Namespaces
	kernel

	pdu

Classes
class	abs_ff
	output[m] = abs(input[m]) for all M streams. More...

class	abs_ii
	output[m] = abs(input[m]) for all M streams. More...

class	abs_ss
	output[m] = abs(input[m]) for all M streams. More...

class	add_cc
	output = sum(input[0], input[1], ..., input[M-1]) More...

class	add_const_bb
	output = input + constant More...

class	add_const_cc
	output = input + constant More...

class	add_const_ff
	output = input + constant More...

class	add_const_ii
	output = input + constant More...

class	add_const_ss
	output = input + constant More...

class	add_const_vbb
	output[m] = input[m] + constant vector for all M streams. More...

class	add_const_vcc
	output[m] = input[m] + constant vector for all M streams. More...

class	add_const_vff
	output[m] = input[m] + constant vector for all M streams. More...

class	add_const_vii
	output[m] = input[m] + constant vector for all M streams. More...

class	add_const_vss
	output[m] = input[m] + constant vector for all M streams. More...

class	add_ff
	output = sum (input_0, input_1, ...) More...

class	add_ii
	output = sum(input[0], input[1], ..., input[M-1]) More...

class	add_ss
	output = sum(input[0], input[1], ..., input[M-1]) More...

class	and_bb
	output = input[0] & input[1] & ... & input[M-1] More...

class	and_const_bb
	output[m] = input[m] & value for all M streams. More...

class	and_const_ii
	output[m] = input[m] & value for all M streams. More...

class	and_const_ss
	output[m] = input[m] & value for all M streams. More...

class	and_ii
	output = input[0] & input[1] & ... & input[M-1] More...

class	and_ss
	output = input[0] & input[1] & ... & input[M-1] More...

class	annotator_1to1
	1-to-1 stream annotator testing block. FOR TESTING PURPOSES ONLY. More...

class	annotator_alltoall
	All-to-all stream annotator testing block. FOR TESTING PURPOSES ONLY. More...

class	annotator_raw
	raw stream annotator testing block. More...

class	argmax_fs
	Compares vectors from multiple streams and determines the index in the vector and stream number where the maximum value occurred. More...

class	argmax_is
	Compares vectors from multiple streams and determines the index in the vector and stream number where the maximum value occurred. More...

class	argmax_ss
	Compares vectors from multiple streams and determines the index in the vector and stream number where the maximum value occurred. More...

class	bin_statistics_f
	control scanning and record frequency domain statistics More...

class	burst_tagger
	Sets a burst on/off tag based on the value of the trigger input. More...

class	char_to_float
	Convert stream of chars to a stream of float. More...

class	char_to_short
	Convert stream of chars to a stream of shorts. More...

class	check_lfsr_32k_s
	sink that checks if its input stream consists of a lfsr_32k sequence. More...

class	complex_to_arg
	complex in, arg (arctan) out (float) More...

class	complex_to_float
	Convert a stream of gr_complex to 1 or 2 streams of float. More...

class	complex_to_imag
	Produces the imaginary part (as a float0 of a complex stream. More...

class	complex_to_interleaved_char
	Convert stream of complex to a stream of interleaved chars. More...

class	complex_to_interleaved_short
	Convert stream of complex to a stream of interleaved shorts. More...

class	complex_to_mag
	complex in, magnitude out (float) More...

class	complex_to_mag_squared
	complex in, magnitude squared out (float) More...

class	complex_to_magphase
	Convert a stream of gr_complex to magnitude and phase (both floats) More...

class	complex_to_real
	Produces the real part (as a float0 of a complex stream. More...

class	conjugate_cc
	output = complex conjugate of input More...

class	control_loop
	A second-order control loop implementation class. More...

class	copy
	output[i] = input[i] More...

class	ctrlport_probe2_b
	A ControlPort probe to export vectors of signals. More...

class	ctrlport_probe2_c
	A ControlPort probe to export vectors of signals. More...

