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 #include "define.h" 32 #include "API.h" 33 #include "control.h" 34 #include "typedef.h" 35 #include "stack_alloc.h" 36 #include "structs.h" 37 #include "tuning_parameters.h" 38 #ifdef FIXED_POINT 39 #include "main_FIX.h" 40 #else 41 #include "main_FLP.h" 42 #endif 43 44 /***************************************/ 45 /* Read control structure from encoder */ 46 /***************************************/ 47 static opus_int silk_QueryEncoder( /* O Returns error code */ 48 const void *encState, /* I State */ 49 silk_EncControlStruct *encStatus /* O Encoder Status */ 50 ); 51 52 /****************************************/ 53 /* Encoder functions */ 54 /****************************************/ 55 56 opus_int silk_Get_Encoder_Size( /* O Returns error code */ 57 opus_int *encSizeBytes /* O Number of bytes in SILK encoder state */ 58 ) 59 { 60 opus_int ret = SILK_NO_ERROR; 61 62 *encSizeBytes = sizeof( silk_encoder ); 63 64 return ret; 65 } 66 67 /*************************/ 68 /* Init or Reset encoder */ 69 /*************************/ 70 opus_int silk_InitEncoder( /* O Returns error code */ 71 void *encState, /* I/O State */ 72 int arch, /* I Run-time architecture */ 73 silk_EncControlStruct *encStatus /* O Encoder Status */ 74 ) 75 { 76 silk_encoder *psEnc; 77 opus_int n, ret = SILK_NO_ERROR; 78 79 psEnc = (silk_encoder *)encState; 80 81 /* Reset encoder */ 82 silk_memset( psEnc, 0, sizeof( silk_encoder ) ); 83 for( n = 0; n < ENCODER_NUM_CHANNELS; n++ ) { 84 if( ret += silk_init_encoder( &psEnc->state_Fxx[ n ], arch ) ) { 85 silk_assert( 0 ); 86 } 87 } 88 89 psEnc->nChannelsAPI = 1; 90 psEnc->nChannelsInternal = 1; 91 92 /* Read control structure */ 93 if( ret += silk_QueryEncoder( encState, encStatus ) ) { 94 silk_assert( 0 ); 95 } 96 97 return ret; 98 } 99 100 /***************************************/ 101 /* Read control structure from encoder */ 102 /***************************************/ 103 static opus_int silk_QueryEncoder( /* O Returns error code */ 104 const void *encState, /* I State */ 105 silk_EncControlStruct *encStatus /* O Encoder Status */ 106 ) 107 { 108 opus_int ret = SILK_NO_ERROR; 109 silk_encoder_state_Fxx *state_Fxx; 110 silk_encoder *psEnc = (silk_encoder *)encState; 111 112 state_Fxx = psEnc->state_Fxx; 113 114 encStatus->nChannelsAPI = psEnc->nChannelsAPI; 115 encStatus->nChannelsInternal = psEnc->nChannelsInternal; 116 encStatus->API_sampleRate = state_Fxx[ 0 ].sCmn.API_fs_Hz; 117 encStatus->maxInternalSampleRate = state_Fxx[ 0 ].sCmn.maxInternal_fs_Hz; 118 encStatus->minInternalSampleRate = state_Fxx[ 0 ].sCmn.minInternal_fs_Hz; 119 encStatus->desiredInternalSampleRate = state_Fxx[ 0 ].sCmn.desiredInternal_fs_Hz; 120 encStatus->payloadSize_ms = state_Fxx[ 0 ].sCmn.PacketSize_ms; 121 encStatus->bitRate = state_Fxx[ 0 ].sCmn.TargetRate_bps; 122 encStatus->packetLossPercentage = state_Fxx[ 0 ].sCmn.PacketLoss_perc; 123 encStatus->complexity = state_Fxx[ 0 ].sCmn.Complexity; 124 