Voxware MetaSound decoder

1 files changed, 346 insertions, 0 deletions

diff --git a/libavcodec/metasound.c b/libavcodec/metasound.c
new file mode 100644
index 0000000000..b1245368f3
--- /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 },
+};