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/**
* The zapchannel file format specifies tuning parameters for channels. Each line describes
* a single channel, and consists of multiple options separated by ':'. The exact
* format of each line depends on the DVB type of the channel (i.e. DVBS, DVBT, DVBC, or ATSC).
*
* Note: the lines have been split across multiple lines in the following due to length issues.
*
* The format for DVBT channels is:
*
* <name>:<frequency>:<inversion>:<bandwidth>:<fec_hp>:<fec_lp>:
* <constellation>:<transmission>:<guard_interval>:<hierarchy>:
* <video_pid>:<audio_pid>:<channel_number>
*
* name: name of the channel
* frequency: frequency in Hz
* inversion: one of INVERSION_OFF, INVERSION_ON, or INVERSION_AUTO.
* bandwidth: one of BANDWIDTH_6_MHZ, BANDWIDTH_7_MHZ, or BANDWIDTH_8_MHZ.
* fec_hp: FEC of the high priority stream, one of: FEC_1_2, FEC_2_3,
* FEC_3_4, FEC_4_5, FEC_5_6, FEC_6_7, FEC_7_8, FEC_8_9, or FEC_AUTO.
* fec_lp: FEC of the low priority stream, one of: FEC_1_2, FEC_2_3,
* FEC_3_4, FEC_4_5, FEC_5_6, FEC_6_7, FEC_7_8, FEC_8_9, FEC_AUTO, or FEC_NONE.
* constellation: one of QPSK, QAM_128, QAM_16, QAM_256, QAM_32, or QAM_64.
* transmission: one of TRANSMISSION_MODE_2K, or TRANSMISSION_MODE_8K.
* guard_interval: one of GUARD_INTERVAL_1_32, GUARD_INTERVAL_1_16, GUARD_INTERVAL_1_8, or GUARD_INTERVAL_1_4.
* hierarchy: one of HIERARCHY_NONE, HIERARCHY_1, HIERARCHY_2, or HIERARCHY_4.
* video_pid: PID of the video stream.
* audio_pid: PID of the audio stream.
* channel_number: Transport stream channel number of the program.
*
* DVBC:
*
* <name>:<frequency>:<inversion>:<symbol_rate>:<fec>:
* <modulation>:<video_pid>:<audio_pid>:<channel_number>
*
* name: name of the channel
* frequency: frequency in Hz
* inversion: one of INVERSION_OFF, INVERSION_ON, or INVERSION_AUTO.
* symbol_rate: Symbol rate of the channel in ksyms.
* fec: One of: FEC_1_2, FEC_2_3, FEC_3_4, FEC_4_5, FEC_5_6, FEC_6_7,
* FEC_7_8, FEC_8_9, or FEC_AUTO.
* modulation: one of QAM_16, QAM_32, QAM_64, QAM_128, QAM_256, QAM_AUTO.
* video_pid: PID of the video stream.
* audio_pid: PID of the audio stream.
* channel_number: Transport stream channel number of the program.
*
* DVBS:
*
* <name>:<frequency>:<polarization>:<satellite_switches>:<symbol_rate>:<video_pid>:<audio_pid>:<channel_number>
*
* name: name of the channel
* frequency: frequency in kHz
* polarization: one of H,V,L, or R.
* satellite_switches: Treated as a 2 bit value controlling switches in SEC equipment:
* bit 0: controls "satellite switch", 0: A, 1: B
* bit 1: controls "switch option", 0: A, 1: B
* symbol_rate: Symbol rate of the channel in ksyms.
* video_pid: PID of the video stream.
* audio_pid: PID of the audio stream.
* channel_number: Transport stream channel number of the program.
*
* ATSC:
*
* <name>:<frequency>:<inversion>:<modulation>:<video_pid>:<audio_pid>:<channel_number>
*
* name: name of the channel
* frequency: frequency in GHz
* inversion: one of INVERSION_OFF, INVERSION_ON, or INVERSION_AUTO.
* modulation: one of 8VSB, 16VSB, QAM_64, or QAM_256.
* video_pid: PID of the video stream.
* audio_pid: PID of the audio stream.
* channel_number: Transport stream channel number of the program.
*/
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