class	ctrlport_probe2_f
	A ControlPort probe to export vectors of signals. More...

class	ctrlport_probe2_i
	A ControlPort probe to export vectors of signals. More...

class	ctrlport_probe2_s
	A ControlPort probe to export vectors of signals. More...

class	ctrlport_probe_c
	A ControlPort probe to export vectors of signals. More...

class	deinterleave
	deinterleave an input block of samples into N outputs. More...

class	delay
	delay the input by a certain number of samplesPositive delays insert zero items at the beginning of the stream. Negative delays discard items from the stream. More...

class	divide_cc
	output = input[0] / input[1] / ... / input[M-1] More...

class	divide_ff
	output = input[0] / input[1] / ... / input[M-1] More...

class	divide_ii
	output = input[0] / input[1] / ... / input[M-1] More...

class	divide_ss
	output = input[0] / input[1] / ... / input[M-1] More...

class	endian_swap
	Convert stream of items into thier byte swapped version. More...

class	file_descriptor_sink
	Write stream to file descriptor. More...

class	file_descriptor_source
	Read stream from file descriptor. More...

class	file_meta_sink
	Write stream to file with meta-data headers. More...

class	file_meta_source
	Reads stream from file with meta-data headers. Headers are parsed into tags. More...

class	file_sink
	Write stream to file. More...

class	file_sink_base
	Common base class for file sinks. More...

class	file_source
	Read stream from file. More...

class	float_to_char
	Convert stream of floats to a stream of char. More...

class	float_to_complex
	one or two floats in, complex out More...

class	float_to_int
	Convert stream of floats to a stream of ints. More...

class	float_to_short
	Convert stream of floats to a stream of shorts. More...

class	float_to_uchar
	Convert stream of floats to a stream of unsigned chars. More...

class	head
	copies the first N items to the output then signals done More...

class	int_to_float
	Convert stream of ints to a stream of floats. More...

class	integrate_cc
	Integrate successive samples and decimate. More...

class	integrate_ff
	Integrate successive samples and decimate. More...

class	integrate_ii
	Integrate successive samples and decimate. More...

class	integrate_ss
	Integrate successive samples and decimate. More...

class	interleave
	interleave N inputs into a single output More...

class	interleaved_char_to_complex
	Convert stream of interleaved chars to a stream of complex. More...

class	interleaved_short_to_complex
	Convert stream of interleaved shorts to a stream of complex. More...

class	keep_m_in_n
	decimate a stream, keeping `m` items out of every `n`. More...

class	keep_one_in_n
	decimate a stream, keeping one item out of every `n`. More...

class	lfsr_15_1_0
	Linear Feedback Shift Register using primitive polynomial x^15 + x + 1. More...

class	lfsr_32k
	generate pseudo-random sequence of length 32768 bits. More...

class	lfsr_32k_source_s
	LFSR pseudo-random source with period of 2^15 bits (2^11 shorts) More...

class	magphase_to_complex
	two floats in (mag and phase), complex out More...

class	max_ff
	Compares vectors from multiple streams and determines the maximum value from each vector over all streams. More...

class	max_ii
	Compares vectors from multiple streams and determines the maximum value from each vector over all streams. More...

class	max_ss
	Compares vectors from multiple streams and determines the maximum value from each vector over all streams. More...

class	message_burst_source
	Turn received messages into a stream and tag them for UHD to send. More...

class	message_debug
	Debug block for the message passing system. More...

class	message_sink
	Gather received items into messages and insert into msgq. More...

class	message_source
	Turn received messages into a stream. More...

class	message_strobe
	Send message at defined interval. More...

class	message_strobe_random
	Send message at defined interval. More...

class	min_ff
	Compares vectors from multiple streams and determines the minimum value from each vector over all streams. More...

class	min_ii
	Compares vectors from multiple streams and determines the minimum value from each vector over all streams. More...

class	min_ss
	Compares vectors from multiple streams and determines the minimum value from each vector over all streams. More...

