#include "aacdec.h"
#include "aacdectab.h"
#include "avcodec.h"
#include "libavutil/qsort.h"

Functions
static av_cold void	aacsbr_tableinit (void)

av_cold void AAC_RENAME()	ff_aac_sbr_init (void)
	Initialize SBR. More...

static void	sbr_turnoff (SpectralBandReplication *sbr)
	Places SBR in pure upsampling mode. More...

av_cold int AAC_RENAME()	ff_aac_sbr_ctx_init (AACDecContext ac, SpectralBandReplication sbr, int id_aac)
	Initialize one SBR context. More...

av_cold void AAC_RENAME()	ff_aac_sbr_ctx_close (SpectralBandReplication *sbr)
	Close one SBR context. More...

static int	qsort_comparison_function_int16 (const void a, const void b)

static int	in_table_int16 (const int16_t *table, int last_el, int16_t needle)

static void	sbr_make_f_tablelim (SpectralBandReplication *sbr)
	Limiter Frequency Band Table (14496-3 sp04 p198) More...

static unsigned int	read_sbr_header (SpectralBandReplication sbr, GetBitContext gb)

static int	array_min_int16 (const int16_t *array, int nel)

static int	check_n_master (AVCodecContext *avctx, int n_master, int bs_xover_band)

static int	sbr_make_f_master (AACDecContext ac, SpectralBandReplication sbr, SpectrumParameters *spectrum)
	Master Frequency Band Table (14496-3 sp04 p194) More...

static int	sbr_hf_calc_npatches (AACDecContext ac, SpectralBandReplication sbr)
	High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46) More...

static int	sbr_make_f_derived (AACDecContext ac, SpectralBandReplication sbr)
	Derived Frequency Band Tables (14496-3 sp04 p197) More...

static av_always_inline void	get_bits1_vector (GetBitContext gb, uint8_t vec, int elements)

static int	read_sbr_grid (AACDecContext ac, SpectralBandReplication sbr, GetBitContext gb, SBRData ch_data)

static void	copy_sbr_grid (SBRData dst, const SBRData src)

static void	read_sbr_dtdf (SpectralBandReplication sbr, GetBitContext gb, SBRData *ch_data)
	Read how the envelope and noise floor data is delta coded. More...

static void	read_sbr_invf (SpectralBandReplication sbr, GetBitContext gb, SBRData *ch_data)
	Read inverse filtering data. More...

static int	read_sbr_envelope (AACDecContext ac, SpectralBandReplication sbr, GetBitContext gb, SBRData ch_data, int ch)

static int	read_sbr_noise (AACDecContext ac, SpectralBandReplication sbr, GetBitContext gb, SBRData ch_data, int ch)

static void	read_sbr_extension (AACDecContext ac, SpectralBandReplication sbr, GetBitContext gb, int bs_extension_id, int num_bits_left)

static int	read_sbr_single_channel_element (AACDecContext ac, SpectralBandReplication sbr, GetBitContext *gb)

static int	read_sbr_channel_pair_element (AACDecContext ac, SpectralBandReplication sbr, GetBitContext *gb)

static unsigned int	read_sbr_data (AACDecContext ac, SpectralBandReplication sbr, GetBitContext *gb, int id_aac)

static void	sbr_reset (AACDecContext ac, SpectralBandReplication sbr)

int AAC_RENAME()	ff_decode_sbr_extension (AACDecContext ac, SpectralBandReplication sbr, GetBitContext *gb_host, int crc, int cnt, int id_aac)
	Decode Spectral Band Replication extension data; reference: table 4.55. More...

static void	sbr_qmf_analysis (AVFloatDSPContext dsp, AVTXContext mdct, av_tx_fn mdct_fn, SBRDSPContext sbrdsp, const INTFLOAT in, INTFLOAT *x, INTFLOAT z[320], INTFLOAT W[2][32][32][2], int buf_idx)
	Analysis QMF Bank (14496-3 sp04 p206) More...

