FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
g729dec.c
Go to the documentation of this file.
1 /*
2  * G.729, G729 Annex D decoders
3  * Copyright (c) 2008 Vladimir Voroshilov
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 <inttypes.h>
23 #include <string.h>
24 
25 #include "avcodec.h"
26 #include "libavutil/avutil.h"
27 #include "get_bits.h"
28 #include "audiodsp.h"
29 #include "internal.h"
30 
31 
32 #include "g729.h"
33 #include "lsp.h"
34 #include "celp_math.h"
35 #include "celp_filters.h"
36 #include "acelp_filters.h"
37 #include "acelp_pitch_delay.h"
38 #include "acelp_vectors.h"
39 #include "g729data.h"
40 #include "g729postfilter.h"
41 
42 /**
43  * minimum quantized LSF value (3.2.4)
44  * 0.005 in Q13
45  */
46 #define LSFQ_MIN 40
47 
48 /**
49  * maximum quantized LSF value (3.2.4)
50  * 3.135 in Q13
51  */
52 #define LSFQ_MAX 25681
53 
54 /**
55  * minimum LSF distance (3.2.4)
56  * 0.0391 in Q13
57  */
58 #define LSFQ_DIFF_MIN 321
59 
60 /// interpolation filter length
61 #define INTERPOL_LEN 11
62 
63 /**
64  * minimum gain pitch value (3.8, Equation 47)
65  * 0.2 in (1.14)
66  */
67 #define SHARP_MIN 3277
68 
69 /**
70  * maximum gain pitch value (3.8, Equation 47)
71  * (EE) This does not comply with the specification.
72  * Specification says about 0.8, which should be
73  * 13107 in (1.14), but reference C code uses
74  * 13017 (equals to 0.7945) instead of it.
75  */
76 #define SHARP_MAX 13017
77 
78 /**
79  * MR_ENERGY (mean removed energy) = mean_energy + 10 * log10(2^26 * subframe_size) in (7.13)
80  */
81 #define MR_ENERGY 1018156
82 
83 #define DECISION_NOISE 0
84 #define DECISION_INTERMEDIATE 1
85 #define DECISION_VOICE 2
86 
87 typedef enum {
91 } G729Formats;
92 
93 typedef struct {
94  uint8_t ac_index_bits[2]; ///< adaptive codebook index for second subframe (size in bits)
95  uint8_t parity_bit; ///< parity bit for pitch delay
96  uint8_t gc_1st_index_bits; ///< gain codebook (first stage) index (size in bits)
97  uint8_t gc_2nd_index_bits; ///< gain codebook (second stage) index (size in bits)
98  uint8_t fc_signs_bits; ///< number of pulses in fixed-codebook vector
99  uint8_t fc_indexes_bits; ///< size (in bits) of fixed-codebook index entry
101 
102 typedef struct {
104 
105  /// past excitation signal buffer
107 
108  int16_t* exc; ///< start of past excitation data in buffer
109  int pitch_delay_int_prev; ///< integer part of previous subframe's pitch delay (4.1.3)
110 
111  /// (2.13) LSP quantizer outputs
112  int16_t past_quantizer_output_buf[MA_NP + 1][10];
113  int16_t* past_quantizer_outputs[MA_NP + 1];
114 
115  int16_t lsfq[10]; ///< (2.13) quantized LSF coefficients from previous frame
116  int16_t lsp_buf[2][10]; ///< (0.15) LSP coefficients (previous and current frames) (3.2.5)
117  int16_t *lsp[2]; ///< pointers to lsp_buf
118 
119  int16_t quant_energy[4]; ///< (5.10) past quantized energy
120 
121  /// previous speech data for LP synthesis filter
122  int16_t syn_filter_data[10];
123 
124 
125  /// residual signal buffer (used in long-term postfilter)
126  int16_t residual[SUBFRAME_SIZE + RES_PREV_DATA_SIZE];
127 
128  /// previous speech data for residual calculation filter
129  int16_t res_filter_data[SUBFRAME_SIZE+10];
130 
