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

• [x] CX Card & DdD Usage
• [x] RTLSDR Usage

Input RF Support

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

Output Codec

• [x] FLAC (.flac)
• [x] PCM (.wav)

Output Sample Rate

--audio_rate Defines Output Sampling Rate Now.

• [x] 192khz
• [x] 96khz
• [x] 48khz
• [x] 44.1khz

Output Bit Depth

• [x] 24-bit (Interger)

Audio Level Control

• [x] Amplitude Gain Control
• [ ] Conform to -3 dB
• [ ] Conform to EBU R128

Utility Modes

• [x] Live Output
• [x] GNU Radio Passthrough
• [ ] Demodulation Live Graph

Format Support

• [x] (S)VHS
• [ ] BetaMax (needs proper implimentation)
• [x] 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
• [x] 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