[Ad Insertion] Support one file per Representation per Period

Allow the output file to contain template identifiers like $Number$,
$Time$ etc. Unlike the actual template used in SegmentTemplate, the
identifiers in output will be populated before pushing to the DASH
manifest.

Issue: #384

Change-Id: Ife1caadb6fccd32167fa1bc83fe2afcb2d2ad087

packager/app/test/packager_test.py

@@ -151,6 +151,7 @@ class PackagerAppTest(unittest.TestCase):
                  drm_label=None,
                  skip_encryption=None,
                  bandwidth=None,
+                 split_content_on_ad_cues=False,
                  test_file=None):
     """Get a stream descriptor as a string.
 
@@ -174,6 +175,8 @@ class PackagerAppTest(unittest.TestCase):
       skip_encryption: If set to true, the stream will not be encrypted.
       bandwidth: The expected bandwidth value that should be listed in the
           manifest.
+      split_content_on_ad_cues: If set to true, the output file will be split
+          into multiple files, with a total of NumAdCues + 1 files.
       test_file: Specify the input file to use. If the input file is not
           specify, a default file will be used.
 
@@ -238,7 +241,10 @@ class PackagerAppTest(unittest.TestCase):
       seg_template = '%s-$Number$.%s' % (output_file_path, segment_ext)
       stream.Append('segment_template', seg_template)
     else:
-      output_file_path += '.' +  base_ext
+      if split_content_on_ad_cues:
+        output_file_path += '$Number$.' +  base_ext
+      else:
+        output_file_path += '.' +  base_ext
       stream.Append('output', output_file_path)
 
     if bandwidth:
@@ -1016,6 +1022,14 @@ class PackagerFunctionalTest(PackagerAppTest):
     self._VerifyDecryption(self.output[0], 'bear-640x360-a-demuxed-golden.mp4')
     self._VerifyDecryption(self.output[1], 'bear-640x360-v-golden.mp4')
 
+  def testEncryptionAndAdCuesSplitContent(self):
+    self.assertPackageSuccess(
+        self._GetStreams(
+            ['audio', 'video'], hls=True, split_content_on_ad_cues=True),
+        self._GetFlags(
+            encryption=True, output_dash=True, output_hls=True, ad_cues='1.5'))
+    self._CheckTestResults('encryption-and-ad-cues-split-content')
+
   def testHlsAudioVideoTextWithAdCues(self):
     streams = [
         self._GetStream('audio',

packager/app/test/testdata/encryption-and-ad-cues-split-content/bear-640x360-audio.m3u8

@@ -0,0 +1,22 @@
+#EXTM3U
+#EXT-X-VERSION:6
+## Generated with https://github.com/google/shaka-packager version <tag>-<hash>-<test>
+#EXT-X-TARGETDURATION:2
+#EXT-X-PLAYLIST-TYPE:VOD
+#EXT-X-MAP:URI="bear-640x360-audio1.mp4",BYTERANGE="967@0"
+#EXT-X-KEY:METHOD=SAMPLE-AES-CTR,URI="data:text/plain;base64,MTIzNDU2Nzg5MDEyMzQ1Ng==",KEYFORMAT="identity"
+#EXTINF:1.022,
+#EXT-X-BYTERANGE:16655@1035
+bear-640x360-audio1.mp4
+#EXTINF:0.998,
+#EXT-X-BYTERANGE:16650
+bear-640x360-audio1.mp4
+#EXTINF:0.046,
+#EXT-X-BYTERANGE:1014
+bear-640x360-audio1.mp4
+#EXT-X-PLACEMENT-OPPORTUNITY
+#EXT-X-KEY:METHOD=SAMPLE-AES-CTR,URI="data:text/plain;base64,MTIzNDU2Nzg5MDEyMzQ1Ng==",KEYFORMAT="identity"
+#EXTINF:0.697,
+#EXT-X-BYTERANGE:9415@1011
+bear-640x360-audio2.mp4
+#EXT-X-ENDLIST

packager/app/test/testdata/encryption-and-ad-cues-split-content/bear-640x360-video-iframe.m3u8

