ffmpeg source update for sep 09

source/patched-ffmpeg-mt/libavformat/mpegvideodec.c

+/*
+ * 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, pes=0;
+    int i;
+
+    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   SLICE_START_CODE: slice++; break;
+            case    PACK_START_CODE: pspack++; break;
+            }
+            if     ((code & 0x1f0) == VIDEO_ID)   pes++;
+            else if((code & 0x1e0) == AUDIO_ID)   pes++;
+        }
+    }
+    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
+    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,
+};