lavf/vc1dec: Autodetect raw vc-1 streams.

Move the demuxer into its own file.

1 files changed, 81 insertions, 0 deletions

diff --git a/libavformat/vc1dec.c b/libavformat/vc1dec.c
new file mode 100644
index 0000000000..33f84652eb
--- /dev/null
+++ b/libavformat/vc1dec.c
@@ -0,0 +1,81 @@
+/*
+ * VC-1 demuxer
+ * Copyright (c) 2015 Carl Eugen Hoyos
+ *
+ * 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"
+#include "libavutil/intreadwrite.h"
+#include "libavcodec/vc1_common.h"
+
+static int vc1_probe(AVProbeData *p)
+{
+    int seq = 0, entry = 0, frame = 0, i;
+
+    for (i = 0; i < p->buf_size + 5; i++) {
+        uint32_t code = AV_RB32(p->buf + i);
+        if ((code & 0xffffffe0) == 0x100) {
+            int type = code & 0x11f;
+            i += 4;
+            switch (type) {
+            case VC1_CODE_SEQHDR: {
+                int profile, level, chromaformat;
+                profile = (p->buf[i] & 0xc0) >> 6;
+                if (profile != PROFILE_ADVANCED) {
+                    seq = 0;
+                    continue;
+                }
+                level = (p->buf[i] & 0x38) >> 3;
+                if (level >= 5) {
+                    seq = 0;
+                    continue;
+                }
+                chromaformat = (p->buf[i] & 0x6) >> 1;
+                if (chromaformat != 1) {
+                    seq = 0;
+                    continue;
+                }
+                seq++;
+                i += 6;
+                break;
+            }
+            case VC1_CODE_ENTRYPOINT:
+                if (!seq)
+                    continue;
+                entry++;
+                i += 2;
+                break;
+            case VC1_CODE_FRAME:
+            case VC1_CODE_FIELD:
+            case VC1_CODE_SLICE:
+                if (seq && entry)
+                    frame++;
+                break;
+            }
+        }
+    }
+
+    if (frame > 1)
+        return AVPROBE_SCORE_EXTENSION / 2 + 1;
+    if (frame == 1)
+        return AVPROBE_SCORE_EXTENSION / 4;
+    return 0;
+}
+
+FF_DEF_RAWVIDEO_DEMUXER2(vc1, "raw VC-1", vc1_probe, "vc1", AV_CODEC_ID_VC1, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)