@@ -0,0 +1,20 @@
+#EXTM3U
+#EXT-X-VERSION:6
+## Generated with https://github.com/google/shaka-packager version <tag>-<hash>-<test>
+#EXT-X-TARGETDURATION:2
+#EXT-X-PLAYLIST-TYPE:VOD
+#EXT-X-I-FRAMES-ONLY
+#EXT-X-MAP:URI="bear-640x360-video1.mp4",BYTERANGE="1091@0"
+#EXT-X-KEY:METHOD=SAMPLE-AES-CTR,URI="data:text/plain;base64,MTIzNDU2Nzg5MDEyMzQ1Ng==",KEYFORMAT="identity"
+#EXTINF:1.001,
+#EXT-X-BYTERANGE:15581@1147
+bear-640x360-video1.mp4
+#EXTINF:1.001,
+#EXT-X-BYTERANGE:18754@100460
+bear-640x360-video1.mp4
+#EXT-X-PLACEMENT-OPPORTUNITY
+#EXT-X-KEY:METHOD=SAMPLE-AES-CTR,URI="data:text/plain;base64,MTIzNDU2Nzg5MDEyMzQ1Ng==",KEYFORMAT="identity"
+#EXTINF:0.734,
+#EXT-X-BYTERANGE:20068@1135
+bear-640x360-video2.mp4
+#EXT-X-ENDLIST

packager/app/test/testdata/encryption-and-ad-cues-split-content/bear-640x360-video.m3u8

@@ -0,0 +1,19 @@
+#EXTM3U
+#EXT-X-VERSION:6
+## Generated with https://github.com/google/shaka-packager version <tag>-<hash>-<test>
+#EXT-X-TARGETDURATION:2
+#EXT-X-PLAYLIST-TYPE:VOD
+#EXT-X-MAP:URI="bear-640x360-video1.mp4",BYTERANGE="1091@0"
+#EXT-X-KEY:METHOD=SAMPLE-AES-CTR,URI="data:text/plain;base64,MTIzNDU2Nzg5MDEyMzQ1Ng==",KEYFORMAT="identity"
+#EXTINF:1.068,
+#EXT-X-BYTERANGE:99313@1147
+bear-640x360-video1.mp4
+#EXTINF:1.001,
+#EXT-X-BYTERANGE:122340
+bear-640x360-video1.mp4
+#EXT-X-PLACEMENT-OPPORTUNITY
+#EXT-X-KEY:METHOD=SAMPLE-AES-CTR,URI="data:text/plain;base64,MTIzNDU2Nzg5MDEyMzQ1Ng==",KEYFORMAT="identity"
+#EXTINF:0.801,
+#EXT-X-BYTERANGE:80067@1135
+bear-640x360-video2.mp4
+#EXT-X-ENDLIST

packager/app/test/testdata/encryption-and-ad-cues-split-content/output.m3u8

@@ -0,0 +1,9 @@
+#EXTM3U
+## Generated with https://github.com/google/shaka-packager version <tag>-<hash>-<test>
+
+#EXT-X-MEDIA:TYPE=AUDIO,URI="bear-640x360-audio.m3u8",GROUP-ID="default-audio-group",NAME="stream_0",AUTOSELECT=YES,CHANNELS="2"
+
+#EXT-X-STREAM-INF:BANDWIDTH=1152419,CODECS="avc1.64001e,mp4a.40.2",RESOLUTION=640x360,AUDIO="default-audio-group"
+bear-640x360-video.m3u8
+
+#EXT-X-I-FRAME-STREAM-INF:BANDWIDTH=218704,CODECS="avc1.64001e",RESOLUTION=640x360,URI="bear-640x360-video-iframe.m3u8"

