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584 lines
21 KiB
C
584 lines
21 KiB
C
/*
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* G.722 ADPCM audio encoder/decoder
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*
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* Copyright (c) CMU 1993 Computer Science, Speech Group
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* Chengxiang Lu and Alex Hauptmann
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* Copyright (c) 2005 Steve Underwood <steveu at coppice.org>
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* Copyright (c) 2009 Kenan Gillet
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* Copyright (c) 2010 Martin Storsjo
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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*
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* G.722 ADPCM audio codec
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*
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* This G.722 decoder is a bit-exact implementation of the ITU G.722
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* specification for all three specified bitrates - 64000bps, 56000bps
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* and 48000bps. It passes the ITU tests.
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*
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* @note For the 56000bps and 48000bps bitrates, the lowest 1 or 2 bits
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* respectively of each byte are ignored.
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*/
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#include "avcodec.h"
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#include "mathops.h"
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#include "get_bits.h"
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#define PREV_SAMPLES_BUF_SIZE 1024
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#define FREEZE_INTERVAL 128
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typedef struct {
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int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples
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int prev_samples_pos; ///< the number of values in prev_samples
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/**
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* The band[0] and band[1] correspond respectively to the lower band and higher band.
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*/
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struct G722Band {
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int16_t s_predictor; ///< predictor output value
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int32_t s_zero; ///< previous output signal from zero predictor
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int8_t part_reconst_mem[2]; ///< signs of previous partially reconstructed signals
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int16_t prev_qtzd_reconst; ///< previous quantized reconstructed signal (internal value, using low_inv_quant4)
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int16_t pole_mem[2]; ///< second-order pole section coefficient buffer
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int32_t diff_mem[6]; ///< quantizer difference signal memory
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int16_t zero_mem[6]; ///< Seventh-order zero section coefficient buffer
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int16_t log_factor; ///< delayed 2-logarithmic quantizer factor
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int16_t scale_factor; ///< delayed quantizer scale factor
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} band[2];
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struct TrellisNode {
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struct G722Band state;
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uint32_t ssd;
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int path;
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} *node_buf[2], **nodep_buf[2];
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struct TrellisPath {
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int value;
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int prev;
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} *paths[2];
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} G722Context;
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static const int8_t sign_lookup[2] = { -1, 1 };
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static const int16_t inv_log2_table[32] = {
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2048, 2093, 2139, 2186, 2233, 2282, 2332, 2383,
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2435, 2489, 2543, 2599, 2656, 2714, 2774, 2834,
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2896, 2960, 3025, 3091, 3158, 3228, 3298, 3371,
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3444, 3520, 3597, 3676, 3756, 3838, 3922, 4008
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};
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static const int16_t high_log_factor_step[2] = { 798, -214 };
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static const int16_t high_inv_quant[4] = { -926, -202, 926, 202 };
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/**
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* low_log_factor_step[index] == wl[rl42[index]]
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*/
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static const int16_t low_log_factor_step[16] = {
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-60, 3042, 1198, 538, 334, 172, 58, -30,
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3042, 1198, 538, 334, 172, 58, -30, -60
