FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/g726.c
Date: 2026-06-16 12:54:33
Exec Total Coverage
Lines: 157 173 90.8%
Functions: 12 13 92.3%
Branches: 84 96 87.5%
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
25 #include "config_components.h"
26
27 #include <limits.h>
28
29 #include "libavutil/channel_layout.h"
30 #include "libavutil/opt.h"
31 #include "avcodec.h"
32 #include "codec_internal.h"
33 #include "decode.h"
34 #include "encode.h"
35 #include "get_bits.h"
36 #include "put_bits.h"
37
38 /**
39 * G.726 11-bit float.
40 * G.726 Standard uses rather odd 11-bit floating point arithmetic for
41 * numerous occasions. It's a mystery to me why they did it this way
42 * instead of simply using 32-bit integer arithmetic.
43 */
44 typedef struct Float11 {
45 uint8_t sign; /**< 1 bit sign */
46 uint8_t exp; /**< 4 bits exponent */
47 uint8_t mant; /**< 6 bits mantissa */
48 } Float11;
49
50 4840880 static inline Float11* i2f(int i, Float11* f)
51 {
52 4840880 f->sign = (i < 0);
53
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 4840880 if (f->sign)
54 2394170 i = -i;
55 4840880 f->exp = av_log2_16bit(i) + !!i;
56
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 4840880 f->mant = i? (i<<6) >> f->exp : 1<<5;
57 4840880 return f;
58 }
59
60 3872704 static inline int16_t mult(Float11* f1, Float11* f2)
61 {
62 3872704 int exp = f1->exp + f2->exp;
63 3872704 int res = (((f1->mant * f2->mant) + 0x30) >> 4);
64
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 3872704 res = exp > 19 ? res << (exp - 19) : res >> (19 - exp);
65
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 3872704 return (f1->sign ^ f2->sign) ? -res : res;
66 }
67
68 3809480 static inline int sgn(int value)
69 {
70
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 3809480 return (value < 0) ? -1 : 1;
71 }
72
73 typedef struct G726Tables {
74 const int* quant; /**< quantization table */
75 const int16_t* iquant; /**< inverse quantization table */
76 const int16_t* W; /**< special table #1 ;-) */
77 const uint8_t* F; /**< special table #2 */
78 } G726Tables;
79
80 typedef struct G726Context {
81 AVClass *class;
82 G726Tables tbls; /**< static tables needed for computation */
83
84 Float11 sr[2]; /**< prev. reconstructed samples */
85 Float11 dq[6]; /**< prev. difference */
86 int a[2]; /**< second order predictor coeffs */
87 int b[6]; /**< sixth order predictor coeffs */
88 int pk[2]; /**< signs of prev. 2 sez + dq */
89
90 int ap; /**< scale factor control */
91 int yu; /**< fast scale factor */
92 int yl; /**< slow scale factor */
93 int dms; /**< short average magnitude of F[i] */
94 int dml; /**< long average magnitude of F[i] */
95 int td; /**< tone detect */
96
97 int se; /**< estimated signal for the next iteration */
98 int sez; /**< estimated second order prediction */
99 int y; /**< quantizer scaling factor for the next iteration */
100 int code_size;
101 int little_endian; /**< little-endian bitstream as used in aiff and Sun AU */
102 } G726Context;
103
104 static const int quant_tbl16[] = /**< 16kbit/s 2 bits per sample */
