#include <math.h>
#include <stdint.h>
#include "libavutil/channel_layout.h"
#include "libavutil/float_dsp.h"
#include "avcodec.h"
#include "fft.h"
#include "internal.h"
#include "lsp.h"
#include "sinewin.h"
#include "twinvq.h"

Functions
static float	eval_lpc_spectrum (const float *lsp, float cos_val, int order)
	Evaluate a single LPC amplitude spectrum envelope coefficient from the line spectrum pairs. More...

static void	eval_lpcenv (TwinVQContext tctx, const float cos_vals, float *lpc)
	Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs. More...

static void	interpolate (float *out, float v1, float v2, int size)

static float	get_cos (int idx, int part, const float *cos_tab, int size)

static void	eval_lpcenv_or_interp (TwinVQContext tctx, enum TwinVQFrameType ftype, float out, const float *in, int size, int step, int part)
	Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs. More...

static void	eval_lpcenv_2parts (TwinVQContext tctx, enum TwinVQFrameType ftype, const float buf, float *lpc, int size, int step)

static void	dequant (TwinVQContext tctx, const uint8_t cb_bits, float out, enum TwinVQFrameType ftype, const int16_t cb0, const int16_t *cb1, int cb_len)
	Inverse quantization. More...

static void	dec_gain (TwinVQContext tctx, enum TwinVQFrameType ftype, float out)

static void	rearrange_lsp (int order, float *lsp, float min_dist)
	Rearrange the LSP coefficients so that they have a minimum distance of min_dist. More...

static void	decode_lsp (TwinVQContext tctx, int lpc_idx1, uint8_t lpc_idx2, int lpc_hist_idx, float lsp, float hist)

static void	dec_lpc_spectrum_inv (TwinVQContext tctx, float lsp, enum TwinVQFrameType ftype, float *lpc)

static void	imdct_and_window (TwinVQContext tctx, enum TwinVQFrameType ftype, int wtype, float in, float *prev, int ch)

static void	imdct_output (TwinVQContext tctx, enum TwinVQFrameType ftype, int wtype, float *out, int offset)

static void	read_and_decode_spectrum (TwinVQContext tctx, float out, enum TwinVQFrameType ftype)

int	ff_twinvq_decode_frame (AVCodecContext avctx, void data, int got_frame_ptr, AVPacket avpkt)

static av_cold int	init_mdct_win (TwinVQContext *tctx)
	Init IMDCT and windowing tables. More...

static void	permutate_in_line (int16_t *tab, int num_vect, int num_blocks, int block_size, const uint8_t line_len[2], int length_div, enum TwinVQFrameType ftype)
	Interpret the data as if it were a num_blocks x line_len[0] matrix and for each line do a cyclic permutation, i.e. More...

static void	transpose_perm (int16_t out, int16_t in, int num_vect, const uint8_t line_len[2], int length_div)
	Interpret the input data as in the following table: More...

static void	linear_perm (int16_t out, int16_t in, int n_blocks, int size)

static av_cold void	construct_perm_table (TwinVQContext *tctx, enum TwinVQFrameType ftype)

static av_cold void	init_bitstream_params (TwinVQContext *tctx)

av_cold int	ff_twinvq_decode_close (AVCodecContext *avctx)

av_cold int	ff_twinvq_decode_init (AVCodecContext *avctx)

Variables
static const uint8_t	wtype_to_wsize [] = { 0, 0, 2, 2, 2, 1, 0, 1, 1 }

enum TwinVQFrameType	ff_twinvq_wtype_to_ftype_table []

Function Documentation

◆ eval_lpc_spectrum()

static float eval_lpc_spectrum	(	const float *	lsp,
		float	cos_val,
		int	order
	)

static

Evaluate a single LPC amplitude spectrum envelope coefficient from the line spectrum pairs.

Parameters

lsp	a vector of the cosine of the LSP values
cos_val	cos(PI*i/N) where i is the index of the LPC amplitude
order	the order of the LSP (and the size of the *lsp buffer). Must be a multiple of four.

Returns: the LPC value

Todo:: reuse code from Vorbis decoder: vorbis_floor0_decode

Definition at line 46 of file twinvq.c.

Referenced by eval_lpcenv(), and eval_lpcenv_or_interp().

◆ eval_lpcenv()

static void eval_lpcenv	(	TwinVQContext *	tctx,
		const float *	cos_vals,
		float *	lpc
	)

static

Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs.

Definition at line 71 of file twinvq.c.

Referenced by dec_lpc_spectrum_inv().

