tor-browser

The Tor Browser
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OggDecoder.cpp (2121B)

      1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim:set ts=2 sw=2 sts=2 et cindent: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "OggDecoder.h"
      8 
      9 #include "MediaContainerType.h"
     10 #include "MediaDecoder.h"
     11 #include "mozilla/StaticPrefs_media.h"
     12 #include "nsMimeTypes.h"
     13 
     14 namespace mozilla {
     15 
     16 /* static */
     17 bool OggDecoder::IsSupportedType(const MediaContainerType& aContainerType) {
     18  if (!StaticPrefs::media_ogg_enabled()) {
     19    return false;
     20  }
     21 
     22  if (aContainerType.Type() != MEDIAMIMETYPE(AUDIO_OGG) &&
     23      aContainerType.Type() != MEDIAMIMETYPE("application/ogg")) {
     24    return false;
     25  }
     26 
     27  const MediaCodecs& codecs = aContainerType.ExtendedType().Codecs();
     28  if (codecs.IsEmpty()) {
     29    // Ogg guarantees that the only codecs it contained are supported.
     30    return true;
     31  }
     32  // Verify that all the codecs specified are ones that we expect that
     33  // we can play.
     34  for (const auto& codec : codecs.Range()) {
     35    if ((MediaDecoder::IsOpusEnabled() && codec.EqualsLiteral("opus")) ||
     36        codec.EqualsLiteral("vorbis") || codec.EqualsLiteral("flac")) {
     37      continue;
     38    }
     39    // Some unsupported codec.
     40    return false;
     41  }
     42  return true;
     43 }
     44 
     45 /* static */
     46 nsTArray<UniquePtr<TrackInfo>> OggDecoder::GetTracksInfo(
     47    const MediaContainerType& aType) {
     48  nsTArray<UniquePtr<TrackInfo>> tracks;
     49  if (!IsSupportedType(aType)) {
     50    return tracks;
     51  }
     52 
     53  const MediaCodecs& codecs = aType.ExtendedType().Codecs();
     54  if (codecs.IsEmpty()) {
     55    // Codecs must be specified for ogg as it can't be implied.
     56    return tracks;
     57  }
     58 
     59  for (const auto& codec : codecs.Range()) {
     60    if (codec.EqualsLiteral("opus") || codec.EqualsLiteral("vorbis") ||
     61        codec.EqualsLiteral("flac")) {
     62      tracks.AppendElement(
     63          CreateTrackInfoWithMIMETypeAndContainerTypeExtraParameters(
     64              "audio/"_ns + NS_ConvertUTF16toUTF8(codec), aType));
     65    }
     66  }
     67  return tracks;
     68 }
     69 
     70 }  // namespace mozilla