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media/libopus/silk/code_signs.c@6474c204b198 (annotated)

media/libopus/silk/code_signs.c

Wed, 31 Dec 2014 06:09:35 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Wed, 31 Dec 2014 06:09:35 +0100

changeset 0

6474c204b198

permissions

-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0	1	/***********************************************************************
michael@0	2	Copyright (c) 2006-2011, Skype Limited. All rights reserved.
michael@0	3	Redistribution and use in source and binary forms, with or without
michael@0	4	modification, are permitted provided that the following conditions
michael@0	5	are met:
michael@0	6	- Redistributions of source code must retain the above copyright notice,
michael@0	7	this list of conditions and the following disclaimer.
michael@0	8	- Redistributions in binary form must reproduce the above copyright
michael@0	9	notice, this list of conditions and the following disclaimer in the
michael@0	10	documentation and/or other materials provided with the distribution.
michael@0	11	- Neither the name of Internet Society, IETF or IETF Trust, nor the
michael@0	12	names of specific contributors, may be used to endorse or promote
michael@0	13	products derived from this software without specific prior written
michael@0	14	permission.
michael@0	15	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
michael@0	16	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0	17	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0	18	ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
michael@0	19	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0	20	CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0	21	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0	22	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0	23	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0	24	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
michael@0	25	POSSIBILITY OF SUCH DAMAGE.
michael@0	26	***********************************************************************/
michael@0	27
michael@0	28	#ifdef HAVE_CONFIG_H
michael@0	29	#include "config.h"
michael@0	30	#endif
michael@0	31
michael@0	32	#include "main.h"
michael@0	33
michael@0	34	/*#define silk_enc_map(a) ((a) > 0 ? 1 : 0)*/
michael@0	35	/*#define silk_dec_map(a) ((a) > 0 ? 1 : -1)*/
michael@0	36	/* shifting avoids if-statement */
michael@0	37	#define silk_enc_map(a) ( silk_RSHIFT( (a), 15 ) + 1 )
michael@0	38	#define silk_dec_map(a) ( silk_LSHIFT( (a), 1 ) - 1 )
michael@0	39
michael@0	40	/* Encodes signs of excitation */
michael@0	41	void silk_encode_signs(
michael@0	42	ec_enc *psRangeEnc, /* I/O Compressor data structure */
michael@0	43	const opus_int8 pulses[], /* I pulse signal */
michael@0	44	opus_int length, /* I length of input */
michael@0	45	const opus_int signalType, /* I Signal type */
michael@0	46	const opus_int quantOffsetType, /* I Quantization offset type */
michael@0	47	const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */
michael@0	48	)
michael@0	49	{
michael@0	50	opus_int i, j, p;
michael@0	51	opus_uint8 icdf[ 2 ];
michael@0	52	const opus_int8 *q_ptr;
michael@0	53	const opus_uint8 *icdf_ptr;
michael@0	54
michael@0	55	icdf[ 1 ] = 0;
michael@0	56	q_ptr = pulses;
michael@0	57	i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) );
michael@0	58	icdf_ptr = &silk_sign_iCDF[ i ];
michael@0	59	length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH );
michael@0	60	for( i = 0; i < length; i++ ) {
michael@0	61	p = sum_pulses[ i ];
michael@0	62	if( p > 0 ) {
michael@0	63	icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ];
michael@0	64	for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) {
michael@0	65	if( q_ptr[ j ] != 0 ) {
michael@0	66	ec_enc_icdf( psRangeEnc, silk_enc_map( q_ptr[ j ]), icdf, 8 );
michael@0	67	}
michael@0	68	}
michael@0	69	}
michael@0	70	q_ptr += SHELL_CODEC_FRAME_LENGTH;
michael@0	71	}
michael@0	72	}
michael@0	73
michael@0	74	/* Decodes signs of excitation */
michael@0	75	void silk_decode_signs(
michael@0	76	ec_dec *psRangeDec, /* I/O Compressor data structure */
michael@0	77	opus_int pulses[], /* I/O pulse signal */
michael@0	78	opus_int length, /* I length of input */
michael@0	79	const opus_int signalType, /* I Signal type */
michael@0	80	const opus_int quantOffsetType, /* I Quantization offset type */
michael@0	81	const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */
michael@0	82	)
michael@0	83	{
michael@0	84	opus_int i, j, p;
michael@0	85	opus_uint8 icdf[ 2 ];
michael@0	86	opus_int *q_ptr;
michael@0	87	const opus_uint8 *icdf_ptr;
michael@0	88
michael@0	89	icdf[ 1 ] = 0;
michael@0	90	q_ptr = pulses;
michael@0	91	i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) );
michael@0	92	icdf_ptr = &silk_sign_iCDF[ i ];
michael@0	93	length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH );
michael@0	94	for( i = 0; i < length; i++ ) {
michael@0	95	p = sum_pulses[ i ];
michael@0	96	if( p > 0 ) {
michael@0	97	icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ];
michael@0	98	for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) {
michael@0	99	if( q_ptr[ j ] > 0 ) {
michael@0	100	/* attach sign */
michael@0	101	#if 0
michael@0	102	/* conditional implementation */
michael@0	103	if( ec_dec_icdf( psRangeDec, icdf, 8 ) == 0 ) {
michael@0	104	q_ptr[ j ] = -q_ptr[ j ];
michael@0	105	}
michael@0	106	#else
michael@0	107	/* implementation with shift, subtraction, multiplication */
michael@0	108	q_ptr[ j ] *= silk_dec_map( ec_dec_icdf( psRangeDec, icdf, 8 ) );
michael@0	109	#endif
michael@0	110	}
michael@0	111	}
michael@0	112	}
michael@0	113	q_ptr += SHELL_CODEC_FRAME_LENGTH;
michael@0	114	}
michael@0	115	}