HiFi Decode Development & Improvements

[harrypm]

Currently, HiFi decode is fully working but needs improvements that have already been discussed since it is now merged I'll create this issue here for reference.

Documentation

• CX Card & DdD Usage
• RTLSDR Usage

Input RF Support

• Sample rate input -f In hz/mhz etc
• CXADC Modes
• 16-bit Signed (DdD)
• 10-bit Packed (DdD) (requires ld-lds-intergration)
• IQ files (RTLSDR)
• FLAC Compresed 8-bit
• FLAC Compresed 16-bit (.ldf)

Output Codec

• FLAC (.flac)
• PCM (.wav)

Output Sample Rate

--audio_rate Defines Output Sampling Rate Now.

• 192khz
• 96khz
• 48khz
• 44.1khz

Output Bit Depth

• 24-bit (Interger)

Audio Level Control

• Amplitude Gain Control
• Conform to -3 dB
• Conform to EBU R128

Utility Modes

• Live Output
• GNU Radio Passthrough
• Demodulation Live Graph

Format Support

• (S)VHS
• BetaMax (needs proper implimentation)
• Sony 8mm (Video8/High8) (PAL needs work)
• PCM Tapes

Format Detection

• Prompt to also decode audio if vhs-decode has video8/hi8 format flag present.

Logging

General Logging:

• Input rf file sample rate
• Output sample rate
• Some system info and software version info
• Signal to noise / Dropout information.

Per "block":

• Input (RF) file position
• Output PCM position (basically the corresponding output sample to the input RF sample, disregarding any subsequent Compression, flac or otherwise)
• Some info on the signal strength maybe? so that dropouts could be detected
• PC wall clock time, when the block was written out (could also be relative in ms since start of decoding, could be later used to gauge and improve on performance)

[VideoMem]

Arbitrary output sample rate support added on #119