55 lines
1.0 KiB
C++
55 lines
1.0 KiB
C++
#include <math.h>
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#include <time.h>
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#include <stdlib.h>
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#include <stdint.h>
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#if defined(OS_WINDOWS) || defined(_WIN32) || defined(_WIN64)
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#include <windows.h>
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#include <wincrypt.h>
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uint32_t rtp_ssrc(void)
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{
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uint32_t seed;
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HCRYPTPROV provider;
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seed = (uint32_t)rand();
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if (CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
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CryptGenRandom(provider, sizeof(seed), (PBYTE)&seed);
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CryptReleaseContext(provider, 0);
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}
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return seed;
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}
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#elif defined(OS_LINUX) || defined(OS_MAC)
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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static int read_random(uint32_t *dst, const char *file)
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{
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int fd = open(file, O_RDONLY);
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int err = -1;
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if (fd == -1)
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return -1;
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err = (int)read(fd, dst, sizeof(*dst));
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close(fd);
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return err;
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}
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uint32_t rtp_ssrc(void)
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{
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uint32_t seed;
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if (read_random(&seed, "/dev/urandom") == sizeof(seed))
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return seed;
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if (read_random(&seed, "/dev/random") == sizeof(seed))
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return seed;
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return (uint32_t)rand();
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}
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#else
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uint32_t rtp_ssrc(void)
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{
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return rand();
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}
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#endif
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