packager/app/test/testdata/encryption-and-ad-cues-split-content/output.mpd

@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--Generated with https://github.com/google/shaka-packager version <tag>-<hash>-<test>-->
+<MPD xmlns="urn:mpeg:dash:schema:mpd:2011" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="urn:mpeg:dash:schema:mpd:2011 DASH-MPD.xsd" xmlns:cenc="urn:mpeg:cenc:2013" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011" minBufferTime="PT2S" type="static" mediaPresentationDuration="PT2.8695333003997803S">
+  <Period id="0" duration="PT2.0687333333333333S">
+    <AdaptationSet id="0" contentType="video" width="640" height="360" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
+      <ContentProtection value="cenc" schemeIdUri="urn:mpeg:dash:mp4protection:2011" cenc:default_KID="31323334-3536-3738-3930-313233343536"/>
+      <ContentProtection schemeIdUri="urn:uuid:1077efec-c0b2-4d02-ace3-3c1e52e2fb4b">
+        <cenc:pssh>AAAANHBzc2gBAAAAEHfv7MCyTQKs4zweUuL7SwAAAAExMjM0NTY3ODkwMTIzNDU2AAAAAA==</cenc:pssh>
+      </ContentProtection>
+      <Representation id="0" bandwidth="977743" codecs="avc1.64001e" mimeType="video/mp4" sar="1:1">
+        <BaseURL>bear-640x360-video1.mp4</BaseURL>
+        <SegmentBase indexRange="1091-1146" timescale="30000">
+          <Initialization range="0-1090"/>
+        </SegmentBase>
+      </Representation>
+    </AdaptationSet>
+    <AdaptationSet id="1" contentType="audio" subsegmentAlignment="true">
+      <ContentProtection value="cenc" schemeIdUri="urn:mpeg:dash:mp4protection:2011" cenc:default_KID="31323334-3536-3738-3930-313233343536"/>
+      <ContentProtection schemeIdUri="urn:uuid:1077efec-c0b2-4d02-ace3-3c1e52e2fb4b">
+        <cenc:pssh>AAAANHBzc2gBAAAAEHfv7MCyTQKs4zweUuL7SwAAAAExMjM0NTY3ODkwMTIzNDU2AAAAAA==</cenc:pssh>
+      </ContentProtection>
+      <Representation id="1" bandwidth="174678" codecs="mp4a.40.2" mimeType="audio/mp4" audioSamplingRate="44100">
+        <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
+        <BaseURL>bear-640x360-audio1.mp4</BaseURL>
+        <SegmentBase indexRange="967-1034" timescale="44100">
+          <Initialization range="0-966"/>
+        </SegmentBase>
+      </Representation>
+    </AdaptationSet>
+  </Period>
+  <Period id="1" duration="PT.8008000000000002S">
+    <AdaptationSet id="0" contentType="video" width="640" height="360" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
+      <ContentProtection value="cenc" schemeIdUri="urn:mpeg:dash:mp4protection:2011" cenc:default_KID="31323334-3536-3738-3930-313233343536"/>
+      <ContentProtection schemeIdUri="urn:uuid:1077efec-c0b2-4d02-ace3-3c1e52e2fb4b">
+        <cenc:pssh>AAAANHBzc2gBAAAAEHfv7MCyTQKs4zweUuL7SwAAAAExMjM0NTY3ODkwMTIzNDU2AAAAAA==</cenc:pssh>
+      </ContentProtection>
+      <Representation id="0" bandwidth="799871" codecs="avc1.64001e" mimeType="video/mp4" sar="1:1">
+        <BaseURL>bear-640x360-video2.mp4</BaseURL>
+        <SegmentBase indexRange="1091-1134" timescale="30000" presentationTimeOffset="60059">
+          <Initialization range="0-1090"/>
+        </SegmentBase>
+      </Representation>
+    </AdaptationSet>
+    <AdaptationSet id="1" contentType="audio" subsegmentAlignment="true">
+      <ContentProtection value="cenc" schemeIdUri="urn:mpeg:dash:mp4protection:2011" cenc:default_KID="31323334-3536-3738-3930-313233343536"/>
+      <ContentProtection schemeIdUri="urn:uuid:1077efec-c0b2-4d02-ace3-3c1e52e2fb4b">
+        <cenc:pssh>AAAANHBzc2gBAAAAEHfv7MCyTQKs4zweUuL7SwAAAAExMjM0NTY3ODkwMTIzNDU2AAAAAA==</cenc:pssh>
+      </ContentProtection>
+      <Representation id="1" bandwidth="108126" codecs="mp4a.40.2" mimeType="audio/mp4" audioSamplingRate="44100">
+        <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
+        <BaseURL>bear-640x360-audio2.mp4</BaseURL>
+        <SegmentBase indexRange="967-1010" timescale="44100" presentationTimeOffset="88288">
+          <Initialization range="0-966"/>
+        </SegmentBase>
+      </Representation>
+    </AdaptationSet>
+  </Period>
+</MPD>

packager/media/base/muxer.cc

@@ -9,15 +9,22 @@
 #include <algorithm>
 
 #include "packager/media/base/media_sample.h"
+#include "packager/media/base/muxer_util.h"
+#include "packager/status_macros.h"
 
 namespace shaka {
 namespace media {
 namespace {
 const bool kInitialEncryptionInfo = true;
+const int64_t kStartTime = 0;
 }  // namespace
 
