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FFmpeg/libavcodec/avpacket.c
Martin Storsjö 8965e2af92 avpacket: Initialize the allocated padding area in side data 
This makes sure that consumers of the side data actually can
rely on the padding as intended, without having the callers of
av_packet_new_side_data to explicitly zero initialize it.

Signed-off-by: Martin Storsjö <martin@martin.st>
2018-02-01 15:50:00 +02:00

425 lines
12 KiB
C
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/*
* AVPacket functions for libavcodec
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include "libavutil/avassert.h"
#include "libavutil/common.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "libavutil/mem.h"
#include "avcodec.h"
void av_init_packet(AVPacket *pkt)
{
pkt->pts = AV_NOPTS_VALUE;
pkt->dts = AV_NOPTS_VALUE;
pkt->pos = -1;
pkt->duration = 0;
#if FF_API_CONVERGENCE_DURATION
FF_DISABLE_DEPRECATION_WARNINGS
pkt->convergence_duration = 0;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
pkt->flags = 0;
pkt->stream_index = 0;
pkt->buf = NULL;
pkt->side_data = NULL;
pkt->side_data_elems = 0;
}
AVPacket *av_packet_alloc(void)
{
AVPacket *pkt = av_mallocz(sizeof(AVPacket));
if (!pkt)
return pkt;
av_packet_unref(pkt);
return pkt;
}
void av_packet_free(AVPacket **pkt)
{
if (!pkt || !*pkt)
return;
av_packet_unref(*pkt);
av_freep(pkt);
}
static int packet_alloc(AVBufferRef **buf, int size)
{
int ret;
if (size < 0 || size >= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
return AVERROR(EINVAL);
ret = av_buffer_realloc(buf, size + AV_INPUT_BUFFER_PADDING_SIZE);
if (ret < 0)
return ret;
memset((*buf)->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
return 0;
}
int av_new_packet(AVPacket *pkt, int size)
{
AVBufferRef *buf = NULL;
int ret = packet_alloc(&buf, size);
if (ret < 0)
return ret;
av_init_packet(pkt);
pkt->buf = buf;
pkt->data = buf->data;
pkt->size = size;
return 0;
}
void av_shrink_packet(AVPacket *pkt, int size)
{
if (pkt->size <= size)
return;
pkt->size = size;
memset(pkt->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
}
int av_grow_packet(AVPacket *pkt, int grow_by)
{
int new_size;
av_assert0((unsigned)pkt->size <= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE);
if (!pkt->size)
return av_new_packet(pkt, grow_by);
if ((unsigned)grow_by >
INT_MAX - (pkt->size + AV_INPUT_BUFFER_PADDING_SIZE))
return -1;
new_size = pkt->size + grow_by + AV_INPUT_BUFFER_PADDING_SIZE;
if (pkt->buf) {
int ret = av_buffer_realloc(&pkt->buf, new_size);
if (ret < 0)
return ret;
} else {
pkt->buf = av_buffer_alloc(new_size);
if (!pkt->buf)
return AVERROR(ENOMEM);
memcpy(pkt->buf->data, pkt->data, FFMIN(pkt->size, pkt->size + grow_by));
}
pkt->data = pkt->buf->data;
pkt->size += grow_by;
memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
return 0;
}
int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
{
if (size >= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
return AVERROR(EINVAL);
pkt->buf = av_buffer_create(data, size + AV_INPUT_BUFFER_PADDING_SIZE,
av_buffer_default_free, NULL, 0);
if (!pkt->buf)
return AVERROR(ENOMEM);
pkt->data = data;
pkt->size = size;
return 0;
}
#if FF_API_AVPACKET_OLD_API
FF_DISABLE_DEPRECATION_WARNINGS
#define ALLOC_MALLOC(data, size) data = av_malloc(size)
#define ALLOC_BUF(data, size) \
do { \
av_buffer_realloc(&pkt->buf, size); \
data = pkt->buf ? pkt->buf->data : NULL; \
} while (0)
#define DUP_DATA(dst, src, size, padding, ALLOC) \
do { \
void *data; \
if (padding) { \
if ((unsigned)(size) > \
(unsigned)(size) + AV_INPUT_BUFFER_PADDING_SIZE) \
goto failed_alloc; \
ALLOC(data, size + AV_INPUT_BUFFER_PADDING_SIZE); \
} else { \
ALLOC(data, size); \
} \
if (!data) \
goto failed_alloc; \
memcpy(data, src, size); \
if (padding) \
memset((uint8_t *)data + size, 0, \
AV_INPUT_BUFFER_PADDING_SIZE); \
dst = data; \
} while (0)
int av_dup_packet(AVPacket *pkt)
{
AVPacket tmp_pkt;
if (!pkt->buf && pkt->data) {
tmp_pkt = *pkt;
pkt->data = NULL;
pkt->side_data = NULL;
DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1, ALLOC_BUF);
if (pkt->side_data_elems) {
int i;
DUP_DATA(pkt->side_data, tmp_pkt.side_data,
pkt->side_data_elems * sizeof(*pkt->side_data), 0, ALLOC_MALLOC);
memset(pkt->side_data, 0,
pkt->side_data_elems * sizeof(*pkt->side_data));
for (i = 0; i < pkt->side_data_elems; i++) {
DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
tmp_pkt.side_data[i].size, 1, ALLOC_MALLOC);
