FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/aacenc.c
Date: 2026-10-18 19:22:45
Exec Total Coverage
Lines: 860 915 94.0%
Functions: 31 31 100.0%
Branches: 653 806 81.0%
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1 /*
2 * AAC encoder
3 * Copyright (C) 2008 Konstantin Shishkov
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 /**
23 * @file
24 * AAC encoder
25 */
26
27 /***********************************
28 * TODOs:
29 * add sane pulse detection
30 ***********************************/
31 #include <float.h>
32 #include <math.h>
33
34 #include "libavutil/channel_layout.h"
35 #include "libavutil/crc.h"
36 #include "libavutil/float_dsp.h"
37 #include "libavutil/mem.h"
38 #include "libavutil/opt.h"
39 #include "avcodec.h"
40 #include "codec_internal.h"
41 #include "encode.h"
42 #include "put_bits.h"
43 #include "mpeg4audio.h"
44 #include "sinewin.h"
45 #include "profiles.h"
46 #include "version.h"
47
48 #include "aac.h"
49 #include "aactab.h"
50 #include "aacenc.h"
51 #include "aacenctab.h"
52 #include "aacenc_utils.h"
53
54 #include "psymodel.h"
55
56 /**
57 * List of PCE (Program Configuration Element) for the channel layouts listed
58 * in channel_layout.h
59 *
60 * For those wishing in the future to add other layouts:
61 *
62 * - num_ele: number of elements in each group of front, side, back, lfe channels
63 * (an element is of type SCE (single channel), CPE (channel pair) for
64 * the first 3 groups; and is LFE for LFE group).
65 *
66 * - pairing: 0 for an SCE element or 1 for a CPE; does not apply to LFE group
67 *
68 * - index: there are three independent indices for SCE, CPE and LFE;
69 * they are incremented irrespective of the group to which the element belongs;
70 * they are not reset when going from one group to another
71 *
72 * Example: for 7.0 channel layout,
73 * .pairing = { { 1, 0 }, { 1 }, { 1 }, }, (3 CPE and 1 SCE in front group)
74 * .index = { { 0, 0 }, { 1 }, { 2 }, },
75 * (index is 0 for the single SCE but goes from 0 to 2 for the CPEs)
76 *
77 * The index order impacts the channel ordering. But is otherwise arbitrary
78 * (the sequence could have been 2, 0, 1 instead of 0, 1, 2).
79 *
80 * Spec allows for discontinuous indices, e.g. if one has a total of two SCE,
81 * SCE.0 SCE.15 is OK per spec; BUT it won't be decoded by our AAC decoder
82 * which at this time requires that indices fully cover some range starting
83 * from 0 (SCE.1 SCE.0 is OK but not SCE.0 SCE.15).
84 *
85 * - height: 0 for a base layer element, 1 for a top layer element, 2 for a bottom
86 * layer element.
87 *
88 * - config_map: total number of elements and their types. Beware, the way the
89 * types are ordered impacts the final channel ordering.
90 *
91 * - reorder_map: reorders the channels.
92 *
93 */
94 static const AACPCEInfo aac_pce_configs[] = {
95 {
96 .layout = AV_CHANNEL_LAYOUT_MONO,
97 .num_ele = { 1, 0, 0, 0 },
98 .pairing = { { 0 }, },
99 .index = { { 0 }, },
100 .config_map = { 1, TYPE_SCE, },
101 .reorder_map = { 0 },
102 },
103 {
104 .layout = AV_CHANNEL_LAYOUT_STEREO,
105 .num_ele = { 1, 0, 0, 0 },
106 .pairing = { { 1 }, },
107 .index = { { 0 }, },
108 .config_map = { 1, TYPE_CPE, },
109 .reorder_map = { 0, 1 },
110 },
111 {
112 .layout = AV_CHANNEL_LAYOUT_2POINT1,
113 .num_ele = { 1, 0, 0, 1 },
114 .pairing = { { 1 }, },
115 .index = { { 0 },{ 0 },{ 0 },{ 0 } },
116 .config_map = { 2, TYPE_CPE, TYPE_LFE },
117 .reorder_map = { 0, 1, 2 },
118 },
119 {
120 .layout = AV_CHANNEL_LAYOUT_2_1,
121 .num_ele = { 1, 0, 1, 0 },
122 .pairing = { { 1 },{ 0 },{ 0 } },
123 .index = { { 0 },{ 0 },{ 0 }, },
124 .config_map = { 2, TYPE_CPE, TYPE_SCE },
125 .reorder_map = { 0, 1, 2 },
126 },
127 {
128 .layout = AV_CHANNEL_LAYOUT_SURROUND,
129 .num_ele = { 2, 0, 0, 0 },
130 .pairing = { { 0, 1 }, },
131 .index = { { 0, 0 }, },
132 .config_map = { 2, TYPE_SCE, TYPE_CPE },
133 .reorder_map = { 2, 0, 1 },
134 },
135 {
136 .layout = AV_CHANNEL_LAYOUT_3POINT1,
137 .num_ele = { 2, 0, 0, 1 },
138 .pairing = { { 0, 1 }, },
139 .index = { { 0, 0 }, { 0 }, { 0 }, { 0 }, },
140 .config_map = { 3, TYPE_SCE, TYPE_CPE, TYPE_LFE },
141 .reorder_map = { 2, 0, 1, 3 },
142 },
143 {
144 .layout = AV_CHANNEL_LAYOUT_4POINT0,
145 .num_ele = { 2, 0, 1, 0 },
146 .pairing = { { 0, 1 }, { 0 }, { 0 }, },
147 .index = { { 0, 0 }, { 0 }, { 1 } },
148 .config_map = { 3, TYPE_SCE, TYPE_CPE, TYPE_SCE },
149 .reorder_map = { 2, 0, 1, 3 },
150 },
151 {
152 .layout = AV_CHANNEL_LAYOUT_4POINT1,
153 .num_ele = { 2, 0, 1, 1 },
154 .pairing = { { 0, 1 }, { 0 }, { 0 }, },
155 .index = { { 0, 0 }, { 0 }, { 1 }, { 0 } },
156 .config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_SCE, TYPE_LFE },
157 .reorder_map = { 2, 0, 1, 4, 3 },
158 },
159 {
160 .layout = AV_CHANNEL_LAYOUT_2_2,
161 .num_ele = { 1, 0, 1, 0 },
162 .pairing = { { 1 }, { 0 }, { 1 }, },
163 .index = { { 0 }, { 0 }, { 1 } },
164 .config_map = { 2, TYPE_CPE, TYPE_CPE },
165 .reorder_map = { 0, 1, 2, 3 },
166 },
167 {
168 .layout = AV_CHANNEL_LAYOUT_QUAD,
169 .num_ele = { 1, 0, 1, 0 },
170 .pairing = { { 1 }, { 0 }, { 1 }, },
171 .index = { { 0 }, { 0 }, { 1 } },
172 .config_map = { 2, TYPE_CPE, TYPE_CPE },
173 .reorder_map = { 0, 1, 2, 3 },
174 },
175 {
176 .layout = AV_CHANNEL_LAYOUT_5POINT0,
177 .num_ele = { 2, 0, 1, 0 },
178 .pairing = { { 0, 1 }, { 0 }, { 1 } },
179 .index = { { 0, 0 }, { 0 }, { 1 } },
180 .config_map = { 3, TYPE_SCE, TYPE_CPE, TYPE_CPE },
181 .reorder_map = { 2, 0, 1, 3, 4 },
182 },
183 {
184 .layout = AV_CHANNEL_LAYOUT_5POINT1,
185 .num_ele = { 2, 0, 1, 1 },
186 .pairing = { { 0, 1 }, { 0 }, { 1 }, },
187 .index = { { 0, 0 }, { 0 }, { 1 }, { 0 } },
188 .config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE },
189 .reorder_map = { 2, 0, 1, 4, 5, 3 },
190 },
191 {
192 .layout = AV_CHANNEL_LAYOUT_5POINT0_BACK,
193 .num_ele = { 2, 0, 1, 0 },
194 .pairing = { { 0, 1 }, { 0 }, { 1 } },
195 .index = { { 0, 0 }, { 0 }, { 1 } },
196 .config_map = { 3, TYPE_SCE, TYPE_CPE, TYPE_CPE },
197 .reorder_map = { 2, 0, 1, 3, 4 },
198 },
199 {
200 .layout = AV_CHANNEL_LAYOUT_5POINT1_BACK,
201 .num_ele = { 2, 0, 1, 1 },
202 .pairing = { { 0, 1 }, { 0 }, { 1 }, },
203 .index = { { 0, 0 }, { 0 }, { 1 }, { 0 } },
204 .config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE },
205 .reorder_map = { 2, 0, 1, 4, 5, 3 },
206 },
207 {
208 .layout = AV_CHANNEL_LAYOUT_6POINT0,
209 .num_ele = { 2, 0, 2, 0 },
210 .pairing = { { 0, 1 }, { 0 }, { 1, 0 } },
211 .index = { { 0, 0 }, { 0 }, { 1, 1 } },
212 .config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_SCE },
213 .reorder_map = { 2, 0, 1, 4, 5, 3 },
214 },
215 {
216 .layout = AV_CHANNEL_LAYOUT_6POINT0_FRONT,
217 .num_ele = { 2, 0, 1, 0 },
218 .pairing = { { 1, 1 }, { 0 }, { 1 } },
219 .index = { { 0, 1 }, { 0 }, { 2 }, },
220 .config_map = { 3, TYPE_CPE, TYPE_CPE, TYPE_CPE, },
221 .reorder_map = { 2, 3, 0, 1, 4, 5 },
222 },
223 {
224 .layout = AV_CHANNEL_LAYOUT_HEXAGONAL,
225 .num_ele = { 2, 0, 2, 0 },
226 .pairing = { { 0, 1 }, { 0 }, { 1, 0 } },
227 .index = { { 0, 0 }, { 0 }, { 1, 1 } },
228 .config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_SCE },
229 .reorder_map = { 2, 0, 1, 3, 4, 5 },
230 },
231 {
232 .layout = AV_CHANNEL_LAYOUT_6POINT1,
233 .num_ele = { 2, 0, 2, 1 },
234 .pairing = { { 0, 1 }, { 0 }, { 1, 0 }, },
235 .index = { { 0, 0 }, { 0 }, { 1, 1 }, { 0 } },
236 .config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_SCE, TYPE_LFE },
237 .reorder_map = { 2, 0, 1, 5, 6, 4, 3 },
238 },
239 {
240 .layout = AV_CHANNEL_LAYOUT_6POINT1_BACK,
241 .num_ele = { 2, 0, 2, 1 },
242 .pairing = { { 0, 1 },{ 0 },{ 1, 0 }, },
243 .index = { { 0, 0 },{ 0 },{ 1, 1 },{ 0 } },
244 .config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_SCE, TYPE_LFE },
245 .reorder_map = { 2, 0, 1, 4, 5, 6, 3 },
246 },
247 {
248 .layout = AV_CHANNEL_LAYOUT_6POINT1_FRONT,
249 .num_ele = { 2, 0, 1, 1 },
250 .pairing = { { 1, 1 }, { 0 }, { 1 }, },
251 .index = { { 0, 1 }, { 0 }, { 2 }, { 0 }, },
252 .config_map = { 4, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE, },
253 .reorder_map = { 3, 4, 0, 1, 5, 6, 2 },
254 },
255 {
256 .layout = AV_CHANNEL_LAYOUT_7POINT0,
257 .num_ele = { 2, 0, 2, 0 },
258 .pairing = { { 0, 1 }, { 0 }, { 1, 1 }, },
259 .index = { { 0, 0 }, { 0 }, { 2, 1 }, },
260 .config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE },
261 .reorder_map = { 2, 0, 1, 3, 4, 5, 6 },
262 },
263 {
264 .layout = AV_CHANNEL_LAYOUT_7POINT0_FRONT,
265 .num_ele = { 3, 0, 1, 0 },
266 .pairing = { { 0, 1, 1 }, { 0 }, { 1 }, },
267 .index = { { 0, 0, 1 }, { 0 }, { 2 }, },
268 .config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE },
269 .reorder_map = { 2, 3, 4, 0, 1, 5, 6 },
270 },
271 {
272 .layout = AV_CHANNEL_LAYOUT_7POINT1,
273 .num_ele = { 2, 0, 2, 1 },
274 .pairing = { { 0, 1 }, { 0 }, { 1, 1 }, },
275 .index = { { 0, 0 }, { 0 }, { 2, 1 }, { 0 } },
276 .config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE },
277 .reorder_map = { 2, 0, 1, 4, 5, 6, 7, 3 },
278 },
279 {
280 .layout = AV_CHANNEL_LAYOUT_7POINT1_WIDE,
281 .num_ele = { 3, 0, 1, 1 },
282 .pairing = { { 0, 1, 1 }, { 0 }, { 1 }, },
283 .index = { { 0, 0, 1 }, { 0 }, { 2 }, { 0 }, },
284 .config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE },
285 .reorder_map = { 2, 4, 5, 0, 1, 6, 7, 3 },
286 },
287 {
288 .layout = AV_CHANNEL_LAYOUT_7POINT1_WIDE_BACK,
289 .num_ele = { 3, 0, 1, 1 },
290 .pairing = { { 0, 1, 1 }, { 0 }, { 1 } },
291 .index = { { 0, 0, 1 }, { 0 }, { 2 }, { 0 } },
292 .config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE },
293 .reorder_map = { 2, 6, 7, 0, 1, 4, 5, 3 },
294 },
295 {
