1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
|
/***********************************************************************
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, (subject to the limitations in the disclaimer below)
are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of Skype Limited, nor the names of specific
contributors, may be used to endorse or promote products derived from
this software without specific prior written permission.
NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/
#include "SKP_Silk_main_FIX.h"
#include "SKP_Silk_tuning_parameters.h"
/****************/
/* Encode frame */
/****************/
SKP_int SKP_Silk_encode_frame_FIX(
SKP_Silk_encoder_state_FIX *psEnc, /* I/O Encoder state FIX */
SKP_int32 *pnBytesOut, /* O Number of payload bytes */
ec_enc *psRangeEnc /* I/O compressor data structure */
)
{
SKP_Silk_encoder_control_FIX sEncCtrl;
SKP_int ret = 0;
SKP_int16 *x_frame, *res_pitch_frame;
SKP_int16 xfw[ MAX_FRAME_LENGTH ];
SKP_int16 res_pitch[ 2 * MAX_FRAME_LENGTH + LA_PITCH_MAX ];
TIC(ENCODE_FRAME)
psEnc->sCmn.indices.Seed = psEnc->sCmn.frameCounter++ & 3;
/**************************************************************/
/* Setup Input Pointers, and insert frame in input buffer */
/*************************************************************/
/* pointers aligned with start of frame to encode */
x_frame = psEnc->x_buf + psEnc->sCmn.ltp_mem_length; /* start of frame to encode */
res_pitch_frame = res_pitch + psEnc->sCmn.ltp_mem_length; /* start of pitch LPC residual frame */
/****************************/
/* Voice Activity Detection */
/****************************/
TIC(VAD)
ret = SKP_Silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf );
TOC(VAD)
/**************************************************/
/* Convert speech activity into VAD and DTX flags */
/**************************************************/
if( psEnc->sCmn.nFramesAnalyzed == 0 ) {
psEnc->sCmn.inDTX = psEnc->sCmn.useDTX;
}
if( psEnc->sCmn.speech_activity_Q8 < SKP_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ) ) {
psEnc->sCmn.indices.signalType = TYPE_NO_VOICE_ACTIVITY;
psEnc->sCmn.noSpeechCounter++;
if( psEnc->sCmn.noSpeechCounter < NB_SPEECH_FRAMES_BEFORE_DTX ) {
psEnc->sCmn.inDTX = 0;
} else if( psEnc->sCmn.noSpeechCounter > MAX_CONSECUTIVE_DTX + NB_SPEECH_FRAMES_BEFORE_DTX ) {
psEnc->sCmn.noSpeechCounter = NB_SPEECH_FRAMES_BEFORE_DTX;
psEnc->sCmn.inDTX = 0;
}
psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesAnalyzed ] = 0;
} else {
psEnc->sCmn.noSpeechCounter = 0;
psEnc->sCmn.inDTX = 0;
psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesAnalyzed ] = 1;
}
/*******************************************/
/* High-pass filtering of the input signal */
/*******************************************/
TIC(HP_IN)
SKP_Silk_HP_variable_cutoff( &psEnc->sCmn, x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.inputBuf, psEnc->sCmn.frame_length );
TOC(HP_IN)
/* Ensure smooth bandwidth transitions */
SKP_Silk_LP_variable_cutoff( &psEnc->sCmn.sLP, x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.frame_length );
