#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "internal.h"
#include "mathops.h"
#include "audio_frame_queue.h"

Data Structures
struct	FilterSignal

struct	QMFAnalysis

struct	Quantize

struct	InvertQuantize

struct	Prediction

struct	Channel

struct	AptXContext

struct	ConstTables

Macros
#define	NB_FILTERS 2

#define	FILTER_TAPS 16

#define	RSHIFT_SIZE(size)

Enumerations
enum	channels { LEFT, RIGHT, NB_CHANNELS }

enum	subbands { LF, MLF, MHF, HF, NB_SUBBANDS }

Functions
static av_always_inline void	aptx_update_codeword_history (Channel *channel)

static void	aptx_generate_dither (Channel *channel)

static av_always_inline void	aptx_qmf_filter_signal_push (FilterSignal *signal, int32_t sample)

static av_always_inline int32_t	aptx_qmf_convolution (FilterSignal *signal, const int32_t coeffs[FILTER_TAPS], int shift)

static av_always_inline void	aptx_qmf_polyphase_analysis (FilterSignal signal[NB_FILTERS], const int32_t coeffs[NB_FILTERS][FILTER_TAPS], int shift, int32_t samples[NB_FILTERS], int32_t low_subband_output, int32_t high_subband_output)

static void	aptx_qmf_tree_analysis (QMFAnalysis *qmf, int32_t samples[4], int32_t subband_samples[4])

static av_always_inline void	aptx_qmf_polyphase_synthesis (FilterSignal signal[NB_FILTERS], const int32_t coeffs[NB_FILTERS][FILTER_TAPS], int shift, int32_t low_subband_input, int32_t high_subband_input, int32_t samples[NB_FILTERS])

static void	aptx_qmf_tree_synthesis (QMFAnalysis *qmf, int32_t subband_samples[4], int32_t samples[4])

static av_always_inline int32_t	aptx_bin_search (int32_t value, int32_t factor, const int32_t *intervals, int32_t nb_intervals)

static void	aptx_quantize_difference (Quantize quantize, int32_t sample_difference, int32_t dither, int32_t quantization_factor, ConstTables tables)

static void	aptx_encode_channel (Channel *channel, int32_t samples[4], int hd)

static void	aptx_decode_channel (Channel *channel, int32_t samples[4])

static void	aptx_invert_quantization (InvertQuantize invert_quantize, int32_t quantized_sample, int32_t dither, ConstTables tables)

static int32_t *	aptx_reconstructed_differences_update (Prediction *prediction, int32_t reconstructed_difference, int order)

static void	aptx_prediction_filtering (Prediction *prediction, int32_t reconstructed_difference, int order)

static void	aptx_process_subband (InvertQuantize invert_quantize, Prediction prediction, int32_t quantized_sample, int32_t dither, ConstTables *tables)

static void	aptx_invert_quantize_and_prediction (Channel *channel, int hd)

static int32_t	aptx_quantized_parity (Channel *channel)

static int	aptx_check_parity (Channel channels[NB_CHANNELS], int32_t *idx)

static void	aptx_insert_sync (Channel channels[NB_CHANNELS], int32_t *idx)

static uint16_t	aptx_pack_codeword (Channel *channel)

static uint32_t	aptxhd_pack_codeword (Channel *channel)

static void	aptx_unpack_codeword (Channel *channel, uint16_t codeword)

static void	aptxhd_unpack_codeword (Channel *channel, uint32_t codeword)

static void	aptx_encode_samples (AptXContext ctx, int32_t samples[NB_CHANNELS][4], uint8_t output)

static int	aptx_decode_samples (AptXContext ctx, const uint8_t input, int32_t samples[NB_CHANNELS][4])

static av_cold int	aptx_init (AVCodecContext *avctx)

static int	aptx_decode_frame (AVCodecContext avctx, void data, int got_frame_ptr, AVPacket avpkt)

static int	aptx_encode_frame (AVCodecContext avctx, AVPacket avpkt, const AVFrame frame, int got_packet_ptr)

static av_cold int	aptx_close (AVCodecContext *avctx)

