/* * TwinVQ decoder * Copyright (c) 2009 Vitor Sessak * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <math.h> #include <stdint.h> #include "libavutil/channel_layout.h" #include "avcodec.h" #include "get_bits.h" #include "internal.h" #include "twinvq.h" #include "twinvq_data.h" static const TwinVQModeTab mode_08_08 = { { { 8, bark_tab_s08_64, 10, tab.fcb08s, 1, 5, tab.cb0808s0, tab.cb0808s1, 18 }, { 2, bark_tab_m08_256, 20, tab.fcb08m, 2, 5, tab.cb0808m0, tab.cb0808m1, 16 }, { 1, bark_tab_l08_512, 30, tab.fcb08l, 3, 6, tab.cb0808l0, tab.cb0808l1, 17 } }, 512, 12, tab.lsp08, 1, 5, 3, 3, tab.shape08, 8, 28, 20, 6, 40 }; static const TwinVQModeTab mode_11_08 = { { { 8, bark_tab_s11_64, 10, tab.fcb11s, 1, 5, tab.cb1108s0, tab.cb1108s1, 29 }, { 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1108m0, tab.cb1108m1, 24 }, { 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1108l0, tab.cb1108l1, 27 } }, 512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90 }; static const TwinVQModeTab mode_11_10 = { { { 8, bark_tab_s11_64, 10, tab.fcb11s, 1, 5, tab.cb1110s0, tab.cb1110s1, 21 }, { 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1110m0, tab.cb1110m1, 18 }, { 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1110l0, tab.cb1110l1, 20 } }, 512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90 }; static const TwinVQModeTab mode_16_16 = { { { 8, bark_tab_s16_128, 10, tab.fcb16s, 1, 5, tab.cb1616s0, tab.cb1616s1, 16 }, { 2, bark_tab_m16_512, 20, tab.fcb16m, 2, 5, tab.cb1616m0, tab.cb1616m1, 15 }, { 1, bark_tab_l16_1024, 30, tab.fcb16l, 3, 6, tab.cb1616l0, tab.cb1616l1, 16 } }, 1024, 16, tab.lsp16, 1, 6, 4, 3, tab.shape16, 9, 56, 60, 7, 180 }; static const TwinVQModeTab mode_22_20 = { { { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2220s0, tab.cb2220s1, 18 }, { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2220m0, tab.cb2220m1, 17 }, { 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2220l0, tab.cb2220l1, 18 } }, 1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144 }; static const TwinVQModeTab mode_22_24 = { { { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2224s0, tab.cb2224s1, 15 }, { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2224m0, tab.cb2224m1, 14 }, { 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2224l0, tab.cb2224l1, 15 } }, 1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144 }; static const TwinVQModeTab mode_22_32 = { { { 4, bark_tab_s22_128, 10, tab.fcb22s_2, 1, 6, tab.cb2232s0, tab.cb2232s1, 11 }, { 2, bark_tab_m22_256, 20, tab.fcb22m_2, 2, 6, tab.cb2232m0, tab.cb2232m1, 11 }, { 1, bark_tab_l22_512, 32, tab.fcb22l_2, 4, 6, tab.cb2232l0, tab.cb2232l1, 12 } }, 512, 16, tab.lsp22_2, 1, 6, 4, 4, tab.shape22_2, 9, 56, 36, 7, 72 }; static const TwinVQModeTab mode_44_40 = { { { 16, bark_tab_s44_128, 10, tab.fcb44s, 1, 6, tab.cb4440s0, tab.cb4440s1, 18 }, { 4, bark_tab_m44_512, 20, tab.fcb44m, 2, 6, tab.cb4440m0, tab.cb4440m1, 17 }, { 1, bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4440l0, tab.cb4440l1, 17 } }, 2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432 }; static const TwinVQModeTab mode_44_48 = { { { 16, bark_tab_s44_128, 10, tab.fcb44s, 1, 6, tab.cb4448s0, tab.cb4448s1, 15 }, { 4, bark_tab_m44_512, 20, tab.fcb44m, 2, 6, tab.cb4448m0, tab.cb4448m1, 14 }, { 1, bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4448l0, tab.cb4448l1, 14 } }, 2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432 }; /** * Evaluate a * b / 400 rounded to the nearest integer. When, for example, * a * b == 200 and the nearest integer is ill-defined, use a table to emulate * the following broken float-based implementation used by the binary decoder: * * @code * static int very_broken_op(int a, int b) * { * static float test; // Ugh, force gcc to do the division first... * * test = a / 400.0; * return b * test + 0.5; * } * @endcode * * @note if this function is replaced by just ROUNDED_DIV(a * b, 400.0), the * stddev between the