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author | Andreas Huber <andih@google.com> | 2009-12-08 15:40:06 -0800 |
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committer | Andreas Huber <andih@google.com> | 2009-12-10 12:23:55 -0800 |
commit | 4f1efc098cb5791c3e9f483f2af84aef70d2d0a0 (patch) | |
tree | a2873e84aed3eecb1198f85954e24cddb1bdc380 /media/libstagefright/codecs/amrnb/dec/src/wmf_to_ets.cpp | |
parent | c54176addef15699a518b69cd6bbd40ffc95e72e (diff) | |
download | frameworks_av-4f1efc098cb5791c3e9f483f2af84aef70d2d0a0.zip frameworks_av-4f1efc098cb5791c3e9f483f2af84aef70d2d0a0.tar.gz frameworks_av-4f1efc098cb5791c3e9f483f2af84aef70d2d0a0.tar.bz2 |
Initial check in of AMR (NB and WB) decoders based on PV source code.
Diffstat (limited to 'media/libstagefright/codecs/amrnb/dec/src/wmf_to_ets.cpp')
-rw-r--r-- | media/libstagefright/codecs/amrnb/dec/src/wmf_to_ets.cpp | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/dec/src/wmf_to_ets.cpp b/media/libstagefright/codecs/amrnb/dec/src/wmf_to_ets.cpp new file mode 100644 index 0000000..4dfbb67 --- /dev/null +++ b/media/libstagefright/codecs/amrnb/dec/src/wmf_to_ets.cpp @@ -0,0 +1,190 @@ +/* ------------------------------------------------------------------ + * 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/wmf_to_ets.c + Funtions: wmf_to_ets + + Date: 01/21/2002 + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Changing mode to frame_type_3gpp for DTX support. Modifying for + loops for optimized code. Updating as per review comments. + + Description: Changed MRDTX to AMR_SID in the code and added bitreorder_tab.h + in the Include section. + + Description: + +------------------------------------------------------------------------------ +*/ + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "frame_type_3gpp.h" +#include "wmf_to_ets.h" +#include "typedef.h" +#include "bitreorder_tab.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: wmf_to_ets +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + frame_type_3gpp = decoder speech bit rate (enum Frame_Type_3GPP) + wmf_input_ptr = pointer to input encoded speech bits in WMF (non-IF2) format + (Word8) + ets_output_ptr = pointer to output encoded speech bits in ETS format (Word16) + + Outputs: + ets_output_ptr = pointer to encoded speech bits in the ETS format (Word16) + + Returns: + None + + Global Variables Used: + None + + Local Variables Needed: + None + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + This function performs a transformation on the data buffers. It converts the + data format from WMF (non-IF2) (Wireless Multi-media Forum) to ETS (European + Telecommunication Standard). WMF format has the encoded speech bits byte + aligned with MSB to LSB going left to right. ETS format has the encoded speech + bits each separate with only one bit stored in each word. + +------------------------------------------------------------------------------ + REQUIREMENTS + + None + +------------------------------------------------------------------------------ + REFERENCES + +AMR Speech Codec Frame Structure", 3GPP TS 26.101 version 4.1.0 Release 4, June 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] + +------------------------------------------------------------------------------ +*/ + +void wmf_to_ets( + enum Frame_Type_3GPP frame_type_3gpp, + UWord8 *wmf_input_ptr, + Word16 *ets_output_ptr) +{ + + Word16 i; + + /* + * The following section of code accesses bits in the WMF method of + * bit ordering. Each bit is given its own location in the buffer pointed + * to by ets_output_ptr. If the frame_type_3gpp is less than MRDTX then + * the elements are reordered within the buffer pointed to by ets_output_ptr. + */ + + if (frame_type_3gpp < AMR_SID) + { + /* The table numOfBits[] can be found in bitreorder.c. */ + for (i = numOfBits[frame_type_3gpp] - 1; i >= 0; i--) + { + /* The table reorderBits[][] can be found in bitreorder.c. */ + ets_output_ptr[reorderBits[frame_type_3gpp][i]] = + (wmf_input_ptr[i>>3] >> ((~i) & 0x7)) & 0x01; + } + } + else + { + /* The table numOfBits[] can be found in bitreorder.c. */ + for (i = numOfBits[frame_type_3gpp] - 1; i >= 0; i--) + { + ets_output_ptr[i] = (wmf_input_ptr[i>>3] >> ((~i) & 0x7)) & 0x01; + } + } + + return; +} |