File Source

Reads raw data values in binary format from the specified file. This file can be a file that was captured using a File Sink block, generated with a computer program or saved from an audio editor such as Audacity (using suitable RAW format options).

Parameters

(R): Run-time adjustable

File (R)

Filename of binary file. Note: The file MUST be on the local computer.

The file size must not be less than 8 bytes, otherwise it gives the following error: "RuntimeError: file is too small"

Output Type

Because a binary file does not store information about what type of data is in it, we have to tell GNU Radio the format.

Repeat (R)

Whether or not to repeat the signal, once the end of the file is reached

Add Begin Tag (R)

Key of a tag to add to the first sample of the stream, and if Repeat is true, the first sample of each repeated copy. The provided expression must create a PMT. For example, pmt.intern("example_key") will create a key that represents the string "example_key". See Polymorphic_Types_(PMTs) and Stream_Tags for more information.

Offset

Start offset samples/items after the beginning of the file

Length

Read only this number of items beginning from offset(offset+len). 0 will read until the end of the file.

Example Flowgraph

This flowgraph can be found at https://github.com/gnuradio/gnuradio/blob/master/gr-dtv/examples/dvbt_rx_8k.grc.

Source Files

C++ files

https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/lib/file_source_impl.cc

Header files

https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/lib/file_source_impl.h

Public header files

https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/include/gnuradio/blocks/file_source.h

Block definition

https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/grc/blocks_file_source.block.yml