1 files changed, 5 insertions, 4 deletions
diff --git a/media/libstagefright/codecs/amrnb/enc/AMRNBEncoder.cpp b/media/libstagefright/codecs/amrnb/enc/AMRNBEncoder.cpp
index dab1390..858e6d0 100644
--- a/media/libstagefright/codecs/amrnb/enc/AMRNBEncoder.cpp
+++ b/media/libstagefright/codecs/amrnb/enc/AMRNBEncoder.cpp
@@ -148,7 +148,7 @@ status_t AMRNBEncoder::read(
     ReadOptions::SeekMode mode;
     CHECK(options == NULL || !options->getSeekTo(&seekTimeUs, &mode));
     bool readFromSource = false;
-    int64_t wallClockTimeUs = 0;
+    int64_t wallClockTimeUs = -1;
 
     while (mNumInputSamples < kNumSamplesPerFrame) {
         if (mInputBuffer == NULL) {
@@ -171,8 +171,9 @@ status_t AMRNBEncoder::read(
             readFromSource = true;
 
             int64_t timeUs;
-            CHECK(mInputBuffer->meta_data()->findInt64(kKeyDriftTime, &timeUs));
-            wallClockTimeUs = timeUs;
+            if (mInputBuffer->meta_data()->findInt64(kKeyDriftTime, &timeUs)) {
+                wallClockTimeUs = timeUs;
+            }
             if (mInputBuffer->meta_data()->findInt64(kKeyTime, &timeUs)) {
                 mAnchorTimeUs = timeUs;
             }
@@ -227,7 +228,7 @@ status_t AMRNBEncoder::read(
     buffer->meta_data()->setInt64(
             kKeyTime, mAnchorTimeUs + mediaTimeUs);
 
-    if (readFromSource) {
+    if (readFromSource && wallClockTimeUs != -1) {
         buffer->meta_data()->setInt64(kKeyDriftTime,
             mediaTimeUs - wallClockTimeUs);
     }