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 * For each program in the PAT, a PMT section will be created 13 * The PMT section for a channel will be assigned its streams. 14 * Every stream will have its corresponding encoder polled to produce TS packets 15 * These packets may be interleaved by the mux and then delivered to the bridge 16 * 17 * 18 * Copyright (C) 2020 Daniel W. S. Almeida 19 */ 20 21 #ifndef VIDTV_CHANNEL_H 22 #define VIDTV_CHANNEL_H 23 24 #include <linux/types.h> 25 #include "vidtv_psi.h" 26 #include "vidtv_encoder.h" 27 #include "vidtv_mux.h" 28 29 /** 30 * struct vidtv_channel - A 'channel' abstraction 31 * 32 * When vidtv boots, it will create some hardcoded channels. 33 * Their services will be concatenated to populate the SDT. 34 * Their programs will be concatenated to populate the PAT 35 * For each program in the PAT, a PMT section will be created 36 * The PMT section for a channel will be assigned its streams. 37 * Every stream will have its corresponding encoder polled to produce TS packets 38 * These packets may be interleaved by the mux and then delivered to the bridge 39 * 40 * @transport_stream_id: a number to identify the TS, chosen at will. 41 * @service: A _single_ service. Will be concatenated into the SDT. 42 * @program_num: The link between PAT, PMT and SDT. 43 * @program: A _single_ program with one or more streams associated with it. 44 * Will be concatenated into the PAT. 45 * @streams: A stream loop used to populate the PMT section for 'program' 46 * @encoders: A encoder loop. There must be one encoder for each stream. 47 * @next: Optionally chain this channel. 48 */ 49 struct vidtv_channel { 50 char *name; 51 u16 transport_stream_id; 52 struct vidtv_psi_table_sdt_service *service; 53 u16 program_num; 54 struct vidtv_psi_table_pat_program *program; 55 struct vidtv_psi_table_pmt_stream *streams; 56 struct vidtv_encoder *encoders; 57 struct vidtv_channel *next; 58 }; 59 60 /** 61 * vidtv_channel_si_init - Init the PSI tables from the channels in the mux 62 * @m: The mux containing the channels. 63 */ 64 void vidtv_channel_si_init(struct vidtv_mux *m); 65 void vidtv_channel_si_destroy(struct vidtv_mux *m); 66 67 /** 68 * vidtv_channels_init - Init hardcoded, fake 'channels'. 69 * @m: The mux to store the channels into. 70 */ 71 void vidtv_channels_init(struct vidtv_mux *m); 72 struct vidtv_channel 73 *vidtv_channel_s302m_init(struct vidtv_channel *head, u16 transport_stream_id); 74 void vidtv_channels_destroy(struct vidtv_mux *m); 75 76 #endif //VIDTV_CHANNEL_H 77