◆ interpolate()

static void interpolate	(	float *	out,
		float	v1,
		float	v2,
		int	size
	)

static

Definition at line 84 of file twinvq.c.

Referenced by avfilter_transform(), bayer_to_rgb24_wrapper(), bayer_to_rgb48_wrapper(), bayer_to_yv12_wrapper(), blend_frames(), deshake_transform_c(), eval_lpcenv_2parts(), eval_lpcenv_or_interp(), and process_work_frame().

◆ get_cos()

static float get_cos	(	int	idx,
		int	part,
		const float *	cos_tab,
		int	size
	)

inlinestatic

Definition at line 95 of file twinvq.c.

Referenced by eval_lpcenv_or_interp().

◆ eval_lpcenv_or_interp()

static void eval_lpcenv_or_interp	(	TwinVQContext *	tctx,
		enum TwinVQFrameType	ftype,
		float *	out,
		const float *	in,
		int	size,
		int	step,
		int	part
	)

inlinestatic

Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs.

Probably for speed reasons, the coefficients are evaluated as siiiibiiiisiiiibiiiisiiiibiiiisiiiibiiiis ... where s is an evaluated value, i is a value interpolated from the others and b might be either calculated or interpolated, depending on an unexplained condition.

Parameters

step	the size of a block "siiiibiiii"
in	the cosine of the LSP data
part	is 0 for 0...PI (positive cosine values) and 1 for PI...2PI (negative cosine values)
size	the size of the whole output

Definition at line 115 of file twinvq.c.

Referenced by eval_lpcenv_2parts().

◆ eval_lpcenv_2parts()

static void eval_lpcenv_2parts	(	TwinVQContext *	tctx,
		enum TwinVQFrameType	ftype,
		const float *	buf,
		float *	lpc,
		int	size,
		int	step
	)

static

Definition at line 152 of file twinvq.c.

Referenced by dec_lpc_spectrum_inv().

◆ dequant()

static void dequant	(	TwinVQContext *	tctx,
		const uint8_t *	cb_bits,
		float *	out,
		enum TwinVQFrameType	ftype,
		const int16_t *	cb0,
		const int16_t *	cb1,
		int	cb_len
	)

static

Inverse quantization.

Read CB coefficients for cb1 and cb2 from the bitstream, sum the corresponding vectors and write the result to *out after permutation.

Definition at line 172 of file twinvq.c.

Referenced by read_and_decode_spectrum().

◆ dec_gain()

static void dec_gain	(	TwinVQContext *	tctx,
		enum TwinVQFrameType	ftype,
		float *	out
	)

static

Definition at line 214 of file twinvq.c.

Referenced by read_and_decode_spectrum().

◆ rearrange_lsp()

static void rearrange_lsp	(	int	order,
		float *	lsp,
		float	min_dist
	)

static

Rearrange the LSP coefficients so that they have a minimum distance of min_dist.

This function does it exactly as described in section of 3.2.4 of the G.729 specification (but interestingly is different from what the reference decoder actually does).

Definition at line 250 of file twinvq.c.

Referenced by decode_lsp().

◆ decode_lsp()

static void decode_lsp	(	TwinVQContext *	tctx,
		int	lpc_idx1,
		uint8_t *	lpc_idx2,
		int	lpc_hist_idx,
		float *	lsp,
		float *	hist
	)

static

Definition at line 263 of file twinvq.c.

Referenced by read_and_decode_spectrum().

◆ dec_lpc_spectrum_inv()

static void dec_lpc_spectrum_inv	(	TwinVQContext *	tctx,
		float *	lsp,
		enum TwinVQFrameType	ftype,
		float *	lpc
	)

static

Definition at line 303 of file twinvq.c.

Referenced by read_and_decode_spectrum().

◆ imdct_and_window()

static void imdct_and_window	(	TwinVQContext *	tctx,
		enum TwinVQFrameType	ftype,
		int	wtype,
		float *	in,
		float *	prev,
		int	ch
	)

static

Definition at line 327 of file twinvq.c.

Referenced by imdct_output(), and spectral_to_sample().

◆ imdct_output()

static void imdct_output	(	TwinVQContext *	tctx,
		enum TwinVQFrameType	ftype,
		int	wtype,
		float **	out,
		int	offset
	)

static

Definition at line 378 of file twinvq.c.

Referenced by ff_twinvq_decode_frame().

◆ read_and_decode_spectrum()

static void read_and_decode_spectrum	(	TwinVQContext *	tctx,
		float *	out,
		enum TwinVQFrameType	ftype
	)

static

Definition at line 412 of file twinvq.c.