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};
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static const int16_t low_inv_quant4[16] = {
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0, -2557, -1612, -1121, -786, -530, -323, -150,
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2557, 1612, 1121, 786, 530, 323, 150, 0
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};
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static const int16_t low_inv_quant6[64] = {
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-17, -17, -17, -17, -3101, -2738, -2376, -2088,
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-1873, -1689, -1535, -1399, -1279, -1170, -1072, -982,
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-899, -822, -750, -682, -618, -558, -501, -447,
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-396, -347, -300, -254, -211, -170, -130, -91,
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3101, 2738, 2376, 2088, 1873, 1689, 1535, 1399,
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1279, 1170, 1072, 982, 899, 822, 750, 682,
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618, 558, 501, 447, 396, 347, 300, 254,
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211, 170, 130, 91, 54, 17, -54, -17
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};
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/**
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* quadrature mirror filter (QMF) coefficients
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*
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* ITU-T G.722 Table 11
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*/
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static const int16_t qmf_coeffs[12] = {
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3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11,
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};
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/**
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* adaptive predictor
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*
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* @param cur_diff the dequantized and scaled delta calculated from the
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* current codeword
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*/
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static void do_adaptive_prediction(struct G722Band *band, const int cur_diff)
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{
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int sg[2], limit, i, cur_qtzd_reconst;
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const int cur_part_reconst = band->s_zero + cur_diff < 0;
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sg[0] = sign_lookup[cur_part_reconst != band->part_reconst_mem[0]];
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sg[1] = sign_lookup[cur_part_reconst == band->part_reconst_mem[1]];
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band->part_reconst_mem[1] = band->part_reconst_mem[0];
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band->part_reconst_mem[0] = cur_part_reconst;
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band->pole_mem[1] = av_clip((sg[0] * av_clip(band->pole_mem[0], -8191, 8191) >> 5) +
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(sg[1] << 7) + (band->pole_mem[1] * 127 >> 7), -12288, 12288);
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limit = 15360 - band->pole_mem[1];
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band->pole_mem[0] = av_clip(-192 * sg[0] + (band->pole_mem[0] * 255 >> 8), -limit, limit);
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if (cur_diff) {
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for (i = 0; i < 6; i++)
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band->zero_mem[i] = ((band->zero_mem[i]*255) >> 8) +
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((band->diff_mem[i]^cur_diff) < 0 ? -128 : 128);
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} else
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for (i = 0; i < 6; i++)
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band->zero_mem[i] = (band->zero_mem[i]*255) >> 8;
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for (i = 5; i > 0; i--)
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band->diff_mem[i] = band->diff_mem[i-1];
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band->diff_mem[0] = av_clip_int16(cur_diff << 1);
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band->s_zero = 0;
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for (i = 5; i >= 0; i--)
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band->s_zero += (band->zero_mem[i]*band->diff_mem[i]) >> 15;
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cur_qtzd_reconst = av_clip_int16((band->s_predictor + cur_diff) << 1);
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band->s_predictor = av_clip_int16(band->s_zero +
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(band->pole_mem[0] * cur_qtzd_reconst >> 15) +
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(band->pole_mem[1] * band->prev_qtzd_reconst >> 15));
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band->prev_qtzd_reconst = cur_qtzd_reconst;
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}
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static int inline linear_scale_factor(const int log_factor)
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{
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const int wd1 = inv_log2_table[(log_factor >> 6) & 31];
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const int shift = log_factor >> 11;
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return shift < 0 ? wd1 >> -shift : wd1 << shift;
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}