296 .layout = AV_CHANNEL_LAYOUT_OCTAGONAL,
297 .num_ele = { 2, 0, 3, 0 },
298 .pairing = { { 0, 1 }, { 0 }, { 1, 1, 0 }, },
299 .index = { { 0, 0 }, { 0 }, { 1, 2, 1 }, },
300 .config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_SCE },
301 .reorder_map = { 2, 0, 1, 6, 7, 3, 4, 5 },
302 },
303 {
304 .layout = AV_CHANNEL_LAYOUT_5POINT1POINT2,
305 .num_ele = { 3, 0, 1, 1 },
306 .pairing = { { 0, 1, 1 }, { 0 }, { 1 }, },
307 .index = { { 0, 0, 2 }, { 0 }, { 1 }, { 0 }, },
308 .height = { { 0, 0, 1 }, { 0 }, { 0 } },
309 .config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE, TYPE_CPE },
310 .reorder_map = { 2, 0, 1, 4, 5, 3, 6, 7 },
311 },
312 {
313 // ITU-R BS.2051-3 Sound System C
314 .layout = AV_CHANNEL_LAYOUT_5POINT1POINT2_BACK,
315 .num_ele = { 3, 0, 1, 1 },
316 .pairing = { { 0, 1, 1 }, { 0 }, { 1 }, },
317 .index = { { 0, 0, 2 }, { 0 }, { 1 }, { 0 }, },
318 .height = { { 0, 0, 1 }, { 0 }, { 0 } },
319 .config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE, TYPE_CPE },
320 .reorder_map = { 2, 0, 1, 4, 5, 3, 6, 7 },
321 },
322 {
323 .layout = AV_CHANNEL_LAYOUT_5POINT1POINT4,
324 .num_ele = { 3, 0, 2, 1 },
325 .pairing = { { 0, 1, 1 }, { 0 }, { 1, 1 }, },
326 .index = { { 0, 0, 2 }, { 0 }, { 1, 3 }, { 0 }, },
327 .height = { { 0, 0, 1 }, { 0 }, { 0, 1 } },
328 .config_map = { 6, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE, TYPE_CPE, TYPE_CPE },
329 .reorder_map = { 2, 0, 1, 4, 5, 3, 6, 7, 8, 9 },
330 },
331 // ITU-R BS.2051-3 Sound System D
332 {
333 .layout = {
334 .nb_channels = 10,
335 .order = AV_CHANNEL_ORDER_NATIVE,
336 .u.mask = AV_CH_LAYOUT_5POINT1POINT2_BACK | AV_CH_TOP_BACK_LEFT | AV_CH_TOP_BACK_RIGHT,
337 },
338 .num_ele = { 3, 0, 2, 1 },
339 .pairing = { { 0, 1, 1 }, { 0 }, { 1, 1 }, },
340 .index = { { 0, 0, 2 }, { 0 }, { 1, 3 }, { 0 }, },
341 .height = { { 0, 0, 1 }, { 0 }, { 0, 1 } },
342 .config_map = { 6, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE, TYPE_CPE, TYPE_CPE },
343 .reorder_map = { 2, 0, 1, 4, 5, 3, 6, 7, 8, 9 },
344 },
345 {
346 // ITU-R BS.2051-3 Sound System E
347 .layout = {
348 .nb_channels = 11,
349 .order = AV_CHANNEL_ORDER_NATIVE,
350 .u.mask = AV_CH_LAYOUT_5POINT1POINT4 | AV_CH_BOTTOM_FRONT_CENTER,
351 },
352 .num_ele = { 4, 0, 2, 1 },
353 .pairing = { { 0, 1, 1, 0 }, { 0 }, { 1, 1 }, },
354 .index = { { 0, 0, 2, 1 }, { 0 }, { 1, 3 }, { 0 }, },
355 .height = { { 0, 0, 1, 2 }, { 0 }, { 0, 1 } },
356 .config_map = { 7, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE, TYPE_CPE, TYPE_CPE, TYPE_SCE },
357 .reorder_map = { 2, 0, 1, 4, 5, 3, 6, 7, 8, 9, 10 },
358 },
359 {
360 .layout = AV_CHANNEL_LAYOUT_5POINT1POINT6,
361 .num_ele = { 4, 1, 2, 1 },
362 .pairing = { { 0, 1, 0, 1 }, { 0 }, { 1, 1 }, },
363 .index = { { 0, 0, 1, 2 }, { 2 }, { 1, 3 }, { 0 }, },
364 .height = { { 0, 0, 1, 1 }, { 1 }, { 0, 1 } },
365 .config_map = { 8, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE, TYPE_SCE, TYPE_CPE, TYPE_SCE, TYPE_CPE },
366 .reorder_map = { 2, 0, 1, 4, 5, 3, 8, 7, 9, 6, 10, 11 },
367 },
368 {
369 .layout = {
370 .nb_channels = 12,
371 .order = AV_CHANNEL_ORDER_NATIVE,
372 .u.mask = AV_CH_LAYOUT_5POINT1POINT2_BACK | AV_CH_TOP_BACK_LEFT | AV_CH_TOP_BACK_RIGHT |
373 AV_CH_TOP_CENTER | AV_CH_TOP_FRONT_CENTER,
374 },
375 .num_ele = { 4, 1, 2, 1 },
376 .pairing = { { 0, 1, 0, 1 }, { 0 }, { 1, 1 }, },
377 .index = { { 0, 0, 1, 2 }, { 2 }, { 1, 3 }, { 0 }, },
378 .height = { { 0, 0, 1, 1 }, { 1 }, { 0, 1 } },
379 .config_map = { 8, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE, TYPE_SCE, TYPE_CPE, TYPE_SCE, TYPE_CPE },
380 .reorder_map = { 2, 0, 1, 4, 5, 3, 8, 7, 9, 6, 10, 11 },
381 },
382 {
383 .layout = AV_CHANNEL_LAYOUT_7POINT1POINT2,
384 .num_ele = { 3, 0, 2, 1 },
385 .pairing = { { 0, 1, 1 }, { 0 }, { 1, 1 }, },
386 .index = { { 0, 0, 3 }, { 0 }, { 2, 1 }, { 0 } },
387 .height = { { 0, 0, 1 }, { 0 }, { 0, 0 } },
388 .config_map = { 6, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE, TYPE_CPE },
389 .reorder_map = { 2, 0, 1, 4, 5, 6, 7, 3, 8, 9 },
390 },
391 {
392 // ITU-R BS.2051-3 Sound System F
393 .layout = AV_CHANNEL_LAYOUT_7POINT2POINT3,
394 .num_ele = { 3, 0, 3, 2 },
395 .pairing = { { 0, 1, 1 }, { 0 }, { 1, 1, 0 }, },
396 .index = { { 0, 0, 3 }, { 0 }, { 2, 1, 1 }, { 0, 1 } },
397 .height = { { 0, 0, 1 }, { 0 }, { 0, 0, 1 } },
398 .config_map = { 8, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE, TYPE_LFE, TYPE_CPE, TYPE_SCE },
399 .reorder_map = { 2, 0, 1, 4, 5, 6, 7, 3, 11, 8, 9, 10 },
400 },
401 {
402 // ITU-R BS.2051-3 Sound System J
403 .layout = AV_CHANNEL_LAYOUT_7POINT1POINT4,
404 .num_ele = { 3, 0, 3, 1 },
405 .pairing = { { 0, 1, 1 }, { 0 }, { 1, 1, 1 }, },
406 .index = { { 0, 0, 3 }, { 0 }, { 2, 1, 4 }, { 0 } },
407 .height = { { 0, 0, 1 }, { 0 }, { 0, 0, 1 } },
408 .config_map = { 7, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE, TYPE_CPE, TYPE_CPE },
409 .reorder_map = { 2, 0, 1, 4, 5, 6, 7, 3, 8, 9, 10, 11 },
410 },
411 {
412 .layout = AV_CHANNEL_LAYOUT_7POINT1POINT6,
413 .num_ele = { 4, 1, 3, 1 },
414 .pairing = { { 0, 1, 0, 1 }, { 0 }, { 1, 1, 1 }, },
415 .index = { { 0, 0, 1, 3 }, { 2 }, { 2, 1, 4 }, { 0 } },
416 .height = { { 0, 0, 1, 1 }, { 1 }, { 0, 0, 1 } },
417 .config_map = { 9, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE, TYPE_SCE, TYPE_CPE, TYPE_SCE, TYPE_CPE },
418 .reorder_map = { 2, 0, 1, 4, 5, 6, 7, 3, 10, 9, 11, 8, 12, 13 },
419 },
420 {
421 // ITU-R BS.2051-3 Sound System G
422 .layout = AV_CHANNEL_LAYOUT_9POINT1POINT4,
423 .num_ele = { 4, 0, 3, 1 },
424 .pairing = { { 0, 1, 1, 1 }, { 0 }, { 1, 1, 1 }, },
425 .index = { { 0, 0, 1, 4 }, { 0 }, { 2, 3, 5 }, { 0 } },
426 .height = { { 0, 0, 0, 1 }, { 0 }, { 0, 0, 1 } },
427 .config_map = { 8, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE, TYPE_CPE, TYPE_CPE },
428 .reorder_map = { 2, 6, 7, 0, 1, 8, 9, 4, 5, 3, 10, 11, 12, 13 },
429 },
430 {
431 .layout = AV_CHANNEL_LAYOUT_9POINT1POINT6,
432 .num_ele = { 4, 1, 3, 1 },
433 .pairing = { { 0, 1, 1, 1 }, { 1 }, { 1, 1, 1 }, },
434 .index = { { 0, 0, 1, 4 }, { 5 }, { 2, 3, 6 }, { 0 } },
435 .height = { { 0, 0, 0, 1 }, { 1 }, { 0, 0, 1 } },
436 .config_map = { 9, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE, TYPE_CPE, TYPE_CPE, TYPE_CPE },
437 .reorder_map = { 2, 6, 7, 0, 1, 8, 9, 4, 5, 3, 10, 11, 14, 15, 12, 13 },
438 },
439 {
440 .layout = AV_CHANNEL_LAYOUT_AMBISONIC_FIRST_ORDER,
441 .num_ele = { 1, 0, 1, 0 },
442 .pairing = { { 1 }, { 0 }, { 1 }, },
443 .index = { { 0 }, { 0 }, { 1 } },
444 .config_map = { 2, TYPE_CPE, TYPE_CPE },
445 .reorder_map = { 0, 1, 2, 3 },
446 },
447 {
448 .layout = { .order = AV_CHANNEL_ORDER_AMBISONIC, .nb_channels = 9 },
449 .num_ele = { 3, 0, 2, 0 },
450 .pairing = { { 0, 1, 1 }, { 0 }, { 1, 1 }, },
451 .index = { { 0, 0, 1 }, { 0 }, { 2, 3 }, },
452 .config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_CPE },
453 .reorder_map = { 2, 5, 6, 0, 1, 7, 8, 3, 4 },
454 },
455 {
456 .layout = { .order = AV_CHANNEL_ORDER_AMBISONIC, .nb_channels = 16 },
457 .num_ele = { 4, 0, 4, 0 },
458 .pairing = { { 1, 1, 1, 1 }, { 0 }, { 1, 1, 1, 1 }, },
459 .index = { { 0, 1, 2, 3 }, { 0 }, { 4, 5, 6, 7 }, },
460 .config_map = { 8, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_CPE },
461 .reorder_map = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
462 },
463 };
464
465 9 static void put_pce(PutBitContext *pb, AVCodecContext *avctx)
466 {
467 int i, j;
468 9 AACEncContext *s = avctx->priv_data;
469 9 AACPCEInfo *pce = &s->pce;
470 9 const int bitexact = avctx->flags & AV_CODEC_FLAG_BITEXACT;
471
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 9 const char *aux_data = bitexact ? "Lavc" : LIBAVCODEC_IDENT;
472
473 9 put_bits(pb, 4, 0);
474
475 9 put_bits(pb, 2, avctx->profile);
476 9 put_bits(pb, 4, s->samplerate_index);
477
478 9 put_bits(pb, 4, pce->num_ele[0]); /* Front */
479 9 put_bits(pb, 4, pce->num_ele[1]); /* Side */
480 9 put_bits(pb, 4, pce->num_ele[2]); /* Back */
481 9 put_bits(pb, 2, pce->num_ele[3]); /* LFE */
482 9 put_bits(pb, 3, 0); /* Assoc data */
483 9 put_bits(pb, 4, 0); /* CCs */
484
485 9 put_bits(pb, 1, 0); /* Stereo mixdown */
486 9 put_bits(pb, 1, 0); /* Mono mixdown */
487 9 put_bits(pb, 1, 0); /* Something else */
488
489
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 45 for (i = 0; i < 4; i++) {
490
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 102 for (j = 0; j < pce->num_ele[i]; j++) {
491
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 66 if (i < 3)
492 56 put_bits(pb, 1, pce->pairing[i][j]);
493 66 put_bits(pb, 4, pce->index[i][j]);
494 }
495 }
496
497 9 align_put_bits(pb);
498
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 9 if (s->needs_height_ext) {
499 9 const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_8_ATM);
500 PutBitContext height_pb;
501 uint8_t buf[16];
502 9 int bits = 8 + pce->num_ele[0] * 2 + pce->num_ele[1] * 2 + pce->num_ele[2] * 2;
503 9 int bytes = (bits + 7) / 8;
504
505 9 init_put_bits(&height_pb, buf, bytes);
506 9 put_bits(&height_pb, 8, 0xAC);
507
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 36 for (i = 0; i < 3; i++)
508
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 83 for (j = 0; j < pce->num_ele[i]; j++)
509 56 put_bits(&height_pb, 2, pce->height[i][j]);
510 9 flush_put_bits(&height_pb);
511
512 9 put_bits(pb, 8, bytes + 1);
513 9 ff_copy_bits(pb, buf, bits);
514 9 align_put_bits(pb);
515 9 put_bits(pb, 8, av_crc(crc_ctx, 0xFF, buf, bytes));
516 } else {
517 ✗ put_bits(pb, 8, strlen(aux_data));
518 ✗ ff_put_string(pb, aux_data, 0);
519 }
520 9 }
521
522 /**
523 * Make AAC audio config object.