Referenced by ff_twinvq_decode_frame().

◆ ff_twinvq_decode_frame()

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

Definition at line 476 of file twinvq.c.

◆ init_mdct_win()

static av_cold int init_mdct_win ( TwinVQContext * tctx )

static

Init IMDCT and windowing tables.

Definition at line 533 of file twinvq.c.

Referenced by ff_twinvq_decode_init().

◆ permutate_in_line()

static void permutate_in_line	(	int16_t *	tab,
		int	num_vect,
		int	num_blocks,
		int	block_size,
		const uint8_t	line_len[2],
		int	length_div,
		enum TwinVQFrameType	ftype
	)

static

Interpret the data as if it were a num_blocks x line_len[0] matrix and for each line do a cyclic permutation, i.e.

abcdefghijklm -> defghijklmabc where the amount to be shifted is evaluated depending on the column.

Definition at line 580 of file twinvq.c.

Referenced by construct_perm_table().

◆ transpose_perm()

static void transpose_perm	(	int16_t *	out,
		int16_t *	in,
		int	num_vect,
		const uint8_t	line_len[2],
		int	length_div
	)

static

Interpret the input data as in the following table:

*
* abcdefgh
* ijklmnop
* qrstuvw
* x123456
*
*

and transpose it, giving the output aiqxbjr1cks2dlt3emu4fvn5gow6hp

Definition at line 620 of file twinvq.c.

Referenced by construct_perm_table(), and load_native_model().

◆ linear_perm()

static void linear_perm	(	int16_t *	out,
		int16_t *	in,
		int	n_blocks,
		int	size
	)

static

Definition at line 631 of file twinvq.c.

Referenced by construct_perm_table().

◆ construct_perm_table()

static av_cold void construct_perm_table	(	TwinVQContext *	tctx,
		enum TwinVQFrameType	ftype
	)

static

Definition at line 640 of file twinvq.c.

Referenced by init_bitstream_params().

◆ init_bitstream_params()

static av_cold void init_bitstream_params ( TwinVQContext * tctx )

static

Definition at line 666 of file twinvq.c.

Referenced by ff_twinvq_decode_init().

◆ ff_twinvq_decode_close()

av_cold int ff_twinvq_decode_close ( AVCodecContext * avctx )

Definition at line 741 of file twinvq.c.

Referenced by ff_twinvq_decode_init().

◆ ff_twinvq_decode_init()

av_cold int ff_twinvq_decode_init ( AVCodecContext * avctx )

Definition at line 760 of file twinvq.c.

Referenced by metasound_decode_init(), and twinvq_decode_init().

Variable Documentation

◆ wtype_to_wsize

const uint8_t wtype_to_wsize[] = { 0, 0, 2, 2, 2, 1, 0, 1, 1 }

static

Definition at line 325 of file twinvq.c.

Referenced by imdct_and_window().

◆ ff_twinvq_wtype_to_ftype_table

enum TwinVQFrameType ff_twinvq_wtype_to_ftype_table[]

Initial value:

= {
    TWINVQ_FT_LONG,   TWINVQ_FT_LONG, TWINVQ_FT_SHORT, TWINVQ_FT_LONG,
    TWINVQ_FT_MEDIUM, TWINVQ_FT_LONG, TWINVQ_FT_LONG,  TWINVQ_FT_MEDIUM,
    TWINVQ_FT_MEDIUM
}

Definition at line 470 of file twinvq.c.

Referenced by metasound_read_bitstream(), and twinvq_read_bitstream().

Functions

Variables

Function Documentation

◆ eval_lpc_spectrum()

◆ eval_lpcenv()

◆ interpolate()

◆ get_cos()

◆ eval_lpcenv_or_interp()

◆ eval_lpcenv_2parts()

◆ dequant()

◆ dec_gain()

◆ rearrange_lsp()

◆ decode_lsp()

◆ dec_lpc_spectrum_inv()

◆ imdct_and_window()

◆ imdct_output()

◆ read_and_decode_spectrum()

◆ ff_twinvq_decode_frame()

◆ init_mdct_win()

◆ permutate_in_line()

◆ transpose_perm()

◆ linear_perm()

◆ construct_perm_table()

◆ init_bitstream_params()

◆ ff_twinvq_decode_close()

◆ ff_twinvq_decode_init()

Variable Documentation

◆ wtype_to_wsize

◆ ff_twinvq_wtype_to_ftype_table