Initial CL for the timed text support:

- Add support for MP4 timed text
- Add API for app to turn on/off a text track
- Add timed text metadata(language) in the MediaMetadataRetriever

Change-Id: I0055beba38ac761627dbcc6d581ae9582d68bb94

1 files changed, 14 insertions, 0 deletions

diff --git a/media/libstagefright/StagefrightMetadataRetriever.cpp b/media/libstagefright/StagefrightMetadataRetriever.cpp
index 7621f2c..4c3dc47 100644
--- a/media/libstagefright/StagefrightMetadataRetriever.cpp
+++ b/media/libstagefright/StagefrightMetadataRetriever.cpp
@@ -27,6 +27,7 @@
 #include <media/stagefright/MediaExtractor.h>
 #include <media/stagefright/MetaData.h>
 #include <media/stagefright/OMXCodec.h>
+#include <media/stagefright/MediaDefs.h>
 
 namespace android {
 
@@ -429,6 +430,7 @@ void StagefrightMetadataRetriever::parseMetaData() {
 
     // The overall duration is the duration of the longest track.
     int64_t maxDurationUs = 0;
+    String8 timedTextLang;
     for (size_t i = 0; i < numTracks; ++i) {
         sp<MetaData> trackMeta = mExtractor->getTrackMetaData(i);
 
@@ -452,10 +454,22 @@ void StagefrightMetadataRetriever::parseMetaData() {
 
                 CHECK(trackMeta->findInt32(kKeyWidth, &videoWidth));
                 CHECK(trackMeta->findInt32(kKeyHeight, &videoHeight));
+            } else if (!strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP)) {
+                const char *lang;
+                trackMeta->findCString(kKeyMediaLanguage, &lang);
+                timedTextLang.append(String8(lang));
+                timedTextLang.append(String8(":"));
             }
         }
     }
 
+    // To save the language codes for all timed text tracks
+    // If multiple text tracks present, the format will look
+    // like "eng:chi"
+    if (!timedTextLang.isEmpty()) {
+        mMetaData.add(METADATA_KEY_TIMED_TEXT_LANGUAGES, timedTextLang);
+    }
+
     // The duration value is a string representing the duration in ms.
     sprintf(tmp, "%lld", (maxDurationUs + 500) / 1000);
     mMetaData.add(METADATA_KEY_DURATION, String8(tmp));