gmf AVIO WritePacket issue

[liutong19890905]

AVIO WritePacket is blocked after calling av_interleaved_write_frame with ffmpeg 2.5.3, but if you use ffmpeg 2.4.3 , it`s OK.

[SeanThomasWilliams]

After a lengthy git bisect, the commit c8422f04a3256a9abc01588f1b4aa95f5aadc891 caused the spinlock on av_interleaved_write_frame:
Here is a link summary: https://patches.libav.org/patch/54249/
And the diff:

diff --git a/libavformat/avio.h b/libavformat/avio.h
index 2210c01..86f754e 100644
--- a/libavformat/avio.h
+++ b/libavformat/avio.h
@@ -289,10 +289,14 @@ int url_feof(AVIOContext *s);
 int avio_printf(AVIOContext *s, const char *fmt, ...) av_printf_format(2, 3);

 /**
- * Force flushing of buffered data to the output s.
+ * Force flushing of buffered data.
  *
- * Force the buffered data to be immediately written to the output,
+ * For write streams, force the buffered data to be immediately written to the output,
  * without to wait to fill the internal buffer.
+ *
+ * For read streams, discard all currently buffered data, and advance the
+ * reported file position to that of the underlying stream. This does not
+ * read new data, and does not perform any seeks.
  */
 void avio_flush(AVIOContext *s);

diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index 9795ba4..f01ed88 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -139,7 +139,7 @@ static void writeout(AVIOContext *s, const uint8_t *data, int len)

 static void flush_buffer(AVIOContext *s)
 {
-    if (s->buf_ptr > s->buffer) {
+    if (s->write_flag && s->buf_ptr > s->buffer) {
         writeout(s, s->buffer, s->buf_ptr - s->buffer);
         if (s->update_checksum) {
             s->checksum     = s->update_checksum(s->checksum, s->checksum_ptr,
@@ -148,6 +148,8 @@ static void flush_buffer(AVIOContext *s)
         }
     }
     s->buf_ptr = s->buffer;
+    if (!s->write_flag)
+        s->buf_end = s->buffer;
 }

 void avio_w8(AVIOContext *s, int b)