557258d83906298bd984f9669a0467278fab4afc
[libav.git] / libavcodec / avpacket.c
1 /*
2 * AVPacket functions for libavcodec
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include <string.h>
23
24 #include "libavutil/avassert.h"
25 #include "libavutil/common.h"
26 #include "libavutil/internal.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/mem.h"
29 #include "avcodec.h"
30 #if FF_API_DESTRUCT_PACKET
31
32 void av_destruct_packet(AVPacket *pkt)
33 {
34 av_free(pkt->data);
35 pkt->data = NULL;
36 pkt->size = 0;
37 }
38
39 /* a dummy destruct callback for the callers that assume AVPacket.destruct ==
40 * NULL => static data */
41 static void dummy_destruct_packet(AVPacket *pkt)
42 {
43 av_assert0(0);
44 }
45 #endif
46
47 void av_init_packet(AVPacket *pkt)
48 {
49 pkt->pts = AV_NOPTS_VALUE;
50 pkt->dts = AV_NOPTS_VALUE;
51 pkt->pos = -1;
52 pkt->duration = 0;
53 pkt->convergence_duration = 0;
54 pkt->flags = 0;
55 pkt->stream_index = 0;
56 #if FF_API_DESTRUCT_PACKET
57 FF_DISABLE_DEPRECATION_WARNINGS
58 pkt->destruct = NULL;
59 FF_ENABLE_DEPRECATION_WARNINGS
60 #endif
61 pkt->buf = NULL;
62 pkt->side_data = NULL;
63 pkt->side_data_elems = 0;
64 }
65
66 static int packet_alloc(AVBufferRef **buf, int size)
67 {
68 int ret;
69 if ((unsigned)size >= (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
70 return AVERROR(EINVAL);
71
72 ret = av_buffer_realloc(buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
73 if (ret < 0)
74 return ret;
75
76 memset((*buf)->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
77
78 return 0;
79 }
80
81 int av_new_packet(AVPacket *pkt, int size)
82 {
83 AVBufferRef *buf = NULL;
84 int ret = packet_alloc(&buf, size);
85 if (ret < 0)
86 return ret;
87
88 av_init_packet(pkt);
89 pkt->buf = buf;
90 pkt->data = buf->data;
91 pkt->size = size;
92 #if FF_API_DESTRUCT_PACKET
93 FF_DISABLE_DEPRECATION_WARNINGS
94 pkt->destruct = dummy_destruct_packet;
95 FF_ENABLE_DEPRECATION_WARNINGS
96 #endif
97
98 return 0;
99 }
100
101 void av_shrink_packet(AVPacket *pkt, int size)
102 {
103 if (pkt->size <= size)
104 return;
105 pkt->size = size;
106 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
107 }
108
109 int av_grow_packet(AVPacket *pkt, int grow_by)
110 {
111 int new_size;
112 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
113 if (!pkt->size)
114 return av_new_packet(pkt, grow_by);
115 if ((unsigned)grow_by >
116 INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
117 return -1;
118
119 new_size = pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE;
120 if (pkt->buf) {
121 int ret = av_buffer_realloc(&pkt->buf, new_size);
122 if (ret < 0)
123 return ret;
124 } else {
125 pkt->buf = av_buffer_alloc(new_size);
126 if (!pkt->buf)
127 return AVERROR(ENOMEM);
128 memcpy(pkt->buf->data, pkt->data, FFMIN(pkt->size, pkt->size + grow_by));
129 #if FF_API_DESTRUCT_PACKET
130 FF_DISABLE_DEPRECATION_WARNINGS
131 pkt->destruct = dummy_destruct_packet;
132 FF_ENABLE_DEPRECATION_WARNINGS
133 #endif
134 }
135 pkt->data = pkt->buf->data;
136 pkt->size += grow_by;
137 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
138
139 return 0;
140 }
141
142 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
143 {
144 if (size >= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