original file (before encoding with Yamaha encoder) and * the decoded output increases, which leads one to believe that the encoder * expects exactly this broken calculation. */ static int very_broken_op(int a, int b) { int x = a * b + 200; int size; const uint8_t *rtab; if (x % 400 || b % 5) return x / 400; x /= 400; size = tabs[b / 5].size; rtab = tabs[b / 5].tab; return x - rtab[size * av_log2(2 * (x - 1) / size) + (x - 1) % size]; } /** * Sum to data a periodic peak of a given period, width and shape. * * @param period the period of the peak divised by 400.0 */ static void add_peak(int period, int width, const float *shape, float ppc_gain, float *speech, int len) { int i, j; const float *shape_end = shape + len; int center; // First peak centered around zero for (i = 0; i < width / 2; i++) speech[i] += ppc_gain * *shape++; for (i = 1; i < ROUNDED_DIV(len, width); i++) { center = very_broken_op(period, i); for (j = -width / 2; j < (width + 1) / 2; j++) speech[j + center] += ppc_gain * *shape++; } // For the last block, be careful not to go beyond the end of the buffer center = very_broken_op(period, i); for (j = -width / 2; j < (width + 1) / 2 && shape < shape_end; j++) speech[j + center] += ppc_gain * *shape++; } static void decode_ppc(TwinVQContext *tctx, int period_coef, int g_coef, const float *shape, float *speech) { const TwinVQModeTab *mtab = tctx->mtab; int isampf = tctx->avctx->sample_rate / 1000; int ibps = tctx->avctx->bit_rate / (1000 * tctx->avctx->channels); int min_period = ROUNDED_DIV(40 * 2 * mtab->size, isampf); int max_period = ROUNDED_DIV(40 * 2 * mtab->size * 6, isampf); int period_range = max_period - min_period; float pgain_step = 25000.0 / ((1 << mtab->pgain_bit) - 1); float ppc_gain = 1.0 / 8192 * twinvq_mulawinv(pgain_step * g_coef + pgain_step / 2, 25000.0, TWINVQ_PGAIN_MU); // This is actually the period multiplied by 400. It is just linearly coded // between its maximum and minimum value. int period = min_period + ROUNDED_DIV(period_coef * period_range, (1 << mtab->ppc_period_bit) - 1); int width; if (isampf == 22 && ibps == 32) { // For some unknown reason, NTT decided to code this case differently... width = ROUNDED_DIV((period + 800) * mtab->peak_per2wid, 400 * mtab->size); } else width = period * mtab->peak_per2wid / (400 * mtab->size); add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len); } static void dec_bark_env(TwinVQContext *tctx, const uint8_t *in, int use_hist, int ch, float *out, float gain, enum TwinVQFrameType ftype) { const TwinVQModeTab *mtab = tctx->mtab; int i, j; float *hist = tctx->bark_hist[ftype][ch]; float val = ((const float []) { 0.4, 0.35, 0.28 })[ftype]; int bark_n_coef = mtab->fmode[ftype].bark_n_coef; int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef; int idx = 0; for (i = 0; i < fw_cb_len; i++) for (j = 0; j < bark_n_coef; j++, idx++) { float tmp2 = mtab->fmode[ftype].bark_cb[fw_cb_len * in[j] + i] * (1.0 / 4096); float st = use_hist ? (1.0 - val) * tmp2 + val * hist[idx] + 1.0 : tmp2 + 1.0; hist[idx] = tmp2; if (st < -1.0) st = 1.0; twinvq_memset_float(out, st * gain, mtab->fmode[ftype].bark_tab[idx]); out += mtab->fmode[ftype].bark_tab[idx]; } } static void read_cb_data(TwinVQContext *tctx, GetBitContext *gb, uint8_t *dst, enum TwinVQFrameType ftype) { int i; for (i = 0; i < tctx->n_div[ftype]; i++) { int bs_second_part = (i >= tctx->bits_main_spec_change[ftype]); *dst++ = get_bits(gb, tctx->bits_main_spec[0][ftype][bs_second_part]); *dst++ = get_bits(gb, tctx->bits_main_spec[1][ftype][bs_second_part]); } } static int twinvq_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx, const uint8_t *buf, int buf_size) { TwinVQFrameData *bits = &tctx->bits[0]; const TwinVQModeTab *mtab = tctx->mtab; int channels = tctx->avctx->channels; int sub; GetBitContext gb; int i, j, k; init_get_bits(&gb, buf, buf_size * 8); skip_bits(&gb, get_bits(&gb, 8)); bits->window_type = get_bits(&gb, TWINVQ_WINDOW_TYPE_BITS); if (bits->window_type > 