FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavutil/buffer.c
Date: 2025-07-11 09:13:03
Exec Total Coverage
Lines: 180 224 80.4%
Functions: 20 23 87.0%
Branches: 62 98 63.3%
Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include <stdatomic.h>
20 #include <stdint.h>
21 #include <string.h>
22
23 #include "avassert.h"
24 #include "buffer_internal.h"
25 #include "common.h"
26 #include "mem.h"
27 #include "thread.h"
28
29 4496939 static AVBufferRef *buffer_create(AVBuffer *buf, uint8_t *data, size_t size,
30 void (*free)(void *opaque, uint8_t *data),
31 void *opaque, int flags)
32 {
33 4496939 AVBufferRef *ref = NULL;
34
35 4496939 buf->data = data;
36 4496939 buf->size = size;
37
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 4496939 buf->free = free ? free : av_buffer_default_free;
38 4496939 buf->opaque = opaque;
39
40 4496939 atomic_init(&buf->refcount, 1);
41
42 4496939 buf->flags = flags;
43
44 4496939 ref = av_mallocz(sizeof(*ref));
45
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 4496939 if (!ref)
46 ✗ return NULL;
47
48 4496939 ref->buffer = buf;
49 4496939 ref->data = data;
50 4496939 ref->size = size;
51
52 4496939 return ref;
53 }
54
55 3367297 AVBufferRef *av_buffer_create(uint8_t *data, size_t size,
56 void (*free)(void *opaque, uint8_t *data),
57 void *opaque, int flags)
58 {
59 AVBufferRef *ret;
60 3367297 AVBuffer *buf = av_mallocz(sizeof(*buf));
61
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 3367297 if (!buf)
62 ✗ return NULL;
63
64 3367297 ret = buffer_create(buf, data, size, free, opaque, flags);
65
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 3367297 if (!ret) {
66 ✗ av_free(buf);
67 ✗ return NULL;
68 }
69 3367297 return ret;
70 }
71
72 1922442 void av_buffer_default_free(void *opaque, uint8_t *data)
73 {
74 1922442 av_free(data);
75 1922442 }
76
77 547749 AVBufferRef *av_buffer_alloc(size_t size)
78 {
79 547749 AVBufferRef *ret = NULL;
80 547749 uint8_t *data = NULL;
81
82 547749 data = av_malloc(size);
83
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 547749 if (!data)
84 ✗ return NULL;
85
86 547749 ret = av_buffer_create(data, size, av_buffer_default_free, NULL, 0);
87
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 547749 if (!ret)
88 ✗ av_freep(&data);
89
90 547749 return ret;
91 }
92
93 3137 AVBufferRef *av_buffer_allocz(size_t size)
94 {
95 3137 AVBufferRef *ret = av_buffer_alloc(size);
96
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 3137 if (!ret)
97 ✗ return NULL;
98
99 3137 memset(ret->data, 0, size);
100 3137 return ret;
101 }
102
103 4879945 AVBufferRef *av_buffer_ref(const AVBufferRef *buf)
104 {
105 4879945 AVBufferRef *ret = av_mallocz(sizeof(*ret));
106
107
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 4879945 if (!ret)
108 ✗ return NULL;
109
110 4879945 *ret = *buf;
111
112 4879945 atomic_fetch_add_explicit(&buf->buffer->refcount, 1, memory_order_relaxed);
113
114 4879945 return ret;
115 }
116
117 9376884 static void buffer_replace(AVBufferRef **dst, AVBufferRef **src)
118 {
119 AVBuffer *b;
120
121 9376884 b = (*dst)->buffer;
122
123
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 9376884 if (src) {
124 6391 **dst = **src;
125 6391 av_freep(src);
126 } else
127 9370493 av_freep(dst);
128
129
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 9376884 if (atomic_fetch_sub_explicit(&b->refcount, 1, memory_order_acq_rel) == 1) {
130 /* b->free below might already free the structure containing *b,
131 * so we have to read the flag now to avoid use-after-free. */
132 4496939 int free_avbuffer = !(b->flags_internal & BUFFER_FLAG_NO_FREE);
133 4496939 b->free(b->opaque, b->data);
134
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 4496939 if (free_avbuffer)
135 3367297 av_free(b);
136 }
137 9376884 }
138
139 95544379 void av_buffer_unref(AVBufferRef **buf)
140 {
141
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 95544379 if (!buf || !*buf)
142 86173886 return;
143
144 9370493 buffer_replace(buf, NULL);
145 }
146
147 2427372 int av_buffer_is_writable(const AVBufferRef *buf)
148 {
149
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 2427372 if (buf->buffer->flags & AV_BUFFER_FLAG_READONLY)
150 ✗ return 0;
151
152 2427372 return atomic_load(&buf->buffer->refcount) == 1;
153 }
154
155 ✗ void *av_buffer_get_opaque(const AVBufferRef *buf)
156 {
157 ✗ return buf->buffer->opaque;
158 }
159
160 141380 int av_buffer_get_ref_count(const AVBufferRef *buf)
161 {
162 141380 return atomic_load(&buf->buffer->refcount);
163 }
164
165 222 int av_buffer_make_writable(AVBufferRef **pbuf)
166 {
167 222 AVBufferRef *newbuf, *buf = *pbuf;
168
169
