content/media/wmf/WMFDecoder.cpp@97036ab72558 (annotated)
content/media/wmf/WMFDecoder.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* vim:set ts=2 sw=2 sts=2 et cindent: */ |
| michael@0 | 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #include "WMF.h" |
| michael@0 | 8 | #include "WMFDecoder.h" |
| michael@0 | 9 | #include "WMFReader.h" |
| michael@0 | 10 | #include "WMFUtils.h" |
| michael@0 | 11 | #include "MediaDecoderStateMachine.h" |
| michael@0 | 12 | #include "mozilla/Preferences.h" |
| michael@0 | 13 | #include "mozilla/WindowsVersion.h" |
| michael@0 | 14 | #include "nsCharSeparatedTokenizer.h" |
| michael@0 | 15 | |
| michael@0 | 16 | #ifdef MOZ_DIRECTSHOW |
| michael@0 | 17 | #include "DirectShowDecoder.h" |
| michael@0 | 18 | #endif |
| michael@0 | 19 | |
| michael@0 | 20 | namespace mozilla { |
| michael@0 | 21 | |
| michael@0 | 22 | MediaDecoderStateMachine* WMFDecoder::CreateStateMachine() |
| michael@0 | 23 | { |
| michael@0 | 24 | return new MediaDecoderStateMachine(this, new WMFReader(this)); |
| michael@0 | 25 | } |
| michael@0 | 26 | |
| michael@0 | 27 | /* static */ |
| michael@0 | 28 | bool |
| michael@0 | 29 | WMFDecoder::IsMP3Supported() |
| michael@0 | 30 | { |
| michael@0 | 31 | MOZ_ASSERT(NS_IsMainThread(), "Must be on main thread."); |
| michael@0 | 32 | if (!MediaDecoder::IsWMFEnabled()) { |
| michael@0 | 33 | return false; |
| michael@0 | 34 | } |
| michael@0 | 35 | // MP3 works fine in WMF on Windows Vista and Windows 8. |
| michael@0 | 36 | if (!IsWin7OrLater()) { |
| michael@0 | 37 | return true; |
| michael@0 | 38 | } |
| michael@0 | 39 | // MP3 support is disabled if we're on Windows 7 and no service packs are |
| michael@0 | 40 | // installed, since it's crashy. Win7 with service packs is not so crashy, |
| michael@0 | 41 | // so we enable it there. Note we prefer DirectShow for MP3 playback, but |
| michael@0 | 42 | // we still support MP3 in MP4 via WMF, or MP3 in WMF if DirectShow is |
| michael@0 | 43 | // disabled. |
| michael@0 | 44 | return IsWin7SP1OrLater(); |
| michael@0 | 45 | } |
| michael@0 | 46 | |
| michael@0 | 47 | static bool |
| michael@0 | 48 | IsSupportedH264Codec(const nsAString& aCodec) |
| michael@0 | 49 | { |
| michael@0 | 50 | // According to the WMF documentation: |
| michael@0 | 51 | // http://msdn.microsoft.com/en-us/library/windows/desktop/dd797815%28v=vs.85%29.aspx |
| michael@0 | 52 | // "The Media Foundation H.264 video decoder is a Media Foundation Transform |
| michael@0 | 53 | // that supports decoding of Baseline, Main, and High profiles, up to level |
| michael@0 | 54 | // 5.1.". We also report that we can play Extended profile, as there are |
| michael@0 | 55 | // bitstreams that are Extended compliant that are also Baseline compliant. |
| michael@0 | 56 | |
| michael@0 | 57 | // H.264 codecs parameters have a type defined as avc1.PPCCLL, where |
| michael@0 | 58 | // PP = profile_idc, CC = constraint_set flags, LL = level_idc. |
| michael@0 | 59 | // We ignore the constraint_set flags, as it's not clear from the WMF |
| michael@0 | 60 | // documentation what constraints the WMF H.264 decoder supports. |
| michael@0 | 61 | // See http://blog.pearce.org.nz/2013/11/what-does-h264avc1-codecs-parameters.html |
| michael@0 | 62 | // for more details. |
| michael@0 | 63 | if (aCodec.Length() != strlen("avc1.PPCCLL")) { |
| michael@0 | 64 | return false; |
| michael@0 | 65 | } |
| michael@0 | 66 | |
| michael@0 | 67 | // Verify the codec starts with "avc1.". |
| michael@0 | 68 | const nsAString& sample = Substring(aCodec, 0, 5); |
| michael@0 | 69 | if (!sample.EqualsASCII("avc1.")) { |
| michael@0 | 70 | return false; |
| michael@0 | 71 | } |
| michael@0 | 72 | |
| michael@0 | 73 | // Extract the profile_idc and level_idc. Note: the constraint_set flags |
| michael@0 | 74 | // are ignored, it's not clear from the WMF documentation if they make a |
| michael@0 | 75 | // difference. |
| michael@0 | 76 | nsresult rv = NS_OK; |