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static void update_low_predictor(struct G722Band *band, const int ilow)
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{
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do_adaptive_prediction(band,
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band->scale_factor * low_inv_quant4[ilow] >> 10);
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// quantizer adaptation
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band->log_factor = av_clip((band->log_factor * 127 >> 7) +
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low_log_factor_step[ilow], 0, 18432);
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band->scale_factor = linear_scale_factor(band->log_factor - (8 << 11));
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}
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static void update_high_predictor(struct G722Band *band, const int dhigh,
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const int ihigh)
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{
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do_adaptive_prediction(band, dhigh);
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// quantizer adaptation
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band->log_factor = av_clip((band->log_factor * 127 >> 7) +
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high_log_factor_step[ihigh&1], 0, 22528);
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band->scale_factor = linear_scale_factor(band->log_factor - (10 << 11));
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}
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static void apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2)
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{
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int i;
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*xout1 = 0;
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*xout2 = 0;
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for (i = 0; i < 12; i++) {
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MAC16(*xout2, prev_samples[2*i ], qmf_coeffs[i ]);
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MAC16(*xout1, prev_samples[2*i+1], qmf_coeffs[11-i]);
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}
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}
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static av_cold int g722_init(AVCodecContext * avctx)
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{
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G722Context *c = avctx->priv_data;
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if (avctx->channels != 1) {
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av_log(avctx, AV_LOG_ERROR, "Only mono tracks are allowed.\n");
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return AVERROR_INVALIDDATA;
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}
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avctx->sample_fmt = AV_SAMPLE_FMT_S16;
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switch (avctx->bits_per_coded_sample) {
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case 8:
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case 7:
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case 6:
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break;
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default:
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av_log(avctx, AV_LOG_WARNING, "Unsupported bits_per_coded_sample [%d], "
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"assuming 8\n",
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avctx->bits_per_coded_sample);
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case 0:
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avctx->bits_per_coded_sample = 8;
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break;
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}
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c->band[0].scale_factor = 8;
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c->band[1].scale_factor = 2;
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c->prev_samples_pos = 22;
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if (avctx->lowres)
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avctx->sample_rate /= 2;
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if (avctx->trellis) {
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int frontier = 1 << avctx->trellis;
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int max_paths = frontier * FREEZE_INTERVAL;
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int i;
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for (i = 0; i < 2; i++) {
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c->paths[i] = av_mallocz(max_paths * sizeof(**c->paths));
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c->node_buf[i] = av_mallocz(2 * frontier * sizeof(**c->node_buf));
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c->nodep_buf[i] = av_mallocz(2 * frontier * sizeof(**c->nodep_buf));
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}
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}
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return 0;
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}
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static av_cold int g722_close(AVCodecContext *avctx)
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{
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G722Context *c = avctx->priv_data;
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int i;
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for (i = 0; i < 2; i++) {
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av_freep(&c->paths[i]);
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av_freep(&c->node_buf[i]);
