2 * AVPacket functions for libavcodec
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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/mem.h"
28 #include "bytestream.h"
31 void ff_packet_free_side_data(AVPacket *pkt)
34 for (i = 0; i < pkt->side_data_elems; i++)
35 av_free(pkt->side_data[i].data);
36 av_freep(&pkt->side_data);
37 pkt->side_data_elems = 0;
40 #if FF_API_DESTRUCT_PACKET
41 void av_destruct_packet(AVPacket *pkt)
48 /* a dummy destruct callback for the callers that assume AVPacket.destruct ==
49 * NULL => static data */
50 static void dummy_destruct_packet(AVPacket *pkt)
56 void av_init_packet(AVPacket *pkt)
58 pkt->pts = AV_NOPTS_VALUE;
59 pkt->dts = AV_NOPTS_VALUE;
62 pkt->convergence_duration = 0;
64 pkt->stream_index = 0;
65 #if FF_API_DESTRUCT_PACKET
69 pkt->side_data = NULL;
70 pkt->side_data_elems = 0;
73 int av_new_packet(AVPacket *pkt, int size)
75 AVBufferRef *buf = NULL;
77 if ((unsigned)size >= (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
78 return AVERROR(EINVAL);
80 av_buffer_realloc(&buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
82 return AVERROR(ENOMEM);
84 memset(buf->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
88 pkt->data = buf->data;
90 #if FF_API_DESTRUCT_PACKET
91 pkt->destruct = dummy_destruct_packet;
97 void av_shrink_packet(AVPacket *pkt, int size)
99 if (pkt->size <= size)
102 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
105 int av_grow_packet(AVPacket *pkt, int grow_by)
108 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
110 return av_new_packet(pkt, grow_by);
111 if ((unsigned)grow_by >
112 INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
115 new_size = pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE;
117 int ret = av_buffer_realloc(&pkt->buf, new_size);
121 pkt->buf = av_buffer_alloc(new_size);
123 return AVERROR(ENOMEM);
124 memcpy(pkt->buf->data, pkt->data, FFMIN(pkt->size, pkt->size + grow_by));
125 #if FF_API_DESTRUCT_PACKET
126 pkt->destruct = dummy_destruct_packet;
129 pkt->data = pkt->buf->data;
130 pkt->size += grow_by;
131 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
136 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
138 if (size >= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
139 return AVERROR(EINVAL);
141 pkt->buf = av_buffer_create(data, size + FF_INPUT_BUFFER_PADDING_SIZE,
142 av_buffer_default_free, NULL, 0);
144 return AVERROR(ENOMEM);
148 #if FF_API_DESTRUCT_PACKET
149 pkt->destruct = dummy_destruct_packet;
155 #define ALLOC_MALLOC(data, size) data = av_malloc(size)
156 #define ALLOC_BUF(data, size) \
158 av_buffer_realloc(&pkt->buf, size); \
159 data = pkt->buf ? pkt->buf->data : NULL; \
162 #define DUP_DATA(dst, src, size, padding, ALLOC) \
166 if ((unsigned)(size) > \
167 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
169 ALLOC(data, size + FF_INPUT_BUFFER_PADDING_SIZE); \
175 memcpy(data, src, size); \
177 memset((uint8_t *)data + size, 0, \
178 FF_INPUT_BUFFER_PADDING_SIZE); \
182 /* Makes duplicates of data, side_data, but does not copy any other fields */
183 static int copy_packet_data(AVPacket *pkt, AVPacket *src)
186 pkt->side_data = NULL;
188 AVBufferRef *ref = av_buffer_ref(src->buf);
190 return AVERROR(ENOMEM);
192 pkt->data = ref->data;
194 DUP_DATA(pkt->data, src->data, pkt->size, 1, ALLOC_BUF);
196 #if FF_API_DESTRUCT_PACKET
197 pkt->destruct = dummy_destruct_packet;
200 if (pkt->side_data_elems) {
203 DUP_DATA(pkt->side_data, src->side_data,
204 pkt->side_data_elems * sizeof(*pkt->side_data), 0, ALLOC_MALLOC);
205 memset(pkt->side_data, 0,
206 pkt->side_data_elems * sizeof(*pkt->side_data));
207 for (i = 0; i < pkt->side_data_elems; i++) {
