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Diffstat (limited to '')
| -rw-r--r-- | third_party/libwebrtc/modules/audio_coding/codecs/ilbc/unpack_bits.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/unpack_bits.c b/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/unpack_bits.c new file mode 100644 index 0000000000..a9a0147b9d --- /dev/null +++ b/third_party/libwebrtc/modules/audio_coding/codecs/ilbc/unpack_bits.c @@ -0,0 +1,241 @@ +/* + * 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); + } +} |