Variables
static const int32_t	quantize_intervals_LF [65]

static const int32_t	invert_quantize_dither_factors_LF [65]

static const int32_t	quantize_dither_factors_LF [65]

static const int16_t	quantize_factor_select_offset_LF [65]

static const int32_t	quantize_intervals_MLF [9]

static const int32_t	invert_quantize_dither_factors_MLF [9]

static const int32_t	quantize_dither_factors_MLF [9]

static const int16_t	quantize_factor_select_offset_MLF [9]

static const int32_t	quantize_intervals_MHF [3]

static const int32_t	invert_quantize_dither_factors_MHF [3]

static const int32_t	quantize_dither_factors_MHF [3]

static const int16_t	quantize_factor_select_offset_MHF [3]

static const int32_t	quantize_intervals_HF [5]

static const int32_t	invert_quantize_dither_factors_HF [5]

static const int32_t	quantize_dither_factors_HF [5]

static const int16_t	quantize_factor_select_offset_HF [5]

static const int32_t	hd_quantize_intervals_LF [257]

static const int32_t	hd_invert_quantize_dither_factors_LF [257]

static const int32_t	hd_quantize_dither_factors_LF [256]

static const int16_t	hd_quantize_factor_select_offset_LF [257]

static const int32_t	hd_quantize_intervals_MLF [33]

static const int32_t	hd_invert_quantize_dither_factors_MLF [33]

static const int32_t	hd_quantize_dither_factors_MLF [32]

static const int16_t	hd_quantize_factor_select_offset_MLF [33]

static const int32_t	hd_quantize_intervals_MHF [9]

static const int32_t	hd_invert_quantize_dither_factors_MHF [9]

static const int32_t	hd_quantize_dither_factors_MHF [8]

static const int16_t	hd_quantize_factor_select_offset_MHF [9]

static const int32_t	hd_quantize_intervals_HF [17]

static const int32_t	hd_invert_quantize_dither_factors_HF [17]

static const int32_t	hd_quantize_dither_factors_HF [16]

static const int16_t	hd_quantize_factor_select_offset_HF [17]

static ConstTables	tables [2][NB_SUBBANDS]

static const int16_t	quantization_factors [32]

static const int32_t	aptx_qmf_outer_coeffs [NB_FILTERS][FILTER_TAPS]

static const int32_t	aptx_qmf_inner_coeffs [NB_FILTERS][FILTER_TAPS]

Macro Definition Documentation

◆ NB_FILTERS

#define NB_FILTERS 2

Definition at line 44 of file aptx.c.

◆ FILTER_TAPS

#define FILTER_TAPS 16

Definition at line 45 of file aptx.c.

◆ RSHIFT_SIZE

#define RSHIFT_SIZE ( size )

Value:

av_always_inline                                                              \
static int##size##_t rshift##size(int##size##_t value, int shift)             \
{                                                                             \
    int##size##_t rounding = (int##size##_t)1 << (shift - 1);                 \
    int##size##_t mask = ((int##size##_t)1 << (shift + 1)) - 1;               \
    return ((value + rounding) >> shift) - ((value & mask) == rounding);      \
}                                                                             \
av_always_inline                                                              \
static int##size##_t rshift##size##_clip24(int##size##_t value, int shift)    \
{                                                                             \
    return av_clip_intp2(rshift##size(value, shift), 23);                     \
}

Definition at line 460 of file aptx.c.

Enumeration Type Documentation

◆ channels

enum channels

Enumerator
LEFT
RIGHT
NB_CHANNELS

Examples: filter_audio.c.

Definition at line 30 of file aptx.c.

◆ subbands

enum subbands

Enumerator
LF
MLF
MHF
HF
NB_SUBBANDS

Definition at line 36 of file aptx.c.

Function Documentation

◆ aptx_update_codeword_history()

static av_always_inline void aptx_update_codeword_history ( Channel * channel )

static

Definition at line 478 of file aptx.c.

Referenced by aptx_generate_dither().

◆ aptx_generate_dither()

static void aptx_generate_dither ( Channel * channel )

static

Definition at line 486 of file aptx.c.

