diff options
author | Paul B Mahol <onemda@gmail.com> | 2020-01-27 21:53:08 +0100 |
---|---|---|
committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-10-31 18:45:40 +0100 |
commit | e5d1808aa54f344a0189ec9428b648906ba5e123 (patch) | |
tree | 5c7fa5567696930a2d33870a62109e9b947f04e7 /libavformat | |
parent | 450b51b409bd1327e9d60b0396e56cad31835890 (diff) | |
download | ffmpeg-e5d1808aa54f344a0189ec9428b648906ba5e123.tar.gz |
avformat/tty: add probe function
(cherry picked from commit 3bce9e9b3ea35c54bacccc793d7da99ea5157532)
Diffstat (limited to 'libavformat')
-rw-r--r-- | libavformat/tty.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/libavformat/tty.c b/libavformat/tty.c index 9022e915fa..0a2f110f30 100644 --- a/libavformat/tty.c +++ b/libavformat/tty.c @@ -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, }; |