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343 lines
12 KiB
343 lines
12 KiB
/* |
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* Voxware MetaSound decoder |
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* Copyright (c) 2013 Konstantin Shishkov |
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* based on 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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#define BITSTREAM_READER_LE |
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#include "libavutil/channel_layout.h" |
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#include "libavutil/float_dsp.h" |
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#include "avcodec.h" |
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#include "get_bits.h" |
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#include "fft.h" |
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#include "internal.h" |
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#include "lsp.h" |
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#include "sinewin.h" |
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#include "twinvq.h" |
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#include "metasound_data.h" |
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static void add_peak(float 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, center; |
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const float *shape_end = shape + len; |
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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 = (int)(i * period + 0.5); |
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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 = (int)(i * period + 0.5); |
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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 width; |
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float ratio = (float)mtab->size / isampf; |
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float min_period, max_period, period_range, period; |
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float some_mult; |
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float pgain_base, pgain_step, ppc_gain; |
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if (tctx->avctx->channels == 1) { |
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min_period = log2(ratio * 0.2); |
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max_period = min_period + log2(6); |
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} else { |
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min_period = (int)(ratio * 0.2 * 400 + 0.5) / 400.0; |
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max_period = (int)(ratio * 0.2 * 400 * 6 + 0.5) / 400.0; |
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} |
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period_range = max_period - min_period; |
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period = min_period + period_coef * period_range / |
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((1 << mtab->ppc_period_bit) - 1); |
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if (tctx->avctx->channels == 1) |
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period = powf(2.0, period); |
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else |
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period = (int)(period * 400 + 0.5) / 400.0; |
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switch (isampf) { |
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case 8: some_mult = 2.0; break; |
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case 11: some_mult = 3.0; break; |
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case 16: some_mult = 3.0; break; |
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case 22: some_mult = ibps == 32 ? 2.0 : 4.0; break; |
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case 44: some_mult = 8.0; break; |
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default: some_mult = 4.0; |
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} |
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width = (int)(some_mult / (mtab->size / period) * mtab->ppc_shape_len); |
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if (isampf == 22 && ibps == 32) |
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width = (int)((2.0 / period + 1) * width + 0.5); |
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pgain_base = tctx->avctx->channels == 2 ? 25000.0 : 20000.0; |
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pgain_step = pgain_base / ((1 << mtab->pgain_bit) - 1); |
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ppc_gain = 1.0 / 8192 * |
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twinvq_mulawinv(pgain_step * g_coef + pgain_step / 2, |
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pgain_base, TWINVQ_PGAIN_MU); |
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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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if (tctx->avctx->channels == 1) |
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val = 0.5; |
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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 / 2048); |
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float st; |
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if (tctx->avctx->channels == 1) |
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st = use_hist ? |
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tmp2 + val * hist[idx] + 1.0 : tmp2 + 1.0; |
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else |
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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 < 0.1) |
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st = 0.1; |
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twinvq_memset_float(out, st * gain, |
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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 metasound_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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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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if (bits->ftype != TWINVQ_FT_SHORT) |
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get_bits(&gb, 2); |
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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] = |
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get_bits(&gb, 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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typedef struct MetasoundProps { |
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uint32_t tag; |
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int bit_rate; |
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int channels; |
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int sample_rate; |
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} MetasoundProps; |
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static const MetasoundProps codec_props[] = { |
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{ MKTAG('V','X','0','3'), 6, 1, 8000 }, |
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{ MKTAG('V','X','0','4'), 12, 2, 8000 }, |
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{ MKTAG('V','O','X','i'), 8, 1, 8000 }, |
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{ MKTAG('V','O','X','j'), 10, 1, 11025 }, |
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{ MKTAG('V','O','X','k'), 16, 1, 16000 }, |
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{ MKTAG('V','O','X','L'), 24, 1, 22050 }, |
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{ MKTAG('V','O','X','q'), 32, 1, 44100 }, |
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{ MKTAG('V','O','X','r'), 40, 1, 44100 }, |
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{ MKTAG('V','O','X','s'), 48, 1, 44100 }, |
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{ MKTAG('V','O','X','t'), 16, 2, 8000 }, |
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{ MKTAG('V','O','X','u'), 20, 2, 11025 }, |
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{ MKTAG('V','O','X','v'), 32, 2, 16000 }, |
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{ MKTAG('V','O','X','w'), 48, 2, 22050 }, |
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{ MKTAG('V','O','X','x'), 64, 2, 44100 }, |
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{ MKTAG('V','O','X','y'), 80, 2, 44100 }, |
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{ MKTAG('V','O','X','z'), 96, 2, 44100 }, |
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{ 0, 0, 0, 0 } |
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}; |
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static av_cold int metasound_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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uint32_t tag; |
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const MetasoundProps *props = codec_props; |
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if (!avctx->extradata || avctx->extradata_size < 16) { |
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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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tag = AV_RL32(avctx->extradata + 12); |
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for (;;) { |
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if (!props->tag) { |
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av_log(avctx, AV_LOG_ERROR, "Could not find tag %08X\n", tag); |
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return AVERROR_INVALIDDATA; |
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} |
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if (props->tag == tag) { |
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avctx->sample_rate = props->sample_rate; |
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avctx->channels = props->channels; |
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avctx->bit_rate = props->bit_rate * 1000; |
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isampf = avctx->sample_rate / 1000; |
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break; |
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} |
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props++; |
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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 AVERROR_INVALIDDATA; |
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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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switch ((avctx->channels << 16) + (isampf << 8) + ibps) { |
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case (1 << 16) + ( 8 << 8) + 8: |
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tctx->mtab = &ff_metasound_mode0808; |
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break; |
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case (1 << 16) + (16 << 8) + 16: |
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tctx->mtab = &ff_metasound_mode1616; |
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break; |
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case (1 << 16) + (44 << 8) + 32: |
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tctx->mtab = &ff_metasound_mode4432; |
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break; |
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case (2 << 16) + (44 << 8) + 48: |
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tctx->mtab = &ff_metasound_mode4448s; |
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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, ibps); |
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return AVERROR(ENOSYS); |
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} |
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avctx->block_align = (avctx->bit_rate * tctx->mtab->size |
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/ avctx->sample_rate + 7) / 8; |
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tctx->codec = TWINVQ_CODEC_METASOUND; |
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tctx->read_bitstream = metasound_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_metasound_decoder = { |
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.name = "metasound", |
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.long_name = NULL_IF_CONFIG_SMALL("Voxware MetaSound"), |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_METASOUND, |
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.priv_data_size = sizeof(TwinVQContext), |
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.init = metasound_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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};
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