Referenced by aptx_decode_samples(), and aptx_encode_channel().

◆ aptx_qmf_filter_signal_push()

static av_always_inline void aptx_qmf_filter_signal_push	(	FilterSignal *	signal,
		int32_t	sample
	)

static

Definition at line 535 of file aptx.c.

Referenced by aptx_qmf_polyphase_analysis(), and aptx_qmf_polyphase_synthesis().

◆ aptx_qmf_convolution()

static av_always_inline int32_t aptx_qmf_convolution	(	FilterSignal *	signal,
		const int32_t	coeffs[FILTER_TAPS],
		int	shift
	)

static

Definition at line 547 of file aptx.c.

Referenced by aptx_qmf_polyphase_analysis(), and aptx_qmf_polyphase_synthesis().

◆ aptx_qmf_polyphase_analysis()

static av_always_inline void aptx_qmf_polyphase_analysis	(	FilterSignal	signal[NB_FILTERS],
		const int32_t	coeffs[NB_FILTERS][FILTER_TAPS],
		int	shift,
		int32_t	samples[NB_FILTERS],
		int32_t *	low_subband_output,
		int32_t *	high_subband_output
	)

static

Definition at line 568 of file aptx.c.

Referenced by aptx_qmf_tree_analysis().

◆ aptx_qmf_tree_analysis()

static void aptx_qmf_tree_analysis	(	QMFAnalysis *	qmf,
		int32_t	samples[4],
		int32_t	subband_samples[4]
	)

static

Definition at line 593 of file aptx.c.

Referenced by aptx_encode_channel().

◆ aptx_qmf_polyphase_synthesis()

static av_always_inline void aptx_qmf_polyphase_synthesis	(	FilterSignal	signal[NB_FILTERS],
		const int32_t	coeffs[NB_FILTERS][FILTER_TAPS],
		int	shift,
		int32_t	low_subband_input,
		int32_t	high_subband_input,
		int32_t	samples[NB_FILTERS]
	)

static

Definition at line 623 of file aptx.c.

Referenced by aptx_qmf_tree_synthesis().

◆ aptx_qmf_tree_synthesis()

static void aptx_qmf_tree_synthesis	(	QMFAnalysis *	qmf,
		int32_t	subband_samples[4],
		int32_t	samples[4]
	)

static

Definition at line 647 of file aptx.c.

Referenced by aptx_decode_channel().

◆ aptx_bin_search()

static av_always_inline int32_t aptx_bin_search	(	int32_t	value,
		int32_t	factor,
		const int32_t *	intervals,
		int32_t	nb_intervals
	)

static

Definition at line 673 of file aptx.c.

Referenced by aptx_quantize_difference().

◆ aptx_quantize_difference()

static void aptx_quantize_difference	(	Quantize *	quantize,
		int32_t	sample_difference,
		int32_t	dither,
		int32_t	quantization_factor,
		ConstTables *	tables
	)

static

Definition at line 686 of file aptx.c.

Referenced by aptx_encode_channel().

◆ aptx_encode_channel()

static void aptx_encode_channel	(	Channel *	channel,
		int32_t	samples[4],
		int	hd
	)

static

Definition at line 726 of file aptx.c.

Referenced by aptx_encode_samples().

◆ aptx_decode_channel()

static void aptx_decode_channel	(	Channel *	channel,
		int32_t	samples[4]
	)

static

Definition at line 741 of file aptx.c.

Referenced by aptx_decode_samples().

◆ aptx_invert_quantization()

static void aptx_invert_quantization	(	InvertQuantize *	invert_quantize,
		int32_t	quantized_sample,
		int32_t	dither,
		ConstTables *	tables
	)

static

Definition at line 751 of file aptx.c.

Referenced by aptx_process_subband().

◆ aptx_reconstructed_differences_update()

static int32_t* aptx_reconstructed_differences_update	(	Prediction *	prediction,
		int32_t	reconstructed_difference,
		int	order
	)

static

Definition at line 776 of file aptx.c.

Referenced by aptx_prediction_filtering().