static void	sbr_qmf_synthesis (AVTXContext mdct, av_tx_fn mdct_fn, SBRDSPContext sbrdsp, AVFloatDSPContext dsp, INTFLOAT out, INTFLOAT X[2][38][64], INTFLOAT mdct_buf[2][64], INTFLOAT v0, int v_off, const unsigned int div)
	Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank (14496-3 sp04 p206) More...

static int	sbr_lf_gen (SpectralBandReplication *sbr, INTFLOAT X_low[32][40][2], const INTFLOAT W[2][32][32][2], int buf_idx)
	Generate the subband filtered lowband. More...

static int	sbr_hf_gen (AACDecContext ac, SpectralBandReplication sbr, INTFLOAT X_high[64][40][2], const INTFLOAT X_low[32][40][2], const INTFLOAT(alpha0)[2], const INTFLOAT(alpha1)[2], const INTFLOAT bw_array[5], const uint8_t *t_env, int bs_num_env)
	High Frequency Generator (14496-3 sp04 p215) More...

static int	sbr_x_gen (SpectralBandReplication *sbr, INTFLOAT X[2][38][64], const INTFLOAT Y0[38][64][2], const INTFLOAT Y1[38][64][2], const INTFLOAT X_low[32][40][2], int ch)
	Generate the subband filtered lowband. More...

static int	sbr_mapping (AACDecContext ac, SpectralBandReplication sbr, SBRData *ch_data, int e_a[2])
	High Frequency Adjustment (14496-3 sp04 p217) and Mapping (14496-3 sp04 p217) More...

static void	sbr_env_estimate (AAC_FLOAT(e_curr)[48], INTFLOAT X_high[64][40][2], SpectralBandReplication sbr, SBRData *ch_data)
	Estimation of current envelope (14496-3 sp04 p218) More...

void AAC_RENAME()	ff_sbr_apply (AACDecContext ac, SpectralBandReplication sbr, int id_aac, INTFLOAT L, INTFLOAT R)
	Apply one SBR element to one AAC element. More...

static void	aacsbr_func_ptr_init (AACSBRContext *c)

Variables
static const int8_t	ceil_log2 []
	ceil(log2(index+1)) More...

Detailed Description

AAC Spectral Band Replication decoding functions

Author: Robert Swain ( rob opendot cl ); Stanislav Ocovaj ( stani.nosp@m.slav.nosp@m..ocov.nosp@m.aj@i.nosp@m.mgtec.nosp@m..com ); Zoran Basaric ( zoran.nosp@m..bas.nosp@m.aric@.nosp@m.imgt.nosp@m.ec.co.nosp@m.m )

Definition in file aacsbr_template.c.

Function Documentation

◆ aacsbr_tableinit()

static av_cold void aacsbr_tableinit ( void )

static

Definition at line 40 of file aacsbr_template.c.

Referenced by ff_aac_sbr_init().

◆ ff_aac_sbr_init()

av_cold void AAC_RENAME() ff_aac_sbr_init ( void )

Initialize SBR.

Definition at line 48 of file aacsbr_template.c.

Referenced by aac_static_table_init().

◆ sbr_turnoff()

static void sbr_turnoff ( SpectralBandReplication * sbr )

static

Places SBR in pure upsampling mode.

Definition at line 56 of file aacsbr_template.c.

Referenced by ff_aac_sbr_ctx_init(), ff_decode_sbr_extension(), ff_sbr_apply(), read_sbr_data(), sbr_mapping(), and sbr_reset().

◆ ff_aac_sbr_ctx_init()

av_cold int AAC_RENAME() ff_aac_sbr_ctx_init	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr,
		int	id_aac
	)

Initialize one SBR context.

Definition at line 67 of file aacsbr_template.c.

Referenced by che_configure().

◆ ff_aac_sbr_ctx_close()

av_cold void AAC_RENAME() ff_aac_sbr_ctx_close ( SpectralBandReplication * sbr )

Close one SBR context.

Definition at line 105 of file aacsbr_template.c.

Referenced by aac_decode_close(), and che_configure().

