In order to recover from video lagging behind audio, drop avc frames

that are not referenced by other frames before feeding them into the decoder.

Change-Id: I822190af8f8329567bff8da1ea23136d0a765481

1 files changed, 22 insertions, 0 deletions

diff --git a/media/libstagefright/avc_utils.cpp b/media/libstagefright/avc_utils.cpp
index 8a42e8b..07aa140 100644
--- a/media/libstagefright/avc_utils.cpp
+++ b/media/libstagefright/avc_utils.cpp
@@ -329,6 +329,28 @@ bool IsIDR(const sp<ABuffer> &buffer) {
     return foundIDR;
 }
 
+bool IsAVCReferenceFrame(const sp<ABuffer> &accessUnit) {
+    const uint8_t *data = accessUnit->data();
+    size_t size = accessUnit->size();
+
+    const uint8_t *nalStart;
+    size_t nalSize;
+    while (getNextNALUnit(&data, &size, &nalStart, &nalSize, true) == OK) {
+        CHECK_GT(nalSize, 0u);
+
+        unsigned nalType = nalStart[0] & 0x1f;
+
+        if (nalType == 5) {
+            return true;
+        } else if (nalType == 1) {
+            unsigned nal_ref_idc = (nalStart[0] >> 5) & 3;
+            return nal_ref_idc != 0;
+        }
+    }
+
+    return true;
+}
+
 sp<MetaData> MakeAACCodecSpecificData(
         unsigned profile, unsigned sampling_freq_index,
         unsigned channel_configuration) {