forked from KolibriOS/kolibrios
423 lines
15 KiB
C
423 lines
15 KiB
C
/*
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* TwinVQ decoder
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* Copyright (c) 2009 Vitor Sessak
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include <math.h>
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#include <stdint.h>
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#include "libavutil/channel_layout.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "internal.h"
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#include "twinvq.h"
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#include "twinvq_data.h"
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static const TwinVQModeTab mode_08_08 = {
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{
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{ 8, bark_tab_s08_64, 10, tab.fcb08s, 1, 5, tab.cb0808s0, tab.cb0808s1, 18 },
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{ 2, bark_tab_m08_256, 20, tab.fcb08m, 2, 5, tab.cb0808m0, tab.cb0808m1, 16 },
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{ 1, bark_tab_l08_512, 30, tab.fcb08l, 3, 6, tab.cb0808l0, tab.cb0808l1, 17 }
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},
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512, 12, tab.lsp08, 1, 5, 3, 3, tab.shape08, 8, 28, 20, 6, 40
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};
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static const TwinVQModeTab mode_11_08 = {
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{
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{ 8, bark_tab_s11_64, 10, tab.fcb11s, 1, 5, tab.cb1108s0, tab.cb1108s1, 29 },
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{ 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1108m0, tab.cb1108m1, 24 },
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{ 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1108l0, tab.cb1108l1, 27 }
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},
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512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90
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};
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static const TwinVQModeTab mode_11_10 = {
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{
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{ 8, bark_tab_s11_64, 10, tab.fcb11s, 1, 5, tab.cb1110s0, tab.cb1110s1, 21 },
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{ 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1110m0, tab.cb1110m1, 18 },
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{ 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1110l0, tab.cb1110l1, 20 }
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},
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512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90
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};
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static const TwinVQModeTab mode_16_16 = {
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{
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{ 8, bark_tab_s16_128, 10, tab.fcb16s, 1, 5, tab.cb1616s0, tab.cb1616s1, 16 },
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{ 2, bark_tab_m16_512, 20, tab.fcb16m, 2, 5, tab.cb1616m0, tab.cb1616m1, 15 },
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{ 1, bark_tab_l16_1024, 30, tab.fcb16l, 3, 6, tab.cb1616l0, tab.cb1616l1, 16 }
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},
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1024, 16, tab.lsp16, 1, 6, 4, 3, tab.shape16, 9, 56, 60, 7, 180
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};
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static const TwinVQModeTab mode_22_20 = {
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{
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{ 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2220s0, tab.cb2220s1, 18 },
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{ 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2220m0, tab.cb2220m1, 17 },
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{ 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2220l0, tab.cb2220l1, 18 }
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},
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1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
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};
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static const TwinVQModeTab mode_22_24 = {
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{
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{ 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2224s0, tab.cb2224s1, 15 },
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{ 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2224m0, tab.cb2224m1, 14 },
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{ 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2224l0, tab.cb2224l1, 15 }
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},
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1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
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};
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static const TwinVQModeTab mode_22_32 = {
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{
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{ 4, bark_tab_s22_128, 10, tab.fcb22s_2, 1, 6, tab.cb2232s0, tab.cb2232s1, 11 },
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{ 2, bark_tab_m22_256, 20, tab.fcb22m_2, 2, 6, tab.cb2232m0, tab.cb2232m1, 11 },
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{ 1, bark_tab_l22_512, 32, tab.fcb22l_2, 4, 6, tab.cb2232l0, tab.cb2232l1, 12 }
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},
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512, 16, tab.lsp22_2, 1, 6, 4, 4, tab.shape22_2, 9, 56, 36, 7, 72
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};
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static const TwinVQModeTab mode_44_40 = {
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{
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{ 16, bark_tab_s44_128, 10, tab.fcb44s, 1, 6, tab.cb4440s0, tab.cb4440s1, 18 },
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{ 4, bark_tab_m44_512, 20, tab.fcb44m, 2, 6, tab.cb4440m0, tab.cb4440m1, 17 },
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{ 1, bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4440l0, tab.cb4440l1, 17 }
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},
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2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432
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};
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static const TwinVQModeTab mode_44_48 = {
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{
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{ 16, bark_tab_s44_128, 10, tab.fcb44s, 1, 6, tab.cb4448s0, tab.cb4448s1, 15 },
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{ 4, bark_tab_m44_512, 20, tab.fcb44m, 2, 6, tab.cb4448m0, tab.cb4448m1, 14 },
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{ 1, bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4448l0, tab.cb4448l1, 14 }
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},
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2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432
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};
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/**
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* Evaluate a * b / 400 rounded to the nearest integer. When, for example,
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* a * b == 200 and the nearest integer is ill-defined, use a table to emulate
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* the following broken float-based implementation used by the binary decoder:
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*
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* @code
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* static int very_broken_op(int a, int b)
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* {
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* static float test; // Ugh, force gcc to do the division first...
