Adding Metadata mode to SurfaceMediaSource

SurfaceMediaSource operates in metadata mode only, i.e. just the
metadata is stored in videobuffers. SurfaceMediaSource passes the Gralloc
buffer handle along with a 4 byte 'type' (indicating that the metadata
is of type GrallocSource) to the encoder as opposed to the
GrallocBuffer itself.

Related to bug id: 4529323

Change-Id: I83aebc0dd10f317658cdf70be5802dfc35a1e72d

2 files changed, 15 insertions, 1 deletions

diff --git a/include/media/stagefright/MetadataBufferType.h b/include/media/stagefright/MetadataBufferType.h
index 52a3257..4eaf8ac 100644
--- a/include/media/stagefright/MetadataBufferType.h
+++ b/include/media/stagefright/MetadataBufferType.h
@@ -69,6 +69,16 @@ typedef enum {
      * kMetadataBufferTypeGrallocSource is used to indicate that
      * the payload of the metadata buffers can be interpreted as
      * a buffer_handle_t.
+     * So in this case,the metadata that the encoder receives
+     * will have a byte stream that consists of two parts:
+     * 1. First, there is an integer indicating that it is a GRAlloc
+     * source (kMetadataBufferTypeGrallocSource)
+     * 2. This is followed by the buffer_handle_t that is a handle to the
+     * GRalloc buffer. The encoder needs to interpret this GRalloc handle
+     * and encode the frames.
+     * --------------------------------------------------------------
+     * |  kMetadataBufferTypeGrallocSource | sizeof(buffer_handle_t) |
+     * --------------------------------------------------------------
      */
     kMetadataBufferTypeGrallocSource = 1,
 
diff --git a/include/media/stagefright/SurfaceMediaSource.h b/include/media/stagefright/SurfaceMediaSource.h
index d772701..4c1358a 100644
--- a/include/media/stagefright/SurfaceMediaSource.h
+++ b/include/media/stagefright/SurfaceMediaSource.h
@@ -63,6 +63,10 @@ public:
             MediaBuffer **buffer, const ReadOptions *options = NULL);
     virtual sp<MetaData> getFormat();
 
+    // Pass the metadata over to the buffer, call when you have the lock
+    void passMetadataBufferLocked(MediaBuffer **buffer);
+    bool checkBufferMatchesSlot(int slot, MediaBuffer *buffer);
+
     // Get / Set the frame rate used for encoding. Default fps = 30
     status_t setFrameRate(int32_t fps) ;
     int32_t getFrameRate( ) const;
@@ -152,7 +156,7 @@ public:
     status_t setBufferCountServer(int bufferCount);
 
     // getTimestamp retrieves the timestamp associated with the image
-    // set by the most recent call to updateFrameInfoLocked().
+    // set by the most recent call to read()
     //
     // The timestamp is in nanoseconds, and is monotonically increasing. Its
     // other semantics (zero point, etc) are source-dependent and should be