File Source: Difference between revisions
Jump to navigation
Jump to search
No edit summary |
m (Unbracket bare URL(s). There is good reason not to disguise the links, and readers should be able to see the filename without hovering.) |
||
| (8 intermediate revisions by 6 users not shown) | |||
| Line 6: | Line 6: | ||
; File (''R'') | ; File (''R'') | ||
: Filename of binary file. | : Filename of binary file. <b>Note:</b> 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 | ; Output Type | ||
| Line 15: | Line 16: | ||
; Add Begin Tag (''R'') | ; 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, <code>pmt.intern("example_key")</code> will create a key that represents the string <code>"example_key"</code>. See [[Polymorphic_Types_(PMTs)]] and [[Stream_Tags]] for more information. | ||
; Offset | ; Offset | ||
: | : Start offset samples/items after the beginning of the file | ||
; Length | ; Length | ||
: | : Read only this number of items beginning from offset(offset+len). 0 will read until the end of the file. | ||
== Example Flowgraph == | == Example Flowgraph == | ||
This flowgraph can be found at https://github.com/gnuradio/gnuradio/blob/master/gr-dtv/examples/dvbt_rx_8k.grc. | |||
[[File:Dvbt_rx_8k_fg.png|800px]] | |||
== Source Files == | == Source Files == | ||
; C++ files | ; C++ files | ||
: | : https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/lib/file_source_impl.cc | ||
; Header files | ; Header files | ||
: | : https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/lib/file_source_impl.h | ||
; Public header files | ; Public header files | ||
: | : https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/include/gnuradio/blocks/file_source.h | ||
; Block definition | ; Block definition | ||
: | : https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/grc/blocks_file_source.block.yml | ||
Latest revision as of 08:43, 27 April 2023
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.
