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
23 #include "libavutil/avassert.h"
24 #include "bytestream.h"
26 void av_destruct_packet_nofree(AVPacket *pkt)
28 pkt->data = NULL; pkt->size = 0;
29 pkt->side_data = NULL;
30 pkt->side_data_elems = 0;
33 void av_destruct_packet(AVPacket *pkt)
38 pkt->data = NULL; pkt->size = 0;
40 for (i = 0; i < pkt->side_data_elems; i++)
41 av_free(pkt->side_data[i].data);
42 av_freep(&pkt->side_data);
43 pkt->side_data_elems = 0;
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;
56 pkt->side_data = NULL;
57 pkt->side_data_elems = 0;
60 int av_new_packet(AVPacket *pkt, int size)
63 if((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
64 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
66 memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
73 pkt->destruct = av_destruct_packet;
75 return AVERROR(ENOMEM);
79 void av_shrink_packet(AVPacket *pkt, int size)
81 if (pkt->size <= size) return;
83 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
86 int av_grow_packet(AVPacket *pkt, int grow_by)
89 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
91 return av_new_packet(pkt, grow_by);
92 if ((unsigned)grow_by > INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
94 new_ptr = av_realloc(pkt->data, pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE);
96 return AVERROR(ENOMEM);
99 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
103 #define DUP_DATA(dst, src, size, padding) \
107 if ((unsigned)(size) > (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
109 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); \
111 data = av_malloc(size); \
115 memcpy(data, src, size); \
117 memset((uint8_t*)data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE); \
121 int av_dup_packet(AVPacket *pkt)
125 if (((pkt->destruct == av_destruct_packet_nofree) || (pkt->destruct == NULL)) && pkt->data) {
129 pkt->side_data = NULL;
130 DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1);
131 pkt->destruct = av_destruct_packet;
133 if (pkt->side_data_elems) {
136 DUP_DATA(pkt->side_data, tmp_pkt.side_data,
137 pkt->side_data_elems * sizeof(*pkt->side_data), 0);
138 memset(pkt->side_data, 0, pkt->side_data_elems * sizeof(*pkt->side_data));
139 for (i = 0; i < pkt->side_data_elems; i++) {
140 DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
141 pkt->side_data[i].size, 1);
147 av_destruct_packet(pkt);
148 return AVERROR(ENOMEM);
151 void av_free_packet(AVPacket *pkt)
154 if (pkt->destruct) pkt->destruct(pkt);
155 pkt->data = NULL; pkt->size = 0;
156 pkt->side_data = NULL;
157 pkt->side_data_elems = 0;
161 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
164 int elems = pkt->side_data_elems;
166 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
168 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
171 pkt->side_data = av_realloc(pkt->side_data, (elems + 1) * sizeof(*pkt->side_data));
175 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
176 if (!pkt->side_data[elems].data)
178 pkt->side_data[elems].size = size;
179 pkt->side_data[elems].type = type;
180 pkt->side_data_elems++;
182 return pkt->side_data[elems].data;
185 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
190 for (i = 0; i < pkt->side_data_elems; i++) {
191 if (pkt->side_data[i].type == type) {
193 *size = pkt->side_data[i].size;
194 return pkt->side_data[i].data;
200 #define FF_MERGE_MARKER 0x8c4d9d108e25e9feULL
202 int av_packet_merge_side_data(AVPacket *pkt){
203 if(pkt->side_data_elems){
206 uint64_t size= pkt->size + 8LL + FF_INPUT_BUFFER_PADDING_SIZE;
208 for (i=0; i<old.side_data_elems; i++) {
209 size += old.side_data[i].size + 5LL;
212 return AVERROR(EINVAL);
215 return AVERROR(ENOMEM);
217 pkt->destruct = av_destruct_packet;
218 pkt->size = size - FF_INPUT_BUFFER_PADDING_SIZE;
219 bytestream_put_buffer(&p, old.data, old.size);
220 for (i=old.side_data_elems-1; i>=0; i--) {
221 bytestream_put_buffer(&p, old.side_data[i].data, old.side_data[i].size);
222 bytestream_put_be32(&p, old.side_data[i].size);
223 *p++ = old.side_data[i].type | ((i==old.side_data_elems-1)*128);
225 bytestream_put_be64(&p, FF_MERGE_MARKER);
226 av_assert0(p-pkt->data == pkt->size);
227 memset(p, 0, FF_INPUT_BUFFER_PADDING_SIZE);
228 av_free_packet(&old);
229 pkt->side_data_elems = 0;
230 pkt->side_data = NULL;
236 int av_packet_split_side_data(AVPacket *pkt){
237 if (!pkt->side_data_elems && pkt->size >12 && AV_RB64(pkt->data + pkt->size - 8) == FF_MERGE_MARKER){
240 uint8_t *p= pkt->data + pkt->size - 8 - 5;
246 if (size>INT_MAX || p - pkt->data <= size)
253 pkt->side_data = av_malloc(i * sizeof(*pkt->side_data));
255 return AVERROR(ENOMEM);
257 p= pkt->data + pkt->size - 8 - 5;
260 av_assert0(size<=INT_MAX && p - pkt->data > size);
261 pkt->side_data[i].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
262 pkt->side_data[i].size = size;
263 pkt->side_data[i].type = p[4]&127;
264 if (!pkt->side_data[i].data)
265 return AVERROR(ENOMEM);
266 memcpy(pkt->side_data[i].data, p-size, size);
267 pkt->size -= size + 5;
273 pkt->side_data_elems = i+1;