From 37746afe186ce04f0f6252900b79726040d89a0d Mon Sep 17 00:00:00 2001
From: Terry Heo <terryheo@google.com>
Date: Wed, 25 Mar 2015 17:38:27 +0900
Subject: mpeg2ts: Set SAMPLE_FLAG_SYNC for mpeg2ts stream

Added logic to find sync frame of mpeg2, mpeg4 and h264

Bug: 19940277
Change-Id: I4d95ae247f590b831bf11ff8c9c6fe45d21dab56
---
 .../libstagefright/mpeg2ts/AnotherPacketSource.cpp |  5 ++++
 media/libstagefright/mpeg2ts/ESQueue.cpp           | 29 ++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/media/libstagefright/mpeg2ts/AnotherPacketSource.cpp b/media/libstagefright/mpeg2ts/AnotherPacketSource.cpp
index c5bb41b..f8aee72 100644
--- a/media/libstagefright/mpeg2ts/AnotherPacketSource.cpp
+++ b/media/libstagefright/mpeg2ts/AnotherPacketSource.cpp
@@ -183,6 +183,11 @@ status_t AnotherPacketSource::read(
 
         mediaBuffer->meta_data()->setInt64(kKeyTime, timeUs);
 
+        int32_t isSync;
+        if (buffer->meta()->findInt32("isSync", &isSync)) {
+            mediaBuffer->meta_data()->setInt32(kKeyIsSyncFrame, isSync);
+        }
+
         *out = mediaBuffer;
         return OK;
     }
diff --git a/media/libstagefright/mpeg2ts/ESQueue.cpp b/media/libstagefright/mpeg2ts/ESQueue.cpp
index b17985c..a279049 100644
--- a/media/libstagefright/mpeg2ts/ESQueue.cpp
+++ b/media/libstagefright/mpeg2ts/ESQueue.cpp
@@ -533,6 +533,7 @@ sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitAC3() {
     int64_t timeUs = fetchTimestamp(syncStartPos + payloadSize);
     CHECK_GE(timeUs, 0ll);
     accessUnit->meta()->setInt64("timeUs", timeUs);
+    accessUnit->meta()->setInt32("isSync", 1);
 
     memmove(
             mBuffer->data(),
@@ -582,6 +583,7 @@ sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitPCMAudio() {
     int64_t timeUs = fetchTimestamp(payloadSize + 4);
     CHECK_GE(timeUs, 0ll);
     accessUnit->meta()->setInt64("timeUs", timeUs);
+    accessUnit->meta()->setInt32("isSync", 1);
 
     int16_t *ptr = (int16_t *)accessUnit->data();
     for (size_t i = 0; i < payloadSize / sizeof(int16_t); ++i) {
@@ -693,6 +695,7 @@ sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitAAC() {
     mBuffer->setRange(0, mBuffer->size() - offset);
 
     accessUnit->meta()->setInt64("timeUs", timeUs);
+    accessUnit->meta()->setInt32("isSync", 1);
 
     return accessUnit;
 }
@@ -743,6 +746,7 @@ sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitH264() {
     const uint8_t *nalStart;
     size_t nalSize;
     bool foundSlice = false;
+    bool foundIDR = false;
     while ((err = getNextNALUnit(&data, &size, &nalStart, &nalSize)) == OK) {
         if (nalSize == 0) continue;
 
@@ -750,6 +754,9 @@ sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitH264() {
         bool flush = false;
 
         if (nalType == 1 || nalType == 5) {
+            if (nalType == 5) {
+                foundIDR = true;
+            }
             if (foundSlice) {
                 ABitReader br(nalStart + 1, nalSize);
                 unsigned first_mb_in_slice = parseUE(&br);
@@ -838,6 +845,9 @@ sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitH264() {
             CHECK_GE(timeUs, 0ll);
 
             accessUnit->meta()->setInt64("timeUs", timeUs);
+            if (foundIDR) {
+                accessUnit->meta()->setInt32("isSync", 1);
+            }
 
             if (mFormat == NULL) {
                 mFormat = MakeAVCCodecSpecificData(accessUnit);
@@ -894,6 +904,7 @@ sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitMPEGAudio() {
     CHECK_GE(timeUs, 0ll);
 
     accessUnit->meta()->setInt64("timeUs", timeUs);
+    accessUnit->meta()->setInt32("isSync", 1);
 
     if (mFormat == NULL) {
         mFormat = new MetaData;
@@ -970,6 +981,9 @@ sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitMPEGVideo() {
     int pprevStartCode = -1;
     int prevStartCode = -1;
     int currentStartCode = -1;
+    bool gopFound = false;
+    bool isClosedGop = false;
+    bool brokenLink = false;
 
     size_t offset = 0;
     while (offset + 3 < size) {
@@ -1032,6 +1046,13 @@ sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitMPEGVideo() {
             }
         }
 
+        if (mFormat != NULL && currentStartCode == 0xb8) {
+            // GOP layer
+            gopFound = true;
+            isClosedGop = (data[offset + 7] & 0x40) != 0;
+            brokenLink = (data[offset + 7] & 0x20) != 0;
+        }
+
         if (mFormat != NULL && currentStartCode == 0x00) {
             // Picture start
 
@@ -1053,6 +1074,9 @@ sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitMPEGVideo() {
                 offset = 0;
 
                 accessUnit->meta()->setInt64("timeUs", timeUs);
+                if (gopFound && (!brokenLink || isClosedGop)) {
+                    accessUnit->meta()->setInt32("isSync", 1);
+                }
 
                 ALOGV("returning MPEG video access unit at time %" PRId64 " us",
                       timeUs);
@@ -1197,6 +1221,8 @@ sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitMPEG4Video() {
             case SKIP_TO_VOP_START:
             {
                 if (chunkType == 0xb6) {
+                    int vopCodingType = (data[offset + 4] & 0xc0) >> 6;
+
                     offset += chunkSize;
 
                     sp<ABuffer> accessUnit = new ABuffer(offset);
@@ -1212,6 +1238,9 @@ sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitMPEG4Video() {
                     offset = 0;
 
                     accessUnit->meta()->setInt64("timeUs", timeUs);
+                    if (vopCodingType == 0) {  // intra-coded VOP
+                        accessUnit->meta()->setInt32("isSync", 1);
+                    }
 
                     ALOGV("returning MPEG4 video access unit at time %" PRId64 " us",
                          timeUs);
-- 
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