avio: Collect and print statistics of bytes read & seeks

Signed-off-by: Michael Niedermayer <[email protected]>

libavformat/avio.h

@@ -128,6 +128,18 @@ typedef struct {
  * call the underlying seek function directly.
  */
  int direct;
+
+ /**
+ * Bytes read statistic
+ * This field is internal to libavformat and access from outside is not allowed.
+ */
+ int64_t bytes_read;
+
+ /**
+ * seek statistic
+ * This field is internal to libavformat and access from outside is not allowed.
+ */
+ int seek_count;
 } AVIOContext;
 
 /* unbuffered I/O */

libavformat/aviobuf.c

@@ -237,6 +237,7 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
  return AVERROR(EPIPE);
  if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
  return res;
+ s->seek_count ++;
  if (!s->write_flag)
  s->buf_end = s->buffer;
  s->buf_ptr = s->buffer;
@@ -423,6 +424,7 @@ static void fill_buffer(AVIOContext *s)
  s->pos += len;
  s->buf_ptr = dst;
  s->buf_end = dst + len;
+ s->bytes_read += len;
  }
 }
 
@@ -792,6 +794,8 @@ int avio_close(AVIOContext *s)
 
  h = s->opaque;
  av_free(s->buffer);
+ if (!s->write_flag)
+ av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
  av_free(s);
  return ffurl_close(h);
 }