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/*
* Copyright (c) 2013 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "./vpxstats.h"
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "./tools_common.h"
int stats_open_file(stats_io_t *stats, const char *fpf, int pass) {
int res;
stats->pass = pass;
if (pass == 0) {
stats->file = fopen(fpf, "wb");
stats->buf.sz = 0;
stats->buf.buf = NULL;
res = (stats->file != NULL);
} else {
#if USE_POSIX_MMAP
struct stat stat_buf;
int fd;
fd = open(fpf, O_RDONLY);
stats->file = fdopen(fd, "rb");
fstat(fd, &stat_buf);
stats->buf.sz = stat_buf.st_size;
stats->buf.buf = mmap(NULL, stats->buf.sz, PROT_READ, MAP_PRIVATE, fd, 0);
res = (stats->buf.buf != NULL);
#else
size_t nbytes;
stats->file = fopen(fpf, "rb");
if (fseek(stats->file, 0, SEEK_END))
fatal("First-pass stats file must be seekable!");
stats->buf.sz = stats->buf_alloc_sz = ftell(stats->file);
rewind(stats->file);
stats->buf.buf = malloc(stats->buf_alloc_sz);
if (!stats->buf.buf)
fatal("Failed to allocate first-pass stats buffer (%lu bytes)",
(unsigned int)stats->buf_alloc_sz);
nbytes = fread(stats->buf.buf, 1, stats->buf.sz, stats->file);
res = (nbytes == stats->buf.sz);
#endif /* USE_POSIX_MMAP */
}
return res;
}
int stats_open_mem(stats_io_t *stats, int pass) {
int res;
stats->pass = pass;
if (!pass) {
stats->buf.sz = 0;
stats->buf_alloc_sz = 64 * 1024;
stats->buf.buf = malloc(stats->buf_alloc_sz);
}
stats->buf_ptr = stats->buf.buf;
res = (stats->buf.buf != NULL);
return res;
}
void stats_close(stats_io_t *stats, int last_pass) {
if (stats->file) {
if (stats->pass == last_pass) {
#if USE_POSIX_MMAP
munmap(stats->buf.buf, stats->buf.sz);
#else
free(stats->buf.buf);
#endif /* USE_POSIX_MMAP */
}
fclose(stats->file);
stats->file = NULL;
} else {
if (stats->pass == last_pass)
free(stats->buf.buf);
}
}
void stats_write(stats_io_t *stats, const void *pkt, size_t len) {
if (stats->file) {
(void) fwrite(pkt, 1, len, stats->file);
} else {
if (stats->buf.sz + len > stats->buf_alloc_sz) {
size_t new_sz = stats->buf_alloc_sz + 64 * 1024;
char *new_ptr = realloc(stats->buf.buf, new_sz);
if (new_ptr) {
stats->buf_ptr = new_ptr + (stats->buf_ptr - (char *)stats->buf.buf);
stats->buf.buf = new_ptr;
stats->buf_alloc_sz = new_sz;
} else {
fatal("Failed to realloc firstpass stats buffer.");
}
}
memcpy(stats->buf_ptr, pkt, len);
stats->buf.sz += len;
stats->buf_ptr += len;
}
}
vpx_fixed_buf_t stats_get(stats_io_t *stats) {
return stats->buf;
}
double vp8_mse2psnr(double samples, double peak, double mse) {
const int kMaxPSNR = 100;
double psnr = kMaxPSNR;
if (mse > 0.0)
psnr = 10.0 * log10(peak * peak * samples / mse);
if (psnr > kMaxPSNR)
psnr = kMaxPSNR;
return psnr;
}
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