HTTP Live content that are tagged as complete are now seekable.

Change-Id: I9d0d2f009f883e5baf3e9de8c5c0aa05760e4bde
related-to-bug: 2368598

6 files changed, 144 insertions, 20 deletions

diff --git a/media/libstagefright/mpeg2ts/ATSParser.cpp b/media/libstagefright/mpeg2ts/ATSParser.cpp
index 7c9b83a..c88c6c1 100644
--- a/media/libstagefright/mpeg2ts/ATSParser.cpp
+++ b/media/libstagefright/mpeg2ts/ATSParser.cpp
@@ -49,13 +49,17 @@ struct ATSParser::Program : public RefBase {
             unsigned pid, unsigned payload_unit_start_indicator,
             ABitReader *br);
 
-    void signalDiscontinuity();
+    void signalDiscontinuity(bool isASeek);
 
     sp<MediaSource> getSource(SourceType type);
 
+    int64_t convertPTSToTimestamp(uint64_t PTS);
+
 private:
     unsigned mProgramMapPID;
     KeyedVector<unsigned, sp<Stream> > mStreams;
+    bool mFirstPTSValid;
+    uint64_t mFirstPTS;
 
     void parseProgramMap(ABitReader *br);
 
@@ -63,13 +67,13 @@ private:
 };
 
 struct ATSParser::Stream : public RefBase {
-    Stream(unsigned elementaryPID, unsigned streamType);
+    Stream(Program *program, unsigned elementaryPID, unsigned streamType);
 
     void parse(
             unsigned payload_unit_start_indicator,
             ABitReader *br);
 
-    void signalDiscontinuity();
+    void signalDiscontinuity(bool isASeek);
 
     sp<MediaSource> getSource(SourceType type);
 
@@ -77,6 +81,7 @@ protected:
     virtual ~Stream();
 
 private:
+    Program *mProgram;
     unsigned mElementaryPID;
     unsigned mStreamType;
 
@@ -101,7 +106,9 @@ private:
 ////////////////////////////////////////////////////////////////////////////////
 
 ATSParser::Program::Program(unsigned programMapPID)
-    : mProgramMapPID(programMapPID) {
+    : mProgramMapPID(programMapPID),
+      mFirstPTSValid(false),
+      mFirstPTS(0) {
 }
 
 bool ATSParser::Program::parsePID(
@@ -128,9 +135,9 @@ bool ATSParser::Program::parsePID(
     return true;
 }
 
-void ATSParser::Program::signalDiscontinuity() {
+void ATSParser::Program::signalDiscontinuity(bool isASeek) {
     for (size_t i = 0; i < mStreams.size(); ++i) {
-        mStreams.editValueAt(i)->signalDiscontinuity();
+        mStreams.editValueAt(i)->signalDiscontinuity(isASeek);
     }
 }
 
@@ -213,10 +220,12 @@ void ATSParser::Program::parseProgramMap(ABitReader *br) {
         ssize_t index = mStreams.indexOfKey(elementaryPID);
 #if 0  // XXX revisit
         CHECK_LT(index, 0);
-        mStreams.add(elementaryPID, new Stream(elementaryPID, streamType));
+        mStreams.add(elementaryPID,
+                     new Stream(this, elementaryPID, streamType));
 #else
         if (index < 0) {
-            mStreams.add(elementaryPID, new Stream(elementaryPID, streamType));
+            mStreams.add(elementaryPID,
+                         new Stream(this, elementaryPID, streamType));
         }
 #endif
 
@@ -239,10 +248,26 @@ sp<MediaSource> ATSParser::Program::getSource(SourceType type) {
     return NULL;
 }
 
+int64_t ATSParser::Program::convertPTSToTimestamp(uint64_t PTS) {
+    if (!mFirstPTSValid) {
+        mFirstPTSValid = true;
+        mFirstPTS = PTS;
+        PTS = 0;
+    } else if (PTS < mFirstPTS) {
+        PTS = 0;
+    } else {
+        PTS -= mFirstPTS;
+    }
+
+    return (PTS * 100) / 9;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 
-ATSParser::Stream::Stream(unsigned elementaryPID, unsigned streamType)
-    : mElementaryPID(elementaryPID),
+ATSParser::Stream::Stream(
+        Program *program, unsigned elementaryPID, unsigned streamType)
+    : mProgram(program),
+      mElementaryPID(elementaryPID),
       mStreamType(streamType),
       mBuffer(new ABuffer(128 * 1024)),
       mPayloadStarted(false),
@@ -281,13 +306,21 @@ void ATSParser::Stream::parse(
     mBuffer->setRange(0, mBuffer->size() + payloadSizeBits / 8);
 }
 
-void ATSParser::Stream::signalDiscontinuity() {
+void ATSParser::Stream::signalDiscontinuity(bool isASeek) {
     LOGV("Stream discontinuity");
     mPayloadStarted = false;
     mBuffer->setRange(0, 0);
 
     mQueue.clear();
 
