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Diffstat (limited to 'ffmpeg1/libavcodec/g722.c')
| -rw-r--r-- | ffmpeg1/libavcodec/g722.c | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/ffmpeg1/libavcodec/g722.c b/ffmpeg1/libavcodec/g722.c deleted file mode 100644 index 2c04c40..0000000 --- a/ffmpeg1/libavcodec/g722.c +++ /dev/null @@ -1,171 +0,0 @@ -/* - * G.722 ADPCM audio encoder/decoder - * - * Copyright (c) CMU 1993 Computer Science, Speech Group - * Chengxiang Lu and Alex Hauptmann - * Copyright (c) 2005 Steve Underwood <steveu at coppice.org> - * Copyright (c) 2009 Kenan Gillet - * Copyright (c) 2010 Martin Storsjo - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * G.722 ADPCM audio codec - * - * This G.722 decoder is a bit-exact implementation of the ITU G.722 - * specification for all three specified bitrates - 64000bps, 56000bps - * and 48000bps. It passes the ITU tests. - * - * @note For the 56000bps and 48000bps bitrates, the lowest 1 or 2 bits - * respectively of each byte are ignored. - */ - -#include "mathops.h" -#include "g722.h" - -static const int8_t sign_lookup[2] = { -1, 1 }; - -static const int16_t inv_log2_table[32] = { - 2048, 2093, 2139, 2186, 2233, 2282, 2332, 2383, - 2435, 2489, 2543, 2599, 2656, 2714, 2774, 2834, - 2896, 2960, 3025, 3091, 3158, 3228, 3298, 3371, - 3444, 3520, 3597, 3676, 3756, 3838, 3922, 4008 -}; -static const int16_t high_log_factor_step[2] = { 798, -214 }; -const int16_t ff_g722_high_inv_quant[4] = { -926, -202, 926, 202 }; -/** - * low_log_factor_step[index] == wl[rl42[index]] - */ -static const int16_t low_log_factor_step[16] = { - -60, 3042, 1198, 538, 334, 172, 58, -30, - 3042, 1198, 538, 334, 172, 58, -30, -60 -}; -const int16_t ff_g722_low_inv_quant4[16] = { - 0, -2557, -1612, -1121, -786, -530, -323, -150, - 2557, 1612, 1121, 786, 530, 323, 150, 0 -}; -const int16_t ff_g722_low_inv_quant6[64] = { - -17, -17, -17, -17, -3101, -2738, -2376, -2088, - -1873, -1689, -1535, -1399, -1279, -1170, -1072, -982, - -899, -822, -750, -682, -618, -558, -501, -447, - -396, -347, -300, -254, -211, -170, -130, -91, - 3101, 2738, 2376, 2088, 1873, 1689, 1535, 1399, - 1279, 1170, 1072, 982, 899, 822, 750, 682, - 618, 558, 501, 447, 396, 347, 300, 254, - 211, 170, 130, 91, 54, 17, -54, -17 -}; - -/** - * quadrature mirror filter (QMF) coefficients - * - * ITU-T G.722 Table 11 - */ -static const int16_t qmf_coeffs[12] = { - 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11, -}; - - -/** - * adaptive predictor - * - * @param cur_diff the dequantized and scaled delta calculated from the - * current codeword - */ -static void do_adaptive_prediction(struct G722Band *band, const int cur_diff) -{ - int sg[2], limit, i, cur_qtzd_reconst; - - const int cur_part_reconst = band->s_zero + cur_diff < 0; - - sg[0] = sign_lookup[cur_part_reconst != band->part_reconst_mem[0]]; - sg[1] = sign_lookup[cur_part_reconst == band->part_reconst_mem[1]]; - band->part_reconst_mem[1] = band->part_reconst_mem[0]; - band->part_reconst_mem[0] = cur_part_reconst; - - band->pole_mem[1] = av_clip((sg[0] * av_clip(band->pole_mem[0], -8191, 8191) >> 5) + - (sg[1] << 7) + (band->pole_mem[1] * 127 >> 7), -12288, 12288); - - limit = 15360 - band->pole_mem[1]; - band->pole_mem[0] = av_clip(-192 * sg[0] + (band->pole_mem[0] * 255 >> 8), -limit, limit); - - - if (cur_diff) { - for (i = 0; i < 6; i++) - band->zero_mem[i] = ((band->zero_mem[i]*255) >> 8) + - ((band->diff_mem[i]^cur_diff) < 0 ? -128 : 128); - } else - for (i = 0; i < 6; i++) - band->zero_mem[i] = (band->zero_mem[i]*255) >> 8; - - for (i = 5; i > 0; i--) - band->diff_mem[i] = band->diff_mem[i-1]; - band->diff_mem[0] = av_clip_int16(cur_diff << 1); - - band->s_zero = 0; - for (i = 5; i >= 0; i--) - band->s_zero += (band->zero_mem[i]*band->diff_mem[i]) >> 15; - - - cur_qtzd_reconst = av_clip_int16((band->s_predictor + cur_diff) << 1); - band->s_predictor = av_clip_int16(band->s_zero + - (band->pole_mem[0] * cur_qtzd_reconst >> 15) + - (band->pole_mem[1] * band->prev_qtzd_reconst >> 15)); - band->prev_qtzd_reconst = cur_qtzd_reconst; -} - -static inline int linear_scale_factor(const int log_factor) -{ - const int wd1 = inv_log2_table[(log_factor >> 6) & 31]; - const int shift = log_factor >> 11; - return shift < 0 ? wd1 >> -shift : wd1 << shift; -} - -void ff_g722_update_low_predictor(struct G722Band *band, const int ilow) -{ - do_adaptive_prediction(band, - band->scale_factor * ff_g722_low_inv_quant4[ilow] >> 10); - - // quantizer adaptation - band->log_factor = av_clip((band->log_factor * 127 >> 7) + - low_log_factor_step[ilow], 0, 18432); - band->scale_factor = linear_scale_factor(band->log_factor - (8 << 11)); -} - -void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh, - const int ihigh) -{ - do_adaptive_prediction(band, dhigh); - - // quantizer adaptation - band->log_factor = av_clip((band->log_factor * 127 >> 7) + - high_log_factor_step[ihigh&1], 0, 22528); - band->scale_factor = linear_scale_factor(band->log_factor - (10 << 11)); -} - -void ff_g722_apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2) -{ - int i; - - *xout1 = 0; - *xout2 = 0; - for (i = 0; i < 12; i++) { - MAC16(*xout2, prev_samples[2*i ], qmf_coeffs[i ]); - MAC16(*xout1, prev_samples[2*i+1], qmf_coeffs[11-i]); - } -} |