encStatus->useInBandFEC = state_Fxx[ 0 ].sCmn.useInBandFEC; 125 encStatus->useDTX = state_Fxx[ 0 ].sCmn.useDTX; 126 encStatus->useCBR = state_Fxx[ 0 ].sCmn.useCBR; 127 encStatus->internalSampleRate = silk_SMULBB( state_Fxx[ 0 ].sCmn.fs_kHz, 1000 ); 128 encStatus->allowBandwidthSwitch = state_Fxx[ 0 ].sCmn.allow_bandwidth_switch; 129 encStatus->inWBmodeWithoutVariableLP = state_Fxx[ 0 ].sCmn.fs_kHz == 16 && state_Fxx[ 0 ].sCmn.sLP.mode == 0; 130 131 return ret; 132 } 133 134 135 /**************************/ 136 /* Encode frame with Silk */ 137 /**************************/ 138 /* Note: if prefillFlag is set, the input must contain 10 ms of audio, irrespective of what */ 139 /* encControl->payloadSize_ms is set to */ 140 opus_int silk_Encode( /* O Returns error code */ 141 void *encState, /* I/O State */ 142 silk_EncControlStruct *encControl, /* I Control status */ 143 const opus_int16 *samplesIn, /* I Speech sample input vector */ 144 opus_int nSamplesIn, /* I Number of samples in input vector */ 145 ec_enc *psRangeEnc, /* I/O Compressor data structure */ 146 opus_int32 *nBytesOut, /* I/O Number of bytes in payload (input: Max bytes) */ 147 const opus_int prefillFlag /* I Flag to indicate prefilling buffers no coding */ 148 ) 149 { 150 opus_int n, i, nBits, flags, tmp_payloadSize_ms = 0, tmp_complexity = 0, ret = 0; 151 opus_int nSamplesToBuffer, nSamplesToBufferMax, nBlocksOf10ms; 152 opus_int nSamplesFromInput = 0, nSamplesFromInputMax; 153 opus_int speech_act_thr_for_switch_Q8; 154 opus_int32 TargetRate_bps, MStargetRates_bps[ 2 ], channelRate_bps, LBRR_symbol, sum; 155 silk_encoder *psEnc = ( silk_encoder * )encState; 156 VARDECL( opus_int16, buf ); 157 opus_int transition, curr_block, tot_blocks; 158 SAVE_STACK; 159 160 if (encControl->reducedDependency) 161 { 162 psEnc->state_Fxx[0].sCmn.first_frame_after_reset = 1; 163 psEnc->state_Fxx[1].sCmn.first_frame_after_reset = 1; 164 } 165 psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded = psEnc->state_Fxx[ 1 ].sCmn.nFramesEncoded = 0; 166 167 /* Check values in encoder control structure */ 168 if( ( ret = check_control_input( encControl ) != 0 ) ) { 169 silk_assert( 0 ); 170 RESTORE_STACK; 171 return ret; 172 } 173 174 encControl->switchReady = 0; 175 176 if( encControl->nChannelsInternal > psEnc->nChannelsInternal ) { 177 /* Mono -> Stereo transition: init state of second channel and stereo state */ 178 ret += silk_init_encoder( &psEnc->state_Fxx[ 1 ], psEnc->state_Fxx[ 0 ].sCmn.arch ); 179 silk_memset( psEnc->sStereo.pred_prev_Q13, 0, sizeof( psEnc->sStereo.pred_prev_Q13 ) ); 180 silk_memset( psEnc->sStereo.sSide, 0, sizeof( psEnc->sStereo.sSide ) ); 181 psEnc->sStereo.mid_side_amp_Q0[ 0 ] = 0; 182 psEnc->sStereo.mid_side_amp_Q0[ 1 ] = 1; 183 psEnc->sStereo.mid_side_amp_Q0[ 2 ] = 0; 184 psEnc->sStereo.mid_side_amp_Q0[ 3 ] = 1; 185 psEnc->sStereo.width_prev_Q14 = 0; 186 psEnc->sStereo.smth_width_Q14 = SILK_FIX_CONST( 1, 14 ); 187 if( psEnc->nChannelsAPI == 2 ) { 188 silk_memcpy( &psEnc->state_Fxx[ 1 ].sCmn.resampler_state, &psEnc->state_Fxx[ 0 ].sCmn.resampler_state, sizeof( silk_resampler_state_struct ) ); 189 silk_memcpy( &psEnc->state_Fxx[ 1 ].sCmn.In_HP_State, &psEnc->state_Fxx[ 0 ].sCmn.In_HP_State, sizeof( psEnc->state_Fxx[ 1 ].sCmn.In_HP_State ) ); 190 } 191 } 192 193 transition = (encControl->payloadSize_ms != psEnc->state_Fxx[ 0 ].sCmn.PacketSize_ms) || (psEnc->nChannelsInternal != encControl->nChannelsInternal); 194 195 psEnc->nChannelsAPI = encControl->nChannelsAPI; 196 psEnc->nChannelsInternal = encControl->nChannelsInternal; 197 198 nBlocksOf10ms = silk_DIV32( 100 * nSamplesIn, encControl->API_sampleRate ); 199 tot_blocks = ( nBlocksOf10ms > 1 ) ? nBlocksOf10ms >> 1 : 1; 200 curr_block = 0; 201 if( prefillFlag ) { 202 /* Only accept input length of 10 ms */ 203 if( nBlocksOf10ms != 1 ) { 204 silk_assert( 0 ); 205 RESTORE_STACK; 206 return SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES; 207 } 208 /* Reset Encoder */ 209 for( n = 0; n < encControl->nChannelsInternal; n++ ) { 210 ret = silk_init_encoder( &psEnc->state_Fxx[ n ], psEnc->state_Fxx[ n ].sCmn.arch ); 211 silk_assert( !ret ); 212 } 213 tmp_payloadSize_ms = encControl->payloadSize_ms; 214 encControl->payloadSize_ms = 10; 215 tmp_complexity = encControl->complexity; 216 encControl->complexity = 0; 217 for( n = 0; n < encControl->nChannelsInternal; n++ ) { 218 psEnc->state_Fxx[ n ].sCmn.controlled_since_last_payload = 0; 219 psEnc->state_Fxx[ n ].sCmn.prefillFlag = 1; 220 } 221 } else { 222 /* Only accept input lengths that are a multiple of 10 ms */ 223 if( nBlocksOf10ms * encControl->API_sampleRate != 100 * nSamplesIn || nSamplesIn < 0 ) { 224 silk_assert( 0 ); 225 RESTORE_STACK; 226 return SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES; 227 } 228 /* Make sure no more than one packet can be produced */ 229 if( 1000 * (opus_int32)nSamplesIn > encControl->payloadSize_ms * encControl->API_sampleRate ) { 230 silk_assert( 0 ); 231 RESTORE_STACK; 232 return SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES; 233 } 234 } 235 236 TargetRate_bps = silk_RSHIFT32( encControl->bitRate, encControl->nChannelsInternal - 1 ); 237 for( n = 0; n < encControl->nChannelsInternal; n++ ) { 238 /* Force the side channel to the same rate as the mid */ 239 opus_int force_fs_kHz = (n==1) ? psEnc->state_Fxx[0].sCmn.fs_kHz : 0; 240 if( ( ret = silk_control_encoder( &psEnc->state_Fxx[ n ], encControl, TargetRate_bps, psEnc->allowBandwidthSwitch, n, force_fs_kHz ) ) != 0 ) { 241 silk_assert( 0 ); 242 RESTORE_STACK; 243 return ret; 244 } 245 if( psEnc->state_Fxx[n].sCmn.first_frame_after_reset || transition ) { 246 for( i = 0; i < psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket; i++ ) { 247 psEnc->state_Fxx[ n ].sCmn.LBRR_flags[ i ] = 0; 248 } 249 } 250 psEnc->state_Fxx[ n ].sCmn.inDTX = psEnc->state_Fxx[ n ].sCmn.useDTX; 251 } 252 silk_assert( encControl->nChannelsInternal == 1 || psEnc->state_Fxx[ 0 ].sCmn.fs_kHz == psEnc->state_Fxx[ 1 ].sCmn.fs_kHz ); 253 254 /* Input