/* ------------------------------------------------------------------ * 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_wmf.c Funtions: ets_to_wmf Date: 01/23/2002 ------------------------------------------------------------------------------ REVISION HISTORY Description: Modified code as per review comments regarding things such as adding the tables in bitreorder_tab.c to the Global section of the input/output section of the template and removing the #define of 244 since it wasn't needed in this function. Description: Fixed the loop that packs the last octet of the WMF output. Description: Replaced "int" and/or "char" with OSCL defined types. Description: ------------------------------------------------------------------------------ */ /*---------------------------------------------------------------------------- ; INCLUDES ----------------------------------------------------------------------------*/ #include "ets_to_wmf.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_wmf ------------------------------------------------------------------------------ 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) wmf_output_ptr = pointer to output encoded speech bits in WMF format(UWord8) Outputs: wmf_output_ptr = pointer to encoded speech bits in the WMF format (UWord8) Returns: None Global Variables Used: numOfBits = table of values that describe the number of bits per frame for each 3GPP frame type mode. The table is type const Word16 and has NUM_MODES elements. This table is located in bitreorder_tab.c. reorderBits = table of pointers that point to tables used to reorder the encoded speech bits when converting from ETS to WMF or IF2 format. The table is of type const Word16 * and contains NUM_MODES-1 elements. This table is located in bitreorder_tab.c. 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 WMF (wireless multimedia forum). ETS format has the encoded speech bits each separate with only one bit stored in each word. WMF is the storage format where the frame type is in the first four bits of the first byte. This first byte has the upper four bits as padded zeroes. 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 None ------------------------------------------------------------------------------ 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_wmf( enum Frame_Type_3GPP frame_type_3gpp, Word16 *ets_input_ptr, UWord8 *wmf_output_ptr) { Word16 i; Word16 k = 0; Word16 j = 0; Word16 *ptr_temp; Word16 bits_left; UWord8 accum; if (frame_type_3gpp < AMR_SID) { wmf_output_ptr[j++] = (UWord8)(frame_type_3gpp) & 0x0f; for (i = 0; i < numOfBits[frame_type_3gpp] - 7;) { wmf_output_ptr[j] = (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 7; wmf_output_ptr[j] |= (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 6; wmf_output_ptr[j] |= (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 5; wmf_output_ptr[j] |= (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 4; wmf_output_ptr[j] |= (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 3; wmf_output_ptr[j] |= (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 2; wmf_output_ptr[j] |= (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << 1; wmf_output_ptr[j++] |= (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]]; } bits_left = numOfBits[frame_type_3gpp] - (numOfBits[frame_type_3gpp] & 0xFFF8); wmf_output_ptr[j] = 0; for (k = 0; k < bits_left; k++) { wmf_output_ptr[j] |= (UWord8) ets_input_ptr[reorderBits[frame_type_3gpp][i++]] << (7 - k); } } else { wmf_output_ptr[j++] = (UWord8)(frame_type_3gpp) & 0x0f; ptr_temp = &ets_input_ptr[0]; for (i = numOfBits[frame_type_3gpp] - 7; i > 0; i -= 8) { accum = (UWord8) * (ptr_temp++) << 7; accum |= (UWord8) * (ptr_temp++) << 6; accum |= (UWord8) * (ptr_temp++) << 5; accum |= (UWord8) * (ptr_temp++) << 4; accum |= (UWord8) * (ptr_temp++) << 3; accum |= (UWord8) * (ptr_temp++) << 2; accum |= (UWord8) * (ptr_temp++) << 1; accum |= (UWord8) * (ptr_temp++); wmf_output_ptr[j++] = accum; } bits_left = numOfBits[frame_type_3gpp] - (numOfBits[frame_type_3gpp] & 0xFFF8); wmf_output_ptr[j] = 0; for (i = 0; i < bits_left; i++) { wmf_output_ptr[j] |= *(ptr_temp++) << (7 - i); } } return; }