FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavutil/buffer.c
Date: 2024-04-25 15:36:26
Exec Total Coverage
Lines: 180 220 81.8%
Functions: 20 23 87.0%
Branches: 62 94 66.0%
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 4562352 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 4562352 AVBufferRef *ref = NULL;
34
35 4562352 buf->data = data;
36 4562352 buf->size = size;
37
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 4562352 buf->free = free ? free : av_buffer_default_free;
38 4562352 buf->opaque = opaque;
39
40 4562352 atomic_init(&buf->refcount, 1);
41
42 4562352 buf->flags = flags;
43
44 4562352 ref = av_mallocz(sizeof(*ref));
45
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 4562352 if (!ref)
46 ✗ return NULL;
47
48 4562352 ref->buffer = buf;
49 4562352 ref->data = data;
50 4562352 ref->size = size;
51
52 4562352 return ref;
53 }
54
55 3600624 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 3600624 AVBuffer *buf = av_mallocz(sizeof(*buf));
61
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 3600624 if (!buf)
62 ✗ return NULL;
63
64 3600624 ret = buffer_create(buf, data, size, free, opaque, flags);
65
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 3600624 if (!ret) {
66 ✗ av_free(buf);
67 ✗ return NULL;
68 }
69 3600624 return ret;
70 }
71
72 1906948 void av_buffer_default_free(void *opaque, uint8_t *data)
73 {
74 1906948 av_free(data);
75 1906948 }
76
77 586780 AVBufferRef *av_buffer_alloc(size_t size)
78 {
79 586780 AVBufferRef *ret = NULL;
80 586780 uint8_t *data = NULL;
81
82 586780 data = av_malloc(size);
83
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 586780 if (!data)
84 ✗ return NULL;
85
86 586780 ret = av_buffer_create(data, size, av_buffer_default_free, NULL, 0);
87
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 586780 if (!ret)
88 ✗ av_freep(&data);
89
90 586780 return ret;
91 }
92
93 95536 AVBufferRef *av_buffer_allocz(size_t size)
94 {
95 95536 AVBufferRef *ret = av_buffer_alloc(size);
96
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 95536 if (!ret)
97 ✗ return NULL;
98
99 95536 memset(ret->data, 0, size);
100 95536 return ret;
101 }
102
103 5480501 AVBufferRef *av_buffer_ref(const AVBufferRef *buf)
104 {
105 5480501 AVBufferRef *ret = av_mallocz(sizeof(*ret));
106
107
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 5480501 if (!ret)
108 ✗ return NULL;
109
110 5480501 *ret = *buf;
111
112 5480501 atomic_fetch_add_explicit(&buf->buffer->refcount, 1, memory_order_relaxed);
113
114 5480501 return ret;
115 }
116
117 10042853 static void buffer_replace(AVBufferRef **dst, AVBufferRef **src)
118 {
119 AVBuffer *b;
120
121 10042853 b = (*dst)->buffer;
122
123
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 10042853 if (src) {
124 6786 **dst = **src;
125 6786 av_freep(src);
126 } else
127 10036067 av_freep(dst);
128
129
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 10042853 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 4562352 int free_avbuffer = !(b->flags_internal & BUFFER_FLAG_NO_FREE);
133 4562352 b->free(b->opaque, b->data);
134
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 4562352 if (free_avbuffer)
135 3600624 av_free(b);
136 }
137 10042853 }
138
139 108281452 void av_buffer_unref(AVBufferRef **buf)
140 {
141
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 108281452 if (!buf || !*buf)
142 98245385 return;
143
144 10036067 buffer_replace(buf, NULL);
145 }
146
147 2432756 int av_buffer_is_writable(const AVBufferRef *buf)
148 {
149
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 2432756 if (buf->buffer->flags & AV_BUFFER_FLAG_READONLY)
150 ✗ return 0;
151
152 2432756 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 140502 int av_buffer_get_ref_count(const AVBufferRef *buf)
161 {
162 140502 return atomic_load(&buf->buffer->refcount);
163 }
164
165 200 int av_buffer_make_writable(AVBufferRef **pbuf)
166 {
167 200 AVBufferRef *newbuf, *buf = *pbuf;
168
169
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 200 if (av_buffer_is_writable(buf))
170 4 return 0;
171
172 196 newbuf = av_buffer_alloc(buf->size);
173
