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/mathematics.h"
28 #include "libavutil/mem.h"
31 void av_init_packet(AVPacket *pkt)
33 pkt->pts = AV_NOPTS_VALUE;
34 pkt->dts = AV_NOPTS_VALUE;
37 #if FF_API_CONVERGENCE_DURATION
38 FF_DISABLE_DEPRECATION_WARNINGS
39 pkt->convergence_duration = 0;
40 FF_ENABLE_DEPRECATION_WARNINGS
43 pkt->stream_index = 0;
45 pkt->side_data = NULL;
46 pkt->side_data_elems = 0;
49 AVPacket *av_packet_alloc(void)
51 AVPacket *pkt = av_mallocz(sizeof(AVPacket));
60 void av_packet_free(AVPacket **pkt)
65 av_packet_unref(*pkt);
69 static int packet_alloc(AVBufferRef **buf, int size)
72 if (size < 0 || size >= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
73 return AVERROR(EINVAL);
75 ret = av_buffer_realloc(buf, size + AV_INPUT_BUFFER_PADDING_SIZE);
79 memset((*buf)->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
84 int av_new_packet(AVPacket *pkt, int size)
86 AVBufferRef *buf = NULL;
87 int ret = packet_alloc(&buf, size);
93 pkt->data = buf->data;
99 void av_shrink_packet(AVPacket *pkt, int size)
101 if (pkt->size <= size)
104 memset(pkt->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
107 int av_grow_packet(AVPacket *pkt, int grow_by)
110 av_assert0((unsigned)pkt->size <= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE);
112 return av_new_packet(pkt, grow_by);
113 if ((unsigned)grow_by >
114 INT_MAX - (pkt->size + AV_INPUT_BUFFER_PADDING_SIZE))
117 new_size = pkt->size + grow_by + AV_INPUT_BUFFER_PADDING_SIZE;
119 int ret = av_buffer_realloc(&pkt->buf, new_size);
123 pkt->buf = av_buffer_alloc(new_size);
125 return AVERROR(ENOMEM);
126 memcpy(pkt->buf->data, pkt->data, FFMIN(pkt->size, pkt->size + grow_by));
128 pkt->data = pkt->buf->data;
129 pkt->size += grow_by;
130 memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
135 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
137 if (size >= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
138 return AVERROR(EINVAL);
140 pkt->buf = av_buffer_create(data, size + AV_INPUT_BUFFER_PADDING_SIZE,
141 av_buffer_default_free, NULL, 0);
143 return AVERROR(ENOMEM);
151 #if FF_API_AVPACKET_OLD_API
152 FF_DISABLE_DEPRECATION_WARNINGS
153 #define ALLOC_MALLOC(data, size) data = av_malloc(size)
154 #define ALLOC_BUF(data, size) \
156 av_buffer_realloc(&pkt->buf, size); \
157 data = pkt->buf ? pkt->buf->data : NULL; \
160 #define DUP_DATA(dst, src, size, padding, ALLOC) \
164 if ((unsigned)(size) > \
165 (unsigned)(size) + AV_INPUT_BUFFER_PADDING_SIZE) \
167 ALLOC(data, size + AV_INPUT_BUFFER_PADDING_SIZE); \
173 memcpy(data, src, size); \
175 memset((uint8_t *)data + size, 0, \
176 AV_INPUT_BUFFER_PADDING_SIZE); \
180 int av_dup_packet(AVPacket *pkt)
184 if (!pkt->buf && pkt->data) {
188 pkt->side_data = NULL;
189 DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1, ALLOC_BUF);
191 if (pkt->side_data_elems) {
194 DUP_DATA(pkt->side_data, tmp_pkt.side_data,
195 pkt->side_data_elems * sizeof(*pkt->side_data), 0, ALLOC_MALLOC);
196 memset(pkt->side_data, 0,
197 pkt->side_data_elems * sizeof(*pkt->side_data));
198 for (i = 0; i < pkt->side_data_elems; i++) {
199 DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
200 tmp_pkt.side_data[i].size, 1, ALLOC_MALLOC);
201 pkt->side_data[i].size = tmp_pkt.side_data[i].size;
202 pkt->side_data[i].type = tmp_pkt.side_data[i].type;
209 av_packet_unref(pkt);
210 return AVERROR(ENOMEM);
212 FF_ENABLE_DEPRECATION_WARNINGS
215 void av_packet_free_side_data(AVPacket *pkt)
218 for (i = 0; i < pkt->side_data_elems; i++)
219 av_free(pkt->side_data[i].data);
220 av_freep(&pkt->side_data);
221 pkt->side_data_elems = 0;
224 #if FF_API_AVPACKET_OLD_API
225 FF_DISABLE_DEPRECATION_WARNINGS
226 void av_free_packet(AVPacket *pkt)
230 av_buffer_unref(&pkt->buf);
234 av_packet_free_side_data(pkt);
237 FF_ENABLE_DEPRECATION_WARNINGS
240 int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
241 uint8_t *data, size_t size)
243 AVPacketSideData *tmp;
244 int elems = pkt->side_data_elems;
246 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
247 return AVERROR(ERANGE);
249 tmp = av_realloc(pkt->side_data, (elems + 1) * sizeof(*tmp));
251 return AVERROR(ENOMEM);
253 pkt->side_data = tmp;
254 pkt->side_data[elems].data = data;
255 pkt->side_data[elems].size = size;
256 pkt->side_data[elems].type = type;
257 pkt->side_data_elems++;
263 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
269 if (!size || (unsigned)size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
271 data = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
275 ret = av_packet_add_side_data(pkt, type, data, size);
284 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
289 for (i = 0; i < pkt->side_data_elems; i++) {
290 if (pkt->side_data[i].type == type) {
292 *size = pkt->side_data[i].size;
293 return pkt->side_data[i].data;
299 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
304 for (i = 0; i < pkt->side_data_elems; i++) {
305 if (pkt->side_data[i].type == type) {
306 if (size > pkt->side_data[i].size)
307 return AVERROR(ENOMEM);
308 pkt->side_data[i].size = size;
312 return AVERROR(ENOENT);
315 int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
322 dst->duration = src->duration;
323 #if FF_API_CONVERGENCE_DURATION
324 FF_DISABLE_DEPRECATION_WARNINGS
325 dst->convergence_duration = src->convergence_duration;
326 FF_ENABLE_DEPRECATION_WARNINGS
328 dst->flags = src->flags;
329 dst->stream_index = src->stream_index;
331 for (i = 0; i < src->side_data_elems; i++) {
332 enum AVPacketSideDataType type = src->side_data[i].type;
333 int size = src->side_data[i].size;
334 uint8_t *src_data = src->side_data[i].data;
335 uint8_t *dst_data = av_packet_new_side_data(dst, type, size);
338 av_packet_free_side_data(dst);
339 return AVERROR(ENOMEM);
341 memcpy(dst_data, src_data, size);
347 void av_packet_unref(AVPacket *pkt)
349 av_packet_free_side_data(pkt);
350 av_buffer_unref(&pkt->buf);
356 int av_packet_ref(AVPacket *dst, const AVPacket *src)
360 ret = av_packet_copy_props(dst, src);
365 ret = packet_alloc(&dst->buf, src->size);
368 memcpy(dst->buf->data, src->data, src->size);
370 dst->data = dst->buf->data;
372 dst->buf = av_buffer_ref(src->buf);
374 ret = AVERROR(ENOMEM);
377 dst->data = src->data;
380 dst->size = src->size;
384 av_packet_free_side_data(dst);
388 AVPacket *av_packet_clone(const AVPacket *src)
390 AVPacket *ret = av_packet_alloc();
395 if (av_packet_ref(ret, src))
396 av_packet_free(&ret);
401 void av_packet_move_ref(AVPacket *dst, AVPacket *src)
409 void av_packet_rescale_ts(AVPacket *pkt, AVRational src_tb, AVRational dst_tb)
411 if (pkt->pts != AV_NOPTS_VALUE)
412 pkt->pts = av_rescale_q(pkt->pts, src_tb, dst_tb);
413 if (pkt->dts != AV_NOPTS_VALUE)
414 pkt->dts = av_rescale_q(pkt->dts, src_tb, dst_tb);
415 if (pkt->duration > 0)
416 pkt->duration = av_rescale_q(pkt->duration, src_tb, dst_tb);
417 #if FF_API_CONVERGENCE_DURATION
418 FF_DISABLE_DEPRECATION_WARNINGS
419 if (pkt->convergence_duration > 0)
420 pkt->convergence_duration = av_rescale_q(pkt->convergence_duration, src_tb, dst_tb);
421 FF_ENABLE_DEPRECATION_WARNINGS