move h263 demuxer to its own file

Originally committed as revision 24979 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 77 insertions, 0 deletions

diff --git a/libavformat/h263dec.c b/libavformat/h263dec.c
new file mode 100644
index 0000000000..4aec94eb25
--- /dev/null
+++ b/libavformat/h263dec.c
@@ -0,0 +1,77 @@
+/*
+ * RAW H.263 video demuxer
+ * Copyright (c) 2009 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 "raw.h"
+
+static int h263_probe(AVProbeData *p)
+{
+    uint64_t code= -1;
+    int i;
+    int valid_psc=0;
+    int invalid_psc=0;
+    int res_change=0;
+    int src_fmt, last_src_fmt=-1;
+    int last_gn=0;
+
+    for(i=0; i<p->buf_size; i++){
+        code = (code<<8) + p->buf[i];
+        if ((code & 0xfffffc0000) == 0x800000) {
+            src_fmt= (code>>2)&3;
+            if(   src_fmt != last_src_fmt
+               && last_src_fmt>0 && last_src_fmt<6
+               && src_fmt<6)
+                res_change++;
+
+            if((code&0x300)==0x200 && src_fmt){
+                valid_psc++;
+                last_gn=0;
+            }else
+                invalid_psc++;
+            last_src_fmt= src_fmt;
+        } else if((code & 0xffff800000) == 0x800000) {
+            int gn= (code>>(23-5)) & 0x1F;
+            if(gn<last_gn){
+                invalid_psc++;
+            }else
+                last_gn= gn;
+        }
+    }
+//av_log(NULL, AV_LOG_ERROR, "h263_probe: psc:%d invalid:%d res_change:%d\n", valid_psc, invalid_psc, res_change);
+//h263_probe: psc:3 invalid:0 res_change:0 (1588/recent_ffmpeg_parses_mpg_incorrectly.mpg)
+    if(valid_psc > 2*invalid_psc + 2*res_change + 3){
+        return 50;
+    }else if(valid_psc > 2*invalid_psc)
+        return 25;
+    return 0;
+}
+
+AVInputFormat h263_demuxer = {
+    "h263",
+    NULL_IF_CONFIG_SMALL("raw H.263"),
+    0,
+    h263_probe,
+    ff_raw_video_read_header,
+    ff_raw_read_partial_packet,
+    .flags= AVFMT_GENERIC_INDEX,
+//    .extensions = "h263", //FIXME remove after writing mpeg4_probe
+    .value = CODEC_ID_H263,
+};