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  1. /*
  2.  * DSP Group TrueSpeech compatible decoder
  3.  * Copyright (c) 2005 Konstantin Shishkov
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "libavutil/channel_layout.h"
  23. #include "libavutil/intreadwrite.h"
  24. #include "avcodec.h"
  25. #include "dsputil.h"
  26. #include "get_bits.h"
  27. #include "internal.h"
  28.  
  29. #include "truespeech_data.h"
  30. /**
  31.  * @file
  32.  * TrueSpeech decoder.
  33.  */
  34.  
  35. /**
  36.  * TrueSpeech decoder context
  37.  */
  38. typedef struct {
  39.     DSPContext dsp;
  40.     /* input data */
  41.     DECLARE_ALIGNED(16, uint8_t, buffer)[32];
  42.     int16_t vector[8];  ///< input vector: 5/5/4/4/4/3/3/3
  43.     int offset1[2];     ///< 8-bit value, used in one copying offset
  44.     int offset2[4];     ///< 7-bit value, encodes offsets for copying and for two-point filter
  45.     int pulseoff[4];    ///< 4-bit offset of pulse values block
  46.     int pulsepos[4];    ///< 27-bit variable, encodes 7 pulse positions
  47.     int pulseval[4];    ///< 7x2-bit pulse values
  48.     int flag;           ///< 1-bit flag, shows how to choose filters
  49.     /* temporary data */
  50.     int filtbuf[146];   // some big vector used for storing filters
  51.     int prevfilt[8];    // filter from previous frame
  52.     int16_t tmp1[8];    // coefficients for adding to out
  53.     int16_t tmp2[8];    // coefficients for adding to out
  54.     int16_t tmp3[8];    // coefficients for adding to out
  55.     int16_t cvector[8]; // correlated input vector
  56.     int filtval;        // gain value for one function
  57.     int16_t newvec[60]; // tmp vector
  58.     int16_t filters[32]; // filters for every subframe
  59. } TSContext;
  60.  
  61. static av_cold int truespeech_decode_init(AVCodecContext * avctx)
  62. {
  63.     TSContext *c = avctx->priv_data;
  64.  
  65.     if (avctx->channels != 1) {
  66.         avpriv_request_sample(avctx, "Channel count %d", avctx->channels);
  67.         return AVERROR_PATCHWELCOME;
  68.     }
  69.  
  70.     avctx->channel_layout = AV_CH_LAYOUT_MONO;
  71.     avctx->sample_fmt     = AV_SAMPLE_FMT_S16;
  72.  
  73.     ff_dsputil_init(&c->dsp, avctx);
  74.  
  75.     return 0;
  76. }
  77.  
  78. static void truespeech_read_frame(TSContext *dec, const uint8_t *input)
  79. {
  80.     GetBitContext gb;
  81.  
  82.     dec->dsp.bswap_buf((uint32_t *)dec->buffer, (const uint32_t *)input, 8);
  83.     init_get_bits(&gb, dec->buffer, 32 * 8);
  84.  
  85.     dec->vector[7] = ts_codebook[7][get_bits(&gb, 3)];
  86.     dec->vector[6] = ts_codebook[6][get_bits(&gb, 3)];
  87.     dec->vector[5] = ts_codebook[5][get_bits(&gb, 3)];
  88.     dec->vector[4] = ts_codebook[4][get_bits(&gb, 4)];
  89.     dec->vector[3] = ts_codebook[3][get_bits(&gb, 4)];
  90.     dec->vector[2] = ts_codebook[2][get_bits(&gb, 4)];
  91.     dec->vector[1] = ts_codebook[1][get_bits(&gb, 5)];
  92.     dec->vector[0] = ts_codebook[0][get_bits(&gb, 5)];
  93.     dec->flag      = get_bits1(&gb);
  94.  
