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 | |