| /* |
| * 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); |
| } |
| } |