◆ aptx_prediction_filtering()

static void aptx_prediction_filtering	(	Prediction *	prediction,
		int32_t	reconstructed_difference,
		int	order
	)

static

Definition at line 789 of file aptx.c.

Referenced by aptx_process_subband().

◆ aptx_process_subband()

static void aptx_process_subband	(	InvertQuantize *	invert_quantize,
		Prediction *	prediction,
		int32_t	quantized_sample,
		int32_t	dither,
		ConstTables *	tables
	)

static

Definition at line 815 of file aptx.c.

Referenced by aptx_invert_quantize_and_prediction().

◆ aptx_invert_quantize_and_prediction()

static void aptx_invert_quantize_and_prediction	(	Channel *	channel,
		int	hd
	)

static

Definition at line 848 of file aptx.c.

Referenced by aptx_decode_samples(), and aptx_encode_samples().

◆ aptx_quantized_parity()

static int32_t aptx_quantized_parity ( Channel * channel )

static

Definition at line 859 of file aptx.c.

Referenced by aptx_check_parity(), aptx_pack_codeword(), aptx_unpack_codeword(), aptxhd_pack_codeword(), and aptxhd_unpack_codeword().

◆ aptx_check_parity()

static int aptx_check_parity	(	Channel	channels[NB_CHANNELS],
		int32_t *	idx
	)

static

Definition at line 872 of file aptx.c.

Referenced by aptx_decode_samples(), and aptx_insert_sync().

◆ aptx_insert_sync()

static void aptx_insert_sync	(	Channel	channels[NB_CHANNELS],
		int32_t *	idx
	)

static

Definition at line 883 of file aptx.c.

Referenced by aptx_encode_samples().

◆ aptx_pack_codeword()

static uint16_t aptx_pack_codeword ( Channel * channel )

static

Definition at line 901 of file aptx.c.

Referenced by aptx_encode_samples().

◆ aptxhd_pack_codeword()

static uint32_t aptxhd_pack_codeword ( Channel * channel )

static

Definition at line 910 of file aptx.c.

Referenced by aptx_encode_samples().

◆ aptx_unpack_codeword()

static void aptx_unpack_codeword	(	Channel *	channel,
		uint16_t	codeword
	)

static

Definition at line 919 of file aptx.c.

Referenced by aptx_decode_samples().

◆ aptxhd_unpack_codeword()

static void aptxhd_unpack_codeword	(	Channel *	channel,
		uint32_t	codeword
	)

static

Definition at line 929 of file aptx.c.

Referenced by aptx_decode_samples().

◆ aptx_encode_samples()

static void aptx_encode_samples	(	AptXContext *	ctx,
		int32_t	samples[NB_CHANNELS][4],
		uint8_t *	output
	)

static

Definition at line 939 of file aptx.c.

Referenced by aptx_encode_frame().

◆ aptx_decode_samples()

static int aptx_decode_samples	(	AptXContext *	ctx,
		const uint8_t *	input,
		int32_t	samples[NB_CHANNELS][4]
	)

static

Definition at line 960 of file aptx.c.

Referenced by aptx_decode_frame().

◆ aptx_init()

static av_cold int aptx_init ( AVCodecContext * avctx )

static

Definition at line 987 of file aptx.c.

◆ aptx_decode_frame()

static int aptx_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	got_frame_ptr,
		AVPacket *	avpkt
	)

static

Definition at line 1020 of file aptx.c.

◆ aptx_encode_frame()

static int aptx_encode_frame	(	AVCodecContext *	avctx,
		AVPacket *	avpkt,
		const AVFrame *	frame,
		int *	got_packet_ptr
	)

static

Definition at line 1057 of file aptx.c.

◆ aptx_close()

static av_cold int aptx_close ( AVCodecContext * avctx )

static

Definition at line 1085 of file aptx.c.