-Muxer::Muxer(const MuxerOptions& options)
-    : options_(options), cancelled_(false), clock_(NULL) {}
+Muxer::Muxer(const MuxerOptions& options) : options_(options) {
+  // "$" is only allowed if the output file name is a template, which is used to
+  // support one file per Representation per Period when there are Ad Cues.
+  if (options_.output_file_name.find("$") != std::string::npos)
+    output_file_template_ = options_.output_file_name;
+}
 
 Muxer::~Muxer() {}
 
@@ -39,16 +46,7 @@ Status Muxer::Process(std::unique_ptr<StreamData> stream_data) {
   switch (stream_data->stream_data_type) {
     case StreamDataType::kStreamInfo:
       streams_.push_back(std::move(stream_data->stream_info));
-      if (muxer_listener_ && streams_.back()->is_encrypted()) {
-        const EncryptionConfig& encryption_config =
-            streams_.back()->encryption_config();
-        muxer_listener_->OnEncryptionInfoReady(
-            kInitialEncryptionInfo, encryption_config.protection_scheme,
-            encryption_config.key_id, encryption_config.constant_iv,
-            encryption_config.key_system_info);
-        current_key_id_ = encryption_config.key_id;
-      }
-      return InitializeMuxer();
+      return ReinitializeMuxer(kStartTime);
     case StreamDataType::kSegmentInfo: {
       const auto& segment_info = *stream_data->segment_info;
       if (muxer_listener_ && segment_info.is_encrypted) {
@@ -80,6 +78,12 @@ Status Muxer::Process(std::unique_ptr<StreamData> stream_data) {
             static_cast<int64_t>(time_in_seconds * time_scale);
         muxer_listener_->OnCueEvent(scaled_time,
                                     stream_data->cue_event->cue_data);
+
+        // Finalize and re-initialize Muxer to generate different content files.
+        if (!output_file_template_.empty()) {
+          RETURN_IF_ERROR(Finalize());
+          RETURN_IF_ERROR(ReinitializeMuxer(scaled_time));
+        }
       }
       break;
     default:
@@ -91,5 +95,29 @@ Status Muxer::Process(std::unique_ptr<StreamData> stream_data) {
   return Status::OK;
 }
 
+Status Muxer::OnFlushRequest(size_t input_stream_index) {
+  return Finalize();
+}
+
+Status Muxer::ReinitializeMuxer(int64_t timestamp) {
+  if (muxer_listener_ && streams_.back()->is_encrypted()) {
+    const EncryptionConfig& encryption_config =
+        streams_.back()->encryption_config();
+    muxer_listener_->OnEncryptionInfoReady(
+        kInitialEncryptionInfo, encryption_config.protection_scheme,
+        encryption_config.key_id, encryption_config.constant_iv,
+        encryption_config.key_system_info);
+    current_key_id_ = encryption_config.key_id;
+  }
+  if (!output_file_template_.empty()) {
+    // Update |output_file_name| with an actual file name, which will be used by
+    // the subclasses.
+    options_.output_file_name =
+        GetSegmentName(output_file_template_, timestamp, output_file_index_++,
+                       options_.bandwidth);
+  }
+  return InitializeMuxer();
+}
+
 }  // namespace media
 }  // namespace shaka

packager/media/base/muxer.h

@@ -63,7 +63,7 @@ class Muxer : public MediaHandler {
   /// @{
   Status InitializeInternal() override { return Status::OK; }
   Status Process(std::unique_ptr<StreamData> stream_data) override;
-  Status OnFlushRequest(size_t input_stream_index) override { return Finalize(); }
+  Status OnFlushRequest(size_t input_stream_index) override;
   /// @}
 
   const MuxerOptions& options() const { return options_; }
@@ -72,6 +72,13 @@ class Muxer : public MediaHandler {
   base::Clock* clock() { return clock_; }
 
  private:
+  Muxer(const Muxer&) = delete;
+  Muxer& operator=(const Muxer&) = delete;
+
+  // Re-initialize Muxer. Could be called on StreamInfo or CueEvent.
+  // |timestamp| may be used to set the output file name.
+  Status ReinitializeMuxer(int64_t timestamp);
+
   // Initialize the muxer.
   virtual Status InitializeMuxer() = 0;
 
