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/* |
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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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✓✓✓✓
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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 divided 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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✓✓ |
6426 |
for (i = 0; i < width / 2; i++) |
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speech[i] += ppc_gain * *shape++; |
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✓✗✓✓
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31777 |
for (i = 1; i < ROUNDED_DIV(len, width); i++) { |
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center = very_broken_op(period, i); |
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✓✓ |
108375 |
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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✓✓✓✓
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for (j = -width / 2; j < (width + 1) / 2 && shape < shape_end; j++) |
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6076 |
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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2475 |
int isampf = tctx->avctx->sample_rate / 1000; |
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2475 |
int ibps = tctx->avctx->bit_rate / (1000 * tctx->avctx->channels); |
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2475 |
int min_period = ROUNDED_DIV(40 * 2 * mtab->size, isampf); |
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2475 |
int max_period = ROUNDED_DIV(40 * 2 * mtab->size * 6, isampf); |
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2475 |
int period_range = max_period - min_period; |
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2475 |
float pgain_step = 25000.0 / ((1 << mtab->pgain_bit) - 1); |
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|
2475 |
float ppc_gain = 1.0 / 8192 * |
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4950 |
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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2475 |
int period = min_period + |
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✓✗ |
2475 |
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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✓✗✗✓
|
2475 |
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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2475 |
width = period * mtab->peak_per2wid / (400 * mtab->size); |
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2475 |
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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2707 |
const TwinVQModeTab *mtab = tctx->mtab; |
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int i, j; |
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2707 |
float *hist = tctx->bark_hist[ftype][ch]; |
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2707 |
float val = ((const float []) { 0.4, 0.35, 0.28 })[ftype]; |
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2707 |
int bark_n_coef = mtab->fmode[ftype].bark_n_coef; |
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2707 |
int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef; |
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2707 |
int idx = 0; |
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✓✓ |
24827 |
for (i = 0; i < fw_cb_len; i++) |
223 |
✓✓ |
105880 |
for (j = 0; j < bark_n_coef; j++, idx++) { |
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83760 |
float tmp2 = mtab->fmode[ftype].bark_cb[fw_cb_len * in[j] + i] * |
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(1.0 / 4096); |
226 |
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138334 |
float st = use_hist ? (1.0 - val) * tmp2 + val * hist[idx] + 1.0 |
227 |
✓✓ |
83760 |
: tmp2 + 1.0; |
228 |
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83760 |
hist[idx] = tmp2; |
230 |
✗✓ |
83760 |
if (st < -1.0) |
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st = 1.0; |
232 |
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83760 |
twinvq_memset_float(out, st * gain, mtab->fmode[ftype].bark_tab[idx]); |
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|
83760 |
out += mtab->fmode[ftype].bark_tab[idx]; |
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} |
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2707 |