105 { 260, INT_MAX };
106 static const int16_t iquant_tbl16[] =
107 { 116, 365, 365, 116 };
108 static const int16_t W_tbl16[] =
109 { -22, 439, 439, -22 };
110 static const uint8_t F_tbl16[] =
111 { 0, 7, 7, 0 };
112
113 static const int quant_tbl24[] = /**< 24kbit/s 3 bits per sample */
114 { 7, 217, 330, INT_MAX };
115 static const int16_t iquant_tbl24[] =
116 { INT16_MIN, 135, 273, 373, 373, 273, 135, INT16_MIN };
117 static const int16_t W_tbl24[] =
118 { -4, 30, 137, 582, 582, 137, 30, -4 };
119 static const uint8_t F_tbl24[] =
120 { 0, 1, 2, 7, 7, 2, 1, 0 };
121
122 static const int quant_tbl32[] = /**< 32kbit/s 4 bits per sample */
123 { -125, 79, 177, 245, 299, 348, 399, INT_MAX };
124 static const int16_t iquant_tbl32[] =
125 { INT16_MIN, 4, 135, 213, 273, 323, 373, 425,
126 425, 373, 323, 273, 213, 135, 4, INT16_MIN };
127 static const int16_t W_tbl32[] =
128 { -12, 18, 41, 64, 112, 198, 355, 1122,
129 1122, 355, 198, 112, 64, 41, 18, -12};
130 static const uint8_t F_tbl32[] =
131 { 0, 0, 0, 1, 1, 1, 3, 7, 7, 3, 1, 1, 1, 0, 0, 0 };
132
133 static const int quant_tbl40[] = /**< 40kbit/s 5 bits per sample */
134 { -122, -16, 67, 138, 197, 249, 297, 338,
135 377, 412, 444, 474, 501, 527, 552, INT_MAX };
136 static const int16_t iquant_tbl40[] =
137 { INT16_MIN, -66, 28, 104, 169, 224, 274, 318,
138 358, 395, 429, 459, 488, 514, 539, 566,
139 566, 539, 514, 488, 459, 429, 395, 358,
140 318, 274, 224, 169, 104, 28, -66, INT16_MIN };
141 static const int16_t W_tbl40[] =
142 { 14, 14, 24, 39, 40, 41, 58, 100,
143 141, 179, 219, 280, 358, 440, 529, 696,
144 696, 529, 440, 358, 280, 219, 179, 141,
145 100, 58, 41, 40, 39, 24, 14, 14 };
146 static const uint8_t F_tbl40[] =
147 { 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 3, 4, 5, 6, 6,
148 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
149
150 static const G726Tables G726Tables_pool[] =
151 {{ quant_tbl16, iquant_tbl16, W_tbl16, F_tbl16 },
152 { quant_tbl24, iquant_tbl24, W_tbl24, F_tbl24 },
153 { quant_tbl32, iquant_tbl32, W_tbl32, F_tbl32 },
154 { quant_tbl40, iquant_tbl40, W_tbl40, F_tbl40 }};
155
156
157 /**
158 * Paragraph 4.2.2 page 18: Adaptive quantizer.
159 */
160 240000 static inline uint8_t quant(G726Context* c, int d)
161 {
162 int sign, exp, i, dln;
163
164 240000 sign = i = 0;
165
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 240000 if (d < 0) {
166 113409 sign = 1;
167 113409 d = -d;
168 }
169 240000 exp = av_log2_16bit(d);
170 240000 dln = ((exp<<7) + (((d<<7)>>exp)&0x7f)) - (c->y>>2);
171
172
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 800561 while (c->tbls.quant[i] < INT_MAX && c->tbls.quant[i] < dln)
173 560561 ++i;
174
175
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 240000 if (sign)
176 113409 i = ~i;
177
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 240000 if (c->code_size != 2 && i == 0) /* I'm not sure this is a good idea */
178 15949 i = 0xff;
179
180 240000 return i;
181 }
182
183 /**
184 * Paragraph 4.2.3 page 22: Inverse adaptive quantizer.
