From 8f658214537c08e91616a3a283f940f759b65674 Mon Sep 17 00:00:00 2001
From: Andreas Huber <andih@google.com>
Date: Mon, 7 Dec 2009 16:32:37 -0800
Subject: Minor tweaks to the mp3 and aac software decoders, propagate duration
 to output format.

---
 media/libstagefright/codecs/aacdec/AACDecoder.cpp | 19 ++++++++++++-------
 media/libstagefright/codecs/mp3dec/MP3Decoder.cpp |  6 ++++++
 media/libstagefright/include/AACDecoder.h         |  2 +-
 3 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/media/libstagefright/codecs/aacdec/AACDecoder.cpp b/media/libstagefright/codecs/aacdec/AACDecoder.cpp
index 03ac88d..5c77a3a 100644
--- a/media/libstagefright/codecs/aacdec/AACDecoder.cpp
+++ b/media/libstagefright/codecs/aacdec/AACDecoder.cpp
@@ -17,7 +17,7 @@ AACDecoder::AACDecoder(const sp<MediaSource> &source)
       mBufferGroup(NULL),
       mConfig(new tPVMP4AudioDecoderExternal),
       mDecoderBuf(NULL),
-      mLastSeekTimeUs(0),
+      mAnchorTimeUs(0),
       mNumSamplesOutput(0),
       mInputBuffer(NULL) {
 }
@@ -79,7 +79,7 @@ status_t AACDecoder::start(MetaData *params) {
 
     mSource->start();
 
-    mLastSeekTimeUs = 0;
+    mAnchorTimeUs = 0;
     mNumSamplesOutput = 0;
     mStarted = true;
 
@@ -112,13 +112,16 @@ sp<MetaData> AACDecoder::getFormat() {
 
     int32_t numChannels;
     int32_t sampleRate;
+    int64_t durationUs;
     CHECK(srcFormat->findInt32(kKeyChannelCount, &numChannels));
     CHECK(srcFormat->findInt32(kKeySampleRate, &sampleRate));
+    CHECK(srcFormat->findInt64(kKeyDuration, &durationUs));
 
     sp<MetaData> meta = new MetaData;
     meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_RAW);
     meta->setInt32(kKeyChannelCount, numChannels);
     meta->setInt32(kKeySampleRate, sampleRate);
+    meta->setInt64(kKeyDuration, durationUs);
 
     return meta;
 }
@@ -150,11 +153,13 @@ status_t AACDecoder::read(
             return err;
         }
 
-        if (seekTimeUs >= 0) {
-            CHECK(mInputBuffer->meta_data()->findInt64(
-                        kKeyTime, &mLastSeekTimeUs));
-
+        int64_t timeUs;
+        if (mInputBuffer->meta_data()->findInt64(kKeyTime, &timeUs)) {
+            mAnchorTimeUs = timeUs;
             mNumSamplesOutput = 0;
+        } else {
+            // We must have a new timestamp after seeking.
+            CHECK(seekTimeUs < 0);
         }
     }
 
@@ -189,7 +194,7 @@ status_t AACDecoder::read(
 
     buffer->meta_data()->setInt64(
             kKeyTime,
-            mLastSeekTimeUs
+            mAnchorTimeUs
                 + (mNumSamplesOutput * 1000000) / mConfig->samplingRate);
 
     mNumSamplesOutput += mConfig->frameLength;
diff --git a/media/libstagefright/codecs/mp3dec/MP3Decoder.cpp b/media/libstagefright/codecs/mp3dec/MP3Decoder.cpp
index 45e20dc..f9193c0 100644
--- a/media/libstagefright/codecs/mp3dec/MP3Decoder.cpp
+++ b/media/libstagefright/codecs/mp3dec/MP3Decoder.cpp
@@ -78,13 +78,16 @@ sp<MetaData> MP3Decoder::getFormat() {
 
     int32_t numChannels;
     int32_t sampleRate;
+    int64_t durationUs;
     CHECK(srcFormat->findInt32(kKeyChannelCount, &numChannels));
     CHECK(srcFormat->findInt32(kKeySampleRate, &sampleRate));
+    CHECK(srcFormat->findInt64(kKeyDuration, &durationUs));
 
     sp<MetaData> meta = new MetaData;
     meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_RAW);
     meta->setInt32(kKeyChannelCount, numChannels);
     meta->setInt32(kKeySampleRate, sampleRate);
+    meta->setInt64(kKeyDuration, durationUs);
 
     return meta;
 }
@@ -120,6 +123,9 @@ status_t MP3Decoder::read(
         if (mInputBuffer->meta_data()->findInt64(kKeyTime, &timeUs)) {
             mAnchorTimeUs = timeUs;
             mNumSamplesOutput = 0;
+        } else {
+            // We must have a new timestamp after seeking.
+            CHECK(seekTimeUs < 0);
         }
     }
 
diff --git a/media/libstagefright/include/AACDecoder.h b/media/libstagefright/include/AACDecoder.h
index 303d854..f09addd 100644
--- a/media/libstagefright/include/AACDecoder.h
+++ b/media/libstagefright/include/AACDecoder.h
@@ -48,7 +48,7 @@ private:
 
     tPVMP4AudioDecoderExternal *mConfig;
     void *mDecoderBuf;
-    int64_t mLastSeekTimeUs;
+    int64_t mAnchorTimeUs;
     int64_t mNumSamplesOutput;
 
     MediaBuffer *mInputBuffer;
-- 
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