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-rw-r--r--dom/media/mp3/MP3Decoder.cpp50
-rw-r--r--dom/media/mp3/MP3Decoder.h29
-rw-r--r--dom/media/mp3/MP3Demuxer.cpp1340
-rw-r--r--dom/media/mp3/MP3Demuxer.h472
-rw-r--r--dom/media/mp3/moz.build17
5 files changed, 1908 insertions, 0 deletions
diff --git a/dom/media/mp3/MP3Decoder.cpp b/dom/media/mp3/MP3Decoder.cpp
new file mode 100644
index 000000000..074a0866d
--- /dev/null
+++ b/dom/media/mp3/MP3Decoder.cpp
@@ -0,0 +1,50 @@
+
+/* -*- 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 "MP3Decoder.h"
+#include "MediaDecoderStateMachine.h"
+#include "MediaFormatReader.h"
+#include "MP3Demuxer.h"
+#include "PDMFactory.h"
+
+namespace mozilla {
+
+MediaDecoder*
+MP3Decoder::Clone(MediaDecoderOwner* aOwner) {
+ if (!IsEnabled()) {
+ return nullptr;
+ }
+ return new MP3Decoder(aOwner);
+}
+
+MediaDecoderStateMachine*
+MP3Decoder::CreateStateMachine() {
+ RefPtr<MediaDecoderReader> reader =
+ new MediaFormatReader(this, new MP3Demuxer(GetResource()));
+ return new MediaDecoderStateMachine(this, reader);
+}
+
+/* static */
+bool
+MP3Decoder::IsEnabled() {
+ RefPtr<PDMFactory> platform = new PDMFactory();
+ return platform->SupportsMimeType(NS_LITERAL_CSTRING("audio/mpeg"),
+ /* DecoderDoctorDiagnostics* */ nullptr);
+}
+
+/* static */
+bool MP3Decoder::CanHandleMediaType(const nsACString& aType,
+ const nsAString& aCodecs)
+{
+ if (aType.EqualsASCII("audio/mp3") || aType.EqualsASCII("audio/mpeg")) {
+ return IsEnabled() &&
+ (aCodecs.IsEmpty() || aCodecs.EqualsASCII("mp3"));
+ }
+ return false;
+}
+
+} // namespace mozilla
diff --git a/dom/media/mp3/MP3Decoder.h b/dom/media/mp3/MP3Decoder.h
new file mode 100644
index 000000000..887251065
--- /dev/null
+++ b/dom/media/mp3/MP3Decoder.h
@@ -0,0 +1,29 @@
+/* -*- 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/. */
+#ifndef MP3Decoder_h_
+#define MP3Decoder_h_
+
+#include "MediaDecoder.h"
+
+namespace mozilla {
+
+class MP3Decoder : public MediaDecoder {
+public:
+ // MediaDecoder interface.
+ explicit MP3Decoder(MediaDecoderOwner* aOwner) : MediaDecoder(aOwner) {}
+ MediaDecoder* Clone(MediaDecoderOwner* aOwner) override;
+ MediaDecoderStateMachine* CreateStateMachine() override;
+
+ // Returns true if the MP3 backend is preffed on, and we're running on a
+ // platform that is likely to have decoders for the format.
+ static bool IsEnabled();
+ static bool CanHandleMediaType(const nsACString& aType,
+ const nsAString& aCodecs);
+};
+
+} // namespace mozilla
+
+#endif
diff --git a/dom/media/mp3/MP3Demuxer.cpp b/dom/media/mp3/MP3Demuxer.cpp
new file mode 100644
index 000000000..5a98cabfe
--- /dev/null
+++ b/dom/media/mp3/MP3Demuxer.cpp
@@ -0,0 +1,1340 @@
+/* -*- 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 "MP3Demuxer.h"
+
+#include <inttypes.h>
+#include <algorithm>
+
+#include "mozilla/Assertions.h"
+#include "mozilla/EndianUtils.h"
+#include "nsAutoPtr.h"
+#include "VideoUtils.h"
+#include "TimeUnits.h"
+#include "prenv.h"
+
+#ifdef PR_LOGGING
+extern mozilla::LazyLogModule gMediaDemuxerLog;
+#define MP3LOG(msg, ...) \
+ MOZ_LOG(gMediaDemuxerLog, LogLevel::Debug, ("MP3Demuxer " msg, ##__VA_ARGS__))
+#define MP3LOGV(msg, ...) \
+ MOZ_LOG(gMediaDemuxerLog, LogLevel::Verbose, ("MP3Demuxer " msg, ##__VA_ARGS__))
+#else
+#define MP3LOG(msg, ...)
+#define MP3LOGV(msg, ...)
+#endif
+
+using mozilla::media::TimeUnit;
+using mozilla::media::TimeInterval;
+using mozilla::media::TimeIntervals;
+using mp4_demuxer::ByteReader;
+
+namespace mozilla {
+
+// MP3Demuxer
+
+MP3Demuxer::MP3Demuxer(MediaResource* aSource)
+ : mSource(aSource)
+{}
+
+bool
+MP3Demuxer::InitInternal() {
+ if (!mTrackDemuxer) {
+ mTrackDemuxer = new MP3TrackDemuxer(mSource);
+ }
+ return mTrackDemuxer->Init();
+}
+
+RefPtr<MP3Demuxer::InitPromise>
+MP3Demuxer::Init() {
+ if (!InitInternal()) {
+ MP3LOG("MP3Demuxer::Init() failure: waiting for data");
+
+ return InitPromise::CreateAndReject(
+ NS_ERROR_DOM_MEDIA_METADATA_ERR, __func__);
+ }
+
+ MP3LOG("MP3Demuxer::Init() successful");
+ return InitPromise::CreateAndResolve(NS_OK, __func__);
+}
+
+bool
+MP3Demuxer::HasTrackType(TrackInfo::TrackType aType) const {
+ return aType == TrackInfo::kAudioTrack;
+}
+
+uint32_t
+MP3Demuxer::GetNumberTracks(TrackInfo::TrackType aType) const {
+ return aType == TrackInfo::kAudioTrack ? 1u : 0u;
+}
+
+already_AddRefed<MediaTrackDemuxer>
+MP3Demuxer::GetTrackDemuxer(TrackInfo::TrackType aType, uint32_t aTrackNumber) {
+ if (!mTrackDemuxer) {
+ return nullptr;
+ }
+ return RefPtr<MP3TrackDemuxer>(mTrackDemuxer).forget();
+}
+
+bool
+MP3Demuxer::IsSeekable() const {
+ return true;
+}
+
+void
+MP3Demuxer::NotifyDataArrived() {
+ // TODO: bug 1169485.
