Add copies of needed internal FFmpeg files under ffmpeg_files/

MPlayer used to depend on having an FFmpeg tree available at build
time to provide this code, and FFmpeg changes occasionally broke
the MPlayer build as a result. Some of the relevant functionality also
depends on FFmpeg library symbols that are not part of the FFmpeg API,
meaning that library changes could break MPlayer after the build. Add
a copy of the relevant functionality to the MPlayer tree and use that
instead.

The added files are:
- The headers bswap.h, intreadwrite.h and x86_cpu.h from libavutil.
  Some MPlayer code uses the functionality defined as macros and
  static inline functions in these headers.
- Architecture-specific internal files used by the above headers.
  These are in the subdirectories: x86/, arm/, bfin/, sh4/.
- taglists.[ch], which provides the codec tables from
  libavformat/riff.c and two functions to access them from
  libavformat/utils.c.

Most of the headers are copied from FFmpeg revision 19452 with only
the include guard names changed. A "common.h" include in bswap.h was
changed to "libavutil/common.h" as it should use the installed header.
Taglists.c contains snippets from the relevant files with some
changes like renamed identifiers.

1 files changed, 61 insertions, 0 deletions

diff --git a/ffmpeg_files/x86/bswap.h b/ffmpeg_files/x86/bswap.h
new file mode 100644
index 0000000000..62238d178a
--- /dev/null
+++ b/ffmpeg_files/x86/bswap.h
@@ -0,0 +1,61 @@
+/*
+ * 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
+ */
+
+/**
+ * @file libavutil/x86/bswap.h
+ * byte swapping routines
+ */
+
+#ifndef MP_AVUTIL_X86_BSWAP_H
+#define MP_AVUTIL_X86_BSWAP_H
+
+#include <stdint.h>
+#include "config.h"
+#include "libavutil/common.h"
+
+#define bswap_16 bswap_16
+static av_always_inline av_const uint16_t bswap_16(uint16_t x)
+{
+    __asm__("rorw $8, %0" : "+r"(x));
+    return x;
+}
+
+#define bswap_32 bswap_32
+static av_always_inline av_const uint32_t bswap_32(uint32_t x)
+{
+#if HAVE_BSWAP
+    __asm__("bswap   %0" : "+r" (x));
+#else
+    __asm__("rorw    $8,  %w0 \n\t"
+            "rorl    $16, %0  \n\t"
+            "rorw    $8,  %w0"
+            : "+r"(x));
+#endif
+    return x;
+}
+
+#if ARCH_X86_64
+#define bswap_64 bswap_64
+static inline uint64_t av_const bswap_64(uint64_t x)
+{
+    __asm__("bswap  %0": "=r" (x) : "0" (x));
+    return x;
+}
+#endif
+
+#endif /* AVUTIL_X86_BSWAP_H */