/*****************************************/
/* Find pitch lags, initial LPC analysis */
/*****************************************/
TIC(FIND_PITCH)
SKP_Silk_find_pitch_lags_FIX( psEnc, &sEncCtrl, res_pitch, x_frame );
TOC(FIND_PITCH)
/************************/
/* Noise shape analysis */
/************************/
TIC(NOISE_SHAPE_ANALYSIS)
SKP_Silk_noise_shape_analysis_FIX( psEnc, &sEncCtrl, res_pitch_frame, x_frame );
TOC(NOISE_SHAPE_ANALYSIS)
/*****************************************/
/* Prefiltering for noise shaper */
/*****************************************/
TIC(PREFILTER)
SKP_Silk_prefilter_FIX( psEnc, &sEncCtrl, xfw, x_frame );
TOC(PREFILTER)
/***************************************************/
/* Find linear prediction coefficients (LPC + LTP) */
/***************************************************/
TIC(FIND_PRED_COEF)
SKP_Silk_find_pred_coefs_FIX( psEnc, &sEncCtrl, res_pitch, x_frame );
TOC(FIND_PRED_COEF)
/****************************************/
/* Process gains */
/****************************************/
TIC(PROCESS_GAINS)
SKP_Silk_process_gains_FIX( psEnc, &sEncCtrl );
TOC(PROCESS_GAINS)
/****************************************/
/* Low Bitrate Redundant Encoding */
/****************************************/
TIC(LBRR)
SKP_Silk_LBRR_encode_FIX( psEnc, &sEncCtrl, xfw );
TOC(LBRR)
/*****************************************/
/* Noise shaping quantization */
/*****************************************/
TIC(NSQ)
if( psEnc->sCmn.nStatesDelayedDecision > 1 || psEnc->sCmn.warping_Q16 > 0 ) {
SKP_Silk_NSQ_del_dec( &psEnc->sCmn, &psEnc->sCmn.sNSQ, &psEnc->sCmn.indices, xfw, psEnc->sCmn.pulses,
sEncCtrl.PredCoef_Q12[ 0 ], sEncCtrl.LTPCoef_Q14, sEncCtrl.AR2_Q13, sEncCtrl.HarmShapeGain_Q14,
sEncCtrl.Tilt_Q14, sEncCtrl.LF_shp_Q14, sEncCtrl.Gains_Q16, sEncCtrl.pitchL, sEncCtrl.Lambda_Q10, sEncCtrl.LTP_scale_Q14 );
} else {
SKP_Silk_NSQ( &psEnc->sCmn, &psEnc->sCmn.sNSQ, &psEnc->sCmn.indices, xfw, psEnc->sCmn.pulses,
sEncCtrl.PredCoef_Q12[ 0 ], sEncCtrl.LTPCoef_Q14, sEncCtrl.AR2_Q13, sEncCtrl.HarmShapeGain_Q14,
sEncCtrl.Tilt_Q14, sEncCtrl.LF_shp_Q14, sEncCtrl.Gains_Q16, sEncCtrl.pitchL, sEncCtrl.Lambda_Q10, sEncCtrl.LTP_scale_Q14 );
}
TOC(NSQ)
/* Update input buffer */
SKP_memmove( psEnc->x_buf, &psEnc->x_buf[ psEnc->sCmn.frame_length ],
( psEnc->sCmn.ltp_mem_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz ) * sizeof( SKP_int16 ) );
/* Parameters needed for next frame */
psEnc->sCmn.prevLag = sEncCtrl.pitchL[ psEnc->sCmn.nb_subfr - 1 ];
psEnc->sCmn.prevSignalType = psEnc->sCmn.indices.signalType;
/* Exit without entropy coding */
if( psEnc->sCmn.prefillFlag ) {
/* No payload */
*pnBytesOut = 0;
return ret;
}
/****************************************/
/* Encode Parameters */
/****************************************/
TIC(ENCODE_PARAMS)
SKP_Silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesAnalyzed, 0 );
TOC(ENCODE_PARAMS)
/****************************************/
/* Encode Excitation Signal */
/****************************************/
TIC(ENCODE_PULSES)
