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 "bswapdsp.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 */ 38typedef struct { 39 BswapDSPContext bdsp; 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 61static 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_bswapdsp_init(&c->bdsp); 74 75 return 0; 76} 77 78static void truespeech_read_frame(TSContext *dec, const uint8_t *input) 79{ 80 GetBitContext gb; 81 82 dec->bdsp.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 126static 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 146static 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 167static 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 193static 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 236static 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 247static 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 298static 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 306static 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 357AVCodec 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