Adding ChunkDemuxer implementation.

media/webm/webm_info_parser.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/webm/webm_info_parser.h"
+
+#include "base/logging.h"
+#include "media/webm/webm_constants.h"
+
+namespace media {
+
+WebMInfoParser::WebMInfoParser()
+    : timecode_scale_(-1),
+      duration_(-1) {
+}
+
+WebMInfoParser::~WebMInfoParser() {}
+
+int WebMInfoParser::Parse(const uint8* buf, int size) {
+  return WebMParseListElement(buf, size, kWebMIdInfo, 1, this);
+}
+
+int64 WebMInfoParser::timecode_scale() const { return timecode_scale_; }
+
+double WebMInfoParser::duration() const { return duration_; }
+
+bool WebMInfoParser::OnListStart(int id) { return true; }
+
+bool WebMInfoParser::OnListEnd(int id) {
+  if (id == kWebMIdInfo && timecode_scale_ == -1) {
+    // Set timecode scale to default value if it isn't present in
+    // the Info element.
+    timecode_scale_ = kWebMDefaultTimecodeScale;
+  }
+  return true;
+}
+
+bool WebMInfoParser::OnUInt(int id, int64 val) {
+  if (id != kWebMIdTimecodeScale)
+    return true;
+
+  if (timecode_scale_ != -1) {
+    VLOG(1) << "Multiple values for id " << std::hex << id << " specified";
+    return false;
+  }
+
+  timecode_scale_ = val;
+  return true;
+}
+
+bool WebMInfoParser::OnFloat(int id, double val) {
+  if (id != kWebMIdDuration) {
+    VLOG(1) << "Unexpected float for id" << std::hex << id;
+    return false;
+  }
+
+  if (duration_ != -1) {
+    VLOG(1) << "Multiple values for duration.";
+    return false;
+  }
+
+  duration_ = val;
+  return true;
+}
+
+bool WebMInfoParser::OnBinary(int id, const uint8* data, int size) {
+  return true;
+}
+
+bool WebMInfoParser::OnString(int id, const std::string& str) {
+  return true;
+}
+
+bool WebMInfoParser::OnSimpleBlock(int track_num, int timecode, int flags,
+                                   const uint8* data, int size) {
+  return false;
+}
+
+}  // namespace media