131  /// previous speech data for short-term postfilter
132  int16_t pos_filter_data[SUBFRAME_SIZE+10];
133 
134  /// (1.14) pitch gain of current and five previous subframes
135  int16_t past_gain_pitch[6];
136 
137  /// (14.1) gain code from current and previous subframe
138  int16_t past_gain_code[2];
139 
140  /// voice decision on previous subframe (0-noise, 1-intermediate, 2-voice), G.729D
141  int16_t voice_decision;
142 
143  int16_t onset; ///< detected onset level (0-2)
144  int16_t was_periodic; ///< whether previous frame was declared as periodic or not (4.4)
145  int16_t ht_prev_data; ///< previous data for 4.2.3, equation 86
146  int gain_coeff; ///< (1.14) gain coefficient (4.2.4)
147  uint16_t rand_value; ///< random number generator value (4.4.4)
148  int ma_predictor_prev; ///< switched MA predictor of LSP quantizer from last good frame
149 
150  /// (14.14) high-pass filter data (past input)
151  int hpf_f[2];
152 
153  /// high-pass filter data (past output)
154  int16_t hpf_z[2];
155 } G729Context;
156 
158  .ac_index_bits = {8,5},
159  .parity_bit = 1,
160  .gc_1st_index_bits = GC_1ST_IDX_BITS_8K,
161  .gc_2nd_index_bits = GC_2ND_IDX_BITS_8K,
162  .fc_signs_bits = 4,
163  .fc_indexes_bits = 13,
164 };
165 
167  .ac_index_bits = {8,4},
168  .parity_bit = 0,
169  .gc_1st_index_bits = GC_1ST_IDX_BITS_6K4,
170  .gc_2nd_index_bits = GC_2ND_IDX_BITS_6K4,
171  .fc_signs_bits = 2,
172  .fc_indexes_bits = 9,
173 };
174 
175 /**
176  * @brief pseudo random number generator
177  */
178 static inline uint16_t g729_prng(uint16_t value)
179 {
180  return 31821 * value + 13849;
181 }
182 
183 /**
184  * Get parity bit of bit 2..7
185  */
186 static inline int get_parity(uint8_t value)
187 {
188  return (0x6996966996696996ULL >> (value >> 2)) & 1;
189 }
190 
191 /**
192  * Decodes LSF (Line Spectral Frequencies) from L0-L3 (3.2.4).
193  * @param[out] lsfq (2.13) quantized LSF coefficients
194  * @param[in,out] past_quantizer_outputs (2.13) quantizer outputs from previous frames
195  * @param ma_predictor switched MA predictor of LSP quantizer
196  * @param vq_1st first stage vector of quantizer
197  * @param vq_2nd_low second stage lower vector of LSP quantizer
198  * @param vq_2nd_high second stage higher vector of LSP quantizer
199  */
200 static void lsf_decode(int16_t* lsfq, int16_t* past_quantizer_outputs[MA_NP + 1],
201  int16_t ma_predictor,
202  int16_t vq_1st, int16_t vq_2nd_low, int16_t vq_2nd_high)
203 {
204  int i,j;
205  static const uint8_t min_distance[2]={10, 5}; //(2.13)
206  int16_t* quantizer_output = past_quantizer_outputs[MA_NP];
207 
208  for (i = 0; i < 5; i++) {
209  quantizer_output[i] = cb_lsp_1st[vq_1st][i ] + cb_lsp_2nd[vq_2nd_low ][i ];
210  quantizer_output[i + 5] = cb_lsp_1st[vq_1st][i + 5] + cb_lsp_2nd[vq_2nd_high][i + 5];
211  }
212 
213  for (j = 0; j < 2; j++) {
214  for (i = 1; i < 10; i++) {
215  int diff = (quantizer_output[i - 1] - quantizer_output[i] + min_distance[j]) >> 1;
216  if (diff > 0) {
217  quantizer_output[i - 1] -= diff;
218  quantizer_output[i ] += diff;
219  }
220  }
221  }
222 
223  for (i = 0; i < 10; i++) {
224  int sum = quantizer_output[i] * cb_ma_predictor_sum[ma_predictor][i];
225  for (j = 0; j < MA_NP; j++)
226  sum += past_quantizer_outputs[j][i] * cb_ma_predictor[ma_predictor][j][i];
