2 * AVPacket functions for libavcodec
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of Libav.
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.
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.
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
24 #include "libavutil/avassert.h"
25 #include "libavutil/common.h"
26 #include "libavutil/internal.h"
27 #include "libavutil/mem.h"
29 #if FF_API_DESTRUCT_PACKET
31 void av_destruct_packet(AVPacket *pkt)
38 /* a dummy destruct callback for the callers that assume AVPacket.destruct ==
39 * NULL => static data */
40 static void dummy_destruct_packet(AVPacket *pkt)
46 void av_init_packet(AVPacket *pkt)
48 pkt->pts = AV_NOPTS_VALUE;
49 pkt->dts = AV_NOPTS_VALUE;
52 pkt->convergence_duration = 0;
54 pkt->stream_index = 0;
55 #if FF_API_DESTRUCT_PACKET
56 FF_DISABLE_DEPRECATION_WARNINGS
58 FF_ENABLE_DEPRECATION_WARNINGS
61 pkt->side_data = NULL;
62 pkt->side_data_elems = 0;
65 static int packet_alloc(AVBufferRef **buf, int size)
68 if ((unsigned)size >= (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
69 return AVERROR(EINVAL);
71 ret = av_buffer_realloc(buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
75 memset((*buf)->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
80 int av_new_packet(AVPacket *pkt, int size)
82 AVBufferRef *buf = NULL;
83 int ret = packet_alloc(&buf, size);
89 pkt->data = buf->data;
91 #if FF_API_DESTRUCT_PACKET
92 FF_DISABLE_DEPRECATION_WARNINGS
93 pkt->destruct = dummy_destruct_packet;
94 FF_ENABLE_DEPRECATION_WARNINGS
100 void av_shrink_packet(AVPacket *pkt, int size)
102 if (pkt->size <= size)
105 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
108 int av_grow_packet(AVPacket *pkt, int grow_by)
111 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
113 return av_new_packet(pkt, grow_by);
114 if ((unsigned)grow_by >
115 INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
118 new_size = pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE;
120 int ret = av_buffer_realloc(&pkt->buf, new_size);
124 pkt->buf = av_buffer_alloc(new_size);
126 return AVERROR(ENOMEM);
127 memcpy(pkt->buf->data, pkt->data, FFMIN(pkt->size, pkt->size + grow_by));
128 #if FF_API_DESTRUCT_PACKET
129 FF_DISABLE_DEPRECATION_WARNINGS
130 pkt->destruct = dummy_destruct_packet;
131 FF_ENABLE_DEPRECATION_WARNINGS
134 pkt->data = pkt->buf->data;
135 pkt->size += grow_by;
136 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
141 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
143 if (size >= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
144 return AVERROR(EINVAL);
146 pkt->buf = av_buffer_create(data, size + FF_INPUT_BUFFER_PADDING_SIZE,
147 av_buffer_default_free, NULL, 0);
149 return AVERROR(ENOMEM);
153 #if FF_API_DESTRUCT_PACKET
154 FF_DISABLE_DEPRECATION_WARNINGS
155 pkt->destruct = dummy_destruct_packet;
156 FF_ENABLE_DEPRECATION_WARNINGS
162 #define ALLOC_MALLOC(data, size) data = av_malloc(size)
163 #define ALLOC_BUF(data, size) \
165 av_buffer_realloc(&pkt->buf, size); \
166 data = pkt->buf ? pkt->buf->data : NULL; \
169 #define DUP_DATA(dst, src, size, padding, ALLOC) \
173 if ((unsigned)(size) > \
174 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
176 ALLOC(data, size + FF_INPUT_BUFFER_PADDING_SIZE); \
182 memcpy(data, src, size); \
184 memset((uint8_t *)data + size, 0, \
185 FF_INPUT_BUFFER_PADDING_SIZE); \
