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Diffstat (limited to 'media/libstagefright/codecs/amrnb/enc/src/enc_lag6.cpp')
-rw-r--r-- | media/libstagefright/codecs/amrnb/enc/src/enc_lag6.cpp | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/media/libstagefright/codecs/amrnb/enc/src/enc_lag6.cpp b/media/libstagefright/codecs/amrnb/enc/src/enc_lag6.cpp deleted file mode 100644 index 2c7863e..0000000 --- a/media/libstagefright/codecs/amrnb/enc/src/enc_lag6.cpp +++ /dev/null @@ -1,230 +0,0 @@ -/* ------------------------------------------------------------------ - * Copyright (C) 1998-2009 PacketVideo - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either - * express or implied. - * See the License for the specific language governing permissions - * and limitations under the License. - * ------------------------------------------------------------------- - */ -/**************************************************************************************** -Portions of this file are derived from the following 3GPP standard: - - 3GPP TS 26.073 - ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec - Available from http://www.3gpp.org - -(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) -Permission to distribute, modify and use this file under the standard license -terms listed above has been obtained from the copyright holder. -****************************************************************************************/ -/* ------------------------------------------------------------------------------- - - - - Pathname: ./audio/gsm-amr/c/src/enc_lag6.c - Functions: - - Date: 02/05/2002 - ------------------------------------------------------------------------------- - REVISION HISTORY - - Description: Updated template used to PV coding template. - Changed to accept the pOverflow flag for EPOC compatibility. - - Description: - (1) Removed optimization -- mult(i, 6, pOverflow) is NOT the same as adding - i to itself 6 times. The reason is because the mult function does a - right shift by 15, which will obliterate smaller numbers. - - Description: Replaced "int" and/or "char" with OSCL defined types. - - Description: - ------------------------------------------------------------------------------- - MODULE DESCRIPTION - - ------------------------------------------------------------------------------- -*/ - -/*---------------------------------------------------------------------------- -; INCLUDES -----------------------------------------------------------------------------*/ -#include "enc_lag6.h" -#include "typedef.h" -#include "basic_op.h" - -/*---------------------------------------------------------------------------- -; MACROS -; Define module specific macros here -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; DEFINES -; Include all pre-processor statements here. Include conditional -; compile variables also. -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; LOCAL FUNCTION DEFINITIONS -; Function Prototype declaration -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; LOCAL VARIABLE DEFINITIONS -; Variable declaration - defined here and used outside this module -----------------------------------------------------------------------------*/ - - -/* ------------------------------------------------------------------------------- - FUNCTION NAME: Enc_lag6 ------------------------------------------------------------------------------- - INPUT AND OUTPUT DEFINITIONS - - Inputs: - T0 -- Word16 -- Pitch delay - T0_frac -- Word16 -- Fractional pitch delay - T0_min -- Word16 -- minimum of search range - delta_flag -- Word16 -- Flag for 1st (or 3rd) subframe - - Outputs: - pOverflow -- Pointer to Flag -- overflow indicator - - Returns: - Word16 -- Return index of encoding - - Global Variables Used: - None - - Local Variables Needed: - None - ------------------------------------------------------------------------------- - FUNCTION DESCRIPTION - - PURPOSE: Encoding of fractional pitch lag with 1/6 resolution. - - DESCRIPTION: - First and third subframes: - -------------------------- - The pitch range is divided as follows: - 17 3/6 to 94 3/6 resolution 1/6 - 95 to 143 resolution 1 - - The period is encoded with 9 bits. - For the range with fractions: - index = (T-17)*6 + frac - 3; - where T=[17..94] and frac=[-2,-1,0,1,2,3] - and for the integer only range - index = (T - 95) + 463; where T=[95..143] - - Second and fourth subframes: - ---------------------------- - For the 2nd and 4th subframes a resolution of 1/6 is always used, - and the search range is relative to the lag in previous subframe. - If t0 is the lag in the previous subframe then - t_min=t0-5 and t_max=t0+4 and the range is given by - (t_min-1) 3/6 to (t_max) 3/6 - - The period in the 2nd (and 4th) subframe is encoded with 6 bits: - index = (T-(t_min-1))*6 + frac - 3; - where T=[t_min-1..t_max] and frac=[-2,-1,0,1,2,3] - - Note that only 61 values are used. If the decoder receives 61, 62, - or 63 as the relative pitch index, it means that a transmission - error occurred and the pitch from previous subframe should be used. - ------------------------------------------------------------------------------- - REQUIREMENTS - - None - ------------------------------------------------------------------------------- - REFERENCES - - enc_lag6.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 - ------------------------------------------------------------------------------- - PSEUDO-CODE - - ------------------------------------------------------------------------------- - RESOURCES USED [optional] - - When the code is written for a specific target processor the - the resources used should be documented below. - - HEAP MEMORY USED: x bytes - - STACK MEMORY USED: x bytes - - CLOCK CYCLES: (cycle count equation for this function) + (variable - used to represent cycle count for each subroutine - called) - where: (cycle count variable) = cycle count for [subroutine - name] - ------------------------------------------------------------------------------- - CAUTION [optional] - [State any special notes, constraints or cautions for users of this function] - ------------------------------------------------------------------------------- -*/ - -Word16 Enc_lag6( /* o : Return index of encoding */ - Word16 T0, /* i : Pitch delay */ - Word16 T0_frac, /* i : Fractional pitch delay */ - Word16 T0_min, /* i : minimum of search range */ - Word16 delta_flag, /* i : Flag for 1st (or 3rd) subframe */ - Flag *pOverflow /* o : overflow indicator */ -) -{ - Word16 index; - Word16 i; - Word16 temp; - - if (delta_flag == 0) /* if 1st or 3rd subframe */ - { - /* encode pitch delay (with fraction) */ - if (T0 <= 94) - { - /* index = T0*6 - 105 + T0_frac */ - i = 6 * T0 - 105; - - index = add(i, T0_frac, pOverflow); - } - else - { - index = add(T0, 368, pOverflow); - } - - } - else - /* if second or fourth subframe */ - { - /* index = 6*(T0-T0_min) + 3 + T0_frac */ - temp = sub(T0, T0_min, pOverflow); - - i = add(temp, temp, pOverflow); - i = add(temp, i, pOverflow); - i = add(i, i, pOverflow); - - i = add(i, 3, pOverflow); - - index = add(i, T0_frac, pOverflow); - } - - return index; -} |