+ NS_WARNING("Unimplemented function NotifyDataArrived");
+ MP3LOGV("NotifyDataArrived()");
+}
+
+void
+MP3Demuxer::NotifyDataRemoved() {
+ // TODO: bug 1169485.
+ NS_WARNING("Unimplemented function NotifyDataRemoved");
+ MP3LOGV("NotifyDataRemoved()");
+}
+
+
+// MP3TrackDemuxer
+
+MP3TrackDemuxer::MP3TrackDemuxer(MediaResource* aSource)
+ : mSource(aSource)
+ , mOffset(0)
+ , mFirstFrameOffset(0)
+ , mNumParsedFrames(0)
+ , mFrameIndex(0)
+ , mTotalFrameLen(0)
+ , mSamplesPerFrame(0)
+ , mSamplesPerSecond(0)
+ , mChannels(0)
+{
+ Reset();
+}
+
+bool
+MP3TrackDemuxer::Init() {
+ Reset();
+ FastSeek(TimeUnit());
+ // Read the first frame to fetch sample rate and other meta data.
+ RefPtr<MediaRawData> frame(GetNextFrame(FindFirstFrame()));
+
+ MP3LOG("Init StreamLength()=%" PRId64 " first-frame-found=%d",
+ StreamLength(), !!frame);
+
+ if (!frame) {
+ return false;
+ }
+
+ // Rewind back to the stream begin to avoid dropping the first frame.
+ FastSeek(TimeUnit());
+
+ if (!mInfo) {
+ mInfo = MakeUnique<AudioInfo>();
+ }
+
+ mInfo->mRate = mSamplesPerSecond;
+ mInfo->mChannels = mChannels;
+ mInfo->mBitDepth = 16;
+ mInfo->mMimeType = "audio/mpeg";
+ mInfo->mDuration = Duration().ToMicroseconds();
+
+ MP3LOG("Init mInfo={mRate=%d mChannels=%d mBitDepth=%d mDuration=%" PRId64 "}",
+ mInfo->mRate, mInfo->mChannels, mInfo->mBitDepth,
+ mInfo->mDuration);
+
+ return mSamplesPerSecond && mChannels;
+}
+
+media::TimeUnit
+MP3TrackDemuxer::SeekPosition() const {
+ TimeUnit pos = Duration(mFrameIndex);
+ if (Duration() > TimeUnit()) {
+ pos = std::min(Duration(), pos);
+ }
+ return pos;
+}
+
+const FrameParser::Frame&
+MP3TrackDemuxer::LastFrame() const {
+ return mParser.PrevFrame();
+}
+
+RefPtr<MediaRawData>
+MP3TrackDemuxer::DemuxSample() {
+ return GetNextFrame(FindNextFrame());
+}
+
+const ID3Parser::ID3Header&
+MP3TrackDemuxer::ID3Header() const {
+ return mParser.ID3Header();
+}
+
+const FrameParser::VBRHeader&
+MP3TrackDemuxer::VBRInfo() const {
+ return mParser.VBRInfo();
+}
+
+UniquePtr<TrackInfo>
+MP3TrackDemuxer::GetInfo() const {
+ return mInfo->Clone();
+}
+
+RefPtr<MP3TrackDemuxer::SeekPromise>
+MP3TrackDemuxer::Seek(TimeUnit aTime) {
+ // Efficiently seek to the position.
+ FastSeek(aTime);
+ // Correct seek position by scanning the next frames.
+ const TimeUnit seekTime = ScanUntil(aTime);
+
+ return SeekPromise::CreateAndResolve(seekTime, __func__);
+}
+
+TimeUnit
+MP3TrackDemuxer::FastSeek(const TimeUnit& aTime) {
+ MP3LOG("FastSeek(%" PRId64 ") avgFrameLen=%f mNumParsedFrames=%" PRIu64
+ " mFrameIndex=%" PRId64 " mOffset=%" PRIu64,
+ aTime.ToMicroseconds(), AverageFrameLength(), mNumParsedFrames,
+ mFrameIndex, mOffset);
+
+ const auto& vbr = mParser.VBRInfo();
+ if (!aTime.ToMicroseconds()) {
+ // Quick seek to the beginning of the stream.
+ mFrameIndex = 0;
+ } else if (vbr.IsTOCPresent() && Duration().ToMicroseconds() > 0) {
+ // Use TOC for more precise seeking.
+ const float durationFrac = static_cast<float>(aTime.ToMicroseconds()) /
+ Duration().ToMicroseconds();
+ mFrameIndex = FrameIndexFromOffset(vbr.Offset(durationFrac));
+ } else if (AverageFrameLength() > 0) {
+ mFrameIndex = FrameIndexFromTime(aTime);
+ }
+
+ mOffset = OffsetFromFrameIndex(mFrameIndex);
+
+ if (mOffset > mFirstFrameOffset && StreamLength() > 0) {
+ mOffset = std::min(StreamLength() - 1, mOffset);
+ }
+
+ mParser.EndFrameSession();
+
+ MP3LOG("FastSeek End TOC=%d avgFrameLen=%f mNumParsedFrames=%" PRIu64
+ " mFrameIndex=%" PRId64 " mFirstFrameOffset=%llu mOffset=%" PRIu64
+ " SL=%llu NumBytes=%u",
+ vbr.IsTOCPresent(), AverageFrameLength(), mNumParsedFrames, mFrameIndex,
+ mFirstFrameOffset, mOffset, StreamLength(), vbr.NumBytes().valueOr(0));
+
+ return Duration(mFrameIndex);
+}
+
+TimeUnit
+MP3TrackDemuxer::ScanUntil(const TimeUnit& aTime) {
+ MP3LOG("ScanUntil(%" PRId64 ") avgFrameLen=%f mNumParsedFrames=%" PRIu64
+ " mFrameIndex=%" PRId64 " mOffset=%" PRIu64,
+ aTime.ToMicroseconds(), AverageFrameLength(), mNumParsedFrames,
+ mFrameIndex, mOffset);
+
+ if (!aTime.ToMicroseconds()) {
+ return FastSeek(aTime);
+ }
+
+ if (Duration(mFrameIndex) > aTime) {
+ FastSeek(aTime);
+ }
+
+ if (Duration(mFrameIndex + 1) > aTime) {
+ return SeekPosition();
+ }
+
+ MediaByteRange nextRange = FindNextFrame();
+ while (SkipNextFrame(nextRange) && Duration(mFrameIndex + 1) < aTime) {
+ nextRange = FindNextFrame();
+ MP3LOGV("ScanUntil* avgFrameLen=%f mNumParsedFrames=%" PRIu64
+ " mFrameIndex=%" PRId64 " mOffset=%" PRIu64 " Duration=%" PRId64,
+ AverageFrameLength(), mNumParsedFrames,
+ mFrameIndex, mOffset, Duration(mFrameIndex + 1).ToMicroseconds());
+ }
+
+ MP3LOG("ScanUntil End avgFrameLen=%f mNumParsedFrames=%" PRIu64