| michael@0 | 77 | const int32_t profile = PromiseFlatString(Substring(aCodec, 5, 2)).ToInteger(&rv, 16); |
| michael@0 | 78 | NS_ENSURE_SUCCESS(rv, false); |
| michael@0 | 79 | |
| michael@0 | 80 | const int32_t level = PromiseFlatString(Substring(aCodec, 9, 2)).ToInteger(&rv, 16); |
| michael@0 | 81 | NS_ENSURE_SUCCESS(rv, false); |
| michael@0 | 82 | |
| michael@0 | 83 | return level >= eAVEncH264VLevel1 && |
| michael@0 | 84 | level <= eAVEncH264VLevel5_1 && |
| michael@0 | 85 | (profile == eAVEncH264VProfile_Base || |
| michael@0 | 86 | profile == eAVEncH264VProfile_Main || |
| michael@0 | 87 | profile == eAVEncH264VProfile_Extended || |
| michael@0 | 88 | profile == eAVEncH264VProfile_High); |
| michael@0 | 89 | } |
| michael@0 | 90 | |
| michael@0 | 91 | bool |
| michael@0 | 92 | WMFDecoder::CanPlayType(const nsACString& aType, |
| michael@0 | 93 | const nsAString& aCodecs) |
| michael@0 | 94 | { |
| michael@0 | 95 | if (!MediaDecoder::IsWMFEnabled() || |
| michael@0 | 96 | NS_FAILED(LoadDLLs())) { |
| michael@0 | 97 | return false; |
| michael@0 | 98 | } |
| michael@0 | 99 | |
| michael@0 | 100 | // Assume that if LoadDLLs() didn't fail, we can playback the types that |
| michael@0 | 101 | // we know should be supported by Windows Media Foundation. |
| michael@0 | 102 | if ((aType.EqualsASCII("audio/mpeg") || aType.EqualsASCII("audio/mp3")) && |
| michael@0 | 103 | IsMP3Supported()) { |
| michael@0 | 104 | // Note: We block MP3 playback on Window 7 SP0 since it seems to crash |
| michael@0 | 105 | // in some circumstances. |
| michael@0 | 106 | return !aCodecs.Length() || aCodecs.EqualsASCII("mp3"); |
| michael@0 | 107 | } |
| michael@0 | 108 | |
| michael@0 | 109 | // AAC-LC or MP3 in M4A. |
| michael@0 | 110 | if (aType.EqualsASCII("audio/mp4") || aType.EqualsASCII("audio/x-m4a")) { |
| michael@0 | 111 | return !aCodecs.Length() || |
| michael@0 | 112 | aCodecs.EqualsASCII("mp4a.40.2") || |
| michael@0 | 113 | aCodecs.EqualsASCII("mp3"); |
| michael@0 | 114 | } |
| michael@0 | 115 | |
| michael@0 | 116 | if (!aType.EqualsASCII("video/mp4")) { |
| michael@0 | 117 | return false; |
| michael@0 | 118 | } |
| michael@0 | 119 | |
| michael@0 | 120 | // H.264 + AAC in MP4. Verify that all the codecs specifed are ones that |
| michael@0 | 121 | // we expect that we can play. |
| michael@0 | 122 | nsCharSeparatedTokenizer tokenizer(aCodecs, ','); |
| michael@0 | 123 | bool expectMoreTokens = false; |
| michael@0 | 124 | while (tokenizer.hasMoreTokens()) { |
| michael@0 | 125 | const nsSubstring& token = tokenizer.nextToken(); |
| michael@0 | 126 | expectMoreTokens = tokenizer.separatorAfterCurrentToken(); |
| michael@0 | 127 | if (token.EqualsASCII("mp4a.40.2") || // AAC-LC |
| michael@0 | 128 | token.EqualsASCII("mp3") || |
| michael@0 | 129 | IsSupportedH264Codec(token)) { |
| michael@0 | 130 | continue; |
| michael@0 | 131 | } |
| michael@0 | 132 | return false; |
| michael@0 | 133 | } |
| michael@0 | 134 | if (expectMoreTokens) { |
| michael@0 | 135 | // Last codec name was empty |
| michael@0 | 136 | return false; |
| michael@0 | 137 | } |
| michael@0 | 138 | return true; |
| michael@0 | 139 | } |
| michael@0 | 140 | |
| michael@0 | 141 | nsresult |
| michael@0 | 142 | WMFDecoder::LoadDLLs() |
| michael@0 | 143 | { |
| michael@0 | 144 | return SUCCEEDED(wmf::LoadDLLs()) ? NS_OK : NS_ERROR_FAILURE; |
| michael@0 | 145 | } |
| michael@0 | 146 | |
| michael@0 | 147 | void |
| michael@0 | 148 | WMFDecoder::UnloadDLLs() |
| michael@0 | 149 | { |
| michael@0 | 150 | wmf::UnloadDLLs(); |
| michael@0 | 151 | } |
| michael@0 | 152 | |
| michael@0 | 153 | /* static */ |
| michael@0 | 154 | bool |
| michael@0 | 155 | WMFDecoder::IsEnabled() |
| michael@0 | 156 | { |
| michael@0 | 157 | // We only use WMF on Windows Vista and up |
| michael@0 | 158 | return IsVistaOrLater() && |
| michael@0 | 159 | Preferences::GetBool("media.windows-media-foundation.enabled"); |
| michael@0 | 160 | } |
| michael@0 | 161 | |
| michael@0 | 162 | } // namespace mozilla |
| michael@0 | 163 |