class	moving_average_cc
	output is the moving sum of the last N samples, scaled by the scale factor More...

class	moving_average_ff
	output is the moving sum of the last N samples, scaled by the scale factor More...

class	moving_average_ii
	output is the moving sum of the last N samples, scaled by the scale factor More...

class	moving_average_ss
	output is the moving sum of the last N samples, scaled by the scale factor More...

class	multiply_cc
	output = prod (input_0, input_1, ...) More...

class	multiply_conjugate_cc
	Multiplies stream 0 by the complex conjugate of stream 1. More...

class	multiply_const_cc
	output = input * complex constant More...

class	multiply_const_ff
	output = input * real constant More...

class	multiply_const_ii
	output = input * constant More...

class	multiply_const_ss
	output = input * constant More...

class	multiply_const_vcc
	output = input * constant vector (element-wise) More...

class	multiply_const_vff
	output = input * constant vector (element-wise) More...

class	multiply_const_vii
	output = input * constant vector (element-wise) More...

class	multiply_const_vss
	output = input * constant vector (element-wise) More...

class	multiply_ff
	output = prod (input_0, input_1, ...) More...

class	multiply_ii
	output = prod (input_0, input_1, ...) More...

class	multiply_matrix_cc
	Matrix multiplexer/multiplier: y(k) = A * x(k)This block is similar to gr::blocks::multiply_const_ff, the difference being it can handle several inputs and outputs, and the input-to-output relation can be described by the following mathematical equation: $\mathbf{y}(k) = \mathbf{A} \mathbf{x}(k) \, , \, y \in \mathbb{R}^N, \mathbf{x} \in \mathbb{R}^M, A \in \mathbb{R}^{N \times M}$ $\mathbf{y}(k)$ and $\mathbf{x}(i)$ are column-vectors describing the elements on the input port at time step (this is a sync block with no memory). More...

class	multiply_matrix_ff
	Matrix multiplexer/multiplier: y(k) = A * x(k)This block is similar to gr::blocks::multiply_const_ff, the difference being it can handle several inputs and outputs, and the input-to-output relation can be described by the following mathematical equation: $\mathbf{y}(k) = \mathbf{A} \mathbf{x}(k) \, , \, y \in \mathbb{R}^N, \mathbf{x} \in \mathbb{R}^M, A \in \mathbb{R}^{N \times M}$ $\mathbf{y}(k)$ and $\mathbf{x}(i)$ are column-vectors describing the elements on the input port at time step (this is a sync block with no memory). More...

class	multiply_ss
	output = prod (input_0, input_1, ...) More...

class	mute_cc
	output = input or zero if muted. More...

class	mute_ff
	output = input or zero if muted. More...

class	mute_ii
	output = input or zero if muted. More...

class	mute_ss
	output = input or zero if muted. More...

class	nlog10_ff
	output = n*log10(input) + k More...

class	nop
	Does nothing. Used for testing only. More...

class	not_bb
	output = ~inputbitwise boolean not of input streams. More...

class	not_ii
	output = ~inputbitwise boolean not of input streams. More...

class	not_ss
	output = ~inputbitwise boolean not of input streams. More...

class	null_sink
	Bit bucket. Use as a termination point when a sink is required and we don't want to do anything real. More...

class	null_source
	A source of zeros used mainly for testing. More...

class	or_bb
	output = input_0 \| input_1 \| , ... \| input_N)Bitwise boolean or across all input streams. More...

class	or_ii
	output = input_0 \| input_1 \| , ... \| input_N)Bitwise boolean or across all input streams. More...

class	or_ss
	output = input_0 \| input_1 \| , ... \| input_N)Bitwise boolean or across all input streams. More...

class	pack_k_bits_bb
	Converts a stream of bytes with 1 bit in the LSB to a byte with k relevent bits. More...

class	packed_to_unpacked_bb
	Convert a stream of packed bytes or shorts to stream of unpacked bytes or shorts. More...