+ " mFrameIndex=%" PRId64 " mOffset=%" PRIu64,
+ AverageFrameLength(), mNumParsedFrames, mFrameIndex, mOffset);
+
+ return SeekPosition();
+}
+
+RefPtr<MP3TrackDemuxer::SamplesPromise>
+MP3TrackDemuxer::GetSamples(int32_t aNumSamples) {
+ MP3LOGV("GetSamples(%d) Begin mOffset=%" PRIu64 " mNumParsedFrames=%" PRIu64
+ " mFrameIndex=%" PRId64 " mTotalFrameLen=%" PRIu64 " mSamplesPerFrame=%d "
+ "mSamplesPerSecond=%d mChannels=%d",
+ aNumSamples, mOffset, mNumParsedFrames, mFrameIndex, mTotalFrameLen,
+ mSamplesPerFrame, mSamplesPerSecond, mChannels);
+
+ if (!aNumSamples) {
+ return SamplesPromise::CreateAndReject(
+ NS_ERROR_DOM_MEDIA_DEMUXER_ERR, __func__);
+ }
+
+ RefPtr<SamplesHolder> frames = new SamplesHolder();
+
+ while (aNumSamples--) {
+ RefPtr<MediaRawData> frame(GetNextFrame(FindNextFrame()));
+ if (!frame) {
+ break;
+ }
+
+ frames->mSamples.AppendElement(frame);
+ }
+
+ MP3LOGV("GetSamples() End mSamples.Size()=%d aNumSamples=%d mOffset=%" PRIu64
+ " mNumParsedFrames=%" PRIu64 " mFrameIndex=%" PRId64
+ " mTotalFrameLen=%" PRIu64 " mSamplesPerFrame=%d mSamplesPerSecond=%d "
+ "mChannels=%d",
+ frames->mSamples.Length(), aNumSamples, mOffset, mNumParsedFrames,
+ mFrameIndex, mTotalFrameLen, mSamplesPerFrame, mSamplesPerSecond,
+ mChannels);
+
+ if (frames->mSamples.IsEmpty()) {
+ return SamplesPromise::CreateAndReject(
+ NS_ERROR_DOM_MEDIA_END_OF_STREAM, __func__);
+ }
+ return SamplesPromise::CreateAndResolve(frames, __func__);
+}
+
+void
+MP3TrackDemuxer::Reset() {
+ MP3LOG("Reset()");
+
+ FastSeek(TimeUnit());
+ mParser.Reset();
+}
+
+RefPtr<MP3TrackDemuxer::SkipAccessPointPromise>
+MP3TrackDemuxer::SkipToNextRandomAccessPoint(TimeUnit aTimeThreshold) {
+ // Will not be called for audio-only resources.
+ return SkipAccessPointPromise::CreateAndReject(
+ SkipFailureHolder(NS_ERROR_DOM_MEDIA_DEMUXER_ERR, 0), __func__);
+}
+
+int64_t
+MP3TrackDemuxer::GetResourceOffset() const {
+ return mOffset;
+}
+
+TimeIntervals
+MP3TrackDemuxer::GetBuffered() {
+ AutoPinned<MediaResource> stream(mSource.GetResource());
+ TimeIntervals buffered;
+
+ if (Duration() > TimeUnit() && stream->IsDataCachedToEndOfResource(0)) {
+ // Special case completely cached files. This also handles local files.
+ buffered += TimeInterval(TimeUnit(), Duration());
+ MP3LOGV("buffered = [[%" PRId64 ", %" PRId64 "]]",
+ TimeUnit().ToMicroseconds(), Duration().ToMicroseconds());
+ return buffered;
+ }
+
+ MediaByteRangeSet ranges;
+ nsresult rv = stream->GetCachedRanges(ranges);
+ NS_ENSURE_SUCCESS(rv, buffered);
+
+ for (const auto& range: ranges) {
+ if (range.IsEmpty()) {
+ continue;
+ }
+ TimeUnit start = Duration(FrameIndexFromOffset(range.mStart));
+ TimeUnit end = Duration(FrameIndexFromOffset(range.mEnd));
+ MP3LOGV("buffered += [%" PRId64 ", %" PRId64 "]",
+ start.ToMicroseconds(), end.ToMicroseconds());
+ buffered += TimeInterval(start, end);
+ }
+
+ return buffered;
+}
+
+int64_t
+MP3TrackDemuxer::StreamLength() const {
+ return mSource.GetLength();
+}
+
+TimeUnit
+MP3TrackDemuxer::Duration() const {
+ if (!mNumParsedFrames) {
+ return TimeUnit::FromMicroseconds(-1);
+ }
+
+ int64_t numFrames = 0;
+ const auto numAudioFrames = mParser.VBRInfo().NumAudioFrames();
+ if (mParser.VBRInfo().IsValid() && numAudioFrames.valueOr(0) + 1 > 1) {
+ // VBR headers don't include the VBR header frame.
+ numFrames = numAudioFrames.value() + 1;
+ } else {
+ const int64_t streamLen = StreamLength();
+ if (streamLen < 0) {
+ // Unknown length, we can't estimate duration.
+ return TimeUnit::FromMicroseconds(-1);
+ }
+ if (AverageFrameLength() > 0) {
+ numFrames = (streamLen - mFirstFrameOffset) / AverageFrameLength();
+ }
+ }
+ return Duration(numFrames);
+}
+
+TimeUnit
+MP3TrackDemuxer::Duration(int64_t aNumFrames) const {
+ if (!mSamplesPerSecond) {
+ return TimeUnit::FromMicroseconds(-1);
+ }
+
+ const double usPerFrame = USECS_PER_S * mSamplesPerFrame / mSamplesPerSecond;
+ return TimeUnit::FromMicroseconds(aNumFrames * usPerFrame);
+}
+
+MediaByteRange
+MP3TrackDemuxer::FindFirstFrame() {
+ static const int MIN_SUCCESSIVE_FRAMES = 4;
+
+ MediaByteRange candidateFrame = FindNextFrame();
+ int numSuccFrames = candidateFrame.Length() > 0;
+ MediaByteRange currentFrame = candidateFrame;
+ MP3LOGV("FindFirst() first candidate frame: mOffset=%" PRIu64 " Length()=%" PRIu64,
+ candidateFrame.mStart, candidateFrame.Length());
+
+ while (candidateFrame.Length() && numSuccFrames < MIN_SUCCESSIVE_FRAMES) {
+ mParser.EndFrameSession();
+ mOffset = currentFrame.mEnd;
+ const MediaByteRange prevFrame = currentFrame;
+
+ // FindNextFrame() here will only return frames consistent with our candidate frame.
