misrc_capture is a simple CLI (command line interface) tool to trigger capture from the ADC channels and the AUX data pins.

This now has misrc_extract integrated with libflac meaning it can unpack and compress data streams in real-time.

The MISRC captures with 2 ADC channels 12-bit and the 6-bit AUX data is interleaved into 32 bit words, so you end up with a 32-bit word stream.

This tool interacts with hsdaoh takes the RF stream de-interleaves that data to s16 and or compresses it to FLAC.

The new and current capture workflow is using the Tang Nano as an FPGA sending raw data over a YUV 4:2:2 stream.

This data is then captured with MS2130 or MS2131 based cards.

You can save the RF stream in the following flavors

• 32-bit .bin raw feed to file
• 16-bit .s16 raw upacked data to file
• 16-bit .flac lossless compressed data to file

Tested and built on Linux Mint 21.03 and 22 / Ubuntu 22.04

First install dependencies

• apt install libflac-dev
• Install hsdaoh this allows you to use the MS2130 & MS2131 chips directly.

Restart and then continue

Install capture & extract tools (Linux & MacOS)

git clone https://github.com/Stefan-Olt/MISRC.git

Enter Directory

cd MISRC/misrc_tools

Build and install

mkdir build
cd build
cmake ..
make
sudo make install

Run mirsc_extract or misrc_capture in any directory without arguments to trigger the help menu.

Create a folder which you wish to capture inside, open it inside terminal and then run misrc_capture

Append the start of video_rf & hifi_rf with your tape or project name as you need.

Example RAW:

misrc_capture -a video_rf.s16 -b hifi_rf.s16

Example with FLAC compression:

misrc_capture -p -f -a video_rf.flac -b hifi_rf.flac 

Example with AUX pins capture (PCM1802 audio example)

misrc_capture -p -f -a video_rf.flac -b hifi_rf.flac -x pcm1802.bin

You can also define its directory path of each RF stream manually:

misrc_capture -p -f -a /mnt/my_video_storrage/video_rf.flac -b ../../this/is/a/relative/path/hifi_rf.flac

• Run tools without arguments to see options

Press Ctrl+C to copy and Ctrl+P to past your config from a notepad or txt file.

Use <+> to move edit position on the command line to edit the name or command while in terminal and Enter to run the command.

Ctrl+C Will kill the current process, use this to stop the capture manually.

-d device_index (default: 0)

-n number of samples to read (default: 0, infinite)

-a ADC A output file (use '-' to write on stdout)

-b ADC B output file (use '-' to write on stdout)

-x AUX output file (use '-' to write on stdout) (6 aux pins for audio ADCs)

-r raw data output file (use '-' to write on stdout)

-p pad lower 4 bits of 16 bit output with 0 instead of upper 4

-f compress ADC output as FLAC

-l LEVEL set flac compression level (default: 1)

-v enable verification of flac encoder output