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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /third_party/aom/av1/encoder/cost.h
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/aom/av1/encoder/cost.h')
-rw-r--r--third_party/aom/av1/encoder/cost.h51
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+/*
+ * 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_AV1_ENCODER_COST_H_
+#define AOM_AV1_ENCODER_COST_H_
+
+#include "aom_dsp/prob.h"
+#include "aom/aom_integer.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern const uint16_t av1_prob_cost[128];
+
+// The factor to scale from cost in bits to cost in av1_prob_cost units.
+#define AV1_PROB_COST_SHIFT 9
+
+// Cost of coding an n bit literal, using 128 (i.e. 50%) probability
+// for each bit.
+#define av1_cost_literal(n) ((n) * (1 << AV1_PROB_COST_SHIFT))
+
+// Calculate the cost of a symbol with probability p15 / 2^15
+static INLINE int av1_cost_symbol(aom_cdf_prob p15) {
+ // p15 can be out of range [1, CDF_PROB_TOP - 1]. Clamping it, so that the
+ // following cost calculation works correctly. Otherwise, if p15 =
+ // CDF_PROB_TOP, shift would be -1, and "p15 << shift" would be wrong.
+ p15 = (aom_cdf_prob)clamp(p15, 1, CDF_PROB_TOP - 1);
+ assert(0 < p15 && p15 < CDF_PROB_TOP);
+ const int shift = CDF_PROB_BITS - 1 - get_msb(p15);
+ const int prob = get_prob(p15 << shift, CDF_PROB_TOP);
+ assert(prob >= 128);
+ return av1_prob_cost[prob - 128] + av1_cost_literal(shift);
+}
+
+void av1_cost_tokens_from_cdf(int *costs, const aom_cdf_prob *cdf,
+ const int *inv_map);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // AOM_AV1_ENCODER_COST_H_