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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/******************************************************************
iLBC Speech Coder ANSI-C Source Code
WebRtcIlbcfix_UnpackBits.c
******************************************************************/
#include "modules/audio_coding/codecs/ilbc/unpack_bits.h"
#include "modules/audio_coding/codecs/ilbc/defines.h"
/*----------------------------------------------------------------*
* unpacking of bits from bitstream, i.e., vector of bytes
*---------------------------------------------------------------*/
int16_t WebRtcIlbcfix_UnpackBits( /* (o) "Empty" frame indicator */
const uint16_t *bitstream, /* (i) The packatized bitstream */
iLBC_bits *enc_bits, /* (o) Paramerers from bitstream */
int16_t mode /* (i) Codec mode (20 or 30) */
) {
const uint16_t *bitstreamPtr;
int i, k;
int16_t *tmpPtr;
bitstreamPtr=bitstream;
/* First int16_t */
enc_bits->lsf[0] = (*bitstreamPtr)>>10; /* Bit 0..5 */
enc_bits->lsf[1] = ((*bitstreamPtr)>>3)&0x7F; /* Bit 6..12 */
enc_bits->lsf[2] = ((*bitstreamPtr)&0x7)<<4; /* Bit 13..15 */
bitstreamPtr++;
/* Second int16_t */
enc_bits->lsf[2] |= ((*bitstreamPtr)>>12)&0xF; /* Bit 0..3 */
if (mode==20) {
enc_bits->startIdx = ((*bitstreamPtr)>>10)&0x3; /* Bit 4..5 */
enc_bits->state_first = ((*bitstreamPtr)>>9)&0x1; /* Bit 6 */
enc_bits->idxForMax = ((*bitstreamPtr)>>3)&0x3F; /* Bit 7..12 */
enc_bits->cb_index[0] = ((*bitstreamPtr)&0x7)<<4; /* Bit 13..15 */
bitstreamPtr++;
/* Third int16_t */
enc_bits->cb_index[0] |= ((*bitstreamPtr)>>12)&0xE; /* Bit 0..2 */
enc_bits->gain_index[0] = ((*bitstreamPtr)>>8)&0x18; /* Bit 3..4 */
enc_bits->gain_index[1] = ((*bitstreamPtr)>>7)&0x8; /* Bit 5 */
enc_bits->cb_index[3] = ((*bitstreamPtr)>>2)&0xFE; /* Bit 6..12 */
enc_bits->gain_index[3] = ((*bitstreamPtr)<<2)&0x10; /* Bit 13 */
enc_bits->gain_index[4] = ((*bitstreamPtr)<<2)&0x8; /* Bit 14 */
enc_bits->gain_index[6] = ((*bitstreamPtr)<<4)&0x10; /* Bit 15 */
} else { /* mode==30 */
enc_bits->lsf[3] = ((*bitstreamPtr)>>6)&0x3F; /* Bit 4..9 */
enc_bits->lsf[4] = ((*bitstreamPtr)<<1)&0x7E; /* Bit 10..15 */
bitstreamPtr++;
/* Third int16_t */
enc_bits->lsf[4] |= ((*bitstreamPtr)>>15)&0x1; /* Bit 0 */
enc_bits->lsf[5] = ((*bitstreamPtr)>>8)&0x7F; /* Bit 1..7 */
enc_bits->startIdx = ((*bitstreamPtr)>>5)&0x7; /* Bit 8..10 */
enc_bits->state_first = ((*bitstreamPtr)>>4)&0x1; /* Bit 11 */
enc_bits->idxForMax = ((*bitstreamPtr)<<2)&0x3C; /* Bit 12..15 */