◆ qsort_comparison_function_int16()

static int qsort_comparison_function_int16	(	const void *	a,
		const void *	b
	)

static

Definition at line 111 of file aacsbr_template.c.

Referenced by sbr_make_f_master(), and sbr_make_f_tablelim().

◆ in_table_int16()

static int in_table_int16	(	const int16_t *	table,
		int	last_el,
		int16_t	needle
	)

inlinestatic

Definition at line 116 of file aacsbr_template.c.

Referenced by sbr_make_f_tablelim().

◆ sbr_make_f_tablelim()

static void sbr_make_f_tablelim ( SpectralBandReplication * sbr )

static

Limiter Frequency Band Table (14496-3 sp04 p198)

Definition at line 126 of file aacsbr_template.c.

Referenced by read_sbr_header(), and sbr_make_f_derived().

◆ read_sbr_header()

static unsigned int read_sbr_header	(	SpectralBandReplication *	sbr,
		GetBitContext *	gb
	)

static

Definition at line 177 of file aacsbr_template.c.

Referenced by ff_decode_sbr_extension().

◆ array_min_int16()

static int array_min_int16	(	const int16_t *	array,
		int	nel
	)

static

Definition at line 232 of file aacsbr_template.c.

Referenced by sbr_make_f_master().

◆ check_n_master()

static int check_n_master	(	AVCodecContext *	avctx,
		int	n_master,
		int	bs_xover_band
	)

static

Definition at line 240 of file aacsbr_template.c.

Referenced by sbr_make_f_master().

◆ sbr_make_f_master()

static int sbr_make_f_master	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr,
		SpectrumParameters *	spectrum
	)

static

Master Frequency Band Table (14496-3 sp04 p194)

Definition at line 257 of file aacsbr_template.c.

Referenced by sbr_reset().

◆ sbr_hf_calc_npatches()

static int sbr_hf_calc_npatches	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr
	)

static

High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)

Definition at line 477 of file aacsbr_template.c.

Referenced by sbr_make_f_derived().

◆ sbr_make_f_derived()

static int sbr_make_f_derived	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr
	)

static

Derived Frequency Band Tables (14496-3 sp04 p197)

Definition at line 535 of file aacsbr_template.c.

Referenced by sbr_reset().

◆ get_bits1_vector()

static av_always_inline void get_bits1_vector	(	GetBitContext *	gb,
		uint8_t *	vec,
		int	elements
	)

static

Definition at line 606 of file aacsbr_template.c.

Referenced by read_sbr_channel_pair_element(), read_sbr_dtdf(), read_sbr_grid(), and read_sbr_single_channel_element().

◆ read_sbr_grid()

static int read_sbr_grid	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr,
		GetBitContext *	gb,
		SBRData *	ch_data
	)

static

Definition at line 620 of file aacsbr_template.c.

Referenced by read_sbr_channel_pair_element(), and read_sbr_single_channel_element().

◆ copy_sbr_grid()

static void copy_sbr_grid	(	SBRData *	dst,
		const SBRData *	src
	)

static

Definition at line 767 of file aacsbr_template.c.

Referenced by read_sbr_channel_pair_element().

◆ read_sbr_dtdf()

static void read_sbr_dtdf	(	SpectralBandReplication *	sbr,
		GetBitContext *	gb,
		SBRData *	ch_data
	)

static

Read how the envelope and noise floor data is delta coded.

Definition at line 785 of file aacsbr_template.c.

Referenced by read_sbr_channel_pair_element(), and read_sbr_single_channel_element().

◆ read_sbr_invf()

static void read_sbr_invf	(	SpectralBandReplication *	sbr,
		GetBitContext *	gb,
		SBRData *	ch_data
	)

static

Read inverse filtering data.

Definition at line 793 of file aacsbr_template.c.

Referenced by read_sbr_channel_pair_element(), and read_sbr_single_channel_element().

◆ read_sbr_envelope()

static int read_sbr_envelope	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr,
		GetBitContext *	gb,
		SBRData *	ch_data,
		int	ch
	)

static

Definition at line 803 of file aacsbr_template.c.