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 222 if (av_buffer_is_writable(buf))
170 27 return 0;
171
172 195 newbuf = av_buffer_alloc(buf->size);
173
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 195 if (!newbuf)
174 ✗ return AVERROR(ENOMEM);
175
176 195 memcpy(newbuf->data, buf->data, buf->size);
177
178 195 buffer_replace(pbuf, &newbuf);
179
180 195 return 0;
181 }
182
183 1375230 int av_buffer_realloc(AVBufferRef **pbuf, size_t size)
184 {
185 1375230 AVBufferRef *buf = *pbuf;
186 uint8_t *tmp;
187 int ret;
188
189
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 1375230 if (!buf) {
190 /* allocate a new buffer with av_realloc(), so it will be reallocatable
191 * later */
192 1365289 uint8_t *data = av_realloc(NULL, size);
193
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 1365289 if (!data)
194 ✗ return AVERROR(ENOMEM);
195
196 1365289 buf = av_buffer_create(data, size, av_buffer_default_free, NULL, 0);
197
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 1365289 if (!buf) {
198 ✗ av_freep(&data);
199 ✗ return AVERROR(ENOMEM);
200 }
201
202 1365289 buf->buffer->flags_internal |= BUFFER_FLAG_REALLOCATABLE;
203 1365289 *pbuf = buf;
204
205 1365289 return 0;
206
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 9941 } else if (buf->size == size)
207 ✗ return 0;
208
209
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 13824 if (!(buf->buffer->flags_internal & BUFFER_FLAG_REALLOCATABLE) ||
210
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 7628 !av_buffer_is_writable(buf) || buf->data != buf->buffer->data) {
211 /* cannot realloc, allocate a new reallocable buffer and copy data */
212 6196 AVBufferRef *new = NULL;
213
214 6196 ret = av_buffer_realloc(&new, size);
215
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 6196 if (ret < 0)
216 ✗ return ret;
217
218 6196 memcpy(new->data, buf->data, FFMIN(size, buf->size));
219
220 6196 buffer_replace(pbuf, &new);
221 6196 return 0;
222 }
223
224 3745 tmp = av_realloc(buf->buffer->data, size);
225
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 3745 if (!tmp)
226 ✗ return AVERROR(ENOMEM);
227
228 3745 buf->buffer->data = buf->data = tmp;
229 3745 buf->buffer->size = buf->size = size;
230 3745 return 0;
231 }
232
233 2877232 int av_buffer_replace(AVBufferRef **pdst, const AVBufferRef *src)
234 {
235 2877232 AVBufferRef *dst = *pdst;
236 AVBufferRef *tmp;
237
238
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 2877232 if (!src) {
239 227951 av_buffer_unref(pdst);
240 227951 return 0;
241 }
242
243
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 2649281 if (dst && dst->buffer == src->buffer) {
244 /* make sure the data pointers match */
245 75 dst->data = src->data;
246 75 dst->size = src->size;
247 75 return 0;
248 }
249
250 2649206 tmp = av_buffer_ref(src);
251
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 2649206 if (!tmp)
252 ✗ return AVERROR(ENOMEM);
253
254 2649206 av_buffer_unref(pdst);
255 2649206 *pdst = tmp;
256 2649206 return 0;
257 }
258
259 ✗ AVBufferPool *av_buffer_pool_init2(size_t size, void *opaque,
260 AVBufferRef* (*alloc)(void *opaque, size_t size),
261 void (*pool_free)(void *opaque))
262 {
263 ✗ AVBufferPool *pool = av_mallocz(sizeof(*pool));
264 ✗ if (!pool)
265 ✗ return NULL;
266
267 ✗ if (ff_mutex_init(&pool->mutex, NULL)) {
268 ✗ av_free(pool);
269 ✗ return NULL;
270 }
271
272 ✗ pool->size = size;
273 ✗ pool->opaque = opaque;
274 ✗ pool->alloc2 = alloc;
275 ✗ pool->alloc = av_buffer_alloc; // fallback
276 ✗ pool->pool_free = pool_free;
277
278 ✗ atomic_init(&pool->refcount, 1);
279
280 ✗ return pool;
281 }
282
283 52178 AVBufferPool *av_buffer_pool_init(size_t size, AVBufferRef* (*alloc)(size_t size))
284 {
285 52178 AVBufferPool *pool = av_mallocz(sizeof(*pool));
286
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 52178 if (!pool)
287 ✗ return NULL;
288
289
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 52178 if (ff_mutex_init(&pool->mutex, NULL)) {
290 ✗ av_free(pool);
291 ✗ return NULL;
292 }
293
294 52178 pool->size = size;
295
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 52178 pool->alloc = alloc ? alloc : av_buffer_alloc;
296
297 52178 atomic_init(&pool->refcount, 1);
298
299 52178 return pool;
300 }
301
302 104356 static void buffer_pool_flush(AVBufferPool *pool)
303 {
304
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 312227 while (pool->pool) {
305 207871 BufferPoolEntry *buf = pool->pool;
306 207871 pool->pool = buf->next;
307
308 207871 buf->free(buf->opaque, buf->data);
309 207871 av_freep(&buf);
310 }
311 104356 }
312
313 /*
314 * This function gets called when the pool has been uninited and
315 * all the buffers returned to it.
