The Tor Browser: content/media/fmp4/MP4Decoder.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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/. */

     7 #include "MP4Decoder.h"

     8 #include "MP4Reader.h"

     9 #include "MediaDecoderStateMachine.h"

    10 #include "mozilla/Preferences.h"

    12 #ifdef XP_WIN

    13 #include "mozilla/WindowsVersion.h"

    14 #endif

    15 #ifdef MOZ_FFMPEG

    16 #include "FFmpegDecoderModule.h"

    17 #endif

    19 namespace mozilla {

    21 MediaDecoderStateMachine* MP4Decoder::CreateStateMachine()

    22 {

    23   return new MediaDecoderStateMachine(this, new MP4Reader(this));

    24 }

    26 bool

    27 MP4Decoder::GetSupportedCodecs(const nsACString& aType,

    28                                char const *const ** aCodecList)

    29 {

    30   if (!IsEnabled()) {

    31     return false;

    32   }

    34   // AAC in M4A.

    35   static char const *const aacAudioCodecs[] = {

    36     "mp4a.40.2",    // AAC-LC

    37     // TODO: AAC-HE ?

    38     nullptr

    39   };

    40   if (aType.EqualsASCII("audio/mp4") ||

    41       aType.EqualsASCII("audio/x-m4a")) {

    42     if (aCodecList) {

    43       *aCodecList = aacAudioCodecs;

    44     }

    45     return true;

    46   }

    48   // H.264 + AAC in MP4.

    49   static char const *const h264Codecs[] = {

    50     "avc1.42E01E",  // H.264 Constrained Baseline Profile Level 3.0

    51     "avc1.42001E",  // H.264 Baseline Profile Level 3.0

    52     "avc1.58A01E",  // H.264 Extended Profile Level 3.0

    53     "avc1.4D401E",  // H.264 Main Profile Level 3.0

    54     "avc1.64001E",  // H.264 High Profile Level 3.0

    55     "avc1.64001F",  // H.264 High Profile Level 3.1

    56     "mp4a.40.2",    // AAC-LC

    57     // TODO: There must be more profiles here?

    58     nullptr

    59   };

    60   if (aType.EqualsASCII("video/mp4")) {

    61     if (aCodecList) {

    62       *aCodecList = h264Codecs;

    63     }

    64     return true;

    65   }

    67   return false;

    68 }

    70 static bool

    71 IsFFmpegAvailable()

    72 {

    73 #ifndef MOZ_FFMPEG

    74   return false;

    75 #else

    76   if (!Preferences::GetBool("media.fragmented-mp4.ffmpeg.enabled", false)) {

    77     return false;

    78   }

    80   // If we can link to FFmpeg, then we can almost certainly play H264 and AAC

    81   // with it.

    82   return FFmpegDecoderModule::Link();

    83 #endif

    84 }

    86 static bool

    87 HavePlatformMPEGDecoders()

    88 {

    89   return Preferences::GetBool("media.fragmented-mp4.use-blank-decoder") ||

    90 #ifdef XP_WIN

    91          // We have H.264/AAC platform decoders on Windows Vista and up.

    92          IsVistaOrLater() ||

    93 #endif

    94          IsFFmpegAvailable() ||

    95          // TODO: Other platforms...

    96          false;

    97 }

    99 /* static */

   100 bool

   101 MP4Decoder::IsEnabled()

   102 {

   103   return HavePlatformMPEGDecoders() &&

   104          Preferences::GetBool("media.fragmented-mp4.enabled");

   105 }

   107 } // namespace mozilla

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