X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Faviobuf.c;h=ff850813e67c11ebffe4b76ad3d9a9ec665626fc;hb=a4d76faf45cf1ec7d39d62b4707260e211a932c7;hp=dfefe62ecdc7d322b51eddc6a9aef129032b79f5;hpb=63b0356274bc496c486cbedcb563302c36996024;p=ffmpeg

diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index dfefe62ecdc..ff850813e67 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -813,6 +813,7 @@ int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
     int max_buffer_size = s->max_packet_size ?
                           s->max_packet_size : IO_BUFFER_SIZE;
     int filled = s->buf_end - s->buffer;
+    ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
 
     buf_size += s->buf_ptr - s->buffer + max_buffer_size;
 
@@ -830,6 +831,8 @@ int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
     s->buf_end = buffer + (s->buf_end - s->buffer);
     s->buffer = buffer;
     s->buffer_size = buf_size;
+    if (checksum_ptr_offset >= 0)
+        s->checksum_ptr = s->buffer + checksum_ptr_offset;
     return 0;
 }