185 */
186 484088 static inline int16_t inverse_quant(G726Context* c, int i)
187 {
188 int dql, dex, dqt;
189
190 484088 dql = c->tbls.iquant[i] + (c->y >> 2);
191 484088 dex = (dql>>7) & 0xf; /* 4-bit exponent */
192 484088 dqt = (1<<7) + (dql & 0x7f); /* log2 -> linear */
193
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 484088 return (dql < 0) ? 0 : ((dqt<<dex) >> 7);
194 }
195
196 484088 static int16_t g726_decode(G726Context* c, int I)
197 {
198 int dq, re_signal, pk0, fa1, i, tr, ylint, ylfrac, thr2, al, dq0;
199 Float11 f;
200 484088 int I_sig= I >> (c->code_size - 1);
201
202 484088 dq = inverse_quant(c, I);
203
204 /* Transition detect */
205 484088 ylint = (c->yl >> 15);
206 484088 ylfrac = (c->yl >> 10) & 0x1f;
207
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 484088 thr2 = (ylint > 9) ? 0x1f << 10 : (0x20 + ylfrac) << ylint;
208
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 484088 tr= (c->td == 1 && dq > ((3*thr2)>>2));
209
210
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 484088 if (I_sig) /* get the sign */
211 260848 dq = -dq;
212 484088 re_signal = (int16_t)(c->se + dq);
213
214 /* Update second order predictor coefficient A2 and A1 */
215
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 484088 pk0 = (c->sez + dq) ? sgn(c->sez + dq) : 0;
216
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 484088 dq0 = dq ? sgn(dq) : 0;
217
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 484088 if (tr) {
218 8 c->a[0] = 0;
219 8 c->a[1] = 0;
220
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 56 for (i=0; i<6; i++)
221 48 c->b[i] = 0;
222 } else {
223 /* This is a bit crazy, but it really is +255 not +256 */
224 484080 fa1 = av_clip_intp2((-c->a[0]*c->pk[0]*pk0)>>5, 8);
225
226 484080 c->a[1] += 128*pk0*c->pk[1] + fa1 - (c->a[1]>>7);
227 484080 c->a[1] = av_clip(c->a[1], -12288, 12288);
228 484080 c->a[0] += 64*3*pk0*c->pk[0] - (c->a[0] >> 8);
229 484080 c->a[0] = av_clip(c->a[0], -(15360 - c->a[1]), 15360 - c->a[1]);
230
231
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 3388560 for (i=0; i<6; i++)
232 2904480 c->b[i] += 128*dq0*sgn(-c->dq[i].sign) - (c->b[i]>>8);
233 }
234
235 /* Update Dq and Sr and Pk */
236 484088 c->pk[1] = c->pk[0];
237
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 484088 c->pk[0] = pk0 ? pk0 : 1;
238 484088 c->sr[1] = c->sr[0];
239 484088 i2f(re_signal, &c->sr[0]);
240
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 2904528 for (i=5; i>0; i--)
241 2420440 c->dq[i] = c->dq[i-1];
242 484088 i2f(dq, &c->dq[0]);
243 484088 c->dq[0].sign = I_sig; /* Isn't it crazy ?!?! */
244
245 484088 c->td = c->a[1] < -11776;
246
247 /* Update Ap */
248 484088 c->dms += (c->tbls.F[I]<<4) + ((- c->dms) >> 5);
249 484088 c->dml += (c->tbls.F[I]<<4) + ((- c->dml) >> 7);
250
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 484088 if (tr)
251 8 c->ap = 256;
252 else {
253 484080 c->ap += (-c->ap) >> 4;
254
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 484080 if (c->y <= 1535 || c->td || abs((c->dms << 2) - c->dml) >= (c->dml >> 3))
255 354173 c->ap += 0x20;
256 }
257
258 /* Update Yu and Yl */
259 484088 c->yu = av_clip(c->y + c->tbls.W[I] + ((-c->y)>>5), 544, 5120);
260 484088 c->yl += c->yu + ((-c->yl)>>6);
261
262 /* Next iteration for Y */
263
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 484088 al = (c->ap >= 256) ? 1<<6 : c->ap >> 2;
264 484088 c->y = (c->yl + (c->yu - (c->yl>>6))*al) >> 6;
265
266 /* Next iteration for SE and SEZ */
267 484088 c->se = 0;
268
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 3388616 for (i=0; i<6; i++)
269 2904528 c->se += mult(i2f(c->b[i] >> 2, &f), &c->dq[i]);
270 484088 c->sez = c->se >> 1;
271
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 1452264 for (i=0; i<2; i++)
272 968176 c->se += mult(i2f(c->a[i] >> 2, &f), &c->sr[i]);
273 484088 c->se >>= 1;
274
275 484088 return av_clip(re_signal * 4, -0xffff, 0xffff);
276 }
277
278 15 static av_cold void g726_reset(G726Context *c)
279 {
280 int i;
281
282 15 c->tbls = G726Tables_pool[c->code_size - 2];
283
