stagefright: add runtime debug support

Bug: 18285408
Change-Id: I56346f4652b2c5f7ef5fa3003fd8676051339384

3 files changed, 197 insertions, 0 deletions

diff --git a/media/libstagefright/foundation/ADebug.cpp b/media/libstagefright/foundation/ADebug.cpp
new file mode 100644
index 0000000..ec4a960
--- /dev/null
+++ b/media/libstagefright/foundation/ADebug.cpp
@@ -0,0 +1,117 @@
+/*
+ * 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 <utils/Log.h>
+#include <utils/misc.h>
+
+#include <cutils/properties.h>
+
+#include <ADebug.h>
+#include <AStringUtils.h>
+#include <AUtils.h>
+
+namespace android {
+
+//static
+ADebug::Level ADebug::GetDebugLevelFromString(
+        const char *name, const char *value, ADebug::Level def) {
+    // split on ,
+    const char *next = value, *current;
+    const unsigned long maxLevel = (unsigned long)kDebugMax;
+    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;  // strtoul does not clear errno, but it can be set for any return value
+        unsigned long level = strtoul(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 debug level
+        def = (Level)min(level, maxLevel);
+    }
+    return def;
+}
+
+//static
+ADebug::Level ADebug::GetDebugLevelFromProperty(
+        const char *name, const char *propertyName, ADebug::Level def) {
+    char value[PROPERTY_VALUE_MAX];
+    if (property_get(propertyName, value, NULL)) {
+        return GetDebugLevelFromString(name, value, def);
+    }
+    return def;
+}
+
+//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;
+}
+
+}  // namespace android
+
diff --git a/media/libstagefright/foundation/AStringUtils.cpp b/media/libstagefright/foundation/AStringUtils.cpp
new file mode 100644
index 0000000..e5a846c
--- /dev/null
+++ b/media/libstagefright/foundation/AStringUtils.cpp
@@ -0,0 +1,77 @@
+/*
+ * 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 <string.h>
+#include <AStringUtils.h>
+
+namespace android {
+
+// static
+int AStringUtils::Compare(const char *a, const char *b, size_t len, bool ignoreCase) {
+    // this method relies on a trailing '\0' if a or b are shorter than len
+    return ignoreCase ? strncasecmp(a, b, len) : strncmp(a, b, len);
+}
+
+// static
+bool AStringUtils::MatchesGlob(
+        const char *glob, size_t globLen, const char *str, size_t strLen, bool ignoreCase) {
+    // this method does not assume a trailing '\0'
+    size_t ix = 0, globIx = 0;
+
+    // pattern must match until first '*'
+    while (globIx < globLen && glob[globIx] != '*') {
+        ++globIx;
+    }
+    if (strLen < globIx || Compare(str, glob, globIx /* len */, ignoreCase)) {
+        return false;
+    }
+    ix = globIx;
+
+    // process by * separated sections
+    while (globIx < globLen) {
+        ++globIx;
+        size_t start = globIx;
+        while (globIx < globLen && glob[globIx] != '*') {
+            ++globIx;
+        }
+        size_t len = globIx - start;
+        const char *pattern = glob + start;
+
+        if (globIx == globLen) {
+            // last pattern must match tail
+            if (ix + len > strLen) {
+                return false;
+            }
+            const char *tail = str + strLen - len;
+            return !Compare(tail, pattern, len, ignoreCase);
+        }
+        // progress after first occurrence of pattern
+        while (ix + len <= strLen && Compare(str + ix, pattern, len, ignoreCase)) {
+            ++ix;
+        }
+        if (ix + len > strLen) {
+            return false;
+        }
+        ix += len;
+        // we will loop around as globIx < globLen
+    }
+
+    // we only get here if there were no * in the pattern
+    return ix == strLen;
+}
+
+}  // namespace android
+
diff --git a/media/libstagefright/foundation/Android.mk b/media/libstagefright/foundation/Android.mk
index 90a6a23..c1dd6ce 100644
--- a/media/libstagefright/foundation/Android.mk
+++ b/media/libstagefright/foundation/Android.mk
@@ -5,6 +5,7 @@ LOCAL_SRC_FILES:=                 \
     AAtomizer.cpp                 \
     ABitReader.cpp                \
     ABuffer.cpp                   \
+    ADebug.cpp                    \
     AHandler.cpp                  \
     AHierarchicalStateMachine.cpp \
     ALooper.cpp                   \
@@ -12,6 +13,7 @@ LOCAL_SRC_FILES:=                 \
     AMessage.cpp                  \
     ANetworkSession.cpp           \
     AString.cpp                   \
+    AStringUtils.cpp              \
     ParsedMessage.cpp             \
     base64.cpp                    \
     hexdump.cpp
@@ -22,6 +24,7 @@ LOCAL_C_INCLUDES:= \
 LOCAL_SHARED_LIBRARIES := \
         libbinder         \
         libutils          \
+        libcutils         \
         liblog
 
 LOCAL_CFLAGS += -Wno-multichar -Werror