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av_freep(&c->nodep_buf[i]);
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}
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return 0;
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}
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#if CONFIG_ADPCM_G722_DECODER
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static const int16_t low_inv_quant5[32] = {
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-35, -35, -2919, -2195, -1765, -1458, -1219, -1023,
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-858, -714, -587, -473, -370, -276, -190, -110,
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2919, 2195, 1765, 1458, 1219, 1023, 858, 714,
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587, 473, 370, 276, 190, 110, 35, -35
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};
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static const int16_t *low_inv_quants[3] = { low_inv_quant6, low_inv_quant5,
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low_inv_quant4 };
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static int g722_decode_frame(AVCodecContext *avctx, void *data,
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int *data_size, AVPacket *avpkt)
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{
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G722Context *c = avctx->priv_data;
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int16_t *out_buf = data;
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int j, out_len = 0;
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const int skip = 8 - avctx->bits_per_coded_sample;
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const int16_t *quantizer_table = low_inv_quants[skip];
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GetBitContext gb;
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init_get_bits(&gb, avpkt->data, avpkt->size * 8);
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for (j = 0; j < avpkt->size; j++) {
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int ilow, ihigh, rlow;
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ihigh = get_bits(&gb, 2);
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ilow = get_bits(&gb, 6 - skip);
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skip_bits(&gb, skip);
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rlow = av_clip((c->band[0].scale_factor * quantizer_table[ilow] >> 10)
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+ c->band[0].s_predictor, -16384, 16383);
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update_low_predictor(&c->band[0], ilow >> (2 - skip));
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if (!avctx->lowres) {
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const int dhigh = c->band[1].scale_factor *
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high_inv_quant[ihigh] >> 10;
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const int rhigh = av_clip(dhigh + c->band[1].s_predictor,
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-16384, 16383);
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int xout1, xout2;
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update_high_predictor(&c->band[1], dhigh, ihigh);
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c->prev_samples[c->prev_samples_pos++] = rlow + rhigh;
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c->prev_samples[c->prev_samples_pos++] = rlow - rhigh;
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apply_qmf(c->prev_samples + c->prev_samples_pos - 24,
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&xout1, &xout2);
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out_buf[out_len++] = av_clip_int16(xout1 >> 12);
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out_buf[out_len++] = av_clip_int16(xout2 >> 12);
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if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) {
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memmove(c->prev_samples,
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c->prev_samples + c->prev_samples_pos - 22,
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22 * sizeof(c->prev_samples[0]));
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c->prev_samples_pos = 22;
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}
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} else
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out_buf[out_len++] = rlow;
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}
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*data_size = out_len << 1;
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return avpkt->size;
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}
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AVCodec ff_adpcm_g722_decoder = {
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.name = "g722",
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.type = AVMEDIA_TYPE_AUDIO,
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.id = CODEC_ID_ADPCM_G722,
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.priv_data_size = sizeof(G722Context),
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.init = g722_init,
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.decode = g722_decode_frame,
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.long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"),
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.max_lowres = 1,
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};
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#endif
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#if CONFIG_ADPCM_G722_ENCODER
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static const int16_t low_quant[33] = {
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35, 72, 110, 150, 190, 233, 276, 323,
