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"
30 #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 int av_new_packet(AVPacket *pkt, int size)
67 AVBufferRef *buf = NULL;
69 if ((unsigned)size >= (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
70 return AVERROR(EINVAL);
72 av_buffer_realloc(&buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
74 return AVERROR(ENOMEM);
76 memset(buf->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
80 pkt->data = buf->data;
82 #if FF_API_DESTRUCT_PACKET
83 FF_DISABLE_DEPRECATION_WARNINGS
84 pkt->destruct = dummy_destruct_packet;
85 FF_ENABLE_DEPRECATION_WARNINGS
91 void av_shrink_packet(AVPacket *pkt, int size)
93 if (pkt->size <= size)
96 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
99 int av_grow_packet(AVPacket *pkt, int grow_by)
102 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
104 return av_new_packet(pkt, grow_by);
105 if ((unsigned)grow_by >
106 INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
109 new_size = pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE;
111 int ret = av_buffer_realloc(&pkt->buf, new_size);
115 pkt->buf = av_buffer_alloc(new_size);
117 return AVERROR(ENOMEM);
118 memcpy(pkt->buf->data, pkt->data, FFMIN(pkt->size, pkt->size + grow_by));
119 #if FF_API_DESTRUCT_PACKET
120 FF_DISABLE_DEPRECATION_WARNINGS
121 pkt->destruct = dummy_destruct_packet;
122 FF_ENABLE_DEPRECATION_WARNINGS
125 pkt->data = pkt->buf->data;
126 pkt->size += grow_by;
127 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
132 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
134 if (size >= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
135 return AVERROR(EINVAL);
137 pkt->buf = av_buffer_create(data, size + FF_INPUT_BUFFER_PADDING_SIZE,
138 av_buffer_default_free, NULL, 0);
140 return AVERROR(ENOMEM);
144 #if FF_API_DESTRUCT_PACKET
145 FF_DISABLE_DEPRECATION_WARNINGS
146 pkt->destruct = dummy_destruct_packet;
147 FF_ENABLE_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) + FF_INPUT_BUFFER_PADDING_SIZE) \
167 ALLOC(data, size + FF_INPUT_BUFFER_PADDING_SIZE); \
173 memcpy(data, src, size); \
175 memset((uint8_t *)data + size, 0, \
176 FF_INPUT_BUFFER_PADDING_SIZE); \
180 int av_dup_packet(AVPacket *pkt)
184 FF_DISABLE_DEPRECATION_WARNINGS
185 if (!pkt->buf && pkt->data
186 #if FF_API_DESTRUCT_PACKET
190 FF_ENABLE_DEPRECATION_WARNINGS
194 pkt->side_data = NULL;
195 DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1, ALLOC_BUF);
196 #if FF_API_DESTRUCT_PACKET
197 FF_DISABLE_DEPRECATION_WARNINGS
198 pkt->destruct = dummy_destruct_packet;
199 FF_ENABLE_DEPRECATION_WARNINGS
202 if (pkt->side_data_elems) {
205 DUP_DATA(pkt->side_data, tmp_pkt.side_data,
206 pkt->side_data_elems * sizeof(*pkt->side_data), 0, ALLOC_MALLOC);
207 memset(pkt->side_data, 0,
208 pkt->side_data_elems * sizeof(*pkt->side_data));
209 for (i = 0; i < pkt->side_data_elems; i++) {
210 DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
211 tmp_pkt.side_data[i].size, 1, ALLOC_MALLOC);
212 pkt->side_data[i].size = tmp_pkt.side_data[i].size;
213 pkt->side_data[i].type = tmp_pkt.side_data[i].type;
221 return AVERROR(ENOMEM);
224 void av_free_packet(AVPacket *pkt)
229 FF_DISABLE_DEPRECATION_WARNINGS
231 av_buffer_unref(&pkt->buf);
232 #if FF_API_DESTRUCT_PACKET
233 else if (pkt->destruct)
235 pkt->destruct = NULL;
237 FF_ENABLE_DEPRECATION_WARNINGS
241 for (i = 0; i < pkt->side_data_elems; i++)
242 av_free(pkt->side_data[i].data);
243 av_freep(&pkt->side_data);
244 pkt->side_data_elems = 0;
248 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
251 int elems = pkt->side_data_elems;
253 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
255 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
258 pkt->side_data = av_realloc(pkt->side_data,
259 (elems + 1) * sizeof(*pkt->side_data));
263 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
264 if (!pkt->side_data[elems].data)
266 pkt->side_data[elems].size = size;
267 pkt->side_data[elems].type = type;
268 pkt->side_data_elems++;
270 return pkt->side_data[elems].data;
273 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
278 for (i = 0; i < pkt->side_data_elems; i++) {
279 if (pkt->side_data[i].type == type) {
281 *size = pkt->side_data[i].size;
282 return pkt->side_data[i].data;
288 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
293 for (i = 0; i < pkt->side_data_elems; i++) {
294 if (pkt->side_data[i].type == type) {
295 if (size > pkt->side_data[i].size)
296 return AVERROR(ENOMEM);
297 pkt->side_data[i].size = size;
301 return AVERROR(ENOENT);