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, 44 insertions, 0 deletions

diff --git a/third_party/aom/aom_dsp/dkboolwriter.c b/third_party/aom/aom_dsp/dkboolwriter.c
new file mode 100644
index 000000000..fc98e7c9b
--- /dev/null
+++ b/third_party/aom/aom_dsp/dkboolwriter.c
@@ -0,0 +1,44 @@
+/*
+ * 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 <assert.h>
+
+#include "./dkboolwriter.h"
+
+static INLINE void aom_dk_write_bit(aom_dk_writer *w, int bit) {
+  aom_dk_write(w, bit, 128);  // aom_prob_half
+}
+
+void aom_dk_start_encode(aom_dk_writer *br, uint8_t *source) {
+  br->lowvalue = 0;
+  br->range = 255;
+  br->count = -24;
+  br->buffer = source;
+  br->pos = 0;
+  aom_dk_write_bit(br, 0);
+}
+
+void aom_dk_stop_encode(aom_dk_writer *br) {
+  int i;
+
+#if CONFIG_BITSTREAM_DEBUG
+  bitstream_queue_set_skip_write(1);
+#endif  // CONFIG_BITSTREAM_DEBUG
+
+  for (i = 0; i < 32; i++) aom_dk_write_bit(br, 0);
+
+#if CONFIG_BITSTREAM_DEBUG
+  bitstream_queue_set_skip_write(0);
+#endif  // CONFIG_BITSTREAM_DEBUG
+
+  // Ensure there's no ambigous collision with any index marker bytes
+  if ((br->buffer[br->pos - 1] & 0xe0) == 0xc0) br->buffer[br->pos++] = 0;
+}