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Diffstat (limited to 'media/libstagefright/codecs/amrnb/enc/src/ets_to_if2.cpp')
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1 files changed, 242 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/enc/src/ets_to_if2.cpp b/media/libstagefright/codecs/amrnb/enc/src/ets_to_if2.cpp new file mode 100644 index 0000000..01b8627 --- /dev/null +++ b/media/libstagefright/codecs/amrnb/enc/src/ets_to_if2.cpp @@ -0,0 +1,242 @@ +/* ------------------------------------------------------------------ + * 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/ets_to_if2.c + Funtions: ets_to_if2 + +*/ + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "frame_type_3gpp.h" +#include "ets_to_if2.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: ets_to_if2 +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + frame_type_3gpp = decoder speech bit rate (enum Frame_Type_3GPP) + ets_input_ptr = pointer to input encoded speech bits in ETS format (Word16) + if2_output_ptr = pointer to output encoded speech bits in IF2 format (UWord8) + + Outputs: + if2_output_ptr = pointer to encoded speech bits in the IF2 format (UWord8) + + 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 ETS (European Telecommunication Standard) to IF2. ETS format + has the encoded speech bits each separate with only one bit stored in each + word. IF2 is the storage format where the frame type is in the first four bits + of the first byte. The upper four bits of that byte contain the first four + encoded speech bits for the frame. The following bytes contain the rest of + the encoded speech bits. The final byte has padded zeros to make the frame + byte aligned. +------------------------------------------------------------------------------ + 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 ets_to_if2( + enum Frame_Type_3GPP frame_type_3gpp, + Word16 *ets_input_ptr, + UWord8 *if2_output_ptr) +{ + Word16 i; + Word16 k; + Word16 j = 0; + Word16 *ptr_temp; + Word16 bits_left; + UWord8 accum; + + if (frame_type_3gpp < AMR_SID) + { + if2_output_ptr[j++] = (UWord8)(frame_type_3gpp) | + (ets_input_ptr[reorderBits[frame_type_3gpp][0]] << 4) | + (ets_input_ptr[reorderBits[frame_type_3gpp][1]] << 5) | + (ets_input_ptr[reorderBits[frame_type_3gpp][2]] << 6) | + (ets_input_ptr[reorderBits[frame_type_3gpp][3]] << 7); + + for (i = 4; i < numOfBits[frame_type_3gpp] - 7;) + { + if2_output_ptr[j] = + (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]]; + if2_output_ptr[j] |= + (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 1; + if2_output_ptr[j] |= + (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 2; + if2_output_ptr[j] |= + (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 3; + if2_output_ptr[j] |= + (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 4; + if2_output_ptr[j] |= + (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 5; + if2_output_ptr[j] |= + (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 6; + if2_output_ptr[j++] |= + (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 7; + } + + bits_left = 4 + numOfBits[frame_type_3gpp] - + ((4 + numOfBits[frame_type_3gpp]) & 0xFFF8); + + if (bits_left != 0) + { + if2_output_ptr[j] = 0; + + for (k = 0; k < bits_left; k++) + { + if2_output_ptr[j] |= + (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << k; + } + } + } + else + { + if (frame_type_3gpp != AMR_NO_DATA) + { + /* First octet contains 3GPP frame type and */ + /* first 4 bits of encoded parameters */ + if2_output_ptr[j++] = (UWord8)(frame_type_3gpp) | + (ets_input_ptr[0] << 4) | (ets_input_ptr[1] << 5) | + (ets_input_ptr[2] << 6) | (ets_input_ptr[3] << 7); + ptr_temp = &ets_input_ptr[4]; + + bits_left = ((4 + numOfBits[frame_type_3gpp]) & 0xFFF8); + + for (i = (bits_left - 7) >> 3; i > 0; i--) + { + accum = (UWord8) * (ptr_temp++); + accum |= (UWord8) * (ptr_temp++) << 1; + accum |= (UWord8) * (ptr_temp++) << 2; + accum |= (UWord8) * (ptr_temp++) << 3; + accum |= (UWord8) * (ptr_temp++) << 4; + accum |= (UWord8) * (ptr_temp++) << 5; + accum |= (UWord8) * (ptr_temp++) << 6; + accum |= (UWord8) * (ptr_temp++) << 7; + + if2_output_ptr[j++] = accum; + } + + bits_left = 4 + numOfBits[frame_type_3gpp] - bits_left; + + if (bits_left != 0) + { + if2_output_ptr[j] = 0; + + for (i = 0; i < bits_left; i++) + { + if2_output_ptr[j] |= (ptr_temp[i] << i); + } + } + } + else + { + /* When there is no data, LSnibble of first octet */ + /* is the 3GPP frame type, MSnibble is zeroed out */ + if2_output_ptr[j++] = (UWord8)(frame_type_3gpp); + } + + } + + return; +} |