[FFmpeg-cvslog] lavf/utils: fix error like "offset 0x1f85: partial file"

[tomajsjiang]

ffmpeg | branch: master | tomajsjiang <tomajsjiang at tencent.com> | Wed Aug  7 22:48:28 2019 +0800| [9c3adb7ce23522dcceb264bc0bffd3592dd3e1a5] | committer: Jun Zhao

lavf/utils: fix error like "offset 0x1f85: partial file"

fix error like "offset 0x1f85: partial file", the root cause is when
read the mp4 file from http, and the moov in the end of the mp4 file,
reconfig the buffer will drop some data.

Signed-off-by: Jun Zhao <barryjzhao at tencent.com>
Signed-off-by: Zhongxing Jiang <tomajsjiang at tencent.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9c3adb7ce23522dcceb264bc0bffd3592dd3e1a5
---

 libavformat/utils.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libavformat/utils.c b/libavformat/utils.c
index 6c6f4e1bd1..b57e680089 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2136,7 +2136,13 @@ void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance)
     /* XXX This could be adjusted depending on protocol*/
     if (s->pb->buffer_size < pos_delta && pos_delta < (1<<24)) {
         av_log(s, AV_LOG_VERBOSE, "Reconfiguring buffers to size %"PRId64"\n", pos_delta);
-        ffio_set_buf_size(s->pb, pos_delta);
+
+        /* realloc the buffer and the original data will be retained */
+        if (ffio_realloc_buf(s->pb, pos_delta)) {
+            av_log(s, AV_LOG_ERROR, "Realloc buffer fail.\n");
+            return;
+        }
+
         s->pb->short_seek_threshold = FFMAX(s->pb->short_seek_threshold, pos_delta/2);
     }