1 /* 2 * Copyright (c) 2013 The WebM 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 "./vpxstats.h" 12 13 #include <math.h> 14 #include <stdlib.h> 15 #include <string.h> 16 17 #include "./tools_common.h" 18 19 int stats_open_file(stats_io_t *stats, const char *fpf, int pass) { 20 int res; 21 stats->pass = pass; 22 23 if (pass == 0) { 24 stats->file = fopen(fpf, "wb"); 25 stats->buf.sz = 0; 26 stats->buf.buf = NULL; 27 res = (stats->file != NULL); 28 } else { 29 #if USE_POSIX_MMAP 30 struct stat stat_buf; 31 int fd; 32 33 fd = open(fpf, O_RDONLY); 34 stats->file = fdopen(fd, "rb"); 35 fstat(fd, &stat_buf); 36 stats->buf.sz = stat_buf.st_size; 37 stats->buf.buf = mmap(NULL, stats->buf.sz, PROT_READ, MAP_PRIVATE, fd, 0); 38 res = (stats->buf.buf != NULL); 39 #else 40 size_t nbytes; 41 42 stats->file = fopen(fpf, "rb"); 43 44 if (fseek(stats->file, 0, SEEK_END)) 45 fatal("First-pass stats file must be seekable!"); 46 47 stats->buf.sz = stats->buf_alloc_sz = ftell(stats->file); 48 rewind(stats->file); 49 50 stats->buf.buf = malloc(stats->buf_alloc_sz); 51 52 if (!stats->buf.buf) 53 fatal("Failed to allocate first-pass stats buffer (%lu bytes)", 54 (unsigned int)stats->buf_alloc_sz); 55 56 nbytes = fread(stats->buf.buf, 1, stats->buf.sz, stats->file); 57 res = (nbytes == stats->buf.sz); 58 #endif /* USE_POSIX_MMAP */ 59 } 60 61 return res; 62 } 63 64 int stats_open_mem(stats_io_t *stats, int pass) { 65 int res; 66 stats->pass = pass; 67 68 if (!pass) { 69 stats->buf.sz = 0; 70 stats->buf_alloc_sz = 64 * 1024; 71 stats->buf.buf = malloc(stats->buf_alloc_sz); 72 } 73 74 stats->buf_ptr = stats->buf.buf; 75 res = (stats->buf.buf != NULL); 76 return res; 77 } 78 79 void stats_close(stats_io_t *stats, int last_pass) { 80 if (stats->file) { 81 if (stats->pass == last_pass) { 82 #if USE_POSIX_MMAP 83 munmap(stats->buf.buf, stats->buf.sz); 84 #else 85 free(stats->buf.buf); 86 #endif /* USE_POSIX_MMAP */ 87 } 88 89 fclose(stats->file); 90 stats->file = NULL; 91 } else { 92 if (stats->pass == last_pass) 93 free(stats->buf.buf); 94 } 95 } 96 97 void stats_write(stats_io_t *stats, const void *pkt, size_t len) { 98 if (stats->file) { 99 (void) fwrite(pkt, 1, len, stats->file); 100 } else { 101 if (stats->buf.sz + len > stats->buf_alloc_sz) { 102 size_t new_sz = stats->buf_alloc_sz + 64 * 1024; 103 char *new_ptr = realloc(stats->buf.buf, new_sz); 104 105 if (new_ptr) { 106 stats->buf_ptr = new_ptr + (stats->buf_ptr - (char *)stats->buf.buf); 107 stats->buf.buf = new_ptr; 108 stats->buf_alloc_sz = new_sz; 109 } else { 110 fatal("Failed to realloc firstpass stats buffer."); 111 } 112 } 113 114 memcpy(stats->buf_ptr, pkt, len); 115 stats->buf.sz += len; 116 stats->buf_ptr += len; 117 } 118 } 119 120 vpx_fixed_buf_t stats_get(stats_io_t *stats) { 121 return stats->buf; 122 } 123 124 double vp8_mse2psnr(double samples, double peak, double mse) { 125 const int kMaxPSNR = 100; 126 double psnr = kMaxPSNR; 127 128 if (mse > 0.0) 129 psnr = 10.0 * log10(peak * peak * samples / mse); 130 131 if (psnr > kMaxPSNR) 132 psnr = kMaxPSNR; 133 134 return psnr; 135 } 136
