| /* ------------------------------------------------------------------ |
| * 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; |
| } |