From a5a103c579d5ecde233e04c00c90f4d15b216f29 Mon Sep 17 00:00:00 2001
From: Marco Nelissen <marcone@google.com>
Date: Thu, 26 Jun 2014 07:49:02 -0700
Subject: Fix AAC timestamps

When playing an mpeg-2 transport stream with AAC audio, there will be
more than one packet per input buffer, resulting in multiple output
buffers for each input buffers. Additional timestamps needs to be
generated in that case.

b/15755476

Change-Id: I2df50b0cb3690eb36d56871daa1263de0028db06
---
 media/libstagefright/codecs/aacdec/SoftAAC2.cpp | 38 +++++++++++++++++--------
 media/libstagefright/codecs/aacdec/SoftAAC2.h   |  4 ++-
 2 files changed, 29 insertions(+), 13 deletions(-)

diff --git a/media/libstagefright/codecs/aacdec/SoftAAC2.cpp b/media/libstagefright/codecs/aacdec/SoftAAC2.cpp
index 64bf2b6..ab30865 100644
--- a/media/libstagefright/codecs/aacdec/SoftAAC2.cpp
+++ b/media/libstagefright/codecs/aacdec/SoftAAC2.cpp
@@ -65,10 +65,9 @@ SoftAAC2::SoftAAC2(
       mInputBufferCount(0),
       mOutputBufferCount(0),
       mSignalledError(false),
+      mLastInHeader(NULL),
+      mCurrentInputTime(0),
       mOutputPortSettingsChange(NONE) {
-    for (unsigned int i = 0; i < kNumDelayBlocksMax; i++) {
-        mAnchorTimeUs[i] = 0;
-    }
     initPorts();
     CHECK_EQ(initDecoder(), (status_t)OK);
 }
@@ -496,14 +495,11 @@ void SoftAAC2::onQueueFilled(OMX_U32 portIndex) {
             } else {
                 mEndOfInput = false;
             }
-            if (inHeader->nOffset == 0) { // TODO: does nOffset != 0 happen?
-                mAnchorTimeUs[mInputBufferCount % kNumDelayBlocksMax] =
-                        inHeader->nTimeStamp;
-            }
 
             if (inHeader->nFilledLen == 0) {
                 inInfo->mOwnedByUs = false;
                 inQueue.erase(inQueue.begin());
+                mLastInHeader = NULL;
                 inInfo = NULL;
                 notifyEmptyBufferDone(inHeader);
                 inHeader = NULL;
@@ -568,6 +564,18 @@ void SoftAAC2::onQueueFilled(OMX_U32 portIndex) {
                 INT prevSampleRate = mStreamInfo->sampleRate;
                 INT prevNumChannels = mStreamInfo->numChannels;
 
+                if (inHeader != mLastInHeader) {
+                    mLastInHeader = inHeader;
+                    mCurrentInputTime = inHeader->nTimeStamp;
+                } else {
+                    if (mStreamInfo->sampleRate) {
+                        mCurrentInputTime += mStreamInfo->aacSamplesPerFrame *
+                                1000000ll / mStreamInfo->sampleRate;
+                    } else {
+                        ALOGW("no sample rate yet");
+                    }
+                }
+                mAnchorTimes.add(mCurrentInputTime);
                 aacDecoder_Fill(mAACDecoder,
                                 inBuffer,
                                 inBufferLength,
@@ -671,6 +679,7 @@ void SoftAAC2::onQueueFilled(OMX_U32 portIndex) {
                             inInfo->mOwnedByUs = false;
                             mInputBufferCount++;
                             inQueue.erase(inQueue.begin());
+                            mLastInHeader = NULL;
                             inInfo = NULL;
                             notifyEmptyBufferDone(inHeader);
                             inHeader = NULL;
@@ -687,11 +696,12 @@ void SoftAAC2::onQueueFilled(OMX_U32 portIndex) {
                     inInfo->mOwnedByUs = false;
                     mInputBufferCount++;
                     inQueue.erase(inQueue.begin());
+                    mLastInHeader = NULL;
                     inInfo = NULL;
                     notifyEmptyBufferDone(inHeader);
                     inHeader = NULL;
                 } else {
-                    ALOGW("inHeader->nFilledLen = %d", inHeader->nFilledLen);
+                    ALOGV("inHeader->nFilledLen = %d", inHeader->nFilledLen);
                 }
             }
         }
@@ -779,8 +789,8 @@ void SoftAAC2::onQueueFilled(OMX_U32 portIndex) {
                 outHeader->nFlags = 0;
             }
 
-            outHeader->nTimeStamp = mAnchorTimeUs[mOutputBufferCount
-                    % kNumDelayBlocksMax];
+            outHeader->nTimeStamp = mAnchorTimes.isEmpty() ? 0 : mAnchorTimes.itemAt(0);
+            mAnchorTimes.removeAt(0);
 
             mOutputBufferCount++;
             outInfo->mOwnedByUs = false;
@@ -820,8 +830,8 @@ void SoftAAC2::onQueueFilled(OMX_U32 portIndex) {
                     outHeader->nFilledLen = 0;
                     outHeader->nFlags = OMX_BUFFERFLAG_EOS;
 
-                    outHeader->nTimeStamp = mAnchorTimeUs[mOutputBufferCount
-                            % kNumDelayBlocksMax];
+                    outHeader->nTimeStamp = mAnchorTimes.itemAt(0);
+                    mAnchorTimes.removeAt(0);
 
                     mOutputBufferCount++;
                     outInfo->mOwnedByUs = false;
@@ -842,6 +852,8 @@ void SoftAAC2::onPortFlushCompleted(OMX_U32 portIndex) {
         // depend on fragments from the last one decoded.
         // drain all existing data
         drainDecoder();
+        mAnchorTimes.clear();
+        mLastInHeader = NULL;
     } else {
         while (outputDelayRingBufferSamplesAvailable() > 0) {
             int32_t ns = outputDelayRingBufferGetSamples(0,
@@ -896,6 +908,8 @@ void SoftAAC2::onReset() {
     mOutputDelayRingBufferReadPos = 0;
     mEndOfInput = false;
     mEndOfOutput = false;
+    mAnchorTimes.clear();
+    mLastInHeader = NULL;
 
     // To make the codec behave the same before and after a reset, we need to invalidate the
     // streaminfo struct. This does that:
diff --git a/media/libstagefright/codecs/aacdec/SoftAAC2.h b/media/libstagefright/codecs/aacdec/SoftAAC2.h
index 5cde03a..865bd15 100644
--- a/media/libstagefright/codecs/aacdec/SoftAAC2.h
+++ b/media/libstagefright/codecs/aacdec/SoftAAC2.h
@@ -58,7 +58,9 @@ private:
     size_t mInputBufferCount;
     size_t mOutputBufferCount;
     bool mSignalledError;
-    int64_t mAnchorTimeUs[kNumDelayBlocksMax];
+    OMX_BUFFERHEADERTYPE *mLastInHeader;
+    int64_t mCurrentInputTime;
+    Vector<int64_t> mAnchorTimes;
 
     CDrcPresModeWrapper mDrcWrap;
 
-- 
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