FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/g726.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 155 174 89.1%
Branches: 81 96 84.4%

Line Branch Exec Source
1 /*
2 * G.726 ADPCM audio codec
3 * Copyright (c) 2004 Roman Shaposhnik
4 *
5 * This is a very straightforward rendition of the G.726
6 * Section 4 "Computational Details".
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24 #include <limits.h>
25
26 #include "libavutil/channel_layout.h"
27 #include "libavutil/opt.h"
28 #include "avcodec.h"
29 #include "encode.h"
30 #include "internal.h"
31 #include "get_bits.h"
32 #include "put_bits.h"
33
34 /**
35 * G.726 11-bit float.
36 * G.726 Standard uses rather odd 11-bit floating point arithmetic for
37 * numerous occasions. It's a mystery to me why they did it this way
38 * instead of simply using 32-bit integer arithmetic.
39 */
40 typedef struct Float11 {
41 uint8_t sign; /**< 1 bit sign */
42 uint8_t exp; /**< 4 bits exponent */
43 uint8_t mant; /**< 6 bits mantissa */
44 } Float11;
45
46 4260480 static inline Float11* i2f(int i, Float11* f)
47 {
48 4260480 f->sign = (i < 0);
49
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4260480 if (f->sign)
50 2123959 i = -i;
51 4260480 f->exp = av_log2_16bit(i) + !!i;
52
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4260480 f->mant = i? (i<<6) >> f->exp : 1<<5;
53 4260480 return f;
54 }
55
56 3408384 static inline int16_t mult(Float11* f1, Float11* f2)
57 {
58 int res, exp;
59
60 3408384 exp = f1->exp + f2->exp;
61 3408384 res = (((f1->mant * f2->mant) + 0x30) >> 4);
62
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3408384 res = exp > 19 ? res << (exp - 19) : res >> (19 - exp);
63
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3408384 return (f1->sign ^ f2->sign) ? -res : res;
64 }
65
66 3355070 static inline int sgn(int value)
67 {
68
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3355070 return (value < 0) ? -1 : 1;
69 }
70
71 typedef struct G726Tables {
72 const int* quant; /**< quantization table */
73 const int16_t* iquant; /**< inverse quantization table */
74 const int16_t* W; /**< special table #1 ;-) */
75 const uint8_t* F; /**< special table #2 */
76 } G726Tables;
77
78 typedef struct G726Context {
79 AVClass *class;
80 G726Tables tbls; /**< static tables needed for computation */
81
82 Float11 sr[2]; /**< prev. reconstructed samples */
83 Float11 dq[6]; /**< prev. difference */
84 int a[2]; /**< second order predictor coeffs */
85 int b[6]; /**< sixth order predictor coeffs */
86 int pk[2]; /**< signs of prev. 2 sez + dq */
87
88 int ap; /**< scale factor control */
89 int yu; /**< fast scale factor */
90 int yl; /**< slow scale factor */
91 int dms; /**< short average magnitude of F[i] */
92 int dml; /**< long average magnitude of F[i] */
93 int td; /**< tone detect */
94
95 int se; /**< estimated signal for the next iteration */
96 int sez; /**< estimated second order prediction */
97 int y; /**< quantizer scaling factor for the next iteration */
98 int code_size;
99 int little_endian; /**< little-endian bitstream as used in aiff and Sun AU */
