move m4v demuxer to its own file

Originally committed as revision 24976 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 62 insertions, 0 deletions

diff --git a/libavformat/m4vdec.c b/libavformat/m4vdec.c
new file mode 100644
index 0000000000..21a2b5058b
--- /dev/null
+++ b/libavformat/m4vdec.c
@@ -0,0 +1,62 @@
+/*
+ * RAW MPEG-4 video demuxer
+ * Copyright (c) 2006  Thijs Vermeir <thijs.vermeir@barco.com>
+ *
+ * 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"
+
+#define VISUAL_OBJECT_START_CODE       0x000001b5
+#define VOP_START_CODE                 0x000001b6
+
+static int mpeg4video_probe(AVProbeData *probe_packet)
+{
+    uint32_t temp_buffer= -1;
+    int VO=0, VOL=0, VOP = 0, VISO = 0, res=0;
+    int i;
+
+    for(i=0; i<probe_packet->buf_size; i++){
+        temp_buffer = (temp_buffer<<8) + probe_packet->buf[i];
+        if ((temp_buffer & 0xffffff00) != 0x100)
+            continue;
+
+        if (temp_buffer == VOP_START_CODE)                         VOP++;
+        else if (temp_buffer == VISUAL_OBJECT_START_CODE)          VISO++;
+        else if (temp_buffer < 0x120)                              VO++;
+        else if (temp_buffer < 0x130)                              VOL++;
+        else if (   !(0x1AF < temp_buffer && temp_buffer < 0x1B7)
+                 && !(0x1B9 < temp_buffer && temp_buffer < 0x1C4)) res++;
+    }
+
+    if ( VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res==0)
+        return AVPROBE_SCORE_MAX/2;
+    return 0;
+}
+
+AVInputFormat m4v_demuxer = {
+    "m4v",
+    NULL_IF_CONFIG_SMALL("raw MPEG-4 video format"),
+    0,
+    mpeg4video_probe, /** probing for MPEG-4 data */
+    ff_raw_video_read_header,
+    ff_raw_read_partial_packet,
+    .flags= AVFMT_GENERIC_INDEX,
+    .extensions = "m4v",
+    .value = CODEC_ID_MPEG4,
+};