S H O W S T R E A M T I T L E Show artist and songtitle if present in metadata. Show always if full=true. Returns true if title has changed.

S S C O N V Convert an array with 4 "synchsafe integers" to a number. There are 7 bits used per byte.

S T O P _ M P 3 C L I E N T Disconnect from the server.

U P D A T E N R Used by nextPreset because update for preset and playlist number is about the same. Modify the pnr, handle over- and underflow. handl

* Function: AACDecoder_FreeBuffers * * Description: allocate all the memory needed for the AAC decoder * * Inputs: none * * Outputs:

* Function: AACFindSyncWord * * Description: locate the next byte-alinged sync word in the raw AAC stream * * Inputs: buffer to search for

0-unknown 1-ADTS 2-ADIF, 3-RAW

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* Function: DCT4 * * Description: type-IV DCT * * Inputs: table index (for transform size) * buffer of nmdct samples *

* Function: DecodeICSInfo * * Description: decode individual channel stream info * * Inputs: sample rate index * * Outputs: updated

* Function: DecodeNextElement * * Description: decode next syntactic element in AAC frame * * Inputs: double pointer to buffer containing

* Function: DecodeNoiselessData * * Description: decode noiseless data (side info and transform coefficients) * * Inputs: double pointer t

* Function: DecodeProgramConfigElement * * Description: decode one PCE * * Inputs: none * * Outputs: filled-in ProgConfigElement_t s

* Function: DequantBlock * * Description: Ken's highly-optimized, low memory dequantizer performing the operation * y = pow(x, 4

* Function: FindFreq * * Description: search buffer of uint8_ts for a specific value * * Inputs: buffer of elements to search *

* Function: GenerateNoiseVector * * Description: create vector of noise coefficients for one scalefactor band * * Inputs: seed for number

D S P _U P D A T E _ L I N E Show a selected line

* Function: MP3Decoder_ClearBuffer * * Description: clear all the memory needed for the MP3 decoder * * Inputs: none * * Outputs:

* Function: MP3FindSyncWord * * Description: locate the next byte-alinged sync word in the raw mp3 stream * * Inputs: buffer to search

* Function: MP3GetLastFrameInfo * * Description: get info about last MP3 frame decoded (number of sampled decoded, * sample ra

* Function: R4Core * * Description: radix-4 pass for decimation-in-time FFT * * Inputs: buffer of samples * number of R4 but

* Function: R4FFT * * Description: Ken's very fast in-place radix-4 decimation-in-time FFT * * Inputs: table index (for transform size) *

* Function: RatioPowInv * * Description: use Taylor (MacLaurin) series expansion to calculate (a/b) ^ (1/c) * * Inputs: a = [1, 64], b = [

* Function: RefillBitstreamCache * * Description: read new data from bitstream buffer into 32-bit cache * * Inputs: none * * Outputs:

* Function: RemoveFreq * * Description: remove one element from a buffer of uint8_ts * * Inputs: buffer of elements * number

* Function: SetRawBlockParams * * Description: set internal state variables for decoding a stream of raw data blocks * * Inputs: flag indicati

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* Function: UnpackPairsEsc * * Description: decode a section of 2-way vector Huffman coded coefficients, * using esc table (11)

* Function: UnpackPairsNoEsc * * Description: decode a section of 2-way vector Huffman coded coefficients, * using non-esc tables

* Function: UnpackQuads * * Description: decode a section of 4-way vector Huffman coded coefficients * * Inputs index of Huffman codebook

O L E D :: C L E A R Clear the display buffer and the display.

C O N N E C T T O F I L E Connect to USB or SD file.

C O N N E C T T O F I L E _ S D Open the local mp3-file.

C O N N E C T T O H O S T Connect to the Internet radio server specified by newpreset.

Test communication with module

D I S P L A Y B A T T E R Y Show the current battery charge level on the screen. It will overwrite the top divider. No action if bat0/bat100 not defi

D I S P L A Y V O L U M E Show the current volume as an indicator on the screen. The indicator is 2 pixels heigh.

D S P _U P D A T E _ L I N E Show a selected line

F I L L K E Y L I S T File the list of all relevant keys in NVS. The keys will be sorted.

F I L L K E Y L I S T File the list of all relevant keys in NVS. The keys will be sorted.

G E T _ F S _ N O D E C O U N T Return the number of nodes on USB/SD.

G E T T I M E Retrieve the local time from NTP server and convert to string. Will be called every second.

G E T T I M E Retrieve the local time from NTP server and convert to string. Will be called every second.

H E L I X I N I T Initialize helix buffering.

require at least 3 guard bits in x[] to ensure no overflow */

L I S T S D T R A C K S Search all MP3 files on directory of SD card. Return the number of files found. A "node" of max. 4 levels ( the subdirectory

L I S T U S B T R A C K S Search all MP3 files on directory of USB drive. Return the number of files found. A "node" of max. 4 levels ( the subdirec

M O U N T _ S D C A R D Initialize the SD card.

P L A Y E R _ G E T V O L U M E Get volume percentage.

P L A Y E R _ S E T V O L U M E Set volume percentage.

