Fixed various bugs:

- 17932674 Packager crashes when an incorrect key is provided to wvm.

- 17932293 Packager crashes if no key source is provided for wvm input.

- 17932868 StreamInfo is cast to AudioStreamInfo unconditionally and corrupts memory in wvm_media_parser

- 17932033 input: wvm --enable_fixed_key_decryption Segmentation Fault.

Change-Id: I7fc774c87a33314a4c92bc907f06c17f0c269a16

packager/media/base/key_source.cc

@@ -26,12 +26,17 @@ KeySource::~KeySource() {}
 
 Status KeySource::FetchKeys(const std::vector<uint8_t>& content_id,
                             const std::string& policy) {
-  // Do nothing for fixed key decryption.
+  // Do nothing for fixed key encryption/decryption.
   return Status::OK;
 }
 
 Status KeySource::FetchKeys(const std::vector<uint8_t>& pssh_data) {
-  // Do nothing for fixed key decryption.
+  // Do nothing for fixed key encryption/decryption.
+  return Status::OK;
+}
+
+Status KeySource::FetchKeys(uint32_t asset_id) {
+  // Do nothing for fixed key encryption/decryption.
   return Status::OK;
 }
 

packager/media/base/key_source.h

@@ -51,6 +51,12 @@ class KeySource {
   /// @return OK on success, an error status otherwise.
   virtual Status FetchKeys(const std::vector<uint8_t>& pssh_data);
 
+  /// Fetch keys for WVM decryption from the key server.
+  /// @param asset_id is the Widevine Classic asset ID for the content to be
+  /// decrypted.
+  /// @return OK on success, an error status otherwise.
+  virtual Status FetchKeys(uint32_t asset_id) OVERRIDE;
+
   /// Get encryption key of the specified track type.
   /// @param track_type is the type of track for which retrieving the key.
   /// @param key is a pointer to the EncryptionKey which will hold the retrieved

packager/media/base/widevine_key_source.h

@@ -37,7 +37,7 @@ class WidevineKeySource : public KeySource {
   virtual Status FetchKeys(const std::vector<uint8_t>& content_id,
                            const std::string& policy) OVERRIDE;
   virtual Status FetchKeys(const std::vector<uint8_t>& pssh_data) OVERRIDE;
-  virtual Status FetchKeys(uint32_t asset_id);
+  virtual Status FetchKeys(uint32_t asset_id) OVERRIDE;
 
   virtual Status GetKey(TrackType track_type, EncryptionKey* key) OVERRIDE;
   virtual Status GetKey(const std::vector<uint8_t>& key_id,

packager/media/formats/wvm/wvm_media_parser.cc

@@ -10,10 +10,10 @@
 
 #include "packager/base/strings/string_number_conversions.h"
 #include "packager/media/base/audio_stream_info.h"
+#include "packager/media/base/key_source.h"
 #include "packager/media/base/media_sample.h"
 #include "packager/media/base/status.h"
 #include "packager/media/base/video_stream_info.h"
-#include "packager/media/base/widevine_key_source.h"
 #include "packager/media/formats/mp2t/adts_header.h"
 