class	packed_to_unpacked_ii
	Convert a stream of packed bytes or shorts to stream of unpacked bytes or shorts. More...

class	packed_to_unpacked_ss
	Convert a stream of packed bytes or shorts to stream of unpacked bytes or shorts. More...

class	patterned_interleaver
	Interleave items based on the provided vector `pattern`. More...

class	pdu_filter
	Propagates only pdus containing k=>v in meta. More...

class	pdu_remove
	remove key k in pdu's meta field and pass on More...

class	pdu_set
	Set k=>v in pdu's meta field and pass on. More...

class	pdu_to_tagged_stream
	Turns received PDUs into a tagged stream of items. More...

class	peak_detector2_fb
	Detect the peak of a signal. More...

class	peak_detector_fb
	Detect the peak of a signal. More...

class	peak_detector_ib
	Detect the peak of a signal. More...

class	peak_detector_sb
	Detect the peak of a signal. More...

class	plateau_detector_fb
	Detects a plateau and marks the middle. More...

class	probe_rate
	throughput measurement More...

class	probe_signal_b
	Sink that allows a sample to be grabbed from Python. More...

class	probe_signal_c
	Sink that allows a sample to be grabbed from Python. More...

class	probe_signal_f
	Sink that allows a sample to be grabbed from Python. More...

class	probe_signal_i
	Sink that allows a sample to be grabbed from Python. More...

class	probe_signal_s
	Sink that allows a sample to be grabbed from Python. More...

class	probe_signal_vb
	Sink that allows a vector of samples to be grabbed from Python. More...

class	probe_signal_vc
	Sink that allows a vector of samples to be grabbed from Python. More...

class	probe_signal_vf
	Sink that allows a vector of samples to be grabbed from Python. More...

class	probe_signal_vi
	Sink that allows a vector of samples to be grabbed from Python. More...

class	probe_signal_vs
	Sink that allows a vector of samples to be grabbed from Python. More...

class	random_pdu
	Sends a random PDU at intervals. More...

class	regenerate_bb
	Detect the peak of a signal and repeat every period samples. More...

class	repack_bits_bb
	Repack `k` bits from the input stream onto `l` bits of the output stream. More...

class	repeat
	repeat each input `repeat` times More...

class	rms_cf
	RMS average power. More...

class	rms_ff
	RMS average power. More...

class	rotator

class	rotator_cc
	Complex rotator. More...

class	sample_and_hold_bb
	sample and hold circuit More...

class	sample_and_hold_ff
	sample and hold circuit More...

class	sample_and_hold_ii
	sample and hold circuit More...

class	sample_and_hold_ss
	sample and hold circuit More...

class	short_to_char
	Convert stream of shorts to a stream of chars. More...

class	short_to_float
	Convert stream of shorts to a stream of floats. More...

class	skiphead
	skips the first N items, from then on copies items to the output More...

class	socket_pdu
	Creates socket interface and translates traffic to PDUs. More...

class	stream_mux
	Stream muxing block to multiplex many streams into one with a specified format. More...

class	stream_to_streams
	convert a stream of items into a N streams of items More...

class	stream_to_tagged_stream
	Converts a regular stream into a tagged stream.All this block does is add length tags in regular intervals. It can be used to connect a regular stream to a gr::tagged_stream_block. More...

class	stream_to_vector
	convert a stream of items into a stream of gnuradio/blocks containing nitems_per_block More...

class	streams_to_stream
	Convert N streams of 1 item into a 1 stream of N items. More...

class	streams_to_vector
	convert N streams of items to 1 stream of vector length N More...

class	stretch_ff
	adjust y-range of an input vector by mapping to range (max-of-input, stipulated-min). Primarily for spectral signature matching by normalizing spectrum dynamic ranges. More...

class	sub_cc
	output = input_0 - input_1 - ...) More...

class	sub_ff
	output = input_0 - input_1 - ...) More...

class	sub_ii
	output = input_0 - input_1 - ...) More...

