Useful as well to quickly make a packet reference counted when it
isn't already so.
Signed-off-by: James Almer <jamr...@gmail.com>
---
libavcodec/avcodec.h | 11 +++++++++++
libavcodec/avpacket.c | 24 ++++++++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index a8322fb62a..a78017f1fb 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -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
diff --git a/libavcodec/avpacket.c b/libavcodec/avpacket.c
index fe8113ab76..0693ca6f62 100644
--- a/libavcodec/avpacket.c
+++ b/libavcodec/avpacket.c
@@ -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)
--
2.16.2
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