524 * @see 1.6.2.1 "Syntax - AudioSpecificConfig"
525 */
526 27 static int put_audio_specific_config(AVCodecContext *avctx, int chcfg)
527 {
528 PutBitContext pb;
529 27 AACEncContext *s = avctx->priv_data;
530 27 const int max_size = 32;
531
532 27 avctx->extradata = av_mallocz(max_size);
533
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 27 if (!avctx->extradata)
534 ✗ return AVERROR(ENOMEM);
535
536 27 init_put_bits(&pb, avctx->extradata, max_size);
537 27 put_bits(&pb, 5, s->profile+1); //profile
538 27 put_bits(&pb, 4, s->samplerate_index); //sample rate index
539 27 put_bits(&pb, 4, chcfg);
540 //GASpecificConfig
541 27 put_bits(&pb, 1, 0); //frame length - 1024 samples
542 27 put_bits(&pb, 1, 0); //does not depend on core coder
543 27 put_bits(&pb, 1, 0); //is not extension
544
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 27 if (s->needs_pce)
545 9 put_pce(&pb, avctx);
546
547 //Explicitly Mark SBR absent
548 27 put_bits(&pb, 11, 0x2b7); //sync extension
549 27 put_bits(&pb, 5, AOT_SBR);
550 27 put_bits(&pb, 1, 0);
551 27 flush_put_bits(&pb);
552 27 avctx->extradata_size = put_bytes_output(&pb);
553
554 27 return 0;
555 }
556
557 14544 void ff_quantize_band_cost_cache_init(struct AACEncContext *s)
558 {
559 14544 ++s->quantize_band_cost_cache_generation;
560
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 14544 if (s->quantize_band_cost_cache_generation == 0) {
561 ✗ memset(s->quantize_band_cost_cache, 0, sizeof(s->quantize_band_cost_cache));
562 ✗ s->quantize_band_cost_cache_generation = 1;
563 }
564 14544 }
565
566 #define WINDOW_FUNC(type) \
567 static void apply_ ##type ##_window(AVFloatDSPContext *fdsp, \
568 SingleChannelElement *sce, \
569 const float *audio)
570
571 7785 WINDOW_FUNC(only_long)
572 {
573
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 7785 const float *lwindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_long_1024 : ff_sine_1024;
574
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 7785 const float *pwindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024;
575 7785 float *out = sce->ret_buf;
576
577 7785 fdsp->vector_fmul (out, audio, lwindow, 1024);
578 7785 fdsp->vector_fmul_reverse(out + 1024, audio + 1024, pwindow, 1024);
579 7785 }
580
581 424 WINDOW_FUNC(long_start)
582 {
583
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 424 const float *lwindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024;
584
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 424 const float *swindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
585 424 float *out = sce->ret_buf;
586
587 424 fdsp->vector_fmul(out, audio, lwindow, 1024);
588 424 memcpy(out + 1024, audio + 1024, sizeof(out[0]) * 448);
589 424 fdsp->vector_fmul_reverse(out + 1024 + 448, audio + 1024 + 448, swindow, 128);
590 424 memset(out + 1024 + 576, 0, sizeof(out[0]) * 448);
591 424 }
592
593 424 WINDOW_FUNC(long_stop)
594 {
595
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 424 const float *lwindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_long_1024 : ff_sine_1024;
596
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 424 const float *swindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128;
597 424 float *out = sce->ret_buf;
598
599 424 memset(out, 0, sizeof(out[0]) * 448);
600 424 fdsp->vector_fmul(out + 448, audio + 448, swindow, 128);
601 424 memcpy(out + 576, audio + 576, sizeof(out[0]) * 448);
602 424 fdsp->vector_fmul_reverse(out + 1024, audio + 1024, lwindow, 1024);
603 424 }
604
605 515 WINDOW_FUNC(eight_short)
606 {
607
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 515 const float *swindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
608
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 515 const float *pwindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128;
609 515 const float *in = audio + 448;
610 515 float *out = sce->ret_buf;
611 int w;
612
613
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 4635 for (w = 0; w < 8; w++) {
614
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 4120 fdsp->vector_fmul (out, in, w ? pwindow : swindow, 128);
615 4120 out += 128;
616 4120 in += 128;
617 4120 fdsp->vector_fmul_reverse(out, in, swindow, 128);
618 4120 out += 128;
619 }
620 515 }
621
622 static void (*const apply_window[4])(AVFloatDSPContext *fdsp,
623 SingleChannelElement *sce,
624 const float *audio) = {
625 [ONLY_LONG_SEQUENCE] = apply_only_long_window,
626 [LONG_START_SEQUENCE] = apply_long_start_window,
627 [EIGHT_SHORT_SEQUENCE] = apply_eight_short_window,
628 [LONG_STOP_SEQUENCE] = apply_long_stop_window
629 };
630
631 9148 static void apply_window_and_mdct(AACEncContext *s, SingleChannelElement *sce,
632 float *audio)
633 {
634 int i;
635 9148 float *output = sce->ret_buf;
636
637 9148 apply_window[sce->ics.window_sequence[0]](s->fdsp, sce, audio);
638
639
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 9148 if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE)
640 8633 s->mdct1024_fn(s->mdct1024, sce->coeffs, output, sizeof(float));
641 else
642
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 4635 for (i = 0; i < 1024; i += 128)
643 4120 s->mdct128_fn(s->mdct128, &sce->coeffs[i], output + i*2, sizeof(float));
644 9148 memcpy(audio, audio + 1024, sizeof(audio[0]) * 1024);
645 9148 memcpy(sce->pcoeffs, sce->coeffs, sizeof(sce->pcoeffs));
646 9148 }
647
648 /**
649 * Encode ics_info element.
650 * @see Table 4.6 (syntax of ics_info)
651 */
652 6122 static void put_ics_info(AACEncContext *s, IndividualChannelStream *info)
653 {
654 int w;
655
656 6122 put_bits(&s->pb, 1, 0); // ics_reserved bit
657 6122 put_bits(&s->pb, 2, info->window_sequence[0]);
658 6122 put_bits(&s->pb, 1, info->use_kb_window[0]);
659
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 6122 if (info->window_sequence[0] != EIGHT_SHORT_SEQUENCE) {
660 5851 put_bits(&s->pb, 6, info->max_sfb);
661 5851 put_bits(&s->pb, 1, 0); /* No predictor present */
662 } else {
663 271 put_bits(&s->pb, 4, info->max_sfb);
664
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 2168 for (w = 1; w < 8; w++)
665 1897 put_bits(&s->pb, 1, !info->group_len[w]);
666 }
667 6122 }
668
669 /**
670 * Encode MS data.
671 * @see 4.6.8.1 "Joint Coding - M/S Stereo"
672 */
673 5252 static void encode_ms_info(PutBitContext *pb, ChannelElement *cpe)
674 {
675 int i, w;
676
677 5252 put_bits(pb, 2, cpe->ms_mode);
678
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 5252 if (cpe->ms_mode == 1)
679
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 2573 for (w = 0; w < cpe->ch[0].ics.num_windows; w += cpe->ch[0].ics.group_len[w])
680
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 57643 for (i = 0; i < cpe->ch[0].ics.max_sfb; i++)
681 56309 put_bits(pb, 1, cpe->ms_mask[w*16 + i]);
682 5252 }
683
684 /**
685 * Produce integer coefficients from scalefactors provided by the model.
686 */
687 6122 static void adjust_frame_information(ChannelElement *cpe, int chans)
688 {
689 int i, w, w2, g, ch;
690 int maxsfb, cmaxsfb;
691
692
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 17496 for (ch = 0; ch < chans; ch++) {
693 11374 IndividualChannelStream *ics = &cpe->ch[ch].ics;
694 11374 maxsfb = 0;
695 11374 cpe->ch[ch].pulse.num_pulse = 0;
696
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 23463 for (w = 0; w < ics->num_windows; w += ics->group_len[w]) {
697
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 31386 for (cmaxsfb = ics->num_swb; cmaxsfb > 0 && cpe->ch[ch].zeroes[w*16+cmaxsfb-1]; cmaxsfb--)
698 ;
699 12089 maxsfb = FFMAX(maxsfb, cmaxsfb);
700 }
701 11374 ics->max_sfb = maxsfb;
702
703 //adjust zero bands for window groups
704
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 23463 for (w = 0; w < ics->num_windows; w += ics->group_len[w]) {
705
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 534563 for (g = 0; g < ics->max_sfb; g++) {
706 522474 i = 1;
707
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 527028 for (w2 = w; w2 < w + ics->group_len[w]; w2++) {
708
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 522584 if (!cpe->ch[ch].zeroes[w2*16 + g]) {
709 518030 i = 0;
710 518030 break;
711 }
712 }
713 522474 cpe->ch[ch].zeroes[w*16 + g] = i;
714 }
715 }
716 }
717
718
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 6122 if (chans > 1 && cpe->common_window) {
719 5252 IndividualChannelStream *ics0 = &cpe->ch[0].ics;
720 5252 IndividualChannelStream *ics1 = &cpe->ch[1].ics;
721 5252 int msc = 0;
722 5252 ics0->max_sfb = FFMAX(ics0->max_sfb, ics1->max_sfb);
723 5252 ics1->max_sfb = ics0->max_sfb;
724
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 12282 for (w = 0; w < ics0->num_windows*16; w += 16)
725
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 272328 for (i = 0; i < ics0->max_sfb; i++)
726
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 265298 if (cpe->ms_mask[w+i])
727 50542 msc++;
728
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 5252 if (msc == 0 || ics0->max_sfb == 0)
729 3595 cpe->ms_mode = 0;
730 else
731
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 1657 cpe->ms_mode = msc < ics0->max_sfb * ics0->num_windows ? 1 : 2;
732 }
733 6122 }
734
735 684 static void apply_intensity_stereo(ChannelElement *cpe)
736 {
737 int w, w2, g, i;
738 684 IndividualChannelStream *ics = &cpe->ch[0].ics;
739
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 684 if (!cpe->common_window)
740 136 return;
741
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 1133 for (w = 0; w < ics->num_windows; w += ics->group_len[w]) {
742
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 1308 for (w2 = 0; w2 < ics->group_len[w]; w2++) {
743 723 int start = (w+w2) * 128;
744
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 29150 for (g = 0; g < ics->num_swb; g++) {
745 28427 int p = -1 + 2 * (cpe->ch[1].band_type[w*16+g] - 14);
746 28427 float scale = cpe->ch[0].is_ener[w*16+g];
747
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 28427 if (!cpe->is_mask[w*16 + g]) {
748 19153 start += ics->swb_sizes[g];
749 19153 continue;
750 }
751
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 9274 if (cpe->ms_mask[w*16 + g])
752 2501 p *= -1;
753
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 306094 for (i = 0; i < ics->swb_sizes[g]; i++) {
754 296820 float sum = (cpe->ch[0].coeffs[start+i] + p*cpe->ch[1].coeffs[start+i])*scale;
755 296820 cpe->ch[0].coeffs[start+i] = sum;
756 296820 cpe->ch[1].coeffs[start+i] = 0.0f;
757 }
758 9274 start += ics->swb_sizes[g];
759 }
760 }
761 }
762 }
763
764 /* I/S acceptance level for the image-error EMA at full rate pressure */
765 #define NMR_IS_IMG_GATE 8000.0f
766
767 /* Frequency in Hz for the lower limit of intensity stereo */
768 #define NMR_IS_LOW_LIMIT 6100
769
770 /* M/S adoption: es < 0.5*em, content-driven and rate-free */
771 #define NMR_MS_EQUIV 0.5f
772 #define NMR_MS_MASK 0.0f
773
774 /* Pair decouple threshold on the joint-tool candidacy fraction EMA: pairs
775 * whose joint tools are mostly dead (diffuse decorrelated content) window
776 * per-channel and skip M/S; recouple above 1.3x. */
777 #define NMR_DECORR_LO 0.20f
778
779 /* Stereo-decision hysteresis: leaving a joint mode costs a margin. */
780 #define NMR_STICKY 2.0f
781
782 /* Decision statistics are EMA-smoothed across frames. */
783 #define NMR_SDEC_EMA 0.75f
784
785 /* PNS-stereo gate: substitute only clearly-decorrelated (wide) bands. */
786 #define NMR_PNS_STEREO_DECORR 0.6f
787
788 /* M/S balance gate: no M/S on bands panned harder than this energy ratio */
789 #define NMR_MS_BALANCE 0.25f
790
791 /* Perceptual I/S: highly correlated long-window bands above this frequency
792 * take I/S at this image-error budget regardless of rate pressure */
793 #define NMR_IS_PERC_FREQ 8000.0f
794 #define NMR_IS_PERC_CORR 0.85f
795 #define NMR_IS_PERC_GATE 50.0f
796
797 /* Recode one band's window group as mid+side in place. */
798 29576 static void nmr_apply_ms_band(AACEncContext *s, ChannelElement *cpe,
799 int w, int g, int start, int len, int gl)
800 {
801 29576 SingleChannelElement *sce0 = &cpe->ch[0];
802 29576 SingleChannelElement *sce1 = &cpe->ch[1];
803 29576 cpe->ms_mask[w*16+g] = 1;
804
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 63059 for (int w2 = 0; w2 < gl; w2++) {
805 33483 FFPsyBand *b0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
806 33483 FFPsyBand *b1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
807 33483 float *L = sce0->coeffs + start + (w+w2)*128;
808 33483 float *R = sce1->coeffs + start + (w+w2)*128;
809 33483 float em = 0.0f, es = 0.0f;
810
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 616479 for (int i = 0; i < len; i++) {
811 582996 float m = (L[i] + R[i]) * 0.5f;
812 582996 R[i] = m - R[i]; L[i] = m;
813 582996 em += L[i]*L[i]; es += R[i]*R[i];
814 }
815
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 33483 b0->threshold = FFMIN(b0->threshold, b1->threshold) * 0.5f;
816 33483 b1->threshold = b0->threshold;
817 33483 b0->energy = em; b1->energy = es;
818 }
819 29576 }
820
821 /* I/S perceptual test: reconstruction image error vs the pair's masks. */
822 26653 static int nmr_is_image_masked(AACEncContext *s, ChannelElement *cpe,
823 int w, int g, int start, int len, int gl,
824 float ener0, float ener1, float dot,
825 float minthr0, float minthr1, float *ratio_out,
826 float *scale_out, float *sr_out, int *p_out)
827 {
828
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 26653 int p = dot >= 0.0f ? 1 : -1;
829 26653 float ener01 = ener0 + ener1 + 2*p*dot; /* energy of L + p*R */
830 26653 *ratio_out = FLT_MAX;
831
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 26653 if (ener01 <= FLT_MIN)
832 ✗ return 0;
833 26653 float scale = sqrtf(ener0 / ener01); /* carrier = (L + p*R)*scale */
834 26653 float sr_ = sqrtf(ener1 / ener0); /* decoder: R = p*sr_*carrier */
835 26653 float img0 = 0.0f, img1 = 0.0f;
836
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 57292 for (int w2 = 0; w2 < gl; w2++) {
837 30639 const float *L = cpe->ch[0].coeffs + start + (w+w2)*128;
838 30639 const float *R = cpe->ch[1].coeffs + start + (w+w2)*128;
839
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 980623 for (int i = 0; i < len; i++) {
840 949984 float c = (L[i] + p*R[i]) * scale;
841 949984 float dl = L[i] - c, dr = R[i] - p*sr_*c;
842 949984 img0 += dl*dl; img1 += dr*dr;
843 }
844 }
845
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 26653 *ratio_out = FFMAX(img0 / FFMAX(minthr0 * gl, FLT_MIN),
846 img1 / FFMAX(minthr1 * gl, FLT_MIN));
847 26653 *scale_out = scale; *sr_out = sr_; *p_out = p;
848 26653 return 1;
849 }
850
851 /* Recode one band's window group as intensity stereo in place: replace L with the
852 * carrier, zero R, signal the phase via the side channel's band type, and fold the
853 * pair's masking into the surviving (carrier) channel. */
854 14340 static void nmr_apply_is_band(AACEncContext *s, ChannelElement *cpe,
855 int w, int g, int start, int len, int gl,
856 float scale, float sr_, int p,
857 float ener0, float ener1)
858 {
859 14340 cpe->is_mask[w*16+g] = 1;
860 14340 cpe->ch[0].is_ener[w*16+g] = scale;
861 14340 cpe->ch[1].is_ener[w*16+g] = ener0 / ener1;
862
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 14340 cpe->ch[1].band_type[w*16+g] = p > 0 ? INTENSITY_BT : INTENSITY_BT2;
863
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 28680 for (int w2 = 0; w2 < gl; w2++) {
864 14340 FFPsyBand *b0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
865 14340 FFPsyBand *b1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
866 14340 float *L = cpe->ch[0].coeffs + start + (w+w2)*128;
867 14340 float *R = cpe->ch[1].coeffs + start + (w+w2)*128;
868 14340 float ec = 0.0f;
869
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 512224 for (int i = 0; i < len; i++) {
870 497884 L[i] = (L[i] + p*R[i]) * scale;
871 497884 R[i] = 0.0f;
872 497884 ec += L[i]*L[i];
873 }
874
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 14340 b0->threshold = FFMIN(b0->threshold, b1->threshold / FFMAX(sr_*sr_, 1e-9f));
875 14340 b0->energy = ec; b1->energy = 0.0f;
876 }
877 14340 }
878
879 /*
880 * Per-band stereo-mode decision (L/R vs M/S vs intensity) for the NMR coder,
881 * made before quantization from the psychoacoustic model alone, so the
882 * quantizer search allocates natively on the spectra that are actually coded.