class	sub_ss
	output = input_0 - input_1 - ...) More...

class	tag_debug
	Bit bucket that prints out any tag received. More...

class	tag_gate
	Control tag propagation.Use this block to stop tags from propagating. More...

class	tagged_file_sink
	A file sink that uses tags to save files. More...

class	tagged_stream_align
	Align a stream to a tagged stream item. More...

class	tagged_stream_multiply_length
	Allows scaling of a tagged stream length tag. More...

class	tagged_stream_mux
	Combines tagged streams. More...

class	tagged_stream_to_pdu
	Turns received stream data and tags into PDUs and sends them through a message port.The sent message is a PMT-pair (created by pmt::cons()). The first element is a dictionary containing all the tags. The second is a vector containing the actual data. More...

class	tags_strobe
	Send tags at defined interval. More...

class	threshold_ff
	Output a 1 or zero based on a threshold value. More...

class	throttle
	throttle flow of samples such that the average rate does not exceed samples_per_sec. More...

class	transcendental
	A block that performs various transcendental math operations. More...

class	tsb_vector_sink_b
	A vector sink for tagged streams. More...

class	tsb_vector_sink_c
	A vector sink for tagged streams. More...

class	tsb_vector_sink_f
	A vector sink for tagged streams. More...

class	tsb_vector_sink_i
	A vector sink for tagged streams. More...

class	tsb_vector_sink_s
	A vector sink for tagged streams. More...

class	tuntap_pdu
	Creates TUNTAP interface and translates traffic to PDUs. More...

class	uchar_to_float
	Convert stream of unsigned chars to a stream of floats. More...

class	udp_sink
	Write stream to an UDP socket. More...

class	udp_source
	Read stream from an UDP socket. More...

class	unpack_k_bits_bb
	Converts a byte with k relevent bits to k output bytes with 1 bit in the LSB. More...

class	unpacked_to_packed_bb
	Convert a stream of unpacked bytes or shorts into a stream of packed bytes or shorts. More...

class	unpacked_to_packed_ii
	Convert a stream of unpacked bytes or shorts into a stream of packed bytes or shorts. More...

class	unpacked_to_packed_ss
	Convert a stream of unpacked bytes or shorts into a stream of packed bytes or shorts. More...

class	vco_c
	VCO - Voltage controlled oscillator. More...

class	vco_f
	VCO - Voltage controlled oscillator. More...

class	vector_insert_b
	source of unsigned char's that gets its data from a vector More...

class	vector_insert_c
	source of gr_complex's that gets its data from a vector More...

class	vector_insert_f
	source of float's that gets its data from a vector More...

class	vector_insert_i
	source of int's that gets its data from a vector More...

class	vector_insert_s
	source of short's that gets its data from a vector More...

class	vector_map
	Maps elements from a set of input vectors to a set of output vectors. More...

class	vector_sink_b
	unsigned char sink that writes to a vector More...

class	vector_sink_c
	gr_complex sink that writes to a vector More...

class	vector_sink_f
	float sink that writes to a vector More...

class	vector_sink_i
	int sink that writes to a vector More...

class	vector_sink_s
	short sink that writes to a vector More...

class	vector_source_b
	Source that streams unsigned char items based on the input `data` vector. More...

class	vector_source_c
	Source that streams gr_complex items based on the input `data` vector. More...

class	vector_source_f
	Source that streams float items based on the input `data` vector. More...

class	vector_source_i
	Source that streams int items based on the input `data` vector. More...

class	vector_source_s
	Source that streams short items based on the input `data` vector. More...

class	vector_to_stream
	convert a stream of gnuradio/blocks of nitems_per_block items into a stream of items More...

class	vector_to_streams
	Convert 1 stream of vectors of length N to N streams of items. More...

class	wavfile_sink
	Write stream to a Microsoft PCM (.wav) file. More...

class	wavfile_source
	Read stream from a Microsoft PCM (.wav) file, output floats. More...

class	xor_bb
	output = input_0 ^ input_1 ^ , ... ^ input_N)Bitwise boolean xor across all input streams. More...

class	xor_ii
	output = input_0 ^ input_1 ^ , ... ^ input_N)Bitwise boolean xor across all input streams. More...

class	xor_ss
	output = input_0 ^ input_1 ^ , ... ^ input_N)Bitwise boolean xor across all input streams. More...

