making act segmenter

1 files changed, 72 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/mpegvideodec.c b/ffmpeg/libavformat/mpegvideodec.c
new file mode 100644
index 0000000..471d2f4
--- /dev/null
+++ b/ffmpeg/libavformat/mpegvideodec.c
@@ -0,0 +1,72 @@
+/*
+ * RAW MPEG video demuxer
+ * Copyright (c) 2002-2003 Fabrice Bellard
+ * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avformat.h"
+#include "rawdec.h"
+
+#define SEQ_START_CODE          0x000001b3
+#define GOP_START_CODE          0x000001b8
+#define PICTURE_START_CODE      0x00000100
+#define SLICE_START_CODE        0x00000101
+#define PACK_START_CODE         0x000001ba
+#define VIDEO_ID                0x000001e0
+#define AUDIO_ID                0x000001c0
+
+static int mpegvideo_probe(AVProbeData *p)
+{
+    uint32_t code= -1;
+    int pic=0, seq=0, slice=0, pspack=0, vpes=0, apes=0, res=0, sicle=0;
+    int i;
+    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 PICTURE_START_CODE:   pic++; 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)   vpes++;
+            else if((code & 0x1e0) == AUDIO_ID)   apes++;
+            last = code;
+        }
+    }
+    if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !apes && !res && slice > sicle) {
+        if(vpes) return AVPROBE_SCORE_MAX/8;
+        else     return pic>1 ? AVPROBE_SCORE_MAX/2+1 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
+    }
+    return 0;
+}
+
+FF_DEF_RAWVIDEO_DEMUXER(mpegvideo, "raw MPEG video", mpegvideo_probe, NULL, AV_CODEC_ID_MPEG1VIDEO)