 #define HAS_HEADER_EXTENSION(x) ((x != 0xBC) && (x != 0xBE) && (x != 0xBF) \
@@ -110,9 +110,7 @@ void WvmMediaParser::Init(const InitCB& init_cb,
   DCHECK(!is_initialized_);
   DCHECK(!init_cb.is_null());
   DCHECK(!new_sample_cb.is_null());
-  DCHECK(decryption_key_source);
-  decryption_key_source_ =
-      reinterpret_cast<WidevineKeySource*>(decryption_key_source);
+  decryption_key_source_ = decryption_key_source;
   init_cb_ = init_cb;
   new_sample_cb_ = new_sample_cb;
 }
@@ -756,8 +754,11 @@ bool WvmMediaParser::Output() {
   if ((prev_pes_stream_id_ & kPesStreamIdVideoMask) == kPesStreamIdVideo) {
     // Set data on the video stream from the NalUnitStream.
     std::vector<uint8_t> nal_unit_stream;
-    byte_to_unit_stream_converter_.ConvertByteStreamToNalUnitStream(
-        &sample_data_[0], sample_data_.size(), &nal_unit_stream);
+    if (!byte_to_unit_stream_converter_.ConvertByteStreamToNalUnitStream(
+            &sample_data_[0], sample_data_.size(), &nal_unit_stream)) {
+      LOG(ERROR) << "Could not convert h.264 byte stream sample";
+      return false;
+    }
     media_sample_->set_data(nal_unit_stream.data(), nal_unit_stream.size());
     if (!is_initialized_) {
       // Set extra data for video stream from AVC Decoder Config Record.
@@ -783,32 +784,34 @@ bool WvmMediaParser::Output() {
     media::mp2t::AdtsHeader adts_header;
     const uint8_t* frame_ptr = &sample_data_[0];
     std::vector<uint8_t> extra_data;
-      if (adts_header.Parse(frame_ptr, frame_size) &&
-         (adts_header.GetAudioSpecificConfig(&extra_data))) {
+    if (!adts_header.Parse(frame_ptr, frame_size) ||
+        !adts_header.GetAudioSpecificConfig(&extra_data)) {
+      LOG(ERROR) << "Could not parse ADTS header";
+      return false;
+    }
     size_t header_size = adts_header.GetAdtsHeaderSize(frame_ptr,
                                                        frame_size);
     media_sample_->set_data(frame_ptr + header_size,
                             frame_size - header_size);
     if (!is_initialized_) {
-          uint32_t sampling_frequency = adts_header.GetSamplingFrequency();
       for (uint32_t i = 0; i < stream_infos_.size(); i++) {
+        if (stream_infos_[i]->stream_type() == media::kStreamAudio &&
+            stream_infos_[i]->extra_data().empty()) {
+          // Set AudioStreamInfo fields using information from the ADTS
+          // header.
           AudioStreamInfo* audio_stream_info =
               reinterpret_cast<AudioStreamInfo*>(
                   stream_infos_[i].get());
-            audio_stream_info->set_sampling_frequency(sampling_frequency);
-            // Set extra data and codec string on the audio stream from the
-            // AdtsHeader.
-            if (stream_infos_[i]->stream_type() == media::kStreamAudio &&
-                stream_infos_[i]->extra_data().empty()) {
-              stream_infos_[i]->set_extra_data(extra_data);
-              stream_infos_[i]->set_codec_string(
+          audio_stream_info->set_sampling_frequency(
+              adts_header.GetSamplingFrequency());
+          audio_stream_info->set_extra_data(extra_data);
+          audio_stream_info->set_codec_string(
               AudioStreamInfo::GetCodecString(
                   kCodecAAC, adts_header.GetObjectType()));
         }
       }
     }
   }
-    }
 
   if (!is_initialized_) {
     bool is_extra_data_in_stream_infos = true;
@@ -908,6 +911,10 @@ void WvmMediaParser::EmitSample(uint32_t parsed_audio_or_video_stream_id,
 
 bool WvmMediaParser::GetAssetKey(const uint32_t asset_id,
                                  EncryptionKey* encryption_key) {
+  if (decryption_key_source_ == NULL) {
+    LOG(ERROR) << "Source content is encrypted, but decryption not enabled";
+    return false;
+  }
   Status status = decryption_key_source_->FetchKeys(asset_id);
   if (!status.ok()) {
     LOG(ERROR) << "Fetch Key(s) failed for AssetID = " << asset_id

packager/media/formats/wvm/wvm_media_parser.h

@@ -20,8 +20,8 @@
 namespace edash_packager {
 namespace media {
 
+class KeySource;
 struct EncryptionKey;
-class WidevineKeySource;
 
 namespace wvm {
 
@@ -247,7 +247,7 @@ class WvmMediaParser : public MediaParser {
   std::vector<scoped_refptr<StreamInfo> > stream_infos_;
   std::deque<DemuxStreamIdMediaSample> media_sample_queue_;
   std::vector<uint8_t> sample_data_;
-  WidevineKeySource* decryption_key_source_;
+  KeySource* decryption_key_source_;
   AesCbcCtsDecryptor content_decryptor_;
 
   DISALLOW_COPY_AND_ASSIGN(WvmMediaParser);