Move aom source to a sub-directory under media/libaom

There is no damned reason to treat this differently than any other media lib given its license and there never was.

1 files changed, 51 insertions, 0 deletions

diff --git a/media/libaom/src/av1/encoder/x86/hash_sse42.c b/media/libaom/src/av1/encoder/x86/hash_sse42.c
new file mode 100644
index 000000000..65fa46311
--- /dev/null
+++ b/media/libaom/src/av1/encoder/x86/hash_sse42.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2018, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include <stdint.h>
+#include <smmintrin.h>
+
+// Byte-boundary alignment issues
+#define ALIGN_SIZE 8
+#define ALIGN_MASK (ALIGN_SIZE - 1)
+
+#define CALC_CRC(op, crc, type, buf, len) \
+  while ((len) >= sizeof(type)) {         \
+    (crc) = op((crc), *(type *)(buf));    \
+    (len) -= sizeof(type);                \
+    buf += sizeof(type);                  \
+  }
+
+/**
+ * Calculates 32-bit CRC for the input buffer
+ * polynomial is 0x11EDC6F41
+ * @return A 32-bit unsigned integer representing the CRC
+ */
+uint32_t av1_get_crc32c_value_sse4_2(void *crc_calculator, uint8_t *p,
+                                     size_t len) {
+  (void)crc_calculator;
+  const uint8_t *buf = p;
+  uint32_t crc = 0xFFFFFFFF;
+
+  // Align the input to the word boundary
+  for (; (len > 0) && ((intptr_t)buf & ALIGN_MASK); len--, buf++) {
+    crc = _mm_crc32_u8(crc, *buf);
+  }
+
+#ifdef __x86_64__
+  uint64_t crc64 = crc;
+  CALC_CRC(_mm_crc32_u64, crc64, uint64_t, buf, len);
+  crc = (uint32_t)crc64;
+#endif
+  CALC_CRC(_mm_crc32_u32, crc, uint32_t, buf, len);
+  CALC_CRC(_mm_crc32_u16, crc, uint16_t, buf, len);
+  CALC_CRC(_mm_crc32_u8, crc, uint8_t, buf, len);
+  return (crc ^= 0xFFFFFFFF);
+}