L C D 2 0 0 4 :: P R I N T Put a character in the buffer.

Q U E U E F U N C Queue a special function for the play task.

R A D I O F U N C S Handles commands for the connection to a icecast server. Commands are received in the input queue. Data from the server is handle

R E A D P R E F S Read the preferences and interpret the commands. If output == true, the key / value pairs are returned to the caller as a String.

R E A D P R E F S Read the preferences and interpret the commands. If output == true, the key / value pairs are returned to the caller as a String.

R I N B Y T Read next byte from http inputbuffer. Buffered for speed reasons.

S C A N _ C O N T E N T _ L E N G T H If the line contains content-length information: set clength (content length counter).

S D F U N C S Handles data of SD card and commands in the sdqueue. Commands are received in the input queue.

U P D A T E _ S O F T W A R E Update software by download from remote host.

U T F 8 A S C I I UTF8-Decoder: convert UTF8-string to extended ASCII. Convert a single Character from UTF8 to Extended ASCII. Return "0" if a byte h

* Function: AACDecode * * Description: decode AAC frame * * Inputs: double pointer to buffer of AAC data * pointer to number

* Function: AACDecoder_AllocateBuffers * * Description: allocate all the memory needed for the AAC decoder * try heap first, becaus

* Function: AACDequantize * * Description: dequantize all transform coefficients for one channel * * Inputs: index of current channel *

* Function: AdjustHighFreq * * Description: adjust high frequencies and add noise and sinusoids (4.6.18.7) * * Inputs: initialized SBRHead

* Function: AntiAlias * * Description: smooth transition across DCT block boundaries (every 18 coefficients) * * Inputs: vector of deq

* Function: ApplyBoost * * Description: calculate and apply boost factor for envelope, sinusoids, and noise * in this limiter ban

* Function: BitReverse * * Description: Ken's fast in-place bit reverse, using super-small table * * Inputs: buffer of samples *

* Function: BitReverse32 * * Description: Ken's fast in-place bit reverse * * Inputs: buffer of 32 complex samples * * Outputs: bit-

* Function: BuildPatches * * Description: build high frequency patches (4.6.18.6.3) * * Inputs: master frequency table * num

* Function: CVKernel1 * * Description: kernel of covariance matrix calculation for p01, p11, p12, p22 * * Inputs: buffer of low-freq sampl

* Function: CVKernel2 * * Description: kernel of covariance matrix calculation for p02 * * Inputs: buffer of low-freq samples, starting at

* Function: CalcComponentGains * * Description: calculate gain of envelope, sinusoids, and noise in one limiter band * (4.6.18.7.

* Function: CalcCovariance1 * * Description: calculate covariance matrix for p01, p12, p11, p22 (4.6.18.6.2) * * Inputs: buffer of low-fre

* Function: CalcCovariance2 * * Description: calculate covariance matrix for p02 (4.6.18.6.2) * * Inputs: buffer of low-freq samples, star

* Function: CalcFreqHigh * * Description: calculate high resolution frequency table (4.6.18.3.2.2) * * Inputs: master frequency table *

* Function: CalcFreqLimiter * * Description: calculate limiter frequency table (4.6.18.3.2.3) * * Inputs: number of subbands in each patch

* Function: CalcFreqLow * * Description: calculate low resolution frequency table (4.6.18.3.2.2) * * Inputs: high resolution frequency tab

* Function: CalcFreqMasterScale * * Description: calculate master frequency table when freqScale > 0 * (4.6.18.3.2.1, figure 4.39

* Function: CalcFreqMasterScaleZero * * Description: calculate master frequency table when freqScale == 0 * (4.6.18.3.2.1, figure

* Function: CalcFreqNoise * * Description: calculate noise floor frequency table (4.6.18.3.2.2) * * Inputs: low resolution frequency table

* Function: CalcFreqTables * * Description: calulate master and derived frequency tables, and patches * * Inputs: initialized SBRHeader st

* Function: CalcGain * * Description: calculate and apply proper gain to HF components in one envelope * (4.6.18.7.5) * * Input

* Function: CalcLPCoefs * * Description: calculate linear prediction coefficients for one subband (4.6.18.6.2) * * Inputs: buffer of low-f

* Function: CalcMaxGain * * Description: calculate max gain in one limiter band (4.6.18.7.5) * * Inputs: initialized SBRHeader struct for

* Function: CalcNoiseDivFactors * * Description: calculate 1/(1+Q) and Q/(1+Q) (4.6.18.7.4; 4.6.18.7.5) * * Inputs: dequantized noise floo

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* Function: CopyCouplingGrid * * Description: copy grid parameters from left to right for channel coupling * * Inputs: initialized SBRGrid

* Function: CopyCouplingInverseFilterMode * * Description: copy invf flags from left to right for channel coupling * * Inputs: invf flags

* Function: CopyNoiseVector * * Description: copy vector of noise coefficients for one scalefactor band from L to R * * Inputs: buffer of

* Function: DecWindowOverlap * * Description: apply synthesis window, do overlap-add, clip to 16-bit PCM, * for winSequence LONG-