  95.     dec->offset1[0] = get_bits(&gb, 4) << 4;
  96.     dec->offset2[3] = get_bits(&gb, 7);
  97.     dec->offset2[2] = get_bits(&gb, 7);
  98.     dec->offset2[1] = get_bits(&gb, 7);
  99.     dec->offset2[0] = get_bits(&gb, 7);
  100.  
  101.     dec->offset1[1]  = get_bits(&gb, 4);
  102.     dec->pulseval[1] = get_bits(&gb, 14);
  103.     dec->pulseval[0] = get_bits(&gb, 14);
  104.  
  105.     dec->offset1[1] |= get_bits(&gb, 4) << 4;
  106.     dec->pulseval[3] = get_bits(&gb, 14);
  107.     dec->pulseval[2] = get_bits(&gb, 14);
  108.  
  109.     dec->offset1[0] |= get_bits1(&gb);
  110.     dec->pulsepos[0] = get_bits_long(&gb, 27);
  111.     dec->pulseoff[0] = get_bits(&gb, 4);
  112.  
  113.     dec->offset1[0] |= get_bits1(&gb) << 1;
  114.     dec->pulsepos[1] = get_bits_long(&gb, 27);
  115.     dec->pulseoff[1] = get_bits(&gb, 4);
  116.  
  117.     dec->offset1[0] |= get_bits1(&gb) << 2;
  118.     dec->pulsepos[2] = get_bits_long(&gb, 27);
  119.     dec->pulseoff[2] = get_bits(&gb, 4);
  120.  
  121.     dec->offset1[0] |= get_bits1(&gb) << 3;
  122.     dec->pulsepos[3] = get_bits_long(&gb, 27);
  123.     dec->pulseoff[3] = get_bits(&gb, 4);
  124. }
  125.  
  126. static void truespeech_correlate_filter(TSContext *dec)
  127. {
  128.     int16_t tmp[8];
  129.     int i, j;
  130.  
  131.     for(i = 0; i < 8; i++){
  132.         if(i > 0){
  133.             memcpy(tmp, dec->cvector, i * sizeof(*tmp));
  134.             for(j = 0; j < i; j++)
  135.                 dec->cvector[j] = ((tmp[i - j - 1] * dec->vector[i]) +
  136.                                    (dec->cvector[j] << 15) + 0x4000) >> 15;
  137.         }
  138.         dec->cvector[i] = (8 - dec->vector[i]) >> 3;
  139.     }
  140.     for(i = 0; i < 8; i++)
  141.         dec->cvector[i] = (dec->cvector[i] * ts_decay_994_1000[i]) >> 15;
  142.  
  143.     dec->filtval = dec->vector[0];
  144. }
  145.  
  146. static void truespeech_filters_merge(TSContext *dec)
  147. {
  148.     int i;
  149.  
  150.     if(!dec->flag){
  151.         for(i = 0; i < 8; i++){
  152.             dec->filters[i + 0] = dec->prevfilt[i];
  153.             dec->filters[i + 8] = dec->prevfilt[i];
  154.         }
  155.     }else{
  156.         for(i = 0; i < 8; i++){
  157.             dec->filters[i + 0]=(dec->cvector[i] * 21846 + dec->prevfilt[i] * 10923 + 16384) >> 15;
  158.             dec->filters[i + 8]=(dec->cvector[i] * 10923 + dec->prevfilt[i] * 21846 + 16384) >> 15;
  159.         }
  160.     }
  161.     for(i = 0; i < 8; i++){
  162.         dec->filters[i + 16] = dec->cvector[i];
  163.         dec->filters[i + 24] = dec->cvector[i];
  164.     }
  165. }
  166.  
  167. static void truespeech_apply_twopoint_filter(TSContext *dec, int quart)
  168. {
  169.     int16_t tmp[146 + 60], *ptr0, *ptr1;
  170.     const int16_t *filter;
  171.     int i, t, off;
  172.  
