1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Vidtv serves as a reference DVB driver and helps validate the existing APIs 4 * in the media subsystem. It can also aid developers working on userspace 5 * 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 PAT 12 * Their events will be concatenated to populate the EIT 13 * For each program in the PAT, a PMT section will be created 14 * The PMT section for a channel will be assigned its streams. 15 * Every stream will have its corresponding encoder polled to produce TS packets 16 * These packets may be interleaved by the mux and then delivered to the bridge 17 * 18 * 19 * Copyright (C) 2020 Daniel W. S. Almeida 20 */ 21 22 #ifndef VIDTV_CHANNEL_H 23 #define VIDTV_CHANNEL_H 24 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' abstraction 33 * 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 PAT 37 * For each program in the PAT, a PMT section will be created 38 * The PMT section for a channel will be assigned its streams. 39 * Every stream will have its corresponding encoder polled to produce TS packets 40 * These packets may be interleaved by the mux and then delivered to the bridge 41 * 42 * @name: name of the channel 43 * @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 */ 53 struct 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 mux 67 * @m: The mux containing the channels. 68 */ 69 int vidtv_channel_si_init(struct vidtv_mux *m); 70 void 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 */ 76 int vidtv_channels_init(struct vidtv_mux *m); 77 struct vidtv_channel 78 *vidtv_channel_s302m_init(struct vidtv_channel *head, u16 transport_stream_id); 79 void vidtv_channels_destroy(struct vidtv_mux *m); 80 81 #endif //VIDTV_CHANNEL_H 82