} |
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|
5063 |
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; |
242 |
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|
243 |
✓✓ |
165515 |
for (i = 0; i < tctx->n_div[ftype]; i++) { |
244 |
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160452 |
int bs_second_part = (i >= tctx->bits_main_spec_change[ftype]); |
245 |
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246 |
|
160452 |
*dst++ = get_bits(gb, tctx->bits_main_spec[0][ftype][bs_second_part]); |
247 |
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160452 |
*dst++ = get_bits(gb, tctx->bits_main_spec[1][ftype][bs_second_part]); |
248 |
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} |
249 |
|
5063 |
} |
250 |
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|
2588 |
static int twinvq_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx, |
252 |
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const uint8_t *buf, int buf_size) |
253 |
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{ |
254 |
|
2588 |
TwinVQFrameData *bits = &tctx->bits[0]; |
255 |
|
2588 |
const TwinVQModeTab *mtab = tctx->mtab; |
256 |
|
2588 |
int channels = tctx->avctx->channels; |
257 |
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int sub; |
258 |
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GetBitContext gb; |
259 |
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int i, j, k, ret; |
260 |
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|
261 |
✗✓ |
2588 |
if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0) |
262 |
|
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return ret; |
263 |
|
2588 |
skip_bits(&gb, get_bits(&gb, 8)); |
264 |
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|
265 |
|
2588 |
bits->window_type = get_bits(&gb, TWINVQ_WINDOW_TYPE_BITS); |
266 |
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|
267 |
✗✓ |
2588 |
if (bits->window_type > 8) { |
268 |
|
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av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n"); |
269 |
|
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return AVERROR_INVALIDDATA; |
270 |
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} |
271 |
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|
272 |
|
2588 |
bits->ftype = ff_twinvq_wtype_to_ftype_table[tctx->bits[0].window_type]; |
273 |
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|
274 |
|
2588 |
sub = mtab->fmode[bits->ftype].sub; |
275 |
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|
276 |
|
2588 |
read_cb_data(tctx, &gb, bits->main_coeffs, bits->ftype); |
277 |
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|
278 |
✓✓ |
5176 |
for (i = 0; i < channels; i++) |
279 |
✓✓ |
5295 |
for (j = 0; j < sub; j++) |
280 |
✓✓ |
13063 |
for (k = 0; k < mtab->fmode[bits->ftype].bark_n_coef; k++) |
281 |
|
10356 |
bits->bark1[i][j][k] = |
282 |
|
10356 |
get_bits(&gb, mtab->fmode[bits->ftype].bark_n_bit); |
283 |
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|
284 |
✓✓ |
5176 |
for (i = 0; i < channels; i++) |
285 |
✓✓ |
5295 |
for (j = 0; j < sub; j++) |
286 |
|
2707 |
bits->bark_use_hist[i][j] = get_bits1(&gb); |
287 |
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|
288 |
✓✓ |
2588 |
if (bits->ftype == TWINVQ_FT_LONG) { |
289 |
✓✓ |
4950 |
for (i = 0; i < channels; i++) |
290 |
|
2475 |
bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS); |
291 |
|
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} else { |
292 |
✓✓ |
226 |
for (i = 0; i < channels; i++) { |
293 |
|
113 |
bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS); |
294 |
✓✓ |
345 |
for (j = 0; j < sub; j++) |
295 |
|
232 |
bits->sub_gain_bits[i * sub + j] = get_bits(&gb, |
296 |
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TWINVQ_SUB_GAIN_BITS); |
297 |
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} |
298 |
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} |
299 |
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|
300 |
✓✓ |
5176 |
for (i = 0; i < channels; i++) { |
301 |
|
2588 |
bits->lpc_hist_idx[i] = get_bits(&gb, mtab->lsp_bit0); |
302 |
|
2588 |
bits->lpc_idx1[i] = get_bits(&gb, mtab->lsp_bit1); |
303 |
|
|
|
304 |
✓✓ |
10352 |
for (j = 0; j < mtab->lsp_split; j++) |
305 |
|
7764 |
bits->lpc_idx2[i][j] = get_bits(&gb, mtab->lsp_bit2); |
306 |
|
|
} |
307 |
|
|
|
308 |
✓✓ |
2588 |
if (bits->ftype == TWINVQ_FT_LONG) { |
309 |
|
2475 |