Referenced by read_sbr_channel_pair_element(), and read_sbr_single_channel_element().

◆ read_sbr_noise()

static int read_sbr_noise	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr,
		GetBitContext *	gb,
		SBRData *	ch_data,
		int	ch
	)

static

Definition at line 883 of file aacsbr_template.c.

Referenced by read_sbr_channel_pair_element(), and read_sbr_single_channel_element().

◆ read_sbr_extension()

static void read_sbr_extension	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr,
		GetBitContext *	gb,
		int	bs_extension_id,
		int *	num_bits_left
	)

static

Definition at line 925 of file aacsbr_template.c.

Referenced by read_sbr_data().

◆ read_sbr_single_channel_element()

static int read_sbr_single_channel_element	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr,
		GetBitContext *	gb
	)

static

Definition at line 952 of file aacsbr_template.c.

Referenced by read_sbr_data().

◆ read_sbr_channel_pair_element()

static int read_sbr_channel_pair_element	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr,
		GetBitContext *	gb
	)

static

Definition at line 976 of file aacsbr_template.c.

Referenced by read_sbr_data().

◆ read_sbr_data()

static unsigned int read_sbr_data	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr,
		GetBitContext *	gb,
		int	id_aac
	)

static

Definition at line 1028 of file aacsbr_template.c.

Referenced by ff_decode_sbr_extension().

◆ sbr_reset()

static void sbr_reset	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr
	)

static

Definition at line 1072 of file aacsbr_template.c.

Referenced by ff_decode_sbr_extension().

◆ ff_decode_sbr_extension()

int AAC_RENAME() ff_decode_sbr_extension	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr,
		GetBitContext *	gb_host,
		int	crc,
		int	cnt,
		int	id_aac
	)

Decode Spectral Band Replication extension data; reference: table 4.55.

Decode one SBR element.

Parameters

crc	flag indicating the presence of CRC checksum
cnt	length of TYPE_FIL syntactic element in bytes

Returns: Returns number of bytes consumed from the TYPE_FIL element.

Definition at line 1093 of file aacsbr_template.c.

Referenced by decode_extension_payload().

◆ sbr_qmf_analysis()

static void sbr_qmf_analysis	(	AVFloatDSPContext *	dsp,
		AVTXContext *	mdct,
		av_tx_fn	mdct_fn,
		SBRDSPContext *	sbrdsp,
		const INTFLOAT *	in,
		INTFLOAT *	x,
		INTFLOAT	z[320],
		INTFLOAT	W[2][32][32][2],
		int	buf_idx
	)

static

Analysis QMF Bank (14496-3 sp04 p206)

Parameters

x	pointer to the beginning of the first sample window
W	array of complex-valued samples split into subbands

Definition at line 1150 of file aacsbr_template.c.

Referenced by ff_sbr_apply().

◆ sbr_qmf_synthesis()

static void sbr_qmf_synthesis	(	AVTXContext *	mdct,
		av_tx_fn	mdct_fn,
		SBRDSPContext *	sbrdsp,
		AVFloatDSPContext *	dsp,
		INTFLOAT *	out,
		INTFLOAT	X[2][38][64],
		INTFLOAT	mdct_buf[2][64],
		INTFLOAT *	v0,
		int *	v_off,
		const unsigned int	div
	)

static

Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank (14496-3 sp04 p206)

Definition at line 1194 of file aacsbr_template.c.

Referenced by ff_sbr_apply().

◆ sbr_lf_gen()

static int sbr_lf_gen	(	SpectralBandReplication *	sbr,
		INTFLOAT	X_low[32][40][2],
		const INTFLOAT	W[2][32][32][2],
		int	buf_idx
	)

static

Generate the subband filtered lowband.

Definition at line 1246 of file aacsbr_template.c.

Referenced by aacsbr_func_ptr_init().