+ currentFrame = FindNextFrame();
+ numSuccFrames += currentFrame.Length() > 0;
+ // Multiple successive false positives, which wouldn't be caught by the consistency
+ // checks alone, can be detected by wrong alignment (non-zero gap between frames).
+ const int64_t frameSeparation = currentFrame.mStart - prevFrame.mEnd;
+
+ if (!currentFrame.Length() || frameSeparation != 0) {
+ MP3LOGV("FindFirst() not enough successive frames detected, "
+ "rejecting candidate frame: successiveFrames=%d, last Length()=%" PRIu64
+ ", last frameSeparation=%" PRId64, numSuccFrames, currentFrame.Length(),
+ frameSeparation);
+
+ mParser.ResetFrameData();
+ mOffset = candidateFrame.mStart + 1;
+ candidateFrame = FindNextFrame();
+ numSuccFrames = candidateFrame.Length() > 0;
+ currentFrame = candidateFrame;
+ MP3LOGV("FindFirst() new candidate frame: mOffset=%" PRIu64 " Length()=%" PRIu64,
+ candidateFrame.mStart, candidateFrame.Length());
+ }
+ }
+
+ if (numSuccFrames >= MIN_SUCCESSIVE_FRAMES) {
+ MP3LOG("FindFirst() accepting candidate frame: "
+ "successiveFrames=%d", numSuccFrames);
+ } else {
+ MP3LOG("FindFirst() no suitable first frame found");
+ }
+ return candidateFrame;
+}
+
+static bool
+VerifyFrameConsistency(
+ const FrameParser::Frame& aFrame1, const FrameParser::Frame& aFrame2) {
+ const auto& h1 = aFrame1.Header();
+ const auto& h2 = aFrame2.Header();
+
+ return h1.IsValid() && h2.IsValid() &&
+ h1.Layer() == h2.Layer() &&
+ h1.SlotSize() == h2.SlotSize() &&
+ h1.SamplesPerFrame() == h2.SamplesPerFrame() &&
+ h1.Channels() == h2.Channels() &&
+ h1.SampleRate() == h2.SampleRate() &&
+ h1.RawVersion() == h2.RawVersion() &&
+ h1.RawProtection() == h2.RawProtection();
+}
+
+MediaByteRange
+MP3TrackDemuxer::FindNextFrame() {
+ static const int BUFFER_SIZE = 64;
+ static const int MAX_SKIPPED_BYTES = 1024 * BUFFER_SIZE;
+
+ MP3LOGV("FindNext() Begin mOffset=%" PRIu64 " mNumParsedFrames=%" PRIu64
+ " mFrameIndex=%" PRId64 " mTotalFrameLen=%" PRIu64
+ " mSamplesPerFrame=%d mSamplesPerSecond=%d mChannels=%d",
+ mOffset, mNumParsedFrames, mFrameIndex, mTotalFrameLen,
+ mSamplesPerFrame, mSamplesPerSecond, mChannels);
+
+ uint8_t buffer[BUFFER_SIZE];
+ int32_t read = 0;
+
+ bool foundFrame = false;
+ int64_t frameHeaderOffset = 0;
+
+ // Check whether we've found a valid MPEG frame.
+ while (!foundFrame) {
+ if ((!mParser.FirstFrame().Length() &&
+ mOffset - mParser.ID3Header().Size() > MAX_SKIPPED_BYTES) ||
+ (read = Read(buffer, mOffset, BUFFER_SIZE)) == 0) {
+ MP3LOG("FindNext() EOS or exceeded MAX_SKIPPED_BYTES without a frame");
+ // This is not a valid MPEG audio stream or we've reached EOS, give up.
+ break;
+ }
+
+ ByteReader reader(buffer, read);
+ uint32_t bytesToSkip = 0;
+ foundFrame = mParser.Parse(&reader, &bytesToSkip);
+ frameHeaderOffset = mOffset + reader.Offset() - FrameParser::FrameHeader::SIZE;
+
+ // If we've found neither an MPEG frame header nor an ID3v2 tag,
+ // the reader shouldn't have any bytes remaining.
+ MOZ_ASSERT(foundFrame || bytesToSkip || !reader.Remaining());
+
+ if (foundFrame && mParser.FirstFrame().Length() &&
+ !VerifyFrameConsistency(mParser.FirstFrame(), mParser.CurrentFrame())) {
+ // We've likely hit a false-positive, ignore it and proceed with the
+ // search for the next valid frame.
+ foundFrame = false;
+ mOffset = frameHeaderOffset + 1;
+ mParser.EndFrameSession();
+ } else {
+ // Advance mOffset by the amount of bytes read and if necessary,
+ // skip an ID3v2 tag which stretches beyond the current buffer.
+ NS_ENSURE_TRUE(mOffset + read + bytesToSkip > mOffset,
+ MediaByteRange(0, 0));
+ mOffset += read + bytesToSkip;
+ }
+ }
+
+ if (!foundFrame || !mParser.CurrentFrame().Length()) {
+ MP3LOG("FindNext() Exit foundFrame=%d mParser.CurrentFrame().Length()=%d ",
+ foundFrame, mParser.CurrentFrame().Length());
+ return { 0, 0 };
+ }
+
+ MP3LOGV("FindNext() End mOffset=%" PRIu64 " mNumParsedFrames=%" PRIu64
+ " mFrameIndex=%" PRId64 " frameHeaderOffset=%d"
+ " mTotalFrameLen=%" PRIu64 " mSamplesPerFrame=%d mSamplesPerSecond=%d"
+ " mChannels=%d",
+ mOffset, mNumParsedFrames, mFrameIndex, frameHeaderOffset,
+ mTotalFrameLen, mSamplesPerFrame, mSamplesPerSecond, mChannels);
+
+ return { frameHeaderOffset, frameHeaderOffset + mParser.CurrentFrame().Length() };
+}
+
+bool
+MP3TrackDemuxer::SkipNextFrame(const MediaByteRange& aRange) {
+ if (!mNumParsedFrames || !aRange.Length()) {
+ // We can't skip the first frame, since it could contain VBR headers.