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370, 422, 473, 530, 587, 650, 714, 786,
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858, 940, 1023, 1121, 1219, 1339, 1458, 1612,
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1765, 1980, 2195, 2557, 2919
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};
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static inline void filter_samples(G722Context *c, const int16_t *samples,
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int *xlow, int *xhigh)
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{
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int xout1, xout2;
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c->prev_samples[c->prev_samples_pos++] = samples[0];
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c->prev_samples[c->prev_samples_pos++] = samples[1];
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apply_qmf(c->prev_samples + c->prev_samples_pos - 24, &xout1, &xout2);
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*xlow = xout1 + xout2 >> 13;
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*xhigh = xout1 - xout2 >> 13;
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if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) {
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memmove(c->prev_samples,
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c->prev_samples + c->prev_samples_pos - 22,
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22 * sizeof(c->prev_samples[0]));
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c->prev_samples_pos = 22;
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}
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}
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static inline int encode_high(const struct G722Band *state, int xhigh)
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{
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int diff = av_clip_int16(xhigh - state->s_predictor);
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int pred = 141 * state->scale_factor >> 8;
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/* = diff >= 0 ? (diff < pred) + 2 : diff >= -pred */
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return ((diff ^ (diff >> (sizeof(diff)*8-1))) < pred) + 2*(diff >= 0);
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}
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static inline int encode_low(const struct G722Band* state, int xlow)
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{
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int diff = av_clip_int16(xlow - state->s_predictor);
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/* = diff >= 0 ? diff : -(diff + 1) */
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int limit = diff ^ (diff >> (sizeof(diff)*8-1));
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int i = 0;
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limit = limit + 1 << 10;
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if (limit > low_quant[8] * state->scale_factor)
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i = 9;
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while (i < 29 && limit > low_quant[i] * state->scale_factor)
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i++;
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return (diff < 0 ? (i < 2 ? 63 : 33) : 61) - i;
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}
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static int g722_encode_trellis(AVCodecContext *avctx,
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uint8_t *dst, int buf_size, void *data)
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{
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G722Context *c = avctx->priv_data;
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const int16_t *samples = data;
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int i, j, k;
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int frontier = 1 << avctx->trellis;
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struct TrellisNode **nodes[2];
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struct TrellisNode **nodes_next[2];
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int pathn[2] = {0, 0}, froze = -1;
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struct TrellisPath *p[2];
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for (i = 0; i < 2; i++) {
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nodes[i] = c->nodep_buf[i];
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nodes_next[i] = c->nodep_buf[i] + frontier;
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memset(c->nodep_buf[i], 0, 2 * frontier * sizeof(*c->nodep_buf));
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nodes[i][0] = c->node_buf[i] + frontier;
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nodes[i][0]->ssd = 0;
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nodes[i][0]->path = 0;
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nodes[i][0]->state = c->band[i];
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}
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for (i = 0; i < buf_size >> 1; i++) {
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int xlow, xhigh;
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struct TrellisNode *next[2];
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int heap_pos[2] = {0, 0};
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for (j = 0; j < 2; j++) {
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next[j] = c->node_buf[j] + frontier*(i & 1);
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memset(nodes_next[j], 0, frontier * sizeof(**nodes_next));
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}
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filter_samples(c, &samples[2*i], &xlow, &xhigh);
