mirror of
https://github.com/mpv-player/mpv
synced 2024-12-28 01:52:19 +00:00
64bb9c092a
To avoid taking a dependency on ffmpeg 5.1 before we're ready (we need a newer Ubuntu LTS release to drop ffmpeg 4.x support), ut not force us to wait to add support for picking Vulkan devices by UUID, I'm copying the uuid code from ffmpeg into mpv. It's one file with no private dependencies, so it's easier to copy than to reimplement in any other way. Licence is LGPL so matches us.
147 lines
4.8 KiB
C
147 lines
4.8 KiB
C
/*
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* Copyright (c) 2022 Pierre-Anthony Lemieux <pal@palemieux.com>
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* Zane van Iperen <zane@zanevaniperen.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* UUID parsing and serialization utilities.
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* The library treats the UUID as an opaque sequence of 16 unsigned bytes,
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* i.e. ignoring the internal layout of the UUID, which depends on the type
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* of the UUID.
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*
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* @author Pierre-Anthony Lemieux <pal@palemieux.com>
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* @author Zane van Iperen <zane@zanevaniperen.com>
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*/
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#ifndef AVUTIL_UUID_H
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#define AVUTIL_UUID_H
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#include <stdint.h>
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#include <string.h>
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#define AV_PRI_UUID \
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"%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-" \
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"%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
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#define AV_PRI_URN_UUID \
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"urn:uuid:%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-" \
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"%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
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/* AV_UUID_ARG() is used together with AV_PRI_UUID() or AV_PRI_URN_UUID
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* to print UUIDs, e.g.
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* av_log(NULL, AV_LOG_DEBUG, "UUID: " AV_PRI_UUID, AV_UUID_ARG(uuid));
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*/
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#define AV_UUID_ARG(x) \
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(x)[ 0], (x)[ 1], (x)[ 2], (x)[ 3], \
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(x)[ 4], (x)[ 5], (x)[ 6], (x)[ 7], \
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(x)[ 8], (x)[ 9], (x)[10], (x)[11], \
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(x)[12], (x)[13], (x)[14], (x)[15]
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#define AV_UUID_LEN 16
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/* Binary representation of a UUID */
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typedef uint8_t AVUUID[AV_UUID_LEN];
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/**
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* Parses a string representation of a UUID formatted according to IETF RFC 4122
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* into an AVUUID. The parsing is case-insensitive. The string must be 37
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* characters long, including the terminating NUL character.
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*
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* Example string representation: "2fceebd0-7017-433d-bafb-d073a7116696"
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*
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* @param[in] in String representation of a UUID,
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* e.g. 2fceebd0-7017-433d-bafb-d073a7116696
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* @param[out] uu AVUUID
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* @return A non-zero value in case of an error.
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*/
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int av_uuid_parse(const char *in, AVUUID uu);
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/**
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* Parses a URN representation of a UUID, as specified at IETF RFC 4122,
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* into an AVUUID. The parsing is case-insensitive. The string must be 46
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* characters long, including the terminating NUL character.
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*
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* Example string representation: "urn:uuid:2fceebd0-7017-433d-bafb-d073a7116696"
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*
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* @param[in] in URN UUID
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* @param[out] uu AVUUID
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* @return A non-zero value in case of an error.
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*/
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int av_uuid_urn_parse(const char *in, AVUUID uu);
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/**
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* Parses a string representation of a UUID formatted according to IETF RFC 4122
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* into an AVUUID. The parsing is case-insensitive.
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*
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* @param[in] in_start Pointer to the first character of the string representation
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* @param[in] in_end Pointer to the character after the last character of the
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* string representation. That memory location is never
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* accessed. It is an error if `in_end - in_start != 36`.
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* @param[out] uu AVUUID
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* @return A non-zero value in case of an error.
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*/
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int av_uuid_parse_range(const char *in_start, const char *in_end, AVUUID uu);
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/**
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* Serializes a AVUUID into a string representation according to IETF RFC 4122.
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* The string is lowercase and always 37 characters long, including the
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* terminating NUL character.
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*
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* @param[in] uu AVUUID
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* @param[out] out Pointer to an array of no less than 37 characters.
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*/
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void av_uuid_unparse(const AVUUID uu, char *out);
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/**
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* Compares two UUIDs for equality.
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*
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* @param[in] uu1 AVUUID
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* @param[in] uu2 AVUUID
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* @return Nonzero if uu1 and uu2 are identical, 0 otherwise
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*/
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static inline int av_uuid_equal(const AVUUID uu1, const AVUUID uu2)
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{
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return memcmp(uu1, uu2, AV_UUID_LEN) == 0;
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}
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/**
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* Copies the bytes of src into dest.
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*
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* @param[out] dest AVUUID
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* @param[in] src AVUUID
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*/
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static inline void av_uuid_copy(AVUUID dest, const AVUUID src)
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{
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memcpy(dest, src, AV_UUID_LEN);
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}
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/**
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* Sets a UUID to the nil UUID, i.e. a UUID with have all
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* its 128 bits set to zero.
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*
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* @param[in,out] uu UUID to be set to the nil UUID
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*/
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static inline void av_uuid_nil(AVUUID uu)
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{
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memset(uu, 0, AV_UUID_LEN);
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}
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#endif /* AVUTIL_UUID_H */
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