  173.     t = dec->offset2[quart];
  174.     if(t == 127){
  175.         memset(dec->newvec, 0, 60 * sizeof(*dec->newvec));
  176.         return;
  177.     }
  178.     for(i = 0; i < 146; i++)
  179.         tmp[i] = dec->filtbuf[i];
  180.     off = (t / 25) + dec->offset1[quart >> 1] + 18;
  181.     off = av_clip(off, 0, 145);
  182.     ptr0 = tmp + 145 - off;
  183.     ptr1 = tmp + 146;
  184.     filter = ts_order2_coeffs + (t % 25) * 2;
  185.     for(i = 0; i < 60; i++){
  186.         t = (ptr0[0] * filter[0] + ptr0[1] * filter[1] + 0x2000) >> 14;
  187.         ptr0++;
  188.         dec->newvec[i] = t;
  189.         ptr1[i] = t;
  190.     }
  191. }
  192.  
  193. static void truespeech_place_pulses(TSContext *dec, int16_t *out, int quart)
  194. {
  195.     int16_t tmp[7];
  196.     int i, j, t;
  197.     const int16_t *ptr1;
  198.     int16_t *ptr2;
  199.     int coef;
  200.  
  201.     memset(out, 0, 60 * sizeof(*out));
  202.     for(i = 0; i < 7; i++) {
  203.         t = dec->pulseval[quart] & 3;
  204.         dec->pulseval[quart] >>= 2;
  205.         tmp[6 - i] = ts_pulse_scales[dec->pulseoff[quart] * 4 + t];
  206.     }
  207.  
  208.     coef = dec->pulsepos[quart] >> 15;
  209.     ptr1 = ts_pulse_values + 30;
  210.     ptr2 = tmp;
  211.     for(i = 0, j = 3; (i < 30) && (j > 0); i++){
  212.         t = *ptr1++;
  213.         if(coef >= t)
  214.             coef -= t;
  215.         else{
  216.             out[i] = *ptr2++;
  217.             ptr1 += 30;
  218.             j--;
  219.         }
  220.     }
  221.     coef = dec->pulsepos[quart] & 0x7FFF;
  222.     ptr1 = ts_pulse_values;
  223.     for(i = 30, j = 4; (i < 60) && (j > 0); i++){
  224.         t = *ptr1++;
  225.         if(coef >= t)
  226.             coef -= t;
  227.         else{
  228.             out[i] = *ptr2++;
  229.             ptr1 += 30;
  230.             j--;
  231.         }
  232.     }
  233.  
  234. }
  235.  
  236. static void truespeech_update_filters(TSContext *dec, int16_t *out, int quart)
  237. {
  238.     int i;
  239.  
  240.     memmove(dec->filtbuf, &dec->filtbuf[60], 86 * sizeof(*dec->filtbuf));
  241.     for(i = 0; i < 60; i++){
  242.         dec->filtbuf[i + 86] = out[i] + dec->newvec[i] - (dec->newvec[i] >> 3);
  243.         out[i] += dec->newvec[i];
  244.     }
  245. }
  246.  
  247. static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
  248. {
  249.     int i,k;
  250.     int t[8];
  251.     int16_t *ptr0, *ptr1;
  252.  
  253.     ptr0 = dec->tmp1;
  254.     ptr1 = dec->filters + quart * 8;
  255.     for(i = 0; i < 60; i++){
  256.         int sum = 0;
  257.         for(k = 0; k < 8; k++)
  258.             sum += ptr0[k] * ptr1[k];
  259.         sum = (sum + (out[i] << 12) + 0x800) >> 12;
  260.         out[i] = av_clip(sum, -0x7FFE, 0x7FFE);
  261.         for(k = 7; k > 0; k--)
  262.             ptr0[k] = ptr0[k - 1];
  263.         ptr0[0] = out[i];
  264.     }
  265.  
  266.     for(i = 0; i < 8; i++)
  267.         t[i] = (ts_decay_35_64[i] * ptr1[i]) >> 15;
  268.  
  269.     ptr0 = dec->tmp2;
  270.     for(i = 0; i < 60; i++){
  271.         int sum = 0;
  272.         for(k = 0; k < 8; k++)
  273.             sum += ptr0[k] * t[k];
  274.         for(k = 7; k > 0; k--)
  275.             ptr0[k] = ptr0[k - 1];
  276.         ptr0[0] = out[i];
  277.         out[i] = ((out[i] << 12) - sum) >> 12;
  278.     }
  279.  
  280.     for(i = 0; i < 8; i++)
  281.         t[i] = (ts_decay_3_4[i] * ptr1[i]) >> 15;
  282.  
  283.     ptr0 = dec->tmp3;
  284.     for(i = 0; i < 60; i++){
  285.         int sum = out[i] << 12;
  286.         for(k = 0; k < 8; k++)
  287.             sum += ptr0[k] * t[k];
  288.         for(k = 7; k > 0; k--)
  289.             ptr0[k] = ptr0[k - 1];
  290.         ptr0[0] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
  291.  
  292.         sum = ((ptr0[1] * (dec->filtval - (dec->filtval >> 2))) >> 4) + sum;
  293.         sum = sum - (sum >> 3);
  294.         out[i] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
  295.     }
  296. }
  297.  
  298. static void truespeech_save_prevvec(TSContext *c)
  299. {
  300.     int i;
  301.  
  302.     for(i = 0; i < 8; i++)
  303.         c->prevfilt[i] = c->cvector[i];
  304. }
  305.  
  306. static int truespeech_decode_frame(AVCodecContext *avctx, void *data,
  307.                                    int *got_frame_ptr, AVPacket *avpkt)
  308. {
  309.     AVFrame *frame     = data;
  310.     const uint8_t *buf = avpkt->data;
  311.     int buf_size = avpkt->size;
  312.     TSContext *c = avctx->priv_data;
  313.  
  314.     int i, j;
  315.     int16_t *samples;
  316.     int iterations, ret;
  317.  
  318.     iterations = buf_size / 32;
  319.  
  320.     if (!iterations) {
  321.         av_log(avctx, AV_LOG_ERROR,
  322.                "Too small input buffer (%d bytes), need at least 32 bytes\n", buf_size);
  323.         return -1;
  324.     }
  325.  
  326.     /* get output buffer */
  327.     frame->nb_samples = iterations * 240;
  328.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
  329.         return ret;
  330.     samples = (int16_t *)frame->data[0];
  331.  
  332.     memset(samples, 0, iterations * 240 * sizeof(*samples));
  333.  
  334.     for(j = 0; j < iterations; j++) {
  335.         truespeech_read_frame(c, buf);
  336.         buf += 32;
  337.  
  338.         truespeech_correlate_filter(c);
  339.         truespeech_filters_merge(c);
  340.  
  341.         for(i = 0; i < 4; i++) {
  342.             truespeech_apply_twopoint_filter(c, i);
  343.             truespeech_place_pulses  (c, samples, i);
  344.             truespeech_update_filters(c, samples, i);
  345.             truespeech_synth         (c, samples, i);
  346.             samples += 60;
  347.         }
  348.  
  349.         truespeech_save_prevvec(c);
  350.     }
  351.  
  352.     *got_frame_ptr = 1;
  353.  
  354.     return buf_size;
  355. }
  356.  
  357. AVCodec ff_truespeech_decoder = {
  358.     .name           = "truespeech",
  359.     .long_name      = NULL_IF_CONFIG_SMALL("DSP Group TrueSpeech"),
  360.     .type           = AVMEDIA_TYPE_AUDIO,
  361.     .id             = AV_CODEC_ID_TRUESPEECH,
  362.     .priv_data_size = sizeof(TSContext),
  363.     .init           = truespeech_decode_init,
  364.     .decode         = truespeech_decode_frame,
  365.     .capabilities   = CODEC_CAP_DR1,
  366. };
  367.