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2134
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1 /*
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2 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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3 *
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4 * This file is part of FFmpeg.
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5 *
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6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
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8 * License as published by the Free Software Foundation; either
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9 * version 2.1 of the License, or (at your option) any later version.
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10 *
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11 * FFmpeg is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * Lesser General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU Lesser General Public
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17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 */
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20
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21 #ifndef AVUTIL_CPU_H
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22 #define AVUTIL_CPU_H
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23
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24 #include "attributes.h"
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25
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26 #define AV_CPU_FLAG_FORCE 0x80000000 /* force usage of selected flags (OR) */
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27
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28 /* lower 16 bits - CPU features */
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29 #define AV_CPU_FLAG_MMX 0x0001 ///< standard MMX
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30 #define AV_CPU_FLAG_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
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31 #define AV_CPU_FLAG_MMX2 0x0002 ///< SSE integer functions or AMD MMX ext
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32 #define AV_CPU_FLAG_3DNOW 0x0004 ///< AMD 3DNOW
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33 #define AV_CPU_FLAG_SSE 0x0008 ///< SSE functions
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34 #define AV_CPU_FLAG_SSE2 0x0010 ///< PIV SSE2 functions
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35 #define AV_CPU_FLAG_SSE2SLOW 0x40000000 ///< SSE2 supported, but usually not faster
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36 #define AV_CPU_FLAG_3DNOWEXT 0x0020 ///< AMD 3DNowExt
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37 #define AV_CPU_FLAG_SSE3 0x0040 ///< Prescott SSE3 functions
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38 #define AV_CPU_FLAG_SSE3SLOW 0x20000000 ///< SSE3 supported, but usually not faster
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39 #define AV_CPU_FLAG_SSSE3 0x0080 ///< Conroe SSSE3 functions
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40 #define AV_CPU_FLAG_ATOM 0x10000000 ///< Atom processor, some SSSE3 instructions are slower
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41 #define AV_CPU_FLAG_SSE4 0x0100 ///< Penryn SSE4.1 functions
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42 #define AV_CPU_FLAG_SSE42 0x0200 ///< Nehalem SSE4.2 functions
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43 #define AV_CPU_FLAG_AVX 0x4000 ///< AVX functions: requires OS support even if YMM registers aren't used
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44 #define AV_CPU_FLAG_XOP 0x0400 ///< Bulldozer XOP functions
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45 #define AV_CPU_FLAG_FMA4 0x0800 ///< Bulldozer FMA4 functions
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46 // #if LIBAVUTIL_VERSION_MAJOR <52
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47 #define AV_CPU_FLAG_CMOV 0x1001000 ///< supports cmov instruction
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48 // #else
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49 // #define AV_CPU_FLAG_CMOV 0x1000 ///< supports cmov instruction
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50 // #endif
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51
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52 #define AV_CPU_FLAG_ALTIVEC 0x0001 ///< standard
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53
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54 #define AV_CPU_FLAG_ARMV5TE (1 << 0)
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55 #define AV_CPU_FLAG_ARMV6 (1 << 1)
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56 #define AV_CPU_FLAG_ARMV6T2 (1 << 2)
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57 #define AV_CPU_FLAG_VFP (1 << 3)
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58 #define AV_CPU_FLAG_VFPV3 (1 << 4)
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59 #define AV_CPU_FLAG_NEON (1 << 5)
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60
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61 /**
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62 * Return the flags which specify extensions supported by the CPU.
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63 * The returned value is affected by av_force_cpu_flags() if that was used
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64 * before. So av_get_cpu_flags() can easily be used in a application to
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65 * detect the enabled cpu flags.
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66 */
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67 int av_get_cpu_flags(void);
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68
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69 /**
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70 * Disables cpu detection and forces the specified flags.
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71 * -1 is a special case that disables forcing of specific flags.
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72 */
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73 void av_force_cpu_flags(int flags);
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74
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75 /**
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76 * Set a mask on flags returned by av_get_cpu_flags().
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77 * This function is mainly useful for testing.
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78 * Please use av_force_cpu_flags() and av_get_cpu_flags() instead which are more flexible
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79 *
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80 * @warning this function is not thread safe.
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81 */
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82 attribute_deprecated void av_set_cpu_flags_mask(int mask);
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83
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84 /**
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85 * Parse CPU flags from a string.
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86 *
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87 * The returned flags contain the specified flags as well as related unspecified flags.
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88 *
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89 * This function exists only for compatibility with libav.
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90 * Please use av_parse_cpu_caps() when possible.
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91 * @return a combination of AV_CPU_* flags, negative on error.
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92 */
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93 attribute_deprecated
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94 int av_parse_cpu_flags(const char *s);
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95
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96 /**
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97 * Parse CPU caps from a string and update the given AV_CPU_* flags based on that.
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98 *
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99 * @return negative on error.
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100 */
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101 int av_parse_cpu_caps(unsigned *flags, const char *s);
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102
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103 /* The following CPU-specific functions shall not be called directly. */
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104 int ff_get_cpu_flags_arm(void);
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105 int ff_get_cpu_flags_ppc(void);
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106 int ff_get_cpu_flags_x86(void);
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107
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108 #endif /* AVUTIL_CPU_H */
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