From 4d55e9de27894ddfb337b28cd7aa6d14a12666d2 Mon Sep 17 00:00:00 2001
From: Diego Biurrun <diego@biurrun.de>
Date: Mon, 1 Sep 2014 13:57:24 -0700
Subject: [PATCH] vc1: Split bits used in libavformat into a separate header

This reduces inter-library dependencies.
---
 libavcodec/vc1.h        | 63 +---------------------------
 libavcodec/vc1_common.h | 92 +++++++++++++++++++++++++++++++++++++++++
 libavformat/movenc.c    |  2 +-
 3 files changed, 94 insertions(+), 63 deletions(-)
 create mode 100644 libavcodec/vc1_common.h

diff --git a/libavcodec/vc1.h b/libavcodec/vc1.h
index 9db8eddac2..780344a661 100644
--- a/libavcodec/vc1.h
+++ b/libavcodec/vc1.h
@@ -27,35 +27,11 @@
 #include "h264chroma.h"
 #include "mpegvideo.h"
 #include "intrax8.h"
+#include "vc1_common.h"
 #include "vc1dsp.h"
 
 #define AC_VLC_BITS 9
 
-/** Markers used in VC-1 AP frame data */
-//@{
-enum VC1Code {
-    VC1_CODE_RES0       = 0x00000100,
-    VC1_CODE_ENDOFSEQ   = 0x0000010A,
-    VC1_CODE_SLICE,
-    VC1_CODE_FIELD,
-    VC1_CODE_FRAME,
-    VC1_CODE_ENTRYPOINT,
-    VC1_CODE_SEQHDR,
-};
-//@}
-
-#define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
-
-/** Available Profiles */
-//@{
-enum Profile {
-    PROFILE_SIMPLE,
-    PROFILE_MAIN,
-    PROFILE_COMPLEX, ///< TODO: WMV9 specific
-    PROFILE_ADVANCED
-};
-//@}
-
 /** Sequence quantizer mode */
 //@{
 enum QuantMode {
@@ -404,43 +380,6 @@ typedef struct VC1Context{
     int resync_marker;           ///< could this stream contain resync markers
 } VC1Context;
 
-/** Find VC-1 marker in buffer
- * @return position where next marker starts or end of buffer if no marker found
- */
-static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
-{
-    uint32_t mrk = 0xFFFFFFFF;
-
-    if (end-src < 4)
-        return end;
-    while (src < end) {
-        mrk = (mrk << 8) | *src++;
-        if (IS_MARKER(mrk))
-            return src - 4;
-    }
-    return end;
-}
-
-static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
-{
-    int dsize = 0, i;
-
-    if (size < 4) {
-        for (dsize = 0; dsize < size; dsize++)
-            *dst++ = *src++;
-        return size;
-    }
-    for (i = 0; i < size; i++, src++) {
-        if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
-            dst[dsize++] = src[1];
-            src++;
-            i++;
-        } else
-            dst[dsize++] = *src;
-    }
-    return dsize;
-}
-
 /**
  * Decode Simple/Main Profiles sequence header
  * @see Figure 7-8, p16-17
diff --git a/libavcodec/vc1_common.h b/libavcodec/vc1_common.h
new file mode 100644
index 0000000000..788d324cd8
--- /dev/null
+++ b/libavcodec/vc1_common.h
@@ -0,0 +1,92 @@
+/*
+ * VC-1 and WMV3 decoder
+ * Copyright (c) 2006-2007 Konstantin Shishkov
+ * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_VC1_COMMON_H
+#define AVCODEC_VC1_COMMON_H
+
+#include <stdint.h>
+
+#include "libavutil/attributes.h"
+
+/** Markers used in VC-1 AP frame data */
+//@{
+enum VC1Code {
+    VC1_CODE_RES0       = 0x00000100,
+    VC1_CODE_ENDOFSEQ   = 0x0000010A,
+    VC1_CODE_SLICE,
+    VC1_CODE_FIELD,
+    VC1_CODE_FRAME,
+    VC1_CODE_ENTRYPOINT,
+    VC1_CODE_SEQHDR,
+};
+//@}
+
+#define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
+
+/** Available Profiles */
+//@{
+enum Profile {
+    PROFILE_SIMPLE,
+    PROFILE_MAIN,
+    PROFILE_COMPLEX, ///< TODO: WMV9 specific
+    PROFILE_ADVANCED
+};
+//@}
+
+/** Find VC-1 marker in buffer
+ * @return position where next marker starts or end of buffer if no marker found
+ */
+static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
+{
+    uint32_t mrk = 0xFFFFFFFF;
+
+    if (end-src < 4)
+        return end;
+    while (src < end) {
+        mrk = (mrk << 8) | *src++;
+        if (IS_MARKER(mrk))
+            return src - 4;
+    }
+    return end;
+}
+
+static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
+{
+    int dsize = 0, i;
+
+    if (size < 4) {
+        for (dsize = 0; dsize < size; dsize++)
+            *dst++ = *src++;
+        return size;
+    }
+    for (i = 0; i < size; i++, src++) {
+        if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
+            dst[dsize++] = src[1];
+            src++;
+            i++;
+        } else
+            dst[dsize++] = *src;
+    }
+    return dsize;
+}
+
+#endif /* AVCODEC_VC1_COMMON_H */
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 8af3c3419f..6c95b4b3aa 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -33,7 +33,7 @@
 #include "avc.h"
 #include "libavcodec/get_bits.h"
 #include "libavcodec/put_bits.h"
-#include "libavcodec/vc1.h"
+#include "libavcodec/vc1_common.h"
 #include "internal.h"
 #include "libavutil/avstring.h"
 #include "libavutil/intfloat.h"