883 */
884 1337 static void nmr_decide_stereo(AACEncContext *s, ChannelElement *cpe)
885 {
886 1337 SingleChannelElement *sce0 = &cpe->ch[0];
887 1337 SingleChannelElement *sce1 = &cpe->ch[1];
888 1337 IndividualChannelStream *ics = &sce0->ics;
889 1337 const AVCodecContext *avctx = s->psy.avctx;
890 1337 const float freq_mult = avctx->sample_rate / (1024.0f / ics->num_windows) / 2.0f;
891 1337 int is_count = 0;
892
893
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 1337 if (s->nmr) {
894 1337 int pi = (s->cur_channel >> 1) & 7;
895 1337 pi = pi * 2 + (ics->num_windows == 8); /* per-grid state bank */
896
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 1337 if (!s->nmr->sinit[pi]) {
897 /* one-time init; per-grid banks persist across window switches
898 * (wiping them churned stereo modes audibly) */
899 96 memset(s->nmr->smode[pi], 0, sizeof(s->nmr->smode[pi]));
900
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 12384 for (int b = 0; b < 128; b++) {
901 12288 s->nmr->sema_em[pi][b] = 0.0f;
902 12288 s->nmr->sema_img[pi][b] = -1.0f;
903 }
904 96 s->nmr->sinit[pi] = 1;
905 }
906 }
907
908 /* Per-band stereo decision (L/R vs M/S vs I/S), made pre-quantization from
909 * the psy model so the trellis allocates on the coded spectra. */
910
911 /* I/S engages under SUSTAINED strain only: rate pressure gated by the
912 * lambda floor (pressure spikes at a comfortable operating point must
913 * not admit it). Unengaged candidates fall back to M/S. */
914 4011 float is_ramp = s->nmr ? s->nmr->press *
915
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 1337 av_clipf((s->nmr->lam_floor - 40.0f) / (120.0f - 40.0f), 0.0f, 1.0f) : 0.0f;
916 /* perceptual I/S (below) makes candidacy pressure-independent */
917 1337 const int allow_is = s->options.intensity_stereo;
918
919 1337 const int pidx = (s->cur_channel >> 1) & 15;
920 1337 const int decoupled = s->psy.pair_decoupled[pidx];
921 1337 int njoint = 0, nbands = 0; /* joint-tool candidacy census, decouple feed */
922
923
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 2797 for (int w = 0; w < ics->num_windows; w += ics->group_len[w]) {
924 1460 int start = 0;
925
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 65230 for (int g = 0; g < ics->num_swb; start += ics->swb_sizes[g++]) {
926 63770 int len = ics->swb_sizes[g], gl = ics->group_len[w];
927 63770 float ener0 = 0.0f, ener1 = 0.0f, dot = 0.0f, es_tot = 0.0f, em_tot = 0.0f;
928 63770 float minthr0 = FLT_MAX, minthr1 = FLT_MAX;
929
930 63770 cpe->is_mask[w*16+g] = 0;
931 63770 cpe->ms_mask[w*16+g] = 0;
932
933
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 135520 for (int w2 = 0; w2 < gl; w2++) {
934 71750 FFPsyBand *b0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
935 71750 FFPsyBand *b1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
936 71750 const float *L = sce0->coeffs + start + (w+w2)*128;
937 71750 const float *R = sce1->coeffs + start + (w+w2)*128;
938 71750 float el = 0.0f, er = 0.0f, em = 0.0f, es = 0.0f, d = 0.0f;
939
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 1440838 for (int i = 0; i < len; i++) {
940 1369088 float m = (L[i] + R[i]) * 0.5f;
941 1369088 float sv = m - R[i];
942 1369088 el += L[i]*L[i]; er += R[i]*R[i];
943 1369088 em += m*m; es += sv*sv; d += L[i]*R[i];
944 }
945 71750 ener0 += el; ener1 += er; dot += d; es_tot += es; em_tot += em;
946
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 71750 minthr0 = FFMIN(minthr0, b0->threshold);
947
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 71750 minthr1 = FFMIN(minthr1, b1->threshold);
948 }
949
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 63770 float thr_g = FFMIN(minthr0, minthr1) * gl; /* group masking budget */
950
951 /* PNS-stereo reservation: keep clearly-wide noise bands for PNS. */
952 63770 const int sidx = w*16+g;
953 {
954 63770 float es_w = es_tot, em_w = em_tot;
955
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 63770 if (s->nmr) {
956 63770 int pi_ = ((s->cur_channel >> 1) & 7) * 2 + (cpe->ch[0].ics.num_windows == 8);
957 63770 float pe = s->nmr->sema_es[pi_][sidx];
958 63770 float pm = s->nmr->sema_em[pi_][sidx];
959
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 63770 if (pm > 0.0f) {
960 59222 es_w = NMR_SDEC_EMA * pe + (1.0f - NMR_SDEC_EMA) * es_tot;
961 59222 em_w = NMR_SDEC_EMA * pm + (1.0f - NMR_SDEC_EMA) * em_tot;
962 }
963 }
964
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 63770 if (cpe->ch[0].can_pns[w*16+g] && cpe->ch[1].can_pns[w*16+g] &&
965
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 24553 es_w > NMR_PNS_STEREO_DECORR * em_w)
966 1029 continue;
967 }
968 62741 cpe->ch[0].can_pns[w*16+g] = cpe->ch[1].can_pns[w*16+g] = 0;
969
970 62741 int pi = ((s->cur_channel >> 1) & 7) * 2 + (cpe->ch[0].ics.num_windows == 8);
971
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 62741 uint8_t *pmode = s->nmr ? s->nmr->smode[pi] : NULL;
972
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 62741 int prev = pmode ? pmode[sidx] : 0;
973
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 62741 float eqgate = NMR_MS_EQUIV * (prev == 1 ? 1.5f : 1.0f); /* stay-until es>0.75em */
974 /* I/S = lossy economy: image-error budget scales with pressure */
975
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 62741 float imgate = NMR_IS_IMG_GATE * is_ramp * (prev == 2 ? NMR_STICKY : 1.0f);
976 /* Perceptual I/S (metric-blind by design - Zimtohrli penalizes
977 * even sub-mask image error, ears above ~8k do not hear
978 * interaural fine structure): engage on genuinely intensity-
979 * panned HF - high inter-channel correlation, long windows,
980 * sticky - regardless of rate pressure. Freed bits are judged
981 * by the sub-8k spectrum; the image itself is judged by ears. */
982
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 62741 if (cpe->ch[0].ics.num_windows != 8 && ener0 > FLT_MIN && ener1 > FLT_MIN) {
983 59345 float corr = dot / sqrtf(ener0 * ener1);
984
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 59345 if (start * freq_mult > NMR_IS_PERC_FREQ &&
985
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 21760 fabsf(corr) > NMR_IS_PERC_CORR * (prev == 2 ? 0.9f : 1.0f))
986
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 15406 imgate = FFMAX(imgate, NMR_IS_PERC_GATE * (prev == 2 ? NMR_STICKY : 1.0f));
987 }
988 62741 float es_d = es_tot, em_d = em_tot;
989
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 62741 if (s->nmr) {
990 62741 float *ees = &s->nmr->sema_es[pi][sidx];
991 62741 float *eem = &s->nmr->sema_em[pi][sidx];
992
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 62741 if (*eem <= 0.0f) { *ees = es_tot; *eem = em_tot; }
993 else {
994 58604 *ees = NMR_SDEC_EMA * *ees + (1.0f - NMR_SDEC_EMA) * es_tot;
995 58604 *eem = NMR_SDEC_EMA * *eem + (1.0f - NMR_SDEC_EMA) * em_tot;
996 }
997 62741 es_d = *ees; em_d = *eem;
998 }
999 /* Balance gate: M/S has no coding gain on a hard-panned band
1000 * (|S| ~ |M|), and M/S quantization noise decorrelates across
1001 * the unfold, smearing the panned source into the far channel. */
1002
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 62741 int bal_ok = FFMIN(ener0, ener1) > NMR_MS_BALANCE * FFMAX(ener0, ener1);
1003
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 107842 int ms_would = s->options.mid_side &&
1004
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 45101 (s->options.mid_side == 1 ||
1005
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1006
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 45101 es_tot < NMR_MS_MASK * thr_g) && bal_ok));
1007
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 62741 int ms_ok = ms_would && !decoupled;
1008 float scale, sr_, imgratio; int p;
1009 /* I/S competes with M/S above the frequency limit (candidacy must
1010 * not be gated on !ms_ok - that leaves only unrenderable bands) */
1011
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 26779 int is_cand = start * freq_mult > NMR_IS_LOW_LIMIT &&
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 116173 ener0 > FLT_MIN && ener1 > FLT_MIN &&
1013 26653 nmr_is_image_masked(s, cpe, w, g, start, len, gl,
1014 ener0, ener1, dot, minthr0, minthr1,
1015 &imgratio, &scale, &sr_, &p);
1016 62741 int is_ok = is_cand;
1017
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 62741 if (s->nmr && start * freq_mult > NMR_IS_LOW_LIMIT) {
1018 /* smoothed image-error; updated only while candidate (fail-value
1019 * feeding jammed it permanently high) */
1020 26779 float *eim = &s->nmr->sema_img[pi][sidx];
1021
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 26779 if (is_cand) {
1022 /* seed from first measurement; freeze when not candidate */
1023
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 26653 if (*eim < 0.0f) *eim = imgratio;
1024
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 24919 else *eim = NMR_SDEC_EMA * *eim + (1.0f - NMR_SDEC_EMA) * FFMIN(imgratio, 100.0f * NMR_IS_IMG_GATE);
1025 }
1026
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 26779 is_ok = is_cand && *eim >= 0.0f && *eim < imgate;
1027 }
1028
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 62741 njoint += ms_would || is_ok; nbands++;
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 62741 if (pmode) {
1031
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 62741 int m_ = (is_ok && allow_is) ? 2 : ms_ok ? 1 :
1032 ✗ (is_ok && s->options.mid_side) ? 1 : 0;
1033 62741 pmode[sidx] = m_;
1034 62741 s->nmr->smode_band[(s->cur_channel >> 1) & 7][w*16+g] = m_;
1035 }
1036
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 62741 if (is_ok && allow_is) {
1037 14340 nmr_apply_is_band(s, cpe, w, g, start, len, gl,
1038 scale, sr_, p, ener0, ener1);
1039 14340 is_count++;
1040
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 48401 } else if (ms_ok || (is_ok && s->options.mid_side)) {
1041 29576 nmr_apply_ms_band(s, cpe, w, g, start, len, gl);
1042 }
1043 /* else: keep full L/R stereo */
1044 }
1045 }
1046 1337 cpe->is_mode = !!is_count;
1047
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 1337 if (nbands > 0) {
1049 /* Pair joint-tool value, read next frame by the psy pair-synced window
1050 * decision and the M/S candidacy above. Measured as CANDIDACY (not
1051 * adoption) so decoupling cannot starve its own signal and self-lock. */
1052 1337 float r = (float)njoint / nbands;
1053 1337 float *pj = &s->psy.pair_joint[pidx];
1054
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 1337 *pj = *pj > 0.0f ? 0.95f * *pj + 0.05f * r : r;
1055 1337 s->psy.pair_decoupled[pidx] = *pj <
1056
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 1337 (s->psy.pair_decoupled[pidx] ? 1.3f * NMR_DECORR_LO : NMR_DECORR_LO);
1057 }
1058 1337 }
1059
1060 412 static void apply_mid_side_stereo(ChannelElement *cpe)
1061 {
1062 int w, w2, g, i;
1063 412 IndividualChannelStream *ics = &cpe->ch[0].ics;
1064
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 412 if (!cpe->common_window)
1065 ✗ return;
1066
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 859 for (w = 0; w < ics->num_windows; w += ics->group_len[w]) {
1067
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 1027 for (w2 = 0; w2 < ics->group_len[w]; w2++) {
1068 580 int start = (w+w2) * 128;
1069
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 22280 for (g = 0; g < ics->num_swb; g++) {
1070 /* ms_mask can be used for other purposes in PNS and I/S,
1071 * so must not apply M/S if any band uses either, even if
1072 * ms_mask is set.
