Adding ChunkDemuxer implementation.

media/filters/ffmpeg_glue.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/filters/ffmpeg_glue.h"
 
 #include "base/logging.h"
 #include "base/stringprintf.h"
 #include "media/base/filters.h"
 #include "media/ffmpeg/ffmpeg_common.h"
@@ skipping 119 matching lines @@
 
   // Register our protocol glue code with FFmpeg.
   avcodec_init();
   av_register_protocol2(&kFFmpegURLProtocol, sizeof(kFFmpegURLProtocol));
   av_lockmgr_register(&LockManagerOperation);
 
   // Now register the rest of FFmpeg.
   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);
 }
 
 // static
 FFmpegGlue* FFmpegGlue::GetInstance() {
   return Singleton<FFmpegGlue>::get();
 }
 
 std::string FFmpegGlue::AddProtocol(FFmpegURLProtocol* protocol) {
@@ skipping 29 matching lines @@
 }
 
 std::string FFmpegGlue::GetProtocolKey(FFmpegURLProtocol* protocol) {
   // Use the FFmpegURLProtocol's memory address to generate the unique string.
   // This also has the nice property that adding the same FFmpegURLProtocol
   // reference will not generate duplicate entries.
   return base::StringPrintf("%s://%p", kProtocol, static_cast<void*>(protocol));
 }
 
 }  // namespace media