100 } G726Context;
101
102 static const int quant_tbl16[] = /**< 16kbit/s 2 bits per sample */
103 { 260, INT_MAX };
104 static const int16_t iquant_tbl16[] =
105 { 116, 365, 365, 116 };
106 static const int16_t W_tbl16[] =
107 { -22, 439, 439, -22 };
108 static const uint8_t F_tbl16[] =
109 { 0, 7, 7, 0 };
110
111 static const int quant_tbl24[] = /**< 24kbit/s 3 bits per sample */
112 { 7, 217, 330, INT_MAX };
113 static const int16_t iquant_tbl24[] =
114 { INT16_MIN, 135, 273, 373, 373, 273, 135, INT16_MIN };
115 static const int16_t W_tbl24[] =
116 { -4, 30, 137, 582, 582, 137, 30, -4 };
117 static const uint8_t F_tbl24[] =
118 { 0, 1, 2, 7, 7, 2, 1, 0 };
119
120 static const int quant_tbl32[] = /**< 32kbit/s 4 bits per sample */
121 { -125, 79, 177, 245, 299, 348, 399, INT_MAX };
122 static const int16_t iquant_tbl32[] =
123 { INT16_MIN, 4, 135, 213, 273, 323, 373, 425,
124 425, 373, 323, 273, 213, 135, 4, INT16_MIN };
125 static const int16_t W_tbl32[] =
126 { -12, 18, 41, 64, 112, 198, 355, 1122,
127 1122, 355, 198, 112, 64, 41, 18, -12};
128 static const uint8_t F_tbl32[] =
129 { 0, 0, 0, 1, 1, 1, 3, 7, 7, 3, 1, 1, 1, 0, 0, 0 };
130
131 static const int quant_tbl40[] = /**< 40kbit/s 5 bits per sample */
132 { -122, -16, 67, 138, 197, 249, 297, 338,
133 377, 412, 444, 474, 501, 527, 552, INT_MAX };
134 static const int16_t iquant_tbl40[] =
135 { INT16_MIN, -66, 28, 104, 169, 224, 274, 318,
136 358, 395, 429, 459, 488, 514, 539, 566,
137 566, 539, 514, 488, 459, 429, 395, 358,
138 318, 274, 224, 169, 104, 28, -66, INT16_MIN };
139 static const int16_t W_tbl40[] =
140 { 14, 14, 24, 39, 40, 41, 58, 100,
141 141, 179, 219, 280, 358, 440, 529, 696,
142 696, 529, 440, 358, 280, 219, 179, 141,
143 100, 58, 41, 40, 39, 24, 14, 14 };
144 static const uint8_t F_tbl40[] =
145 { 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 3, 4, 5, 6, 6,
146 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
147
148 static const G726Tables G726Tables_pool[] =
149 {{ quant_tbl16, iquant_tbl16, W_tbl16, F_tbl16 },
150 { quant_tbl24, iquant_tbl24, W_tbl24, F_tbl24 },
151 { quant_tbl32, iquant_tbl32, W_tbl32, F_tbl32 },
152 { quant_tbl40, iquant_tbl40, W_tbl40, F_tbl40 }};
153
154
155 /**
156 * Paragraph 4.2.2 page 18: Adaptive quantizer.
157 */
158 192000 static inline uint8_t quant(G726Context* c, int d)
159 {
160 int sign, exp, i, dln;
161
162 192000 sign = i = 0;
163
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192000 if (d < 0) {
164 91006 sign = 1;
165 91006 d = -d;
166 }
167 192000 exp = av_log2_16bit(d);
168 192000 dln = ((exp<<7) + (((d<<7)>>exp)&0x7f)) - (c->y>>2);
169
170
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628554 while (c->tbls.quant[i] < INT_MAX && c->tbls.quant[i] < dln)
171 436554 ++i;
172
173
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192000 if (sign)
174 91006 i = ~i;
175
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192000 if (c->code_size != 2 && i == 0) /* I'm not sure this is a good idea */
176 12505 i = 0xff;
177
178 192000 return i;
179 }
180
181 /**
182 * Paragraph 4.2.3 page 22: Inverse adaptive quantizer.
