[FFmpeg-devel] [PATCH] avformat/tty: add probe function

[Paul B Mahol]

Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
 libavformat/tty.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/libavformat/tty.c b/libavformat/tty.c
index 8d48f2c45c..acc6da27cc 100644
--- a/libavformat/tty.c
+++ b/libavformat/tty.c
@@ -24,6 +24,8 @@
  * Tele-typewriter demuxer
  */
 
+#include <ctype.h>
+
 #include "libavutil/intreadwrite.h"
 #include "libavutil/avstring.h"
 #include "libavutil/log.h"
@@ -42,6 +44,16 @@ typedef struct TtyDemuxContext {
     AVRational framerate; /**< Set by a private option. */
 } TtyDemuxContext;
 
+static int read_probe(const AVProbeData *p)
+{
+    int64_t cnt = 0;
+
+    for (int i = 0; i < p->buf_size; i++)
+        cnt += !!isalnum(p->buf[i]);
+
+    return cnt * 100 / p->buf_size;
+}
+
 /**
  * Parse EFI header
  */
@@ -153,6 +165,7 @@ AVInputFormat ff_tty_demuxer = {
     .name           = "tty",
     .long_name      = NULL_IF_CONFIG_SMALL("Tele-typewriter"),
     .priv_data_size = sizeof(TtyDemuxContext),
+    .read_probe     = read_probe,
     .read_header    = read_header,
     .read_packet    = read_packet,
     .extensions     = "ans,art,asc,diz,ice,nfo,txt,vt",
-- 
2.17.1