| /* |
| * TwinVQ decoder |
| * Copyright (c) 2009 Vitor Sessak |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; 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 divided 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, ret; |
| |
| if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0) |
| return ret; |
| 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 (get_bits_count(&gb) + 7) / 8; |
| } |
| |
| 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 * 8LL / 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 = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF, |
| .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, |
| AV_SAMPLE_FMT_NONE }, |
| }; |