183 */
184 426048 static inline int16_t inverse_quant(G726Context* c, int i)
185 {
186 int dql, dex, dqt;
187
188 426048 dql = c->tbls.iquant[i] + (c->y >> 2);
189 426048 dex = (dql>>7) & 0xf; /* 4-bit exponent */
190 426048 dqt = (1<<7) + (dql & 0x7f); /* log2 -> linear */
191
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426048 return (dql < 0) ? 0 : ((dqt<<dex) >> 7);
192 }
193
194 426048 static int16_t g726_decode(G726Context* c, int I)
195 {
196 int dq, re_signal, pk0, fa1, i, tr, ylint, ylfrac, thr2, al, dq0;
197 Float11 f;
198 426048 int I_sig= I >> (c->code_size - 1);
199
200 426048 dq = inverse_quant(c, I);
201
202 /* Transition detect */
203 426048 ylint = (c->yl >> 15);
204 426048 ylfrac = (c->yl >> 10) & 0x1f;
205
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426048 thr2 = (ylint > 9) ? 0x1f << 10 : (0x20 + ylfrac) << ylint;
206
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426048 tr= (c->td == 1 && dq > ((3*thr2)>>2));
207
208
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426048 if (I_sig) /* get the sign */
209 227337 dq = -dq;
210 426048 re_signal = (int16_t)(c->se + dq);
211
212 /* Update second order predictor coefficient A2 and A1 */
213
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426048 pk0 = (c->sez + dq) ? sgn(c->sez + dq) : 0;
214
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426048 dq0 = dq ? sgn(dq) : 0;
215
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426048 if (tr) {
216 7 c->a[0] = 0;
217 7 c->a[1] = 0;
218
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49 for (i=0; i<6; i++)
219 42 c->b[i] = 0;
220 } else {
221 /* This is a bit crazy, but it really is +255 not +256 */
222 426041 fa1 = av_clip_intp2((-c->a[0]*c->pk[0]*pk0)>>5, 8);
223
224 426041 c->a[1] += 128*pk0*c->pk[1] + fa1 - (c->a[1]>>7);
225 426041 c->a[1] = av_clip(c->a[1], -12288, 12288);
226 426041 c->a[0] += 64*3*pk0*c->pk[0] - (c->a[0] >> 8);
227 426041 c->a[0] = av_clip(c->a[0], -(15360 - c->a[1]), 15360 - c->a[1]);
228
229
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2982287 for (i=0; i<6; i++)
230 2556246 c->b[i] += 128*dq0*sgn(-c->dq[i].sign) - (c->b[i]>>8);
231 }
232
233 /* Update Dq and Sr and Pk */
234 426048 c->pk[1] = c->pk[0];
235
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426048 c->pk[0] = pk0 ? pk0 : 1;
236 426048 c->sr[1] = c->sr[0];
237 426048 i2f(re_signal, &c->sr[0]);
238
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2556288 for (i=5; i>0; i--)
239 2130240 c->dq[i] = c->dq[i-1];
240 426048 i2f(dq, &c->dq[0]);
241 426048 c->dq[0].sign = I_sig; /* Isn't it crazy ?!?! */
242
243 426048 c->td = c->a[1] < -11776;
244
245 /* Update Ap */
246 426048 c->dms += (c->tbls.F[I]<<4) + ((- c->dms) >> 5);
247 426048 c->dml += (c->tbls.F[I]<<4) + ((- c->dml) >> 7);
248
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426048 if (tr)
249 7 c->ap = 256;
250 else {
251 426041 c->ap += (-c->ap) >> 4;
252
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426041 if (c->y <= 1535 || c->td || abs((c->dms << 2) - c->dml) >= (c->dml >> 3))
253 304888 c->ap += 0x20;
254 }
255
256 /* Update Yu and Yl */
257 426048 c->yu = av_clip(c->y + c->tbls.W[I] + ((-c->y)>>5), 544, 5120);
258 426048 c->yl += c->yu + ((-c->yl)>>6);
259
260 /* Next iteration for Y */
261
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426048 al = (c->ap >= 256) ? 1<<6 : c->ap >> 2;
262 426048 c->y = (c->yl + (c->yu - (c->yl>>6))*al) >> 6;
263
264 /* Next iteration for SE and SEZ */
265 426048 c->se = 0;
266
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2982336 for (i=0; i<6; i++)
267 2556288 c->se += mult(i2f(c->b[i] >> 2, &f), &c->dq[i]);
268 426048 c->sez = c->se >> 1;
269
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1278144 for (i=0; i<2; i++)
270 852096 c->se += mult(i2f(c->a[i] >> 2, &f), &c->sr[i]);
271 426048 c->se >>= 1;
272
273 426048 return av_clip(re_signal * 4, -0xffff, 0xffff);
274 }
275
276 12 static av_cold int g726_reset(G726Context *c)
277 {
278 int i;
279
280 12 c->tbls = G726Tables_pool[c->code_size - 2];
281
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36 for (i=0; i<2; i++) {
282 24 c->sr[i].mant = 1<<5;
283 24 c->pk[i] = 1;
284 }