buffering/resampling and encoding */ 255 nSamplesToBufferMax = 256 10 * nBlocksOf10ms * psEnc->state_Fxx[ 0 ].sCmn.fs_kHz; 257 nSamplesFromInputMax = 258 silk_DIV32_16( nSamplesToBufferMax * 259 psEnc->state_Fxx[ 0 ].sCmn.API_fs_Hz, 260 psEnc->state_Fxx[ 0 ].sCmn.fs_kHz * 1000 ); 261 ALLOC( buf, nSamplesFromInputMax, opus_int16 ); 262 while( 1 ) { 263 nSamplesToBuffer = psEnc->state_Fxx[ 0 ].sCmn.frame_length - psEnc->state_Fxx[ 0 ].sCmn.inputBufIx; 264 nSamplesToBuffer = silk_min( nSamplesToBuffer, nSamplesToBufferMax ); 265 nSamplesFromInput = silk_DIV32_16( nSamplesToBuffer * psEnc->state_Fxx[ 0 ].sCmn.API_fs_Hz, psEnc->state_Fxx[ 0 ].sCmn.fs_kHz * 1000 ); 266 /* Resample and write to buffer */ 267 if( encControl->nChannelsAPI == 2 && encControl->nChannelsInternal == 2 ) { 268 opus_int id = psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded; 269 for( n = 0; n < nSamplesFromInput; n++ ) { 270 buf[ n ] = samplesIn[ 2 * n ]; 271 } 272 /* Making sure to start both resamplers from the same state when switching from mono to stereo */ 273 if( psEnc->nPrevChannelsInternal == 1 && id==0 ) { 274 silk_memcpy( &psEnc->state_Fxx[ 1 ].sCmn.resampler_state, &psEnc->state_Fxx[ 0 ].sCmn.resampler_state, sizeof(psEnc->state_Fxx[ 1 ].sCmn.resampler_state)); 275 } 276 277 ret += silk_resampler( &psEnc->state_Fxx[ 0 ].sCmn.resampler_state, 278 &psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.inputBufIx + 2 ], buf, nSamplesFromInput ); 279 psEnc->state_Fxx[ 0 ].sCmn.inputBufIx += nSamplesToBuffer; 280 281 nSamplesToBuffer = psEnc->state_Fxx[ 1 ].sCmn.frame_length - psEnc->state_Fxx[ 1 ].sCmn.inputBufIx; 282 nSamplesToBuffer = silk_min( nSamplesToBuffer, 10 * nBlocksOf10ms * psEnc->state_Fxx[ 1 ].sCmn.fs_kHz ); 283 for( n = 0; n < nSamplesFromInput; n++ ) { 284 buf[ n ] = samplesIn[ 2 * n + 1 ]; 285 } 286 ret += silk_resampler( &psEnc->state_Fxx[ 1 ].sCmn.resampler_state, 287 &psEnc->state_Fxx[ 1 ].sCmn.inputBuf[ psEnc->state_Fxx[ 1 ].sCmn.inputBufIx + 2 ], buf, nSamplesFromInput ); 288 289 psEnc->state_Fxx[ 1 ].sCmn.inputBufIx += nSamplesToBuffer; 290 } else if( encControl->nChannelsAPI == 2 && encControl->nChannelsInternal == 1 ) { 291 /* Combine left and right channels before resampling */ 292 for( n = 0; n < nSamplesFromInput; n++ ) { 293 sum = samplesIn[ 2 * n ] + samplesIn[ 2 * n + 1 ]; 294 buf[ n ] = (opus_int16)silk_RSHIFT_ROUND( sum, 1 ); 295 } 296 ret += silk_resampler( &psEnc->state_Fxx[ 0 ].sCmn.resampler_state, 297 &psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.inputBufIx + 2 ], buf, nSamplesFromInput ); 298 /* On the first mono frame, average the results for the two resampler states */ 299 if( psEnc->nPrevChannelsInternal == 2 && psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded == 0 ) { 300 ret += silk_resampler( &psEnc->state_Fxx[ 1 ].sCmn.resampler_state, 301 &psEnc->state_Fxx[ 1 ].sCmn.inputBuf[ psEnc->state_Fxx[ 1 ].sCmn.inputBufIx + 2 ], buf, nSamplesFromInput ); 302 for( n = 0; n < psEnc->state_Fxx[ 0 ].sCmn.frame_length; n++ ) { 303 psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.inputBufIx+n+2 ] = 304 silk_RSHIFT(psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.inputBufIx+n+2 ] 305 + psEnc->state_Fxx[ 1 ].sCmn.inputBuf[ psEnc->state_Fxx[ 1 ].sCmn.inputBufIx+n+2 ], 1); 306 } 307 } 308 psEnc->state_Fxx[ 0 ].sCmn.inputBufIx += nSamplesToBuffer; 309 } else { 310 silk_assert( encControl->nChannelsAPI == 1 && encControl->nChannelsInternal == 1 ); 311 silk_memcpy(buf, samplesIn, nSamplesFromInput*sizeof(opus_int16)); 312 ret += silk_resampler( &psEnc->state_Fxx[ 0 ].sCmn.resampler_state, 313 &psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.inputBufIx + 2 ], buf, nSamplesFromInput ); 314 psEnc->state_Fxx[ 0 ].sCmn.inputBufIx += nSamplesToBuffer; 315 } 316 317 samplesIn += nSamplesFromInput * encControl->nChannelsAPI; 318 nSamplesIn -= nSamplesFromInput; 319 320 /* Default */ 321 psEnc->allowBandwidthSwitch = 0; 322 323 /* Silk encoder */ 324 if( psEnc->state_Fxx[ 0 ].sCmn.inputBufIx >= psEnc->state_Fxx[ 0 ].sCmn.frame_length ) { 325 /* Enough data in input buffer, so encode */ 326 silk_assert( psEnc->state_Fxx[ 0 ].sCmn.inputBufIx == psEnc->state_Fxx[ 0 ].sCmn.frame_length ); 327 silk_assert( encControl->nChannelsInternal == 1 || psEnc->state_Fxx[ 1 ].sCmn.inputBufIx == psEnc->state_Fxx[ 1 ].sCmn.frame_length ); 328 329 /* Deal with LBRR data */ 330 if( psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded == 0 && !prefillFlag ) { 331 /* Create space at start of payload for VAD and FEC flags */ 332 opus_uint8 iCDF[ 2 ] = { 0, 0 }; 333 iCDF[ 0 ] = 256 - silk_RSHIFT( 256, ( psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket + 1 ) * encControl->nChannelsInternal ); 334 ec_enc_icdf( psRangeEnc, 0, iCDF, 8 ); 335 336 /* Encode any LBRR data from previous packet */ 337 /* Encode LBRR flags */ 338 for( n = 0; n < encControl->nChannelsInternal; n++ ) { 339 LBRR_symbol = 0; 340 for( i = 0; i < psEnc->state_Fxx[ n ].sCmn.nFramesPerPacket; i++ ) { 341 LBRR_symbol |= silk_LSHIFT( psEnc->state_Fxx[ n ].sCmn.LBRR_flags[ i ], i ); 342 } 343 psEnc->state_Fxx[ n ].sCmn.LBRR_flag = LBRR_symbol > 0 ? 1 : 0; 344 if( LBRR_symbol && psEnc->state_Fxx[ n ].sCmn.nFramesPerPacket > 1 ) { 345 ec_enc_icdf( psRangeEnc, LBRR_symbol - 1, silk_LBRR_flags_iCDF_ptr[ psEnc->state_Fxx[ n ].sCmn.nFramesPerPacket - 2 ], 8 ); 346 } 347 } 348 349 /* Code LBRR indices and excitation signals */ 350 for( i = 0; i < psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket; i++ ) { 351 for( n = 0; n < encControl->nChannelsInternal; n++ ) { 352 if( psEnc->state_Fxx[ n ].sCmn.LBRR_flags[ i ] ) { 353 opus_int condCoding; 354 355 if( encControl->nChannelsInternal == 2 && n == 0 ) { 356 silk_stereo_encode_pred( psRangeEnc, psEnc->sStereo.predIx[ i ] ); 357 /* For LBRR data there's no need to code the mid-only flag if the side-channel LBRR flag is set */ 358 if( psEnc->state_Fxx[ 1 ].sCmn.LBRR_flags[ i ] == 0 ) { 359 silk_stereo_encode_mid_only( psRangeEnc, psEnc->sStereo.mid_only_flags[ i ] ); 