1 /*********************************************************************** 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. 3 Redistribution and use in source and binary forms, with or without 4 modification, are permitted provided that the following conditions 5 are met: 6 - Redistributions of source code must retain the above copyright notice, 7 this list of conditions and the following disclaimer. 8 - Redistributions in binary form must reproduce the above copyright 9 notice, this list of conditions and the following disclaimer in the 10 documentation and/or other materials provided with the distribution. 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the 12 names of specific contributors, may be used to endorse or promote 13 products derived from this software without specific prior written 14 permission. 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 POSSIBILITY OF SUCH DAMAGE. 26 ***********************************************************************/ 27 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include "main_FIX.h" 33 #include "stack_alloc.h" 34 #include "tuning_parameters.h" 35 36 /* Low Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode with lower bitrate */ 37 static OPUS_INLINE void silk_LBRR_encode_FIX( 38 silk_encoder_state_FIX *psEnc, /* I/O Pointer to Silk FIX encoder state */ 39 silk_encoder_control_FIX *psEncCtrl, /* I/O Pointer to Silk FIX encoder control struct */ 40 const opus_int32 xfw_Q3[], /* I Input signal */ 41 opus_int condCoding /* I The type of conditional coding used so far for this frame */ 42 ); 43 44 void silk_encode_do_VAD_FIX( 45 silk_encoder_state_FIX *psEnc /* I/O Pointer to Silk FIX encoder state */ 46 ) 47 { 48 /****************************/ 49 /* Voice Activity Detection */ 50 /****************************/ 51 silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf + 1 ); 52 53 /**************************************************/ 54 /* Convert speech activity into VAD and DTX flags */ 55 /**************************************************/ 56 if( psEnc->sCmn.speech_activity_Q8 < SILK_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ) ) { 57 psEnc->sCmn.indices.signalType = TYPE_NO_VOICE_ACTIVITY; 58 psEnc->sCmn.noSpeechCounter++; 59 if( psEnc->sCmn.noSpeechCounter < NB_SPEECH_FRAMES_BEFORE_DTX ) { 60 psEnc->sCmn.inDTX = 0; 61 } else if( psEnc->sCmn.noSpeechCounter > MAX_CONSECUTIVE_DTX + NB_SPEECH_FRAMES_BEFORE_DTX ) { 62 psEnc->sCmn.noSpeechCounter = NB_SPEECH_FRAMES_BEFORE_DTX; 63 psEnc->sCmn.inDTX = 0; 64 } 65 psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 0; 66 } else { 67 psEnc->sCmn.noSpeechCounter = 0; 68 psEnc->sCmn.inDTX = 0; 69 psEnc->sCmn.indices.signalType = TYPE_UNVOICED; 70 psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 1; 71 } 72 } 73 74 /****************/ 75 /* Encode frame */ 76 /****************/ 77 opus_int silk_encode_frame_FIX( 78 silk_encoder_state_FIX *psEnc, /* I/O Pointer to Silk FIX encoder state */ 79 opus_int32 *pnBytesOut, /* O Pointer to number of payload bytes; */ 80 ec_enc *psRangeEnc, /* I/O compressor data structure */ 81 opus_int condCoding, /* I The type of conditional coding to use */ 82 opus_int maxBits, /* I If > 0: maximum number of output bits */ 83 opus_int useCBR /* I Flag to force constant-bitrate operation */ 84 ) 85 { 86 silk_encoder_control_FIX sEncCtrl; 87 opus_int