1073 */
1074
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 21700 if (!cpe->ms_mask[w*16 + g] || cpe->is_mask[w*16 + g]
1075
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 21700 || cpe->ch[0].band_type[w*16 + g] >= NOISE_BT
1076
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 21700 || cpe->ch[1].band_type[w*16 + g] >= NOISE_BT) {
1077 ✗ start += ics->swb_sizes[g];
1078 ✗ continue;
1079 }
1080
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 443588 for (i = 0; i < ics->swb_sizes[g]; i++) {
1081 421888 float L = (cpe->ch[0].coeffs[start+i] + cpe->ch[1].coeffs[start+i]) * 0.5f;
1082 421888 float R = L - cpe->ch[1].coeffs[start+i];
1083 421888 cpe->ch[0].coeffs[start+i] = L;
1084 421888 cpe->ch[1].coeffs[start+i] = R;
1085 }
1086 21700 start += ics->swb_sizes[g];
1087 }
1088 }
1089 }
1090 }
1091
1092 /**
1093 * Encode scalefactor band coding type.
1094 */
1095 11374 static void encode_band_info(AACEncContext *s, SingleChannelElement *sce)
1096 {
1097 int w;
1098
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 11374 if (s->coder->set_special_band_scalefactors)
1100 11374 s->coder->set_special_band_scalefactors(s, sce);
1101
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 23463 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
1103 {
1104 /* the sectioning trellis must trade section bits against
1105 * spectral bits at the coder's REAL operating lambda; the
1106 * NMR outer-loop lambda is a static 120 */
1107 12089 float slam = s->lambda;
1108
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 12089 if (s->options.coder == AAC_CODER_NMR && s->nmr &&
1109
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 3671 s->nmr->lam_slew > 0.0f)
1110 3659 slam = s->nmr->lam_slew;
1111 12089 s->coder->encode_window_bands_info(s, sce, w, sce->ics.group_len[w], slam);
1112 }
1113 11374 }
1114
1115 /**
1116 * Encode scalefactors.
1117 */
1118 11374 static void encode_scale_factors(AVCodecContext *avctx, AACEncContext *s,
1119 SingleChannelElement *sce)
1120 {
1121 11374 int diff, off_sf = sce->sf_idx[0], off_pns = sce->sf_idx[0] - NOISE_OFFSET;
1122 11374 int off_is = 0, noise_flag = 1;
1123 int i, w;
1124
1125
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 23463 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
1126
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 537732 for (i = 0; i < sce->ics.max_sfb; i++) {
1127
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 525643 if (!sce->zeroes[w*16 + i]) {
1128
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 513344 if (sce->band_type[w*16 + i] == NOISE_BT) {
1129 3416 diff = sce->sf_idx[w*16 + i] - off_pns;
1130 3416 off_pns = sce->sf_idx[w*16 + i];
1131
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 3416 if (noise_flag-- > 0) {
1132 842 put_bits(&s->pb, NOISE_PRE_BITS, diff + NOISE_PRE);
1133 842 continue;
1134 }
1135
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 509928 } else if (sce->band_type[w*16 + i] == INTENSITY_BT ||
1136
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 489532 sce->band_type[w*16 + i] == INTENSITY_BT2) {
1137 22786 diff = sce->sf_idx[w*16 + i] - off_is;
1138 22786 off_is = sce->sf_idx[w*16 + i];
1139 } else {
1140 487142 diff = sce->sf_idx[w*16 + i] - off_sf;
1141 487142 off_sf = sce->sf_idx[w*16 + i];
1142 }
1143 512502 diff += SCALE_DIFF_ZERO;
1144
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 512502 av_assert0(diff >= 0 && diff <= 120);
1145 512502 put_bits(&s->pb, ff_aac_scalefactor_bits[diff], ff_aac_scalefactor_code[diff]);
1146 }
1147 }
1148 }
1149 11374 }
1150
1151 /**
1152 * Encode pulse data.
1153 */
1154 11374 static void encode_pulses(AACEncContext *s, Pulse *pulse)
1155 {
1156 int i;
1157
1158 11374 put_bits(&s->pb, 1, !!pulse->num_pulse);
1159
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 11374 if (!pulse->num_pulse)
1160 11374 return;
1161
1162 ✗ put_bits(&s->pb, 2, pulse->num_pulse - 1);
1163 ✗ put_bits(&s->pb, 6, pulse->start);
1164 ✗ for (i = 0; i < pulse->num_pulse; i++) {
1165 ✗ put_bits(&s->pb, 5, pulse->pos[i]);
1166 ✗ put_bits(&s->pb, 4, pulse->amp[i]);
1167 }
1168 }
1169
1170 /**
1171 * Encode spectral coefficients processed by psychoacoustic model.
1172 */
1173 11374 static void encode_spectral_coeffs(AACEncContext *s, SingleChannelElement *sce)
1174 {
1175 int start, i, w, w2;
1176
1177
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 23463 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
1178 12089 start = 0;
1179
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 537732 for (i = 0; i < sce->ics.max_sfb; i++) {
1180
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 525643 if (sce->zeroes[w*16 + i]) {
1181 12299 start += sce->ics.swb_sizes[i];
1182 12299 continue;
1183 }
1184
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 1059603 for (w2 = w; w2 < w + sce->ics.group_len[w]; w2++) {
1185 546259 s->coder->quantize_and_encode_band(s, &s->pb,
1186 546259 &sce->coeffs[start + w2*128],
1187 546259 NULL, sce->ics.swb_sizes[i],
1188 546259 sce->sf_idx[w*16 + i],
1189 546259 sce->band_type[w*16 + i],
1190 s->lambda,
1191 546259 sce->ics.window_clipping[w]);
1192 }
1193 513344 start += sce->ics.swb_sizes[i];
1194 }
1195 }
1196 11374 }
1197
1198 /**
1199 * Downscale spectral coefficients for near-clipping windows to avoid artifacts
1200 */
1201 9148 static void avoid_clipping(AACEncContext *s, SingleChannelElement *sce)
1202 {
1203 int start, i, j, w;
1204
1205
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 9148 if (sce->ics.clip_avoidance_factor < 1.0f) {
1206
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 282 for (w = 0; w < sce->ics.num_windows; w++) {
1207 169 start = 0;
1208
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 5855 for (i = 0; i < sce->ics.max_sfb; i++) {
1209 5686 float *swb_coeffs = &sce->coeffs[start + w*128];
1210
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 111230 for (j = 0; j < sce->ics.swb_sizes[i]; j++)
1211 105544 swb_coeffs[j] *= sce->ics.clip_avoidance_factor;
1212 5686 start += sce->ics.swb_sizes[i];
1213 }
1214 }
1215 }
1216 9148 }
1217
1218 /**
1219 * Encode one channel of audio data.
1220 */
1221 11374 static int encode_individual_channel(AVCodecContext *avctx, AACEncContext *s,
1222 SingleChannelElement *sce,
1223 int common_window)
1224 {
1225 11374 put_bits(&s->pb, 8, sce->sf_idx[0]);
1226
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 11374 if (!common_window)
1227 870 put_ics_info(s, &sce->ics);
1228 11374 encode_band_info(s, sce);
1229 11374 encode_scale_factors(avctx, s, sce);
1230 11374 encode_pulses(s, &sce->pulse);
1231 11374 put_bits(&s->pb, 1, !!sce->tns.present);
1232
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 11374 if (s->coder->encode_tns_info)
1233 11374 s->coder->encode_tns_info(s, sce);
1234 11374 put_bits(&s->pb, 1, 0); //ssr
1235 11374 encode_spectral_coeffs(s, sce);
1236 11374 return 0;
1237 }
1238
1239 /**
1240 * Write some auxiliary information about the created AAC file.
1241 */
1242 9 static void put_bitstream_info(AACEncContext *s, const char *name)
1243 {
1244 int i, namelen, padbits;
1245
1246 9 namelen = strlen(name) + 2;
1247 9 put_bits(&s->pb, 3, TYPE_FIL);
1248 9 put_bits(&s->pb, 4, FFMIN(namelen, 15));
1249
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 9 if (namelen >= 15)
1250 9 put_bits(&s->pb, 8, namelen - 14);
1251 9 put_bits(&s->pb, 4, 0); //extension type - filler
1252 9 padbits = -put_bits_count(&s->pb) & 7;
1253 9 align_put_bits(&s->pb);
1254
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 126 for (i = 0; i < namelen - 2; i++)
1255 117 put_bits(&s->pb, 8, name[i]);
1256 9 put_bits(&s->pb, 12 - padbits, 0);
1257 9 }
1258
1259 /*
1260 * Copy input samples.
1261 * Channels are reordered from libavcodec's default order to AAC order.
1262 */
1263 4359 static void copy_input_samples(AACEncContext *s, const AVFrame *frame)
1264 {
1265 int ch;
1266
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 4359 int end = 2048 + (frame ? frame->nb_samples : 0);
1267 4359 const uint8_t *channel_map = s->reorder_map;
1268
1269 /* copy and remap input samples */
1270
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 13654 for (ch = 0; ch < s->channels; ch++) {
1271 /* copy last 1024 samples of previous frame to the start of the current frame */
1272 9295 memcpy(&s->planar_samples[ch][1024], &s->planar_samples[ch][2048], 1024 * sizeof(s->planar_samples[0][0]));
1273
1274 /* copy new samples and zero any remaining samples */
1275
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 9295 if (frame) {
1276 9001 memcpy(&s->planar_samples[ch][2048],
1277 9001 frame->extended_data[channel_map[ch]],
1278 9001 frame->nb_samples * sizeof(s->planar_samples[0][0]));
1279 }
1280 9295 memset(&s->planar_samples[ch][end], 0,
1281 9295 (3072 - end) * sizeof(s->planar_samples[0][0]));
1282 }
1283 4359 }
1284
1285 4386 static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
1286 const AVFrame *frame, int *got_packet_ptr)
1287 {
1288 4386 AACEncContext *s = avctx->priv_data;
1289 4386 float **samples = s->planar_samples, *samples2, *la, *overlap;
1290 ChannelElement *cpe;
1291 SingleChannelElement *sce;
1292 IndividualChannelStream *ics;
1293 int i, its, ch, w, chans, tag, start_ch, ret, frame_bits;
1294 int target_bits, rate_bits, too_many_bits, too_few_bits;
1295 4386 int ms_mode = 0, is_mode = 0, tns_mode = 0, pred_mode = 0;
1296 int chan_el_counter[4];
1297 FFPsyWindowInfo windows[AAC_MAX_CHANNELS];
1298
1299 /* add current frame to queue */
1300
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 4386 if (frame) {
1301
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 4305 if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
1302 ✗ return ret;
1303 } else {
1304
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 81 if (!s->afq.remaining_samples || (!s->afq.frame_alloc && !s->afq.frame_count))
1305 27 return 0;
1306 }
1307
1308 4359 copy_input_samples(s, frame);
1309
1310
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 4359 if (!avctx->frame_num)
1311 27 return 0;
1312
1313 4332 start_ch = 0;
1314
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 9321 for (i = 0; i < s->chan_map[0]; i++) {
1315 4989 FFPsyWindowInfo* wi = windows + start_ch;
1316 4989 tag = s->chan_map[i+1];
1317
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 4989 chans = tag == TYPE_CPE ? 2 : 1;
1318 4989 cpe = &s->cpe[i];
1319 {
1320 4989 int wi_paired = 0;
1321 /* Synced pair windows: decide both channels of a CPE together so
1322 * their block switching never diverges (see psy window_pair). */
1323
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 4989 if (chans == 2 && tag != TYPE_LFE && s->psy.model->window_pair && frame) {
1324 4039 const float *ov0 = &samples[start_ch][0], *ov1 = &samples[start_ch + 1][0];
1325 4039 s->psy.model->window_pair(&s->psy,
1326 ov0 + 1024, ov0 + 1024 + 448 + 64,
1327 ov1 + 1024, ov1 + 1024 + 448 + 64,
1328 start_ch, start_ch + 1,
1329 4039 cpe->ch[0].ics.window_sequence[0],
1330 4039 cpe->ch[1].ics.window_sequence[0],
1331 wi);
1332 4039 wi_paired = 1;
1333 }
1334
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 14137 for (ch = 0; ch < chans; ch++) {
1335 int k;
1336 float clip_avoidance_factor;
1337 9148 sce = &cpe->ch[ch];
1338 9148 ics = &sce->ics;
1339 9148 s->cur_channel = start_ch + ch;
1340 9148 overlap = &samples[s->cur_channel][0];
1341 9148 samples2 = overlap + 1024;
1342 9148 la = samples2 + (448+64);
1343
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 9148 if (!frame)
1344 294 la = NULL;
1345
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 9148 if (tag == TYPE_LFE) {
1346 138 wi[ch].window_type[0] = wi[ch].window_type[1] = ONLY_LONG_SEQUENCE;
1347 138 wi[ch].window_shape = 0;
1348 138 wi[ch].num_windows = 1;
1349 138 wi[ch].grouping[0] = 1;
1350 138 wi[ch].clipping[0] = 0;
1351
1352 /* Only the lowest 12 coefficients are used in a LFE channel.
1353 * The expression below results in only the bottom 8 coefficients
1354 * being used for 11.025kHz to 16kHz sample rates.
1355 */
1356
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 138 ics->num_swb = s->samplerate_index >= 8 ? 1 : 3;
1357
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 9010 } else if (!wi_paired) {
1358 932 wi[ch] = s->psy.model->window(&s->psy, samples2, la, s->cur_channel,
1359 932 ics->window_sequence[0]);
1360 }
1361 9148 ics->window_sequence[1] = ics->window_sequence[0];
1362 9148 ics->window_sequence[0] = wi[ch].window_type[0];
1363 9148 ics->use_kb_window[1] = ics->use_kb_window[0];
1364 9148 ics->use_kb_window[0] = wi[ch].window_shape;
1365 9148 ics->num_windows = wi[ch].num_windows;
1366
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 9148 ics->swb_sizes = s->psy.bands [ics->num_windows == 8];
1367
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 9148 ics->num_swb = tag == TYPE_LFE ? ics->num_swb : s->psy.num_bands[ics->num_windows == 8];
1368 9148 ics->max_sfb = FFMIN(ics->max_sfb, ics->num_swb);
1369 18296 ics->swb_offset = wi[ch].window_type[0] == EIGHT_SHORT_SEQUENCE ?