Variable Documentation

◆ quantize_intervals_LF

const int32_t quantize_intervals_LF[65]

static

Initial value:

= {
      -9948,    9948,   29860,   49808,   69822,   89926,  110144,  130502,
     151026,  171738,  192666,  213832,  235264,  256982,  279014,  301384,
     324118,  347244,  370790,  394782,  419250,  444226,  469742,  495832,
     522536,  549890,  577936,  606720,  636290,  666700,  698006,  730270,
     763562,  797958,  833538,  870398,  908640,  948376,  989740, 1032874,
    1077948, 1125150, 1174700, 1226850, 1281900, 1340196, 1402156, 1468282,
    1539182, 1615610, 1698514, 1789098, 1888944, 2000168, 2125700, 2269750,
    2438670, 2642660, 2899462, 3243240, 3746078, 4535138, 5664098, 7102424,
    8897462,
}

Definition at line 100 of file aptx.c.

◆ invert_quantize_dither_factors_LF

const int32_t invert_quantize_dither_factors_LF[65]

static

Initial value:

= {
       9948,   9948,   9962,   9988,  10026,  10078,  10142,  10218,
      10306,  10408,  10520,  10646,  10784,  10934,  11098,  11274,
      11462,  11664,  11880,  12112,  12358,  12618,  12898,  13194,
      13510,  13844,  14202,  14582,  14988,  15422,  15884,  16380,
      16912,  17484,  18098,  18762,  19480,  20258,  21106,  22030,
      23044,  24158,  25390,  26760,  28290,  30008,  31954,  34172,
      36728,  39700,  43202,  47382,  52462,  58762,  66770,  77280,
      91642, 112348, 144452, 199326, 303512, 485546, 643414, 794914,
    1000124,
}

Definition at line 111 of file aptx.c.

◆ quantize_dither_factors_LF

const int32_t quantize_dither_factors_LF[65]

static

Initial value:

= {
        0,     4,     7,    10,    13,    16,    19,    22,
       26,    28,    32,    35,    38,    41,    44,    47,
       51,    54,    58,    62,    65,    70,    74,    79,
       84,    90,    95,   102,   109,   116,   124,   133,
      143,   154,   166,   180,   195,   212,   231,   254,
      279,   308,   343,   383,   430,   487,   555,   639,
      743,   876,  1045,  1270,  1575,  2002,  2628,  3591,
     5177,  8026, 13719, 26047, 45509, 39467, 37875, 51303,
        0,
}

Definition at line 122 of file aptx.c.

◆ quantize_factor_select_offset_LF

const int16_t quantize_factor_select_offset_LF[65]

static

Initial value:

= {
      0, -21, -19, -17, -15, -12, -10,  -8,
     -6,  -4,  -1,   1,   3,   6,   8,  10,
     13,  15,  18,  20,  23,  26,  29,  31,
     34,  37,  40,  43,  47,  50,  53,  57,
     60,  64,  68,  72,  76,  80,  85,  89,
     94,  99, 105, 110, 116, 123, 129, 136,
    144, 152, 161, 171, 182, 194, 207, 223,
    241, 263, 291, 328, 382, 467, 522, 522,
    522,
}

Definition at line 133 of file aptx.c.

◆ quantize_intervals_MLF

const int32_t quantize_intervals_MLF[9]

static

Initial value:

= {
    -89806, 89806, 278502, 494338, 759442, 1113112, 1652322, 2720256, 5190186,
}

Definition at line 146 of file aptx.c.

◆ invert_quantize_dither_factors_MLF

const int32_t invert_quantize_dither_factors_MLF[9]

static

Initial value:

= {
    89806, 89806, 98890, 116946, 148158, 205512, 333698, 734236, 1735696,
}

Definition at line 149 of file aptx.c.

◆ quantize_dither_factors_MLF

const int32_t quantize_dither_factors_MLF[9]

static

Initial value:

= {
    0, 2271, 4514, 7803, 14339, 32047, 100135, 250365, 0,
}

Definition at line 152 of file aptx.c.

◆ quantize_factor_select_offset_MLF

const int16_t quantize_factor_select_offset_MLF[9]

static

Initial value:

= {
    0, -14, 6, 29, 58, 96, 154, 270, 521,
}

Definition at line 155 of file aptx.c.

