1 files changed, 63 insertions, 0 deletions
diff --git a/libs/android-transcoder/src/main/java/net/ypresto/androidtranscoder/utils/MediaExtractorUtils.java b/libs/android-transcoder/src/main/java/net/ypresto/androidtranscoder/utils/MediaExtractorUtils.java
new file mode 100644
index 000000000..b973d2f16
--- /dev/null
+++ b/libs/android-transcoder/src/main/java/net/ypresto/androidtranscoder/utils/MediaExtractorUtils.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2014 Yuya Tanaka
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.ypresto.androidtranscoder.utils;
+
+import android.media.MediaExtractor;
+import android.media.MediaFormat;
+
+public class MediaExtractorUtils {
+
+    private MediaExtractorUtils() {
+    }
+
+    public static class TrackResult {
+
+        private TrackResult() {
+        }
+
+        public int mVideoTrackIndex;
+        public String mVideoTrackMime;
+        public MediaFormat mVideoTrackFormat;
+        public int mAudioTrackIndex;
+        public String mAudioTrackMime;
+        public MediaFormat mAudioTrackFormat;
+    }
+
+    public static TrackResult getFirstVideoAndAudioTrack(MediaExtractor extractor) {
+        TrackResult trackResult = new TrackResult();
+        trackResult.mVideoTrackIndex = -1;
+        trackResult.mAudioTrackIndex = -1;
+        int trackCount = extractor.getTrackCount();
+        for (int i = 0; i < trackCount; i++) {
+            MediaFormat format = extractor.getTrackFormat(i);
+            String mime = format.getString(MediaFormat.KEY_MIME);
+            if (trackResult.mVideoTrackIndex < 0 && mime.startsWith("video/")) {
+                trackResult.mVideoTrackIndex = i;
+                trackResult.mVideoTrackMime = mime;
+                trackResult.mVideoTrackFormat = format;
+            } else if (trackResult.mAudioTrackIndex < 0 && mime.startsWith("audio/")) {
+                trackResult.mAudioTrackIndex = i;
+                trackResult.mAudioTrackMime = mime;
+                trackResult.mAudioTrackFormat = format;
+            }
+            if (trackResult.mVideoTrackIndex >= 0 && trackResult.mAudioTrackIndex >= 0) break;
+        }
+        if (trackResult.mVideoTrackIndex < 0 || trackResult.mAudioTrackIndex < 0) {
+            throw new IllegalArgumentException("extractor does not contain video and/or audio tracks.");
+        }
+        return trackResult;
+    }
+}