1370
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 9148 ff_swb_offset_128 [s->samplerate_index]:
1371 8633 ff_swb_offset_1024[s->samplerate_index];
1372 18296 ics->tns_max_bands = wi[ch].window_type[0] == EIGHT_SHORT_SEQUENCE ?
1373
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 9148 ff_tns_max_bands_128 [s->samplerate_index]:
1374 8633 ff_tns_max_bands_1024[s->samplerate_index];
1375
1376
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 21901 for (w = 0; w < ics->num_windows; w++)
1377 12753 ics->group_len[w] = wi[ch].grouping[w];
1378
1379 /* Calculate input sample maximums and evaluate clipping risk */
1380 9148 clip_avoidance_factor = 0.0f;
1381
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 21901 for (w = 0; w < ics->num_windows; w++) {
1382 12753 const float *wbuf = overlap + w * 128;
1383 12753 const int wlen = 2048 / ics->num_windows;
1384 12753 float max = 0;
1385 int j;
1386 /* mdct input is 2 * output */
1387
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 18747857 for (j = 0; j < wlen; j++)
1388
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 18735104 max = FFMAX(max, fabsf(wbuf[j]));
1389 12753 wi[ch].clipping[w] = max;
1390 }
1391 /* Pre-attenuating hot frames costs 0.45 dB of level accuracy on
1392 * loud masters; float decoders don't clip, so the NMR coder
1393 * keeps levels exact. */
1394
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 9148 if (s->options.coder == AAC_CODER_NMR)
1395
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 8321 for (w = 0; w < ics->num_windows; w++)
1396 4913 wi[ch].clipping[w] = 0;
1397
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 21901 for (w = 0; w < ics->num_windows; w++) {
1398
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 12753 if (wi[ch].clipping[w] > CLIP_AVOIDANCE_FACTOR) {
1399 125 ics->window_clipping[w] = 1;
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 125 clip_avoidance_factor = FFMAX(clip_avoidance_factor, wi[ch].clipping[w]);
1401 } else {
1402 12628 ics->window_clipping[w] = 0;
1403 }
1404 }
1405
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 9148 if (clip_avoidance_factor > CLIP_AVOIDANCE_FACTOR) {
1406 113 ics->clip_avoidance_factor = CLIP_AVOIDANCE_FACTOR / clip_avoidance_factor;
1407 } else {
1408 9035 ics->clip_avoidance_factor = 1.0f;
1409 }
1410
1411 9148 apply_window_and_mdct(s, sce, overlap);
1412
1413
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 9376700 for (k = 0; k < 1024; k++) {
1414
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 9367552 if (!(fabs(cpe->ch[ch].coeffs[k]) < 1E16)) { // Ensure headroom for energy calculation
1415 ✗ av_log(avctx, AV_LOG_ERROR, "Input contains (near) NaN/+-Inf\n");
1416 ✗ return AVERROR(EINVAL);
1417 }
1418 }
1419 9148 avoid_clipping(s, sce);
1420 }
1421 }
1422 4989 start_ch += chans;
1423 }
1424
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 4332 if ((ret = ff_alloc_packet(avctx, avpkt, 8192 * s->channels)) < 0)
1425 ✗ return ret;
1426 4332 frame_bits = its = 0;
1427 do {
1428 5405 init_put_bits(&s->pb, avpkt->data, avpkt->size);
1429
1430
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 5405 if ((avctx->frame_num & 0xFF)==1 && !(avctx->flags & AV_CODEC_FLAG_BITEXACT))
1431 9 put_bitstream_info(s, LIBAVCODEC_IDENT);
1432 5405 start_ch = 0;
1433 5405 target_bits = 0;
1434 5405 memset(chan_el_counter, 0, sizeof(chan_el_counter));
1435
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 11527 for (i = 0; i < s->chan_map[0]; i++) {
1436 6122 FFPsyWindowInfo* wi = windows + start_ch;
1437 const float *coeffs[2];
1438 6122 tag = s->chan_map[i+1];
1439
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 6122 chans = tag == TYPE_CPE ? 2 : 1;
1440 6122 cpe = &s->cpe[i];
1441 6122 cpe->common_window = 0;
1442 6122 memset(cpe->is_mask, 0, sizeof(cpe->is_mask));
1443 6122 memset(cpe->ms_mask, 0, sizeof(cpe->ms_mask));
1444 6122 put_bits(&s->pb, 3, tag);
1445 6122 put_bits(&s->pb, 4, chan_el_counter[tag]++);
1446
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 17496 for (ch = 0; ch < chans; ch++) {
1447 11374 sce = &cpe->ch[ch];
1448 11374 coeffs[ch] = sce->coeffs;
1449 11374 memset(&sce->tns, 0, sizeof(TemporalNoiseShaping));
1450
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 1467246 for (w = 0; w < 128; w++)
1451
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 1455872 if (sce->band_type[w] > RESERVED_BT)
1452 25358 sce->band_type[w] = 0;
1453 }
1454 6122 s->psy.bitres.alloc = -1;
1455 6122 s->psy.bitres.bits = s->last_frame_pb_count / s->channels;
1456 6122 s->psy.model->analyze(&s->psy, start_ch, coeffs, wi);
1457
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 6122 if (s->psy.bitres.alloc > 0) {
1458 /* Lambda unused here on purpose, we need to take psy's unscaled allocation */
1459 8396 target_bits += s->psy.bitres.alloc
1460
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 4198 * (s->lambda / (avctx->global_quality ? avctx->global_quality : 120));
1461 4198 s->psy.bitres.alloc /= chans;
1462 }
1463 6122 s->cur_type = tag;
1464
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 6122 if (chans > 1
1465
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 5252 && wi[0].window_type[0] == wi[1].window_type[0]
1466
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 5252 && wi[0].window_shape == wi[1].window_shape) {
1467
1468 5252 cpe->common_window = 1;
1469
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 12282 for (w = 0; w < wi[0].num_windows; w++) {
1470
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 7030 if (wi[0].grouping[w] != wi[1].grouping[w]) {
1471 ✗ cpe->common_window = 0;
1472 ✗ break;
1473 }
1474 }
1475 }
1476
1477
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 8876 const int use_tns = s->options.tns && s->coder->search_for_tns &&
1478
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 2754 s->coder->apply_tns_filt;
1479
1480 /* The NMR coder rate-controls itself and never re-quantizes, so TNS must run
1481 * before the quantizer */
1482 6122 const int tns_first = s->options.coder == AAC_CODER_NMR;
1483
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 6122 if (tns_first && use_tns) {
1484
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 5479 for (ch = 0; ch < chans; ch++) {
1485 3408 sce = &cpe->ch[ch];
1486 3408 s->cur_channel = start_ch + ch;
1487 /* mono: mark_pns before TNS so the region cap sees PNS bands. Stereo
1488 * PNS is marked in its own block (below) after the stereo decision. */
1489
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 3408 if (chans == 1 && s->options.pns && s->coder->mark_pns)
1490 734 s->coder->mark_pns(s, avctx, sce);
1491 3408 s->coder->search_for_tns(s, sce);
1492 3408 s->coder->apply_tns_filt(s, sce);
1493
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 3408 if (sce->tns.present)
1494 68 tns_mode = 1;
1495 }
1496 }
1497
1498 /* NMR stereo PNS (imaging-safe). Mark each channel's noise-like bands on the
1499 * original L/R psy, then keep PNS only where BOTH channels are noise-like. */
1500
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 6122 if (chans == 2 && cpe->common_window && tns_first &&
1501
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 1337 s->options.pns && s->coder->mark_pns) {
1502 1337 s->cur_channel = start_ch; s->coder->mark_pns(s, avctx, &cpe->ch[0]);
1503 1337 s->cur_channel = start_ch + 1; s->coder->mark_pns(s, avctx, &cpe->ch[1]);
1504
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 172473 for (int b = 0; b < 128; b++)
1505
4/4
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 171136 if (!cpe->ch[0].can_pns[b] || !cpe->ch[1].can_pns[b])
1506 146524 cpe->ch[0].can_pns[b] = cpe->ch[1].can_pns[b] = 0;
1507 }
1508
1509 /* The NMR coder decides I/S and M/S BEFORE quantization, from the psy model,
1510 * and the trellis then allocates natively on the coeffs actually coded. */
1511
5/6
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✓ Branch 5 taken 3915 times.
 6122 if (chans == 2 && cpe->common_window && s->options.coder == AAC_CODER_NMR &&
1512
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 1337 (s->options.mid_side || s->options.intensity_stereo)) {
1513 1337 s->cur_channel = start_ch;
1514 1337 nmr_decide_stereo(s, cpe);
1515 }
1516 /* NMR pools the CPE bit budget: both channels of a pair are solved
1517 * jointly under one shared lambda (see aaccoder_nmr.h). */
1518
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 6122 if (s->options.coder == AAC_CODER_NMR && s->nmr)
1519 2071 s->nmr->pair = (chans == 2);
1520
2/2
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 17496 for (ch = 0; ch < chans; ch++) {
1521 11374 s->cur_channel = start_ch + ch;
1522 /* NMR PNS is mono-only */
1523
5/6
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 11374 if (s->options.pns && s->coder->mark_pns && !tns_first)
1524 1230 s->coder->mark_pns(s, avctx, &cpe->ch[ch]);
1525 11374 s->coder->search_for_quantizers(avctx, s, &cpe->ch[ch], s->lambda);
1526 }
1527
2/2
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 17496 for (ch = 0; ch < chans; ch++) { /* TNS (non-NMR) and PNS */
1528 11374 sce = &cpe->ch[ch];
1529 11374 s->cur_channel = start_ch + ch;
1530
4/4
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 11374 if (!tns_first && use_tns) {
1531 1230 s->coder->search_for_tns(s, sce);
1532 1230 s->coder->apply_tns_filt(s, sce);
1533
2/2
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✓ Branch 1 taken 1189 times.
 1230 if (sce->tns.present)
1534 41 tns_mode = 1;
1535 }
1536
4/4
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 11374 if (s->options.pns && s->coder->search_for_pns)
1537 1230 s->coder->search_for_pns(s, avctx, sce);
1538 }
1539 6122 s->cur_channel = start_ch;
1540
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✓ Branch 1 taken 3367 times.
 6122 if (s->options.intensity_stereo) { /* Intensity Stereo */
1541
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✓ Branch 1 taken 2071 times.
 2755 if (s->options.coder != AAC_CODER_NMR) { /* NMR: decided pre-search */
1542
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✗ Branch 1 not taken.
 684 if (s->coder->search_for_is)
1543 684 s->coder->search_for_is(s, avctx, cpe);
1544 684 apply_intensity_stereo(cpe);
1545 }
1546
2/2
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✓ Branch 1 taken 1242 times.
 2755 if (cpe->is_mode) is_mode = 1;
1547 }
1548
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✓ Branch 3 taken 1477 times.
 6122 if (s->options.mid_side && s->options.coder != AAC_CODER_NMR) { /* Mid/Side stereo */
1549
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 412 if (s->options.mid_side == -1 && s->coder->search_for_ms)
1550 ✗ s->coder->search_for_ms(s, cpe);
1551
1/2
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✗ Branch 1 not taken.
 412 else if (cpe->common_window)
1552 412 memset(cpe->ms_mask, 1, sizeof(cpe->ms_mask));
1553 412 apply_mid_side_stereo(cpe);
1554 }
1555 6122 adjust_frame_information(cpe, chans);
1556
2/2
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✓ Branch 1 taken 870 times.
 6122 if (chans == 2) {
1557 5252 put_bits(&s->pb, 1, cpe->common_window);
1558
1/2
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✗ Branch 1 not taken.
 5252 if (cpe->common_window) {
1559 5252 put_ics_info(s, &cpe->ch[0].ics);
1560 5252 encode_ms_info(&s->pb, cpe);
1561
2/2
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✓ Branch 1 taken 3595 times.
 5252 if (cpe->ms_mode) ms_mode = 1;
1562 }
1563 }
1564
2/2
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✓ Branch 1 taken 6122 times.
 17496 for (ch = 0; ch < chans; ch++) {
1565 11374 s->cur_channel = start_ch + ch;
1566 11374 encode_individual_channel(avctx, s, &cpe->ch[ch], cpe->common_window);
1567 }
1568 6122 start_ch += chans;
1569 }
1570
1571
2/2
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✓ Branch 1 taken 4994 times.
 5405 if (avctx->flags & AV_CODEC_FLAG_QSCALE) {
1572 /* When using a constant Q-scale, don't mess with lambda, unless
1573 * the frame does not fit the decoder buffer: retry coarser (the
1574 * coders' legality caps shrink with lambda) */
1575 411 frame_bits = put_bits_count(&s->pb);
1576
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 411 if (frame_bits < 6144 * s->channels - 3 || its >= 16)
1577 break;
1578 ✗ s->lambda *= FFMIN(0.9f, (6144.0f * s->channels - 3) / frame_bits);
1579 ✗ for (i = 0; i < s->chan_map[0]; i++) {
1580 ✗ chans = s->chan_map[i + 1] == TYPE_CPE ? 2 : 1;
1581 ✗ for (ch = 0; ch < chans; ch++)
1582 ✗ memcpy(s->cpe[i].ch[ch].coeffs, s->cpe[i].ch[ch].pcoeffs,
1583 sizeof(s->cpe[i].ch[ch].coeffs));
1584 }
1585 ✗ its++;
1586 ✗ continue;
1587 }
1588
1589 4994 frame_bits = put_bits_count(&s->pb);
1590
1591 /* The NMR coder rate-controls itself (global-lambda reservoir servo):
1592 * per-frame bits intentionally float around the nominal rate, so skip
1593 * the lambda rate loop and only intervene on a hard overflow. */
1594
3/4
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 4994 if (s->options.coder == AAC_CODER_NMR && avctx->bit_rate_tolerance != 0 &&
1595
1/2
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 1147 frame_bits < 6144 * s->channels - 3)
1596 1147 break;
1597
1598 /* rate control stuff
1599 * allow between the nominal bitrate, and what psy's bit reservoir says to target
1600 * but drift towards the nominal bitrate always
1601 */
1602 3847 rate_bits = avctx->bit_rate * 1024 / avctx->sample_rate;
1603
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 3847 rate_bits = FFMIN(rate_bits, 6144 * s->channels - 3);
1604 3847 too_many_bits = FFMAX(target_bits, rate_bits);
1605
2/2
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✓ Branch 1 taken 2981 times.
