Add offset support to BitstreamBuffer.

media/base/bitstream_buffer.h

Index: media/base/bitstream_buffer.h
diff --git a/media/base/bitstream_buffer.h b/media/base/bitstream_buffer.h
index 6ff1c059b98ff595a4a45bdac7302554c1d2c100..38660a2f5e2f93ae0fe0ce7144ce54bd81c3eec6 100644
--- a/media/base/bitstream_buffer.h
+++ b/media/base/bitstream_buffer.h
@@ -23,6 +23,17 @@ class MEDIA_EXPORT BitstreamBuffer {
   BitstreamBuffer(int32 id,
                   base::SharedMemoryHandle handle,
                   size_t size,
+                  off_t offset);
+
+  BitstreamBuffer(int32 id,
+                  base::SharedMemoryHandle handle,
+                  size_t size,
+                  base::TimeDelta presentation_timestamp);
+
+  BitstreamBuffer(int32 id,
+                  base::SharedMemoryHandle handle,
+                  size_t size,
+                  off_t offset,
                   base::TimeDelta presentation_timestamp);
 
   ~BitstreamBuffer();
@@ -32,6 +43,7 @@ class MEDIA_EXPORT BitstreamBuffer {
   int32 id() const { return id_; }
   base::SharedMemoryHandle handle() const { return handle_; }
   size_t size() const { return size_; }
+  off_t offset() const { return offset_; }
 

[Pawel Osciak, 2015/12/24 00:58:01]

Please add a comment what offset is.

[Pawel Osciak, 2015/12/24 01:01:38]

Also perhaps please also clarify that size() is for the whole buffer, not from
offset.

[Owen Lin, 2015/12/24 08:01:35]

Done.

[Owen Lin, 2015/12/24 08:01:35]

Done.

   // The timestamp is only valid if it's not equal to |media::kNoTimestamp()|.
   base::TimeDelta presentation_timestamp() const {
@@ -48,6 +60,7 @@ class MEDIA_EXPORT BitstreamBuffer {
   int32 id_;
   base::SharedMemoryHandle handle_;
   size_t size_;
+  off_t offset_;
 
   // This is only set when necessary. For example, AndroidVideoDecodeAccelerator
   // needs the timestamp because the underlying decoder may require it to