227 
228  lsfq[i] = sum >> 15;
229  }
230 
232 }
233 
234 /**
235  * Restores past LSP quantizer output using LSF from previous frame
236  * @param[in,out] lsfq (2.13) quantized LSF coefficients
237  * @param[in,out] past_quantizer_outputs (2.13) quantizer outputs from previous frames
238  * @param ma_predictor_prev MA predictor from previous frame
239  * @param lsfq_prev (2.13) quantized LSF coefficients from previous frame
240  */
241 static void lsf_restore_from_previous(int16_t* lsfq,
242  int16_t* past_quantizer_outputs[MA_NP + 1],
243  int ma_predictor_prev)
244 {
245  int16_t* quantizer_output = past_quantizer_outputs[MA_NP];
246  int i,k;
247 
248  for (i = 0; i < 10; i++) {
249  int tmp = lsfq[i] << 15;
250 
251  for (k = 0; k < MA_NP; k++)
252  tmp -= past_quantizer_outputs[k][i] * cb_ma_predictor[ma_predictor_prev][k][i];
253 
254  quantizer_output[i] = ((tmp >> 15) * cb_ma_predictor_sum_inv[ma_predictor_prev][i]) >> 12;
255  }
256 }
257 
258 /**
259  * Constructs new excitation signal and applies phase filter to it
260  * @param[out] out constructed speech signal
261  * @param in original excitation signal
262  * @param fc_cur (2.13) original fixed-codebook vector
263  * @param gain_code (14.1) gain code
264  * @param subframe_size length of the subframe
265  */
266 static void g729d_get_new_exc(
267  int16_t* out,
268  const int16_t* in,
269  const int16_t* fc_cur,
270  int dstate,
271  int gain_code,
272  int subframe_size)
273 {
274  int i;
275  int16_t fc_new[SUBFRAME_SIZE];
276 
277  ff_celp_convolve_circ(fc_new, fc_cur, phase_filter[dstate], subframe_size);
278 
279  for(i=0; i<subframe_size; i++)
280  {
281  out[i] = in[i];
282  out[i] -= (gain_code * fc_cur[i] + 0x2000) >> 14;
283  out[i] += (gain_code * fc_new[i] + 0x2000) >> 14;
284  }
285 }
286 
287 /**
288  * Makes decision about onset in current subframe
289  * @param past_onset decision result of previous subframe
290  * @param past_gain_code gain code of current and previous subframe
291  *
292  * @return onset decision result for current subframe
293  */
294 static int g729d_onset_decision(int past_onset, const int16_t* past_gain_code)
295 {
296  if((past_gain_code[0] >> 1) > past_gain_code[1])
297  return 2;
298  else
299  return FFMAX(past_onset-1, 0);
300 }
301 
302 /**
303  * Makes decision about voice presence in current subframe
304  * @param onset onset level
305  * @param prev_voice_decision voice decision result from previous subframe
306  * @param past_gain_pitch pitch gain of current and previous subframes
307  *
308  * @return voice decision result for current subframe
309  */
310 static int16_t g729d_voice_decision(int onset, int prev_voice_decision, const int16_t* past_gain_pitch)
311 {
312  int i, low_gain_pitch_cnt, voice_decision;
313 
314  if(past_gain_pitch[0] >= 14745) // 0.9
315  voice_decision = DECISION_VOICE;
316  else if (past_gain_pitch[0] <= 9830) // 0.6
317  voice_decision = DECISION_NOISE;
318  else
319  voice_decision = DECISION_INTERMEDIATE;
320 
321  for(i=0, low_gain_pitch_cnt=0; i<6; i++)
322  if(past_gain_pitch[i] < 9830)
323  low_gain_pitch_cnt++;
324 
325  if(low_gain_pitch_cnt > 2 && !onset)
326  voice_decision = DECISION_NOISE;
327 
328  if(!onset && voice_decision > prev_voice_decision + 1)
