Support 'iframe_playlist_name' stream descriptor

Issue: #287

Change-Id: I484761dfacadce05175d16c4c12454f0ed932579

docs/source/options/hls_stream_descriptors.rst

@@ -17,3 +17,10 @@ HLS specific stream descriptor fields
     relative to hls_master_playlist_output (see below). If unspecified,
     defaults to something of the form 'stream_0.m3u8', 'stream_1.m3u8',
     'stream_2.m3u8', etc.
+
+:iframe_playlist_name:
+
+    The optional HLS I-Frames only playlist file to create. Usually ends with
+    '.m3u8', and is relative to hls_master_playlist_output (see below). Should
+    only be set for video streams. If unspecified, no I-Frames only playlist is
+    created.

packager/app/packager_main.cc

@@ -100,7 +100,11 @@ const char kUsage[] =
     "  - playlist_name: The HLS playlist file to create. Usually ends with\n"
     "    '.m3u8', and is relative to --hls_master_playlist_output. If\n"
     "    unspecified, defaults to something of the form 'stream_0.m3u8',\n"
-    "    'stream_1.m3u8', 'stream_2.m3u8', etc.\n";
+    "    'stream_1.m3u8', 'stream_2.m3u8', etc.\n"
+    "  - iframe_playlist_name: The optional HLS I-Frames only playlist file\n"
+    "    to create. Usually ends with '.m3u8', and is relative to\n"
+    "    hls_master_playlist_output. Should only be set for video streams. If\n"
+    "    unspecified, no I-Frames only playlist is created.\n";
 
 // Labels for parameters in RawKey key info.
 const char kDrmLabelLabel[] = "label";

packager/app/stream_descriptor.cc

@@ -26,6 +26,7 @@ enum FieldType {
   kHlsNameField,
   kHlsGroupIdField,
   kHlsPlaylistNameField,
+  kHlsIframePlaylistNameField,
   kTrickPlayFactorField,
   kSkipEncryptionField,
   kDrmStreamLabelField,
@@ -56,6 +57,7 @@ const FieldNameToTypeMapping kFieldNameTypeMappings[] = {
     {"hls_name", kHlsNameField},
     {"hls_group_id", kHlsGroupIdField},
     {"playlist_name", kHlsPlaylistNameField},
+    {"iframe_playlist_name", kHlsIframePlaylistNameField},
     {"trick_play_factor", kTrickPlayFactorField},
     {"tpf", kTrickPlayFactorField},
     {"skip_encryption", kSkipEncryptionField},
@@ -128,6 +130,10 @@ base::Optional<StreamDescriptor> ParseStreamDescriptor(
         descriptor.hls_playlist_name = iter->second;
         break;
       }
+      case kHlsIframePlaylistNameField: {
+        descriptor.hls_iframe_playlist_name = iter->second;
+        break;
+      }
       case kTrickPlayFactorField: {
         unsigned factor;
         if (!base::StringToUint(iter->second, &factor)) {

packager/media/event/muxer_listener_factory.cc

@@ -37,7 +37,7 @@ std::unique_ptr<MuxerListener> CreateMpdListenerInternal(
   return listener;
 }
 
-std::unique_ptr<MuxerListener> CreateHlsListenerInternal(
+std::list<std::unique_ptr<MuxerListener>> CreateHlsListenersInternal(
     const MuxerListenerFactory::StreamData& stream,
     int stream_index,
     hls::HlsNotifier* notifier) {
@@ -47,6 +47,7 @@ std::unique_ptr<MuxerListener> CreateHlsListenerInternal(
   std::string group_id = stream.hls_group_id;
   std::string name = stream.hls_name;
   std::string hls_playlist_name = stream.hls_playlist_name;
+  std::string hls_iframe_playlist_name = stream.hls_iframe_playlist_name;
 
   if (name.empty()) {
     name = base::StringPrintf("stream_%d", stream_index);
@@ -57,9 +58,14 @@ std::unique_ptr<MuxerListener> CreateHlsListenerInternal(
   }
 
   const bool kIFramesOnly = true;
-  std::unique_ptr<MuxerListener> listener(new HlsNotifyMuxerListener(
+  std::list<std::unique_ptr<MuxerListener>> listeners;
+  listeners.emplace_back(new HlsNotifyMuxerListener(
       hls_playlist_name, !kIFramesOnly, name, group_id, notifier));
-  return listener;
+  if (!hls_iframe_playlist_name.empty()) {
+    listeners.emplace_back(new HlsNotifyMuxerListener(
+        hls_iframe_playlist_name, kIFramesOnly, name, group_id, notifier));
+  }
+  return listeners;
 }
 }  // namespace
 
@@ -85,8 +91,10 @@ std::unique_ptr<MuxerListener> MuxerListenerFactory::CreateListener(
     combined_listener->AddListener(CreateMpdListenerInternal(mpd_notifier_));
   }
   if (hls_notifier_) {
-    combined_listener->AddListener(
+    for (auto& listener :
-        CreateHlsListenerInternal(stream, stream_index, hls_notifier_));
+         CreateHlsListenersInternal(stream, stream_index, hls_notifier_)) {
+      combined_listener->AddListener(std::move(listener));
+    }
   }
 
   return std::move(combined_listener);
@@ -99,7 +107,8 @@ std::unique_ptr<MuxerListener> MuxerListenerFactory::CreateHlsListener(
   }
 
   const int stream_index = stream_index_++;
-  return CreateHlsListenerInternal(stream, stream_index, hls_notifier_);
+  return std::move(
+      CreateHlsListenersInternal(stream, stream_index, hls_notifier_).front());
 }
 
 }  // namespace media

packager/media/event/muxer_listener_factory.h

@@ -43,6 +43,7 @@ class MuxerListenerFactory {
     std::string hls_group_id;
     std::string hls_name;
     std::string hls_playlist_name;
+    std::string hls_iframe_playlist_name;
   };
 
   /// Create a new muxer listener.

packager/packager.h

@@ -112,6 +112,9 @@ struct StreamDescriptor {
   /// Required for HLS output. It defines the name of the playlist for the
   /// stream. Usually ends with `.m3u8`.
   std::string hls_playlist_name;
+  /// Optional for HLS output. It defines the name of the I-Frames only playlist
+  /// for the stream. For Video only. Usually ends with `.m3u8`.
+  std::string hls_iframe_playlist_name;
 };
 
 class SHAKA_EXPORT Packager {