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*
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* test = a / 400.0;
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* return b * test + 0.5;
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* }
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* @endcode
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*
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* @note if this function is replaced by just ROUNDED_DIV(a * b, 400.0), the
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* stddev between the original file (before encoding with Yamaha encoder) and
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* the decoded output increases, which leads one to believe that the encoder
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* expects exactly this broken calculation.
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*/
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static int very_broken_op(int a, int b)
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{
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int x = a * b + 200;
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int size;
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const uint8_t *rtab;
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if (x % 400 || b % 5)
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return x / 400;
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x /= 400;
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size = tabs[b / 5].size;
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rtab = tabs[b / 5].tab;
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return x - rtab[size * av_log2(2 * (x - 1) / size) + (x - 1) % size];
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}
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/**
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* Sum to data a periodic peak of a given period, width and shape.
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*
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* @param period the period of the peak divised by 400.0
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*/
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static void add_peak(int period, int width, const float *shape,
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float ppc_gain, float *speech, int len)
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{
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int i, j;
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const float *shape_end = shape + len;
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int center;
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// First peak centered around zero
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for (i = 0; i < width / 2; i++)
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speech[i] += ppc_gain * *shape++;
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for (i = 1; i < ROUNDED_DIV(len, width); i++) {
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center = very_broken_op(period, i);
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for (j = -width / 2; j < (width + 1) / 2; j++)
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speech[j + center] += ppc_gain * *shape++;
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}
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// For the last block, be careful not to go beyond the end of the buffer
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center = very_broken_op(period, i);
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for (j = -width / 2; j < (width + 1) / 2 && shape < shape_end; j++)
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speech[j + center] += ppc_gain * *shape++;
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}
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static void decode_ppc(TwinVQContext *tctx, int period_coef, int g_coef,
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const float *shape, float *speech)
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{
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const TwinVQModeTab *mtab = tctx->mtab;
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int isampf = tctx->avctx->sample_rate / 1000;
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int ibps = tctx->avctx->bit_rate / (1000 * tctx->avctx->channels);
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int min_period = ROUNDED_DIV(40 * 2 * mtab->size, isampf);
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int max_period = ROUNDED_DIV(40 * 2 * mtab->size * 6, isampf);
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int period_range = max_period - min_period;
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float pgain_step = 25000.0 / ((1 << mtab->pgain_bit) - 1);
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float ppc_gain = 1.0 / 8192 *
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twinvq_mulawinv(pgain_step * g_coef +
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pgain_step / 2,
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25000.0, TWINVQ_PGAIN_MU);
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// This is actually the period multiplied by 400. It is just linearly coded
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// between its maximum and minimum value.
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int period = min_period +
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ROUNDED_DIV(period_coef * period_range,
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(1 << mtab->ppc_period_bit) - 1);
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int width;
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if (isampf == 22 && ibps == 32) {
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// For some unknown reason, NTT decided to code this case differently...
