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avformat/tty: add probe function 

(cherry picked from commit 3bce9e9b3e)
This commit is contained in:
Paul B Mahol 2020-01-27 21:53:08 +01:00 committed by Michael Niedermayer
parent 98981312e1
commit f126288f23
1 changed files with 20 additions and 1 deletions
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21
libavformat/tty.c
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@ -34,6 +34,13 @@
#include "internal.h"
#include "sauce.h"
static int isansicode(int x)
{
return x == 0x1B || x == 0x0A || x == 0x0D || (x >= 0x20 && x < 0x7f);
}
static const char tty_extensions[31] = "ans,art,asc,diz,ice,nfo,txt,vt";
typedef struct TtyDemuxContext {
AVClass *class;
int chars_per_frame;
@ -42,6 +49,17 @@ typedef struct TtyDemuxContext {
AVRational framerate; /**< Set by a private option. */
} TtyDemuxContext;
static int read_probe(const AVProbeData *p)
{
int cnt = 0;
for (int i = 0; i < p->buf_size; i++)
cnt += !!isansicode(p->buf[i]);
return (cnt * 100LL / p->buf_size) * (cnt > 400) *
!!av_match_ext(p->filename, tty_extensions);
}
/**
* Parse EFI header
*/
@ -153,8 +171,9 @@ 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",
.extensions = tty_extensions,
.priv_class = &tty_demuxer_class,
};