8) { av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n"); return AVERROR_INVALIDDATA; } bits->ftype = ff_twinvq_wtype_to_ftype_table[tctx->bits[0].window_type]; sub = mtab->fmode[bits->ftype].sub; read_cb_data(tctx, &gb, bits->main_coeffs, bits->ftype); for (i = 0; i < channels; i++) for (j = 0; j < sub; j++) for (k = 0; k < mtab->fmode[bits->ftype].bark_n_coef; k++) bits->bark1[i][j][k] = get_bits(&gb, mtab->fmode[bits->ftype].bark_n_bit); for (i = 0; i < channels; i++) for (j = 0; j < sub; j++) bits->bark_use_hist[i][j] = get_bits1(&gb); if (bits->ftype == TWINVQ_FT_LONG) { for (i = 0; i < channels; i++) bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS); } else { for (i = 0; i < channels; i++) { bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS); for (j = 0; j < sub; j++) bits->sub_gain_bits[i * sub + j] = get_bits(&gb, TWINVQ_SUB_GAIN_BITS); } } for (i = 0; i < channels; i++) { bits->lpc_hist_idx[i] = get_bits(&gb, mtab->lsp_bit0); bits->lpc_idx1[i] = get_bits(&gb, mtab->lsp_bit1); for (j = 0; j < mtab->lsp_split; j++) bits->lpc_idx2[i][j] = get_bits(&gb, mtab->lsp_bit2); } if (bits->ftype == TWINVQ_FT_LONG) { read_cb_data(tctx, &gb, bits->ppc_coeffs, 3); for (i = 0; i < channels; i++) { bits->p_coef[i] = get_bits(&gb, mtab->ppc_period_bit); bits->g_coef[i] = get_bits(&gb, mtab->pgain_bit); } } return 0; } static av_cold int twinvq_decode_init(AVCodecContext *avctx) { int isampf, ibps; TwinVQContext *tctx = avctx->priv_data; if (!avctx->extradata || avctx->extradata_size < 12) { av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n"); return AVERROR_INVALIDDATA; } avctx->channels = AV_RB32(avctx->extradata) + 1; avctx->bit_rate = AV_RB32(avctx->extradata + 4) * 1000; isampf = AV_RB32(avctx->extradata + 8); if (isampf < 8 || isampf > 44) { av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate\n"); return AVERROR_INVALIDDATA; } switch (isampf) { case 44: avctx->sample_rate = 44100; break; case 22: avctx->sample_rate = 22050; break; case 11: avctx->sample_rate = 11025; break; default: avctx->sample_rate = isampf * 1000; break; } if (avctx->channels <= 0 || avctx->channels > TWINVQ_CHANNELS_MAX) { av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n", avctx->channels); return -1; } avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO; ibps = avctx->bit_rate / (1000 * avctx->channels); if (ibps < 8 || ibps > 48) { av_log(avctx, AV_LOG_ERROR, "Bad bitrate per channel value %d\n", ibps); return AVERROR_INVALIDDATA; } switch ((isampf << 8) + ibps) { case (8 << 8) + 8: tctx->mtab = &mode_08_08; break; case (11 << 8) + 8: tctx->mtab = &mode_11_08; break; case (11 << 8) + 10: tctx->mtab = &mode_11_10; break; case (16 << 8) + 16: tctx->mtab = &mode_16_16; break; case (22 << 8) + 20: tctx->mtab = &mode_22_20; break; case (22 << 8) + 24: tctx->mtab = &mode_22_24; break; case (22 << 8) + 32: tctx->mtab = &mode_22_32; break; case (44 << 8) + 40: tctx->mtab = &mode_44_40; break; case (44 << 8) + 48: tctx->mtab = &mode_44_48; break; default: av_log(avctx, AV_LOG_ERROR, "This version does not support %d kHz - %d kbit/s/ch mode.\n", isampf, isampf); return -1; } tctx->codec = TWINVQ_CODEC_VQF; tctx->read_bitstream = twinvq_read_bitstream; tctx->dec_bark_env = dec_bark_env; tctx->decode_ppc = decode_ppc; tctx->frame_size = avctx->bit_rate * tctx->mtab->size / avctx->sample_rate + 8; tctx->is_6kbps = 0; if (avctx->block_align && avctx->block_align * 8 / tctx->frame_size > 1) { av_log(avctx, AV_LOG_ERROR, "VQF TwinVQ should have only one frame per packet\n"); return AVERROR_INVALIDDATA; } return ff_twinvq_decode_init(avctx); } AVCodec ff_twinvq_decoder = { .name = "twinvq", .long_name = NULL_IF_CONFIG_SMALL("VQF TwinVQ"), .type = AVMEDIA_TYPE_AUDIO, .id = AV_CODEC_ID_TWINVQ, .priv_data_size = sizeof(TwinVQContext), .init = twinvq_decode_init, .close = ff_twinvq_decode_close, .decode = ff_twinvq_decode_frame, .capabilities = CODEC_CAP_DR1, .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE }, };