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 45 for (i=0; i<2; i++) {
284 30 c->sr[i].mant = 1<<5;
285 30 c->pk[i] = 1;
286 }
287
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 105 for (i=0; i<6; i++) {
288 90 c->dq[i].mant = 1<<5;
289 }
290 15 c->yu = 544;
291 15 c->yl = 34816;
292
293 15 c->y = 544;
294 15 }
295
296 #if CONFIG_ADPCM_G726_ENCODER || CONFIG_ADPCM_G726LE_ENCODER
297 240000 static int16_t g726_encode(G726Context* c, int16_t sig)
298 {
299 uint8_t i;
300
301 240000 i = av_zero_extend(quant(c, sig/4 - c->se), c->code_size);
302 240000 g726_decode(c, i);
303 240000 return i;
304 }
305
306 /* Interfacing to the libavcodec */
307
308 5 static av_cold int g726_encode_init(AVCodecContext *avctx)
309 {
310 5 G726Context* c = avctx->priv_data;
311
312 5 c->little_endian = !strcmp(avctx->codec->name, "g726le");
313
314
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 5 if (avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL &&
315
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 5 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
322
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 5 if (avctx->ch_layout.nb_channels != 1) {
323 ✗ av_log(avctx, AV_LOG_ERROR, "Only mono is supported\n");
324 ✗ return AVERROR(EINVAL);
325 }
326
327
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 5 if (avctx->bit_rate)
328 5 c->code_size = (avctx->bit_rate + avctx->sample_rate/2) / avctx->sample_rate;
329
330 5 c->code_size = av_clip(c->code_size, 2, 5);
331 5 avctx->bit_rate = c->code_size * avctx->sample_rate;
332 5 avctx->bits_per_coded_sample = c->code_size;
333
334 5 g726_reset(c);
335
336 /* select a frame size that will end on a byte boundary and have a size of
337 approximately 1024 bytes */
338 5 avctx->frame_size = ((int[]){ 4096, 2736, 2048, 1640 })[c->code_size - 2];
339
340 5 return 0;
341 }
342
343 108 static int g726_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
344 const AVFrame *frame, int *got_packet_ptr)
345 {
346 108 G726Context *c = avctx->priv_data;
347 108 const int16_t *samples = (const int16_t *)frame->data[0];
348 PutBitContext pb;
349 int i, ret, out_size;
350
351 108 out_size = (frame->nb_samples * c->code_size + 7) / 8;
352
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 108 if ((ret = ff_get_encode_buffer(avctx, avpkt, out_size, 0)) < 0)
353 ✗ return ret;
354 108 init_put_bits(&pb, avpkt->data, avpkt->size);
355
356
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 240108 for (i = 0; i < frame->nb_samples; i++)
357
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 240000 if (c->little_endian) {
358 48000 put_bits_le(&pb, c->code_size, g726_encode(c, *samples++));
359 } else {
360 192000 put_bits(&pb, c->code_size, g726_encode(c, *samples++));
361 }
362
363
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 108 if (c->little_endian) {
364 24 flush_put_bits_le(&pb);
365 } else {
366 84 flush_put_bits(&pb);
367 }
368
369 108 *got_packet_ptr = 1;
370 108 return 0;
371 }
372
373 #define OFFSET(x) offsetof(G726Context, x)
374 #define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
375 static const AVOption options[] = {
376 { "code_size", "Bits per code", OFFSET(code_size), AV_OPT_TYPE_INT, { .i64 = 4 }, 2, 5, AE },
377 { NULL },
378 };
379
380 static const AVClass g726_class = {
381 .class_name = "g726",
382 .item_name = av_default_item_name,
383 .option = options,
384 .version = LIBAVUTIL_VERSION_INT,
385 };
386
387 static const FFCodecDefault defaults[] = {
388 { "b", "0" },
389 { NULL },
390 };
391 #endif
392
393 #if CONFIG_ADPCM_G726_ENCODER
394 const FFCodec ff_adpcm_g726_encoder = {
395 .p.name = "g726",
396 CODEC_LONG_NAME("G.726 ADPCM"),
397 .p.type = AVMEDIA_TYPE_AUDIO,
398 .p.id = AV_CODEC_ID_ADPCM_G726,
399 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SMALL_LAST_FRAME |
400 AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
401 .priv_data_size = sizeof(G726Context),
402 .init = g726_encode_init,
403 FF_CODEC_ENCODE_CB(g726_encode_frame),
404 CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_S16),
