Adding ChunkDemuxer implementation.

media/filters/ffmpeg_glue.cc

Index: media/filters/ffmpeg_glue.cc
diff --git a/media/filters/ffmpeg_glue.cc b/media/filters/ffmpeg_glue.cc
index 23f0a364ddad5efd108d63544ab5c23e5aa9ab0a..39ec1ab2e07cf7e4e9a58c853d2cd86c6c82c0fc 100644
--- a/media/filters/ffmpeg_glue.cc
+++ b/media/filters/ffmpeg_glue.cc
@@ -137,6 +137,53 @@ FFmpegGlue::FFmpegGlue() {
   av_register_all();
 }
 
+BufferUrlProtocol::BufferUrlProtocol(const uint8* buf, int size,
+                                     bool streaming)
+    : buf_(buf),
+      size_(size),
+      offset_(0),
+      streaming_(streaming) {
+}
+
+BufferUrlProtocol::~BufferUrlProtocol() {}
+
+int BufferUrlProtocol::Read(int size, uint8* data) {
+  int bytes_to_copy = size;
+  int bytes_left = size_ - offset_;
+
+  if (bytes_to_copy > bytes_left)
+    bytes_to_copy = bytes_left;
+
+  if (bytes_to_copy == 0)
+    return 0;
+
+  memcpy(data, buf_ + offset_, bytes_to_copy);
+  offset_ += bytes_to_copy;
+
+  return bytes_to_copy;
+}
+
+bool BufferUrlProtocol::GetPosition(int64* position_out) {
+  *position_out = offset_;
+  return true;
+}
+
+bool BufferUrlProtocol::SetPosition(int64 position) {
+  if (position < 0 || position >= size_)
+    return false;
+
+  offset_ = position;
+  return true;
+}
+
+bool BufferUrlProtocol::GetSize(int64* size_out) {
+  *size_out = size_;
+  return true;
+}
+
+bool BufferUrlProtocol::IsStreaming() { return streaming_; }
+
+
 FFmpegGlue::~FFmpegGlue() {
   av_lockmgr_register(NULL);
 }