360 } 361 } 362 /* Use conditional coding if previous frame available */ 363 if( i > 0 && psEnc->state_Fxx[ n ].sCmn.LBRR_flags[ i - 1 ] ) { 364 condCoding = CODE_CONDITIONALLY; 365 } else { 366 condCoding = CODE_INDEPENDENTLY; 367 } 368 silk_encode_indices( &psEnc->state_Fxx[ n ].sCmn, psRangeEnc, i, 1, condCoding ); 369 silk_encode_pulses( psRangeEnc, psEnc->state_Fxx[ n ].sCmn.indices_LBRR[i].signalType, psEnc->state_Fxx[ n ].sCmn.indices_LBRR[i].quantOffsetType, 370 psEnc->state_Fxx[ n ].sCmn.pulses_LBRR[ i ], psEnc->state_Fxx[ n ].sCmn.frame_length ); 371 } 372 } 373 } 374 375 /* Reset LBRR flags */ 376 for( n = 0; n < encControl->nChannelsInternal; n++ ) { 377 silk_memset( psEnc->state_Fxx[ n ].sCmn.LBRR_flags, 0, sizeof( psEnc->state_Fxx[ n ].sCmn.LBRR_flags ) ); 378 } 379 } 380 381 silk_HP_variable_cutoff( psEnc->state_Fxx ); 382 383 /* Total target bits for packet */ 384 nBits = silk_DIV32_16( silk_MUL( encControl->bitRate, encControl->payloadSize_ms ), 1000 ); 385 /* Subtract half of the bits already used */ 386 if( !prefillFlag ) { 387 nBits -= ec_tell( psRangeEnc ) >> 1; 388 } 389 /* Divide by number of uncoded frames left in packet */ 390 nBits = silk_DIV32_16( nBits, psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket - psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ); 391 /* Convert to bits/second */ 392 if( encControl->payloadSize_ms == 10 ) { 393 TargetRate_bps = silk_SMULBB( nBits, 100 ); 394 } else { 395 TargetRate_bps = silk_SMULBB( nBits, 50 ); 396 } 397 /* Subtract fraction of bits in excess of target in previous packets */ 398 TargetRate_bps -= silk_DIV32_16( silk_MUL( psEnc->nBitsExceeded, 1000 ), BITRESERVOIR_DECAY_TIME_MS ); 399 /* Never exceed input bitrate */ 400 TargetRate_bps = silk_LIMIT( TargetRate_bps, encControl->bitRate, 5000 ); 401 402 /* Convert Left/Right to Mid/Side */ 403 if( encControl->nChannelsInternal == 2 ) { 404 silk_stereo_LR_to_MS( &psEnc->sStereo, &psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ 2 ], &psEnc->state_Fxx[ 1 ].sCmn.inputBuf[ 2 ], 405 psEnc->sStereo.predIx[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ], &psEnc->sStereo.mid_only_flags[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ], 406 MStargetRates_bps, TargetRate_bps, psEnc->state_Fxx[ 0 ].sCmn.speech_activity_Q8, encControl->toMono, 407 psEnc->state_Fxx[ 0 ].sCmn.fs_kHz, psEnc->state_Fxx[ 0 ].sCmn.frame_length ); 408 if( psEnc->sStereo.mid_only_flags[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ] == 0 ) { 409 /* Reset side channel encoder memory for first frame with side coding */ 410 if( psEnc->prev_decode_only_middle == 1 ) { 411 silk_memset( &psEnc->state_Fxx[ 1 ].sShape, 0, sizeof( psEnc->state_Fxx[ 1 ].sShape ) ); 412 silk_memset( &psEnc->state_Fxx[ 1 ].sPrefilt, 0, sizeof( psEnc->state_Fxx[ 1 ].sPrefilt ) ); 413 silk_memset( &psEnc->state_Fxx[ 1 ].sCmn.sNSQ, 0, sizeof( psEnc->state_Fxx[ 1 ].sCmn.sNSQ ) ); 414 silk_memset( psEnc->state_Fxx[ 1 ].sCmn.prev_NLSFq_Q15, 0, sizeof( psEnc->state_Fxx[ 