bitstreamPtr++;
/* 4:th int16_t */
enc_bits->idxForMax |= ((*bitstreamPtr)>>14)&0x3; /* Bit 0..1 */
enc_bits->cb_index[0] = ((*bitstreamPtr)>>7)&0x78; /* Bit 2..5 */
enc_bits->gain_index[0] = ((*bitstreamPtr)>>5)&0x10; /* Bit 6 */
enc_bits->gain_index[1] = ((*bitstreamPtr)>>5)&0x8; /* Bit 7 */
enc_bits->cb_index[3] = ((*bitstreamPtr))&0xFC; /* Bit 8..13 */
enc_bits->gain_index[3] = ((*bitstreamPtr)<<3)&0x10; /* Bit 14 */
enc_bits->gain_index[4] = ((*bitstreamPtr)<<3)&0x8; /* Bit 15 */
}
/* Class 2 bits of ULP */
/* 4:th to 6:th int16_t for 20 ms case
5:th to 7:th int16_t for 30 ms case */
bitstreamPtr++;
tmpPtr=enc_bits->idxVec;
for (k=0; k<3; k++) {
for (i=15; i>=0; i--) {
(*tmpPtr) = (((*bitstreamPtr)>>i)<<2)&0x4;
/* Bit 15-i */
tmpPtr++;
}
bitstreamPtr++;
}
if (mode==20) {
/* 7:th int16_t */
for (i=15; i>6; i--) {
(*tmpPtr) = (((*bitstreamPtr)>>i)<<2)&0x4;
/* Bit 15-i */
tmpPtr++;
}
enc_bits->gain_index[1] |= ((*bitstreamPtr)>>4)&0x4; /* Bit 9 */
enc_bits->gain_index[3] |= ((*bitstreamPtr)>>2)&0xC; /* Bit 10..11 */
enc_bits->gain_index[4] |= ((*bitstreamPtr)>>1)&0x4; /* Bit 12 */
enc_bits->gain_index[6] |= ((*bitstreamPtr)<<1)&0x8; /* Bit 13 */
enc_bits->gain_index[7] = ((*bitstreamPtr)<<2)&0xC; /* Bit 14..15 */
} else { /* mode==30 */
/* 8:th int16_t */
for (i=15; i>5; i--) {
(*tmpPtr) = (((*bitstreamPtr)>>i)<<2)&0x4;
/* Bit 15-i */
tmpPtr++;
}
enc_bits->cb_index[0] |= ((*bitstreamPtr)>>3)&0x6; /* Bit 10..11 */
enc_bits->gain_index[0] |= ((*bitstreamPtr))&0x8; /* Bit 12 */
enc_bits->gain_index[1] |= ((*bitstreamPtr))&0x4; /* Bit 13 */
enc_bits->cb_index[3] |= ((*bitstreamPtr))&0x2; /* Bit 14 */
enc_bits->cb_index[6] = ((*bitstreamPtr)<<7)&0x80; /* Bit 15 */
bitstreamPtr++;
/* 9:th int16_t */
enc_bits->cb_index[6] |= ((*bitstreamPtr)>>9)&0x7E; /* Bit 0..5 */
enc_bits->cb_index[9] = ((*bitstreamPtr)>>2)&0xFE; /* Bit 6..12 */
enc_bits->cb_index[12] = ((*bitstreamPtr)<<5)&0xE0; /* Bit 13..15 */
bitstreamPtr++;
/* 10:th int16_t */
enc_bits->cb_index[12] |= ((*bitstreamPtr)>>11)&0x1E;/* Bit 0..3 */
enc_bits->gain_index[3] |= ((*bitstreamPtr)>>8)&0xC; /* Bit 4..5 */
enc_bits->gain_index[4] |= ((*bitstreamPtr)>>7)&0x6; /* Bit 6..7 */
enc_bits->gain_index[6] = ((*bitstreamPtr)>>3)&0x18; /* Bit 8..9 */
enc_bits->gain_index[7] = ((*bitstreamPtr)>>2)&0xC; /* Bit 10..11 */
enc_bits->gain_index[9] = ((*bitstreamPtr)<<1)&0x10; /* Bit 12 */
enc_bits->gain_index[10] = ((*bitstreamPtr)<<1)&0x8; /* Bit 13 */