◆ sbr_hf_gen()

static int sbr_hf_gen	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr,
		INTFLOAT	X_high[64][40][2],
		const INTFLOAT	X_low[32][40][2],
		const INTFLOAT(*)	alpha0[2],
		const INTFLOAT(*)	alpha1[2],
		const INTFLOAT	bw_array[5],
		const uint8_t *	t_env,
		int	bs_num_env
	)

static

High Frequency Generator (14496-3 sp04 p215)

Definition at line 1271 of file aacsbr_template.c.

Referenced by ff_sbr_apply().

◆ sbr_x_gen()

static int sbr_x_gen	(	SpectralBandReplication *	sbr,
		INTFLOAT	X[2][38][64],
		const INTFLOAT	Y0[38][64][2],
		const INTFLOAT	Y1[38][64][2],
		const INTFLOAT	X_low[32][40][2],
		int	ch
	)

static

Generate the subband filtered lowband.

Definition at line 1306 of file aacsbr_template.c.

Referenced by aacsbr_func_ptr_init().

◆ sbr_mapping()

static int sbr_mapping	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr,
		SBRData *	ch_data,
		int	e_a[2]
	)

static

High Frequency Adjustment (14496-3 sp04 p217) and Mapping (14496-3 sp04 p217)

Definition at line 1345 of file aacsbr_template.c.

Referenced by ff_sbr_apply().

◆ sbr_env_estimate()

static void sbr_env_estimate	(	AAC_FLOAT(*)	e_curr[48],
		INTFLOAT	X_high[64][40][2],
		SpectralBandReplication *	sbr,
		SBRData *	ch_data
	)

static

Estimation of current envelope (14496-3 sp04 p218)

Definition at line 1400 of file aacsbr_template.c.

Referenced by ff_sbr_apply().

◆ ff_sbr_apply()

void AAC_RENAME() ff_sbr_apply	(	AACDecContext *	ac,
		SpectralBandReplication *	sbr,
		int	id_aac,
		INTFLOAT *	L,
		INTFLOAT *	R
	)

Apply one SBR element to one AAC element.

Definition at line 1459 of file aacsbr_template.c.

Referenced by spectral_to_sample().

◆ aacsbr_func_ptr_init()

static void aacsbr_func_ptr_init ( AACSBRContext * c )

static

Definition at line 1553 of file aacsbr_template.c.

Referenced by ff_aac_sbr_ctx_init().

Variable Documentation

◆ ceil_log2

const int8_t ceil_log2[]

static

Initial value:

= {
    0, 1, 2, 2, 3, 3,
}

ceil(log2(index+1))

Definition at line 616 of file aacsbr_template.c.

Referenced by read_sbr_grid().

Functions

Variables

Detailed Description

Function Documentation

◆ aacsbr_tableinit()

◆ ff_aac_sbr_init()

◆ sbr_turnoff()

◆ ff_aac_sbr_ctx_init()

◆ ff_aac_sbr_ctx_close()

◆ qsort_comparison_function_int16()

◆ in_table_int16()

◆ sbr_make_f_tablelim()

◆ read_sbr_header()

◆ array_min_int16()

◆ check_n_master()

◆ sbr_make_f_master()

◆ sbr_hf_calc_npatches()

◆ sbr_make_f_derived()

◆ get_bits1_vector()

◆ read_sbr_grid()

◆ copy_sbr_grid()

◆ read_sbr_dtdf()

◆ read_sbr_invf()

◆ read_sbr_envelope()

◆ read_sbr_noise()

◆ read_sbr_extension()

◆ read_sbr_single_channel_element()

◆ read_sbr_channel_pair_element()

◆ read_sbr_data()

◆ sbr_reset()

◆ ff_decode_sbr_extension()

◆ sbr_qmf_analysis()

◆ sbr_qmf_synthesis()

◆ sbr_lf_gen()

◆ sbr_hf_gen()

◆ sbr_x_gen()

◆ sbr_mapping()

◆ sbr_env_estimate()

◆ ff_sbr_apply()

◆ aacsbr_func_ptr_init()

Variable Documentation

◆ ceil_log2