avformat: Constify all muxer/demuxers

[ffmpeg] / libavformat / tty.c

diff --git a/libavformat/tty.c b/libavformat/tty.c
index 8d48f2c45c12d3a58f6c754300e039ab42ac5ea8..fbea3196fadc076c18fd8fbf67d5b6e282e73761 100644 (file)
--- 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 +49,26 @@ typedef struct TtyDemuxContext {
     AVRational framerate; /**< Set by a private option. */
 } TtyDemuxContext;
 
+static int read_probe(const AVProbeData *p)
+{
+    int cnt = 0;
+
+    if (!p->buf_size)
+        return 0;
+
+    for (int i = 0; i < 8 && i < p->buf_size; i++)
+        cnt += !!isansicode(p->buf[i]);
+
+    if (cnt != 8)
+        return 0;
+
+    for (int i = 8; i < p->buf_size; i++)
+        cnt += !!isansicode(p->buf[i]);
+
+    return (cnt * 99LL / p->buf_size) * (cnt > 400) *
+        !!av_match_ext(p->filename, tty_extensions);
+}
+
 /**
  * Parse EFI header
  */
@@ -129,6 +156,8 @@ static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
     pkt->size = av_get_packet(avctx->pb, pkt, n);
     if (pkt->size < 0)
         return pkt->size;
+    pkt->stream_index = 0;
+    pkt->pts = pkt->pos / s->chars_per_frame;
     pkt->flags |= AV_PKT_FLAG_KEY;
     return 0;
 }
@@ -149,12 +178,14 @@ static const AVClass tty_demuxer_class = {
     .version        = LIBAVUTIL_VERSION_INT,
 };
 
-AVInputFormat ff_tty_demuxer = {
+const 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,
+    .flags          = AVFMT_GENERIC_INDEX,
 };