add support for information in CDXA format

patch by Allan Sandfeld Jensen % kde A carewolf P com %
Original thread:
Date: Aug 18, 2006 6:33 PM
Subject: [Ffmpeg-devel] CDXA in libavformat [patch]

Originally committed as revision 6124 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mpeg.c

@@ -1260,6 +1260,20 @@ static int mpeg_mux_end(AVFormatContext *ctx)
 
 #define MAX_SYNC_SIZE 100000
 
+static int cdxa_probe(AVProbeData *p)
+{
+    /* check file header */
+    if (p->buf_size <= 32)
+        return 0;
+    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
+        p->buf[2] == 'F' && p->buf[3] == 'F' &&
+        p->buf[8] == 'C' && p->buf[9] == 'D' &&
+        p->buf[10] == 'X' && p->buf[11] == 'A')
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
 static int mpegps_probe(AVProbeData *p)
 {
     uint32_t code= -1;
@@ -1267,6 +1281,10 @@ static int mpegps_probe(AVProbeData *p)
     int i;
     int score=0;
 
+    score = cdxa_probe(p);
+    if (score > 0) return score;
+
+    /* Search for MPEG stream */
     for(i=0; i<p->buf_size; i++){
         code = (code<<8) + p->buf[i];
         if ((code & 0xffffff00) == 0x100) {