X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Faviobuf.c;h=ff850813e67c11ebffe4b76ad3d9a9ec665626fc;hb=a2517fca1e7dc5e0ff63c8490b5c92a9298f5837;hp=45400cd01da7ca4cb351dd0fb57d121e148755d8;hpb=01a6ae1396b5c96d23da40fe082d0f510fcab388;p=ffmpeg

diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index 45400cd01da..ff850813e67 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -97,6 +97,7 @@ int ffio_init_context(AVIOContext *s,
     s->seekable        = seek ? AVIO_SEEKABLE_NORMAL : 0;
     s->max_packet_size = 0;
     s->update_checksum = NULL;
+    s->short_seek_threshold = SHORT_SEEK_THRESHOLD;
 
     if (!read_packet && !write_flag) {
         s->pos     = buffer_size;
@@ -232,7 +233,7 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
         /* can do the seek inside the buffer */
         s->buf_ptr = s->buffer + offset1;
     } else if ((!s->seekable ||
-               offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) &&
+               offset1 <= s->buf_end + s->short_seek_threshold - s->buffer) &&
                !s->write_flag && offset1 >= 0 &&
                (!s->direct || !s->seek) &&
               (whence != SEEK_END || force)) {
@@ -812,6 +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;
 
@@ -829,6 +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;
 }