Make edash-packager outputs predictable for testing

- Added --iv to inject iv for fixed key encryption.
- Added support for key rotation in fixed key encryption.
- Added --use_fake_clock_for_muxer to set timestamp to 0 in the output.

Also updates stream info dump message:
- Modified pixel_width: %d\n pixel_height: %d to pixel aspect ratio: %d:%d
- Removed language from video stream info.

These flags should only be used for testing.

Change-Id: Iedf8d6d6492226219f49fe44d932645f557010e4

packager/app/fixed_key_encryption_flags.cc

@@ -18,6 +18,10 @@ DEFINE_bool(enable_fixed_key_decryption,
             "Enable decryption with fixed key.");
 DEFINE_string(key_id, "", "Key id in hex string format.");
 DEFINE_string(key, "", "Key in hex string format.");
+DEFINE_string(iv,
+              "",
+              "Iv in hex string format. If not specified, a random iv will be "
+              "generated. This flag should only be used for testing.");
 DEFINE_string(pssh, "", "PSSH in hex string format.");
 
 namespace edash_packager {
@@ -38,6 +42,10 @@ bool ValidateFixedCryptoFlags() {
           "key", FLAGS_key, fixed_crypto, false, fixed_crypto_label)) {
     success = false;
   }
+  if (!ValidateFlag("iv", FLAGS_iv, FLAGS_enable_fixed_key_encryption, true,
+                    "--enable_fixed_key_encryption")) {
+    success = false;
+  }
 
   // --pssh is associated with --enable_fix_key_encryption.
   if (!ValidateFlag("pssh",

packager/app/fixed_key_encryption_flags.h

@@ -15,6 +15,7 @@ DECLARE_bool(enable_fixed_key_encryption);
 DECLARE_bool(enable_fixed_key_decryption);
 DECLARE_string(key_id);
 DECLARE_string(key);
+DECLARE_string(iv);
 DECLARE_string(pssh);
 
 namespace edash_packager {

packager/app/packager_main.cc

@@ -4,6 +4,7 @@
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
+#include <gflags/gflags.h>
 #include <iostream>
 
 #include "packager/app/fixed_key_encryption_flags.h"
@@ -18,6 +19,7 @@
 #include "packager/base/strings/string_split.h"
 #include "packager/base/strings/stringprintf.h"
 #include "packager/base/threading/simple_thread.h"
+#include "packager/base/time/clock.h"
 #include "packager/media/base/demuxer.h"
 #include "packager/media/base/key_source.h"
 #include "packager/media/base/muxer_options.h"
@@ -29,6 +31,12 @@
 #include "packager/mpd/base/mpd_builder.h"
 #include "packager/mpd/base/simple_mpd_notifier.h"
 
+DEFINE_bool(use_fake_clock_for_muxer,
+            false,
+            "Set to true to use a fake clock for muxer. With this flag set, "
+            "creation time and modification time in outputs are set to 0. "
+            "Should only be used for testing.");
+
 namespace {
 const char kUsage[] =
     "Packager driver program. Sample Usage:\n"
@@ -66,6 +74,13 @@ enum ExitStatus {
 namespace edash_packager {
 namespace media {
 
+// A fake clock that always return time 0 (epoch). Should only be used for
+// testing.
+class FakeClock : public base::Clock {
+ public:
+  virtual base::Time Now() OVERRIDE { return base::Time(); }
+};
+
 // Demux, Mux(es) and worker thread used to remux a source file/stream.
 class RemuxJob : public base::SimpleThread {
  public:
@@ -99,6 +114,7 @@ class RemuxJob : public base::SimpleThread {
 
 bool CreateRemuxJobs(const StreamDescriptorList& stream_descriptors,
                      const MuxerOptions& muxer_options,
+                     FakeClock* fake_clock,
                      KeySource* key_source,
                      MpdNotifier* mpd_notifier,
                      std::vector<RemuxJob*>* remux_jobs) {
@@ -149,6 +165,8 @@ bool CreateRemuxJobs(const StreamDescriptorList& stream_descriptors,
     DCHECK(!remux_jobs->empty());
 
     scoped_ptr<Muxer> muxer(new mp4::MP4Muxer(stream_muxer_options));
+    if (FLAGS_use_fake_clock_for_muxer) muxer->set_clock(fake_clock);
+
     if (key_source) {
       muxer->SetKeySource(key_source,
                           FLAGS_max_sd_pixels,
@@ -274,10 +292,9 @@ bool RunPackager(const StreamDescriptorList& stream_descriptors) {
 
   std::vector<RemuxJob*> remux_jobs;
   STLElementDeleter<std::vector<RemuxJob*> > scoped_jobs_deleter(&remux_jobs);
-  if (!CreateRemuxJobs(stream_descriptors,
-                       muxer_options,
-                       encryption_key_source.get(),
-                       mpd_notifier.get(),
+  FakeClock fake_clock;
+  if (!CreateRemuxJobs(stream_descriptors, muxer_options, &fake_clock,
+                       encryption_key_source.get(), mpd_notifier.get(),
                        &remux_jobs)) {
     return false;
   }

packager/app/packager_util.cc

@@ -91,7 +91,7 @@ scoped_ptr<KeySource> CreateEncryptionKeySource() {
     encryption_key_source = widevine_key_source.Pass();
   } else if (FLAGS_enable_fixed_key_encryption) {
     encryption_key_source = KeySource::CreateFromHexStrings(
-        FLAGS_key_id, FLAGS_key, FLAGS_pssh, "");
+        FLAGS_key_id, FLAGS_key, FLAGS_pssh, FLAGS_iv);
   }
   return encryption_key_source.Pass();
 }

