diff options
Diffstat (limited to 'libvpx/vpxstats.c')
-rw-r--r-- | libvpx/vpxstats.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/libvpx/vpxstats.c b/libvpx/vpxstats.c new file mode 100644 index 0000000..70cea3e --- /dev/null +++ b/libvpx/vpxstats.c @@ -0,0 +1,135 @@ +/* + * 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; +} |