vidtv_channel_si_init - Init the PSI tables from the channels in the mux67 * @m: The mux containing the channels.68 */69int vidtv_channel_si_init(struct vidtv_mux *m);70void vidtv_channel_si_destroy(struct vidtv_mux *m);71 72/**73 * vidtv_channels_init - Init hardcoded, fake 'channels'.74 * @m: The mux to store the channels into.75 */76int vidtv_channels_init(struct vidtv_mux *m);77struct vidtv_channel78*vidtv_channel_s302m_init(struct vidtv_channel *head, u16 transport_stream_id);79void vidtv_channels_destroy(struct vidtv_mux *m);80 81#endif //VIDTV_CHANNEL_H82