1 files changed, 123 insertions, 0 deletions
diff --git a/media/webm/webm_tracks_parser.cc b/media/webm/webm_tracks_parser.cc
new file mode 100644
index 0000000..29b4f33
--- /dev/null
+++ b/media/webm/webm_tracks_parser.cc
@@ -0,0 +1,123 @@
+// 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_tracks_parser.h"
+
+#include "base/logging.h"
+#include "media/webm/webm_constants.h"
+
+namespace media {
+
+WebMTracksParser::WebMTracksParser(int64 timecode_scale)
+    : timecode_scale_(timecode_scale),
+      track_type_(-1),
+      track_num_(-1),
+      track_default_duration_(-1),
+      audio_track_num_(-1),
+      audio_default_duration_(base::TimeDelta::FromMicroseconds(-1)),
+      video_track_num_(-1),
+      video_default_duration_(base::TimeDelta::FromMicroseconds(-1)) {
+}
+
+WebMTracksParser::~WebMTracksParser() {}
+
+int WebMTracksParser::Parse(const uint8* buf, int size) {
+  return WebMParseListElement(buf, size, kWebMIdTracks, 1, this);
+}
+
+
+bool WebMTracksParser::OnListStart(int id) {
+  if (id == kWebMIdTrackEntry) {
+    track_type_ = -1;
+    track_num_ = -1;
+    track_default_duration_ = -1;
+  }
+
+  return true;
+}
+
+bool WebMTracksParser::OnListEnd(int id) {
+  if (id == kWebMIdTrackEntry) {
+    if (track_type_ == -1 || track_num_ == -1) {
+      VLOG(1) << "Missing TrackEntry data"
+              << " TrackType " << track_type_
+              << " TrackNum " << track_num_;
+      return false;
+    }
+
+    // Convert nanoseconds to base::TimeDelta.
+    base::TimeDelta default_duration = base::TimeDelta::FromMicroseconds(
+        track_default_duration_ / 1000.0);
+
+    if (track_type_ == kWebMTrackTypeVideo) {
+      video_track_num_ = track_num_;
+      video_default_duration_ = default_duration;
+    } else if (track_type_ == kWebMTrackTypeAudio) {
+      audio_track_num_ = track_num_;
+      audio_default_duration_ = default_duration;
+    } else {
+      VLOG(1) << "Unexpected TrackType " << track_type_;
+      return false;
+    }
+
+    track_type_ = -1;
+    track_num_ = -1;
+  }
+
+  return true;
+}
+
+bool WebMTracksParser::OnUInt(int id, int64 val) {
+  int64* dst = NULL;
+
+  switch (id) {
+    case kWebMIdTrackNumber:
+      dst = &track_num_;
+      break;
+    case kWebMIdTrackType:
+      dst = &track_type_;
+      break;
+    case  kWebMIdDefaultDuration:
+      dst = &track_default_duration_;
+      break;
+    default:
+      return true;
+  }
+
+  if (*dst != -1) {
+    VLOG(1) << "Multiple values for id " << std::hex << id << " specified";
+    return false;
+  }
+
+  *dst = val;
+  return true;
+}
+
+bool WebMTracksParser::OnFloat(int id, double val) {
+  VLOG(1) << "Unexpected float for id" << std::hex << id;
+  return false;
+}
+
+bool WebMTracksParser::OnBinary(int id, const uint8* data, int size) {
+  return true;
+}
+
+bool WebMTracksParser::OnString(int id, const std::string& str) {
+  if (id != kWebMIdCodecID)
+    return false;
+
+  if (str != "A_VORBIS" && str != "V_VP8") {
+    VLOG(1) << "Unexpected CodecID " << str;
+    return false;
+  }
+
+  return true;
+}
+
+bool WebMTracksParser::OnSimpleBlock(int track_num, int timecode, int flags,
+                                     const uint8* data, int size) {
+  return false;
+}
+
+}  // namespace media