diff options
Diffstat (limited to 'libAACdec/src/usacdec_ace_d4t64.cpp')
| -rw-r--r-- | libAACdec/src/usacdec_ace_d4t64.cpp | 439 |
1 files changed, 439 insertions, 0 deletions
diff --git a/libAACdec/src/usacdec_ace_d4t64.cpp b/libAACdec/src/usacdec_ace_d4t64.cpp new file mode 100644 index 0000000..43e06cd --- /dev/null +++ b/libAACdec/src/usacdec_ace_d4t64.cpp @@ -0,0 +1,439 @@ +/* ----------------------------------------------------------------------------- +Software License for The Fraunhofer FDK AAC Codec Library for Android + +© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten +Forschung e.V. All rights reserved. + + 1. INTRODUCTION +The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software +that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding +scheme for digital audio. This FDK AAC Codec software is intended to be used on +a wide variety of Android devices. + +AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient +general perceptual audio codecs. AAC-ELD is considered the best-performing +full-bandwidth communications codec by independent studies and is widely +deployed. AAC has been standardized by ISO and IEC as part of the MPEG +specifications. + +Patent licenses for necessary patent claims for the FDK AAC Codec (including +those of Fraunhofer) may be obtained through Via Licensing +(www.vialicensing.com) or through the respective patent owners individually for +the purpose of encoding or decoding bit streams in products that are compliant +with the ISO/IEC MPEG audio standards. Please note that most manufacturers of +Android devices already license these patent claims through Via Licensing or +directly from the patent owners, and therefore FDK AAC Codec software may +already be covered under those patent licenses when it is used for those +licensed purposes only. + +Commercially-licensed AAC software libraries, including floating-point versions +with enhanced sound quality, are also available from Fraunhofer. Users are +encouraged to check the Fraunhofer website for additional applications +information and documentation. + +2. COPYRIGHT LICENSE + +Redistribution and use in source and binary forms, with or without modification, +are permitted without payment of copyright license fees provided that you +satisfy the following conditions: + +You must retain the complete text of this software license in redistributions of +the FDK AAC Codec or your modifications thereto in source code form. + +You must retain the complete text of this software license in the documentation +and/or other materials provided with redistributions of the FDK AAC Codec or +your modifications thereto in binary form. You must make available free of +charge copies of the complete source code of the FDK AAC Codec and your +modifications thereto to recipients of copies in binary form. + +The name of Fraunhofer may not be used to endorse or promote products derived +from this library without prior written permission. + +You may not charge copyright license fees for anyone to use, copy or distribute +the FDK AAC Codec software or your modifications thereto. + +Your modified versions of the FDK AAC Codec must carry prominent notices stating +that you changed the software and the date of any change. For modified versions +of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" +must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK +AAC Codec Library for Android." + +3. NO PATENT LICENSE + +NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without +limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. +Fraunhofer provides no warranty of patent non-infringement with respect to this +software. + +You may use this FDK AAC Codec software or modifications thereto only for +purposes that are authorized by appropriate patent licenses. + +4. DISCLAIMER + +This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright +holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, +including but not limited to the implied warranties of merchantability and +fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR +CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, +or consequential damages, including but not limited to procurement of substitute +goods or