1 ].sCmn.prev_NLSFq_Q15 ) ); 415 silk_memset( &psEnc->state_Fxx[ 1 ].sCmn.sLP.In_LP_State, 0, sizeof( psEnc->state_Fxx[ 1 ].sCmn.sLP.In_LP_State ) ); 416 psEnc->state_Fxx[ 1 ].sCmn.prevLag = 100; 417 psEnc->state_Fxx[ 1 ].sCmn.sNSQ.lagPrev = 100; 418 psEnc->state_Fxx[ 1 ].sShape.LastGainIndex = 10; 419 psEnc->state_Fxx[ 1 ].sCmn.prevSignalType = TYPE_NO_VOICE_ACTIVITY; 420 psEnc->state_Fxx[ 1 ].sCmn.sNSQ.prev_gain_Q16 = 65536; 421 psEnc->state_Fxx[ 1 ].sCmn.first_frame_after_reset = 1; 422 } 423 silk_encode_do_VAD_Fxx( &psEnc->state_Fxx[ 1 ] ); 424 } else { 425 psEnc->state_Fxx[ 1 ].sCmn.VAD_flags[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ] = 0; 426 } 427 if( !prefillFlag ) { 428 silk_stereo_encode_pred( psRangeEnc, psEnc->sStereo.predIx[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ] ); 429 if( psEnc->state_Fxx[ 1 ].sCmn.VAD_flags[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ] == 0 ) { 430 silk_stereo_encode_mid_only( psRangeEnc, psEnc->sStereo.mid_only_flags[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ] ); 431 } 432 } 433 } else { 434 /* Buffering */ 435 silk_memcpy( psEnc->state_Fxx[ 0 ].sCmn.inputBuf, psEnc->sStereo.sMid, 2 * sizeof( opus_int16 ) ); 436 silk_memcpy( psEnc->sStereo.sMid, &psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.frame_length ], 2 * sizeof( opus_int16 ) ); 437 } 438 silk_encode_do_VAD_Fxx( &psEnc->state_Fxx[ 0 ] ); 439 440 /* Encode */ 441 for( n = 0; n < encControl->nChannelsInternal; n++ ) { 442 opus_int maxBits, useCBR; 443 444 /* Handling rate constraints */ 445 maxBits = encControl->maxBits; 446 if( tot_blocks == 2 && curr_block == 0 ) { 447 maxBits = maxBits * 3 / 5; 448 } else if( tot_blocks == 3 ) { 449 if( curr_block == 0 ) { 450 maxBits = maxBits * 2 / 5; 451 } else if( curr_block == 1 ) { 452 maxBits = maxBits * 3 / 4; 453 } 454 } 455 useCBR = encControl->useCBR && curr_block == tot_blocks - 1; 456 457 if( encControl->nChannelsInternal == 1 ) { 458 channelRate_bps = TargetRate_bps; 459 } else { 460 channelRate_bps = MStargetRates_bps[ n ]; 461 if( n == 0 && MStargetRates_bps[ 1 ] > 0 ) { 462 useCBR = 0; 463 /* Give mid up to 1/2 of the max bits for that frame */ 464 maxBits -= encControl->maxBits / ( tot_blocks * 2 ); 465 } 466 } 467 468 if( channelRate_bps > 0 ) { 469 opus_int condCoding; 470 471 silk_control_SNR( &psEnc->state_Fxx[ n ].sCmn, channelRate_bps ); 472 473 /* Use independent coding if no previous frame available */ 474 if( psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded - n <= 0 ) { 475 condCoding = CODE_INDEPENDENTLY; 476 } else if( n > 0 && psEnc->prev_decode_only_middle ) { 477 /* If we skipped a side frame in this packet, we don't 478 need LTP scaling; the LTP state is well-defined. */ 479 condCoding = CODE_INDEPENDENTLY_NO_LTP_SCALING; 480 } else { 481 condCoding = CODE_CONDITIONALLY; 482 } 483 if( ( ret = silk_encode_frame_Fxx( &psEnc->state_Fxx[ n ], nBytesOut, psRangeEnc, condCoding, maxBits, useCBR ) ) != 0 ) { 484 silk_assert( 0 ); 485 } 486 } 487 psEnc->state_Fxx[ n ].sCmn.controlled_since_last_payload = 0; 488 psEnc->state_Fxx[ n ].sCmn.inputBufIx = 0; 489 psEnc->state_Fxx[ n ].sCmn.nFramesEncoded++; 490 } 491 psEnc->prev_decode_only_middle = psEnc->sStereo.mid_only_flags[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded - 1 ]; 492 493 /* Insert VAD and FEC flags at beginning of bitstream */ 494 if( *nBytesOut > 0 && psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded == psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket) { 495 flags = 0; 496 for( n = 0; n < encControl->nChannelsInternal; n++ ) { 497 for( i = 0; i < psEnc->state_Fxx[ n ].sCmn.nFramesPerPacket; i++ ) { 498 flags = silk_LSHIFT( flags, 1 ); 499 flags |= psEnc->state_Fxx[ n ].sCmn.VAD_flags[ i ]; 500 } 501 flags = silk_LSHIFT( flags, 1 ); 502 flags |= psEnc->state_Fxx[ n ].sCmn.LBRR_flag; 503 } 504 if( !prefillFlag ) { 505 ec_enc_patch_initial_bits( psRangeEnc, flags, ( psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket + 1 ) * encControl->nChannelsInternal ); 506 } 507 508 /* Return zero bytes if all channels DTXed */ 509 if( psEnc->state_Fxx[ 0 ].sCmn.inDTX && ( encControl->nChannelsInternal == 1 || psEnc->state_Fxx[ 1 ].sCmn.inDTX ) ) { 510 *nBytesOut = 0; 511 } 512 513 psEnc->nBitsExceeded += *nBytesOut * 8; 514 psEnc->nBitsExceeded -= silk_DIV32_16( silk_MUL( encControl->bitRate, encControl->payloadSize_ms ), 1000 ); 515 psEnc->nBitsExceeded = silk_LIMIT( psEnc->nBitsExceeded, 0, 10000 ); 516 517 /* Update flag indicating if bandwidth switching is allowed */ 518 speech_act_thr_for_switch_Q8 = silk_SMLAWB( SILK_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ), 519 SILK_FIX_CONST( ( 1 - SPEECH_ACTIVITY_DTX_THRES ) / MAX_BANDWIDTH_SWITCH_DELAY_MS, 16 + 8 ), psEnc->timeSinceSwitchAllowed_ms ); 520 if( psEnc->state_Fxx[ 0 ].sCmn.speech_activity_Q8 < speech_act_thr_for_switch_Q8 ) { 521 psEnc->allowBandwidthSwitch = 1; 522 psEnc->timeSinceSwitchAllowed_ms = 0; 523 } else { 524 psEnc->allowBandwidthSwitch = 0; 525 psEnc->timeSinceSwitchAllowed_ms += encControl->payloadSize_ms; 526 } 527 } 528 529 if( nSamplesIn == 0 ) { 530 break; 531 } 532 } else { 533 break; 534 } 535 curr_block++; 536 } 537 538 psEnc->nPrevChannelsInternal = encControl->nChannelsInternal; 539 540 encControl->allowBandwidthSwitch = psEnc->allowBandwidthSwitch; 541 encControl->inWBmodeWithoutVariableLP = psEnc->state_Fxx[ 0 ].sCmn.fs_kHz == 16 && psEnc->state_Fxx[ 0 ].sCmn.sLP.mode == 0; 542 encControl->internalSampleRate = silk_SMULBB( psEnc->state_Fxx[ 0 ].sCmn.fs_kHz, 1000 ); 543 encControl->stereoWidth_Q14 = encControl->toMono ? 0 : psEnc->sStereo.smth_width_Q14; 544 if( prefillFlag ) { 545 encControl->payloadSize_ms = tmp_payloadSize_ms; 546 encControl->complexity = tmp_complexity; 547 for( n = 0; n < encControl->nChannelsInternal; n++ ) { 548 psEnc->state_Fxx[ n ].sCmn.controlled_since_last_payload = 0; 549 psEnc->state_Fxx[ n ].sCmn.prefillFlag = 0; 550 } 551 } 552 553 RESTORE_STACK; 554 return ret; 555 } 556 557