329  voice_decision--;
330 
331  if(onset && voice_decision < DECISION_VOICE)
332  voice_decision++;
333 
334  return voice_decision;
335 }
336 
337 static int32_t scalarproduct_int16_c(const int16_t * v1, const int16_t * v2, int order)
338 {
339  int res = 0;
340 
341  while (order--)
342  res += *v1++ * *v2++;
343 
344  return res;
345 }
346 
348 {
349  G729Context* ctx = avctx->priv_data;
350  int i,k;
351 
352  if (avctx->channels != 1) {
353  av_log(avctx, AV_LOG_ERROR, "Only mono sound is supported (requested channels: %d).\n", avctx->channels);
354  return AVERROR(EINVAL);
355  }
356  avctx->sample_fmt = AV_SAMPLE_FMT_S16;
357 
358  /* Both 8kbit/s and 6.4kbit/s modes uses two subframes per frame. */
359  avctx->frame_size = SUBFRAME_SIZE << 1;
360 
361  ctx->gain_coeff = 16384; // 1.0 in (1.14)
362 
363  for (k = 0; k < MA_NP + 1; k++) {
365  for (i = 1; i < 11; i++)
366  ctx->past_quantizer_outputs[k][i - 1] = (18717 * i) >> 3;
367  }
368 
369  ctx->lsp[0] = ctx->lsp_buf[0];
370  ctx->lsp[1] = ctx->lsp_buf[1];
371  memcpy(ctx->lsp[0], lsp_init, 10 * sizeof(int16_t));
372 
374 
376 
377  /* random seed initialization */
378  ctx->rand_value = 21845;
379 
380  /* quantized prediction error */
381  for(i=0; i<4; i++)
382  ctx->quant_energy[i] = -14336; // -14 in (5.10)
383 
384  ff_audiodsp_init(&ctx->adsp);
386 
387  return 0;
388 }
389 
390 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
391  AVPacket *avpkt)
392 {
393  const uint8_t *buf = avpkt->data;
394  int buf_size = avpkt->size;
395  int16_t *out_frame;
396  GetBitContext gb;
397  const G729FormatDescription *format;
398  int frame_erasure = 0; ///< frame erasure detected during decoding
399  int bad_pitch = 0; ///< parity check failed
400  int i;
401  int16_t *tmp;
402  G729Formats packet_type;
403  G729Context *ctx = avctx->priv_data;
404  int16_t lp[2][11]; // (3.12)
405  uint8_t ma_predictor; ///< switched MA predictor of LSP quantizer
406  uint8_t quantizer_1st; ///< first stage vector of quantizer
407  uint8_t quantizer_2nd_lo; ///< second stage lower vector of quantizer (size in bits)
408  uint8_t quantizer_2nd_hi; ///< second stage higher vector of quantizer (size in bits)
409 
410  int pitch_delay_int[2]; // pitch delay, integer part
411  int pitch_delay_3x; // pitch delay, multiplied by 3
412  int16_t fc[SUBFRAME_SIZE]; // fixed-codebook vector
413  int16_t synth[SUBFRAME_SIZE+10]; // fixed-codebook vector
414  int j, ret;
415  int gain_before, gain_after;
416  int is_periodic = 0; // whether one of the subframes is declared as periodic or not
417  AVFrame *frame = data;
418 
419  frame->nb_samples = SUBFRAME_SIZE<<1;
420  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
421  return ret;
422  out_frame = (int16_t*) frame->data[0];
423 
424  if (buf_size % 10 == 0) {
425  packet_type = FORMAT_G729_8K;
426  format = &format_g729_8k;
427  //Reset voice decision
428  ctx->onset = 0;
430  av_log(avctx, AV_LOG_DEBUG, "Packet type: %s\n", "G.729 @ 8kbit/s");
431  } else if (buf_size == 8) {
432  packet_type = FORMAT_G729D_6K4;
433  format = &format_g729d_6k4;
434  av_log(avctx, AV_LOG_DEBUG, "Packet type: %s\n", "G.729D @ 6.4kbit/s");
435  } else {
436  av_log(avctx, AV_LOG_ERROR, "Packet size %d is unknown.\n", buf_size);
437  return AVERROR_INVALIDDATA;
