Introduce Dolby Vision video codec and Demuxer support

media/formats/mp4/dolby_vision.cc

+// Copyright 2017 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/formats/mp4/dolby_vision.h"
+
+#include "base/logging.h"
+#include "media/base/video_codecs.h"
+#include "media/formats/mp4/box_definitions.h"
+#include "media/formats/mp4/box_reader.h"
+
+namespace media {
+namespace mp4 {
+
+DolbyVisionConfiguration::DolbyVisionConfiguration()
+    : dv_version_major(0),
+      dv_version_minor(0),
+      dv_profile(0),
+      dv_level(0),
+      rpu_present_flag(0),
+      el_present_flag(0),
+      bl_present_flag(0),
+      codec_profile(VIDEO_CODEC_PROFILE_UNKNOWN) {}
+
+DolbyVisionConfiguration::~DolbyVisionConfiguration() {}
+
+FourCC DolbyVisionConfiguration::BoxType() const {
+  return FOURCC_DVCC;
+}
+
+bool DolbyVisionConfiguration::Parse(BoxReader* reader) {
+  return ParseInternal(reader, reader->media_log());
+}
+
+bool DolbyVisionConfiguration::Parse(const uint8_t* data, int data_size) {
+  BufferReader reader(data, data_size);
+  return ParseInternal(&reader, new MediaLog());
+}
+
+bool DolbyVisionConfiguration::ParseInternal(
+    BufferReader* reader,
+    const scoped_refptr<MediaLog>& media_log) {
+  uint16_t profile_track_indication = 0;
+  RCHECK(reader->Read1(&dv_version_major) && reader->Read1(&dv_version_minor) &&
+         reader->Read2(&profile_track_indication));
+
+  dv_profile = profile_track_indication >> 9;
+  dv_level = (profile_track_indication >> 3) & 0x3F;
+  rpu_present_flag = (profile_track_indication >> 2) & 1;
+  el_present_flag = (profile_track_indication >> 1) & 1;
+  bl_present_flag = profile_track_indication & 1;
+
+  switch (dv_profile) {
+    case 0:
+      codec_profile = DOLBYVISION_PROFILE0;
+      break;
+    case 4:
+      codec_profile = DOLBYVISION_PROFILE4;
+      break;
+    case 5:
+      codec_profile = DOLBYVISION_PROFILE5;
+      break;
+    case 7:
+      codec_profile = DOLBYVISION_PROFILE7;
+      break;
+    default:
+      // Deprecated profiles.
+      NOTREACHED();

[wolenetz, 2017/02/18 00:01:03]

Are you sure you want to DCHECK(false) here? There could be a buggy stream that
isn't supported -> we shouldn't crash here, we should just return false and emit
parse failure (even on a debug build), right?

[erickung1, 2017/02/27 17:33:10]

Done.

+      return false;
+  }
+
+  if (media_log.get()) {

[wolenetz, 2017/02/18 00:01:03]

Why the conditioning of the DVLOG on media_log?

[erickung1, 2017/02/27 17:33:10]

Done.

+    DVLOG(2) << "Dolby Vision profile:" << static_cast<int>(dv_profile)
+             << " level:" << static_cast<int>(dv_level)
+             << " has_bl:" << static_cast<int>(bl_present_flag)
+             << " has_el:" << static_cast<int>(el_present_flag)
+             << " has_rpu:" << static_cast<int>(rpu_present_flag)
+             << " profile type:" << codec_profile;
+  }
+
+  return true;
+}
+
+}  // namespace mp4
+}  // namespace media