4 files changed, 97 insertions, 0 deletions

diff --git a/media/libstagefright/MPEG4Extractor.cpp b/media/libstagefright/MPEG4Extractor.cpp
index e6e98aa..108a1d1 100644
--- a/media/libstagefright/MPEG4Extractor.cpp
+++ b/media/libstagefright/MPEG4Extractor.cpp
@@ -1074,6 +1074,20 @@ status_t MPEG4Extractor::parseChunk(off64_t *offset, int depth) {
             break;
         }
 
+        case FOURCC('c', 't', 't', 's'):
+        {
+            status_t err =
+                mLastTrack->sampleTable->setCompositionTimeToSampleParams(
+                        data_offset, chunk_data_size);
+
+            if (err != OK) {
+                return err;
+            }
+
+            *offset += chunk_size;
+            break;
+        }
+
         case FOURCC('s', 't', 's', 's'):
         {
             status_t err =
diff --git a/media/libstagefright/SampleIterator.cpp b/media/libstagefright/SampleIterator.cpp
index 062ab9b..c7b00b1 100644
--- a/media/libstagefright/SampleIterator.cpp
+++ b/media/libstagefright/SampleIterator.cpp
@@ -307,6 +307,8 @@ status_t SampleIterator::findSampleTime(
 
     *time = mTTSSampleTime + mTTSDuration * (sampleIndex - mTTSSampleIndex);
 
+    *time += mTable->getCompositionTimeOffset(sampleIndex);
+
     return OK;
 }
 
diff --git a/media/libstagefright/SampleTable.cpp b/media/libstagefright/SampleTable.cpp
index a9163fc..423df70 100644
--- a/media/libstagefright/SampleTable.cpp
+++ b/media/libstagefright/SampleTable.cpp
@@ -53,6 +53,8 @@ SampleTable::SampleTable(const sp<DataSource> &source)
       mNumSampleSizes(0),
       mTimeToSampleCount(0),
       mTimeToSample(NULL),
+      mCompositionTimeDeltaEntries(NULL),
+      mNumCompositionTimeDeltaEntries(0),
       mSyncSampleOffset(-1),
       mNumSyncSamples(0),
       mSyncSamples(NULL),
@@ -68,6 +70,9 @@ SampleTable::~SampleTable() {
     delete[] mSyncSamples;
     mSyncSamples = NULL;
 
+    delete[] mCompositionTimeDeltaEntries;
+    mCompositionTimeDeltaEntries = NULL;
+
     delete[] mTimeToSample;
     mTimeToSample = NULL;
 
@@ -260,6 +265,51 @@ status_t SampleTable::setTimeToSampleParams(
     return OK;
 }
 
+status_t SampleTable::setCompositionTimeToSampleParams(
+        off64_t data_offset, size_t data_size) {
+    LOGI("There are reordered frames present.");
+
+    if (mCompositionTimeDeltaEntries != NULL || data_size < 8) {
+        return ERROR_MALFORMED;
+    }
+
+    uint8_t header[8];
+    if (mDataSource->readAt(
+                data_offset, header, sizeof(header))
+            < (ssize_t)sizeof(header)) {
+        return ERROR_IO;
+    }
+
+    if (U32_AT(header) != 0) {
+        // Expected version = 0, flags = 0.
+        return ERROR_MALFORMED;
+    }
+
+    size_t numEntries = U32_AT(&header[4]);
+
+    if (data_size != (numEntries + 1) * 8) {
+        return ERROR_MALFORMED;
+    }
+
+    mNumCompositionTimeDeltaEntries = numEntries;
+    mCompositionTimeDeltaEntries = new uint32_t[2 * numEntries];
+
+    if (mDataSource->readAt(
+                data_offset + 8, mCompositionTimeDeltaEntries, numEntries * 8)
+            < (ssize_t)numEntries * 8) {
+        delete[] mCompositionTimeDeltaEntries;
+        mCompositionTimeDeltaEntries = NULL;
+
+        return ERROR_IO;
+    }
+
+    for (size_t i = 0; i < 2 * numEntries; ++i) {
+        mCompositionTimeDeltaEntries[i] = ntohl(mCompositionTimeDeltaEntries[i]);
+    }
+
+    return OK;
+}
+
 status_t SampleTable::setSyncSampleParams(off64_t data_offset, size_t data_size) {
     if (mSyncSampleOffset >= 0 || data_size < 8) {
         return ERROR_MALFORMED;
@@ -333,6 +383,8 @@ uint32_t abs_difference(uint32_t time1, uint32_t time2) {
 
 status_t SampleTable::findSampleAtTime(
         uint32_t req_time, uint32_t *sample_index, uint32_t flags) {
+    // XXX this currently uses decoding time, instead of composition time.
+
     *sample_index = 0;
 
     Mutex::Autolock autoLock(mLock);
@@ -607,5 +659,26 @@ status_t SampleTable::getMetaDataForSample(
     return OK;
 }
 
+uint32_t SampleTable::getCompositionTimeOffset(uint32_t sampleIndex) const {
+    if (mCompositionTimeDeltaEntries == NULL) {
+        return 0;
+    }
+
+    uint32_t curSample = 0;
+    for (size_t i = 0; i < mNumCompositionTimeDeltaEntries; ++i) {
+        uint32_t sampleCount = mCompositionTimeDeltaEntries[2 * i];
+
+        if (sampleIndex < curSample + sampleCount) {
+            uint32_t sampleDelta = mCompositionTimeDeltaEntries[2 * i + 1];
+
+            return sampleDelta;
+        }
+
+        curSample += sampleCount;
+    }
+
+    return 0;
+}
+
 }  // namespace android
 
diff --git a/media/libstagefright/include/SampleTable.h b/media/libstagefright/include/SampleTable.h
index c5e8136..2f95de9 100644
--- a/media/libstagefright/include/SampleTable.h
+++ b/media/libstagefright/include/SampleTable.h
@@ -46,6 +46,9 @@ public:
 
     status_t setTimeToSampleParams(off64_t data_offset, size_t data_size);
 
+    status_t setCompositionTimeToSampleParams(
+            off64_t data_offset, size_t data_size);
+
     status_t setSyncSampleParams(off64_t data_offset, size_t data_size);
 
     ////////////////////////////////////////////////////////////////////////////
@@ -104,6 +107,9 @@ private:
     uint32_t mTimeToSampleCount;
     uint32_t *mTimeToSample;
 
+    uint32_t *mCompositionTimeDeltaEntries;
+    size_t mNumCompositionTimeDeltaEntries;
+
     off64_t mSyncSampleOffset;
     uint32_t mNumSyncSamples;
     uint32_t *mSyncSamples;
@@ -122,6 +128,8 @@ private:
 
     status_t getSampleSize_l(uint32_t sample_index, size_t *sample_size);
 
+    uint32_t getCompositionTimeOffset(uint32_t sampleIndex) const;
+
     SampleTable(const SampleTable &);
     SampleTable &operator=(const SampleTable &);
 };