read_cb_data(tctx, &gb, bits->ppc_coeffs, 3); |
310 |
✓✓ |
4950 |
for (i = 0; i < channels; i++) { |
311 |
|
2475 |
bits->p_coef[i] = get_bits(&gb, mtab->ppc_period_bit); |
312 |
|
2475 |
bits->g_coef[i] = get_bits(&gb, mtab->pgain_bit); |
313 |
|
|
} |
314 |
|
|
} |
315 |
|
|
|
316 |
|
2588 |
return (get_bits_count(&gb) + 7) / 8; |
317 |
|
|
} |
318 |
|
|
|
319 |
|
3 |
static av_cold int twinvq_decode_init(AVCodecContext *avctx) |
320 |
|
|
{ |
321 |
|
|
int isampf, ibps; |
322 |
|
3 |
TwinVQContext *tctx = avctx->priv_data; |
323 |
|
|
|
324 |
✓✗✗✓
|
3 |
if (!avctx->extradata || avctx->extradata_size < 12) { |
325 |
|
|
av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n"); |
326 |
|
|
return AVERROR_INVALIDDATA; |
327 |
|
|
} |
328 |
|
3 |
avctx->channels = AV_RB32(avctx->extradata) + 1; |
329 |
|
3 |
avctx->bit_rate = AV_RB32(avctx->extradata + 4) * 1000; |
330 |
|
3 |
isampf = AV_RB32(avctx->extradata + 8); |
331 |
|
|
|
332 |
✓✗✗✓
|
3 |
if (isampf < 8 || isampf > 44) { |
333 |
|
|
av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate\n"); |
334 |
|
|
return AVERROR_INVALIDDATA; |
335 |
|
|
} |
336 |
✗✓✗✗
|
3 |
switch (isampf) { |
337 |
|
|
case 44: |
338 |
|
|
avctx->sample_rate = 44100; |
339 |
|
|
break; |
340 |
|
3 |
case 22: |
341 |
|
3 |
avctx->sample_rate = 22050; |
342 |
|
3 |
break; |
343 |
|
|
case 11: |
344 |
|
|
avctx->sample_rate = 11025; |
345 |
|
|
break; |
346 |
|
|
default: |
347 |
|
|
avctx->sample_rate = isampf * 1000; |
348 |
|
|
break; |
349 |
|
|
} |
350 |
|
|
|
351 |
✓✗✗✓
|
3 |
if (avctx->channels <= 0 || avctx->channels > TWINVQ_CHANNELS_MAX) { |
352 |
|
|
av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n", |
353 |
|
|
avctx->channels); |
354 |
|
|
return -1; |
355 |
|
|
} |
356 |
|
6 |
avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO |
357 |
✓✗ |
3 |
: AV_CH_LAYOUT_STEREO; |
358 |
|
|
|
359 |
|
3 |
ibps = avctx->bit_rate / (1000 * avctx->channels); |
360 |
✓✗✗✓
|
3 |
if (ibps < 8 || ibps > 48) { |
361 |
|
|
av_log(avctx, AV_LOG_ERROR, "Bad bitrate per channel value %d\n", ibps); |
362 |
|
|
return AVERROR_INVALIDDATA; |
363 |
|
|
} |
364 |
|
|
|
365 |
✗✗✗✗
✓✗✗✗
✗✗ |
3 |
switch ((isampf << 8) + ibps) { |
366 |
|
|
case (8 << 8) + 8: |
367 |
|
|
tctx->mtab = &mode_08_08; |
368 |
|
|
break; |
369 |
|
|
case (11 << 8) + 8: |
370 |
|
|
tctx->mtab = &mode_11_08; |
371 |
|
|
break; |
372 |
|
|
case (11 << 8) + 10: |
373 |
|
|
tctx->mtab = &mode_11_10; |
374 |
|
|
break; |
375 |
|
|
case (16 << 8) + 16: |
376 |
|
|
tctx->mtab = &mode_16_16; |
377 |
|
|
break; |
378 |
|
3 |
case (22 << 8) + 20: |
379 |
|
3 |
tctx->mtab = &mode_22_20; |
380 |
|
3 |
break; |
381 |
|
|
case (22 << 8) + 24: |
382 |
|
|
tctx->mtab = &mode_22_24; |
383 |
|
|
break; |
384 |
|
|
case (22 << 8) + 32: |
385 |
|
|
tctx->mtab = &mode_22_32; |
386 |
|
|
break; |
387 |
|
|
case (44 << 8) + 40: |
388 |
|
|
tctx->mtab = &mode_44_40; |
389 |
|
|
break; |
390 |
|
|
case (44 << 8) + 48: |
391 |
|
|
tctx->mtab = &mode_44_48; |
392 |
|
|
break; |
393 |
|
|
default: |
394 |
|
|
av_log(avctx, AV_LOG_ERROR, |
395 |
|
|
"This version does not support %d kHz - %d kbit/s/ch mode.\n", |
396 |
|
|
isampf, isampf); |
397 |
|
|
return -1; |
398 |
|
|
} |
399 |
|
|
|
400 |
|
3 |
tctx->codec = TWINVQ_CODEC_VQF; |
401 |
|
3 |
tctx->read_bitstream = twinvq_read_bitstream; |
402 |
|
3 |
tctx->dec_bark_env = dec_bark_env; |
403 |
|
3 |
tctx->decode_ppc = decode_ppc; |
404 |
|
3 |
tctx->frame_size = avctx->bit_rate * tctx->mtab->size |
405 |
|
3 |
/ avctx->sample_rate + 8; |
406 |
|
3 |
tctx->is_6kbps = 0; |
407 |
✓✓✗✓
|
3 |
if (avctx->block_align && avctx->block_align * 8LL / tctx->frame_size > 1) { |
408 |
|
|
av_log(avctx, AV_LOG_ERROR, |
409 |
|
|
"VQF TwinVQ should have only one frame per packet\n"); |
410 |
|
|
return AVERROR_INVALIDDATA; |
411 |
|
|
} |
412 |
|
|
|
413 |
|
3 |
return ff_twinvq_decode_init(avctx); |
414 |
|
|
} |
415 |
|
|
|
416 |
|
|
AVCodec ff_twinvq_decoder = { |
417 |
|
|
.name = "twinvq", |
418 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("VQF TwinVQ"), |
419 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
420 |
|
|
.id = AV_CODEC_ID_TWINVQ, |
421 |
|
|
.priv_data_size = sizeof(TwinVQContext), |
422 |
|
|
.init = twinvq_decode_init, |
423 |
|
|
.close = ff_twinvq_decode_close, |
424 |
|
|
.decode = ff_twinvq_decode_frame, |
425 |
|
|
.capabilities = AV_CODEC_CAP_DR1, |
426 |
|
|
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, |
427 |
|
|
AV_SAMPLE_FMT_NONE }, |
428 |
|
|
}; |