285
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84 for (i=0; i<6; i++) {
286 72 c->dq[i].mant = 1<<5;
287 }
288 12 c->yu = 544;
289 12 c->yl = 34816;
290
291 12 c->y = 544;
292
293 12 return 0;
294 }
295
296 #if CONFIG_ADPCM_G726_ENCODER || CONFIG_ADPCM_G726LE_ENCODER
297 192000 static int16_t g726_encode(G726Context* c, int16_t sig)
298 {
299 uint8_t i;
300
301 192000 i = av_mod_uintp2(quant(c, sig/4 - c->se), c->code_size);
302 192000 g726_decode(c, i);
303 192000 return i;
304 }
305
306 /* Interfacing to the libavcodec */
307
308 4 static av_cold int g726_encode_init(AVCodecContext *avctx)
309 {
310 4 G726Context* c = avctx->priv_data;
311
312 4 c->little_endian = !strcmp(avctx->codec->name, "g726le");
313
314
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4 if (avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL &&
315
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4 avctx->sample_rate != 8000) {
316 av_log(avctx, AV_LOG_ERROR, "Sample rates other than 8kHz are not "
317 "allowed when the compliance level is higher than unofficial. "
318 "Resample or reduce the compliance level.\n");
319 return AVERROR(EINVAL);
320 }
321
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4 if (avctx->sample_rate <= 0) {
322 av_log(avctx, AV_LOG_ERROR, "Invalid sample rate %d\n",
323 avctx->sample_rate);
324 return AVERROR(EINVAL);
325 }
326
327
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4 if(avctx->channels != 1){
328 av_log(avctx, AV_LOG_ERROR, "Only mono is supported\n");
329 return AVERROR(EINVAL);
330 }
331
332
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4 if (avctx->bit_rate)
333 4 c->code_size = (avctx->bit_rate + avctx->sample_rate/2) / avctx->sample_rate;
334
335 4 c->code_size = av_clip(c->code_size, 2, 5);
336 4 avctx->bit_rate = c->code_size * avctx->sample_rate;
337 4 avctx->bits_per_coded_sample = c->code_size;
338
339 4 g726_reset(c);
340
341 /* select a frame size that will end on a byte boundary and have a size of
342 approximately 1024 bytes */
343 4 avctx->frame_size = ((int[]){ 4096, 2736, 2048, 1640 })[c->code_size - 2];
344
345 4 return 0;
346 }
347
348 84 static int g726_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
349 const AVFrame *frame, int *got_packet_ptr)
350 {
351 84 G726Context *c = avctx->priv_data;
352 84 const int16_t *samples = (const int16_t *)frame->data[0];
353 PutBitContext pb;
354 int i, ret, out_size;
355
356 84 out_size = (frame->nb_samples * c->code_size + 7) / 8;
357
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84 if ((ret = ff_get_encode_buffer(avctx, avpkt, out_size, 0)) < 0)
358 return ret;
359 84 init_put_bits(&pb, avpkt->data, avpkt->size);
360
361
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192084 for (i = 0; i < frame->nb_samples; i++)
362
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192000 if (c->little_endian) {
363 put_bits_le(&pb, c->code_size, g726_encode(c, *samples++));
364 } else {
365 192000 put_bits(&pb, c->code_size, g726_encode(c, *samples++));
366 }
367
368
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84 if (c->little_endian) {
369 flush_put_bits_le(&pb);
370 } else {
371 84 flush_put_bits(&pb);
372 }
373
374 84 *got_packet_ptr = 1;
375 84 return 0;
376 }
377
378 #define OFFSET(x) offsetof(G726Context, x)
379 #define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
380 static const AVOption options[] = {
381 { "code_size", "Bits per code", OFFSET(code_size), AV_OPT_TYPE_INT, { .i64 = 4 }, 2, 5, AE },
382 { NULL },
383 };
384
385 static const AVClass g726_class = {
386 .class_name = "g726",
387 .item_name = av_default_item_name,
388 .option = options,
389 .version = LIBAVUTIL_VERSION_INT,
390 };
391
392 static const AVCodecDefault defaults[] = {
393 { "b", "0" },
394 { NULL },
395 };
396 #endif
397
398 #if CONFIG_ADPCM_G726_ENCODER
399 const AVCodec ff_adpcm_g726_encoder = {
400 .name = "g726",
401 .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM"),
402 .type = AVMEDIA_TYPE_AUDIO,
403 .id = AV_CODEC_ID_ADPCM_G726,
404 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SMALL_LAST_FRAME,
405 .priv_data_size = sizeof(G726Context),
406 .init = g726_encode_init,