◆ quantize_intervals_MHF

const int32_t quantize_intervals_MHF[3]

static

Initial value:

= {
    -194080, 194080, 890562,
}

Definition at line 160 of file aptx.c.

◆ invert_quantize_dither_factors_MHF

const int32_t invert_quantize_dither_factors_MHF[3]

static

Initial value:

= {
    194080, 194080, 502402,
}

Definition at line 163 of file aptx.c.

◆ quantize_dither_factors_MHF

const int32_t quantize_dither_factors_MHF[3]

static

Initial value:

= {
    0, 77081, 0,
}

Definition at line 166 of file aptx.c.

◆ quantize_factor_select_offset_MHF

const int16_t quantize_factor_select_offset_MHF[3]

static

Initial value:

= {
    0, -33, 136,
}

Definition at line 169 of file aptx.c.

◆ quantize_intervals_HF

const int32_t quantize_intervals_HF[5]

static

Initial value:

= {
    -163006, 163006, 542708, 1120554, 2669238,
}

Definition at line 174 of file aptx.c.

◆ invert_quantize_dither_factors_HF

const int32_t invert_quantize_dither_factors_HF[5]

static

Initial value:

= {
    163006, 163006, 216698, 361148, 1187538,
}

Definition at line 177 of file aptx.c.

◆ quantize_dither_factors_HF

const int32_t quantize_dither_factors_HF[5]

static

Initial value:

= {
    0, 13423, 36113, 206598, 0,
}

Definition at line 180 of file aptx.c.

◆ quantize_factor_select_offset_HF

const int16_t quantize_factor_select_offset_HF[5]

static

Initial value:

= {
    0, -8, 33, 95, 262,
}

Definition at line 183 of file aptx.c.

◆ hd_quantize_intervals_LF

const int32_t hd_quantize_intervals_LF[257]

static

Definition at line 188 of file aptx.c.

◆ hd_invert_quantize_dither_factors_LF

const int32_t hd_invert_quantize_dither_factors_LF[257]

static

Definition at line 223 of file aptx.c.

◆ hd_quantize_dither_factors_LF

const int32_t hd_quantize_dither_factors_LF[256]

static

Definition at line 257 of file aptx.c.

◆ hd_quantize_factor_select_offset_LF

const int16_t hd_quantize_factor_select_offset_LF[257]

static

Definition at line 291 of file aptx.c.

◆ hd_quantize_intervals_MLF

const int32_t hd_quantize_intervals_MLF[33]

static

Initial value:

= {
      -21236,   21236,   63830,  106798,  150386,  194832,  240376,  287258,
      335726,  386034,  438460,  493308,  550924,  611696,  676082,  744626,
      817986,  896968,  982580, 1076118, 1179278, 1294344, 1424504, 1574386,
     1751090, 1966260, 2240868, 2617662, 3196432, 4176450, 5658260, 7671068,
    10380372,
}

Definition at line 327 of file aptx.c.

◆ hd_invert_quantize_dither_factors_MLF

const int32_t hd_invert_quantize_dither_factors_MLF[33]

static

Initial value:

= {
    21236,  21236,  21360,  21608,  21978,  22468,  23076,   23806,
    24660,  25648,  26778,  28070,  29544,  31228,  33158,   35386,
    37974,  41008,  44606,  48934,  54226,  60840,  69320,   80564,
    96140, 119032, 155576, 221218, 357552, 622468, 859344, 1153464, 1555840,
}

Definition at line 334 of file aptx.c.

◆ hd_quantize_dither_factors_MLF

const int32_t hd_quantize_dither_factors_MLF[32]

static

Initial value:

= {
       0,   31,    62,    93,   123,   152,   183,    214,
     247,  283,   323,   369,   421,   483,   557,    647,
     759,  900,  1082,  1323,  1654,  2120,  2811,   3894,
    5723, 9136, 16411, 34084, 66229, 59219, 73530, 100594,
}

Definition at line 340 of file aptx.c.

