Merge commit '81eec081afea9fc017a175581ceea7c420a0dfc3'
[ffmpeg.git] / libavformat / mpegvideodec.c
index 4700727..ade76d8 100644 (file)
@@ -21,7 +21,9 @@
  */
 
 #include "avformat.h"
-#include "raw.h"
+#include "rawdec.h"
+
+#include "libavutil/intreadwrite.h"
 
 #define SEQ_START_CODE          0x000001b3
 #define GOP_START_CODE          0x000001b8
 static int mpegvideo_probe(AVProbeData *p)
 {
     uint32_t code= -1;
-    int pic=0, seq=0, slice=0, pspack=0, pes=0;
-    int i;
+    int pic=0, seq=0, slice=0, pspack=0, vpes=0, apes=0, res=0, sicle=0;
+    int i, j;
+    uint32_t last = 0;
 
     for(i=0; i<p->buf_size; i++){
         code = (code<<8) + p->buf[i];
         if ((code & 0xffffff00) == 0x100) {
             switch(code){
-            case     SEQ_START_CODE:   seq++; break;
+            case     SEQ_START_CODE:
+                if (!(p->buf[i+1+3+1+2] & 0x20))
+                    break;
+                j = i;
+                if (p->buf[j+8] & 2)
+                    j+= 64;
+                if (j >= p->buf_size)
+                    break;
+                if (p->buf[j+8] & 1)
+                    j+= 64;
+                if (j >= p->buf_size)
+                    break;
+                if (AV_RB24(p->buf + j + 9) & 0xFFFFFE)
+                    break;
+                seq++;
+            break;
             case PICTURE_START_CODE:   pic++; break;
-            case   SLICE_START_CODE: slice++; break;
             case    PACK_START_CODE: pspack++; break;
+            case              0x1b6:
+                                        res++; break;
+            }
+            if (code >= SLICE_START_CODE && code <= 0x1af) {
+                if (last >= SLICE_START_CODE && last <= 0x1af) {
+                    if (code >= last) slice++;
+                    else              sicle++;
+                }else{
+                    if (code == SLICE_START_CODE) slice++;
+                    else                          sicle++;
+                }
             }
-            if     ((code & 0x1f0) == VIDEO_ID)   pes++;
-            else if((code & 0x1e0) == AUDIO_ID)   pes++;
+            if     ((code & 0x1f0) == VIDEO_ID)   vpes++;
+            else if((code & 0x1e0) == AUDIO_ID)   apes++;
+            last = code;
         }
     }
-    if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !pes)
-        return pic>1 ? AVPROBE_SCORE_MAX/2+1 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
+    if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !apes && !res && slice > sicle) {
+        if(vpes) return AVPROBE_SCORE_EXTENSION / 4;
+        else     return pic>1 ? AVPROBE_SCORE_EXTENSION + 1 : AVPROBE_SCORE_EXTENSION / 2; // +1 for .mpg
+    }
     return 0;
 }
 
-AVInputFormat mpegvideo_demuxer = {
-    "mpegvideo",
-    NULL_IF_CONFIG_SMALL("raw MPEG video"),
-    0,
-    mpegvideo_probe,
-    ff_raw_video_read_header,
-    ff_raw_read_partial_packet,
-    .flags= AVFMT_GENERIC_INDEX,
-    .value = CODEC_ID_MPEG1VIDEO,
-};
+FF_DEF_RAWVIDEO_DEMUXER(mpegvideo, "raw MPEG video", mpegvideo_probe, NULL, AV_CODEC_ID_MPEG1VIDEO)