GNU Radio C++ API
audio_alsa_source Class Reference

audio source using ALSAThe source has between 1 and N input streams of floats, where N is depends on the hardware characteristics of the selected device. More...

#include <audio_alsa_source.h>

Inheritance diagram for audio_alsa_source:

Public Member Functions

 audio_alsa_source (int sampling_rate, const std::string device_name, bool ok_to_block)
 
 ~audio_alsa_source ()
 
bool check_topology (int ninputs, int noutputs)
 Confirm that ninputs and noutputs is an acceptable combination. More...
 
int work (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
 just like gr_block::general_work, only this arranges to call consume_each for you More...
 

Protected Member Functions

bool read_buffer (void *buffer, unsigned nframes, unsigned sizeof_frame)
 
int work_s16 (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
 
int work_s16_2x1 (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
 
int work_s32 (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
 
int work_s32_2x1 (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
 

Additional Inherited Members

- Public Types inherited from audio_source
typedef boost::shared_ptr
< audio_source
sptr
 
- Protected Types inherited from gr_basic_block
enum  vcolor { WHITE, GREY, BLACK }
 
- Protected Attributes inherited from gr_basic_block
std::string d_name
 
gr_io_signature_sptr d_input_signature
 
gr_io_signature_sptr d_output_signature
 
long d_unique_id
 
vcolor d_color
 

Detailed Description

audio source using ALSA

The source has between 1 and N input streams of floats, where N is depends on the hardware characteristics of the selected device.

Output samples will be in the range [-1,1].

Constructor & Destructor Documentation

audio_alsa_source::audio_alsa_source ( int  sampling_rate,
const std::string  device_name,
bool  ok_to_block 
)
audio_alsa_source::~audio_alsa_source ( )

Member Function Documentation

bool audio_alsa_source::check_topology ( int  ninputs,
int  noutputs 
)
virtual

Confirm that ninputs and noutputs is an acceptable combination.

Parameters
ninputsnumber of input streams connected
noutputsnumber of output streams connected
Returns
true if this is a valid configuration for this block.

This function is called by the runtime system whenever the topology changes. Most classes do not need to override this. This check is in addition to the constraints specified by the input and output gr_io_signatures.

Reimplemented from gr_basic_block.

bool audio_alsa_source::read_buffer ( void *  buffer,
unsigned  nframes,
unsigned  sizeof_frame 
)
protected
int audio_alsa_source::work ( int  noutput_items,
gr_vector_const_void_star input_items,
gr_vector_void_star output_items 
)
virtual

just like gr_block::general_work, only this arranges to call consume_each for you

The user must override work to define the signal processing code

Implements gr_sync_block.

int audio_alsa_source::work_s16 ( int  noutput_items,
gr_vector_const_void_star input_items,
gr_vector_void_star output_items 
)
protected
int audio_alsa_source::work_s16_2x1 ( int  noutput_items,
gr_vector_const_void_star input_items,
gr_vector_void_star output_items 
)
protected
int audio_alsa_source::work_s32 ( int  noutput_items,
gr_vector_const_void_star input_items,
gr_vector_void_star output_items 
)
protected
int audio_alsa_source::work_s32_2x1 ( int  noutput_items,
gr_vector_const_void_star input_items,
gr_vector_void_star output_items 
)
protected

The documentation for this class was generated from the following file: