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avcodec/avpacket: add av_packet_make_writable()

Useful as well to quickly make a packet reference counted when it
isn't already so.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2018-03-19 12:39:08 -03:00
parent 28aaed7737
commit f14ca60001
4 changed files with 39 additions and 1 deletions

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@ -15,6 +15,9 @@ libavutil: 2017-10-21
API changes, most recent first:
2018-03-21 - xxxxxxx - lavc 58.15.100 - avcodec.h
Add av_packet_make_writable().
2018-03-18 - xxxxxxx - lavu 56.11.100 - frame.h
Add AV_FRAME_DATA_QP_TABLE_PROPERTIES and AV_FRAME_DATA_QP_TABLE_DATA.

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@ -4518,6 +4518,17 @@ void av_packet_move_ref(AVPacket *dst, AVPacket *src);
*/
int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
/**
* Create a writable reference for the data described by a given packet,
* avoiding data copy if possible.
*
* @param pkt Packet whose data should be made writable.
*
* @return 0 on success, a negative AVERROR on failure. On failure, the
* packet is unchanged.
*/
int av_packet_make_writable(AVPacket *pkt);
/**
* Convert valid timing fields (timestamps / durations) in a packet from one
* timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be

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@ -652,6 +652,30 @@ void av_packet_move_ref(AVPacket *dst, AVPacket *src)
src->size = 0;
}
int av_packet_make_writable(AVPacket *pkt)
{
AVBufferRef *buf = NULL;
int ret;
if (pkt->buf && av_buffer_is_writable(pkt->buf))
return 0;
if (!pkt->data)
return AVERROR(EINVAL);
ret = packet_alloc(&buf, pkt->size);
if (ret < 0)
return ret;
if (pkt->size)
memcpy(buf->data, pkt->data, pkt->size);
av_buffer_unref(&pkt->buf);
pkt->buf = buf;
pkt->data = buf->data;
return 0;
}
void av_packet_rescale_ts(AVPacket *pkt, AVRational src_tb, AVRational dst_tb)
{
if (pkt->pts != AV_NOPTS_VALUE)

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@ -28,7 +28,7 @@
#include "libavutil/version.h"
#define LIBAVCODEC_VERSION_MAJOR 58
#define LIBAVCODEC_VERSION_MINOR 14
#define LIBAVCODEC_VERSION_MINOR 15
#define LIBAVCODEC_VERSION_MICRO 100
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \