/* ------------------------------------------------------------------ * 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/if2_to_ets.c Funtions: if2_to_ets */ /*---------------------------------------------------------------------------- ; INCLUDES ----------------------------------------------------------------------------*/ #include "frame_type_3gpp.h" #include "if2_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: if2_to_ets ------------------------------------------------------------------------------ INPUT AND OUTPUT DEFINITIONS Inputs: frame_type_3gpp = decoder speech bit rate (enum Frame_Type_3GPP) if2_input_ptr = pointer to input encoded speech bits in 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 IF2 to ETS. 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. 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 if2_to_ets( enum Frame_Type_3GPP frame_type_3gpp, UWord8 *if2_input_ptr, Word16 *ets_output_ptr) { Word16 i; Word16 j; Word16 x = 0; /* * The following section of code accesses bits in the IF2 method of * bit ordering. Each bit is given its own location in the buffer pointed * to by ets_output_ptr. The bits (for modes less than AMR_SID) are * reordered using the tables in bitreorder.c before the data is stored * into the buffer pointed to by ets_output_ptr. */ if (frame_type_3gpp < AMR_SID) { for (j = 4; j < 8; j++) { ets_output_ptr[reorderBits[frame_type_3gpp][x++]] = (if2_input_ptr[0] >> j) & 0x01; } for (i = 1; i < numCompressedBytes[frame_type_3gpp]; i++) { for (j = 0; j < 8; j++) { if (x >= numOfBits[frame_type_3gpp]) { break; } ets_output_ptr[reorderBits[frame_type_3gpp][x++]] = (if2_input_ptr[i] >> j) & 0x01; } } } else { for (j = 4; j < 8; j++) { ets_output_ptr[x++] = (if2_input_ptr[0] >> j) & 0x01; } for (i = 1; i < numCompressedBytes[frame_type_3gpp]; i++) { for (j = 0; j < 8; j++) { ets_output_ptr[x++] = (if2_input_ptr[i] >> j) & 0x01; } } } return; }