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.

2 files changed, 150 insertions, 0 deletions

diff --git a/ffmpeg_files/arm/bswap.h b/ffmpeg_files/arm/bswap.h
new file mode 100644
index 0000000000..98147449b1
--- /dev/null
+++ b/ffmpeg_files/arm/bswap.h
@@ -0,0 +1,72 @@
+/*
+ * 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
+ */
+
+#ifndef MP_AVUTIL_ARM_BSWAP_H
+#define MP_AVUTIL_ARM_BSWAP_H
+
+#include <stdint.h>
+#include "config.h"
+#include "libavutil/common.h"
+
+#ifdef __ARMCC_VERSION
+
+#if HAVE_ARMV6
+#define bswap_16 bswap_16
+static av_always_inline av_const uint16_t bswap_16(uint16_t x)
+{
+    __asm { rev16 x, x }
+    return x;
+}
+
+#define bswap_32 bswap_32
+static av_always_inline av_const uint32_t bswap_32(uint32_t x)
+{
+    return __rev(x);
+}
+#endif /* HAVE_ARMV6 */
+
+#elif HAVE_INLINE_ASM
+
+#if HAVE_ARMV6
+#define bswap_16 bswap_16
+static av_always_inline av_const uint16_t bswap_16(uint16_t x)
+{
+    __asm__("rev16 %0, %0" : "+r"(x));
+    return x;
+}
+#endif
+
+#define bswap_32 bswap_32
+static av_always_inline av_const uint32_t bswap_32(uint32_t x)
+{
+#if HAVE_ARMV6
+    __asm__("rev %0, %0" : "+r"(x));
+#else
+    uint32_t t;
+    __asm__ ("eor %1, %0, %0, ror #16 \n\t"
+             "bic %1, %1, #0xFF0000   \n\t"
+             "mov %0, %0, ror #8      \n\t"
+             "eor %0, %0, %1, lsr #8  \n\t"
+             : "+r"(x), "=&r"(t));
+#endif /* HAVE_ARMV6 */
+    return x;
+}
+
+#endif /* __ARMCC_VERSION */
+
+#endif /* AVUTIL_ARM_BSWAP_H */
diff --git a/ffmpeg_files/arm/intreadwrite.h b/ffmpeg_files/arm/intreadwrite.h
new file mode 100644
index 0000000000..34b5ec8e4a
--- /dev/null
+++ b/ffmpeg_files/arm/intreadwrite.h
@@ -0,0 +1,78 @@
+/*
+ * 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
+ */
+
+#ifndef MP_AVUTIL_ARM_INTREADWRITE_H
+#define MP_AVUTIL_ARM_INTREADWRITE_H
+
+#include <stdint.h>
+#include "config.h"
+
+#if HAVE_FAST_UNALIGNED && HAVE_INLINE_ASM
+
+#define AV_RN16 AV_RN16
+static inline uint16_t AV_RN16(const void *p)
+{
+    uint16_t v;
+    __asm__ ("ldrh %0, %1" : "=r"(v) : "m"(*(const uint16_t *)p));
+    return v;
+}
+
+#define AV_WN16 AV_WN16
+static inline void AV_WN16(void *p, uint16_t v)
+{
+    __asm__ ("strh %1, %0" : "=m"(*(uint16_t *)p) : "r"(v));
+}
+
+#define AV_RN32 AV_RN32
+static inline uint32_t AV_RN32(const void *p)
+{
+    uint32_t v;
+    __asm__ ("ldr  %0, %1" : "=r"(v) : "m"(*(const uint32_t *)p));
+    return v;
+}
+
+#define AV_WN32 AV_WN32
+static inline void AV_WN32(void *p, uint32_t v)
+{
+    __asm__ ("str  %1, %0" : "=m"(*(uint32_t *)p) : "r"(v));
+}
+
+#define AV_RN64 AV_RN64
+static inline uint64_t AV_RN64(const void *p)
+{
+    union { uint64_t v; uint32_t hl[2]; } v;
+    __asm__ ("ldr   %0, %2  \n\t"
+             "ldr   %1, %3  \n\t"
+             : "=r"(v.hl[0]), "=r"(v.hl[1])
+             : "m"(*(const uint32_t*)p), "m"(*((const uint32_t*)p+1)));
+    return v.v;
+}
+
+#define AV_WN64 AV_WN64
+static inline void AV_WN64(void *p, uint64_t v)
+{
+    union { uint64_t v; uint32_t hl[2]; } vv = { v };
+    __asm__ ("str  %2, %0  \n\t"
+             "str  %3, %1  \n\t"
+             : "=m"(*(uint32_t*)p), "=m"(*((uint32_t*)p+1))
+             : "r"(vv.hl[0]), "r"(vv.hl[1]));
+}
+
+#endif /* HAVE_INLINE_ASM */
+
+#endif /* AVUTIL_ARM_INTREADWRITE_H */