Enumerations
enum	gr_file_types { GR_FILE_BYTE =0, GR_FILE_CHAR =0, GR_FILE_SHORT =1, GR_FILE_INT, GR_FILE_LONG, GR_FILE_LONG_LONG, GR_FILE_FLOAT, GR_FILE_DOUBLE }

enum	message_strobe_random_distribution_t { STROBE_POISSON =1, STROBE_GAUSSIAN =2, STROBE_UNIFORM =3 }

Functions
static float	tanhf_lut (float x)

BLOCKS_API unsigned int	count_bits8 (unsigned int x)
	return number of set bits in the low 8 bits of x More...

BLOCKS_API unsigned int	count_bits16 (unsigned int x)
	return number of set bits in the low 16 bits of x More...

BLOCKS_API unsigned int	count_bits32 (unsigned int x)
	return number of set bits in the low 32 bits of x More...

BLOCKS_API unsigned int	count_bits64 (unsigned long long int x)
	return number of set bits in a 64-bit word More...

template<unsigned int k>
static int	log2_const ()

template<>
int	log2_const< 1 > ()

template<>
int	log2_const< 2 > ()

template<>
int	log2_const< 4 > ()

template<>
int	log2_const< 8 > ()

template<>
int	log2_const< 16 > ()

template<>
int	log2_const< 32 > ()

template<>
int	log2_const< 64 > ()

template<>
int	log2_const< 128 > ()

template<>
int	log2_const< 256 > ()

template<>
int	log2_const< 512 > ()

template<>
int	log2_const< 1024 > ()

BLOCKS_API bool	wavheader_parse (FILE *fp, unsigned int &sample_rate, int &nchans, int &bytes_per_sample, int &first_sample_pos, unsigned int &samples_per_chan)
	Read signal information from a given WAV file. More...

BLOCKS_API short int	wav_read_sample (FILE *fp, int bytes_per_sample)
	Read one sample from an open WAV file at the current position. More...

BLOCKS_API bool	wavheader_write (FILE *fp, unsigned int sample_rate, int nchans, int bytes_per_sample)
	Write a valid RIFF file header. More...

BLOCKS_API void	wav_write_sample (FILE *fp, short int sample, int bytes_per_sample)
	Write one sample to an open WAV file at the current position. More...

BLOCKS_API bool	wavheader_complete (FILE *fp, unsigned int byte_count)
	Complete a WAV header. More...

Variables
static float	tanh_lut_table [256]

const char	METADATA_VERSION = 0

const size_t	METADATA_HEADER_SIZE = 149

Enumeration Type Documentation

enum gr::blocks::gr_file_types

Enumerator
GR_FILE_BYTE
GR_FILE_CHAR
GR_FILE_SHORT
GR_FILE_INT
GR_FILE_LONG
GR_FILE_LONG_LONG
GR_FILE_FLOAT
GR_FILE_DOUBLE

enum gr::blocks::message_strobe_random_distribution_t

Enumerator
STROBE_POISSON
STROBE_GAUSSIAN
STROBE_UNIFORM

Function Documentation

BLOCKS_API unsigned int gr::blocks::count_bits16 ( unsigned int x )

return number of set bits in the low 16 bits of x

BLOCKS_API unsigned int gr::blocks::count_bits32 ( unsigned int x )

return number of set bits in the low 32 bits of x

BLOCKS_API unsigned int gr::blocks::count_bits64 ( unsigned long long int x )

return number of set bits in a 64-bit word

BLOCKS_API unsigned int gr::blocks::count_bits8 ( unsigned int x )