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 196 if (!newbuf)
174 ✗ return AVERROR(ENOMEM);
175
176 196 memcpy(newbuf->data, buf->data, buf->size);
177
178 196 buffer_replace(pbuf, &newbuf);
179
180 196 return 0;
181 }
182
183 1321724 int av_buffer_realloc(AVBufferRef **pbuf, size_t size)
184 {
185 1321724 AVBufferRef *buf = *pbuf;
186 uint8_t *tmp;
187 int ret;
188
189
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 1321724 if (!buf) {
190 /* allocate a new buffer with av_realloc(), so it will be reallocatable
191 * later */
192 1310935 uint8_t *data = av_realloc(NULL, size);
193
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 1310935 if (!data)
194 ✗ return AVERROR(ENOMEM);
195
196 1310935 buf = av_buffer_create(data, size, av_buffer_default_free, NULL, 0);
197
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 1310935 if (!buf) {
198 ✗ av_freep(&data);
199 ✗ return AVERROR(ENOMEM);
200 }
201
202 1310935 buf->buffer->flags_internal |= BUFFER_FLAG_REALLOCATABLE;
203 1310935 *pbuf = buf;
204
205 1310935 return 0;
206
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 10789 } else if (buf->size == size)
207 ✗ return 0;
208
209
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 15126 if (!(buf->buffer->flags_internal & BUFFER_FLAG_REALLOCATABLE) ||
210
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 8536 !av_buffer_is_writable(buf) || buf->data != buf->buffer->data) {
211 /* cannot realloc, allocate a new reallocable buffer and copy data */
212 6590 AVBufferRef *new = NULL;
213
214 6590 ret = av_buffer_realloc(&new, size);
215
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 6590 if (ret < 0)
216 ✗ return ret;
217
218 6590 memcpy(new->data, buf->data, FFMIN(size, buf->size));
219
220 6590 buffer_replace(pbuf, &new);
221 6590 return 0;
222 }
223
224 4199 tmp = av_realloc(buf->buffer->data, size);
225
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 4199 if (!tmp)
226 ✗ return AVERROR(ENOMEM);
227
228 4199 buf->buffer->data = buf->data = tmp;
229 4199 buf->buffer->size = buf->size = size;
230 4199 return 0;
231 }
232
233 4378500 int av_buffer_replace(AVBufferRef **pdst, const AVBufferRef *src)
234 {
235 4378500 AVBufferRef *dst = *pdst;
236 AVBufferRef *tmp;
237
238
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 4378500 if (!src) {
239 1216757 av_buffer_unref(pdst);
240 1216757 return 0;
241 }
242
243
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 3161743 if (dst && dst->buffer == src->buffer) {
244 /* make sure the data pointers match */
245 45096 dst->data = src->data;
246 45096 dst->size = src->size;
247 45096 return 0;
248 }
249
250 3116647 tmp = av_buffer_ref(src);
251
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 3116647 if (!tmp)
252 ✗ return AVERROR(ENOMEM);
253
254 3116647 av_buffer_unref(pdst);
255 3116647 *pdst = tmp;
256 3116647 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 ✗ ff_mutex_init(&pool->mutex, NULL);
268
269 ✗ pool->size = size;
270 ✗ pool->opaque = opaque;
271 ✗ pool->alloc2 = alloc;
272 ✗ pool->alloc = av_buffer_alloc; // fallback
273 ✗ pool->pool_free = pool_free;
274
275 ✗ atomic_init(&pool->refcount, 1);
276
277 ✗ return pool;
278 }
279
280 41826 AVBufferPool *av_buffer_pool_init(size_t size, AVBufferRef* (*alloc)(size_t size))
281 {
282 41826 AVBufferPool *pool = av_mallocz(sizeof(*pool));
283
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 41826 if (!pool)
284 ✗ return NULL;
285
286 41826 ff_mutex_init(&pool->mutex, NULL);
287
288 41826 pool->size = size;
289
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 41826 pool->alloc = alloc ? alloc : av_buffer_alloc;
290
291 41826 atomic_init(&pool->refcount, 1);
292
293 41826 return pool;
294 }
295
296 83652 static void buffer_pool_flush(AVBufferPool *pool)
297 {
298
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 263434 while (pool->pool) {
299 179782 BufferPoolEntry *buf = pool->pool;
300 179782 pool->pool = buf->next;
301
302 179782 buf->free(buf->opaque, buf->data);
303 179782 av_freep(&buf);
304 }
305 83652 }
306
307 /*
308 * This function gets called when the pool has been uninited and
309 * all the buffers returned to it.