i, iter, maxIter, found_upper, found_lower, ret = 0; 88 opus_int16 *x_frame; 89 ec_enc sRangeEnc_copy, sRangeEnc_copy2; 90 silk_nsq_state sNSQ_copy, sNSQ_copy2; 91 opus_int32 seed_copy, nBits, nBits_lower, nBits_upper, gainMult_lower, gainMult_upper; 92 opus_int32 gainsID, gainsID_lower, gainsID_upper; 93 opus_int16 gainMult_Q8; 94 opus_int16 ec_prevLagIndex_copy; 95 opus_int ec_prevSignalType_copy; 96 opus_int8 LastGainIndex_copy2; 97 SAVE_STACK; 98 99 /* This is totally unnecessary but many compilers (including gcc) are too dumb to realise it */ 100 LastGainIndex_copy2 = nBits_lower = nBits_upper = gainMult_lower = gainMult_upper = 0; 101 102 psEnc->sCmn.indices.Seed = psEnc->sCmn.frameCounter++ & 3; 103 104 /**************************************************************/ 105 /* Set up Input Pointers, and insert frame in input buffer */ 106 /*************************************************************/ 107 /* start of frame to encode */ 108 x_frame = psEnc->x_buf + psEnc->sCmn.ltp_mem_length; 109 110 /***************************************/ 111 /* Ensure smooth bandwidth transitions */ 112 /***************************************/ 113 silk_LP_variable_cutoff( &psEnc->sCmn.sLP, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length ); 114 115 /*******************************************/ 116 /* Copy new frame to front of input buffer */ 117 /*******************************************/ 118 silk_memcpy( x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length * sizeof( opus_int16 ) ); 119 120 if( !psEnc->sCmn.prefillFlag ) { 121 VARDECL( opus_int32, xfw_Q3 ); 122 VARDECL( opus_int16, res_pitch ); 123 VARDECL( opus_uint8, ec_buf_copy ); 124 opus_int16 *res_pitch_frame; 125 126 ALLOC( res_pitch, 127 psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length 128 + psEnc->sCmn.ltp_mem_length, opus_int16 ); 129 /* start of pitch LPC residual frame */ 130 res_pitch_frame = res_pitch + psEnc->sCmn.ltp_mem_length; 131 132 /*****************************************/ 133 /* Find pitch lags, initial LPC analysis */ 134 /*****************************************/ 135 silk_find_pitch_lags_FIX( psEnc, &sEncCtrl, res_pitch, x_frame, psEnc->sCmn.arch ); 136 137 /************************/ 138 /* Noise shape analysis */ 139 /************************/ 140 silk_noise_shape_analysis_FIX( psEnc, &sEncCtrl, res_pitch_frame, x_frame, psEnc->sCmn.arch ); 141 142 /***************************************************/ 143 /* Find linear prediction coefficients (LPC + LTP) */ 144 /***************************************************/ 145 silk_find_pred_coefs_FIX( psEnc, &sEncCtrl, res_pitch, x_frame, condCoding ); 146 147 /****************************************/ 148 /* Process gains */ 149 /****************************************/ 150 silk_process_gains_FIX( psEnc, &sEncCtrl, condCoding ); 151 152 /*****************************************/ 153 /* Prefiltering for noise shaper */ 154 /*****************************************/ 155 ALLOC( xfw_Q3, psEnc->sCmn.frame_length, opus_int32 ); 156 silk_prefilter_FIX( psEnc, &sEncCtrl, xfw_Q3, x_frame ); 157 158 /****************************************/ 159 /* Low Bitrate Redundant Encoding */ 160 /****************************************/ 161 silk_LBRR_encode_FIX( psEnc, &sEncCtrl, xfw_Q3, condCoding ); 162 163 /* Loop over quantizer and entropy coding to control bitrate */ 164 maxIter = 6; 165 