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width = ROUNDED_DIV((period + 800) * mtab->peak_per2wid,
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400 * mtab->size);
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} else
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width = period * mtab->peak_per2wid / (400 * mtab->size);
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add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len);
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}
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static void dec_bark_env(TwinVQContext *tctx, const uint8_t *in, int use_hist,
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int ch, float *out, float gain,
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enum TwinVQFrameType ftype)
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{
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const TwinVQModeTab *mtab = tctx->mtab;
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int i, j;
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float *hist = tctx->bark_hist[ftype][ch];
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float val = ((const float []) { 0.4, 0.35, 0.28 })[ftype];
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int bark_n_coef = mtab->fmode[ftype].bark_n_coef;
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int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef;
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int idx = 0;
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for (i = 0; i < fw_cb_len; i++)
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for (j = 0; j < bark_n_coef; j++, idx++) {
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float tmp2 = mtab->fmode[ftype].bark_cb[fw_cb_len * in[j] + i] *
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(1.0 / 4096);
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float st = use_hist ? (1.0 - val) * tmp2 + val * hist[idx] + 1.0
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: tmp2 + 1.0;
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hist[idx] = tmp2;
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if (st < -1.0)
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st = 1.0;
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twinvq_memset_float(out, st * gain, mtab->fmode[ftype].bark_tab[idx]);
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out += mtab->fmode[ftype].bark_tab[idx];
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}
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}
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static void read_cb_data(TwinVQContext *tctx, GetBitContext *gb,
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uint8_t *dst, enum TwinVQFrameType ftype)
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{
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int i;
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for (i = 0; i < tctx->n_div[ftype]; i++) {
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int bs_second_part = (i >= tctx->bits_main_spec_change[ftype]);
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*dst++ = get_bits(gb, tctx->bits_main_spec[0][ftype][bs_second_part]);
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*dst++ = get_bits(gb, tctx->bits_main_spec[1][ftype][bs_second_part]);
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}
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}
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static int twinvq_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx,
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const uint8_t *buf, int buf_size)
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{
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TwinVQFrameData *bits = &tctx->bits;
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const TwinVQModeTab *mtab = tctx->mtab;
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int channels = tctx->avctx->channels;
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int sub;
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GetBitContext gb;
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int i, j, k;
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init_get_bits(&gb, buf, buf_size * 8);
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skip_bits(&gb, get_bits(&gb, 8));
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bits->window_type = get_bits(&gb, TWINVQ_WINDOW_TYPE_BITS);
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if (bits->window_type > 8) {
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av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n");
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return AVERROR_INVALIDDATA;
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}
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bits->ftype = ff_twinvq_wtype_to_ftype_table[tctx->bits.window_type];
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sub = mtab->fmode[bits->ftype].sub;
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read_cb_data(tctx, &gb, bits->main_coeffs, bits->ftype);
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for (i = 0; i < channels; i++)
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for (j = 0; j < sub; j++)
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for (k = 0; k < mtab->fmode[bits->ftype].bark_n_coef; k++)
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bits->bark1[i][j][k] =
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get_bits(&gb, mtab->fmode[bits->ftype].bark_n_bit);
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for (i = 0; i < channels; i++)
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for (j = 0; j < sub; j++)
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bits->bark_use_hist[i][j] = get_bits1(&gb);
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if (bits->ftype == TWINVQ_FT_LONG) {
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for (i = 0; i < channels; i++)
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bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS);
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} else {
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for (i = 0; i < channels; i++) {
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bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS);
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for (j = 0; j < sub; j++)
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bits->sub_gain_bits[i * sub + j] = get_bits(&gb,
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TWINVQ_SUB_GAIN_BITS);
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}
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}
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for (i = 0; i < channels; i++) {
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bits->lpc_hist_idx[i] = get_bits(&gb, mtab->lsp_bit0);
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bits->lpc_idx1[i] = get_bits(&gb, mtab->lsp_bit1);
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for (j = 0; j < mtab->lsp_split; j++)
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bits->lpc_idx2[i][j] = get_bits(&gb, mtab->lsp_bit2);
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}
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if (bits->ftype == TWINVQ_FT_LONG) {
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read_cb_data(tctx, &gb, bits->ppc_coeffs, 3);
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for (i = 0; i < channels; i++) {
