390 lines
13 KiB
C
390 lines
13 KiB
C
/*
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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 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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#include <inttypes.h>
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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;
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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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for (tctx->cur_frame = 0; tctx->cur_frame < tctx->frames_per_packet;
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tctx->cur_frame++) {
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bits = tctx->bits + tctx->cur_frame;
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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[tctx->cur_frame].window_type];
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sub = mtab->fmode[bits->ftype].sub;
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if (bits->ftype != TWINVQ_FT_SHORT && !tctx->is_6kbps)
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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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// subframes are aligned to nibbles
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if (get_bits_count(&gb) & 3)
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skip_bits(&gb, 4 - (get_bits_count(&gb) & 3));
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}
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return 0;
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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 %08"PRIX32"\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) + 6:
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tctx->mtab = &ff_metasound_mode0806;
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break;
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case (2 << 16) + ( 8 << 8) + 6:
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tctx->mtab = &ff_metasound_mode0806s;
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break;
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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 (2 << 16) + ( 8 << 8) + 8:
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tctx->mtab = &ff_metasound_mode0808s;
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break;
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case (1 << 16) + (11 << 8) + 10:
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tctx->mtab = &ff_metasound_mode1110;
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break;
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case (2 << 16) + (11 << 8) + 10:
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tctx->mtab = &ff_metasound_mode1110s;
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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 (2 << 16) + (16 << 8) + 16:
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tctx->mtab = &ff_metasound_mode1616s;
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break;
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case (1 << 16) + (22 << 8) + 24:
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tctx->mtab = &ff_metasound_mode2224;
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break;
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case (2 << 16) + (22 << 8) + 24:
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tctx->mtab = &ff_metasound_mode2224s;
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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) + 32:
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tctx->mtab = &ff_metasound_mode4432s;
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break;
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case (1 << 16) + (44 << 8) + 40:
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tctx->mtab = &ff_metasound_mode4440;
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break;
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case (2 << 16) + (44 << 8) + 40:
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tctx->mtab = &ff_metasound_mode4440s;
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break;
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case (1 << 16) + (44 << 8) + 48:
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tctx->mtab = &ff_metasound_mode4448;
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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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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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tctx->frame_size = avctx->bit_rate * tctx->mtab->size
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/ avctx->sample_rate;
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tctx->is_6kbps = ibps == 6;
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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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