1 files changed, 82 insertions, 0 deletions
diff --git a/dom/media/ogg/OggDecoder.cpp b/dom/media/ogg/OggDecoder.cpp
new file mode 100644
index 0000000000..5f6d61f694
--- /dev/null
+++ b/dom/media/ogg/OggDecoder.cpp
@@ -0,0 +1,82 @@
+/* -*- 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 "OggDecoder.h"
+#include "MediaContainerType.h"
+#include "MediaDecoder.h"
+#include "mozilla/StaticPrefs_media.h"
+#include "nsMimeTypes.h"
+
+namespace mozilla {
+
+/* static */
+bool OggDecoder::IsSupportedType(const MediaContainerType& aContainerType) {
+  if (!StaticPrefs::media_ogg_enabled()) {
+    return false;
+  }
+
+  if (aContainerType.Type() != MEDIAMIMETYPE(AUDIO_OGG) &&
+      aContainerType.Type() != MEDIAMIMETYPE(VIDEO_OGG) &&
+      aContainerType.Type() != MEDIAMIMETYPE("application/ogg")) {
+    return false;
+  }
+
+  const bool isOggVideo = (aContainerType.Type() != MEDIAMIMETYPE(AUDIO_OGG));
+
+  const MediaCodecs& codecs = aContainerType.ExtendedType().Codecs();
+  if (codecs.IsEmpty()) {
+    // Ogg guarantees that the only codecs it contained are supported.
+    return true;
+  }
+  // Verify that all the codecs specified are ones that we expect that
+  // we can play.
+  for (const auto& codec : codecs.Range()) {
+    if ((MediaDecoder::IsOpusEnabled() && codec.EqualsLiteral("opus")) ||
+        codec.EqualsLiteral("vorbis") || codec.EqualsLiteral("flac")) {
+      continue;
+    }
+    // Note: Only accept Theora in a video container type, not in an audio
+    // container type.
+    if (isOggVideo && codec.EqualsLiteral("theora")) {
+      continue;
+    }
+    // Some unsupported codec.
+    return false;
+  }
+  return true;
+}
+
+/* static */
+nsTArray<UniquePtr<TrackInfo>> OggDecoder::GetTracksInfo(
+    const MediaContainerType& aType) {
+  nsTArray<UniquePtr<TrackInfo>> tracks;
+  if (!IsSupportedType(aType)) {
+    return tracks;
+  }
+
+  const MediaCodecs& codecs = aType.ExtendedType().Codecs();
+  if (codecs.IsEmpty()) {
+    // Codecs must be specified for ogg as it can't be implied.
+    return tracks;
+  }
+
+  for (const auto& codec : codecs.Range()) {
+    if (codec.EqualsLiteral("opus") || codec.EqualsLiteral("vorbis") ||
+        codec.EqualsLiteral("flac")) {
+      tracks.AppendElement(
+          CreateTrackInfoWithMIMETypeAndContainerTypeExtraParameters(
+              "audio/"_ns + NS_ConvertUTF16toUTF8(codec), aType));
+    } else {
+      MOZ_ASSERT(codec.EqualsLiteral("theora"));
+      tracks.AppendElement(
+          CreateTrackInfoWithMIMETypeAndContainerTypeExtraParameters(
+              "video/"_ns + NS_ConvertUTF16toUTF8(codec), aType));
+    }
+  }
+  return tracks;
+}
+
+}  // namespace mozilla