On 1/27/2020 7:16 PM, Paul B Mahol wrote:
> Signed-off-by: Paul B Mahol <one...@gmail.com>
> ---
> libavformat/tty.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/libavformat/tty.c b/libavformat/tty.c
> index 8d48f2c45c..75af16a6f1 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 +44,17 @@ 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 += !!isprint(p->buf[i]);
cnt here will never be > p->buf_size, so just make it an int and cast it
to int64_t in the line below. Otherwise the above loop will be slower
than necessary on 32 bit arches.
> +
> + return (cnt * 100 / p->buf_size) * (cnt > 500) *
> + !!av_match_ext(p->filename, "ans,art,asc,diz,ice,nfo,txt,vt");
> +}
> +
> /**
> * Parse EFI header
> */
> @@ -153,6 +166,7 @@ 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",
>
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