gainMult_Q8 = SILK_FIX_CONST( 1, 8 ); 166 found_lower = 0; 167 found_upper = 0; 168 gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr ); 169 gainsID_lower = -1; 170 gainsID_upper = -1; 171 /* Copy part of the input state */ 172 silk_memcpy( &sRangeEnc_copy, psRangeEnc, sizeof( ec_enc ) ); 173 silk_memcpy( &sNSQ_copy, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) ); 174 seed_copy = psEnc->sCmn.indices.Seed; 175 ec_prevLagIndex_copy = psEnc->sCmn.ec_prevLagIndex; 176 ec_prevSignalType_copy = psEnc->sCmn.ec_prevSignalType; 177 ALLOC( ec_buf_copy, 1275, opus_uint8 ); 178 for( iter = 0; ; iter++ ) { 179 if( gainsID == gainsID_lower ) { 180 nBits = nBits_lower; 181 } else if( gainsID == gainsID_upper ) { 182 nBits = nBits_upper; 183 } else { 184 /* Restore part of the input state */ 185 if( iter > 0 ) { 186 silk_memcpy( psRangeEnc, &sRangeEnc_copy, sizeof( ec_enc ) ); 187 silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy, sizeof( silk_nsq_state ) ); 188 psEnc->sCmn.indices.Seed = seed_copy; 189 psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy; 190 psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy; 191 } 192 193 /*****************************************/ 194 /* Noise shaping quantization */ 195 /*****************************************/ 196 if( psEnc->sCmn.nStatesDelayedDecision > 1 || psEnc->sCmn.warping_Q16 > 0 ) { 197 silk_NSQ_del_dec( &psEnc->sCmn, &psEnc->sCmn.sNSQ, &psEnc->sCmn.indices, xfw_Q3, psEnc->sCmn.pulses, 198 sEncCtrl.PredCoef_Q12[ 0 ], sEncCtrl.LTPCoef_Q14, sEncCtrl.AR2_Q13, sEncCtrl.HarmShapeGain_Q14, 199 sEncCtrl.Tilt_Q14, sEncCtrl.LF_shp_Q14, sEncCtrl.Gains_Q16, sEncCtrl.pitchL, sEncCtrl.Lambda_Q10, sEncCtrl.LTP_scale_Q14 ); 200 } else { 201 silk_NSQ( &psEnc->sCmn, &psEnc->sCmn.sNSQ, &psEnc->sCmn.indices, xfw_Q3, psEnc->sCmn.pulses, 202 sEncCtrl.PredCoef_Q12[ 0 ], sEncCtrl.LTPCoef_Q14, sEncCtrl.AR2_Q13, sEncCtrl.HarmShapeGain_Q14, 203 sEncCtrl.Tilt_Q14, sEncCtrl.LF_shp_Q14, sEncCtrl.Gains_Q16, sEncCtrl.pitchL, sEncCtrl.Lambda_Q10, sEncCtrl.LTP_scale_Q14 ); 204 } 205 206 /****************************************/ 207 /* Encode Parameters */ 208 /****************************************/ 209 silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding ); 210 211 /****************************************/ 212 /* Encode Excitation Signal */ 213 /****************************************/ 214 silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType, 215 psEnc->sCmn.pulses, psEnc->sCmn.frame_length ); 216 217 nBits = ec_tell( psRangeEnc ); 218 219 if( useCBR == 0 && iter == 0 && nBits <= maxBits ) { 220 break; 221 } 222 } 223 224 if( iter == maxIter ) { 225 if( found_lower && ( gainsID == gainsID_lower || nBits > maxBits ) ) { 226 /* Restore output state from earlier iteration that did meet the bitrate budget */ 227 silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) ); 228 silk_assert( sRangeEnc_copy2.offs <= 1275 ); 229 silk_memcpy( psRangeEnc->buf, ec_buf_copy, sRangeEnc_copy2.offs ); 230 silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy2, sizeof( silk_nsq_state ) ); 231 psEnc->sShape.LastGainIndex = LastGainIndex_copy2; 232 } 233 break; 234 } 235 236 if( nBits > maxBits ) { 237 if( found_lower == 0 && iter >= 2 ) { 238 /* Adjust the quantizer's rate/distortion tradeoff and discard previous "upper" results */ 239 sEncCtrl.Lambda_Q10 = silk_ADD_RSHIFT32( sEncCtrl.Lambda_Q10, sEncCtrl.Lambda_Q10, 1 ); 240 found_upper = 0; 241 gainsID_upper = -1; 242 } else { 243 found_upper = 1; 244 nBits_upper = nBits; 245 gainMult_upper = gainMult_Q8; 246 gainsID_upper = gainsID; 247 } 248 } else if( nBits < maxBits - 5 ) { 249 found_lower = 1; 250 nBits_lower = nBits; 251 gainMult_lower = gainMult_Q8; 252 if( gainsID != gainsID_lower ) { 253 gainsID_lower = gainsID; 254 /* Copy part of the output state */ 255 silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) ); 256 silk_assert( psRangeEnc->offs <= 1275 ); 257 silk_memcpy( ec_buf_copy, psRangeEnc->buf, psRangeEnc->offs ); 258 silk_memcpy( &sNSQ_copy2, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) ); 259 LastGainIndex_copy2 = psEnc->sShape.LastGainIndex; 260 } 261 } else { 262 /* Within 5 bits of budget: close enough */ 263 break; 264 } 265 266 if( ( found_lower & found_upper ) == 0 ) { 267 /* Adjust gain according to high-rate rate/distortion curve */ 268 opus_int32 gain_factor_Q16; 269 gain_factor_Q16 = silk_log2lin( silk_LSHIFT( nBits - maxBits, 7 ) / psEnc->sCmn.frame_length + SILK_FIX_CONST( 16, 7 ) ); 270 gain_factor_Q16 = silk_min_32( gain_factor_Q16, SILK_FIX_CONST( 2, 16 ) ); 271 if( nBits > maxBits ) { 272 gain_factor_Q16 = silk_max_32( gain_factor_Q16, SILK_FIX_CONST( 1.3, 16 ) ); 273 } 274 gainMult_Q8 = silk_SMULWB( gain_factor_Q16, gainMult_Q8 ); 275 } else { 276 /* Adjust gain by interpolating */ 277 gainMult_Q8 = gainMult_lower + silk_DIV32_16( silk_MUL( gainMult_upper - gainMult_lower, maxBits - nBits_lower ), nBits_upper - nBits_lower ); 278 /* New gain multplier must be between 25% and 75% of old range (note that gainMult_upper < gainMult_lower) */ 279 if( gainMult_Q8 > silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 ) ) { 280 gainMult_Q8 = silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 ); 281 } else 282 if( gainMult_Q8 < silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 ) ) { 283 gainMult_Q8 = silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 ); 284 } 285 } 286 287 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { 288 sEncCtrl.Gains_Q16[ i ] = silk_LSHIFT_SAT32( silk_SMULWB( sEncCtrl.GainsUnq_Q16[ i ], gainMult_Q8 ), 8 ); 289 } 290 291 /* Quantize gains */ 292 psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev; 293 silk_gains_quant( psEnc->sCmn.indices.GainsIndices, sEncCtrl.Gains_Q16, 294 &psEnc->sShape.LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr ); 295 296 /* Unique identifier of gains vector */ 297 gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr ); 298 } 299 } 300 301 /* Update input buffer */ 302 silk_memmove( psEnc->x_buf, &psEnc->x_buf[ psEnc->sCmn.frame_length ], 303 ( psEnc->sCmn.ltp_mem_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz ) * sizeof( opus_int16 ) ); 304 305 /* Exit without entropy coding */ 306 if( psEnc->sCmn.prefillFlag ) { 307 /* No payload */ 308 *pnBytesOut = 0; 309 RESTORE_STACK; 310 return ret; 311 } 312 313 /* Parameters needed for next frame */ 314 psEnc->sCmn.prevLag = sEncCtrl.pitchL[ psEnc->sCmn.nb_subfr - 1 ]; 315 psEnc->sCmn.prevSignalType = psEnc->sCmn.indices.signalType; 316 317 /****************************************/ 318 /* Finalize payload */ 319 /****************************************/ 320 psEnc->sCmn.first_frame_after_reset = 0; 321 /* Payload size */ 322 *pnBytesOut = silk_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 ); 323 324 RESTORE_STACK; 325 return ret; 326 } 327 328 /* Low-Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode excitation at lower bitrate */ 329 static OPUS_INLINE void silk_LBRR_encode_FIX( 330 silk_encoder_state_FIX *psEnc, /* I/O Pointer to Silk FIX encoder state */ 331 silk_encoder_control_FIX *psEncCtrl, /* I/O Pointer to Silk FIX encoder control struct */ 332 const opus_int32 xfw_Q3[], /* I Input signal */ 333 opus_int condCoding /* I The type of conditional coding used so far for this frame */ 334 ) 335 { 336 opus_int32 TempGains_Q16[ MAX_NB_SUBFR ]; 337 SideInfoIndices *psIndices_LBRR = &psEnc->sCmn.indices_LBRR[ psEnc->sCmn.nFramesEncoded ]; 338 silk_nsq_state sNSQ_LBRR; 339 340 /*******************************************/ 341 /* Control use of inband LBRR */ 342 /*******************************************/ 343 if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.speech_activity_Q8 > SILK_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) { 344 psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded ] = 1; 345 346 /* Copy noise shaping quantizer state and quantization indices from regular encoding */ 347 silk_memcpy( &sNSQ_LBRR, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) ); 348 silk_memcpy( psIndices_LBRR, &psEnc->sCmn.indices, sizeof( SideInfoIndices ) ); 349 350 /* Save original gains */ 351 silk_memcpy( TempGains_Q16, psEncCtrl->Gains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) ); 352 353 if( psEnc->sCmn.nFramesEncoded == 0 || psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded - 1 ] == 0 ) { 354 /* First frame in packet or previous frame not LBRR coded */ 355 psEnc->sCmn.LBRRprevLastGainIndex = psEnc->sShape.LastGainIndex; 356 357 /* Increase Gains to get target LBRR rate */ 358 psIndices_LBRR->GainsIndices[ 0 ] = psIndices_LBRR->GainsIndices[ 0 ] + psEnc->sCmn.LBRR_GainIncreases; 359 psIndices_LBRR->GainsIndices[ 0 ] = silk_min_int( psIndices_LBRR->GainsIndices[ 0 ], N_LEVELS_QGAIN - 1 ); 360 } 361 362 /* Decode to get gains in sync with decoder */ 363 /* Overwrite unquantized gains with quantized gains */ 364 silk_gains_dequant( psEncCtrl->Gains_Q16, psIndices_LBRR->GainsIndices, 365 &psEnc->sCmn.LBRRprevLastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr ); 366 367 /*****************************************/ 368 /* Noise shaping quantization */ 369 /*****************************************/ 370 if( psEnc->sCmn.nStatesDelayedDecision > 1 || psEnc->sCmn.warping_Q16 > 0 ) { 371 silk_NSQ_del_dec( &psEnc->sCmn, &sNSQ_LBRR, psIndices_LBRR, xfw_Q3, 372 psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->LTPCoef_Q14, 373 psEncCtrl->AR2_Q13, psEncCtrl->HarmShapeGain_Q14, psEncCtrl->Tilt_Q14, psEncCtrl->LF_shp_Q14, 374 psEncCtrl->Gains_Q16, psEncCtrl->pitchL, psEncCtrl->Lambda_Q10, psEncCtrl->LTP_scale_Q14 ); 375 } else { 376 silk_NSQ( &psEnc->sCmn, &sNSQ_LBRR, psIndices_LBRR, xfw_Q3, 377 psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->LTPCoef_Q14, 378 psEncCtrl->AR2_Q13, psEncCtrl->HarmShapeGain_Q14, psEncCtrl->Tilt_Q14, psEncCtrl->LF_shp_Q14, 379 psEncCtrl->Gains_Q16, psEncCtrl->pitchL, psEncCtrl->Lambda_Q10, psEncCtrl->LTP_scale_Q14 ); 380 } 381 382 /* Restore original gains */ 383 silk_memcpy( psEncCtrl->Gains_Q16, TempGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) ); 384 } 385 } 386
