From bff07d0b22a5ee2d9f044f6cb5e4be1532017ab0 Mon Sep 17 00:00:00 2001
From: Andreas Huber <andih@google.com>
Date: Tue, 12 Oct 2010 11:34:37 -0700
Subject: HTTP Live content that are tagged as complete are now seekable.

Change-Id: I9d0d2f009f883e5baf3e9de8c5c0aa05760e4bde
related-to-bug: 2368598
---
 media/libstagefright/httplive/LiveSource.cpp | 70 +++++++++++++++++++++++++++-
 media/libstagefright/httplive/M3UParser.cpp  |  9 +++-
 2 files changed, 77 insertions(+), 2 deletions(-)

(limited to 'media/libstagefright/httplive')

diff --git a/media/libstagefright/httplive/LiveSource.cpp b/media/libstagefright/httplive/LiveSource.cpp
index 943a0fc..4124571 100644
--- a/media/libstagefright/httplive/LiveSource.cpp
+++ b/media/libstagefright/httplive/LiveSource.cpp
@@ -31,6 +31,7 @@ namespace android {
 LiveSource::LiveSource(const char *url)
     : mMasterURL(url),
       mInitCheck(NO_INIT),
+      mDurationUs(-1),
       mPlaylistIndex(0),
       mLastFetchTimeUs(-1),
       mSource(new NuHTTPDataSource),
@@ -40,6 +41,8 @@ LiveSource::LiveSource(const char *url)
       mPrevBandwidthIndex(-1) {
     if (switchToNext()) {
         mInitCheck = OK;
+
+        determineSeekability();
     }
 }
 
@@ -139,7 +142,7 @@ bool LiveSource::loadPlaylist(bool fetchMaster) {
         }
 #else
         // Stay on the lowest bandwidth available.
-        size_t index = 0;  // Lowest bandwidth stream
+        size_t index = mBandwidthItems.size() - 1;  // Highest bandwidth stream
 #endif
 
         mURL = mBandwidthItems.editItemAt(index).mURI;
@@ -336,4 +339,69 @@ status_t LiveSource::fetchM3U(const char *url, sp<ABuffer> *out) {
     return OK;
 }
 
+bool LiveSource::seekTo(int64_t seekTimeUs) {
+    LOGV("seek to %lld us", seekTimeUs);
+
+    if (!mPlaylist->isComplete()) {
+        return false;
+    }
+
+    int32_t targetDuration;
+    if (!mPlaylist->meta()->findInt32("target-duration", &targetDuration)) {
+        return false;
+    }
+
+    int64_t seekTimeSecs = (seekTimeUs + 500000ll) / 1000000ll;
+
+    int64_t index = seekTimeSecs / targetDuration;
+
+    if (index < 0 || index >= mPlaylist->size()) {
+        return false;
+    }
+
+    size_t newPlaylistIndex = mFirstItemSequenceNumber + index;
+
+    if (newPlaylistIndex == mPlaylistIndex) {
+        return false;
+    }
+
+    mPlaylistIndex = newPlaylistIndex;
+
+    switchToNext();
+    mOffsetBias = 0;
+
+    LOGV("seeking to index %lld", index);
+
+    return true;
+}
+
+bool LiveSource::getDuration(int64_t *durationUs) const {
+    if (mDurationUs >= 0) {
+        *durationUs = mDurationUs;
+        return true;
+    }
+
+    *durationUs = 0;
+    return false;
+}
+
+bool LiveSource::isSeekable() const {
+    return mDurationUs >= 0;
+}
+
+void LiveSource::determineSeekability() {
+    mDurationUs = -1;
+
+    if (!mPlaylist->isComplete()) {
+        return;
+    }
+
+    int32_t targetDuration;
+    if (!mPlaylist->meta()->findInt32("target-duration", &targetDuration)) {
+        return;
+    }
+
+    mDurationUs = targetDuration * 1000000ll * mPlaylist->size();
+}
+
 }  // namespace android
diff --git a/media/libstagefright/httplive/M3UParser.cpp b/media/libstagefright/httplive/M3UParser.cpp
index 0d7daa9..a68c641 100644
--- a/media/libstagefright/httplive/M3UParser.cpp
+++ b/media/libstagefright/httplive/M3UParser.cpp
@@ -27,7 +27,8 @@ M3UParser::M3UParser(
     : mInitCheck(NO_INIT),
       mBaseURI(baseURI),
       mIsExtM3U(false),
-      mIsVariantPlaylist(false) {
+      mIsVariantPlaylist(false),
+      mIsComplete(false) {
     mInitCheck = parse(data, size);
 }
 
@@ -46,6 +47,10 @@ bool M3UParser::isVariantPlaylist() const {
     return mIsVariantPlaylist;
 }
 
+bool M3UParser::isComplete() const {
+    return mIsComplete;
+}
+
 sp<AMessage> M3UParser::meta() {
     return mMeta;
 }
@@ -153,6 +158,8 @@ status_t M3UParser::parse(const void *_data, size_t size) {
                     return ERROR_MALFORMED;
                 }
                 err = parseMetaData(line, &mMeta, "media-sequence");
+            } else if (line.startsWith("#EXT-X-ENDLIST")) {
+                mIsComplete = true;
             } else if (line.startsWith("#EXTINF")) {
                 if (mIsVariantPlaylist) {
                     return ERROR_MALFORMED;
-- 
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