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/*
* Copyright 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <stdlib.h>
#include <ctype.h>
#define LOG_TAG "ADebug"
#include <cutils/atomic.h>
#include <utils/Log.h>
#include <utils/misc.h>
#include <cutils/properties.h>
#include <ADebug.h>
#include <AStringUtils.h>
#include <AUtils.h>
#define UNUSED(x) ((void)(x))
namespace android {
//static
long ADebug::GetLevelFromSettingsString(
const char *name, const char *value, long def) {
// split on ,
const char *next = value, *current;
while (next != NULL) {
current = next;
next = strchr(current, ',');
if (next != NULL) {
++next; // pass ,
}
while (isspace(*current)) {
++current;
}
// check for :
char *colon = strchr(current, ':');
// get level
char *end;
errno = 0; // strtol does not clear errno, but it can be set for any return value
long level = strtol(current, &end, 10);
while (isspace(*end)) {
++end;
}
if (errno != 0 || end == current || (end != colon && *end != '\0' && end != next)) {
// invalid level - skip
continue;
}
if (colon != NULL) {
// check if pattern matches
do { // skip colon and spaces
++colon;
} while (isspace(*colon));
size_t globLen = (next == NULL ? strlen(colon) : (next - 1 - colon));
while (globLen > 0 && isspace(colon[globLen - 1])) {
--globLen; // trim glob
}
if (!AStringUtils::MatchesGlob(
colon, globLen, name, strlen(name), true /* ignoreCase */)) {
continue;
}
}
// update value
def = level;
}
return def;
}
//static
long ADebug::GetLevelFromProperty(
const char *name, const char *propertyName, long def) {
char value[PROPERTY_VALUE_MAX];
if (property_get(propertyName, value, NULL)) {
def = GetLevelFromSettingsString(name, value, def);
}
return def;
}
//static
ADebug::Level ADebug::GetDebugLevelFromProperty(
const char *name, const char *propertyName, ADebug::Level def) {
long level = GetLevelFromProperty(name, propertyName, (long)def);
return (Level)min(max(level, (long)kDebugNone), (long)kDebugMax);
}
//static
char *ADebug::GetDebugName(const char *name) {
char *debugName = strdup(name);
const char *terms[] = { "omx", "video", "audio" };
for (size_t i = 0; i < NELEM(terms) && debugName != NULL; i++) {
const char *term = terms[i];
const size_t len = strlen(term);
char *match = strcasestr(debugName, term);
if (match != NULL && (match == debugName || match[-1] == '.'
|| match[len] == '.' || match[len] == '\0')) {
char *src = match + len;
if (match == debugName || match[-1] == '.') {
src += (*src == '.'); // remove trailing or double .
}
memmove(match, src, debugName + strlen(debugName) - src + 1);
}
}
return debugName;
}
//static
bool ADebug::getExperimentFlag(
bool allow, const char *name, uint64_t modulo,
uint64_t limit, uint64_t plus, uint64_t timeDivisor) {
// see if this experiment should be disabled/enabled based on properties.
// default to 2 to allow 0/1 specification
const int undefined = 2;
long level = GetLevelFromProperty(name, "debug.stagefright.experiments", undefined);
if (level != undefined) {
ALOGI("experiment '%s': %s from property", name, level ? "ENABLED" : "disabled");
return allow && (level != 0);
}
#ifndef ENABLE_STAGEFRIGHT_AUTO_EXPERIMENTS
UNUSED(modulo);
UNUSED(limit);
UNUSED(plus);
UNUSED(timeDivisor);
return false;
#else
// Disable automatic experiments in "non-experimental" builds (that is, _all_ builds
// as there is no "experimental" build).
// TODO: change build type to enable automatic experiments in the future for some builds
char value[PROPERTY_VALUE_MAX];
if (property_get("ro.build.type", value, NULL)) {
if (strcmp(value, "experimental")) {
return false;
}
}
static volatile int32_t haveSerial = 0;
static uint64_t serialNum;
if (!android_atomic_acquire_load(&haveSerial)) {
// calculate initial counter value based on serial number
static char serial[PROPERTY_VALUE_MAX];
property_get("ro.serialno", serial, "0");
uint64_t num = 0; // it is okay for this number to overflow
for (size_t i = 0; i < NELEM(serial) && serial[i] != '\0'; ++i) {
const char &c = serial[i];
// try to use most letters of serialno
if (isdigit(c)) {
num = num * 10 + (c - '0');
} else if (islower(c)) {
num = num * 26 + (c - 'a');
} else if (isupper(c)) {
num = num * 26 + (c - 'A');
} else {
num = num * 256 + c;
}
}
serialNum = num;
android_atomic_release_store(1, &haveSerial);
}
ALOGD("serial: %llu, time: %lld", (long long unsigned)serialNum, (long long)time(NULL));
// MINOR: use modulo for counter and time, so that their sum does not
// roll over, and mess up the correlation between related experiments.
// e.g. keep (a mod 2N) = 0 impl (a mod N) = 0
time_t counter = (time(NULL) / timeDivisor) % modulo + plus + serialNum % modulo;
bool enable = allow && (counter % modulo < limit);
ALOGI("experiment '%s': %s", name, enable ? "ENABLED" : "disabled");
return enable;
#endif
}
} // namespace android
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