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