405 .p.priv_class = &g726_class,
406 .defaults = defaults,
407 };
408 #endif
409
410 #if CONFIG_ADPCM_G726LE_ENCODER
411 const FFCodec ff_adpcm_g726le_encoder = {
412 .p.name = "g726le",
413 CODEC_LONG_NAME("G.726 little endian ADPCM (\"right-justified\")"),
414 .p.type = AVMEDIA_TYPE_AUDIO,
415 .p.id = AV_CODEC_ID_ADPCM_G726LE,
416 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SMALL_LAST_FRAME |
417 AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
418 .priv_data_size = sizeof(G726Context),
419 .init = g726_encode_init,
420 FF_CODEC_ENCODE_CB(g726_encode_frame),
421 CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_S16),
422 .p.priv_class = &g726_class,
423 .defaults = defaults,
424 };
425 #endif
426
427 #if CONFIG_ADPCM_G726_DECODER || CONFIG_ADPCM_G726LE_DECODER
428 10 static av_cold int g726_decode_init(AVCodecContext *avctx)
429 {
430 10 G726Context* c = avctx->priv_data;
431
432
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 10 if (avctx->ch_layout.nb_channels > 1){
433 ✗ avpriv_request_sample(avctx, "Decoding more than one channel");
434 ✗ return AVERROR_PATCHWELCOME;
435 }
436 10 av_channel_layout_uninit(&avctx->ch_layout);
437 10 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
438
439 10 c->little_endian = !strcmp(avctx->codec->name, "g726le");
440
441 10 c->code_size = avctx->bits_per_coded_sample;
442
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 10 if (c->code_size < 2 || c->code_size > 5) {
443 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid number of bits %d\n", c->code_size);
444 ✗ return AVERROR(EINVAL);
445 }
446 10 g726_reset(c);
447
448 10 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
449
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 10 if (!avctx->sample_rate)
450 ✗ avctx->sample_rate = 8000;
451
452 10 return 0;
453 }
454
455 405 static int g726_decode_frame(AVCodecContext *avctx, AVFrame *frame,
456 int *got_frame_ptr, AVPacket *avpkt)
457 {
458 405 const uint8_t *buf = avpkt->data;
459 405 int buf_size = avpkt->size;
460 405 G726Context *c = avctx->priv_data;
461 int16_t *samples;
462 GetBitContext gb;
463 int out_samples, ret;
464
465 405 out_samples = buf_size * 8 / c->code_size;
466
467 /* get output buffer */
468 405 frame->nb_samples = out_samples;
469
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 405 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
470 ✗ return ret;
471 405 samples = (int16_t *)frame->data[0];
472
473 405 init_get_bits(&gb, buf, buf_size * 8);
474
475
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 244493 while (out_samples--)
476
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 488176 *samples++ = g726_decode(c, c->little_endian ?
477 50040 get_bits_le(&gb, c->code_size) :
478 194048 get_bits(&gb, c->code_size));
479
480
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 405 if (get_bits_left(&gb) > 0)
481 ✗ av_log(avctx, AV_LOG_ERROR, "Frame invalidly split, missing parser?\n");
482
483 405 *got_frame_ptr = 1;
484
485 405 return buf_size;
486 }
487
488 ✗ static void g726_decode_flush(AVCodecContext *avctx)
489 {
490 ✗ G726Context *c = avctx->priv_data;
491 ✗ g726_reset(c);
492 ✗ }
493 #endif
494
495 #if CONFIG_ADPCM_G726_DECODER
496 const FFCodec ff_adpcm_g726_decoder = {
497 .p.name = "g726",
498 CODEC_LONG_NAME("G.726 ADPCM"),
499 .p.type = AVMEDIA_TYPE_AUDIO,
500 .p.id = AV_CODEC_ID_ADPCM_G726,
501 .priv_data_size = sizeof(G726Context),
502 .init = g726_decode_init,
503 FF_CODEC_DECODE_CB(g726_decode_frame),
504 .flush = g726_decode_flush,
505 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
506 };
507 #endif
508
509 #if CONFIG_ADPCM_G726LE_DECODER
510 const FFCodec ff_adpcm_g726le_decoder = {
511 .p.name = "g726le",
512 .p.type = AVMEDIA_TYPE_AUDIO,
513 .p.id = AV_CODEC_ID_ADPCM_G726LE,
514 .priv_data_size = sizeof(G726Context),
515 .init = g726_decode_init,
516 FF_CODEC_DECODE_CB(g726_decode_frame),
517 .flush = g726_decode_flush,
518 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
519 CODEC_LONG_NAME("G.726 ADPCM little-endian"),
520 };
521 #endif
522