1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/wmf/WMFDecoder.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,163 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim:set ts=2 sw=2 sts=2 et cindent: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "WMF.h"
1.11 +#include "WMFDecoder.h"
1.12 +#include "WMFReader.h"
1.13 +#include "WMFUtils.h"
1.14 +#include "MediaDecoderStateMachine.h"
1.15 +#include "mozilla/Preferences.h"
1.16 +#include "mozilla/WindowsVersion.h"
1.17 +#include "nsCharSeparatedTokenizer.h"
1.18 +
1.19 +#ifdef MOZ_DIRECTSHOW
1.20 +#include "DirectShowDecoder.h"
1.21 +#endif
1.22 +
1.23 +namespace mozilla {
1.24 +
1.25 +MediaDecoderStateMachine* WMFDecoder::CreateStateMachine()
1.26 +{
1.27 + return new MediaDecoderStateMachine(this, new WMFReader(this));
1.28 +}
1.29 +
1.30 +/* static */
1.31 +bool
1.32 +WMFDecoder::IsMP3Supported()
1.33 +{
1.34 + MOZ_ASSERT(NS_IsMainThread(), "Must be on main thread.");
1.35 + if (!MediaDecoder::IsWMFEnabled()) {
1.36 + return false;
1.37 + }
1.38 + // MP3 works fine in WMF on Windows Vista and Windows 8.
1.39 + if (!IsWin7OrLater()) {
1.40 + return true;
1.41 + }
1.42 + // MP3 support is disabled if we're on Windows 7 and no service packs are
1.43 + // installed, since it's crashy. Win7 with service packs is not so crashy,
1.44 + // so we enable it there. Note we prefer DirectShow for MP3 playback, but
1.45 + // we still support MP3 in MP4 via WMF, or MP3 in WMF if DirectShow is
1.46 + // disabled.
1.47 + return IsWin7SP1OrLater();
1.48 +}
1.49 +
1.50 +static bool
1.51 +IsSupportedH264Codec(const nsAString& aCodec)
1.52 +{
1.53 + // According to the WMF documentation:
1.54 + // http://msdn.microsoft.com/en-us/library/windows/desktop/dd797815%28v=vs.85%29.aspx
1.55 + // "The Media Foundation H.264 video decoder is a Media Foundation Transform
1.56 + // that supports decoding of Baseline, Main, and High profiles, up to level
1.57 + // 5.1.". We also report that we can play Extended profile, as there are
1.58 + // bitstreams that are Extended compliant that are also Baseline compliant.
1.59 +
1.60 + // H.264 codecs parameters have a type defined as avc1.PPCCLL, where
1.61 + // PP = profile_idc, CC = constraint_set flags, LL = level_idc.
1.62 + // We ignore the constraint_set flags, as it's not clear from the WMF
1.63 + // documentation what constraints the WMF H.264 decoder supports.
1.64 + // See http://blog.pearce.org.nz/2013/11/what-does-h264avc1-codecs-parameters.html
1.65 + // for more details.
1.66 + if (aCodec.Length() != strlen("avc1.PPCCLL")) {
1.67 + return false;
1.68 + }
1.69 +
1.70 + // Verify the codec starts with "avc1.".
1.71 + const nsAString& sample = Substring(aCodec, 0, 5);
1.72 + if (!sample.EqualsASCII("avc1.")) {
1.73 + return false;
1.74 + }
1.75 +
1.76 + // Extract the profile_idc and level_idc. Note: the constraint_set flags
1.77 + // are ignored, it's not clear from the WMF documentation if they make a
1.78 + // difference.
1.79 + nsresult rv = NS_OK;
1.80 + const int32_t profile = PromiseFlatString(Substring(aCodec, 5, 2)).ToInteger(&rv, 16);
1.81 + NS_ENSURE_SUCCESS(rv, false);
1.82 +
1.83 + const int32_t level = PromiseFlatString(Substring(aCodec, 9, 2)).ToInteger(&rv, 16);
1.84 + NS_ENSURE_SUCCESS(rv, false);
1.85 +
1.86 + return level >= eAVEncH264VLevel1 &&
1.87 + level <= eAVEncH264VLevel5_1 &&
1.88 + (profile == eAVEncH264VProfile_Base ||
1.89 + profile == eAVEncH264VProfile_Main ||
1.90 + profile == eAVEncH264VProfile_Extended ||
1.91 + profile == eAVEncH264VProfile_High);
1.92 +}
1.93 +
1.94 +bool
1.95 +WMFDecoder::CanPlayType(const nsACString& aType,
1.96 + const nsAString& aCodecs)
1.97 +{
1.98 + if (!MediaDecoder::IsWMFEnabled() ||
1.99 + NS_FAILED(LoadDLLs())) {
1.100 + return false;
1.101 + }
1.102 +
1.103 + // Assume that if LoadDLLs() didn't fail, we can playback the types that
1.104 + // we know should be supported by Windows Media Foundation.
1.105 + if ((aType.EqualsASCII("audio/mpeg") || aType.EqualsASCII("audio/mp3")) &&
1.106 + IsMP3Supported()) {
1.107 + // Note: We block MP3 playback on Window 7 SP0 since it seems to crash
1.108 + // in some circumstances.
1.109 + return !aCodecs.Length() || aCodecs.EqualsASCII("mp3");
1.110 + }
1.111 +
1.112 + // AAC-LC or MP3 in M4A.
1.113 + if (aType.EqualsASCII("audio/mp4") || aType.EqualsASCII("audio/x-m4a")) {
1.114 + return !aCodecs.Length() ||
1.115 + aCodecs.EqualsASCII("mp4a.40.2") ||
1.116 + aCodecs.EqualsASCII("mp3");
1.117 + }
1.118 +
1.119 + if (!aType.EqualsASCII("video/mp4")) {
1.120 + return false;
1.121 + }
1.122 +
1.123 + // H.264 + AAC in MP4. Verify that all the codecs specifed are ones that
1.124 + // we expect that we can play.
1.125 + nsCharSeparatedTokenizer tokenizer(aCodecs, ',');
1.126 + bool expectMoreTokens = false;
1.127 + while (tokenizer.hasMoreTokens()) {
1.128 + const nsSubstring& token = tokenizer.nextToken();
1.129 + expectMoreTokens = tokenizer.separatorAfterCurrentToken();
1.130 + if (token.EqualsASCII("mp4a.40.2") || // AAC-LC
1.131 + token.EqualsASCII("mp3") ||
1.132 + IsSupportedH264Codec(token)) {
1.133 + continue;
1.134 + }
1.135 + return false;
1.136 + }
1.137 + if (expectMoreTokens) {
1.138 + // Last codec name was empty
1.139 + return false;
1.140 + }
1.141 + return true;
1.142 +}
1.143 +
1.144 +nsresult
1.145 +WMFDecoder::LoadDLLs()
1.146 +{
1.147 + return SUCCEEDED(wmf::LoadDLLs()) ? NS_OK : NS_ERROR_FAILURE;
1.148 +}
1.149 +
1.150 +void
1.151 +WMFDecoder::UnloadDLLs()
1.152 +{
1.153 + wmf::UnloadDLLs();
1.154 +}
1.155 +
1.156 +/* static */
1.157 +bool
1.158 +WMFDecoder::IsEnabled()
1.159 +{
1.160 + // We only use WMF on Windows Vista and up
1.161 + return IsVistaOrLater() &&
1.162 + Preferences::GetBool("media.windows-media-foundation.enabled");
1.163 +}
1.164 +
1.165 +} // namespace mozilla
1.166 +