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bits->p_coef[i] = get_bits(&gb, mtab->ppc_period_bit);
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bits->g_coef[i] = get_bits(&gb, mtab->pgain_bit);
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}
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}
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return (get_bits_count(&gb) + 7) / 8;
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}
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static av_cold int twinvq_decode_init(AVCodecContext *avctx)
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{
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int isampf, ibps;
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TwinVQContext *tctx = avctx->priv_data;
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if (!avctx->extradata || avctx->extradata_size < 12) {
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av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n");
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return AVERROR_INVALIDDATA;
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}
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avctx->channels = AV_RB32(avctx->extradata) + 1;
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avctx->bit_rate = AV_RB32(avctx->extradata + 4) * 1000;
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isampf = AV_RB32(avctx->extradata + 8);
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if (isampf < 8 || isampf > 44) {
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av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate\n");
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return AVERROR_INVALIDDATA;
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}
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switch (isampf) {
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case 44:
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avctx->sample_rate = 44100;
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break;
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case 22:
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avctx->sample_rate = 22050;
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break;
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case 11:
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avctx->sample_rate = 11025;
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break;
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default:
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avctx->sample_rate = isampf * 1000;
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break;
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}
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if (avctx->channels <= 0 || avctx->channels > TWINVQ_CHANNELS_MAX) {
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av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n",
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avctx->channels);
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return -1;
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}
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avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO
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: AV_CH_LAYOUT_STEREO;
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ibps = avctx->bit_rate / (1000 * avctx->channels);
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if (ibps < 8 || ibps > 48) {
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av_log(avctx, AV_LOG_ERROR, "Bad bitrate per channel value %d\n", ibps);
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return AVERROR_INVALIDDATA;
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}
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switch ((isampf << 8) + ibps) {
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case (8 << 8) + 8:
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tctx->mtab = &mode_08_08;
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break;
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case (11 << 8) + 8:
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tctx->mtab = &mode_11_08;
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break;
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case (11 << 8) + 10:
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tctx->mtab = &mode_11_10;
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break;
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case (16 << 8) + 16:
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tctx->mtab = &mode_16_16;
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break;
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case (22 << 8) + 20:
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tctx->mtab = &mode_22_20;
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break;
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case (22 << 8) + 24:
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tctx->mtab = &mode_22_24;
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break;
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case (22 << 8) + 32:
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tctx->mtab = &mode_22_32;
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break;
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case (44 << 8) + 40:
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tctx->mtab = &mode_44_40;
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break;
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case (44 << 8) + 48:
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tctx->mtab = &mode_44_48;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR,
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"This version does not support %d kHz - %d kbit/s/ch mode.\n",
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isampf, isampf);
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return -1;
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}
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avctx->block_align = (avctx->bit_rate * tctx->mtab->size
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/ avctx->sample_rate + 15) / 8;
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tctx->codec = TWINVQ_CODEC_VQF;
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tctx->read_bitstream = twinvq_read_bitstream;
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tctx->dec_bark_env = dec_bark_env;
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tctx->decode_ppc = decode_ppc;
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return ff_twinvq_decode_init(avctx);
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}
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AVCodec ff_twinvq_decoder = {
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.name = "twinvq",
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.long_name = NULL_IF_CONFIG_SMALL("VQF TwinVQ"),
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_TWINVQ,
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.priv_data_size = sizeof(TwinVQContext),
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.init = twinvq_decode_init,
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.close = ff_twinvq_decode_close,
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.decode = ff_twinvq_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
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AV_SAMPLE_FMT_NONE },
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};
|