Fix ANRs due to Widevine DRM plugin sniff taking too long.

Add a Widevine-specific format sniffer to avoid having to
refetch data from the remote server.

Change-Id: I5fdb21fe7a0d6e74f2a6f06e6fbf8070b068ac60
related-to-bug: 5725548

Author: jefftinker

media/libstagefright/AwesomePlayer.cpp

@@ -2055,14 +2055,16 @@ status_t AwesomePlayer::finishSetDataSource_l() {
         String8 mimeType;
         float confidence;
         sp<AMessage> dummy;
-        bool success = SniffDRM(dataSource, &mimeType, &confidence, &dummy);
+        bool success = SniffWVM(dataSource, &mimeType, &confidence, &dummy);
 
         if (!success
                 || strcasecmp(
                     mimeType.string(), MEDIA_MIMETYPE_CONTAINER_WVM)) {
             return ERROR_UNSUPPORTED;
         }
 
+        dataSource->DrmInitialization();
+
         mWVMExtractor = new WVMExtractor(dataSource);
         mWVMExtractor->setAdaptiveStreamingMode(true);
         extractor = mWVMExtractor;

media/libstagefright/DRMExtractor.cpp

@@ -282,13 +282,13 @@ bool SniffDRM(
     if (decryptHandle != NULL) {
         if (decryptHandle->decryptApiType == DecryptApiType::CONTAINER_BASED) {
             *mimeType = String8("drm+container_based+") + decryptHandle->mimeType;
+            *confidence = 10.0f;
         } else if (decryptHandle->decryptApiType == DecryptApiType::ELEMENTARY_STREAM_BASED) {
             *mimeType = String8("drm+es_based+") + decryptHandle->mimeType;
-        } else if (decryptHandle->decryptApiType == DecryptApiType::WV_BASED) {
-            *mimeType = MEDIA_MIMETYPE_CONTAINER_WVM;
-            LOGW("SniffWVM: found match\n");
+            *confidence = 10.0f;
+        } else {
+            return false;
         }
-        *confidence = 10.0f;
 
         return true;
     }

media/libstagefright/DataSource.cpp

@@ -27,6 +27,7 @@
 #include "include/DRMExtractor.h"
 #include "include/FLACExtractor.h"
 #include "include/AACExtractor.h"
+#include "include/WVMExtractor.h"
 
 #include "matroska/MatroskaExtractor.h"
 
@@ -115,6 +116,7 @@ void DataSource::RegisterDefaultSniffers() {
     RegisterSniffer(SniffAAC);
     RegisterSniffer(SniffAVI);
     RegisterSniffer(SniffMPEG2PS);
+    RegisterSniffer(SniffWVM);
 
     char value[PROPERTY_VALUE_MAX];
     if (property_get("drm.service.enabled", value, NULL)

media/libstagefright/WVMExtractor.cpp

@@ -45,17 +45,12 @@ namespace android {
 static Mutex gWVMutex;
 
 WVMExtractor::WVMExtractor(const sp<DataSource> &source)
-    : mDataSource(source) {
-    {
-        Mutex::Autolock autoLock(gWVMutex);
-        if (gVendorLibHandle == NULL) {
-            gVendorLibHandle = dlopen("libwvm.so", RTLD_NOW);
-        }
+    : mDataSource(source)
+{
+    Mutex::Autolock autoLock(gWVMutex);
 
-        if (gVendorLibHandle == NULL) {
-            LOGE("Failed to open libwvm.so");
-            return;
-        }
+    if (!getVendorLibHandle()) {
+        return;
     }
 
     typedef WVMLoadableExtractor *(*GetInstanceFunc)(sp<DataSource>);
@@ -71,6 +66,19 @@ WVMExtractor::WVMExtractor(const sp<DataSource> &source)
     }
 }
 
+bool WVMExtractor::getVendorLibHandle()
+{
+    if (gVendorLibHandle == NULL) {
+        gVendorLibHandle = dlopen("libwvm.so", RTLD_NOW);
+    }
+
+    if (gVendorLibHandle == NULL) {
+        LOGE("Failed to open libwvm.so");
+    }
+
+    return gVendorLibHandle != NULL;
+}
+
 WVMExtractor::~WVMExtractor() {
 }
 
@@ -113,5 +121,33 @@ void WVMExtractor::setAdaptiveStreamingMode(bool adaptive) {
     }
 }
 
+bool SniffWVM(
+    const sp<DataSource> &source, String8 *mimeType, float *confidence,
+        sp<AMessage> *) {
+
+    Mutex::Autolock autoLock(gWVMutex);
+
+    if (!WVMExtractor::getVendorLibHandle()) {
+        return false;
+    }
+
+    typedef WVMLoadableExtractor *(*SnifferFunc)(sp<DataSource>);
+    SnifferFunc snifferFunc =
+        (SnifferFunc) dlsym(gVendorLibHandle,
+                            "_ZN7android15IsWidevineMediaENS_2spINS_10DataSourceEEE");
+
+    if (snifferFunc) {
+        if ((*snifferFunc)(source)) {
+            *mimeType = MEDIA_MIMETYPE_CONTAINER_WVM;
+            *confidence = 10.0f;
+            return true;
+        }
+    } else {
+        LOGE("IsWidevineMedia not found in libwvm.so");
+    }
+
+    return false;
+}
+
 } //namespace android
 

media/libstagefright/include/WVMExtractor.h

@@ -23,6 +23,8 @@
 
 namespace android {
 
+struct AMessage;
+class String8;
 class DataSource;
 
 class WVMLoadableExtractor : public MediaExtractor {
@@ -58,6 +60,8 @@ class WVMExtractor : public MediaExtractor {
     // is used.
     void setAdaptiveStreamingMode(bool adaptive);
 
+    static bool getVendorLibHandle();
+
 protected:
     virtual ~WVMExtractor();
 
@@ -69,6 +73,10 @@ class WVMExtractor : public MediaExtractor {
     WVMExtractor &operator=(const WVMExtractor &);
 };
 
+bool SniffWVM(
+        const sp<DataSource> &source, String8 *mimeType, float *confidence,
+        sp<AMessage> *);
+
 }  // namespace android
 
 #endif  // DRM_EXTRACTOR_H_