+ RefPtr<MediaRawData> frame(GetNextFrame(aRange));
+ return frame;
+ }
+
+ UpdateState(aRange);
+
+ MP3LOGV("SkipNext() End mOffset=%" PRIu64 " mNumParsedFrames=%" PRIu64
+ " mFrameIndex=%" PRId64 " mTotalFrameLen=%" PRIu64
+ " mSamplesPerFrame=%d mSamplesPerSecond=%d mChannels=%d",
+ mOffset, mNumParsedFrames, mFrameIndex, mTotalFrameLen,
+ mSamplesPerFrame, mSamplesPerSecond, mChannels);
+
+ return true;
+}
+
+already_AddRefed<MediaRawData>
+MP3TrackDemuxer::GetNextFrame(const MediaByteRange& aRange) {
+ MP3LOG("GetNext() Begin({mStart=%" PRId64 " Length()=%" PRId64 "})",
+ aRange.mStart, aRange.Length());
+ if (!aRange.Length()) {
+ return nullptr;
+ }
+
+ RefPtr<MediaRawData> frame = new MediaRawData();
+ frame->mOffset = aRange.mStart;
+
+ nsAutoPtr<MediaRawDataWriter> frameWriter(frame->CreateWriter());
+ if (!frameWriter->SetSize(aRange.Length())) {
+ MP3LOG("GetNext() Exit failed to allocated media buffer");
+ return nullptr;
+ }
+
+ const uint32_t read = Read(frameWriter->Data(), frame->mOffset, frame->Size());
+
+ if (read != aRange.Length()) {
+ MP3LOG("GetNext() Exit read=%u frame->Size()=%u", read, frame->Size());
+ return nullptr;
+ }
+
+ UpdateState(aRange);
+
+ frame->mTime = Duration(mFrameIndex - 1).ToMicroseconds();
+ frame->mDuration = Duration(1).ToMicroseconds();
+ frame->mTimecode = frame->mTime;
+ frame->mKeyframe = true;
+
+ MOZ_ASSERT(frame->mTime >= 0);
+ MOZ_ASSERT(frame->mDuration > 0);
+
+ if (mNumParsedFrames == 1) {
+ // First frame parsed, let's read VBR info if available.
+ ByteReader reader(frame->Data(), frame->Size());
+ mParser.ParseVBRHeader(&reader);
+ mFirstFrameOffset = frame->mOffset;
+ }
+
+ MP3LOGV("GetNext() End mOffset=%" PRIu64 " mNumParsedFrames=%" PRIu64
+ " mFrameIndex=%" PRId64 " mTotalFrameLen=%" PRIu64
+ " mSamplesPerFrame=%d mSamplesPerSecond=%d mChannels=%d",
+ mOffset, mNumParsedFrames, mFrameIndex, mTotalFrameLen,
+ mSamplesPerFrame, mSamplesPerSecond, mChannels);
+
+ return frame.forget();
+}
+
+int64_t
+MP3TrackDemuxer::OffsetFromFrameIndex(int64_t aFrameIndex) const {
+ int64_t offset = 0;
+ const auto& vbr = mParser.VBRInfo();
+
+ if (vbr.IsComplete()) {
+ offset = mFirstFrameOffset + aFrameIndex * vbr.NumBytes().value() /
+ vbr.NumAudioFrames().value();
+ } else if (AverageFrameLength() > 0) {
+ offset = mFirstFrameOffset + aFrameIndex * AverageFrameLength();
+ }
+
+ MP3LOGV("OffsetFromFrameIndex(%" PRId64 ") -> %" PRId64, aFrameIndex, offset);
+ return std::max<int64_t>(mFirstFrameOffset, offset);
+}
+
+int64_t
+MP3TrackDemuxer::FrameIndexFromOffset(int64_t aOffset) const {
+ int64_t frameIndex = 0;
+ const auto& vbr = mParser.VBRInfo();
+
+ if (vbr.IsComplete()) {
+ frameIndex = static_cast<float>(aOffset - mFirstFrameOffset) /
+ vbr.NumBytes().value() * vbr.NumAudioFrames().value();
+ frameIndex = std::min<int64_t>(vbr.NumAudioFrames().value(), frameIndex);
+ } else if (AverageFrameLength() > 0) {
+ frameIndex = (aOffset - mFirstFrameOffset) / AverageFrameLength();
+ }
+
+ MP3LOGV("FrameIndexFromOffset(%" PRId64 ") -> %" PRId64, aOffset, frameIndex);
+ return std::max<int64_t>(0, frameIndex);
+}
+
+int64_t
+MP3TrackDemuxer::FrameIndexFromTime(const media::TimeUnit& aTime) const {
+ int64_t frameIndex = 0;
+ if (mSamplesPerSecond > 0 && mSamplesPerFrame > 0) {
+ frameIndex = aTime.ToSeconds() * mSamplesPerSecond / mSamplesPerFrame - 1;
+ }
+
+ MP3LOGV("FrameIndexFromOffset(%fs) -> %" PRId64, aTime.ToSeconds(), frameIndex);
+ return std::max<int64_t>(0, frameIndex);
+}
+
+void
+MP3TrackDemuxer::UpdateState(const MediaByteRange& aRange) {
+ // Prevent overflow.
+ if (mTotalFrameLen + aRange.Length() < mTotalFrameLen) {
+ // These variables have a linear dependency and are only used to derive the
+ // average frame length.
+ mTotalFrameLen /= 2;
+ mNumParsedFrames /= 2;
+ }
+
+ // Full frame parsed, move offset to its end.
+ mOffset = aRange.mEnd;
+
+ mTotalFrameLen += aRange.Length();
+
+ if (!mSamplesPerFrame) {
+ mSamplesPerFrame = mParser.CurrentFrame().Header().SamplesPerFrame();
+ mSamplesPerSecond = mParser.CurrentFrame().Header().SampleRate();
+ mChannels = mParser.CurrentFrame().Header().Channels();
+ }
+
+ ++mNumParsedFrames;
+ ++mFrameIndex;
+ MOZ_ASSERT(mFrameIndex > 0);
+
+ // Prepare the parser for the next frame parsing session.
+ mParser.EndFrameSession();
+}
+
+int32_t
+MP3TrackDemuxer::Read(uint8_t* aBuffer, int64_t aOffset, int32_t aSize) {
+ MP3LOGV("MP3TrackDemuxer::Read(%p %" PRId64 " %d)", aBuffer, aOffset, aSize);
+
+ const int64_t streamLen = StreamLength();
+ if (mInfo && streamLen > 0) {
+ // Prevent blocking reads after successful initialization.
+ aSize = std::min<int64_t>(aSize, streamLen - aOffset);
+ }
+
+ uint32_t read = 0;
+ MP3LOGV("MP3TrackDemuxer::Read -> ReadAt(%d)", aSize);
+ const nsresult rv = mSource.ReadAt(aOffset, reinterpret_cast<char*>(aBuffer),
+ static_cast<uint32_t>(aSize), &read);
+ NS_ENSURE_SUCCESS(rv, 0);
+ return static_cast<int32_t>(read);
+}
+
+double
+MP3TrackDemuxer::AverageFrameLength() const {
+ if (mNumParsedFrames) {
+ return static_cast<double>(mTotalFrameLen) / mNumParsedFrames;
+ }
+ const auto& vbr = mParser.VBRInfo();
+ if (vbr.IsComplete() && vbr.NumAudioFrames().value() + 1) {
+ return static_cast<double>(vbr.NumBytes().value()) /
+ (vbr.NumAudioFrames().value() + 1);
+ }
+ return 0.0;
+}
+
+// FrameParser
+
+namespace frame_header {
+// FrameHeader mRaw byte offsets.
