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/mem.h"
29 #if FF_API_DESTRUCT_PACKET
30 void av_destruct_packet(AVPacket *pkt)
37 /* a dummy destruct callback for the callers that assume AVPacket.destruct ==
38 * NULL => static data */
39 static void dummy_destruct_packet(AVPacket *pkt)
45 void av_init_packet(AVPacket *pkt)
47 pkt->pts = AV_NOPTS_VALUE;
48 pkt->dts = AV_NOPTS_VALUE;
51 pkt->convergence_duration = 0;
53 pkt->stream_index = 0;
54 #if FF_API_DESTRUCT_PACKET
58 pkt->side_data = NULL;
59 pkt->side_data_elems = 0;
62 int av_new_packet(AVPacket *pkt, int size)
64 AVBufferRef *buf = NULL;
66 if ((unsigned)size >= (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
67 return AVERROR(EINVAL);
69 av_buffer_realloc(&buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
71 return AVERROR(ENOMEM);
73 memset(buf->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
77 pkt->data = buf->data;
79 #if FF_API_DESTRUCT_PACKET
80 pkt->destruct = dummy_destruct_packet;
86 void av_shrink_packet(AVPacket *pkt, int size)
88 if (pkt->size <= size)
91 memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
94 int av_grow_packet(AVPacket *pkt, int grow_by)
97 av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
99 return av_new_packet(pkt, grow_by);
100 if ((unsigned)grow_by >
101 INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
104 new_size = pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE;
106 int ret = av_buffer_realloc(&pkt->buf, new_size);
110 pkt->buf = av_buffer_alloc(new_size);
112 return AVERROR(ENOMEM);
113 memcpy(pkt->buf->data, pkt->data, FFMIN(pkt->size, pkt->size + grow_by));
114 #if FF_API_DESTRUCT_PACKET
115 pkt->destruct = dummy_destruct_packet;
118 pkt->data = pkt->buf->data;
119 pkt->size += grow_by;
120 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
125 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
127 if (size >= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
128 return AVERROR(EINVAL);
130 pkt->buf = av_buffer_create(data, size + FF_INPUT_BUFFER_PADDING_SIZE,
131 av_buffer_default_free, NULL, 0);
133 return AVERROR(ENOMEM);
137 #if FF_API_DESTRUCT_PACKET
138 pkt->destruct = dummy_destruct_packet;
144 #define ALLOC_MALLOC(data, size) data = av_malloc(size)
145 #define ALLOC_BUF(data, size) \
147 av_buffer_realloc(&pkt->buf, size); \
148 data = pkt->buf ? pkt->buf->data : NULL; \
151 #define DUP_DATA(dst, src, size, padding, ALLOC) \
155 if ((unsigned)(size) > \
156 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE) \
158 ALLOC(data, size + FF_INPUT_BUFFER_PADDING_SIZE); \
164 memcpy(data, src, size); \
166 memset((uint8_t *)data + size, 0, \
167 FF_INPUT_BUFFER_PADDING_SIZE); \
171 int av_dup_packet(AVPacket *pkt)
175 if (!pkt->buf && pkt->data
176 #if FF_API_DESTRUCT_PACKET
183 pkt->side_data = NULL;
184 DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1, ALLOC_BUF);
185 #if FF_API_DESTRUCT_PACKET
186 pkt->destruct = dummy_destruct_packet;
189 if (pkt->side_data_elems) {
192 DUP_DATA(pkt->side_data, tmp_pkt.side_data,
193 pkt->side_data_elems * sizeof(*pkt->side_data), 0, ALLOC_MALLOC);
194 memset(pkt->side_data, 0,
195 pkt->side_data_elems * sizeof(*pkt->side_data));
196 for (i = 0; i < pkt->side_data_elems; i++)
197 DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
198 tmp_pkt.side_data[i].size, 1, ALLOC_MALLOC);
205 return AVERROR(ENOMEM);
208 void av_free_packet(AVPacket *pkt)
214 av_buffer_unref(&pkt->buf);
215 #if FF_API_DESTRUCT_PACKET
216 else if (pkt->destruct)
218 pkt->destruct = NULL;
223 for (i = 0; i < pkt->side_data_elems; i++)
224 av_free(pkt->side_data[i].data);
225 av_freep(&pkt->side_data);
226 pkt->side_data_elems = 0;
230 uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
233 int elems = pkt->side_data_elems;
235 if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
237 if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
240 pkt->side_data = av_realloc(pkt->side_data,
241 (elems + 1) * sizeof(*pkt->side_data));
245 pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
246 if (!pkt->side_data[elems].data)
248 pkt->side_data[elems].size = size;
249 pkt->side_data[elems].type = type;
250 pkt->side_data_elems++;
252 return pkt->side_data[elems].data;
255 uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
260 for (i = 0; i < pkt->side_data_elems; i++) {
261 if (pkt->side_data[i].type == type) {
263 *size = pkt->side_data[i].size;
264 return pkt->side_data[i].data;
270 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
275 for (i = 0; i < pkt->side_data_elems; i++) {
276 if (pkt->side_data[i].type == type) {
277 if (size > pkt->side_data[i].size)
278 return AVERROR(ENOMEM);
279 pkt->side_data[i].size = size;
283 return AVERROR(ENOENT);