atsc

Documentation

Overview

Package atsc provides representations of ATSC television channel information.

Index

• type Channel
  • func ParseChannelsConf(r io.Reader) ([]Channel, error)
  • func (c Channel) String() string
• type Modulation

Types

type Channel

type Channel struct {
	Name        string
	FrequencyHz uint
	Modulation  Modulation
	VideoPID    uint
	AudioPID    uint
	ProgramID   uint
}

Channel represents the definition of an ATSC television channel.

func ParseChannelsConf

func ParseChannelsConf(r io.Reader) ([]Channel, error)

ParseChannelsConf parses Channels from an azap-compatible channels.conf file read from r.

Each line of the file defines a single channel, and is formatted as 6 colon-separated fields corresponding to the fields of Channel as follows:

Name:FrequencyHz:Modulation:VideoPID:AudioPID:ProgramID

FrequencyHz, VideoPID, AudioPID, and ProgramID are all represented in decimal form.

The https://github.com/stefantalpalaru/w_scan2 utility is useful for generating a compatible file. For example, to scan for terrestrial broadcast channels in the United States of America:

w_scan2 -f a -c us -X > channels.conf

func (Channel) String

func (c Channel) String() string

String returns the representation of c in the azap-compatible format described by ParseChannelsConf.

type Modulation

type Modulation string

Modulation represents the modulation of an ATSC television channel.

const (
	// Modulation8VSB may also be parsed as "VSB_8" in a channels.conf file.
	Modulation8VSB   Modulation = "8VSB"
	ModulationQAM64  Modulation = "QAM_64"
	ModulationQAM256 Modulation = "QAM_256"
)

The following are the normalized Modulation values for a Channel.