h265_inline.cc (1056B)
1 /* 2 * Copyright (c) 2023 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "common_video/h265/h265_inline.h" 12 13 #include <cstdint> 14 15 // Table used by WebRtcVideo_CountLeadingZeros32_NotBuiltin. For each uint32_t n 16 // that's a sequence of 0 bits followed by a sequence of 1 bits, the entry at 17 // index (n * 0x8c0b2891) >> 26 in this table gives the number of zero bits in 18 // n. 19 const int8_t kWebRtcVideo_CountLeadingZeros32_Table[64] = { 20 32, 8, 17, -1, -1, 14, -1, -1, -1, 20, -1, -1, -1, 28, -1, 18, 21 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 26, 25, 24, 22 4, 11, 23, 31, 3, 7, 10, 16, 22, 30, -1, -1, 2, 6, 13, 9, 23 -1, 15, -1, 21, -1, 29, 19, -1, -1, -1, -1, -1, 1, 27, 5, 12, 24 };