◆ hd_quantize_factor_select_offset_MLF

const int16_t hd_quantize_factor_select_offset_MLF[33]

static

Initial value:

= {
      0, -21, -16, -12,  -7,  -2,   3,   8,
     13,  19,  24,  30,  36,  43,  50,  57,
     65,  74,  83,  93, 104, 117, 131, 147,
    166, 189, 219, 259, 322, 427, 521, 521, 521,
}

Definition at line 346 of file aptx.c.

◆ hd_quantize_intervals_MHF

const int32_t hd_quantize_intervals_MHF[9]

static

Initial value:

= {
    -95044, 95044, 295844, 528780, 821332, 1226438, 1890540, 3344850, 6450664,
}

Definition at line 354 of file aptx.c.

◆ hd_invert_quantize_dither_factors_MHF

const int32_t hd_invert_quantize_dither_factors_MHF[9]

static

Initial value:

= {
    95044, 95044, 105754, 127180, 165372, 39736, 424366, 1029946, 2075866,
}

Definition at line 357 of file aptx.c.

◆ hd_quantize_dither_factors_MHF

const int32_t hd_quantize_dither_factors_MHF[8]

static

Initial value:

= {
    0, 2678, 5357, 9548, -31409, 96158, 151395, 261480,
}

Definition at line 360 of file aptx.c.

◆ hd_quantize_factor_select_offset_MHF

const int16_t hd_quantize_factor_select_offset_MHF[9]

static

Initial value:

= {
    0, -17, 5, 30, 62, 105, 177, 334, 518,
}

Definition at line 363 of file aptx.c.

◆ hd_quantize_intervals_HF

const int32_t hd_quantize_intervals_HF[17]

static

Initial value:

= {
     -45754,   45754,  138496,  234896,  337336,  448310,  570738,  708380,
     866534, 1053262, 1281958, 1577438, 1993050, 2665984, 3900982, 5902844,
    8897462,
}

Definition at line 368 of file aptx.c.

◆ hd_invert_quantize_dither_factors_HF

const int32_t hd_invert_quantize_dither_factors_HF[17]

static

Initial value:

= {
    45754,  45754,  46988,  49412,  53026,  57950,  64478,   73164,
    84988, 101740, 126958, 168522, 247092, 425842, 809154, 1192708, 1801910,
}

Definition at line 373 of file aptx.c.

◆ hd_quantize_dither_factors_HF

const int32_t hd_quantize_dither_factors_HF[16]

static

Initial value:

= {
       0,  309,   606,   904,  1231,  1632,  2172,   2956,
    4188, 6305, 10391, 19643, 44688, 95828, 95889, 152301,
}

Definition at line 377 of file aptx.c.

◆ hd_quantize_factor_select_offset_HF

const int16_t hd_quantize_factor_select_offset_HF[17]

static

Initial value:

= {
     0, -18,  -8,   2,  13,  25,  38,  53,
    70,  90, 115, 147, 192, 264, 398, 521, 521,
}

Definition at line 381 of file aptx.c.

◆ tables

ConstTables tables[2][NB_SUBBANDS]

static

Definition at line 396 of file aptx.c.

Referenced by aptx_encode_channel(), aptx_invert_quantization(), aptx_invert_quantize_and_prediction(), aptx_process_subband(), and aptx_quantize_difference().

◆ quantization_factors

const int16_t quantization_factors[32]

static

Initial value:

= {
    2048, 2093, 2139, 2186, 2233, 2282, 2332, 2383,
    2435, 2489, 2543, 2599, 2656, 2714, 2774, 2834,
    2896, 2960, 3025, 3091, 3158, 3228, 3298, 3371,
    3444, 3520, 3597, 3676, 3756, 3838, 3922, 4008,
}

Definition at line 451 of file aptx.c.

Referenced by aptx_invert_quantization().

◆ aptx_qmf_outer_coeffs

const int32_t aptx_qmf_outer_coeffs[NB_FILTERS][FILTER_TAPS]

static

Initial value:

= {
    {
        730, -413, -9611, 43626, -121026, 269973, -585547, 2801966,
        697128, -160481, 27611, 8478, -10043, 3511, 688, -897,
    },
    {
        -897, 688, 3511, -10043, 8478, 27611, -160481, 697128,
        2801966, -585547, 269973, -121026, 43626, -9611, -413, 730,
    },
}

Definition at line 505 of file aptx.c.

