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 "bytestream.h"
27 void av_destruct_packet_nofree(AVPacket *pkt)
29 pkt->data = NULL; pkt->size = 0;
30 pkt->side_data = NULL;
31 pkt->side_data_elems = 0;
34 void ff_packet_free_side_data(AVPacket *pkt)
37 for (i = 0; i < pkt->side_data_elems; i++)
38 av_free(pkt->side_data[i].data);
39 av_freep(&pkt->side_data);
40 pkt->side_data_elems = 0;
43 void av_destruct_packet(AVPacket *pkt)
46 pkt->data = NULL; pkt->size = 0;
48 ff_packet_free_side_data(pkt);
51 void av_init_packet(AVPacket *pkt)
53 pkt->pts = AV_NOPTS_VALUE;
54 pkt->dts = AV_NOPTS_VALUE;
57 pkt->convergence_duration = 0;
59 pkt->stream_index = 0;
61 pkt->side_data = NULL;
62 pkt->side_data_elems = 0;
65 int av_new_packet(AVPacket *pkt, int size)
68 if((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
69 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
71 memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
78 pkt->destruct = av_destruct_packet;
80 return AVERROR(ENOMEM);
84 void av_shrink_packet(AVPacket *pkt, int size)
86 if (pkt->size <= size) return;
88 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
91 int av_grow_packet(AVPacket *pkt, int grow_by)
94 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
96 return av_new_packet(pkt, grow_by);
97 if ((unsigned)grow_by > INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
99 new_ptr = av_realloc(pkt->data, pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE);
101 return AVERROR(ENOMEM);
103 pkt->size += grow_by;
104 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
108 #define DUP_DATA(dst, src, size, padding) \
112 if ((unsigned)(size) > (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
114 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); \
116 data = av_malloc(size); \
120 memcpy(data, src, size); \
122 memset((uint8_t*)data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE); \
126 int av_dup_packet(AVPacket *pkt)
130 if (((pkt->destruct == av_destruct_packet_nofree) || (pkt->destruct == NULL)) && pkt->data) {
134 pkt->side_data = NULL;
135 DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1);
136 pkt->destruct = av_destruct_packet;
138 if (pkt->side_data_elems) {
141 DUP_DATA(pkt->side_data, tmp_pkt.side_data,
142 pkt->side_data_elems * sizeof(*pkt->side_data), 0);
143 memset(pkt->side_data, 0, pkt->side_data_elems * sizeof(*pkt->side_data));
144 for (i = 0; i < pkt->side_data_elems; i++) {
145 DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
146 pkt->side_data[i].size, 1);
152 av_destruct_packet(pkt);
153 return AVERROR(ENOMEM);
156 void av_free_packet(AVPacket *pkt)
159 if (pkt->destruct) pkt->destruct(pkt);
160 pkt->data = NULL; pkt->size = 0;
161 pkt->side_data = NULL;
162 pkt->side_data_elems = 0;
166 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
169 int elems = pkt->side_data_elems;
171 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
173 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
176 pkt->side_data = av_realloc(pkt->side_data, (elems + 1) * sizeof(*pkt->side_data));
180 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
181 if (!pkt->side_data[elems].data)
183 pkt->side_data[elems].size = size;
184 pkt->side_data[elems].type = type;
185 pkt->side_data_elems++;
187 return pkt->side_data[elems].data;
190 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
195 for (i = 0; i < pkt->side_data_elems; i++) {
196 if (pkt->side_data[i].type == type) {
198 *size = pkt->side_data[i].size;
199 return pkt->side_data[i].data;
205 #define FF_MERGE_MARKER 0x8c4d9d108e25e9feULL
207 int av_packet_merge_side_data(AVPacket *pkt){
208 if(pkt->side_data_elems){
211 uint64_t size= pkt->size + 8LL + FF_INPUT_BUFFER_PADDING_SIZE;
213 for (i=0; i<old.side_data_elems; i++) {
214 size += old.side_data[i].size + 5LL;
217 return AVERROR(EINVAL);
220 return AVERROR(ENOMEM);
222 pkt->destruct = av_destruct_packet;
223 pkt->size = size - FF_INPUT_BUFFER_PADDING_SIZE;
224 bytestream_put_buffer(&p, old.data, old.size);
225 for (i=old.side_data_elems-1; i>=0; i--) {
226 bytestream_put_buffer(&p, old.side_data[i].data, old.side_data[i].size);
227 bytestream_put_be32(&p, old.side_data[i].size);
228 *p++ = old.side_data[i].type | ((i==old.side_data_elems-1)*128);
230 bytestream_put_be64(&p, FF_MERGE_MARKER);
231 av_assert0(p-pkt->data == pkt->size);
232 memset(p, 0, FF_INPUT_BUFFER_PADDING_SIZE);
233 av_free_packet(&old);
234 pkt->side_data_elems = 0;
235 pkt->side_data = NULL;
241 int av_packet_split_side_data(AVPacket *pkt){
242 if (!pkt->side_data_elems && pkt->size >12 && AV_RB64(pkt->data + pkt->size - 8) == FF_MERGE_MARKER){
247 p = pkt->data + pkt->size - 8 - 5;
250 if (size>INT_MAX || p - pkt->data <= size)
257 pkt->side_data = av_malloc(i * sizeof(*pkt->side_data));
259 return AVERROR(ENOMEM);
261 p= pkt->data + pkt->size - 8 - 5;
264 av_assert0(size<=INT_MAX && p - pkt->data > size);
265 pkt->side_data[i].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
266 pkt->side_data[i].size = size;
267 pkt->side_data[i].type = p[4]&127;
268 if (!pkt->side_data[i].data)
269 return AVERROR(ENOMEM);
270 memcpy(pkt->side_data[i].data, p-size, size);
271 pkt->size -= size + 5;
277 pkt->side_data_elems = i+1;