2 files changed, 186 insertions, 0 deletions
diff --git a/dom/media/webrtc/common/time_profiling/timecard.c b/dom/media/webrtc/common/time_profiling/timecard.c
new file mode 100644
index 0000000000..c0218cb92d
--- /dev/null
+++ b/dom/media/webrtc/common/time_profiling/timecard.c
@@ -0,0 +1,112 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <stdio.h>
+#include <string.h>
+#include "timecard.h"
+#include "mozilla/mozalloc.h"
+
+Timecard* create_timecard() {
+  Timecard* tc = moz_xcalloc(1, sizeof(Timecard));
+  tc->entries_allocated = TIMECARD_INITIAL_TABLE_SIZE;
+  tc->entries = moz_xcalloc(tc->entries_allocated, sizeof(TimecardEntry));
+  tc->start_time = PR_Now();
+  return tc;
+}
+
+void destroy_timecard(Timecard* tc) {
+  free(tc->entries);
+  free(tc);
+}
+
+void stamp_timecard(Timecard* tc, const char* event, const char* file,
+                    unsigned int line, const char* function) {
+  TimecardEntry* entry = NULL;
+
+  /* Trim the path component from the filename */
+  const char* last_slash = file;
+  while (*file) {
+    if (*file == '/' || *file == '\\') {
+      last_slash = file;
+    }
+    file++;
+  }
+  file = last_slash;
+  if (*file == '/' || *file == '\\') {
+    file++;
+  }
+
+  /* Ensure there is enough space left in the entries list */
+  if (tc->curr_entry == tc->entries_allocated) {
+    tc->entries_allocated *= 2;
+    tc->entries = moz_xrealloc(tc->entries,
+                               tc->entries_allocated * sizeof(TimecardEntry));
+  }
+
+  /* Record the data into the timecard entry */
+  entry = &tc->entries[tc->curr_entry];
+  entry->timestamp = PR_Now();
+  entry->event = event;
+  entry->file = file;
+  entry->line = line;
+  entry->function = function;
+  tc->curr_entry++;
+}
+
+void print_timecard(Timecard* tc) {
+  size_t i;
+  TimecardEntry* entry;
+  size_t event_width = 5;
+  size_t file_width = 4;
+  size_t function_width = 8;
+  size_t line_width;
+  PRTime offset, delta;
+
+  for (i = 0; i < tc->curr_entry; i++) {
+    entry = &tc->entries[i];
+    if (strlen(entry->event) > event_width) {
+      event_width = strlen(entry->event);
+    }
+    if (strlen(entry->file) > file_width) {
+      file_width = strlen(entry->file);
+    }
+    if (strlen(entry->function) > function_width) {
+      function_width = strlen(entry->function);
+    }
+  }
+
+  printf("\nTimecard created %4ld.%6.6ld\n\n",
+         (long)(tc->start_time / PR_USEC_PER_SEC),
+         (long)(tc->start_time % PR_USEC_PER_SEC));
+
+  line_width =
+      1 + 11 + 11 + event_width + file_width + 6 + function_width + (4 * 3);
+
+  printf(" %-11s | %-11s | %-*s | %-*s | %-*s\n", "Timestamp", "Delta",
+         (int)event_width, "Event", (int)file_width + 6, "File",
+         (int)function_width, "Function");
+
+  for (i = 0; i <= line_width; i++) {
+    printf("=");
+  }
+  printf("\n");
+
+  for (i = 0; i < tc->curr_entry; i++) {
+    entry = &tc->entries[i];
+    offset = entry->timestamp - tc->start_time;
+    if (i > 0) {
+      delta = entry->timestamp - tc->entries[i - 1].timestamp;
+    } else {
+      delta = entry->timestamp - tc->start_time;
+    }
+    printf(" %4ld.%6.6ld | %4ld.%6.6ld | %-*s | %*s:%-5d | %-*s\n",
+           (long)(offset / PR_USEC_PER_SEC), (long)(offset % PR_USEC_PER_SEC),
+           (long)(delta / PR_USEC_PER_SEC), (long)(delta % PR_USEC_PER_SEC),
+           (int)event_width, entry->event, (int)file_width, entry->file,
+           entry->line, (int)function_width, entry->function);
+  }
+  printf("\n");
+}
diff --git a/dom/media/webrtc/common/time_profiling/timecard.h b/dom/media/webrtc/common/time_profiling/timecard.h
new file mode 100644
index 0000000000..38d4a8d1ec
--- /dev/null
+++ b/dom/media/webrtc/common/time_profiling/timecard.h
@@ -0,0 +1,74 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef timecard_h__
+#define timecard_h__
+
+#include <stdlib.h>
+#include "prtime.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define STAMP_TIMECARD(card, event)                                      \
+  do {                                                                   \
+    if (card) {                                                          \
+      stamp_timecard((card), (event), __FILE__, __LINE__, __FUNCTION__); \
+    }                                                                    \
+  } while (0)
+
+#define TIMECARD_INITIAL_TABLE_SIZE 16
+
+/*
+ * The "const char *" members of this structure point to static strings.
+ * We do not own them, and should not attempt to deallocate them.
+ */
+
+typedef struct {
+  PRTime timestamp;
+  const char* event;
+  const char* file;
+  unsigned int line;
+  const char* function;
+} TimecardEntry;
+
+typedef struct Timecard {
+  size_t curr_entry;
+  size_t entries_allocated;
+  TimecardEntry* entries;
+  PRTime start_time;
+} Timecard;
+
+/**
+ * Creates a new Timecard structure for tracking events.
+ */
+Timecard* create_timecard();
+
+/**
+ * Frees the memory associated with a timecard. After returning, the
+ * timecard pointed to by tc is no longer valid.
+ */
+void destroy_timecard(Timecard* tc);
+
+/**
+ * Records a new event in the indicated timecard. This should not be
+ * called directly; code should instead use the STAMP_TIMECARD macro,
+ * above.
+ */
+void stamp_timecard(Timecard* tc, const char* event, const char* file,
+                    unsigned int line, const char* function);
+
+/**
+ * Formats and outputs the contents of a timecard onto stdout.
+ */
+void print_timecard(Timecard* tc);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif