gecko/content/media/wmf/WMFDecoder.cpp

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/* -*- 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 "WMF.h"
#include "WMFDecoder.h"
#include "WMFReader.h"
#include "WMFUtils.h"
#include "MediaDecoderStateMachine.h"
#include "mozilla/Preferences.h"
#include "WinUtils.h"
#ifdef MOZ_DIRECTSHOW
#include "DirectShowDecoder.h"
#endif
using namespace mozilla::widget;
namespace mozilla {
MediaDecoderStateMachine* WMFDecoder::CreateStateMachine()
{
return new MediaDecoderStateMachine(this, new WMFReader(this));
}
/* static */
bool
WMFDecoder::IsMP3Supported()
{
MOZ_ASSERT(NS_IsMainThread(), "Must be on main thread.");
#ifdef MOZ_DIRECTSHOW
if (DirectShowDecoder::IsEnabled()) {
// DirectShowDecoder is enabled, we use that in preference to the WMF
// backend.
return false;
}
#endif
if (!MediaDecoder::IsWMFEnabled()) {
return false;
}
if (WinUtils::GetWindowsVersion() != WinUtils::WIN7_VERSION) {
return true;
}
// We're on Windows 7. MP3 support is disabled if no service pack
// is installed, as it's crashy on Win7 SP0.
UINT spMajorVer = 0, spMinorVer = 0;
if (!WinUtils::GetWindowsServicePackVersion(spMajorVer, spMinorVer)) {
// Um... We can't determine the service pack version... Just block
// MP3 as a precaution...
return false;
}
return spMajorVer != 0;
}
bool
WMFDecoder::GetSupportedCodecs(const nsACString& aType,
char const *const ** aCodecList)
{
if (!MediaDecoder::IsWMFEnabled() ||
NS_FAILED(LoadDLLs()))
return false;
// Assume that if LoadDLLs() didn't fail, we can playback the types that
// we know should be supported by Windows Media Foundation.
static char const *const mp3AudioCodecs[] = {
"mp3",
nullptr
};
if ((aType.EqualsASCII("audio/mpeg") || aType.EqualsASCII("audio/mp3")) &&
IsMP3Supported()) {
// Note: We block MP3 playback on Window 7 SP0 since it seems to crash
// in some circumstances.
if (aCodecList) {
*aCodecList = mp3AudioCodecs;
}
return true;
}
// AAC in M4A.
static char const *const aacAudioCodecs[] = {
"mp4a.40.2", // AAC-LC
nullptr
};
if (aType.EqualsASCII("audio/mp4") ||
aType.EqualsASCII("audio/x-m4a")) {
if (aCodecList) {
*aCodecList = aacAudioCodecs;
}
return true;
}
// H.264 + AAC in MP4.
static char const *const H264Codecs[] = {
"avc1.42E01E", // H.264 Constrained Baseline Profile Level 3.0
"avc1.42001E", // H.264 Baseline Profile Level 3.0
"avc1.58A01E", // H.264 Extended Profile Level 3.0
"avc1.4D401E", // H.264 Main Profile Level 3.0
"avc1.64001E", // H.264 High Profile Level 3.0
"avc1.64001F", // H.264 High Profile Level 3.1
"mp4a.40.2", // AAC-LC
nullptr
};
if (aType.EqualsASCII("video/mp4")) {
if (aCodecList) {
*aCodecList = H264Codecs;
}
return true;
}
return false;
}
nsresult
WMFDecoder::LoadDLLs()
{
return SUCCEEDED(wmf::LoadDLLs()) ? NS_OK : NS_ERROR_FAILURE;
}
void
WMFDecoder::UnloadDLLs()
{
wmf::UnloadDLLs();
}
/* static */
bool
WMFDecoder::IsEnabled()
{
// We only use WMF on Windows Vista and up
return WinUtils::GetWindowsVersion() >= WinUtils::VISTA_VERSION &&
Preferences::GetBool("media.windows-media-foundation.enabled");
}
} // namespace mozilla