SKP_Silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType,
psEnc->sCmn.pulses, psEnc->sCmn.frame_length );
TOC(ENCODE_PULSES)
/****************************************/
/* Finalize payload */
/****************************************/
psEnc->sCmn.first_frame_after_reset = 0;
if( ++psEnc->sCmn.nFramesAnalyzed >= psEnc->sCmn.nFramesPerPacket ) {
/* Payload size */
*pnBytesOut = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
/* Reset the number of frames in payload buffer */
psEnc->sCmn.nFramesAnalyzed = 0;
} else {
/* No payload this time */
*pnBytesOut = 0;
}
TOC(ENCODE_FRAME)
#ifdef SAVE_ALL_INTERNAL_DATA
{
SKP_float tmp[ MAX_NB_SUBFR * LTP_ORDER ];
int i;
DEBUG_STORE_DATA( xf.dat, x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.frame_length * sizeof( SKP_int16 ) );
DEBUG_STORE_DATA( xfw.dat, xfw, psEnc->sCmn.frame_length * sizeof( SKP_int16 ) );
DEBUG_STORE_DATA( pitchL.dat, sEncCtrl.pitchL, psEnc->sCmn.nb_subfr * sizeof( SKP_int ) );
for( i = 0; i < psEnc->sCmn.nb_subfr * LTP_ORDER; i++ ) {
tmp[ i ] = (SKP_float)sEncCtrl.LTPCoef_Q14[ i ] / 16384.0f;
}
DEBUG_STORE_DATA( pitchG_quantized.dat, tmp, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( SKP_float ) );
for( i = 0; i <psEnc->sCmn.predictLPCOrder; i++ ) {
tmp[ i ] = (SKP_float)sEncCtrl.PredCoef_Q12[ 1 ][ i ] / 4096.0f;
}
DEBUG_STORE_DATA( PredCoef.dat, tmp, psEnc->sCmn.predictLPCOrder * sizeof( SKP_float ) );
tmp[ 0 ] = (SKP_float)sEncCtrl.LTPredCodGain_Q7 / 128.0f;
DEBUG_STORE_DATA( LTPredCodGain.dat, tmp, sizeof( SKP_float ) );
tmp[ 0 ] = (SKP_float)psEnc->LTPCorr_Q15 / 32768.0f;
DEBUG_STORE_DATA( LTPcorr.dat, tmp, sizeof( SKP_float ) );
tmp[ 0 ] = (SKP_float)psEnc->sCmn.input_tilt_Q15 / 32768.0f;
DEBUG_STORE_DATA( tilt.dat, tmp, sizeof( SKP_float ) );
for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
tmp[ i ] = (SKP_float)sEncCtrl.Gains_Q16[ i ] / 65536.0f;
}
DEBUG_STORE_DATA( gains.dat, tmp, psEnc->sCmn.nb_subfr * sizeof( SKP_float ) );
DEBUG_STORE_DATA( gains_indices.dat, &psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr * sizeof( SKP_int ) );
tmp[ 0 ] = (SKP_float)sEncCtrl.current_SNR_dB_Q7 / 128.0f;
DEBUG_STORE_DATA( current_SNR_db.dat, tmp, sizeof( SKP_float ) );
DEBUG_STORE_DATA( quantOffsetType.dat, &psEnc->sCmn.indices.quantOffsetType, sizeof( SKP_int ) );
tmp[ 0 ] = (SKP_float)psEnc->sCmn.speech_activity_Q8 / 256.0f;
DEBUG_STORE_DATA( speech_activity.dat, tmp, sizeof( SKP_float ) );
for( i = 0; i < VAD_N_BANDS; i++ ) {
tmp[ i ] = (SKP_float)psEnc->sCmn.input_quality_bands_Q15[ i ] / 32768.0f;
}
DEBUG_STORE_DATA( input_quality_bands.dat, tmp, VAD_N_BANDS * sizeof( SKP_float ) );
DEBUG_STORE_DATA( signalType.dat, &psEnc->sCmn.indices.signalType, sizeof( SKP_int8) );
DEBUG_STORE_DATA( lag_index.dat, &psEnc->sCmn.indices.lagIndex, sizeof( SKP_int16 ) );
DEBUG_STORE_DATA( contour_index.dat, &psEnc->sCmn.indices.contourIndex, sizeof( SKP_int8 ) );
DEBUG_STORE_DATA( per_index.dat, &psEnc->sCmn.indices.PERIndex, sizeof( SKP_int8) );
}
#endif
return ret;
}