enc_bits->gain_index[12] = ((*bitstreamPtr)<<3)&0x10; /* Bit 14 */
enc_bits->gain_index[13] = ((*bitstreamPtr)<<3)&0x8; /* Bit 15 */
}
bitstreamPtr++;
/* Class 3 bits of ULP */
/* 8:th to 14:th int16_t for 20 ms case
11:th to 17:th int16_t for 30 ms case */
tmpPtr=enc_bits->idxVec;
for (k=0; k<7; k++) {
for (i=14; i>=0; i-=2) {
(*tmpPtr) |= ((*bitstreamPtr)>>i)&0x3; /* Bit 15-i..14-i*/
tmpPtr++;
}
bitstreamPtr++;
}
if (mode==20) {
/* 15:th int16_t */
enc_bits->idxVec[56] |= ((*bitstreamPtr)>>14)&0x3; /* Bit 0..1 */
enc_bits->cb_index[0] |= ((*bitstreamPtr)>>13)&0x1; /* Bit 2 */
enc_bits->cb_index[1] = ((*bitstreamPtr)>>6)&0x7F; /* Bit 3..9 */
enc_bits->cb_index[2] = ((*bitstreamPtr)<<1)&0x7E; /* Bit 10..15 */
bitstreamPtr++;
/* 16:th int16_t */
enc_bits->cb_index[2] |= ((*bitstreamPtr)>>15)&0x1; /* Bit 0 */
enc_bits->gain_index[0] |= ((*bitstreamPtr)>>12)&0x7; /* Bit 1..3 */
enc_bits->gain_index[1] |= ((*bitstreamPtr)>>10)&0x3; /* Bit 4..5 */
enc_bits->gain_index[2] = ((*bitstreamPtr)>>7)&0x7; /* Bit 6..8 */
enc_bits->cb_index[3] |= ((*bitstreamPtr)>>6)&0x1; /* Bit 9 */
enc_bits->cb_index[4] = ((*bitstreamPtr)<<1)&0x7E; /* Bit 10..15 */
bitstreamPtr++;
/* 17:th int16_t */
enc_bits->cb_index[4] |= ((*bitstreamPtr)>>15)&0x1; /* Bit 0 */
enc_bits->cb_index[5] = ((*bitstreamPtr)>>8)&0x7F; /* Bit 1..7 */
enc_bits->cb_index[6] = ((*bitstreamPtr))&0xFF; /* Bit 8..15 */
bitstreamPtr++;
/* 18:th int16_t */
enc_bits->cb_index[7] = (*bitstreamPtr)>>8; /* Bit 0..7 */
enc_bits->cb_index[8] = (*bitstreamPtr)&0xFF; /* Bit 8..15 */
bitstreamPtr++;
/* 19:th int16_t */
enc_bits->gain_index[3] |= ((*bitstreamPtr)>>14)&0x3; /* Bit 0..1 */
enc_bits->gain_index[4] |= ((*bitstreamPtr)>>12)&0x3; /* Bit 2..3 */
enc_bits->gain_index[5] = ((*bitstreamPtr)>>9)&0x7; /* Bit 4..6 */
enc_bits->gain_index[6] |= ((*bitstreamPtr)>>6)&0x7; /* Bit 7..9 */
enc_bits->gain_index[7] |= ((*bitstreamPtr)>>4)&0x3; /* Bit 10..11 */
enc_bits->gain_index[8] = ((*bitstreamPtr)>>1)&0x7; /* Bit 12..14 */
} else { /* mode==30 */
/* 18:th int16_t */
enc_bits->idxVec[56] |= ((*bitstreamPtr)>>14)&0x3; /* Bit 0..1 */
enc_bits->idxVec[57] |= ((*bitstreamPtr)>>12)&0x3; /* Bit 2..3 */
enc_bits->cb_index[0] |= ((*bitstreamPtr)>>11)&1; /* Bit 4 */
enc_bits->cb_index[1] = ((*bitstreamPtr)>>4)&0x7F; /* Bit 5..11 */
enc_bits->cb_index[2] = ((*bitstreamPtr)<<3)&0x78; /* Bit 12..15 */
bitstreamPtr++;
/* 19:th int16_t */
enc_bits->cb_index[2] |= ((*bitstreamPtr)>>13)&0x7; /* Bit 0..2 */
enc_bits->gain_index[0] |= ((*bitstreamPtr)>>10)&0x7; /* Bit 3..5 */