145 return AVERROR(EINVAL);
146
147 pkt->buf = av_buffer_create(data, size + FF_INPUT_BUFFER_PADDING_SIZE,
148 av_buffer_default_free, NULL, 0);
149 if (!pkt->buf)
150 return AVERROR(ENOMEM);
151
152 pkt->data = data;
153 pkt->size = size;
154 #if FF_API_DESTRUCT_PACKET
155 FF_DISABLE_DEPRECATION_WARNINGS
156 pkt->destruct = dummy_destruct_packet;
157 FF_ENABLE_DEPRECATION_WARNINGS
158 #endif
159
160 return 0;
161 }
162
163 #define ALLOC_MALLOC(data, size) data = av_malloc(size)
164 #define ALLOC_BUF(data, size) \
165 do { \
166 av_buffer_realloc(&pkt->buf, size); \
167 data = pkt->buf ? pkt->buf->data : NULL; \
168 } while (0)
169
170 #define DUP_DATA(dst, src, size, padding, ALLOC) \
171 do { \
172 void *data; \
173 if (padding) { \
174 if ((unsigned)(size) > \
175 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
176 goto failed_alloc; \
177 ALLOC(data, size + FF_INPUT_BUFFER_PADDING_SIZE); \
178 } else { \
179 ALLOC(data, size); \
180 } \
181 if (!data) \
182 goto failed_alloc; \
183 memcpy(data, src, size); \
184 if (padding) \
185 memset((uint8_t *)data + size, 0, \
186 FF_INPUT_BUFFER_PADDING_SIZE); \
187 dst = data; \
188 } while (0)
189
190 int av_dup_packet(AVPacket *pkt)
191 {
192 AVPacket tmp_pkt;
193
194 FF_DISABLE_DEPRECATION_WARNINGS
195 if (!pkt->buf && pkt->data
196 #if FF_API_DESTRUCT_PACKET
197 && !pkt->destruct
198 #endif
199 ) {
200 FF_ENABLE_DEPRECATION_WARNINGS
201 tmp_pkt = *pkt;
202
203 pkt->data = NULL;
204 pkt->side_data = NULL;
205 DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1, ALLOC_BUF);
206 #if FF_API_DESTRUCT_PACKET
207 FF_DISABLE_DEPRECATION_WARNINGS
208 pkt->destruct = dummy_destruct_packet;
209 FF_ENABLE_DEPRECATION_WARNINGS
210 #endif
211
212 if (pkt->side_data_elems) {
213 int i;
214
215 DUP_DATA(pkt->side_data, tmp_pkt.side_data,
216 pkt->side_data_elems * sizeof(*pkt->side_data), 0, ALLOC_MALLOC);
217 memset(pkt->side_data, 0,
218 pkt->side_data_elems * sizeof(*pkt->side_data));
219 for (i = 0; i < pkt->side_data_elems; i++) {
220 DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
221 tmp_pkt.side_data[i].size, 1, ALLOC_MALLOC);
222 pkt->side_data[i].size = tmp_pkt.side_data[i].size;
223 pkt->side_data[i].type = tmp_pkt.side_data[i].type;
224 }
225 }
226 }
227 return 0;
228
229 failed_alloc:
230 av_free_packet(pkt);
231 return AVERROR(ENOMEM);
232 }
233
234 void av_packet_free_side_data(AVPacket *pkt)
235 {
236 int i;
237 for (i = 0; i < pkt->side_data_elems; i++)
238 av_free(pkt->side_data[i].data);
239 av_freep(&pkt->side_data);
240 pkt->side_data_elems = 0;
241 }
242
243 void av_free_packet(AVPacket *pkt)
244 {
245 if (pkt) {
246 FF_DISABLE_DEPRECATION_WARNINGS
247 if (pkt->buf)
248 av_buffer_unref(&pkt->buf);
249 #if FF_API_DESTRUCT_PACKET
250 else if (pkt->destruct)
251 pkt->destruct(pkt);
252 pkt->destruct = NULL;
253 #endif
254 FF_ENABLE_DEPRECATION_WARNINGS
255 pkt->data = NULL;
256 pkt->size = 0;
257
258 av_packet_free_side_data(pkt);
259 }
260 }
261
262 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
263 int size)
264 {
265 int elems = pkt->side_data_elems;
266
267 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
268 return NULL;
269 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