438  }
439 
440  for (i=0; i < buf_size; i++)
441  frame_erasure |= buf[i];
442  frame_erasure = !frame_erasure;
443 
444  init_get_bits(&gb, buf, 8*buf_size);
445 
446  ma_predictor = get_bits(&gb, 1);
447  quantizer_1st = get_bits(&gb, VQ_1ST_BITS);
448  quantizer_2nd_lo = get_bits(&gb, VQ_2ND_BITS);
449  quantizer_2nd_hi = get_bits(&gb, VQ_2ND_BITS);
450 
451  if(frame_erasure)
453  ctx->ma_predictor_prev);
454  else {
456  ma_predictor,
457  quantizer_1st, quantizer_2nd_lo, quantizer_2nd_hi);
458  ctx->ma_predictor_prev = ma_predictor;
459  }
460 
461  tmp = ctx->past_quantizer_outputs[MA_NP];
462  memmove(ctx->past_quantizer_outputs + 1, ctx->past_quantizer_outputs,
463  MA_NP * sizeof(int16_t*));
464  ctx->past_quantizer_outputs[0] = tmp;
465 
466  ff_acelp_lsf2lsp(ctx->lsp[1], ctx->lsfq, 10);
467 
468  ff_acelp_lp_decode(&lp[0][0], &lp[1][0], ctx->lsp[1], ctx->lsp[0], 10);
469 
470  FFSWAP(int16_t*, ctx->lsp[1], ctx->lsp[0]);
471 
472  for (i = 0; i < 2; i++) {
473  int gain_corr_factor;
474 
475  uint8_t ac_index; ///< adaptive codebook index
476  uint8_t pulses_signs; ///< fixed-codebook vector pulse signs
477  int fc_indexes; ///< fixed-codebook indexes
478  uint8_t gc_1st_index; ///< gain codebook (first stage) index
479  uint8_t gc_2nd_index; ///< gain codebook (second stage) index
480 
481  ac_index = get_bits(&gb, format->ac_index_bits[i]);
482  if(!i && format->parity_bit)
483  bad_pitch = get_parity(ac_index) == get_bits1(&gb);
484  fc_indexes = get_bits(&gb, format->fc_indexes_bits);
485  pulses_signs = get_bits(&gb, format->fc_signs_bits);
486  gc_1st_index = get_bits(&gb, format->gc_1st_index_bits);
487  gc_2nd_index = get_bits(&gb, format->gc_2nd_index_bits);
488 
489  if (frame_erasure)
490  pitch_delay_3x = 3 * ctx->pitch_delay_int_prev;
491  else if(!i) {
492  if (bad_pitch)
493  pitch_delay_3x = 3 * ctx->pitch_delay_int_prev;
494  else
495  pitch_delay_3x = ff_acelp_decode_8bit_to_1st_delay3(ac_index);
496  } else {
497  int pitch_delay_min = av_clip(ctx->pitch_delay_int_prev - 5,
499 
500  if(packet_type == FORMAT_G729D_6K4)
501  pitch_delay_3x = ff_acelp_decode_4bit_to_2nd_delay3(ac_index, pitch_delay_min);
502  else
503  pitch_delay_3x = ff_acelp_decode_5_6_bit_to_2nd_delay3(ac_index, pitch_delay_min);
504  }
505 
506  /* Round pitch delay to nearest (used everywhere except ff_acelp_interpolate). */
507  pitch_delay_int[i] = (pitch_delay_3x + 1) / 3;
508  if (pitch_delay_int[i] > PITCH_DELAY_MAX) {
509  av_log(avctx, AV_LOG_WARNING, "pitch_delay_int %d is too large\n", pitch_delay_int[i]);
510  pitch_delay_int[i] = PITCH_DELAY_MAX;
511  }
512 
513  if (frame_erasure) {
514  ctx->rand_value = g729_prng(ctx->rand_value);
515  fc_indexes = av_mod_uintp2(ctx->rand_value, format->fc_indexes_bits);
516 
517  ctx->rand_value = g729_prng(ctx->rand_value);
518  pulses_signs = ctx->rand_value;
519  }
520 
521 
522  memset(fc, 0, sizeof(int16_t) * SUBFRAME_SIZE);
523  switch (packet_type) {
524  case FORMAT_G729_8K:
527  fc_indexes, pulses_signs, 3, 3);
528  break;
529  case FORMAT_G729D_6K4:
532  fc_indexes, pulses_signs, 1, 4);
533  break;
534  }
535 
536  /*
537  This filter enhances harmonic components of the fixed-codebook vector to
538  improve the quality of the reconstructed speech.