189 int av_dup_packet(AVPacket *pkt)
193 FF_DISABLE_DEPRECATION_WARNINGS
194 if (!pkt->buf && pkt->data
195 #if FF_API_DESTRUCT_PACKET
199 FF_ENABLE_DEPRECATION_WARNINGS
203 pkt->side_data = NULL;
204 DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1, ALLOC_BUF);
205 #if FF_API_DESTRUCT_PACKET
206 FF_DISABLE_DEPRECATION_WARNINGS
207 pkt->destruct = dummy_destruct_packet;
208 FF_ENABLE_DEPRECATION_WARNINGS
211 if (pkt->side_data_elems) {
214 DUP_DATA(pkt->side_data, tmp_pkt.side_data,
215 pkt->side_data_elems * sizeof(*pkt->side_data), 0, ALLOC_MALLOC);
216 memset(pkt->side_data, 0,
217 pkt->side_data_elems * sizeof(*pkt->side_data));
218 for (i = 0; i < pkt->side_data_elems; i++) {
219 DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
220 tmp_pkt.side_data[i].size, 1, ALLOC_MALLOC);
221 pkt->side_data[i].size = tmp_pkt.side_data[i].size;
222 pkt->side_data[i].type = tmp_pkt.side_data[i].type;
230 return AVERROR(ENOMEM);
233 void av_packet_free_side_data(AVPacket *pkt)
236 for (i = 0; i < pkt->side_data_elems; i++)
237 av_free(pkt->side_data[i].data);
238 av_freep(&pkt->side_data);
239 pkt->side_data_elems = 0;
242 void av_free_packet(AVPacket *pkt)
245 FF_DISABLE_DEPRECATION_WARNINGS
247 av_buffer_unref(&pkt->buf);
248 #if FF_API_DESTRUCT_PACKET
249 else if (pkt->destruct)
251 pkt->destruct = NULL;
253 FF_ENABLE_DEPRECATION_WARNINGS
257 av_packet_free_side_data(pkt);
261 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
264 int elems = pkt->side_data_elems;
266 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
268 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
271 pkt->side_data = av_realloc(pkt->side_data,
272 (elems + 1) * sizeof(*pkt->side_data));
276 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
277 if (!pkt->side_data[elems].data)
279 pkt->side_data[elems].size = size;
280 pkt->side_data[elems].type = type;
281 pkt->side_data_elems++;
283 return pkt->side_data[elems].data;
286 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
291 for (i = 0; i < pkt->side_data_elems; i++) {
292 if (pkt->side_data[i].type == type) {
294 *size = pkt->side_data[i].size;
295 return pkt->side_data[i].data;
301 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
306 for (i = 0; i < pkt->side_data_elems; i++) {
307 if (pkt->side_data[i].type == type) {
308 if (size > pkt->side_data[i].size)
309 return AVERROR(ENOMEM);
310 pkt->side_data[i].size = size;
314 return AVERROR(ENOENT);
317 int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
324 dst->duration = src->duration;
325 dst->convergence_duration = src->convergence_duration;
326 dst->flags = src->flags;
327 dst->stream_index = src->stream_index;
328 dst->side_data_elems = src->side_data_elems;
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);
337 av_packet_free_side_data(dst);
338 return AVERROR(ENOMEM);
340 memcpy(dst_data, src_data, size);
346 void av_packet_unref(AVPacket *pkt)
348 av_packet_free_side_data(pkt);
349 av_buffer_unref(&pkt->buf);
355 int av_packet_ref(AVPacket *dst, AVPacket *src)
359 ret = av_packet_copy_props(dst, src);
364 ret = packet_alloc(&dst->buf, src->size);
367 memcpy(dst->buf->data, src->data, src->size);
369 dst->buf = av_buffer_ref(src->buf);
371 dst->size = src->size;
372 dst->data = dst->buf->data;
375 av_packet_free_side_data(dst);
379 void av_packet_move_ref(AVPacket *dst, AVPacket *src)