services; loss of use, data, or profits, or business interruption, +however caused and on any theory of liability, whether in contract, strict +liability, or tort (including negligence), arising in any way out of the use of +this software, even if advised of the possibility of such damage. + +5. CONTACT INFORMATION + +Fraunhofer Institute for Integrated Circuits IIS +Attention: Audio and Multimedia Departments - FDK AAC LL +Am Wolfsmantel 33 +91058 Erlangen, Germany + +www.iis.fraunhofer.de/amm +amm-info@iis.fraunhofer.de +----------------------------------------------------------------------------- */ + +/**************************** AAC decoder library ****************************** + + Author(s): + + Description: ACELP + +*******************************************************************************/ + +#include "usacdec_ace_d4t64.h" + +#define L_SUBFR 64 /* Subframe size */ + +/* + * D_ACELP_add_pulse + * + * Parameters: + * pos I: position of pulse + * nb_pulse I: number of pulses + * track I: track + * code O: fixed codebook + * + * Function: + * Add pulses to fixed codebook + * + * Returns: + * void + */ +static void D_ACELP_add_pulse(SHORT pos[], SHORT nb_pulse, SHORT track, + FIXP_COD code[]) { + SHORT i, k; + for (k = 0; k < nb_pulse; k++) { + /* i = ((pos[k] & (16-1))*NB_TRACK) + track; */ + i = ((pos[k] & (16 - 1)) << 2) + track; + if ((pos[k] & 16) == 0) { + code[i] = code[i] + (FIXP_COD)(512 << (COD_BITS - FRACT_BITS)); + } else { + code[i] = code[i] - (FIXP_COD)(512 << (COD_BITS - FRACT_BITS)); + } + } + return; +} +/* + * D_ACELP_decode_1p_N1 + * + * Parameters: + * index I: pulse index + * N I: number of bits for position + * offset I: offset + * pos O: position of the pulse + * + * Function: + * Decode 1 pulse with N+1 bits + * + * Returns: + * void + */ +static void D_ACELP_decode_1p_N1(LONG index, SHORT N, SHORT offset, + SHORT pos[]) { + SHORT pos1; + LONG i, mask; + + mask = ((1 << N) - 1); + /* + * Decode 1 pulse with N+1 bits + */ + pos1 = (SHORT)((index & mask) + offset); + i = ((index >> N) & 1); + if (i == 1) { + pos1 += 16; + } + pos[0] = pos1; + return; +} +/* + * D_ACELP_decode_2p_2N1 + * + * Parameters: + * index I: pulse index + * N I: number of bits for position + * offset I: offset + * pos O: position of the pulse + * + * Function: + * Decode 2 pulses with 2*N+1 bits + * + * Returns: + * void + */ +static void D_ACELP_decode_2p_2N1(LONG index, SHORT N, SHORT offset, + SHORT pos[]) { + SHORT pos1, pos2; + LONG mask, i; + mask = ((1 << N) - 1); + /* + * Decode 2 pulses with 2*N+1 bits + */ + pos1 = (SHORT)(((index >> N) & mask) + offset); + i = (index >> (2 * N)) & 1; + pos2 = (SHORT)((index & mask) + offset); + if ((pos2 - pos1) < 0) { + if (i == 1) { + pos1 += 16; + } else { + pos2 += 16; + } + } else { + if (i == 1) { + pos1 += 16; + pos2 += 16; + } + } + pos[0] = pos1; + pos[1] = pos2; + return; +} +/* + * D_ACELP_decode_3p_3N1 + * + * Parameters: + * index I: pulse index + * N I: number of bits for position + * offset I: offset + * pos O: position of the pulse + * + * Function: + * Decode 3 pulses with 3*N+1 bits + * + * Returns: + * void + */ +static void D_ACELP_decode_3p_3N1(LONG index, SHORT N, SHORT offset, + SHORT pos[]) { + SHORT j; + LONG mask, idx; + + /* + * Decode 3 pulses with 3*N+1 bits + */ + mask = ((1 << ((2 * N) - 1)) - 1); + idx = index & mask; + j = offset; + if (((index >> ((2 * N) - 1)) & 1) == 1) { + j += (1 << (N - 1)); + } + D_ACELP_decode_2p_2N1(idx, N - 1, j, pos); + mask = ((1 << (N + 1)) - 1); + idx = (index >> (2 * N)) & mask; + D_ACELP_decode_1p_N1(idx, N, offset, pos + 2); + return; +} +/* + * D_ACELP_decode_4p_4N1 + * + * Parameters: + * index I: pulse index + * N I: number of bits for position + * offset I: offset + * pos O: position of the pulse + * + * Function: + * Decode 4 pulses with 4*N+1 bits + * + * Returns: + * void + */ +static void D_ACELP_decode_4p_4N1(LONG index, SHORT N, SHORT offset, + SHORT pos[]) { + SHORT j; + LONG mask, idx; + /* + * Decode 4 pulses with 4*N+1 bits + */ + mask = ((1 << ((2 * N) - 1)) - 1); + idx = index & mask; + j = offset; + if (((index >> ((2 * N) - 1)) & 1) == 1) { + j += (1 << (N - 1)); + } + D_ACELP_decode_2p_2N1(idx, N - 1, j, pos); + mask = ((1 << ((2 * N) + 1)) - 1); + idx = (index >> (2 * N)) & mask; + D_ACELP_decode_2p_2N1(idx, N, offset, pos + 2); + return; +} +/* + * D_ACELP_decode_4p_4N + * + * Parameters: + * index I: pulse index + * N I: number of bits for position + * offset I: offset + * pos O: position of the pulse + * + * Function: + * Decode 4 pulses with 4*N bits + * + * Returns: + * void + */ +static void D_ACELP_decode_4p_4N(LONG index, SHORT N, SHORT offset, + SHORT pos[]) { + SHORT j, n_1; + /* + * Decode 4 pulses with 4*N bits + */ + n_1 = N - 1; + j = offset + (1 << n_1); + switch ((index >> ((4 * N) - 2)) & 3) { + case 0: + if (((index >> ((4 * n_1) + 1)) & 1) == 0) { + D_ACELP_decode_4p_4N1(index, n_1, offset, pos); + } else { + D_ACELP_decode_4p_4N1(index, n_1, j, pos); + } + break; + case 1: + D_ACELP_decode_1p_N1((index >> ((3 * n_1) + 1)), n_1, offset, pos); + D_ACELP_decode_3p_3N1(index, n_1, j, pos + 1); + break; + case 2: + D_ACELP_decode_2p_2N1((index >> ((2 * n_1) + 1)), n_1, offset, pos); + D_ACELP_decode_2p_2N1(index, n_1, j, pos + 2); + break; + case 3: + D_ACELP_decode_3p_3N1((index >> (n_1 + 1)), n_1, offset, pos); + D_ACELP_decode_1p_N1(index, n_1, j, pos + 3); + break; + } + return; +} + +/* + * D_ACELP_decode_4t + * + * Parameters: + * index I: index + * mode I: speech mode + * code I: (Q9) algebraic (fixed) codebook excitation + * + * Function: + * 20, 36, 44, 52, 64, 72, 88 bits algebraic codebook. + * 4 tracks x 16 positions per track = 64 samples. + * + * 20 bits 5+5+5+5 --> 4 pulses in a frame of 64 samples. + * 36 bits 9+9+9+9 --> 8 pulses in a frame of 64 samples. + * 44 bits 13+9+13+9 --> 10 pulses in a frame of 64 samples. + * 52 bits 13+13+13+13 --> 12 pulses in a frame of 64 samples. + * 64 bits 2+2+2+2+14+14+14+14 --> 16 pulses in a frame of 64 samples. + * 72 bits 10+2+10+2+10+14+10+14 --> 18 pulses in a frame of 64 samples. + * 88 bits 11+11+11+11+11+11+11+11 --> 24 pulses in a frame of 64 samples. + * + * All pulses can have two (2) possible amplitudes: +1 or -1. + * Each pulse can sixteen (16) possible positions. + * + * codevector length 64 + * number of track 4 + * number of position 16 + * + * Returns: + * void + */ +void D_ACELP_decode_4t64(SHORT index[], int nbits, FIXP_COD code[]) { + LONG L_index; + SHORT k, pos[6]; + + FDKmemclear(code, L_SUBFR * sizeof(FIXP_COD)); + + /* decode the positions and signs of pulses and build the codeword */ + switch (nbits) { + case 12: + for (k = 0; k < 4; k += 2) { + L_index = index[2 * (k / 2) + 1]; + D_ACELP_decode_1p_N1(L_index, 4, 0, pos); + D_ACELP_add_pulse(pos, 1, 2 * (index[2 * (k / 2)]) + k / 2, code); + } + break; + case 16: { + int i = 0; + int offset = index[i++]; + offset = (offset == 0) ? 1 : 3; + for (k = 0; k < 4; k++) { + if (k != offset) { + L_index = index[i++]; + D_ACELP_decode_1p_N1(L_index, 4, 0, pos); + D_ACELP_add_pulse(pos, 1, k, code); + } + } + } break; + case 20: + for (k = 0; k < 4; k++) { + L_index = (LONG)index[k]; + D_ACELP_decode_1p_N1(L_index, 4, 0, pos); + D_ACELP_add_pulse(pos, 1, k, code); + } + break; + case 28: + for (k = 0; k < 4 - 2; k++) { + L_index = (LONG)index[k]; + D_ACELP_decode_2p_2N1(L_index, 4, 0, pos); + D_ACELP_add_pulse(pos, 2, k, code); + } + for (k = 2; k < 4; k++) { + L_index = (LONG)index[k]; + D_ACELP_decode_1p_N1(L_index, 4, 0, pos); + D_ACELP_add_pulse(pos, 1, k, code); + } + break; + case 36: + for (k = 0; k < 4; k++) { + L_index = (LONG)index[k]; + D_ACELP_decode_2p_2N1(L_index, 4, 0, pos); + D_ACELP_add_pulse(pos, 2, k, code); + } + break; + case 44: + for (k = 0; k < 4 - 2; k++) { + L_index = (LONG)index[k]; + D_ACELP_decode_3p_3N1(L_index, 4, 0, pos); + D_ACELP_add_pulse(pos, 3, k, code); + } + for (k = 2; k < 4; k++) { + L_index = (LONG)index[k]; + D_ACELP_decode_2p_2N1(L_index, 4, 0, pos); + D_ACELP_add_pulse(pos, 2, k, code); + } + break; + case 52: + for (k = 0; k < 4; k++) { + L_index = (LONG)index[k]; + D_ACELP_decode_3p_3N1(L_index, 4, 0, pos); + D_ACELP_add_pulse(pos, 3, k, code); + } + break; + case 64: + for (k = 0; k < 4; k++) { + L_index = (((LONG)index[k] << 14) + (LONG)index[k + 4]); + D_ACELP_decode_4p_4N(L_index, 4, 0, pos); + D_ACELP_add_pulse(pos, 4, k, code); + } + break; + default: + FDK_ASSERT(0); + } + return; +} |