/* * Voxware MetaSound decoder * Copyright (c) 2013 Konstantin Shishkov * based on 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 <inttypes.h> #include <math.h> #include <stdint.h> #include "libavutil/channel_layout.h" #include "libavutil/float_dsp.h" #define BITSTREAM_READER_LE #include "avcodec.h" #include "fft.h" #include "get_bits.h" #include "internal.h" #include "lsp.h" #include "sinewin.h" #include "twinvq.h" #include "metasound_data.h" static void add_peak(float period, int width, const float *shape, float ppc_gain, float *speech, int len) { int i, j, center; const float *shape_end = shape + len; // 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 = (int)(i * period + 0.5); 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 = (int)(i * period + 0.5); 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 width; float ratio = (float)mtab->size / isampf; float min_period, max_period, period_range, period; float some_mult; float pgain_base, pgain_step, ppc_gain; if (tctx->avctx->channels == 1) { min_period = log2(ratio * 0.2); max_period = min_period + log2(6); } else { min_period = (int)(ratio * 0.2 * 400 + 0.5) / 400.0; max_period = (int)(ratio * 0.2 * 400 * 6 + 0.5) / 400.0; } period_range = max_period - min_period; period = min_period + period_coef * period_range / ((1 << mtab->ppc_period_bit) - 1); if (tctx->avctx->channels == 1) period = powf(2.0, period); else period = (int)(period * 400 + 0.5) / 400.0; switch (isampf) { case 8: some_mult = 2.0; break; case 11: some_mult = 3.0; break; case 16: some_mult = 3.0; break; case 22: some_mult = ibps == 32 ? 2.0 : 4.0; break; case 44: some_mult = 8.0; break; default: some_mult = 4.0; } width = (int)(some_mult / (mtab->size / period) * mtab->ppc_shape_len); if (isampf == 22 && ibps == 32) width = (int)((2.0 / period + 1) * width + 0.5); pgain_base = tctx->avctx->channels == 2 ? 25000.0 : 20000.0; pgain_step = pgain_base / ((1 << mtab->pgain_bit) - 1); ppc_gain = 1.0 / 8192 * twinvq_mulawinv(pgain_step * g_coef + pgain_step / 2, pgain_base, TWINVQ_PGAIN_MU); 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; if (tctx->avctx->channels == 1) val = 0.5; 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 / 2048); float st; if (tctx->avctx->channels == 1) st = use_hist ? tmp2 + val * hist[idx] + 1.0 : tmp2 + 1.0; else st = use_hist ? (1.0 - val) * tmp2 + val * hist[idx] + 1.0 : tmp2 + 1.0; hist[idx] = tmp2; if (st < 0.1) st = 0.1; 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 metasound_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx, const uint8_t *buf, int buf_size) { TwinVQFrameData *bits; 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; for (tctx->cur_frame = 0; tctx->cur_frame < tctx->frames_per_packet; tctx->cur_frame++) { bits = tctx->bits + tctx->cur_frame; 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[tctx->cur_frame].window_type]; sub = mtab->fmode[bits->ftype].sub; if (bits->ftype != TWINVQ_FT_SHORT && !tctx->is_6kbps) get_bits(&gb, 2); 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); } } // subframes are aligned to nibbles if (get_bits_count(&gb) & 3) skip_bits(&gb, 4 - (get_bits_count(&gb) & 3)); } return (get_bits_count(&gb) + 7) / 8; } typedef struct MetasoundProps { uint32_t tag; int bit_rate; int channels; int sample_rate; } MetasoundProps; static const MetasoundProps codec_props[] = { { MKTAG('V','X','0','3'), 6, 1, 8000 }, { MKTAG('V','X','0','4'), 12, 2, 8000 }, { MKTAG('V','O','X','i'), 8, 1, 8000 }, { MKTAG('V','O','X','j'), 10, 1, 11025 }, { MKTAG('V','O','X','k'), 16, 1, 16000 }, { MKTAG('V','O','X','L'), 24, 1, 22050 }, { MKTAG('V','O','X','q'), 32, 1, 44100 }, { MKTAG('V','O','X','r'), 40, 1, 44100 }, { MKTAG('V','O','X','s'), 48, 1, 44100 }, { MKTAG('V','O','X','t'), 16, 2, 8000 }, { MKTAG('V','O','X','u'), 20, 2, 11025 }, { MKTAG('V','O','X','v'), 32, 2, 16000 }, { MKTAG('V','O','X','w'), 48, 2, 22050 }, { MKTAG('V','O','X','x'), 64, 2, 44100 }, { MKTAG('V','O','X','y'), 80, 2, 44100 }, { MKTAG('V','O','X','z'), 96, 2, 44100 }, { 0, 0, 0, 0 } }; static av_cold int metasound_decode_init(AVCodecContext *avctx) { int isampf, ibps; TwinVQContext *tctx = avctx->priv_data; uint32_t tag; const MetasoundProps *props = codec_props; if (!avctx->extradata || avctx->extradata_size < 16) { av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n"); return AVERROR_INVALIDDATA; } tag = AV_RL32(avctx->extradata + 12); for (;;) { if (!props->tag) { av_log(avctx, AV_LOG_ERROR, "Could not find tag %08"PRIX32"\n", tag); return AVERROR_INVALIDDATA; } if (props->tag == tag) { avctx->sample_rate = props->sample_rate; avctx->channels = props->channels; avctx->bit_rate = props->bit_rate * 1000; isampf = avctx->sample_rate / 1000; break; } props++; } if (avctx->channels <= 0 || avctx->channels > TWINVQ_CHANNELS_MAX) { av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n", avctx->channels); return AVERROR_INVALIDDATA; } avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO; ibps = avctx->bit_rate / (1000 * avctx->channels); switch ((avctx->channels << 16) + (isampf << 8) + ibps) { case (1 << 16) + ( 8 << 8) + 6: tctx->mtab = &ff_metasound_mode0806; break; case (2 << 16) + ( 8 << 8) + 6: tctx->mtab = &ff_metasound_mode0806s; break; case (1 << 16) + ( 8 << 8) + 8: tctx->mtab = &ff_metasound_mode0808; break; case (2 << 16) + ( 8 << 8) + 8: tctx->mtab = &ff_metasound_mode0808s; break; case (1 << 16) + (11 << 8) + 10: tctx->mtab = &ff_metasound_mode1110; break; case (2 << 16) + (11 << 8) + 10: tctx->mtab = &ff_metasound_mode1110s; break; case (1 << 16) + (16 << 8) + 16: tctx->mtab = &ff_metasound_mode1616; break; case (2 << 16) + (16 << 8) + 16: tctx->mtab = &ff_metasound_mode1616s; break; case (1 << 16) + (22 << 8) + 24: tctx->mtab = &ff_metasound_mode2224; break; case (2 << 16) + (22 << 8) + 24: tctx->mtab = &ff_metasound_mode2224s; break; case (1 << 16) + (44 << 8) + 32: tctx->mtab = &ff_metasound_mode4432; break; case (2 << 16) + (44 << 8) + 32: tctx->mtab = &ff_metasound_mode4432s; break; case (1 << 16) + (44 << 8) + 40: tctx->mtab = &ff_metasound_mode4440; break; case (2 << 16) + (44 << 8) + 40: tctx->mtab = &ff_metasound_mode4440s; break; case (1 << 16) + (44 << 8) + 48: tctx->mtab = &ff_metasound_mode4448; break; case (2 << 16) + (44 << 8) + 48: tctx->mtab = &ff_metasound_mode4448s; break; default: av_log(avctx, AV_LOG_ERROR, "This version does not support %d kHz - %d kbit/s/ch mode.\n", isampf, ibps); return AVERROR(ENOSYS); } tctx->codec = TWINVQ_CODEC_METASOUND; tctx->read_bitstream = metasound_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; tctx->is_6kbps = ibps == 6; return ff_twinvq_decode_init(avctx); } AVCodec ff_metasound_decoder = { .name = "metasound", .long_name = NULL_IF_CONFIG_SMALL("Voxware MetaSound"), .type = AVMEDIA_TYPE_AUDIO, .id = AV_CODEC_ID_METASOUND, .priv_data_size = sizeof(TwinVQContext), .init = metasound_decode_init, .close = ff_twinvq_decode_close, .decode = ff_twinvq_decode_frame, .capabilities = AV_CODEC_CAP_DR1, .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE }, };