hdcd_state Struct Reference

Public Attributes
uint64_t	window
unsigned char	readahead
uint8_t	arg
	arg is set when a packet prefix is found. More...
uint8_t	control
unsigned int	sustain
unsigned int	sustain_reset
	code detect timer
int	running_gain
	11-bit (3.8) fixed point, extended from target_gain
int	code_counterA
	8-bit format packet
int	code_counterA_almost
	looks like an A code, but a bit expected to be 0 is 1
int	code_counterB
	16-bit format packet, 8-bit code, 8-bit XOR of code
int	code_counterB_checkfails
	looks like a B code, but doesn't pass the XOR check
int	code_counterC
	packet prefix was found, expect a code
int	code_counterC_unmatched
	told to look for a code, but didn't find one
int	count_peak_extend
	valid packets where peak_extend was enabled
int	count_transient_filter
	valid packets where filter was detected
int	gain_counts [16]
	target_gain is a 4-bit (3.1) fixed-point value, always negative, but stored positive. More...
int	max_gain
int	count_sustain_expired
	occurrences of code detect timer expiring without detecting a code. More...
int	rate
	sampling rate
int	_ana_snb
	used in the analyze mode tone generator

Member Data Documentation

arg

uint8_t hdcd_state::arg

arg is set when a packet prefix is found.

control is the active control code, where bit 0-3: target_gain, 4-bit (3.1) fixed-point value bit 4 : peak_extend bit 5 : transient_filter bit 6,7: always zero

count_sustain_expired

int hdcd_state::count_sustain_expired

occurrences of code detect timer expiring without detecting a code.

-1 for timer never set.

gain_counts

int hdcd_state::gain_counts[16]

target_gain is a 4-bit (3.1) fixed-point value, always negative, but stored positive.

The 16 possible values range from -7.5 to 0.0 dB in steps of 0.5, but no value below -6.0 dB should appear.

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

• libavfilter/af_hdcd.c