/* Low-Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode excitation at lower bitrate */
void SKP_Silk_LBRR_encode_FIX(
SKP_Silk_encoder_state_FIX *psEnc, /* I/O Pointer to Silk FIX encoder state */
SKP_Silk_encoder_control_FIX *psEncCtrl, /* I/O Pointer to Silk FIX encoder control struct */
const SKP_int16 xfw[] /* I Input signal */
)
{
SKP_int32 TempGains_Q16[ MAX_NB_SUBFR ];
SideInfoIndices *psIndices_LBRR = &psEnc->sCmn.indices_LBRR[ psEnc->sCmn.nFramesAnalyzed ];
SKP_Silk_nsq_state sNSQ_LBRR;
/*******************************************/
/* Control use of inband LBRR */
/*******************************************/
if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.speech_activity_Q8 > SKP_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) {
psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesAnalyzed ] = 1;
/* Copy noise shaping quantizer state and quantization indices from regular encoding */
SKP_memcpy( &sNSQ_LBRR, &psEnc->sCmn.sNSQ, sizeof( SKP_Silk_nsq_state ) );
SKP_memcpy( psIndices_LBRR, &psEnc->sCmn.indices, sizeof( SideInfoIndices ) );
/* Save original gains */
SKP_memcpy( TempGains_Q16, psEncCtrl->Gains_Q16, psEnc->sCmn.nb_subfr * sizeof( SKP_int32 ) );
if( psEnc->sCmn.nFramesAnalyzed == 0 || psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesAnalyzed - 1 ] == 0 ) {
/* First frame in packet or previous frame not LBRR coded */
psEnc->sCmn.LBRRprevLastGainIndex = psEnc->sShape.LastGainIndex;
/* Increase Gains to get target LBRR rate */
psIndices_LBRR->GainsIndices[ 0 ] = psIndices_LBRR->GainsIndices[ 0 ] + psEnc->sCmn.LBRR_GainIncreases;
psIndices_LBRR->GainsIndices[ 0 ] = SKP_min_int( psIndices_LBRR->GainsIndices[ 0 ], N_LEVELS_QGAIN - 1 );
}
/* Decode to get gains in sync with decoder */
/* Overwrite unquantized gains with quantized gains */
SKP_Silk_gains_dequant( psEncCtrl->Gains_Q16, psIndices_LBRR->GainsIndices,
&psEnc->sCmn.LBRRprevLastGainIndex, psEnc->sCmn.nFramesAnalyzed, psEnc->sCmn.nb_subfr );
/*****************************************/
/* Noise shaping quantization */
/*****************************************/
if( psEnc->sCmn.nStatesDelayedDecision > 1 || psEnc->sCmn.warping_Q16 > 0 ) {
SKP_Silk_NSQ_del_dec( &psEnc->sCmn, &sNSQ_LBRR, psIndices_LBRR, xfw,
psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesAnalyzed ], psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->LTPCoef_Q14,
psEncCtrl->AR2_Q13, psEncCtrl->HarmShapeGain_Q14, psEncCtrl->Tilt_Q14, psEncCtrl->LF_shp_Q14,
psEncCtrl->Gains_Q16, psEncCtrl->pitchL, psEncCtrl->Lambda_Q10, psEncCtrl->LTP_scale_Q14 );
} else {
SKP_Silk_NSQ( &psEnc->sCmn, &sNSQ_LBRR, psIndices_LBRR, xfw,
psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesAnalyzed ], psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->LTPCoef_Q14,
psEncCtrl->AR2_Q13, psEncCtrl->HarmShapeGain_Q14, psEncCtrl->Tilt_Q14, psEncCtrl->LF_shp_Q14,
psEncCtrl->Gains_Q16, psEncCtrl->pitchL, psEncCtrl->Lambda_Q10, psEncCtrl->LTP_scale_Q14 );
}
/* Restore original gains */
SKP_memcpy( psEncCtrl->Gains_Q16, TempGains_Q16, psEnc->sCmn.nb_subfr * sizeof( SKP_int32 ) );
}
}
|