Referenced by aptx_qmf_tree_analysis(), and aptx_qmf_tree_synthesis().

◆ aptx_qmf_inner_coeffs

const int32_t aptx_qmf_inner_coeffs[NB_FILTERS][FILTER_TAPS]

static

Initial value:

= {
    {
       1033, -584, -13592, 61697, -171156, 381799, -828088, 3962579,
       985888, -226954, 39048, 11990, -14203, 4966, 973, -1268,
    },
    {
      -1268, 973, 4966, -14203, 11990, 39048, -226954, 985888,
      3962579, -828088, 381799, -171156, 61697, -13592, -584, 1033,
    },
}

Definition at line 520 of file aptx.c.

Referenced by aptx_qmf_tree_analysis(), and aptx_qmf_tree_synthesis().

Data Structures

Macros

Enumerations

Functions

Variables

Macro Definition Documentation

◆ NB_FILTERS

◆ FILTER_TAPS

◆ RSHIFT_SIZE

Enumeration Type Documentation

◆ channels

◆ subbands

Function Documentation

◆ aptx_update_codeword_history()

◆ aptx_generate_dither()

◆ aptx_qmf_filter_signal_push()

◆ aptx_qmf_convolution()

◆ aptx_qmf_polyphase_analysis()

◆ aptx_qmf_tree_analysis()

◆ aptx_qmf_polyphase_synthesis()

◆ aptx_qmf_tree_synthesis()

◆ aptx_bin_search()

◆ aptx_quantize_difference()

◆ aptx_encode_channel()

◆ aptx_decode_channel()

◆ aptx_invert_quantization()

◆ aptx_reconstructed_differences_update()

◆ aptx_prediction_filtering()

◆ aptx_process_subband()

◆ aptx_invert_quantize_and_prediction()

◆ aptx_quantized_parity()

◆ aptx_check_parity()

◆ aptx_insert_sync()

◆ aptx_pack_codeword()

◆ aptxhd_pack_codeword()

◆ aptx_unpack_codeword()

◆ aptxhd_unpack_codeword()

◆ aptx_encode_samples()

◆ aptx_decode_samples()

◆ aptx_init()

◆ aptx_decode_frame()

◆ aptx_encode_frame()

◆ aptx_close()

Variable Documentation

◆ quantize_intervals_LF

◆ invert_quantize_dither_factors_LF

◆ quantize_dither_factors_LF

◆ quantize_factor_select_offset_LF

◆ quantize_intervals_MLF

◆ invert_quantize_dither_factors_MLF

◆ quantize_dither_factors_MLF

◆ quantize_factor_select_offset_MLF

◆ quantize_intervals_MHF

◆ invert_quantize_dither_factors_MHF

◆ quantize_dither_factors_MHF

◆ quantize_factor_select_offset_MHF

◆ quantize_intervals_HF

◆ invert_quantize_dither_factors_HF

◆ quantize_dither_factors_HF

◆ quantize_factor_select_offset_HF

◆ hd_quantize_intervals_LF

◆ hd_invert_quantize_dither_factors_LF

◆ hd_quantize_dither_factors_LF

◆ hd_quantize_factor_select_offset_LF

◆ hd_quantize_intervals_MLF

◆ hd_invert_quantize_dither_factors_MLF

◆ hd_quantize_dither_factors_MLF

◆ hd_quantize_factor_select_offset_MLF

◆ hd_quantize_intervals_MHF

◆ hd_invert_quantize_dither_factors_MHF

◆ hd_quantize_dither_factors_MHF

◆ hd_quantize_factor_select_offset_MHF

◆ hd_quantize_intervals_HF

◆ hd_invert_quantize_dither_factors_HF

◆ hd_quantize_dither_factors_HF

◆ hd_quantize_factor_select_offset_HF

◆ tables

◆ quantization_factors

◆ aptx_qmf_outer_coeffs

◆ aptx_qmf_inner_coeffs