 3847 too_many_bits = FFMIN(too_many_bits, 6144 * s->channels - 3);
1606 3847 too_few_bits = FFMIN(FFMAX(rate_bits - rate_bits/4, target_bits), too_many_bits);
1607
1608 /* When strict bit-rate control is demanded */
1609
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 3847 if (avctx->bit_rate_tolerance == 0) {
1610 ✗ if (rate_bits < frame_bits) {
1611 ✗ float ratio = ((float)rate_bits) / frame_bits;
1612 ✗ s->lambda *= FFMIN(0.9f, ratio);
1613 ✗ continue;
1614 }
1615 /* reset lambda when solution is found */
1616 ✗ s->lambda = avctx->global_quality > 0 ? avctx->global_quality : 120;
1617 ✗ break;
1618 }
1619
1620 /* When using ABR, be strict (but only for increasing) */
1621 3847 too_few_bits = too_few_bits - too_few_bits/8;
1622 3847 too_many_bits = too_many_bits + too_many_bits/2;
1623
1624
2/2
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 3847 if ( its == 0 /* for steady-state Q-scale tracking */
1625
6/6
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✓ Branch 3 taken 848 times.
✓ Branch 4 taken 3 times.
✓ Branch 5 taken 8 times.
 1073 || (its < 5 && (frame_bits < too_few_bits || frame_bits > too_many_bits))
1626
1/2
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✓ Branch 1 taken 217 times.
 217 || frame_bits >= 6144 * s->channels - 3 )
1627 {
1628 3630 float ratio = ((float)rate_bits) / frame_bits;
1629
1630
4/4
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✓ Branch 3 taken 10 times.
 3630 if (frame_bits >= too_few_bits && frame_bits <= too_many_bits) {
1631 /*
1632 * This path is for steady-state Q-scale tracking
1633 * When frame bits fall within the stable range, we still need to adjust
1634 * lambda to maintain it like so in a stable fashion (large jumps in lambda
1635 * create artifacts and should be avoided), but slowly
1636 */
1637 2506 ratio = sqrtf(sqrtf(ratio));
1638 2506 ratio = av_clipf(ratio, 0.9f, 1.1f);
1639 } else {
1640 /* Not so fast though */
1641 1124 ratio = sqrtf(ratio);
1642 }
1643 3630 s->lambda = av_clipf(s->lambda * ratio, FLT_EPSILON, 65536.f);
1644
1645 /* Keep iterating if we must reduce and lambda is in the sky */
1646
4/4
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 3630 if (ratio > 0.9f && ratio < 1.1f) {
1647 break;
1648 } else {
1649
7/8
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 1073 if (is_mode || ms_mode || tns_mode || pred_mode) {
1650
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 29 for (i = 0; i < s->chan_map[0]; i++) {
1651 // Must restore coeffs
1652
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✓ Branch 1 taken 20 times.
 22 chans = tag == TYPE_CPE ? 2 : 1;
1653 22 cpe = &s->cpe[i];
1654
2/2
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✓ Branch 1 taken 22 times.
 46 for (ch = 0; ch < chans; ch++)
1655 24 memcpy(cpe->ch[ch].coeffs, cpe->ch[ch].pcoeffs, sizeof(cpe->ch[ch].coeffs));
1656 }
1657 }
1658 1073 its++;
1659 }
1660 } else {
1661 break;
1662 }
1663 } while (1);
1664
2/2
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✓ Branch 1 taken 3921 times.
 4332 if (avctx->flags & AV_CODEC_FLAG_QSCALE)
1665
1/2
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✗ Branch 1 not taken.
 411 s->lambda = avctx->global_quality > 0 ? avctx->global_quality : 120;
1666
1667 /* tool-usage stats over the final per-band decisions of this frame */
1668
2/2
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✓ Branch 1 taken 4332 times.
 9321 for (i = 0; i < s->chan_map[0]; i++) {
1669
2/2
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✓ Branch 1 taken 830 times.
 4989 int etag = s->chan_map[i + 1], echans = etag == TYPE_CPE ? 2 : 1;
1670 4989 ChannelElement *ce = &s->cpe[i];
1671 4989 IndividualChannelStream *ics = &ce->ch[0].ics;
1672
2/2
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✓ Branch 1 taken 4989 times.
 14137 for (ch = 0; ch < echans; ch++) { /* per-channel frame stats */
1673 9148 int is_short = ce->ch[ch].ics.window_sequence[0] == EIGHT_SHORT_SEQUENCE;
1674 9148 s->stat_chans++;
1675
2/2
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✓ Branch 1 taken 8633 times.
 9148 if (is_short)
1676 515 s->stat_short++;
1677
2/2
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✓ Branch 1 taken 9044 times.
 9148 if (ce->ch[ch].tns.present) {
1678
1/2
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✓ Branch 1 taken 104 times.
 104 if (is_short) s->stat_tns_short++;
1679 104 else s->stat_tns_long++;
1680 }
1681 }
1682
2/2
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✓ Branch 1 taken 4989 times.
 10339 for (w = 0; w < ics->num_windows; w += ics->group_len[w]) {
1683
2/2
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✓ Branch 1 taken 5350 times.
 239207 for (int g = 0; g < ics->num_swb; g++) {
1684 233857 int idx = w*16 + g, coded = 0;
1685
2/2
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✓ Branch 1 taken 233857 times.
 667606 for (ch = 0; ch < echans; ch++) {
1686 433749 SingleChannelElement *sce = &ce->ch[ch];
1687
4/4
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✓ Branch 1 taken 407160 times.
✓ Branch 2 taken 24711 times.
✓ Branch 3 taken 1878 times.
 433749 if (sce->zeroes[idx] && sce->band_type[idx] == 0)
1688 24711 continue;
1689 409038 s->stat_ch_bands++;
1690
2/2
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✓ Branch 1 taken 405897 times.
 409038 if (sce->band_type[idx] == NOISE_BT)
1691 3141 s->stat_pns++;
1692 409038 coded = 1;
1693 }
1694
4/4
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✓ Branch 1 taken 33965 times.
✓ Branch 2 taken 193322 times.
✓ Branch 3 taken 6570 times.
 233857 if (etag == TYPE_CPE && coded) {
1695 193322 s->stat_cpe_bands++;
1696
2/2
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✓ Branch 1 taken 145746 times.
 193322 if (ce->ms_mask[idx]) s->stat_ms++;
1697
2/2
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✓ Branch 1 taken 170558 times.
 193322 if (ce->is_mask[idx]) s->stat_is++;
1698 }
1699 }
1700 }
1701 }
1702
1703 4332 put_bits(&s->pb, 3, TYPE_END);
1704 4332 flush_put_bits(&s->pb);
1705
1706 4332 s->last_frame_pb_count = put_bits_count(&s->pb);
1707
1708 /* NMR rate accounting: how many bits the frame really took beyond what the
1709 * trellis counted; feeds the next frame's budget correction */
1710
2/2
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✓ Branch 1 taken 2774 times.
 4332 if (s->nmr) {
1711 1558 int counted = 0;
1712
2/2
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✓ Branch 1 taken 1558 times.
 4966 for (i = 0; i < s->channels; i++)
1713 3408 counted += s->nmr->counted[i];
1714
2/2
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✓ Branch 1 taken 6 times.
 1558 if (counted > 0) {
1715 1552 float side = (float)s->last_frame_pb_count - counted;
1716
2/2
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✓ Branch 1 taken 18 times.
 1552 if (s->nmr->side_inited) {
1717 1534 s->nmr->side_ema += 0.125f * (side - s->nmr->side_ema);
1718 } else {
1719 18 s->nmr->side_ema = side;
1720 18 s->nmr->side_inited = 1;
1721 }
1722 }
1723 }
1724 4332 avpkt->size = put_bytes_output(&s->pb);
1725
1726 /* NMR reports its real operating lambda: the corridor centre in CBR,
1727 * the quality-mode slew state in VBR/ABR - the lambda of the last long
1728 * operating-point solve, which short frames and legality re-solves do
1729 * not update (the outer-loop s->lambda is never touched for this coder
1730 * and would pin Qavg at its 120 init) */
1731
2/2
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✓ Branch 1 taken 6 times.
 1558 s->lambda_sum += (s->nmr && s->nmr->lam_slew > 0.0f &&
1732
4/4
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✓ Branch 1 taken 411 times.
✓ Branch 2 taken 411 times.
✓ Branch 3 taken 730 times.
 1552 ((avctx->flags & AV_CODEC_FLAG_QSCALE) || s->options.rc == 1)) ?
1733
2/2
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✓ Branch 1 taken 2774 times.
 8664 s->nmr->lam_slew :
1734
4/4
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✓ Branch 2 taken 730 times.
✓ Branch 3 taken 6 times.
 3510 (s->nmr && s->nmr->lam_rc > 0.0f) ? s->nmr->lam_rc : s->lambda;
1735 4332 s->lambda_count++;
1736
1737 4332 ret = ff_af_queue_remove(&s->afq, avctx->frame_size, avpkt);
1738
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 4332 times.
 4332 if (ret < 0)
1739 ✗ return ret;
1740
1741 4332 avpkt->flags |= AV_PKT_FLAG_KEY;
1742
1743 4332 *got_packet_ptr = 1;
1744 4332 return 0;
1745 }
1746
1747 27 static av_cold int aac_encode_end(AVCodecContext *avctx)
1748 {
1749 27 AACEncContext *s = avctx->priv_data;
1750
1751 38 av_log(avctx, AV_LOG_INFO,
1752 "Qavg: %.3f Tr: %.1f%% TNS(L): %.1f%% TNS(S): %.1f%% M/S: %.1f%% I/S: %.1f%% PNS: %.1f%%\n",
1753
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✗ Branch 1 not taken.
 27 s->lambda_count ? s->lambda_sum / s->lambda_count : NAN,
1754
1/2
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✗ Branch 1 not taken.
 27 s->stat_chans ? 100.0 * s->stat_short / s->stat_chans : 0.0,
1755
1/2
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✗ Branch 1 not taken.
 27 s->stat_chans - s->stat_short ? 100.0 * s->stat_tns_long / (s->stat_chans - s->stat_short) : 0.0,
1756
2/2
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✓ Branch 1 taken 6 times.
 27 s->stat_short ? 100.0 * s->stat_tns_short / s->stat_short : 0.0,
1757
2/2
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✓ Branch 1 taken 2 times.
 27 s->stat_cpe_bands ? 100.0 * s->stat_ms / s->stat_cpe_bands : 0.0,
1758
2/2
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✓ Branch 1 taken 2 times.
 27 s->stat_cpe_bands ? 100.0 * s->stat_is / s->stat_cpe_bands : 0.0,
1759
2/2
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✓ Branch 1 taken 1 times.
 27 s->stat_ch_bands ? 100.0 * s->stat_pns / s->stat_ch_bands : 0.0);
1760
1761 27 av_tx_uninit(&s->mdct1024);
1762 27 av_tx_uninit(&s->mdct128);
1763 27 ff_psy_end(&s->psy);
1764 27 ff_lpc_end(&s->lpc);
1765 27 av_freep(&s->buffer.samples);
1766 27 av_freep(&s->cpe);
1767 27 av_freep(&s->fdsp);
1768 27 av_freep(&s->nmr);
1769 27 ff_af_queue_close(&s->afq);
1770 27 return 0;
1771 }
1772
1773 27 static av_cold int dsp_init(AVCodecContext *avctx, AACEncContext *s)
1774 {
1775 27 int ret = 0;
1776 27 float scale = 32768.0f;
1777
1778 27 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
1779
1/2
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 27 if (!s->fdsp)
1780 ✗ return AVERROR(ENOMEM);
1781
1782
1/2
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✓ Branch 2 taken 27 times.
 27 if ((ret = av_tx_init(&s->mdct1024, &s->mdct1024_fn, AV_TX_FLOAT_MDCT, 0,
1783 1024, &scale, 0)) < 0)
1784 ✗ return ret;
1785
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 27 times.
 27 if ((ret = av_tx_init(&s->mdct128, &s->mdct128_fn, AV_TX_FLOAT_MDCT, 0,
1786 128, &scale, 0)) < 0)
1787 ✗ return ret;
1788
1789 27 return 0;
1790 }
1791
1792 27 static av_cold int alloc_buffers(AVCodecContext *avctx, AACEncContext *s)
1793 {
1794 int ch;
1795
1/2
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✗ Branch 2 not taken.
 27 if (!FF_ALLOCZ_TYPED_ARRAY(s->buffer.samples, s->channels * 3 * 1024) ||
1796
1/2
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✓ Branch 2 taken 27 times.
 27 !FF_ALLOCZ_TYPED_ARRAY(s->cpe, s->chan_map[0]))
1797 ✗ return AVERROR(ENOMEM);
1798
1799
2/2
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✓ Branch 1 taken 27 times.
 174 for(ch = 0; ch < s->channels; ch++)
1800 147 s->planar_samples[ch] = s->buffer.samples + 3 * 1024 * ch;
1801
1802
2/2
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✓ Branch 1 taken 8 times.
 27 if (s->options.coder == AAC_CODER_NMR) {
1803 19 s->nmr = av_mallocz(sizeof(*s->nmr));
1804
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 19 times.
 19 if (!s->nmr)
1805 ✗ return AVERROR(ENOMEM);
1806 }
1807
1808 27 return 0;
1809 }
1810
1811 9 static av_cold int check_height_ext(AVCodecContext *avctx, AACEncContext *s)
1812 {
1813
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✗ Branch 1 not taken.
 81 for (int i = 0; i < avctx->ch_layout.nb_channels; i++) {
1814 81 enum AVChannel ch = av_channel_layout_channel_from_index(&avctx->ch_layout, i);
1815
3/4
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✓ Branch 1 taken 72 times.
✓ Branch 2 taken 9 times.
✗ Branch 3 not taken.
 81 if (ch >= AV_CHAN_TOP_FRONT_LEFT && ch <= AV_CHAN_TOP_BACK_RIGHT)
1816 9 return 1;
1817 // Layouts with TOP_SIDE channels also include the above.