270 return NULL;
271
272 pkt->side_data = av_realloc(pkt->side_data,
273 (elems + 1) * sizeof(*pkt->side_data));
274 if (!pkt->side_data)
275 return NULL;
276
277 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
278 if (!pkt->side_data[elems].data)
279 return NULL;
280 pkt->side_data[elems].size = size;
281 pkt->side_data[elems].type = type;
282 pkt->side_data_elems++;
283
284 return pkt->side_data[elems].data;
285 }
286
287 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
288 int *size)
289 {
290 int i;
291
292 for (i = 0; i < pkt->side_data_elems; i++) {
293 if (pkt->side_data[i].type == type) {
294 if (size)
295 *size = pkt->side_data[i].size;
296 return pkt->side_data[i].data;
297 }
298 }
299 return NULL;
300 }
301
302 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
303 int size)
304 {
305 int i;
306
307 for (i = 0; i < pkt->side_data_elems; i++) {
308 if (pkt->side_data[i].type == type) {
309 if (size > pkt->side_data[i].size)
310 return AVERROR(ENOMEM);
311 pkt->side_data[i].size = size;
312 return 0;
313 }
314 }
315 return AVERROR(ENOENT);
316 }
317
318 int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
319 {
320 int i;
321
322 dst->pts = src->pts;
323 dst->dts = src->dts;
324 dst->pos = src->pos;
325 dst->duration = src->duration;
326 dst->convergence_duration = src->convergence_duration;
327 dst->flags = src->flags;
328 dst->stream_index = src->stream_index;
329
330 for (i = 0; i < src->side_data_elems; i++) {
331 enum AVPacketSideDataType type = src->side_data[i].type;
332 int size = src->side_data[i].size;
333 uint8_t *src_data = src->side_data[i].data;
334 uint8_t *dst_data = av_packet_new_side_data(dst, type, size);
335
336 if (!dst_data) {
337 av_packet_free_side_data(dst);
338 return AVERROR(ENOMEM);
339 }
340 memcpy(dst_data, src_data, size);
341 }
342
343 return 0;
344 }
345
346 void av_packet_unref(AVPacket *pkt)
347 {
348 av_packet_free_side_data(pkt);
349 av_buffer_unref(&pkt->buf);
350 av_init_packet(pkt);
351 pkt->data = NULL;
352 pkt->size = 0;
353 }
354
355 int av_packet_ref(AVPacket *dst, AVPacket *src)
356 {
357 int ret;
358
359 ret = av_packet_copy_props(dst, src);
360 if (ret < 0)
361 return ret;
362
363 if (!src->buf) {
364 ret = packet_alloc(&dst->buf, src->size);
365 if (ret < 0)
366 goto fail;
367 memcpy(dst->buf->data, src->data, src->size);
368 } else {
369 dst->buf = av_buffer_ref(src->buf);
370 if (!dst->buf) {
371 ret = AVERROR(ENOMEM);
372 goto fail;
373 }
374 }
375
376 dst->size = src->size;
377 dst->data = dst->buf->data;
378 return 0;
379 fail:
380 av_packet_free_side_data(dst);
381 return ret;
382 }
383
384 void av_packet_move_ref(AVPacket *dst, AVPacket *src)
385 {
386 *dst = *src;
387 av_init_packet(src);
388 }
389
390 void av_packet_rescale_ts(AVPacket *pkt, AVRational src_tb, AVRational dst_tb)
391 {
392 if (pkt->pts != AV_NOPTS_VALUE)
393 pkt->pts = av_rescale_q(pkt->pts, src_tb, dst_tb);
394 if (pkt->dts != AV_NOPTS_VALUE)
395 pkt->dts = av_rescale_q(pkt->dts, src_tb, dst_tb);
396 if (pkt->duration > 0)
397 pkt->duration = av_rescale_q(pkt->duration, src_tb, dst_tb);
398 if (pkt->convergence_duration > 0)
399 pkt->convergence_duration = av_rescale_q(pkt->convergence_duration, src_tb, dst_tb);
400 }