310 */
311 41826 static void buffer_pool_free(AVBufferPool *pool)
312 {
313 41826 buffer_pool_flush(pool);
314 41826 ff_mutex_destroy(&pool->mutex);
315
316
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 41826 if (pool->pool_free)
317 ✗ pool->pool_free(pool->opaque);
318
319 41826 av_freep(&pool);
320 41826 }
321
322 93100 void av_buffer_pool_uninit(AVBufferPool **ppool)
323 {
324 AVBufferPool *pool;
325
326
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 93100 if (!ppool || !*ppool)
327 51274 return;
328 41826 pool = *ppool;
329 41826 *ppool = NULL;
330
331 41826 ff_mutex_lock(&pool->mutex);
332 41826 buffer_pool_flush(pool);
333 41826 ff_mutex_unlock(&pool->mutex);
334
335
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 41826 if (atomic_fetch_sub_explicit(&pool->refcount, 1, memory_order_acq_rel) == 1)
336 24292 buffer_pool_free(pool);
337 }
338
339 1141510 static void pool_release_buffer(void *opaque, uint8_t *data)
340 {
341 1141510 BufferPoolEntry *buf = opaque;
342 1141510 AVBufferPool *pool = buf->pool;
343
344 1141510 ff_mutex_lock(&pool->mutex);
345 1141510 buf->next = pool->pool;
346 1141510 pool->pool = buf;
347 1141510 ff_mutex_unlock(&pool->mutex);
348
349
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 1141510 if (atomic_fetch_sub_explicit(&pool->refcount, 1, memory_order_acq_rel) == 1)
350 17534 buffer_pool_free(pool);
351 1141510 }
352
353 /* allocate a new buffer and override its free() callback so that
354 * it is returned to the pool on free */
355 179782 static AVBufferRef *pool_alloc_buffer(AVBufferPool *pool)
356 {
357 BufferPoolEntry *buf;
358 AVBufferRef *ret;
359
360
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 179782 av_assert0(pool->alloc || pool->alloc2);
361
362
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 179782 ret = pool->alloc2 ? pool->alloc2(pool->opaque, pool->size) :
363 179782 pool->alloc(pool->size);
364
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 179782 if (!ret)
365 ✗ return NULL;
366
367 179782 buf = av_mallocz(sizeof(*buf));
368
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 179782 if (!buf) {
369 ✗ av_buffer_unref(&ret);
370 ✗ return NULL;
371 }
372
373 179782 buf->data = ret->buffer->data;
374 179782 buf->opaque = ret->buffer->opaque;
375 179782 buf->free = ret->buffer->free;
376 179782 buf->pool = pool;
377
378 179782 ret->buffer->opaque = buf;
379 179782 ret->buffer->free = pool_release_buffer;
380
381 179782 return ret;
382 }
383
384 1141510 AVBufferRef *av_buffer_pool_get(AVBufferPool *pool)
385 {
386 AVBufferRef *ret;
387 BufferPoolEntry *buf;
388
389 1141510 ff_mutex_lock(&pool->mutex);
390 1141510 buf = pool->pool;
391
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 1141510 if (buf) {
392 961728 memset(&buf->buffer, 0, sizeof(buf->buffer));
393 961728 ret = buffer_create(&buf->buffer, buf->data, pool->size,
394 pool_release_buffer, buf, 0);
395
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 961728 if (ret) {
396 961728 pool->pool = buf->next;
397 961728 buf->next = NULL;
398 961728 buf->buffer.flags_internal |= BUFFER_FLAG_NO_FREE;
399 }
400 } else {
401 179782 ret = pool_alloc_buffer(pool);
402 }
403 1141510 ff_mutex_unlock(&pool->mutex);
404
405
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 1141510 if (ret)
406 1141510 atomic_fetch_add_explicit(&pool->refcount, 1, memory_order_relaxed);
407
408 1141510 return ret;
409 }
410
411 ✗ void *av_buffer_pool_buffer_get_opaque(const AVBufferRef *ref)
412 {
413 ✗ BufferPoolEntry *buf = ref->buffer->opaque;
414 ✗ av_assert0(buf);
415 ✗ return buf->opaque;
416 }
417