LXR linux/drivers/media/test-drivers/vidtv/vidtv

   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 */
  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 mux
  67 * @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_channel
  78*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_H
  82