packager/app/widevine_encryption_flags.cc

@@ -142,12 +142,6 @@ bool ValidateWidevineCryptoFlags() {
   if (FLAGS_crypto_period_duration < 0) {
     PrintError("--crypto_period_duration should not be negative.");
     success = false;
-  } else if (FLAGS_crypto_period_duration > 0 &&
-             !FLAGS_enable_widevine_encryption) {
-    PrintError(
-        "--crypto_period_duration should be specified only if "
-        "--enable_widevine_encryption.");
-    success = false;
   }
   return success;
 }

packager/media/base/audio_stream_info.cc

@@ -90,12 +90,9 @@ bool AudioStreamInfo::IsValidConfig() const {
 std::string AudioStreamInfo::ToString() const {
   return base::StringPrintf(
       "%s codec: %s\n sample_bits: %d\n num_channels: %d\n "
-      "sampling_frequency: %d\n",
-      StreamInfo::ToString().c_str(),
-      AudioCodecToString(codec_).c_str(),
-      sample_bits_,
-      num_channels_,
-      sampling_frequency_);
+      "sampling_frequency: %d\n language: %s\n",
+      StreamInfo::ToString().c_str(), AudioCodecToString(codec_).c_str(),
+      sample_bits_, num_channels_, sampling_frequency_, language().c_str());
 }
 
 std::string AudioStreamInfo::GetCodecString(AudioCodec codec,

packager/media/base/key_source.cc

@@ -14,7 +14,8 @@ namespace {
 const uint8_t kWidevineSystemId[] = {0xed, 0xef, 0x8b, 0xa9, 0x79, 0xd6,
                                      0x4a, 0xce, 0xa3, 0xc8, 0x27, 0xdc,
                                      0xd5, 0x1d, 0x21, 0xed};
-const char kDefaultUUID[] = "";
+// TODO(kqyang): Consider making it configurable.
+const char kDefaultUUID[] = "edef8ba9-79d6-4ace-a3c8-27dcd51d21ed";
 const char kDefaultSystemName[] = "";
 }  // namespace
 
@@ -65,8 +66,27 @@ Status KeySource::GetKey(const std::vector<uint8_t>& key_id,
 Status KeySource::GetCryptoPeriodKey(uint32_t crypto_period_index,
                                      TrackType track_type,
                                      EncryptionKey* key) {
-  NOTIMPLEMENTED();
-  return Status(error::UNIMPLEMENTED, "");
+  *key = *encryption_key_;
+  // A naive key rotation algorithm is implemented here by left rotating the
+  // key, key_id and pssh. Note that this implementation is only intended for
+  // testing purpose. The actual key rotation algorithm can be much more
+  // complicated.
+  LOG(WARNING)
+      << "This naive key rotation algorithm should not be used in production.";
+  std::rotate(key->key_id.begin(),
+              key->key_id.begin() + (crypto_period_index % key->key_id.size()),
+              key->key_id.end());
+  std::rotate(key->key.begin(),
+              key->key.begin() + (crypto_period_index % key->key.size()),
+              key->key.end());
+  const size_t kPsshHeaderSize = 32u;
+  std::vector<uint8_t> pssh_data(key->pssh.begin() + kPsshHeaderSize,
+                                 key->pssh.end());
+  std::rotate(pssh_data.begin(),
+              pssh_data.begin() + (crypto_period_index % pssh_data.size()),
+              pssh_data.end());
+  key->pssh = PsshBoxFromPsshData(pssh_data);
+  return Status::OK;
 }
 
 std::string KeySource::UUID() {

packager/media/base/stream_info.cc

@@ -40,11 +40,11 @@ StreamInfo::~StreamInfo() {}
 std::string StreamInfo::ToString() const {
   return base::StringPrintf(
       "type: %s\n codec_string: %s\n time_scale: %d\n duration: "
-      "%" PRIu64 " (%.1f seconds)\n language: %s\n is_encrypted: %s\n",
+      "%" PRIu64 " (%.1f seconds)\n is_encrypted: %s\n",
       (stream_type_ == kStreamAudio ? "Audio" : "Video"),
       codec_string_.c_str(),
       time_scale_, duration_,
-      static_cast<double>(duration_) / time_scale_, language_.c_str(),
+      static_cast<double>(duration_) / time_scale_,
       is_encrypted_ ? "true" : "false");
 }
 

packager/media/base/video_stream_info.cc

@@ -85,13 +85,11 @@ bool VideoStreamInfo::IsValidConfig() const {
 
 std::string VideoStreamInfo::ToString() const {
   return base::StringPrintf(
-      "%s codec: %s\n width: %d\n height: %d\n pixel_width: %d\n pixel_height: "
-      "%d\n trick_play_rate: %d\n nalu_length_size: %d\n",
-      StreamInfo::ToString().c_str(),
-      VideoCodecToString(codec_).c_str(),
-      width_, height_,
-      pixel_width_, pixel_height_,
-      trick_play_rate_, nalu_length_size_);
+      "%s codec: %s\n width: %d\n height: %d\n pixel aspect ratio: %d:%d\n "
+      "trick_play_rate: %d\n nalu_length_size: %d\n",
+      StreamInfo::ToString().c_str(), VideoCodecToString(codec_).c_str(),
+      width_, height_, pixel_width_, pixel_height_, trick_play_rate_,
+      nalu_length_size_);
 }
 
 std::string VideoStreamInfo::GetCodecString(VideoCodec codec,