return number of set bits in the low 8 bits of x

template<unsigned int k>

static int gr::blocks::log2_const ( )

inlinestatic

template<>

int gr::blocks::log2_const< 1 > ( )

inline

template<>

int gr::blocks::log2_const< 1024 > ( )

inline

template<>

int gr::blocks::log2_const< 128 > ( )

inline

template<>

int gr::blocks::log2_const< 16 > ( )

inline

template<>

int gr::blocks::log2_const< 2 > ( )

inline

template<>

int gr::blocks::log2_const< 256 > ( )

inline

template<>

int gr::blocks::log2_const< 32 > ( )

inline

template<>

int gr::blocks::log2_const< 4 > ( )

inline

template<>

int gr::blocks::log2_const< 512 > ( )

inline

template<>

int gr::blocks::log2_const< 64 > ( )

inline

template<>

int gr::blocks::log2_const< 8 > ( )

inline

static float gr::blocks::tanhf_lut ( float x )

inlinestatic

A look-up table (LUT) tanh calcuation. This function returns an estimate to tanh(x) based on a 256-point LUT between -2 and

If x < -2, it returns -1; if > 2, it retursn 1.

This LUT form of the tanh is "hidden" in this code because it is likely too coarse an estimate for any real uses of a tanh. It is useful, however, in certain control loop applications where the input is expected to be within these bounds and the noise will be greater than the quanitzation of this small LUT. For more accurate forms of tanh, see volk_32f_tanh_32f.

References tanh_lut_table.

BLOCKS_API short int gr::blocks::wav_read_sample	(	FILE *	fp,
		int	bytes_per_sample
	)

Read one sample from an open WAV file at the current position.

Takes care of endianness.

BLOCKS_API void gr::blocks::wav_write_sample	(	FILE *	fp,
		short int	sample,
		int	bytes_per_sample
	)

Write one sample to an open WAV file at the current position.

Takes care of endianness.

BLOCKS_API bool gr::blocks::wavheader_complete	(	FILE *	fp,
		unsigned int	byte_count
	)

Complete a WAV header.

Note: The stream position is changed during this function. If anything needs to be written to the WAV file after calling this function (which shouldn't happen), you need to fseek() to the end of the file (or whereever).

Parameters

[in]	fp	File pointer to an open WAV file with a blank header
[in]	byte_count	Length of all samples written to the file in bytes.

BLOCKS_API bool gr::blocks::wavheader_parse	(	FILE *	fp,
		unsigned int &	sample_rate,
		int &	nchans,
		int &	bytes_per_sample,
		int &	first_sample_pos,
		unsigned int &	samples_per_chan
	)

Read signal information from a given WAV file.

Parameters

[in]	fp	File pointer to an opened, empty file.
[out]	sample_rate	Stores the sample rate [S/s]
[out]	nchans	Number of channels
[out]	bytes_per_sample	Bytes per sample, can either be 1 or 2 (corresponding o 8 or 16 bit samples, respectively)
[out]	first_sample_pos	Number of the first byte containing a sample. Use this with fseek() to jump from the end of the file to the first sample when in repeat mode.
[out]	samples_per_chan	Number of samples per channel

Returns: True on a successful read, false if the file could not be read or is not a valid WAV file.

BLOCKS_API bool gr::blocks::wavheader_write	(	FILE *	fp,
		unsigned int	sample_rate,
		int	nchans,
		int	bytes_per_sample
	)

Write a valid RIFF file header.

Note: Some header values are kept blank because they're usually not known a-priori (file and chunk lengths). Use gri_wavheader_complete() to fill these in.

Variable Documentation

const size_t gr::blocks::METADATA_HEADER_SIZE = 149

const char gr::blocks::METADATA_VERSION = 0

float gr::blocks::tanh_lut_table[256]

static

Referenced by tanhf_lut().

Namespaces

Classes

Enumerations

Functions

Variables

Enumeration Type Documentation

Function Documentation

Variable Documentation