enc_bits->gain_index[1] |= ((*bitstreamPtr)>>8)&0x3; /* Bit 6..7 */
enc_bits->gain_index[2] = ((*bitstreamPtr)>>5)&0x7; /* Bit 8..10 */
enc_bits->cb_index[3] |= ((*bitstreamPtr)>>4)&0x1; /* Bit 11 */
enc_bits->cb_index[4] = ((*bitstreamPtr)<<3)&0x78; /* Bit 12..15 */
bitstreamPtr++;
/* 20:th int16_t */
enc_bits->cb_index[4] |= ((*bitstreamPtr)>>13)&0x7; /* Bit 0..2 */
enc_bits->cb_index[5] = ((*bitstreamPtr)>>6)&0x7F; /* Bit 3..9 */
enc_bits->cb_index[6] |= ((*bitstreamPtr)>>5)&0x1; /* Bit 10 */
enc_bits->cb_index[7] = ((*bitstreamPtr)<<3)&0xF8; /* Bit 11..15 */
bitstreamPtr++;
/* 21:st int16_t */
enc_bits->cb_index[7] |= ((*bitstreamPtr)>>13)&0x7; /* Bit 0..2 */
enc_bits->cb_index[8] = ((*bitstreamPtr)>>5)&0xFF; /* Bit 3..10 */
enc_bits->cb_index[9] |= ((*bitstreamPtr)>>4)&0x1; /* Bit 11 */
enc_bits->cb_index[10] = ((*bitstreamPtr)<<4)&0xF0; /* Bit 12..15 */
bitstreamPtr++;
/* 22:nd int16_t */
enc_bits->cb_index[10] |= ((*bitstreamPtr)>>12)&0xF; /* Bit 0..3 */
enc_bits->cb_index[11] = ((*bitstreamPtr)>>4)&0xFF; /* Bit 4..11 */
enc_bits->cb_index[12] |= ((*bitstreamPtr)>>3)&0x1; /* Bit 12 */
enc_bits->cb_index[13] = ((*bitstreamPtr)<<5)&0xE0; /* Bit 13..15 */
bitstreamPtr++;
/* 23:rd int16_t */
enc_bits->cb_index[13] |= ((*bitstreamPtr)>>11)&0x1F;/* Bit 0..4 */
enc_bits->cb_index[14] = ((*bitstreamPtr)>>3)&0xFF; /* Bit 5..12 */
enc_bits->gain_index[3] |= ((*bitstreamPtr)>>1)&0x3; /* Bit 13..14 */
enc_bits->gain_index[4] |= ((*bitstreamPtr)&0x1); /* Bit 15 */
bitstreamPtr++;
/* 24:rd int16_t */
enc_bits->gain_index[5] = ((*bitstreamPtr)>>13)&0x7; /* Bit 0..2 */
enc_bits->gain_index[6] |= ((*bitstreamPtr)>>10)&0x7; /* Bit 3..5 */
enc_bits->gain_index[7] |= ((*bitstreamPtr)>>8)&0x3; /* Bit 6..7 */
enc_bits->gain_index[8] = ((*bitstreamPtr)>>5)&0x7; /* Bit 8..10 */
enc_bits->gain_index[9] |= ((*bitstreamPtr)>>1)&0xF; /* Bit 11..14 */
enc_bits->gain_index[10] |= ((*bitstreamPtr)<<2)&0x4; /* Bit 15 */
bitstreamPtr++;
/* 25:rd int16_t */
enc_bits->gain_index[10] |= ((*bitstreamPtr)>>14)&0x3; /* Bit 0..1 */
enc_bits->gain_index[11] = ((*bitstreamPtr)>>11)&0x7; /* Bit 2..4 */
enc_bits->gain_index[12] |= ((*bitstreamPtr)>>7)&0xF; /* Bit 5..8 */
enc_bits->gain_index[13] |= ((*bitstreamPtr)>>4)&0x7; /* Bit 9..11 */
enc_bits->gain_index[14] = ((*bitstreamPtr)>>1)&0x7; /* Bit 12..14 */
}
/* Last bit should be zero, otherwise it's an "empty" frame */
if (((*bitstreamPtr)&0x1) == 1) {
return(1);
} else {
return(0);
}
}