539 
540  / fc_v[i], i < pitch_delay
541  fc_v[i] = <
542  \ fc_v[i] + gain_pitch * fc_v[i-pitch_delay], i >= pitch_delay
543  */
544  ff_acelp_weighted_vector_sum(fc + pitch_delay_int[i],
545  fc + pitch_delay_int[i],
546  fc, 1 << 14,
547  av_clip(ctx->past_gain_pitch[0], SHARP_MIN, SHARP_MAX),
548  0, 14,
549  SUBFRAME_SIZE - pitch_delay_int[i]);
550 
551  memmove(ctx->past_gain_pitch+1, ctx->past_gain_pitch, 5 * sizeof(int16_t));
552  ctx->past_gain_code[1] = ctx->past_gain_code[0];
553 
554  if (frame_erasure) {
555  ctx->past_gain_pitch[0] = (29491 * ctx->past_gain_pitch[0]) >> 15; // 0.90 (0.15)
556  ctx->past_gain_code[0] = ( 2007 * ctx->past_gain_code[0] ) >> 11; // 0.98 (0.11)
557 
558  gain_corr_factor = 0;
559  } else {
560  if (packet_type == FORMAT_G729D_6K4) {
561  ctx->past_gain_pitch[0] = cb_gain_1st_6k4[gc_1st_index][0] +
562  cb_gain_2nd_6k4[gc_2nd_index][0];
563  gain_corr_factor = cb_gain_1st_6k4[gc_1st_index][1] +
564  cb_gain_2nd_6k4[gc_2nd_index][1];
565 
566  /* Without check below overflow can occur in ff_acelp_update_past_gain.
567  It is not issue for G.729, because gain_corr_factor in it's case is always
568  greater than 1024, while in G.729D it can be even zero. */
569  gain_corr_factor = FFMAX(gain_corr_factor, 1024);
570 #ifndef G729_BITEXACT
571  gain_corr_factor >>= 1;
572 #endif
573  } else {
574  ctx->past_gain_pitch[0] = cb_gain_1st_8k[gc_1st_index][0] +
575  cb_gain_2nd_8k[gc_2nd_index][0];
576  gain_corr_factor = cb_gain_1st_8k[gc_1st_index][1] +
577  cb_gain_2nd_8k[gc_2nd_index][1];
578  }
579 
580  /* Decode the fixed-codebook gain. */
581  ctx->past_gain_code[0] = ff_acelp_decode_gain_code(&ctx->adsp, gain_corr_factor,
582  fc, MR_ENERGY,
583  ctx->quant_energy,
585  SUBFRAME_SIZE, 4);
586 #ifdef G729_BITEXACT
587  /*
588  This correction required to get bit-exact result with
589  reference code, because gain_corr_factor in G.729D is
590  two times larger than in original G.729.
591 
592  If bit-exact result is not issue then gain_corr_factor
593  can be simpler divided by 2 before call to g729_get_gain_code
594  instead of using correction below.