+static const int SYNC1 = 0;
+static const int SYNC2_VERSION_LAYER_PROTECTION = 1;
+static const int BITRATE_SAMPLERATE_PADDING_PRIVATE = 2;
+static const int CHANNELMODE_MODEEXT_COPY_ORIG_EMPH = 3;
+} // namespace frame_header
+
+FrameParser::FrameParser()
+{
+}
+
+void
+FrameParser::Reset() {
+ mID3Parser.Reset();
+ mFrame.Reset();
+}
+
+void
+FrameParser::ResetFrameData() {
+ mFrame.Reset();
+ mFirstFrame.Reset();
+ mPrevFrame.Reset();
+}
+
+void
+FrameParser::EndFrameSession() {
+ if (!mID3Parser.Header().IsValid()) {
+ // Reset ID3 tags only if we have not parsed a valid ID3 header yet.
+ mID3Parser.Reset();
+ }
+ mPrevFrame = mFrame;
+ mFrame.Reset();
+}
+
+const FrameParser::Frame&
+FrameParser::CurrentFrame() const {
+ return mFrame;
+}
+
+const FrameParser::Frame&
+FrameParser::PrevFrame() const {
+ return mPrevFrame;
+}
+
+const FrameParser::Frame&
+FrameParser::FirstFrame() const {
+ return mFirstFrame;
+}
+
+const ID3Parser::ID3Header&
+FrameParser::ID3Header() const {
+ return mID3Parser.Header();
+}
+
+const FrameParser::VBRHeader&
+FrameParser::VBRInfo() const {
+ return mVBRHeader;
+}
+
+bool
+FrameParser::Parse(ByteReader* aReader, uint32_t* aBytesToSkip) {
+ MOZ_ASSERT(aReader && aBytesToSkip);
+ *aBytesToSkip = 0;
+
+ if (!mID3Parser.Header().Size() && !mFirstFrame.Length()) {
+ // No MP3 frames have been parsed yet, look for ID3v2 headers at file begin.
+ // ID3v1 tags may only be at file end.
+ // TODO: should we try to read ID3 tags at end of file/mid-stream, too?
+ const size_t prevReaderOffset = aReader->Offset();
+ const uint32_t tagSize = mID3Parser.Parse(aReader);
+ if (tagSize) {
+ // ID3 tag found, skip past it.
+ const uint32_t skipSize = tagSize - ID3Parser::ID3Header::SIZE;
+
+ if (skipSize > aReader->Remaining()) {
+ // Skipping across the ID3v2 tag would take us past the end of the buffer, therefore we
+ // return immediately and let the calling function handle skipping the rest of the tag.
+ MP3LOGV("ID3v2 tag detected, size=%d,"
+ " needing to skip %d bytes past the current buffer",
+ tagSize, skipSize - aReader->Remaining());
+ *aBytesToSkip = skipSize - aReader->Remaining();
+ return false;
+ }
+ MP3LOGV("ID3v2 tag detected, size=%d", tagSize);
+ aReader->Read(skipSize);
+ } else {
+ // No ID3v2 tag found, rewinding reader in order to search for a MPEG frame header.
+ aReader->Seek(prevReaderOffset);
+ }
+ }
+
+ while (aReader->CanRead8() && !mFrame.ParseNext(aReader->ReadU8())) { }
+
+ if (mFrame.Length()) {
+ // MP3 frame found.
+ if (!mFirstFrame.Length()) {
+ mFirstFrame = mFrame;
+ }
+ // Indicate success.
+ return true;
+ }
+ return false;
+}
+
+// FrameParser::Header
+
+FrameParser::FrameHeader::FrameHeader()
+{
+ Reset();
+}
+
+uint8_t
+FrameParser::FrameHeader::Sync1() const {
+ return mRaw[frame_header::SYNC1];
+}
+
+uint8_t
+FrameParser::FrameHeader::Sync2() const {
+ return 0x7 & mRaw[frame_header::SYNC2_VERSION_LAYER_PROTECTION] >> 5;
+}
+
+uint8_t
+FrameParser::FrameHeader::RawVersion() const {
+ return 0x3 & mRaw[frame_header::SYNC2_VERSION_LAYER_PROTECTION] >> 3;
+}
+
+uint8_t
+FrameParser::FrameHeader::RawLayer() const {
+ return 0x3 & mRaw[frame_header::SYNC2_VERSION_LAYER_PROTECTION] >> 1;
+}
+
+uint8_t
+FrameParser::FrameHeader::RawProtection() const {
+ return 0x1 & mRaw[frame_header::SYNC2_VERSION_LAYER_PROTECTION] >> 6;
+}
+
+uint8_t
+FrameParser::FrameHeader::RawBitrate() const {
+ return 0xF & mRaw[frame_header::BITRATE_SAMPLERATE_PADDING_PRIVATE] >> 4;
+}
+
+uint8_t
+FrameParser::FrameHeader::RawSampleRate() const {
+ return 0x3 & mRaw[frame_header::BITRATE_SAMPLERATE_PADDING_PRIVATE] >> 2;
+}
+
+uint8_t
+FrameParser::FrameHeader::Padding() const {
+ return 0x1 & mRaw[frame_header::BITRATE_SAMPLERATE_PADDING_PRIVATE] >> 1;
+}
+
+uint8_t
+FrameParser::FrameHeader::Private() const {
+ return 0x1 & mRaw[frame_header::BITRATE_SAMPLERATE_PADDING_PRIVATE];
+}
+
+uint8_t
+FrameParser::FrameHeader::RawChannelMode() const {
+ return 0x3 & mRaw[frame_header::CHANNELMODE_MODEEXT_COPY_ORIG_EMPH] >> 6;
+}
+
+int32_t
+FrameParser::FrameHeader::Layer() const {
+ static const uint8_t LAYERS[4] = { 0, 3, 2, 1 };
+
+ return LAYERS[RawLayer()];
+}
+
+int32_t
+FrameParser::FrameHeader::SampleRate() const {
+ // Sample rates - use [version][srate]
+ static const uint16_t SAMPLE_RATE[4][4] = {
+ { 11025, 12000, 8000, 0 }, // MPEG 2.5
+ { 0, 0, 0, 0 }, // Reserved
+ { 22050, 24000, 16000, 0 }, // MPEG 2
+ { 44100, 48000, 32000, 0 } // MPEG 1
+ };
+
+ return SAMPLE_RATE[RawVersion()][RawSampleRate()];
+}
+
+int32_t
+FrameParser::FrameHeader::Channels() const {
+ // 3 is single channel (mono), any other value is some variant of dual
+ // channel.
