[FFmpeg-cvslog] avformat/apetag: Avoid allocation for small tags

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Wed Nov 27 13:22:06 2019 +0100| [67ce9e0463e170179ece4abc33be716282a0202b] | committer: James Almer

avformat/apetag: Avoid allocation for small tags

By using avio_get_dyn_buf() + ffio_free_dyn_buf() instead of
avio_close_dyn_buf() + av_free() one can avoid an allocation + copy for
small tags. Furthermore, it simplifies freeing.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=67ce9e0463e170179ece4abc33be716282a0202b
---

 libavformat/apetag.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/libavformat/apetag.c b/libavformat/apetag.c
index 8cb3f4a23a..4e19f49bf1 100644
--- a/libavformat/apetag.c
+++ b/libavformat/apetag.c
@@ -186,11 +186,11 @@ int ff_ape_write_tag(AVFormatContext *s)
 {
     AVDictionaryEntry *e = NULL;
     int size, ret, count = 0;
-    AVIOContext *dyn_bc = NULL;
-    uint8_t *dyn_buf = NULL;
+    AVIOContext *dyn_bc;
+    uint8_t *dyn_buf;
 
     if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
-        goto end;
+        return ret;
 
     ff_standardize_creation_time(s);
     while ((e = av_dict_get(s->metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
@@ -211,7 +211,7 @@ int ff_ape_write_tag(AVFormatContext *s)
     if (!count)
         goto end;
 
-    size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
+    size = avio_get_dyn_buf(dyn_bc, &dyn_buf);
     if (size <= 0)
         goto end;
     size += APE_TAG_FOOTER_BYTES;
@@ -239,9 +239,7 @@ int ff_ape_write_tag(AVFormatContext *s)
     ffio_fill(s->pb, 0, 8);             // reserved
 
 end:
-    if (dyn_bc && !dyn_buf)
-        avio_close_dyn_buf(dyn_bc, &dyn_buf);
-    av_freep(&dyn_buf);
+    ffio_free_dyn_buf(&dyn_bc);
 
     return ret;
 }