208 DUP_DATA(pkt->side_data[i].data, src->side_data[i].data,
209 src->side_data[i].size, 1, ALLOC_MALLOC);
210 pkt->side_data[i].size = src->side_data[i].size;
211 pkt->side_data[i].type = src->side_data[i].type;
217 av_destruct_packet(pkt);
218 return AVERROR(ENOMEM);
221 int av_dup_packet(AVPacket *pkt)
225 if (!pkt->buf && pkt->data
226 #if FF_API_DESTRUCT_PACKET
231 return copy_packet_data(pkt, &tmp_pkt);
236 int av_copy_packet(AVPacket *dst, AVPacket *src)
239 return copy_packet_data(dst, src);
242 void av_free_packet(AVPacket *pkt)
248 av_buffer_unref(&pkt->buf);
249 #if FF_API_DESTRUCT_PACKET
250 else if (pkt->destruct)
252 pkt->destruct = NULL;
257 for (i = 0; i < pkt->side_data_elems; i++)
258 av_free(pkt->side_data[i].data);
259 av_freep(&pkt->side_data);
260 pkt->side_data_elems = 0;
264 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
267 int elems = pkt->side_data_elems;
269 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
271 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
274 pkt->side_data = av_realloc(pkt->side_data,
275 (elems + 1) * sizeof(*pkt->side_data));
279 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
280 if (!pkt->side_data[elems].data)
282 pkt->side_data[elems].size = size;
283 pkt->side_data[elems].type = type;
284 pkt->side_data_elems++;
286 return pkt->side_data[elems].data;
289 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
294 for (i = 0; i < pkt->side_data_elems; i++) {
295 if (pkt->side_data[i].type == type) {
297 *size = pkt->side_data[i].size;
298 return pkt->side_data[i].data;
304 #define FF_MERGE_MARKER 0x8c4d9d108e25e9feULL
306 int av_packet_merge_side_data(AVPacket *pkt){
307 if(pkt->side_data_elems){
311 uint64_t size= pkt->size + 8LL + FF_INPUT_BUFFER_PADDING_SIZE;
313 for (i=0; i<old.side_data_elems; i++) {
314 size += old.side_data[i].size + 5LL;
317 return AVERROR(EINVAL);
318 buf = av_buffer_alloc(size);
320 return AVERROR(ENOMEM);
322 pkt->data = p = buf->data;
323 #if FF_API_DESTRUCT_PACKET
324 pkt->destruct = dummy_destruct_packet;
326 pkt->size = size - FF_INPUT_BUFFER_PADDING_SIZE;
327 bytestream_put_buffer(&p, old.data, old.size);
328 for (i=old.side_data_elems-1; i>=0; i--) {
329 bytestream_put_buffer(&p, old.side_data[i].data, old.side_data[i].size);
330 bytestream_put_be32(&p, old.side_data[i].size);
331 *p++ = old.side_data[i].type | ((i==old.side_data_elems-1)*128);
333 bytestream_put_be64(&p, FF_MERGE_MARKER);
334 av_assert0(p-pkt->data == pkt->size);
335 memset(p, 0, FF_INPUT_BUFFER_PADDING_SIZE);
336 av_free_packet(&old);
337 pkt->side_data_elems = 0;
338 pkt->side_data = NULL;
344 int av_packet_split_side_data(AVPacket *pkt){
345 if (!pkt->side_data_elems && pkt->size >12 && AV_RB64(pkt->data + pkt->size - 8) == FF_MERGE_MARKER){
350 p = pkt->data + pkt->size - 8 - 5;
353 if (size>INT_MAX || p - pkt->data < size)
360 pkt->side_data = av_malloc(i * sizeof(*pkt->side_data));
362 return AVERROR(ENOMEM);
364 p= pkt->data + pkt->size - 8 - 5;
367 av_assert0(size<=INT_MAX && p - pkt->data >= size);
368 pkt->side_data[i].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
369 pkt->side_data[i].size = size;
370 pkt->side_data[i].type = p[4]&127;
371 if (!pkt->side_data[i].data)
372 return AVERROR(ENOMEM);
373 memcpy(pkt->side_data[i].data, p-size, size);
374 pkt->size -= size + 5;
380 pkt->side_data_elems = i+1;
386 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
391 for (i = 0; i < pkt->side_data_elems; i++) {
392 if (pkt->side_data[i].type == type) {
393 if (size > pkt->side_data[i].size)
394 return AVERROR(ENOMEM);
395 pkt->side_data[i].size = size;
399 return AVERROR(ENOENT);