+ return RawChannelMode() == 3 ? 1 : 2;
+}
+
+int32_t
+FrameParser::FrameHeader::SamplesPerFrame() const {
+ // Samples per frame - use [version][layer]
+ static const uint16_t FRAME_SAMPLE[4][4] = {
+ // Layer 3 2 1 Version
+ { 0, 576, 1152, 384 }, // 2.5
+ { 0, 0, 0, 0 }, // Reserved
+ { 0, 576, 1152, 384 }, // 2
+ { 0, 1152, 1152, 384 } // 1
+ };
+
+ return FRAME_SAMPLE[RawVersion()][RawLayer()];
+}
+
+int32_t
+FrameParser::FrameHeader::Bitrate() const {
+ // Bitrates - use [version][layer][bitrate]
+ static const uint16_t BITRATE[4][4][16] = {
+ { // Version 2.5
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, // Reserved
+ { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0 }, // Layer 3
+ { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0 }, // Layer 2
+ { 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, 0 } // Layer 1
+ },
+ { // Reserved
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, // Invalid
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, // Invalid
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, // Invalid
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } // Invalid
+ },
+ { // Version 2
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, // Reserved
+ { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0 }, // Layer 3
+ { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0 }, // Layer 2
+ { 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, 0 } // Layer 1
+ },
+ { // Version 1
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, // Reserved
+ { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0 }, // Layer 3
+ { 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 0 }, // Layer 2
+ { 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, 0 }, // Layer 1
+ }
+ };
+
+ return 1000 * BITRATE[RawVersion()][RawLayer()][RawBitrate()];
+}
+
+int32_t
+FrameParser::FrameHeader::SlotSize() const {
+ // Slot size (MPEG unit of measurement) - use [layer]
+ static const uint8_t SLOT_SIZE[4] = { 0, 1, 1, 4 }; // Rsvd, 3, 2, 1
+
+ return SLOT_SIZE[RawLayer()];
+}
+
+bool
+FrameParser::FrameHeader::ParseNext(uint8_t c) {
+ if (!Update(c)) {
+ Reset();
+ if (!Update(c)) {
+ Reset();
+ }
+ }
+ return IsValid();
+}
+
+bool
+FrameParser::FrameHeader::IsValid(int aPos) const {
+ if (aPos >= SIZE) {
+ return true;
+ }
+ if (aPos == frame_header::SYNC1) {
+ return Sync1() == 0xFF;
+ }
+ if (aPos == frame_header::SYNC2_VERSION_LAYER_PROTECTION) {
+ return Sync2() == 7 &&
+ RawVersion() != 1 &&
+ Layer() == 3;
+ }
+ if (aPos == frame_header::BITRATE_SAMPLERATE_PADDING_PRIVATE) {
+ return RawBitrate() != 0xF && RawBitrate() != 0 &&
+ RawSampleRate() != 3;
+ }
+ return true;
+}
+
+bool
+FrameParser::FrameHeader::IsValid() const {
+ return mPos >= SIZE;
+}
+
+void
+FrameParser::FrameHeader::Reset() {
+ mPos = 0;
+}
+
+bool
+FrameParser::FrameHeader::Update(uint8_t c) {
+ if (mPos < SIZE) {
+ mRaw[mPos] = c;
+ }
+ return IsValid(mPos++);
+}
+
+// FrameParser::VBRHeader
+
+namespace vbr_header {
+static const char* TYPE_STR[3] = {"NONE", "XING", "VBRI"};
+static const uint32_t TOC_SIZE = 100;
+} // namespace vbr_header
+
+FrameParser::VBRHeader::VBRHeader()
+ : mType(NONE)
+{
+}
+
+FrameParser::VBRHeader::VBRHeaderType
+FrameParser::VBRHeader::Type() const {
+ return mType;
+}
+
+const Maybe<uint32_t>&
+FrameParser::VBRHeader::NumAudioFrames() const {
+ return mNumAudioFrames;
+}
+
+const Maybe<uint32_t>&
+FrameParser::VBRHeader::NumBytes() const {
+ return mNumBytes;
+}
+
+const Maybe<uint32_t>&
+FrameParser::VBRHeader::Scale() const {
+ return mScale;
+}
+
+bool
+FrameParser::VBRHeader::IsTOCPresent() const {
+ return mTOC.size() == vbr_header::TOC_SIZE;
+}
+
+bool
+FrameParser::VBRHeader::IsValid() const {
+ return mType != NONE;
+}
+
+bool
+FrameParser::VBRHeader::IsComplete() const {
+ return IsValid() &&
+ mNumAudioFrames.valueOr(0) > 0 &&
+ mNumBytes.valueOr(0) > 0 &&
+ // We don't care about the scale for any computations here.
+ // mScale < 101 &&
+ true;
+}
+
+int64_t
+FrameParser::VBRHeader::Offset(float aDurationFac) const {
+ if (!IsTOCPresent()) {
+ return -1;
+ }
+
+ // Constrain the duration percentage to [0, 99].
+ const float durationPer = 100.0f * std::min(0.99f, std::max(0.0f, aDurationFac));
+ const size_t fullPer = durationPer;
+ const float rest = durationPer - fullPer;
+
+ MOZ_ASSERT(fullPer < mTOC.size());
+ int64_t offset = mTOC.at(fullPer);
+
+ if (rest > 0.0 && fullPer + 1 < mTOC.size()) {
+ offset += rest * (mTOC.at(fullPer + 1) - offset);
+ }
+
+ return offset;
+}
+
+bool
+FrameParser::VBRHeader::ParseXing(ByteReader* aReader) {
+ static const uint32_t XING_TAG = BigEndian::readUint32("Xing");
+ static const uint32_t INFO_TAG = BigEndian::readUint32("Info");
+
+ enum Flags {
+ NUM_FRAMES = 0x01,
+ NUM_BYTES = 0x02,
+ TOC = 0x04,
+ VBR_SCALE = 0x08
+ };
+
+ MOZ_ASSERT(aReader);
+ const size_t prevReaderOffset = aReader->Offset();
+
+ // We have to search for the Xing header as its position can change.
+ while (aReader->CanRead32() &&
+ aReader->PeekU32() != XING_TAG && aReader->PeekU32() != INFO_TAG) {
+ aReader->Read(1);
+ }
+
+ if (aReader->CanRead32()) {
+ // Skip across the VBR header ID tag.