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for (j = 0; j < frontier && nodes[0][j]; j++) {
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/* Only k >> 2 affects the future adaptive state, therefore testing
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* small steps that don't change k >> 2 is useless, the orignal
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* value from encode_low is better than them. Since we step k
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* in steps of 4, make sure range is a multiple of 4, so that
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* we don't miss the original value from encode_low. */
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int range = j < frontier/2 ? 4 : 0;
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struct TrellisNode *cur_node = nodes[0][j];
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int ilow = encode_low(&cur_node->state, xlow);
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for (k = ilow - range; k <= ilow + range && k <= 63; k += 4) {
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int decoded, dec_diff, pos;
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uint32_t ssd;
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struct TrellisNode* node;
|
|
|
|
if (k < 0)
|
|
continue;
|
|
|
|
decoded = av_clip((cur_node->state.scale_factor *
|
|
low_inv_quant6[k] >> 10)
|
|
+ cur_node->state.s_predictor, -16384, 16383);
|
|
dec_diff = xlow - decoded;
|
|
|
|
#define STORE_NODE(index, UPDATE, VALUE)\
|
|
ssd = cur_node->ssd + dec_diff*dec_diff;\
|
|
/* Check for wraparound. Using 64 bit ssd counters would \
|
|
* be simpler, but is slower on x86 32 bit. */\
|
|
if (ssd < cur_node->ssd)\
|
|
continue;\
|
|
if (heap_pos[index] < frontier) {\
|
|
pos = heap_pos[index]++;\
|
|
assert(pathn[index] < FREEZE_INTERVAL * frontier);\
|
|
node = nodes_next[index][pos] = next[index]++;\
|
|
node->path = pathn[index]++;\
|
|
} else {\
|
|
/* Try to replace one of the leaf nodes with the new \
|
|
* one, but not always testing the same leaf position */\
|
|
pos = (frontier>>1) + (heap_pos[index] & ((frontier>>1) - 1));\
|
|
if (ssd >= nodes_next[index][pos]->ssd)\
|
|
continue;\
|
|
heap_pos[index]++;\
|
|
node = nodes_next[index][pos];\
|
|
}\
|
|
node->ssd = ssd;\
|
|
node->state = cur_node->state;\
|
|
UPDATE;\
|
|
c->paths[index][node->path].value = VALUE;\
|
|
c->paths[index][node->path].prev = cur_node->path;\
|
|
/* Sift the newly inserted node up in the heap to restore \
|
|
* the heap property */\
|
|
while (pos > 0) {\
|
|
int parent = (pos - 1) >> 1;\
|
|
if (nodes_next[index][parent]->ssd <= ssd)\
|
|
break;\
|
|
FFSWAP(struct TrellisNode*, nodes_next[index][parent],\
|
|
nodes_next[index][pos]);\
|
|
pos = parent;\
|
|
}
|
|
STORE_NODE(0, update_low_predictor(&node->state, k >> 2), k);
|
|
}
|
|
}
|
|
|
|
for (j = 0; j < frontier && nodes[1][j]; j++) {
|
|
int ihigh;
|
|
struct TrellisNode *cur_node = nodes[1][j];
|
|
|
|
/* We don't try to get any initial guess for ihigh via
|
|
* encode_high - since there's only 4 possible values, test
|
|
* them all. Testing all of these gives a much, much larger
|
|
* gain than testing a larger range around ilow. */
|
|
for (ihigh = 0; ihigh < 4; ihigh++) {
|
|
int dhigh, decoded, dec_diff, pos;
|
|
uint32_t ssd;
|
|
struct TrellisNode* node;
|
|
|
|
dhigh = cur_node->state.scale_factor *
|
|
high_inv_quant[ihigh] >> 10;
|
|
decoded = av_clip(dhigh + cur_node->state.s_predictor,
|
|
-16384, 16383);
|
|
dec_diff = xhigh - decoded;
|
|
|
|
STORE_NODE(1, update_high_predictor(&node->state, dhigh, ihigh), ihigh);
|
|
}
|
|
}
|
|
|
|
for (j = 0; j < 2; j++) {
|
|
FFSWAP(struct TrellisNode**, nodes[j], nodes_next[j]);
|
|
|
|
if (nodes[j][0]->ssd > (1 << 16)) {
|
|
for (k = 1; k < frontier && nodes[j][k]; k++)
|
|
nodes[j][k]->ssd -= nodes[j][0]->ssd;
|
|
nodes[j][0]->ssd = 0;
|
|
}
|
|
}
|
|
|
|
if (i == froze + FREEZE_INTERVAL) {
|
|
p[0] = &c->paths[0][nodes[0][0]->path];
|
|
p[1] = &c->paths[1][nodes[1][0]->path];
|
|
for (j = i; j > froze; j--) {
|
|
dst[j] = p[1]->value << 6 | p[0]->value;
|
|
p[0] = &c->paths[0][p[0]->prev];
|
|
p[1] = &c->paths[1][p[1]->prev];
|
|
}
|
|
froze = i;
|
|
pathn[0] = pathn[1] = 0;
|
|
memset(nodes[0] + 1, 0, (frontier - 1)*sizeof(**nodes));
|
|
memset(nodes[1] + 1, 0, (frontier - 1)*sizeof(**nodes));
|
|
}
|
|
}
|
|
|
|
p[0] = &c->paths[0][nodes[0][0]->path];
|
|
p[1] = &c->paths[1][nodes[1][0]->path];
|
|
for (j = i; j > froze; j--) {
|
|
dst[j] = p[1]->value << 6 | p[0]->value;
|
|
p[0] = &c->paths[0][p[0]->prev];
|
|
p[1] = &c->paths[1][p[1]->prev];
|
|
}
|
|
c->band[0] = nodes[0][0]->state;
|
|
c->band[1] = nodes[1][0]->state;
|
|
|
|
return i;
|
|
}
|
|
|
|
static int g722_encode_frame(AVCodecContext *avctx,
|
|
uint8_t *dst, int buf_size, void *data)
|
|
{
|
|
G722Context *c = avctx->priv_data;
|
|
const int16_t *samples = data;
|
|
int i;
|
|
|
|
if (avctx->trellis)
|
|
return g722_encode_trellis(avctx, dst, buf_size, data);
|
|
|
|
for (i = 0; i < buf_size >> 1; i++) {
|
|
int xlow, xhigh, ihigh, ilow;
|
|
filter_samples(c, &samples[2*i], &xlow, &xhigh);
|
|
ihigh = encode_high(&c->band[1], xhigh);
|
|
ilow = encode_low(&c->band[0], xlow);
|
|
update_high_predictor(&c->band[1], c->band[1].scale_factor *
|
|
high_inv_quant[ihigh] >> 10, ihigh);
|
|
update_low_predictor(&c->band[0], ilow >> 2);
|
|
*dst++ = ihigh << 6 | ilow;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
AVCodec ff_adpcm_g722_encoder = {
|
|
.name = "g722",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = CODEC_ID_ADPCM_G722,
|
|
.priv_data_size = sizeof(G722Context),
|
|
.init = g722_init,
|
|
.close = g722_close,
|
|
.encode = g722_encode_frame,
|
|
.long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"),
|
|
.sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
|
|
};
|
|
#endif
|
|
|