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Diffstat (limited to 'media/libstagefright/codecs/amrnb/common/src/reorder.cpp')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/common/src/reorder.cpp | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/common/src/reorder.cpp b/media/libstagefright/codecs/amrnb/common/src/reorder.cpp new file mode 100644 index 0000000..b1e4711 --- /dev/null +++ b/media/libstagefright/codecs/amrnb/common/src/reorder.cpp @@ -0,0 +1,199 @@ +/* ------------------------------------------------------------------ + * 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. +****************************************************************************************/ +/* + Filename: /audio/gsm_amr/c/src/reorder.c + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: + 1. Eliminated unused include file add.h. + 2. Replaced array addressing by pointers + 3. Eliminated math operations that unnecessary checked for + saturation + 4. Replaced loop counter with decrement loops + + Description: Replaced "int" and/or "char" with OSCL defined types. + + Who: Date: + Description: + +------------------------------------------------------------------------------ +*/ + + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "reorder.h" + +/*---------------------------------------------------------------------------- +; MACROS +; [Define module specific macros here] +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; DEFINES +; [Include all pre-processor statements here. Include conditional +; compile variables also.] +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL FUNCTION DEFINITIONS +; [List function prototypes here] +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL VARIABLE DEFINITIONS +; [Variable declaration - defined here and used outside this module] +----------------------------------------------------------------------------*/ + + +/* +------------------------------------------------------------------------------ + FUNCTION NAME: Reorder_lsf +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + lsf = vector of LSFs (range: 0<=val<=0.5)(Word16) + min_dist = minimum required distance (Word16) + n = LPC order (Word16) + pOverflow = pointer to overflow (Flag) + + Outputs: + pOverflow -> 1 if the add operation called by Reorder_lsf() results in + overflow + lsf -> reordered vector of LSFs (Word16) + + Returns: + None + + Global Variables Used: + None + + Local Variables Needed: + None + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + This function makes sure that the LSFs are properly ordered keeps a certain + minimum distance between adjacent LSFs. + +------------------------------------------------------------------------------ + REQUIREMENTS + + None + +------------------------------------------------------------------------------ + REFERENCES + + [1] reorder.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 + +------------------------------------------------------------------------------ + PSEUDO-CODE + +void Reorder_lsf ( + Word16 *lsf, // (i/o) : vector of LSFs (range: 0<=val<=0.5) + Word16 min_dist, // (i) : minimum required distance + Word16 n // (i) : LPC order +) +{ + Word16 i; + Word16 lsf_min; + +// The reference ETSI code uses a global flag for Overflow. In the actual +// implementation a pointer to Overflow flag is passed into the function +// for use by the math functions add() and sub() + + lsf_min = min_dist; + for (i = 0; i < n; i++) + { + if (sub (lsf[i], lsf_min) < 0) + { + lsf[i] = lsf_min; + } + lsf_min = add (lsf[i], min_dist); + } +} + +------------------------------------------------------------------------------ + 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] + +------------------------------------------------------------------------------ +*/ + +/*---------------------------------------------------------------------------- +; FUNCTION CODE +----------------------------------------------------------------------------*/ +void Reorder_lsf( + Word16 *lsf, /* (i/o) : vector of LSFs (range: 0<=val<=0.5) */ + Word16 min_dist, /* (i) : minimum required distance */ + Word16 n, /* (i) : LPC order */ + Flag *pOverflow /* (i/o) : Overflow flag */ +) +{ + Word16 i; + Word16 lsf_min; + Word16 *p_lsf = &lsf[0]; + OSCL_UNUSED_ARG(pOverflow); + + lsf_min = min_dist; + for (i = 0; i < n; i++) + { + if (*(p_lsf) < lsf_min) + { + *(p_lsf++) = lsf_min; + lsf_min += min_dist; + } + else + { + lsf_min = *(p_lsf++) + min_dist; + } + } +} + |