commit 728e08bc3fd99dc64f436270f53c22f3457204a8
author Eino-Ville Talvala <etalvala@google.com> Mon Aug 29 18:16:03 2011 -0700
committer Eino-Ville Talvala <etalvala@google.com> Tue Aug 30 10:49:15 2011 -0700
tree 6e0efa9d9432a616777db0c3ddd7c06e646d706e
parent 2db44c5838fb0bb35092a19f31ee887892a451a1

Fix SurfaceMediaSource timestamp handling.

Was not basing timestamps on startTimeUs.
Now synchronizes properly with audio.

Bug: 4510826
Change-Id: I613db0aa91e51fc75d120e65540e742d8ab2ae43

include/media/stagefright/SurfaceMediaSource.h

diff --git a/include/media/stagefright/SurfaceMediaSource.h b/include/media/stagefright/SurfaceMediaSource.h
index 74d54d1..f7f0ed7 100644
--- a/include/media/stagefright/SurfaceMediaSource.h
+++ b/include/media/stagefright/SurfaceMediaSource.h
@@ -347,6 +347,13 @@
     // encoder
     int mNumFramesEncoded;
 
+    // mFirstFrameTimestamp is the timestamp of the first received frame.
+    // It is used to offset the output timestamps so recording starts at time 0.
+    int64_t mFirstFrameTimestamp;
+    // mStartTimeNs is the start time passed into the source at start, used to
+    // offset timestamps.
+    int64_t mStartTimeNs;
+
     // mFrameAvailableCondition condition used to indicate whether there
     // is a frame available for dequeuing
     Condition mFrameAvailableCondition;

media/libstagefright/SurfaceMediaSource.cpp

diff --git a/media/libstagefright/SurfaceMediaSource.cpp b/media/libstagefright/SurfaceMediaSource.cpp
index 91b81c2..50dd804 100644
--- a/media/libstagefright/SurfaceMediaSource.cpp
+++ b/media/libstagefright/SurfaceMediaSource.cpp
@@ -46,9 +46,10 @@
                 mSynchronousMode(true),
                 mConnectedApi(NO_CONNECTED_API),
                 mFrameRate(30),
+                mStopped(false),
                 mNumFramesReceived(0),
                 mNumFramesEncoded(0),
-                mStopped(false) {
+                mFirstFrameTimestamp(0) {
     LOGV("SurfaceMediaSource::SurfaceMediaSource");
     sp<ISurfaceComposer> composer(ComposerService::getComposerService());
     mGraphicBufferAlloc = composer->createGraphicBufferAlloc();
@@ -471,10 +472,25 @@
         return -EINVAL;
     }
 
+    if (mNumFramesReceived == 0) {
+        mFirstFrameTimestamp = timestamp;
+        // Initial delay
+        if (mStartTimeNs > 0) {
+            if (timestamp < mStartTimeNs) {
+                // This frame predates start of record, discard
+                mSlots[bufIndex].mBufferState = BufferSlot::FREE;
+                mDequeueCondition.signal();
+                return OK;
+            }
+            mStartTimeNs = timestamp - mStartTimeNs;
+        }
+    }
+    timestamp = mStartTimeNs + (timestamp - mFirstFrameTimestamp);
+
+    mNumFramesReceived++;
     if (mSynchronousMode) {
         // in synchronous mode we queue all buffers in a FIFO
         mQueue.push_back(bufIndex);
-        mNumFramesReceived++;
         LOGV("Client queued buf# %d @slot: %d, Q size = %d, handle = %p, timestamp = %lld",
             mNumFramesReceived, bufIndex, mQueue.size(),
             mSlots[bufIndex].mGraphicBuffer->handle, timestamp);
@@ -684,6 +700,13 @@
 status_t SurfaceMediaSource::start(MetaData *params)
 {
     LOGV("started!");
+
+    mStartTimeNs = 0;
+    int64_t startTimeUs;
+    if (params && params->findInt64(kKeyTime, &startTimeUs)) {
+        mStartTimeNs = startTimeUs * 1000;
+    }
+
     return OK;
 }
 
@@ -753,6 +776,7 @@
     mCurrentBuf = mSlots[mCurrentSlot].mGraphicBuffer;
     int64_t prevTimeStamp = mCurrentTimestamp;
     mCurrentTimestamp = mSlots[mCurrentSlot].mTimestamp;
+
     mNumFramesEncoded++;
     // Pass the data to the MediaBuffer. Pass in only the metadata
     passMetadataBufferLocked(buffer);