Import aom library

This is the reference implementation for the Alliance for Open Media's av1 video code.

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

1 files changed, 200 insertions, 0 deletions

diff --git a/third_party/aom/aom_scale/generic/gen_scalers.c b/third_party/aom/aom_scale/generic/gen_scalers.c
new file mode 100644
index 000000000..71fa82f30
--- /dev/null
+++ b/third_party/aom/aom_scale/generic/gen_scalers.c
@@ -0,0 +1,200 @@
+/*
+ * Copyright (c) 2016, 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 "./aom_scale_rtcd.h"
+#include "aom_scale/aom_scale.h"
+#include "aom_mem/aom_mem.h"
+/****************************************************************************
+*  Imports
+****************************************************************************/
+
+/****************************************************************************
+ *
+ *
+ *  INPUTS        : const unsigned char *source : Pointer to source data.
+ *                  unsigned int source_width   : Stride of source.
+ *                  unsigned char *dest         : Pointer to destination data.
+ *                  unsigned int dest_width     : Stride of destination
+ *                                                (NOT USED).
+ *
+ *  OUTPUTS       : None.
+ *
+ *  RETURNS       : void
+ *
+ *  FUNCTION      : Copies horizontal line of pixels from source to
+ *                  destination scaling up by 4 to 5.
+ *
+ *  SPECIAL NOTES : None.
+ *
+ ****************************************************************************/
+void aom_horizontal_line_5_4_scale_c(const unsigned char *source,
+                                     unsigned int source_width,
+                                     unsigned char *dest,
+                                     unsigned int dest_width) {
+  const unsigned char *const source_end = source + source_width;
+  (void)dest_width;
+
+  while (source < source_end) {
+    const unsigned int a = source[0];
+    const unsigned int b = source[1];
+    const unsigned int c = source[2];
+    const unsigned int d = source[3];
+    const unsigned int e = source[4];
+
+    dest[0] = (unsigned char)a;
+    dest[1] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
+    dest[2] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
+    dest[3] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
+
+    source += 5;
+    dest += 4;
+  }
+}
+
+void aom_vertical_band_5_4_scale_c(unsigned char *source, int src_pitch,
+                                   unsigned char *dest, int dest_pitch,
+                                   unsigned int dest_width) {
+  const unsigned char *const dest_end = dest + dest_width;
+  while (dest < dest_end) {
+    const unsigned int a = source[0 * src_pitch];
+    const unsigned int b = source[1 * src_pitch];
+    const unsigned int c = source[2 * src_pitch];
+    const unsigned int d = source[3 * src_pitch];
+    const unsigned int e = source[4 * src_pitch];
+
+    dest[0 * dest_pitch] = (unsigned char)a;
+    dest[1 * dest_pitch] = (unsigned char)((b * 192 + c * 64 + 128) >> 8);
+    dest[2 * dest_pitch] = (unsigned char)((c * 128 + d * 128 + 128) >> 8);
+    dest[3 * dest_pitch] = (unsigned char)((d * 64 + e * 192 + 128) >> 8);
+
+    ++source;
+    ++dest;
+  }
+}
+
+/*7***************************************************************************
+ *
+ *  ROUTINE       : aom_horizontal_line_3_5_scale_c
+ *
+ *  INPUTS        : const unsigned char *source : Pointer to source data.
+ *                  unsigned int source_width   : Stride of source.
+ *                  unsigned char *dest         : Pointer to destination data.
+ *                  unsigned int dest_width     : Stride of destination
+ *                                                (NOT USED).
+ *
+ *  OUTPUTS       : None.
+ *
+ *  RETURNS       : void
+ *
+ *  FUNCTION      : Copies horizontal line of pixels from source to
+ *                  destination scaling up by 3 to 5.
+ *
+ *  SPECIAL NOTES : None.
+ *
+ *
+ ****************************************************************************/
+void aom_horizontal_line_5_3_scale_c(const unsigned char *source,
+                                     unsigned int source_width,
+                                     unsigned char *dest,
+                                     unsigned int dest_width) {
+  const unsigned char *const source_end = source + source_width;
+  (void)dest_width;
+  while (source < source_end) {
+    const unsigned int a = source[0];
+    const unsigned int b = source[1];
+    const unsigned int c = source[2];
+    const unsigned int d = source[3];
+    const unsigned int e = source[4];
+
+    dest[0] = (unsigned char)a;
+    dest[1] = (unsigned char)((b * 85 + c * 171 + 128) >> 8);
+    dest[2] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
+
+    source += 5;
+    dest += 3;
+  }
+}
+
+void aom_vertical_band_5_3_scale_c(unsigned char *source, int src_pitch,
+                                   unsigned char *dest, int dest_pitch,
+                                   unsigned int dest_width) {
+  const unsigned char *const dest_end = dest + dest_width;
+  while (dest < dest_end) {
+    const unsigned int a = source[0 * src_pitch];
+    const unsigned int b = source[1 * src_pitch];
+    const unsigned int c = source[2 * src_pitch];
+    const unsigned int d = source[3 * src_pitch];
+    const unsigned int e = source[4 * src_pitch];
+
+    dest[0 * dest_pitch] = (unsigned char)a;
+    dest[1 * dest_pitch] = (unsigned char)((b * 85 + c * 171 + 128) >> 8);
+    dest[2 * dest_pitch] = (unsigned char)((d * 171 + e * 85 + 128) >> 8);
+
+    ++source;
+    ++dest;
+  }
+}
+
+/****************************************************************************
+ *
+ *  ROUTINE       : aom_horizontal_line_1_2_scale_c
+ *
+ *  INPUTS        : const unsigned char *source : Pointer to source data.
+ *                  unsigned int source_width   : Stride of source.
+ *                  unsigned char *dest         : Pointer to destination data.
+ *                  unsigned int dest_width     : Stride of destination
+ *                                                (NOT USED).
+ *
+ *  OUTPUTS       : None.
+ *
+ *  RETURNS       : void
+ *
+ *  FUNCTION      : Copies horizontal line of pixels from source to
+ *                  destination scaling up by 1 to 2.
+ *
+ *  SPECIAL NOTES : None.
+ *
+ ****************************************************************************/
+void aom_horizontal_line_2_1_scale_c(const unsigned char *source,
+                                     unsigned int source_width,
+                                     unsigned char *dest,
+                                     unsigned int dest_width) {
+  const unsigned char *const source_end = source + source_width;
+  (void)dest_width;
+  while (source < source_end) {
+    dest[0] = source[0];
+    source += 2;
+    ++dest;
+  }
+}
+
+void aom_vertical_band_2_1_scale_c(unsigned char *source, int src_pitch,
+                                   unsigned char *dest, int dest_pitch,
+                                   unsigned int dest_width) {
+  (void)dest_pitch;
+  (void)src_pitch;
+  memcpy(dest, source, dest_width);
+}
+
+void aom_vertical_band_2_1_scale_i_c(unsigned char *source, int src_pitch,
+                                     unsigned char *dest, int dest_pitch,
+                                     unsigned int dest_width) {
+  const unsigned char *const dest_end = dest + dest_width;
+  (void)dest_pitch;
+  while (dest < dest_end) {
+    const unsigned int a = source[-src_pitch] * 3;
+    const unsigned int b = source[0] * 10;
+    const unsigned int c = source[src_pitch] * 3;
+    dest[0] = (unsigned char)((8 + a + b + c) >> 4);
+    ++source;
+    ++dest;
+  }
+}