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, 104 insertions, 0 deletions

diff --git a/third_party/aom/aom_dsp/dkboolwriter.h b/third_party/aom/aom_dsp/dkboolwriter.h
new file mode 100644
index 000000000..835436885
--- /dev/null
+++ b/third_party/aom/aom_dsp/dkboolwriter.h
@@ -0,0 +1,104 @@
+/*
+ * 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.
+ */
+
+#ifndef AOM_DSP_DKBOOLWRITER_H_
+#define AOM_DSP_DKBOOLWRITER_H_
+
+#include "./aom_config.h"
+
+#if CONFIG_BITSTREAM_DEBUG
+#include <stdio.h>
+#include "aom_util/debug_util.h"
+#endif  // CONFIG_BITSTREAM_DEBUG
+
+#include "aom_dsp/prob.h"
+#include "aom_ports/mem.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct aom_dk_writer {
+  unsigned int lowvalue;
+  unsigned int range;
+  int count;
+  unsigned int pos;
+  uint8_t *buffer;
+} aom_dk_writer;
+
+void aom_dk_start_encode(aom_dk_writer *bc, uint8_t *buffer);
+void aom_dk_stop_encode(aom_dk_writer *bc);
+
+static INLINE void aom_dk_write(aom_dk_writer *br, int bit, int probability) {
+  unsigned int split;
+  int count = br->count;
+  unsigned int range = br->range;
+  unsigned int lowvalue = br->lowvalue;
+  register int shift;
+
+#if CONFIG_BITSTREAM_DEBUG
+  // int queue_r = 0;
+  // int frame_idx_r = 0;
+  // int queue_w = bitstream_queue_get_write();
+  // int frame_idx_w = bitstream_queue_get_frame_write();
+  // if (frame_idx_w == frame_idx_r && queue_w == queue_r) {
+  //   fprintf(stderr, "\n *** bitstream queue at frame_idx_w %d queue_w %d\n",
+  //   frame_idx_w, queue_w);
+  // }
+  bitstream_queue_push(bit, probability);
+#endif  // CONFIG_BITSTREAM_DEBUG
+
+  split = 1 + (((range - 1) * probability) >> 8);
+
+  range = split;
+
+  if (bit) {
+    lowvalue += split;
+    range = br->range - split;
+  }
+
+  shift = aom_norm[range];
+
+  range <<= shift;
+  count += shift;
+
+  if (count >= 0) {
+    int offset = shift - count;
+
+    if ((lowvalue << (offset - 1)) & 0x80000000) {
+      int x = br->pos - 1;
+
+      while (x >= 0 && br->buffer[x] == 0xff) {
+        br->buffer[x] = 0;
+        x--;
+      }
+
+      br->buffer[x] += 1;
+    }
+
+    br->buffer[br->pos++] = (lowvalue >> (24 - offset));
+    lowvalue <<= offset;
+    shift = count;
+    lowvalue &= 0xffffff;
+    count -= 8;
+  }
+
+  lowvalue <<= shift;
+  br->count = count;
+  br->lowvalue = lowvalue;
+  br->range = range;
+}
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AOM_DSP_DKBOOLWRITER_H_