From 86f4c59bd676672040b89d8fea4c9e3b59bfe7ab Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Sun, 4 Aug 2013 17:18:34 +0200 Subject: twinvq: Split VQF-specific part from common TwinVQ decoder core Signed-off-by: Diego Biurrun --- libavcodec/twinvqdec.c | 421 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 421 insertions(+) create mode 100644 libavcodec/twinvqdec.c (limited to 'libavcodec/twinvqdec.c') diff --git a/libavcodec/twinvqdec.c b/libavcodec/twinvqdec.c new file mode 100644 index 0000000000..259a9d68fd --- /dev/null +++ b/libavcodec/twinvqdec.c @@ -0,0 +1,421 @@ +/* + * 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 +#include + +#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; + const TwinVQModeTab *mtab = tctx->mtab; + int channels = tctx->avctx->channels; + int sub; + GetBitContext gb; + int i, j, k; + + if (buf_size * 8 < avctx->bit_rate * mtab->size / avctx->sample_rate + 8) { + av_log(avctx, AV_LOG_ERROR, + "Frame too small (%d bytes). Truncated file?\n", buf_size); + return AVERROR(EINVAL); + } + + 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.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); + + 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; + + return ff_twinvq_decode_init(avctx); +} + +AVCodec ff_twinvq_decoder = { + .name = "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, + .long_name = NULL_IF_CONFIG_SMALL("VQF TwinVQ"), + .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, + AV_SAMPLE_FMT_NONE }, +}; -- cgit v1.2.3