316 */
317 52178 static void buffer_pool_free(AVBufferPool *pool)
318 {
319 52178 buffer_pool_flush(pool);
320 52178 ff_mutex_destroy(&pool->mutex);
321
322
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 52178 if (pool->pool_free)
323 ✗ pool->pool_free(pool->opaque);
324
325 52178 av_freep(&pool);
326 52178 }
327
328 111868 void av_buffer_pool_uninit(AVBufferPool **ppool)
329 {
330 AVBufferPool *pool;
331
332
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 111868 if (!ppool || !*ppool)
333 59690 return;
334 52178 pool = *ppool;
335 52178 *ppool = NULL;
336
337 52178 ff_mutex_lock(&pool->mutex);
338 52178 buffer_pool_flush(pool);
339 52178 ff_mutex_unlock(&pool->mutex);
340
341
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 52178 if (atomic_fetch_sub_explicit(&pool->refcount, 1, memory_order_acq_rel) == 1)
342 31491 buffer_pool_free(pool);
343 }
344
345 1337513 static void pool_release_buffer(void *opaque, uint8_t *data)
346 {
347 1337513 BufferPoolEntry *buf = opaque;
348 1337513 AVBufferPool *pool = buf->pool;
349
350 1337513 ff_mutex_lock(&pool->mutex);
351 1337513 buf->next = pool->pool;
352 1337513 pool->pool = buf;
353 1337513 ff_mutex_unlock(&pool->mutex);
354
355
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 1337513 if (atomic_fetch_sub_explicit(&pool->refcount, 1, memory_order_acq_rel) == 1)
356 20687 buffer_pool_free(pool);
357 1337513 }
358
359 /* allocate a new buffer and override its free() callback so that
360 * it is returned to the pool on free */
361 207871 static AVBufferRef *pool_alloc_buffer(AVBufferPool *pool)
362 {
363 BufferPoolEntry *buf;
364 AVBufferRef *ret;
365
366
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 207871 av_assert0(pool->alloc || pool->alloc2);
367
368
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 207871 ret = pool->alloc2 ? pool->alloc2(pool->opaque, pool->size) :
369 207871 pool->alloc(pool->size);
370
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 207871 if (!ret)
371 ✗ return NULL;
372
373 207871 buf = av_mallocz(sizeof(*buf));
374
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 207871 if (!buf) {
375 ✗ av_buffer_unref(&ret);
376 ✗ return NULL;
377 }
378
379 207871 buf->data = ret->buffer->data;
380 207871 buf->opaque = ret->buffer->opaque;
381 207871 buf->free = ret->buffer->free;
382 207871 buf->pool = pool;
383
384 207871 ret->buffer->opaque = buf;
385 207871 ret->buffer->free = pool_release_buffer;
386
387 207871 return ret;
388 }
389
390 1337513 AVBufferRef *av_buffer_pool_get(AVBufferPool *pool)
391 {
392 AVBufferRef *ret;
393 BufferPoolEntry *buf;
394
395 1337513 ff_mutex_lock(&pool->mutex);
396 1337513 buf = pool->pool;
397
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 1337513 if (buf) {
398 1129642 memset(&buf->buffer, 0, sizeof(buf->buffer));
399 1129642 ret = buffer_create(&buf->buffer, buf->data, pool->size,
400 pool_release_buffer, buf, 0);
401
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 1129642 if (ret) {
402 1129642 pool->pool = buf->next;
403 1129642 buf->next = NULL;
404 1129642 buf->buffer.flags_internal |= BUFFER_FLAG_NO_FREE;
405 }
406 } else {
407 207871 ret = pool_alloc_buffer(pool);
408 }
409 1337513 ff_mutex_unlock(&pool->mutex);
410
411
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 1337513 if (ret)
412 1337513 atomic_fetch_add_explicit(&pool->refcount, 1, memory_order_relaxed);
413
414 1337513 return ret;
415 }
416
417 ✗ void *av_buffer_pool_buffer_get_opaque(const AVBufferRef *ref)
418 {
419 ✗ BufferPoolEntry *buf = ref->buffer->opaque;
420 ✗ av_assert0(buf);
421 ✗ return buf->opaque;
422 }
423