ffmpeg source update for sep 09

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

+/*
+ * RAW Chinese AVS video demuxer
+ * Copyright (c) 2009  Stefan Gehrer <stefan.gehrer@gmx.de>
+ *
+ * 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 CAVS_SEQ_START_CODE       0x000001b0
+#define CAVS_PIC_I_START_CODE     0x000001b3
+#define CAVS_UNDEF_START_CODE     0x000001b4
+#define CAVS_PIC_PB_START_CODE    0x000001b6
+#define CAVS_VIDEO_EDIT_CODE      0x000001b7
+#define CAVS_PROFILE_JIZHUN       0x20
+
+static int cavsvideo_probe(AVProbeData *p)
+{
+    uint32_t code= -1;
+    int pic=0, seq=0, slice_pos = 0;
+    int i;
+
+    for(i=0; i<p->buf_size; i++){
+        code = (code<<8) + p->buf[i];
+        if ((code & 0xffffff00) == 0x100) {
+            if(code < CAVS_SEQ_START_CODE) {
+                /* slices have to be consecutive */
+                if(code < slice_pos)
+                    return 0;
+                slice_pos = code;
+            } else {
+                slice_pos = 0;
+            }
+            if (code == CAVS_SEQ_START_CODE) {
+                seq++;
+                /* check for the only currently supported profile */
+                if(p->buf[i+1] != CAVS_PROFILE_JIZHUN)
+                    return 0;
+            } else if ((code == CAVS_PIC_I_START_CODE) ||
+                       (code == CAVS_PIC_PB_START_CODE)) {
+                pic++;
+            } else if ((code == CAVS_UNDEF_START_CODE) ||
+                       (code >  CAVS_VIDEO_EDIT_CODE)) {
+                return 0;
+            }
+        }
+    }
+    if(seq && seq*9<=pic*10)
+        return AVPROBE_SCORE_MAX/2;
+    return 0;
+}
+
+AVInputFormat cavsvideo_demuxer = {
+    "cavsvideo",
+    NULL_IF_CONFIG_SMALL("raw Chinese AVS video"),
+    0,
+    cavsvideo_probe,
+    ff_raw_video_read_header,
+    ff_raw_read_partial_packet,
+    .flags= AVFMT_GENERIC_INDEX,
+    .value = CODEC_ID_CAVS,
+};