pkt->side_data[i].size = tmp_pkt.side_data[i].size;
pkt->side_data[i].type = tmp_pkt.side_data[i].type;
}
}
}
return 0;
failed_alloc:
av_packet_unref(pkt);
return AVERROR(ENOMEM);
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
void av_packet_free_side_data(AVPacket *pkt)
{
int i;
for (i = 0; i < pkt->side_data_elems; i++)
av_free(pkt->side_data[i].data);
av_freep(&pkt->side_data);
pkt->side_data_elems = 0;
}
#if FF_API_AVPACKET_OLD_API
FF_DISABLE_DEPRECATION_WARNINGS
void av_free_packet(AVPacket *pkt)
{
if (pkt) {
if (pkt->buf)
av_buffer_unref(&pkt->buf);
pkt->data = NULL;
pkt->size = 0;
av_packet_free_side_data(pkt);
}
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
uint8_t *data, size_t size)
{
AVPacketSideData *tmp;
int elems = pkt->side_data_elems;
if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
return AVERROR(ERANGE);
tmp = av_realloc(pkt->side_data, (elems + 1) * sizeof(*tmp));
if (!tmp)
return AVERROR(ENOMEM);
pkt->side_data = tmp;
pkt->side_data[elems].data = data;
pkt->side_data[elems].size = size;
pkt->side_data[elems].type = type;
pkt->side_data_elems++;
return 0;
}
uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
int size)
{
int ret;
uint8_t *data;
if (!size || (unsigned)size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
return NULL;
data = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!data)
return NULL;
memset(data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
ret = av_packet_add_side_data(pkt, type, data, size);
if (ret < 0) {
av_freep(&data);
return NULL;
}
return data;
}
uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
int *size)
{
int i;
for (i = 0; i < pkt->side_data_elems; i++) {
if (pkt->side_data[i].type == type) {
if (size)
*size = pkt->side_data[i].size;
return pkt->side_data[i].data;
}
}
return NULL;
}
int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
int size)
{
int i;
for (i = 0; i < pkt->side_data_elems; i++) {
if (pkt->side_data[i].type == type) {
if (size > pkt->side_data[i].size)
return AVERROR(ENOMEM);
pkt->side_data[i].size = size;
return 0;
}
}
return AVERROR(ENOENT);
}
int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
{
int i;
dst->pts = src->pts;
dst->dts = src->dts;
dst->pos = src->pos;
dst->duration = src->duration;
#if FF_API_CONVERGENCE_DURATION
FF_DISABLE_DEPRECATION_WARNINGS
dst->convergence_duration = src->convergence_duration;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
dst->flags = src->flags;
dst->stream_index = src->stream_index;
for (i = 0; i < src->side_data_elems; i++) {
enum AVPacketSideDataType type = src->side_data[i].type;
int size = src->side_data[i].size;
uint8_t *src_data = src->side_data[i].data;
uint8_t *dst_data = av_packet_new_side_data(dst, type, size);
if (!dst_data) {
av_packet_free_side_data(dst);
return AVERROR(ENOMEM);
}
memcpy(dst_data, src_data, size);
}
return 0;
}
void av_packet_unref(AVPacket *pkt)
{
av_packet_free_side_data(pkt);
av_buffer_unref(&pkt->buf);
av_init_packet(pkt);
pkt->data = NULL;
pkt->size = 0;
}
int av_packet_ref(AVPacket *dst, const AVPacket *src)
{
int ret;
ret = av_packet_copy_props(dst, src);
if (ret < 0)
return ret;
if (!src->buf) {
ret = packet_alloc(&dst->buf, src->size);
if (ret < 0)
goto fail;
memcpy(dst->buf->data, src->data, src->size);
dst->data = dst->buf->data;
} else {
dst->buf = av_buffer_ref(src->buf);
if (!dst->buf) {
ret = AVERROR(ENOMEM);
goto fail;
}
dst->data = src->data;
}
dst->size = src->size;
return 0;
fail:
av_packet_free_side_data(dst);
return ret;
}
AVPacket *av_packet_clone(const AVPacket *src)
{
AVPacket *ret = av_packet_alloc();
if (!ret)
return ret;
if (av_packet_ref(ret, src))
av_packet_free(&ret);
return ret;
}
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
{
*dst = *src;
av_init_packet(src);
src->data = NULL;
src->size = 0;
}
void av_packet_rescale_ts(AVPacket *pkt, AVRational src_tb, AVRational dst_tb)
{
if (pkt->pts != AV_NOPTS_VALUE)
pkt->pts = av_rescale_q(pkt->pts, src_tb, dst_tb);
if (pkt->dts != AV_NOPTS_VALUE)
pkt->dts = av_rescale_q(pkt->dts, src_tb, dst_tb);
if (pkt->duration > 0)
pkt->duration = av_rescale_q(pkt->duration, src_tb, dst_tb);
#if FF_API_CONVERGENCE_DURATION
FF_DISABLE_DEPRECATION_WARNINGS
if (pkt->convergence_duration > 0)
pkt->convergence_duration = av_rescale_q(pkt->convergence_duration, src_tb, dst_tb);
FF_ENABLE_DEPRECATION_WARNINGS
#endif
}
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