import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/media/ogg/OggDecoder.cpp

@@ -0,0 +1,79 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "MediaPrefs.h"
+#include "MediaDecoderStateMachine.h"
+#include "MediaFormatReader.h"
+#include "OggDemuxer.h"
+#include "OggDecoder.h"
+#include "nsContentTypeParser.h"
+
+namespace mozilla {
+
+MediaDecoderStateMachine* OggDecoder::CreateStateMachine()
+{
+  RefPtr<OggDemuxer> demuxer = new OggDemuxer(GetResource());
+  RefPtr<MediaFormatReader> reader =
+    new MediaFormatReader(this, demuxer, GetVideoFrameContainer());
+  demuxer->SetChainingEvents(&reader->TimedMetadataProducer(),
+                             &reader->MediaNotSeekableProducer());
+  return new MediaDecoderStateMachine(this, reader);
+}
+
+/* static */
+bool
+OggDecoder::IsEnabled()
+{
+  return MediaPrefs::OggEnabled();
+}
+
+/* static */
+bool
+OggDecoder::CanHandleMediaType(const nsACString& aMIMETypeExcludingCodecs,
+                               const nsAString& aCodecs)
+{
+  if (!IsEnabled()) {
+    return false;
+  }
+
+  const bool isOggAudio = aMIMETypeExcludingCodecs.EqualsASCII("audio/ogg");
+  const bool isOggVideo =
+    aMIMETypeExcludingCodecs.EqualsASCII("video/ogg") ||
+    aMIMETypeExcludingCodecs.EqualsASCII("application/ogg");
+
+  if (!isOggAudio && !isOggVideo) {
+    return false;
+  }
+
+  nsTArray<nsCString> codecMimes;
+  if (aCodecs.IsEmpty()) {
+    // WebM guarantees that the only codecs it contained are vp8, vp9, opus or vorbis.
+    return true;
+  }
+  // Verify that all the codecs specified are ones that we expect that
+  // we can play.
+  nsTArray<nsString> codecs;
+  if (!ParseCodecsString(aCodecs, codecs)) {
+    return false;
+  }
+  for (const nsString& codec : codecs) {
+    if ((IsOpusEnabled() && codec.EqualsLiteral("opus")) ||
+        codec.EqualsLiteral("vorbis") ||
+        (MediaPrefs::FlacInOgg() && codec.EqualsLiteral("flac"))) {
+      continue;
+    }
+    // Note: Only accept Theora in a video content type, not in an audio
+    // content type.
+    if (isOggVideo && codec.EqualsLiteral("theora")) {
+      continue;
+    }
+    // Some unsupported codec.
+    return false;
+  }
+  return true;
+}
+
+} // namespace mozilla