1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
18 /****************************************************************************************
19 Portions of this file are derived from the following 3GPP standard:
22 ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
23 Available from http://www.3gpp.org
25 (C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
26 Permission to distribute, modify and use this file under the standard license
27 terms listed above has been obtained from the copyright holder.
28 ****************************************************************************************/
30 ------------------------------------------------------------------------------
34 Filename: wmf_to_ets.cpp
37 ------------------------------------------------------------------------------
40 /*----------------------------------------------------------------------------
42 ----------------------------------------------------------------------------*/
43 #include "frame_type_3gpp.h"
44 #include "wmf_to_ets.h"
46 /*----------------------------------------------------------------------------
48 ; Define module specific macros here
49 ----------------------------------------------------------------------------*/
51 /*----------------------------------------------------------------------------
53 ; Include all pre-processor statements here. Include conditional
54 ; compile variables also.
55 ----------------------------------------------------------------------------*/
58 /*----------------------------------------------------------------------------
59 ; LOCAL FUNCTION DEFINITIONS
60 ; Function Prototype declaration
61 ----------------------------------------------------------------------------*/
63 /*----------------------------------------------------------------------------
64 ; LOCAL VARIABLE DEFINITIONS
65 ; Variable declaration - defined here and used outside this module
66 ----------------------------------------------------------------------------*/
71 ------------------------------------------------------------------------------
72 FUNCTION NAME: wmf_to_ets
73 ------------------------------------------------------------------------------
74 INPUT AND OUTPUT DEFINITIONS
77 frame_type_3gpp = decoder speech bit rate (enum Frame_Type_3GPP)
78 wmf_input_ptr = pointer to input encoded speech bits in WMF (non-IF2) format
80 ets_output_ptr = pointer to output encoded speech bits in ETS format (Word16)
83 ets_output_ptr = pointer to encoded speech bits in the ETS format (Word16)
88 Global Variables Used:
91 Local Variables Needed:
94 ------------------------------------------------------------------------------
97 This function performs a transformation on the data buffers. It converts the
98 data format from WMF (non-IF2) (Wireless Multi-media Forum) to ETS (European
99 Telecommunication Standard). WMF format has the encoded speech bits byte
100 aligned with MSB to LSB going left to right. ETS format has the encoded speech
101 bits each separate with only one bit stored in each word.
103 ------------------------------------------------------------------------------
108 ------------------------------------------------------------------------------
111 AMR Speech Codec Frame Structure", 3GPP TS 26.101 version 4.1.0 Release 4, June 2001
113 ------------------------------------------------------------------------------
118 ------------------------------------------------------------------------------
120 [State any special notes, constraints or cautions for users of this function]
122 ------------------------------------------------------------------------------
126 enum Frame_Type_3GPP frame_type_3gpp,
127 UWord8 *wmf_input_ptr,
128 Word16 *ets_output_ptr,
129 CommonAmrTbls* common_amr_tbls)
133 const Word16* const* reorderBits_ptr = common_amr_tbls->reorderBits_ptr;
134 const Word16* numOfBits_ptr = common_amr_tbls->numOfBits_ptr;
137 * The following section of code accesses bits in the WMF method of
138 * bit ordering. Each bit is given its own location in the buffer pointed
139 * to by ets_output_ptr. If the frame_type_3gpp is less than MRDTX then
140 * the elements are reordered within the buffer pointed to by ets_output_ptr.
143 if (frame_type_3gpp < AMR_SID)
145 /* The table numOfBits[] can be found in bitreorder.c. */
146 for (i = numOfBits_ptr[frame_type_3gpp] - 1; i >= 0; i--)
148 /* The table reorderBits[][] can be found in bitreorder.c. */
149 ets_output_ptr[reorderBits_ptr[frame_type_3gpp][i]] =
150 (wmf_input_ptr[i>>3] >> ((~i) & 0x7)) & 0x01;
155 /* The table numOfBits[] can be found in bitreorder.c. */
156 for (i = numOfBits_ptr[frame_type_3gpp] - 1; i >= 0; i--)
158 ets_output_ptr[i] = (wmf_input_ptr[i>>3] >> ((~i) & 0x7)) & 0x01;