Checking in media::FFmpegGlue and some common FFmpeg code.

media/base/mock_media_filters.h

Index: media/base/mock_media_filters.h
diff --git a/media/base/mock_media_filters.h b/media/base/mock_media_filters.h
index 079c681a69b0ff98a3fd46d1c91f54e09b7472ac..0620eff78b7595473a091100bb79ffd859ce7b23 100644
--- a/media/base/mock_media_filters.h
+++ b/media/base/mock_media_filters.h
@@ -37,6 +37,7 @@ enum MockDataSourceBehavior {
 struct MockFilterConfig {
   MockFilterConfig()
       : data_source_behavior(MOCK_DATA_SOURCE_NORMAL_INIT),
+        data_source_value('!'),
         has_video(true),
         video_width(1280u),
         video_height(720u),
@@ -52,6 +53,7 @@ struct MockFilterConfig {
   }
 
   MockDataSourceBehavior data_source_behavior;
+  char data_source_value;
   bool has_video;
   size_t video_width;
   size_t video_height;
@@ -76,7 +78,16 @@ class MockDataSource : public DataSource {
 
   explicit MockDataSource(const MockFilterConfig* config)
       : config_(config),
-        position_(0) {
+        position_(0),
+        deleted_(NULL) {
+  }
+
+  MockDataSource(const MockFilterConfig* config, bool* deleted)
+      : config_(config),
+        position_(0),
+        deleted_(deleted) {
+    EXPECT_TRUE(deleted);
+    EXPECT_FALSE(*deleted);
   }
 
   // Implementation of MediaFilter.
@@ -121,7 +132,7 @@ class MockDataSource : public DataSource {
     if (size < read) {
       read = size;
     }
-    memset(data, 0, read);
+    memset(data, config_->data_source_value, read);
     return read;
   }
 
@@ -131,8 +142,6 @@ class MockDataSource : public DataSource {
   }
 
   virtual bool SetPosition(int64 position) {
-    EXPECT_GE(position, 0u);
-    EXPECT_LE(position, config_->media_total_bytes);
     if (position < 0u || position > config_->media_total_bytes) {
       return false;
     }
@@ -141,12 +150,22 @@ class MockDataSource : public DataSource {
   }
 
   virtual bool GetSize(int64* size_out) {
-    *size_out = config_->media_total_bytes;
+    if (config_->media_total_bytes >= 0) {
+      *size_out = config_->media_total_bytes;
+      return true;
+    }
     return false;
   }
 
+  // Simple position getter for unit testing.
+  int64 position() const { return position_; }
+
  private:
-  virtual ~MockDataSource() {}
+  virtual ~MockDataSource() {
+    if (deleted_) {
+      *deleted_ = true;
+    }
+  }
 
   void TaskBehavior() {
     switch (config_->data_source_behavior) {
@@ -166,6 +185,10 @@ class MockDataSource : public DataSource {
   int64 position_;
   MediaFormat media_format_;
 
+  // Set to true inside the destructor.  Used in FFmpegGlue unit tests for
+  // testing proper reference counting.
+  bool* deleted_;
+
   DISALLOW_COPY_AND_ASSIGN(MockDataSource);
 };