Adding ChunkDemuxer implementation.

media/webm/webm_cluster_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_cluster_parser.h"
+
+#include "base/logging.h"
+#include "media/base/data_buffer.h"
+#include "media/webm/webm_constants.h"
+
+namespace media {
+
+static Buffer* CreateBuffer(const uint8* data, size_t size) {
+  scoped_array<uint8> buf(new uint8[size]);
+  memcpy(buf.get(), data, size);
+  return new DataBuffer(buf.release(), size);
+}
+
+WebMClusterParser::WebMClusterParser(int64 timecode_scale,
+                                     int audio_track_num,
+                                     base::TimeDelta audio_default_duration,
+                                     int video_track_num,
+                                     base::TimeDelta video_default_duration)
+    : timecode_multiplier_(timecode_scale / 1000.0),
+      audio_track_num_(audio_track_num),
+      audio_default_duration_(audio_default_duration),
+      video_track_num_(video_track_num),
+      video_default_duration_(video_default_duration),
+      last_block_timecode_(-1),
+      cluster_timecode_(-1) {
+}
+
+WebMClusterParser::~WebMClusterParser() {}
+
+int WebMClusterParser::Parse(const uint8* buf, int size) {
+  last_block_timecode_ = -1;
+  cluster_timecode_ = -1;
+  audio_buffers_.clear();
+  video_buffers_.clear();
+
+  return WebMParseListElement(buf, size, kWebMIdCluster, 1, this);
+}
+
+bool WebMClusterParser::OnListStart(int id) {
+  if (id == kWebMIdCluster)
+    cluster_timecode_ = -1;
+
+  return true;
+}
+
+bool WebMClusterParser::OnListEnd(int id) {
+  if (id == kWebMIdCluster)
+    cluster_timecode_ = -1;
+
+  return true;
+}
+
+bool WebMClusterParser::OnUInt(int id, int64 val) {
+  if (id == kWebMIdTimecode) {
+    if (cluster_timecode_ != -1)
+      return false;
+
+    cluster_timecode_ = val;
+  }
+
+  return true;
+}
+
+bool WebMClusterParser::OnFloat(int id, double val) {
+  VLOG(1) << "Unexpected float element with ID " << std::hex << id;
+  return false;
+}
+
+bool WebMClusterParser::OnBinary(int id, const uint8* data, int size) {
+  VLOG(1) << "Unexpected binary element with ID " << std::hex << id;
+  return false;
+}
+
+bool WebMClusterParser::OnString(int id, const std::string& str) {
+  VLOG(1) << "Unexpected string element with ID " << std::hex << id;
+  return false;
+}
+
+bool WebMClusterParser::OnSimpleBlock(int track_num, int timecode,
+                                      int flags,
+                                      const uint8* data, int size) {
+  if (cluster_timecode_ == -1) {
+    VLOG(1) << "Got SimpleBlock before cluster timecode.";
+    return false;
+  }
+
+  if (timecode < 0) {
+    VLOG(1) << "Got SimpleBlock with negative timecode offset " << timecode;
+    return false;
+  }
+
+  if (last_block_timecode_ != -1 && timecode < last_block_timecode_) {
+    VLOG(1) << "Got SimpleBlock with a timecode before the previous block.";
+    return false;
+  }
+
+  last_block_timecode_ = timecode;
+
+  base::TimeDelta timestamp = base::TimeDelta::FromMicroseconds(
+      (cluster_timecode_ + timecode) * timecode_multiplier_);
+
+  scoped_refptr<Buffer> buffer(CreateBuffer(data, size));
+  buffer->SetTimestamp(timestamp);
+  BufferQueue* queue = NULL;
+
+  if (track_num == audio_track_num_) {
+    buffer->SetDuration(audio_default_duration_);
+    queue = &audio_buffers_;
+  } else if (track_num == video_track_num_) {
+    buffer->SetDuration(video_default_duration_);
+    queue = &video_buffers_;
+  } else {
+    VLOG(1) << "Unexpected track number " << track_num;
+    return false;
+  }
+
+  if (!queue->empty() &&
+      buffer->GetTimestamp() == queue->back()->GetTimestamp()) {
+    VLOG(1) << "Got SimpleBlock timecode is not strictly monotonically "
+            << "increasing for track " << track_num;
+    return false;
+  }
+
+  queue->push_back(buffer);
+  return true;
+}
+
+}  // namespace media