drivers/media/test-drivers/vidtv/vidtv_channel.h

   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