1818 }
1819
1820 ✗ return 0;
1821 }
1822
1823 27 static av_cold int aac_encode_init(AVCodecContext *avctx)
1824 {
1825 27 AACEncContext *s = avctx->priv_data;
1826 27 int i, ret = 0;
1827 int chcfg;
1828 const uint8_t *sizes[2];
1829 uint8_t grouping[AAC_MAX_CHANNELS];
1830 int lengths[2];
1831
1832 /* Constants */
1833 27 s->last_frame_pb_count = 0;
1834 27 avctx->frame_size = 1024;
1835 27 avctx->initial_padding = 1024;
1836
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 27 s->lambda = avctx->global_quality > 0 ? avctx->global_quality : 120;
1837
1838 /* Channel map and unspecified bitrate guessing */
1839 27 s->channels = avctx->ch_layout.nb_channels;
1840
1841 27 s->needs_pce = 1;
1842
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 173 for (chcfg = 1; chcfg < FF_ARRAY_ELEMS(aac_normal_chan_layouts); chcfg++) {
1843
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 165 if (!av_channel_layout_compare(&avctx->ch_layout, &aac_normal_chan_layouts[chcfg])) {
1844 19 s->needs_pce = s->options.pce;
1845 19 break;
1846 }
1847 }
1848
1849
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 27 if (!s->needs_pce && chcfg == 7 /* 7.1(wide) */ && !s->options.allow_71wide) {
1850 /**
1851 * FFmpeg used to produce out-of-spec AAC files that mistagged 7.1
1852 * as 7.1(wide), and this wark-around is still enabled by default in
1853 * aacdec.c, so avoid producing such files in the rare case that the
1854 * user correctly passed 7.1(wide) channel layout content.
1855 */
1856 ✗ av_log(avctx, AV_LOG_INFO, "Forcing the use of PCE to encode 7.1(wide) "
1857 "channel layout to avoid ambiguity. Set -aac_allow_71wide 1 to "
1858 "override this behavior and force the use of spec-compliant "
1859 "channel configuration ID.\n");
1860 ✗ s->needs_pce = 1;
1861 }
1862
1863
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 27 if (s->needs_pce) {
1864 char buf[64];
1865
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 308 for (i = 0; i < FF_ARRAY_ELEMS(aac_pce_configs); i++)
1866
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 308 if (!av_channel_layout_compare(&avctx->ch_layout, &aac_pce_configs[i].layout))
1867 9 break;
1868 9 av_channel_layout_describe(&avctx->ch_layout, buf, sizeof(buf));
1869
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 9 if (i == FF_ARRAY_ELEMS(aac_pce_configs)) {
1870 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported channel layout \"%s\"\n", buf);
1871 ✗ return AVERROR(EINVAL);
1872 }
1873 9 av_log(avctx, AV_LOG_INFO, "Using a PCE to encode channel layout \"%s\"\n", buf);
1874 9 s->pce = aac_pce_configs[i];
1875 9 s->reorder_map = s->pce.reorder_map;
1876 9 s->chan_map = s->pce.config_map;
1877 9 s->needs_height_ext = check_height_ext(avctx, s);
1878 9 chcfg = 0;
1879 } else {
1880 18 s->reorder_map = aac_chan_maps[chcfg - 1];
1881 18 s->chan_map = aac_chan_configs[chcfg - 1];
1882 }
1883
1884
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 27 if (!avctx->bit_rate) {
1885
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 98 for (i = 1; i <= s->chan_map[0]; i++) {
1886
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 106 avctx->bit_rate += s->chan_map[i] == TYPE_CPE ? 128000 : /* Pair */
1887
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 27 s->chan_map[i] == TYPE_LFE ? 16000 : /* LFE */
1888 69000 ; /* SCE */
1889 }
1890 }
1891
1892 /* Samplerate */
1893 27 for (int i = 0;; i++) {
1894 107 av_assert1(i < 13);
1895
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 134 if (avctx->sample_rate == ff_mpeg4audio_sample_rates[i]) {
1896 27 s->samplerate_index = i;
1897 27 break;
1898 }
1899 }
1900
1901 /* Bitrate limiting */
1902
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 27 WARN_IF(1024.0 * avctx->bit_rate / avctx->sample_rate > 6144 * s->channels,
1903 "Too many bits %f > %d per frame requested, clamping to max\n",
1904 1024.0 * avctx->bit_rate / avctx->sample_rate,
1905 6144 * s->channels);
1906
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 27 avctx->bit_rate = (int64_t)FFMIN(6144 * s->channels / 1024.0 * avctx->sample_rate,
1907 avctx->bit_rate);
1908
1909 /* Profile and option setting */
1910
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 27 avctx->profile = avctx->profile == AV_PROFILE_UNKNOWN ? AV_PROFILE_AAC_LOW :
1911 avctx->profile;
1912
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 27 for (i = 0; i < FF_ARRAY_ELEMS(aacenc_profiles); i++)
1913
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 27 if (avctx->profile == aacenc_profiles[i])
1914 27 break;
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 27 ERROR_IF(i == FF_ARRAY_ELEMS(aacenc_profiles), "Profile not supported!\n");
1916
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 27 if (avctx->profile == AV_PROFILE_MPEG2_AAC_LOW) {
1917 ✗ avctx->profile = AV_PROFILE_AAC_LOW;
1918 ✗ WARN_IF(s->options.pns,
1919 "PNS unavailable in the \"mpeg2_aac_low\" profile, turning off\n");
1920 ✗ s->options.pns = 0;
1921 }
1922 27 s->profile = avctx->profile;
1923
1924 /* Coder limitations */
1925 27 s->coder = &ff_aac_coders[s->options.coder];
1926
1927 /* M/S introduces horrible artifacts with multichannel files, this is temporary */
1928
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 27 if (s->channels > 3)
1929 10 s->options.mid_side = 0;
1930
1931 /* Coding bandwidth, fixed at init time */
1932
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 27 if (avctx->cutoff > 0) {
1933 5 s->bandwidth = avctx->cutoff;
1934 } else {
1935 int frame_br;
1936
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 22 if (avctx->flags & AV_CODEC_FLAG_QSCALE) {
1937
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 1 if (s->options.coder == AAC_CODER_NMR) {
1938 /* nd-target VBR: expected per-channel rate from the quality
1939 * ladder (measured: q=1 ~ 64.5 kbps/ch, x1.27 per doubling) */
1940 2 float q = avctx->global_quality > 0 ?
1941
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 1 avctx->global_quality / (float)FF_QP2LAMBDA : 1.0f;
1942 1 frame_br = 66000 * powf(q, 0.29f);
1943 } else {
1944 ✗ frame_br = avctx->bit_rate / 2.0f * (s->lambda / 120.f) * 1.5f;
1945 }
1946 } else {
1947 21 frame_br = avctx->bit_rate / avctx->ch_layout.nb_channels;
1948 }
1949
1950
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 22 if (s->options.coder == AAC_CODER_NMR && frame_br >= 24000) {
1951 /* Ear-tuned, not metric-tuned: Zim rewards HF presence and cannot
1952 * hear HF graininess, so metric sweeps push this table wide. At
1953 * these rates coarse HF reads as beat-synchronous crunch (velvet);
1954 * FDK sits at 14k and Apple at ~16k for 64 kbps/ch. */
1955 static const int rates[] = { 24000, 32000, 48000, 64000, 96000, 192000 };
1956 static const int bws[] = { 14000, 14000, 15000, 16000, 19500, 22000 };
1957 19 int bw_i = 0;
1958
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 59 for (; bw_i < FF_ARRAY_ELEMS(rates) - 2 && frame_br > rates[bw_i + 1]; bw_i++);
1959 19 s->bandwidth = bws[bw_i] + (int)((int64_t)(bws[bw_i + 1] - bws[bw_i]) *
1960 19 (frame_br - rates[bw_i]) / (rates[bw_i + 1] - rates[bw_i]));
1961 19 s->bandwidth = FFMIN3(s->bandwidth, 22000, avctx->sample_rate / 2);
1962 } else {
1963
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 3 if (s->options.pns || s->options.intensity_stereo)
1964 1 frame_br *= 1.15f;
1965
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 3 s->bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_br, 1,
1966 avctx->sample_rate));
1967 }
1968
1969 22 s->bandwidth = FFMIN(FFMAX(s->bandwidth, 8000), avctx->sample_rate / 2);
1970 }
1971
1972
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 27 if (!(avctx->flags & AV_CODEC_FLAG_QSCALE) && avctx->bit_rate > 0) {
1973 26 int bpc = avctx->bit_rate / avctx->ch_layout.nb_channels;
1974
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 26 if (bpc <= 32000 && avctx->sample_rate > 32000)
1975 ✗ av_log(avctx, AV_LOG_INFO,
1976 "%d kb/s per channel at %d Hz: consider resampling the "
1977 "input to 32000 Hz or lower for better quality.\n",
1978 bpc / 1000, avctx->sample_rate);
1979 }
1980
1981 // Initialize static tables
1982 27 ff_aac_float_common_init();
1983
1984
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 27 if ((ret = dsp_init(avctx, s)) < 0)
1985 ✗ return ret;
1986
1987
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 27 if ((ret = alloc_buffers(avctx, s)) < 0)
1988 ✗ return ret;
1989
1990
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 27 if ((ret = put_audio_specific_config(avctx, chcfg)))
1991 ✗ return ret;
1992
1993 27 sizes[0] = ff_aac_swb_size_1024[s->samplerate_index];
1994 27 sizes[1] = ff_aac_swb_size_128[s->samplerate_index];
1995 27 lengths[0] = ff_aac_num_swb_1024[s->samplerate_index];
1996 27 lengths[1] = ff_aac_num_swb_128[s->samplerate_index];
1997
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 114 for (i = 0; i < s->chan_map[0]; i++)
1998 87 grouping[i] = s->chan_map[i + 1] == TYPE_CPE;
1999
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 29 s->psy.unbounded_pe = ((avctx->flags & AV_CODEC_FLAG_QSCALE) || s->options.rc == 1) &&
2000
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 2 s->options.coder == AAC_CODER_NMR;
2001
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 27 if ((ret = ff_psy_init(&s->psy, avctx, 2, sizes, lengths,
2002 27 s->chan_map[0], grouping, s->bandwidth)) < 0)
2003 ✗ return ret;
2004
2005 27 ff_lpc_init(&s->lpc, 2*avctx->frame_size, TNS_MAX_ORDER, FF_LPC_TYPE_LEVINSON);
2006 27 s->random_state = 0x1f2e3d4c;
2007
2008 27 ff_aacenc_dsp_init(&s->aacdsp);
2009
2010 27 ff_af_queue_init(avctx, &s->afq);
2011
2012 27 return 0;
2013 }
2014
2015 #define AACENC_FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
2016 static const AVOption aacenc_options[] = {
2017 {"aac_coder", "Coding algorithm", offsetof(AACEncContext, options.coder), AV_OPT_TYPE_INT, {.i64 = AAC_CODER_NMR}, 0, AAC_CODER_NB-1, AACENC_FLAGS, .unit = "coder"},
2018 {"twoloop", "Two loop searching method", 0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_TWOLOOP}, INT_MIN, INT_MAX, AACENC_FLAGS, .unit = "coder"},
2019 {"fast", "Fast search", 0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_FAST}, INT_MIN, INT_MAX, AACENC_FLAGS, .unit = "coder"},
2020 {"nmr", "Noise-to-mask ratio scalefactor trellis", 0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_NMR}, INT_MIN, INT_MAX, AACENC_FLAGS, .unit = "coder"},
2021 {"aac_ms", "Force M/S stereo coding", offsetof(AACEncContext, options.mid_side), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, AACENC_FLAGS},
2022 {"aac_is", "Intensity stereo coding", offsetof(AACEncContext, options.intensity_stereo), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AACENC_FLAGS},
2023 {"aac_pns", "Perceptual noise substitution", offsetof(AACEncContext, options.pns), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AACENC_FLAGS},
2024 {"aac_tns", "Temporal noise shaping", offsetof(AACEncContext, options.tns), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AACENC_FLAGS},
2025 {"aac_pce", "Forces the use of PCEs", offsetof(AACEncContext, options.pce), AV_OPT_TYPE_BOOL, {.i64 = 0}, -1, 1, AACENC_FLAGS},
2026 {"aac_rc", "Rate-control mode (NMR coder)", offsetof(AACEncContext, options.rc), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AACENC_FLAGS, .unit = "aac_rc"},
2027 {"cbr", "Constant bitrate (corridor + leaky bucket)", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, AACENC_FLAGS, .unit = "aac_rc"},
2028 {"abr", "Average bitrate (constant-quality target, slow rate servo)", 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, AACENC_FLAGS, .unit = "aac_rc"},
2029 {"aac_nmr_speed", "NMR coder speed level: 0 = slowest/best, higher trades quality for speed", offsetof(AACEncContext, options.nmr_speed), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 4, AACENC_FLAGS},
2030 {"aac_allow_71wide", "Allow non-PCE use of 7.1(wide) channel layout", offsetof(AACEncContext, options.allow_71wide), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AACENC_FLAGS},
2031 FF_AAC_PROFILE_OPTS
2032 {NULL}
2033 };
2034
2035 static const AVClass aacenc_class = {
2036 .class_name = "AAC encoder",
2037 .item_name = av_default_item_name,
2038 .option = aacenc_options,
2039 .version = LIBAVUTIL_VERSION_INT,
2040 };
2041
2042 static const FFCodecDefault aac_encode_defaults[] = {
2043 { "b", "0" },
2044 { NULL }
2045 };
2046
2047 const FFCodec ff_aac_encoder = {
2048 .p.name = "aac",
2049 CODEC_LONG_NAME("AAC (Advanced Audio Coding)"),
2050 .p.type = AVMEDIA_TYPE_AUDIO,
2051 .p.id = AV_CODEC_ID_AAC,
2052 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
2053 AV_CODEC_CAP_SMALL_LAST_FRAME,
2054 .priv_data_size = sizeof(AACEncContext),
2055 .init = aac_encode_init,
2056 FF_CODEC_ENCODE_CB(aac_encode_frame),
2057 .close = aac_encode_end,
2058 .defaults = aac_encode_defaults,
2059 CODEC_SAMPLERATES_ARRAY(ff_mpeg4audio_sample_rates),
2060 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
2061 CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP),
2062 .p.priv_class = &aacenc_class,
2063 };
2064