595  */
596  if (packet_type == FORMAT_G729D_6K4) {
597  gain_corr_factor >>= 1;
598  ctx->past_gain_code[0] >>= 1;
599  }
600 #endif
601  }
602  ff_acelp_update_past_gain(ctx->quant_energy, gain_corr_factor, 2, frame_erasure);
603 
604  /* Routine requires rounding to lowest. */
605  ff_acelp_interpolate(ctx->exc + i * SUBFRAME_SIZE,
606  ctx->exc + i * SUBFRAME_SIZE - pitch_delay_3x / 3,
608  (pitch_delay_3x % 3) << 1,
609  10, SUBFRAME_SIZE);
610 
611  ff_acelp_weighted_vector_sum(ctx->exc + i * SUBFRAME_SIZE,
612  ctx->exc + i * SUBFRAME_SIZE, fc,
613  (!ctx->was_periodic && frame_erasure) ? 0 : ctx->past_gain_pitch[0],
614  ( ctx->was_periodic && frame_erasure) ? 0 : ctx->past_gain_code[0],
615  1 << 13, 14, SUBFRAME_SIZE);
616 
617  memcpy(synth, ctx->syn_filter_data, 10 * sizeof(int16_t));
618 
620  synth+10,
621  &lp[i][1],
622  ctx->exc + i * SUBFRAME_SIZE,
623  SUBFRAME_SIZE,
624  10,
625  1,
626  0,
627  0x800))
628  /* Overflow occurred, downscale excitation signal... */
629  for (j = 0; j < 2 * SUBFRAME_SIZE + PITCH_DELAY_MAX + INTERPOL_LEN; j++)
630  ctx->exc_base[j] >>= 2;
631 
632  /* ... and make synthesis again. */
633  if (packet_type == FORMAT_G729D_6K4) {
634  int16_t exc_new[SUBFRAME_SIZE];
635 
636  ctx->onset = g729d_onset_decision(ctx->onset, ctx->past_gain_code);
638 
639  g729d_get_new_exc(exc_new, ctx->exc + i * SUBFRAME_SIZE, fc, ctx->voice_decision, ctx->past_gain_code[0], SUBFRAME_SIZE);
640 
642  synth+10,
643  &lp[i][1],
644  exc_new,
645  SUBFRAME_SIZE,
646  10,
647  0,
648  0,
649  0x800);
650  } else {
652  synth+10,
653  &lp[i][1],
654  ctx->exc + i * SUBFRAME_SIZE,
655  SUBFRAME_SIZE,
656  10,
657  0,
658  0,
659  0x800);
660  }
661  /* Save data (without postfilter) for use in next subframe. */
662  memcpy(ctx->syn_filter_data, synth+SUBFRAME_SIZE, 10 * sizeof(int16_t));
663 
664  /* Calculate gain of unfiltered signal for use in AGC. */
665  gain_before = 0;
666  for (j = 0; j < SUBFRAME_SIZE; j++)
667  gain_before += FFABS(synth[j+10]);
668 
669  /* Call postfilter and also update voicing decision for use in next frame. */
671  &ctx->adsp,
672  &ctx->ht_prev_data,
673  &is_periodic,
674  &lp[i][0],
675  pitch_delay_int[0],
676  ctx->residual,
677  ctx->res_filter_data,
678  ctx->pos_filter_data,
679  synth+10,
680  SUBFRAME_SIZE);
681 
682  /* Calculate gain of filtered signal for use in AGC. */
683  gain_after = 0;
684  for(j=0; j<SUBFRAME_SIZE; j++)
685  gain_after += FFABS(synth[j+10]);
686 
688  gain_before,
689  gain_after,
690  synth+10,
691  SUBFRAME_SIZE,
692  ctx->gain_coeff);
693 
694  if (frame_erasure)
696  else
697  ctx->pitch_delay_int_prev = pitch_delay_int[i];
698 
699  memcpy(synth+8, ctx->hpf_z, 2*sizeof(int16_t));
701  out_frame + i*SUBFRAME_SIZE,
702  ctx->hpf_f,
703  synth+10,
704  SUBFRAME_SIZE);
705  memcpy(ctx->hpf_z, synth+8+SUBFRAME_SIZE, 2*sizeof(int16_t));
706  }
707 
708  ctx->was_periodic = is_periodic;
709 
710  /* Save signal for use in next frame. */
711  memmove(ctx->exc_base, ctx->exc_base + 2 * SUBFRAME_SIZE, (PITCH_DELAY_MAX+INTERPOL_LEN)*sizeof(int16_t));
712 
713  *got_frame_ptr = 1;
714  return packet_type == FORMAT_G729_8K ? 10 : 8;
715 }
716 
718  .name = "g729",
719  .long_name = NULL_IF_CONFIG_SMALL("G.729"),
720  .type = AVMEDIA_TYPE_AUDIO,
721  .id = AV_CODEC_ID_G729,
722  .priv_data_size = sizeof(G729Context),
723  .init = decoder_init,
724  .decode = decode_frame,
725  .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
726 };