407 .encode2 = g726_encode_frame,
408 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
409 AV_SAMPLE_FMT_NONE },
410 .priv_class = &g726_class,
411 .defaults = defaults,
412 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
413 };
414 #endif
415
416 #if CONFIG_ADPCM_G726LE_ENCODER
417 const AVCodec ff_adpcm_g726le_encoder = {
418 .name = "g726le",
419 .long_name = NULL_IF_CONFIG_SMALL("G.726 little endian ADPCM (\"right-justified\")"),
420 .type = AVMEDIA_TYPE_AUDIO,
421 .id = AV_CODEC_ID_ADPCM_G726LE,
422 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SMALL_LAST_FRAME,
423 .priv_data_size = sizeof(G726Context),
424 .init = g726_encode_init,
425 .encode2 = g726_encode_frame,
426 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
427 AV_SAMPLE_FMT_NONE },
428 .priv_class = &g726_class,
429 .defaults = defaults,
430 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
431 };
432 #endif
433
434 #if CONFIG_ADPCM_G726_DECODER || CONFIG_ADPCM_G726LE_DECODER
435 8 static av_cold int g726_decode_init(AVCodecContext *avctx)
436 {
437 8 G726Context* c = avctx->priv_data;
438
439
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8 if(avctx->channels > 1){
440 avpriv_request_sample(avctx, "Decoding more than one channel");
441 return AVERROR_PATCHWELCOME;
442 }
443 8 avctx->channels = 1;
444 8 avctx->channel_layout = AV_CH_LAYOUT_MONO;
445
446 8 c->little_endian = !strcmp(avctx->codec->name, "g726le");
447
448 8 c->code_size = avctx->bits_per_coded_sample;
449
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8 if (c->code_size < 2 || c->code_size > 5) {
450 av_log(avctx, AV_LOG_ERROR, "Invalid number of bits %d\n", c->code_size);
451 return AVERROR(EINVAL);
452 }
453 8 g726_reset(c);
454
455 8 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
456
457 8 return 0;
458 }
459
460 26 static int g726_decode_frame(AVCodecContext *avctx, void *data,
461 int *got_frame_ptr, AVPacket *avpkt)
462 {
463 26 AVFrame *frame = data;
464 26 const uint8_t *buf = avpkt->data;
465 26 int buf_size = avpkt->size;
466 26 G726Context *c = avctx->priv_data;
467 int16_t *samples;
468 GetBitContext gb;
469 int out_samples, ret;
470
471 26 out_samples = buf_size * 8 / c->code_size;
472
473 /* get output buffer */
474 26 frame->nb_samples = out_samples;
475
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26 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
476 return ret;
477 26 samples = (int16_t *)frame->data[0];
478
479 26 init_get_bits(&gb, buf, buf_size * 8);
480
481
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234074 while (out_samples--)
482
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468096 *samples++ = g726_decode(c, c->little_endian ?
483 get_bits_le(&gb, c->code_size) :
484 234048 get_bits(&gb, c->code_size));
485
486
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26 if (get_bits_left(&gb) > 0)
487 av_log(avctx, AV_LOG_ERROR, "Frame invalidly split, missing parser?\n");
488
489 26 *got_frame_ptr = 1;
490
491 26 return buf_size;
492 }
493
494 static void g726_decode_flush(AVCodecContext *avctx)
495 {
496 G726Context *c = avctx->priv_data;
497 g726_reset(c);
498 }
499 #endif
500
501 #if CONFIG_ADPCM_G726_DECODER
502 const AVCodec ff_adpcm_g726_decoder = {
503 .name = "g726",
504 .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM"),
505 .type = AVMEDIA_TYPE_AUDIO,
506 .id = AV_CODEC_ID_ADPCM_G726,
507 .priv_data_size = sizeof(G726Context),
508 .init = g726_decode_init,
509 .decode = g726_decode_frame,
510 .flush = g726_decode_flush,
511 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
512 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
513 };
514 #endif
515
516 #if CONFIG_ADPCM_G726LE_DECODER
517 const AVCodec ff_adpcm_g726le_decoder = {
518 .name = "g726le",
519 .type = AVMEDIA_TYPE_AUDIO,
520 .id = AV_CODEC_ID_ADPCM_G726LE,
521 .priv_data_size = sizeof(G726Context),
522 .init = g726_decode_init,
523 .decode = g726_decode_frame,
524 .flush = g726_decode_flush,
525 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
526 .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM little-endian"),
527 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
528 };
529 #endif
530