+    if (isASeek) {
+        // This is only a "minor" discontinuity, we stay within the same
+        // bitstream.
+
+        mSource->clear();
+        return;
+    }
+
     if (mStreamType == 0x1b && mSource != NULL) {
         // Don't signal discontinuities on audio streams.
         mSource->queueDiscontinuity();
@@ -467,7 +500,7 @@ void ATSParser::Stream::onPayloadData(
     LOGV("onPayloadData mStreamType=0x%02x", mStreamType);
 
     CHECK(PTS_DTS_flags == 2 || PTS_DTS_flags == 3);
-    int64_t timeUs = (PTS * 100) / 9;
+    int64_t timeUs = mProgram->convertPTSToTimestamp(PTS);
 
     status_t err = mQueue.appendData(data, size, timeUs);
     CHECK_EQ(err, (status_t)OK);
@@ -515,9 +548,9 @@ void ATSParser::feedTSPacket(const void *data, size_t size) {
     parseTS(&br);
 }
 
-void ATSParser::signalDiscontinuity() {
+void ATSParser::signalDiscontinuity(bool isASeek) {
     for (size_t i = 0; i < mPrograms.size(); ++i) {
-        mPrograms.editItemAt(i)->signalDiscontinuity();
+        mPrograms.editItemAt(i)->signalDiscontinuity(isASeek);
     }
 }
 
diff --git a/media/libstagefright/mpeg2ts/ATSParser.h b/media/libstagefright/mpeg2ts/ATSParser.h
index 9ec6d7b..11b1de4 100644
--- a/media/libstagefright/mpeg2ts/ATSParser.h
+++ b/media/libstagefright/mpeg2ts/ATSParser.h
@@ -33,7 +33,7 @@ struct ATSParser : public RefBase {
     ATSParser();
 
     void feedTSPacket(const void *data, size_t size);
-    void signalDiscontinuity();
+    void signalDiscontinuity(bool isASeek = false);
 
     enum SourceType {
         AVC_VIDEO,
diff --git a/media/libstagefright/mpeg2ts/AnotherPacketSource.cpp b/media/libstagefright/mpeg2ts/AnotherPacketSource.cpp
index 3f76820..ea747c8 100644
--- a/media/libstagefright/mpeg2ts/AnotherPacketSource.cpp
+++ b/media/libstagefright/mpeg2ts/AnotherPacketSource.cpp
@@ -91,6 +91,10 @@ void AnotherPacketSource::queueAccessUnit(const sp<ABuffer> &buffer) {
         return;
     }
 
+    int64_t timeUs;
+    CHECK(buffer->meta()->findInt64("time", &timeUs));
+    LOGV("queueAccessUnit timeUs=%lld us (%.2f secs)", timeUs, timeUs / 1E6);
+
     Mutex::Autolock autoLock(mLock);
     mBuffers.push_back(buffer);
     mCondition.signal();
@@ -101,10 +105,17 @@ void AnotherPacketSource::queueDiscontinuity() {
     buffer->meta()->setInt32("discontinuity", true);
 
     Mutex::Autolock autoLock(mLock);
+
     mBuffers.push_back(buffer);
     mCondition.signal();
 }
 
+void AnotherPacketSource::clear() {
+    Mutex::Autolock autoLock(mLock);
+    mBuffers.clear();
+    mEOSResult = OK;
+}
+
 void AnotherPacketSource::signalEOS(status_t result) {
     CHECK(result != OK);
 
diff --git a/media/libstagefright/mpeg2ts/AnotherPacketSource.h b/media/libstagefright/mpeg2ts/AnotherPacketSource.h
index 6b43c4e..6999175 100644
--- a/media/libstagefright/mpeg2ts/AnotherPacketSource.h
+++ b/media/libstagefright/mpeg2ts/AnotherPacketSource.h
@@ -43,6 +43,8 @@ struct AnotherPacketSource : public MediaSource {
     void queueDiscontinuity();
     void signalEOS(status_t result);
 
+    void clear();
+
 protected:
     virtual ~AnotherPacketSource();
 
diff --git a/media/libstagefright/mpeg2ts/ESQueue.cpp b/media/libstagefright/mpeg2ts/ESQueue.cpp
index a13287e..b0b9e66 100644
--- a/media/libstagefright/mpeg2ts/ESQueue.cpp
+++ b/media/libstagefright/mpeg2ts/ESQueue.cpp
@@ -42,6 +42,7 @@ sp<MetaData> ElementaryStreamQueue::getFormat() {
 
 void ElementaryStreamQueue::clear() {
     mBuffer->setRange(0, 0);
+    mTimestamps.clear();
     mFormat.clear();
 }
 
diff --git a/media/libstagefright/mpeg2ts/MPEG2TSExtractor.cpp b/media/libstagefright/mpeg2ts/MPEG2TSExtractor.cpp
index 0d96bd1..3176810 100644
--- a/media/libstagefright/mpeg2ts/MPEG2TSExtractor.cpp
+++ b/media/libstagefright/mpeg2ts/MPEG2TSExtractor.cpp
@@ -19,8 +19,11 @@
 #include <utils/Log.h>
 