@@ -92,14 +99,17 @@ class Muxer : public MediaHandler {
   std::vector<std::shared_ptr<const StreamInfo>> streams_;
   std::vector<uint8_t> current_key_id_;
   bool encryption_started_ = false;
-  bool cancelled_;
+  bool cancelled_ = false;
 
   std::unique_ptr<MuxerListener> muxer_listener_;
   std::unique_ptr<ProgressListener> progress_listener_;
   // An external injected clock, can be NULL.
-  base::Clock* clock_;
+  base::Clock* clock_ = nullptr;
 
-  DISALLOW_COPY_AND_ASSIGN(Muxer);
+  // In VOD single segment case with Ad Cues, |output_file_name| is allowed to
+  // be a template. In this case, there will be NumAdCues + 1 files generated.
+  std::string output_file_template_;
+  size_t output_file_index_ = 0;
 };
 
 }  // namespace media

packager/media/event/muxer_listener_internal.cc

@@ -160,6 +160,26 @@ void SetMediaInfoMuxerOptions(const MuxerOptions& muxer_options,
   }
 }
 
+// Adjust MediaInfo for compatibility comparison. MediaInfos are considered to
+// be compatible if codec and container are the same.
+MediaInfo GetCompatibleComparisonMediaInfo(const MediaInfo& media_info) {
+  MediaInfo adjusted_media_info;
+  adjusted_media_info.set_reference_time_scale(
+      media_info.reference_time_scale());
+  adjusted_media_info.set_container_type(media_info.container_type());
+  if (media_info.has_video_info()) {
+    *adjusted_media_info.mutable_video_info() = media_info.video_info();
+    adjusted_media_info.mutable_video_info()->clear_frame_duration();
+  }
+  if (media_info.has_audio_info()) {
+    *adjusted_media_info.mutable_audio_info() = media_info.audio_info();
+  }
+  if (media_info.has_text_info()) {
+    *adjusted_media_info.mutable_text_info() = media_info.text_info();
+  }
+  return adjusted_media_info;
+}
+
 }  // namespace
 
 bool GenerateMediaInfo(const MuxerOptions& muxer_options,
@@ -181,15 +201,9 @@ bool GenerateMediaInfo(const MuxerOptions& muxer_options,
 
 bool IsMediaInfoCompatible(const MediaInfo& media_info1,
                            const MediaInfo& media_info2) {
-  return media_info1.reference_time_scale() ==
-             media_info2.reference_time_scale() &&
-         media_info1.container_type() == media_info2.container_type() &&
-         MessageDifferencer::Equals(media_info1.video_info(),
-                                    media_info2.video_info()) &&
-         MessageDifferencer::Equals(media_info1.audio_info(),
-                                    media_info2.audio_info()) &&
-         MessageDifferencer::Equals(media_info1.text_info(),
-                                    media_info2.text_info());
+  return MessageDifferencer::Equals(
+      GetCompatibleComparisonMediaInfo(media_info1),
+      GetCompatibleComparisonMediaInfo(media_info2));
 }
 
 bool SetVodInformation(const MuxerListener::MediaRanges& media_ranges,

packager/packager.cc

@@ -219,6 +219,13 @@ Status ValidateStreamDescriptor(bool dump_stream_info,
     }
   }
 
+  if (stream.output.find('$') != std::string::npos) {
+    // "$" is only allowed if the output file name is a template, which is
+    // used to support one file per Representation per Period when there are
+    // Ad Cues.
+    RETURN_IF_ERROR(ValidateSegmentTemplate(stream.output));
+  }
+
   // There are some specifics that must be checked based on which format
   // we are writing to.
   const MediaContainerName output_format = GetOutputFormat(stream);