1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/fmp4/MP4Decoder.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,108 @@
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 "MP4Decoder.h"
1.11 +#include "MP4Reader.h"
1.12 +#include "MediaDecoderStateMachine.h"
1.13 +#include "mozilla/Preferences.h"
1.14 +
1.15 +#ifdef XP_WIN
1.16 +#include "mozilla/WindowsVersion.h"
1.17 +#endif
1.18 +#ifdef MOZ_FFMPEG
1.19 +#include "FFmpegDecoderModule.h"
1.20 +#endif
1.21 +
1.22 +namespace mozilla {
1.23 +
1.24 +MediaDecoderStateMachine* MP4Decoder::CreateStateMachine()
1.25 +{
1.26 + return new MediaDecoderStateMachine(this, new MP4Reader(this));
1.27 +}
1.28 +
1.29 +bool
1.30 +MP4Decoder::GetSupportedCodecs(const nsACString& aType,
1.31 + char const *const ** aCodecList)
1.32 +{
1.33 + if (!IsEnabled()) {
1.34 + return false;
1.35 + }
1.36 +
1.37 + // AAC in M4A.
1.38 + static char const *const aacAudioCodecs[] = {
1.39 + "mp4a.40.2", // AAC-LC
1.40 + // TODO: AAC-HE ?
1.41 + nullptr
1.42 + };
1.43 + if (aType.EqualsASCII("audio/mp4") ||
1.44 + aType.EqualsASCII("audio/x-m4a")) {
1.45 + if (aCodecList) {
1.46 + *aCodecList = aacAudioCodecs;
1.47 + }
1.48 + return true;
1.49 + }
1.50 +
1.51 + // H.264 + AAC in MP4.
1.52 + static char const *const h264Codecs[] = {
1.53 + "avc1.42E01E", // H.264 Constrained Baseline Profile Level 3.0
1.54 + "avc1.42001E", // H.264 Baseline Profile Level 3.0
1.55 + "avc1.58A01E", // H.264 Extended Profile Level 3.0
1.56 + "avc1.4D401E", // H.264 Main Profile Level 3.0
1.57 + "avc1.64001E", // H.264 High Profile Level 3.0
1.58 + "avc1.64001F", // H.264 High Profile Level 3.1
1.59 + "mp4a.40.2", // AAC-LC
1.60 + // TODO: There must be more profiles here?
1.61 + nullptr
1.62 + };
1.63 + if (aType.EqualsASCII("video/mp4")) {
1.64 + if (aCodecList) {
1.65 + *aCodecList = h264Codecs;
1.66 + }
1.67 + return true;
1.68 + }
1.69 +
1.70 + return false;
1.71 +}
1.72 +
1.73 +static bool
1.74 +IsFFmpegAvailable()
1.75 +{
1.76 +#ifndef MOZ_FFMPEG
1.77 + return false;
1.78 +#else
1.79 + if (!Preferences::GetBool("media.fragmented-mp4.ffmpeg.enabled", false)) {
1.80 + return false;
1.81 + }
1.82 +
1.83 + // If we can link to FFmpeg, then we can almost certainly play H264 and AAC
1.84 + // with it.
1.85 + return FFmpegDecoderModule::Link();
1.86 +#endif
1.87 +}
1.88 +
1.89 +static bool
1.90 +HavePlatformMPEGDecoders()
1.91 +{
1.92 + return Preferences::GetBool("media.fragmented-mp4.use-blank-decoder") ||
1.93 +#ifdef XP_WIN
1.94 + // We have H.264/AAC platform decoders on Windows Vista and up.
1.95 + IsVistaOrLater() ||
1.96 +#endif
1.97 + IsFFmpegAvailable() ||
1.98 + // TODO: Other platforms...
1.99 + false;
1.100 +}
1.101 +
1.102 +/* static */
1.103 +bool
1.104 +MP4Decoder::IsEnabled()
1.105 +{
1.106 + return HavePlatformMPEGDecoders() &&
1.107 + Preferences::GetBool("media.fragmented-mp4.enabled");
1.108 +}
1.109 +
1.110 +} // namespace mozilla
1.111 +