 #include "include/MPEG2TSExtractor.h"
+#include "include/LiveSource.h"
+#include "include/NuCachedSource2.h"
 
 #include <media/stagefright/DataSource.h>
+#include <media/stagefright/MediaDebug.h>
 #include <media/stagefright/MediaDefs.h>
 #include <media/stagefright/MediaErrors.h>
 #include <media/stagefright/MediaSource.h>
@@ -37,7 +40,8 @@ static const size_t kTSPacketSize = 188;
 struct MPEG2TSSource : public MediaSource {
     MPEG2TSSource(
             const sp<MPEG2TSExtractor> &extractor,
-            const sp<AnotherPacketSource> &impl);
+            const sp<AnotherPacketSource> &impl,
+            bool seekable);
 
     virtual status_t start(MetaData *params = NULL);
     virtual status_t stop();
@@ -50,14 +54,20 @@ private:
     sp<MPEG2TSExtractor> mExtractor;
     sp<AnotherPacketSource> mImpl;
 
+    // If there are both audio and video streams, only the video stream
+    // will be seekable, otherwise the single stream will be seekable.
+    bool mSeekable;
+
     DISALLOW_EVIL_CONSTRUCTORS(MPEG2TSSource);
 };
 
 MPEG2TSSource::MPEG2TSSource(
         const sp<MPEG2TSExtractor> &extractor,
-        const sp<AnotherPacketSource> &impl)
+        const sp<AnotherPacketSource> &impl,
+        bool seekable)
     : mExtractor(extractor),
-      mImpl(impl) {
+      mImpl(impl),
+      mSeekable(seekable) {
 }
 
 status_t MPEG2TSSource::start(MetaData *params) {
@@ -69,13 +79,27 @@ status_t MPEG2TSSource::stop() {
 }
 
 sp<MetaData> MPEG2TSSource::getFormat() {
-    return mImpl->getFormat();
+    sp<MetaData> meta = mImpl->getFormat();
+
+    int64_t durationUs;
+    if (mExtractor->mLiveSource != NULL
+            && mExtractor->mLiveSource->getDuration(&durationUs)) {
+        meta->setInt64(kKeyDuration, durationUs);
+    }
+
+    return meta;
 }
 
 status_t MPEG2TSSource::read(
         MediaBuffer **out, const ReadOptions *options) {
     *out = NULL;
 
+    int64_t seekTimeUs;
+    ReadOptions::SeekMode seekMode;
+    if (mSeekable && options && options->getSeekTo(&seekTimeUs, &seekMode)) {
+        mExtractor->seekTo(seekTimeUs);
+    }
+
     status_t finalResult;
     while (!mImpl->hasBufferAvailable(&finalResult)) {
         if (finalResult != OK) {
@@ -109,7 +133,20 @@ sp<MediaSource> MPEG2TSExtractor::getTrack(size_t index) {
         return NULL;
     }
 
-    return new MPEG2TSSource(this, mSourceImpls.editItemAt(index));
+    bool seekable = true;
+    if (mSourceImpls.size() > 1) {
+        CHECK_EQ(mSourceImpls.size(), 2u);
+
+        sp<MetaData> meta = mSourceImpls.editItemAt(index)->getFormat();
+        const char *mime;
+        CHECK(meta->findCString(kKeyMIMEType, &mime));
+
+        if (!strncasecmp("audio/", mime, 6)) {
+            seekable = false;
+        }
+    }
+
+    return new MPEG2TSSource(this, mSourceImpls.editItemAt(index), seekable);
 }
 
 sp<MetaData> MPEG2TSExtractor::getTrackMetaData(
@@ -189,6 +226,46 @@ status_t MPEG2TSExtractor::feedMore() {
     return OK;
 }
 
+void MPEG2TSExtractor::setLiveSource(const sp<LiveSource> &liveSource) {
+    Mutex::Autolock autoLock(mLock);
+
+    mLiveSource = liveSource;
+}
+
+void MPEG2TSExtractor::seekTo(int64_t seekTimeUs) {
+    Mutex::Autolock autoLock(mLock);
+
+    if (mLiveSource == NULL) {
+        return;
+    }
+
+    if (mDataSource->flags() & DataSource::kIsCachingDataSource) {
+        static_cast<NuCachedSource2 *>(mDataSource.get())->suspend();
+    }
+
+    if (mLiveSource->seekTo(seekTimeUs)) {
+        mParser->signalDiscontinuity(true  /* isSeek */);
+        mOffset = 0;
+    }
+
+    if (mDataSource->flags() & DataSource::kIsCachingDataSource) {
+        static_cast<NuCachedSource2 *>(mDataSource.get())
+            ->clearCacheAndResume();
+    }
+}
+
+uint32_t MPEG2TSExtractor::flags() const {
+    Mutex::Autolock autoLock(mLock);
+
+    uint32_t flags = CAN_PAUSE;
+
+    if (mLiveSource != NULL && mLiveSource->isSeekable()) {
+        flags |= CAN_SEEK_FORWARD | CAN_SEEK_BACKWARD | CAN_SEEK;
+    }
+
+    return flags;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 
 bool SniffMPEG2TS(