diff options
Diffstat (limited to 'libavcodec/metasound.c')
-rw-r--r-- | libavcodec/metasound.c | 346 |
1 files changed, 346 insertions, 0 deletions
diff --git a/libavcodec/metasound.c b/libavcodec/metasound.c new file mode 100644 index 0000000..b124536 --- /dev/null +++ b/libavcodec/metasound.c @@ -0,0 +1,346 @@ +/* + * Voxware MetaSound decoder + * Copyright (c) 2013 Konstantin Shishkov + * based on 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> + +#define BITSTREAM_READER_LE +#include "libavutil/channel_layout.h" +#include "libavutil/float_dsp.h" +#include "avcodec.h" +#include "get_bits.h" +#include "fft.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 = &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) { + 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); + + 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; + + if (bits->ftype != TWINVQ_FT_SHORT) + 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); + } + } + + return 0; +} + +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 %08X\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) + 8: + tctx->mtab = &ff_metasound_mode0808; + break; + case (1 << 16) + (16 << 8) + 16: + tctx->mtab = &ff_metasound_mode1616; + break; + case (1 << 16) + (44 << 8) + 32: + tctx->mtab = &ff_metasound_mode4432; + 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, isampf); + 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; + + 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 = CODEC_CAP_DR1, + .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, + AV_SAMPLE_FMT_NONE }, +}; |