+ aReader->ReadU32();
+ mType = XING;
+ }
+ uint32_t flags = 0;
+ if (aReader->CanRead32()) {
+ flags = aReader->ReadU32();
+ }
+ if (flags & NUM_FRAMES && aReader->CanRead32()) {
+ mNumAudioFrames = Some(aReader->ReadU32());
+ }
+ if (flags & NUM_BYTES && aReader->CanRead32()) {
+ mNumBytes = Some(aReader->ReadU32());
+ }
+ if (flags & TOC && aReader->Remaining() >= vbr_header::TOC_SIZE) {
+ if (!mNumBytes) {
+ // We don't have the stream size to calculate offsets, skip the TOC.
+ aReader->Read(vbr_header::TOC_SIZE);
+ } else {
+ mTOC.clear();
+ mTOC.reserve(vbr_header::TOC_SIZE);
+ for (size_t i = 0; i < vbr_header::TOC_SIZE; ++i) {
+ mTOC.push_back(1.0f / 256.0f * aReader->ReadU8() * mNumBytes.value());
+ }
+ }
+ }
+ if (flags & VBR_SCALE && aReader->CanRead32()) {
+ mScale = Some(aReader->ReadU32());
+ }
+
+ aReader->Seek(prevReaderOffset);
+ return mType == XING;
+}
+
+bool
+FrameParser::VBRHeader::ParseVBRI(ByteReader* aReader) {
+ static const uint32_t TAG = BigEndian::readUint32("VBRI");
+ static const uint32_t OFFSET = 32 + FrameParser::FrameHeader::SIZE;
+ static const uint32_t FRAME_COUNT_OFFSET = OFFSET + 14;
+ static const uint32_t MIN_FRAME_SIZE = OFFSET + 26;
+
+ MOZ_ASSERT(aReader);
+ // ParseVBRI assumes that the ByteReader offset points to the beginning of a frame,
+ // therefore as a simple check, we look for the presence of a frame sync at that position.
+ MOZ_ASSERT((aReader->PeekU16() & 0xFFE0) == 0xFFE0);
+ const size_t prevReaderOffset = aReader->Offset();
+
+ // VBRI have a fixed relative position, so let's check for it there.
+ if (aReader->Remaining() > MIN_FRAME_SIZE) {
+ aReader->Seek(prevReaderOffset + OFFSET);
+ if (aReader->ReadU32() == TAG) {
+ aReader->Seek(prevReaderOffset + FRAME_COUNT_OFFSET);
+ mNumAudioFrames = Some(aReader->ReadU32());
+ mType = VBRI;
+ aReader->Seek(prevReaderOffset);
+ return true;
+ }
+ }
+ aReader->Seek(prevReaderOffset);
+ return false;
+}
+
+bool
+FrameParser::VBRHeader::Parse(ByteReader* aReader) {
+ const bool rv = ParseVBRI(aReader) || ParseXing(aReader);
+ if (rv) {
+ MP3LOG("VBRHeader::Parse found valid VBR/CBR header: type=%s"
+ " NumAudioFrames=%u NumBytes=%u Scale=%u TOC-size=%u",
+ vbr_header::TYPE_STR[Type()], NumAudioFrames().valueOr(0),
+ NumBytes().valueOr(0), Scale().valueOr(0), mTOC.size());
+ }
+ return rv;
+}
+
+// FrameParser::Frame
+
+void
+FrameParser::Frame::Reset() {
+ mHeader.Reset();
+}
+
+int32_t
+FrameParser::Frame::Length() const {
+ if (!mHeader.IsValid() || !mHeader.SampleRate()) {
+ return 0;
+ }
+
+ const float bitsPerSample = mHeader.SamplesPerFrame() / 8.0f;
+ const int32_t frameLen = bitsPerSample * mHeader.Bitrate() /
+ mHeader.SampleRate() +
+ mHeader.Padding() * mHeader.SlotSize();
+ return frameLen;
+}
+
+bool
+FrameParser::Frame::ParseNext(uint8_t c) {
+ return mHeader.ParseNext(c);
+}
+
+const FrameParser::FrameHeader&
+FrameParser::Frame::Header() const {
+ return mHeader;
+}
+
+bool
+FrameParser::ParseVBRHeader(ByteReader* aReader) {
+ return mVBRHeader.Parse(aReader);
+}
+
+// ID3Parser
+
+// Constants
+namespace id3_header {
+static const int ID_LEN = 3;
+static const int VERSION_LEN = 2;
+static const int FLAGS_LEN = 1;
+static const int SIZE_LEN = 4;
+
+static const int ID_END = ID_LEN;
+static const int VERSION_END = ID_END + VERSION_LEN;
+static const int FLAGS_END = VERSION_END + FLAGS_LEN;
+static const int SIZE_END = FLAGS_END + SIZE_LEN;
+
+static const uint8_t ID[ID_LEN] = {'I', 'D', '3'};
+
+static const uint8_t MIN_MAJOR_VER = 2;
+static const uint8_t MAX_MAJOR_VER = 4;
+} // namespace id3_header
+
+uint32_t
+ID3Parser::Parse(ByteReader* aReader) {
+ MOZ_ASSERT(aReader);
+
+ while (aReader->CanRead8() && !mHeader.ParseNext(aReader->ReadU8())) { }
+
+ if (mHeader.IsValid()) {
+ // Header found, return total tag size.
+ return ID3Header::SIZE + Header().Size() + Header().FooterSize();
+ }
+ return 0;
+}
+
+void
+ID3Parser::Reset() {
+ mHeader.Reset();
+}
+
+const ID3Parser::ID3Header&
+ID3Parser::Header() const {
+ return mHeader;
+}
+
+// ID3Parser::Header
+
+ID3Parser::ID3Header::ID3Header()
+{
+ Reset();
+}
+
+void
+ID3Parser::ID3Header::Reset() {
+ mSize = 0;
+ mPos = 0;
+}
+
+uint8_t
+ID3Parser::ID3Header::MajorVersion() const {
+ return mRaw[id3_header::ID_END];
+}
+
+uint8_t
+ID3Parser::ID3Header::MinorVersion() const {
+ return mRaw[id3_header::ID_END + 1];
+}
+
+uint8_t
+ID3Parser::ID3Header::Flags() const {
+ return mRaw[id3_header::FLAGS_END - id3_header::FLAGS_LEN];
+}
+
+uint32_t
+ID3Parser::ID3Header::Size() const {
+ if (!IsValid()) {
+ return 0;
+ }
+ return mSize;
+}
+
+uint8_t
+ID3Parser::ID3Header::FooterSize() const {
+ if (Flags() & (1 << 4)) {
+ return SIZE;
+ }
+ return 0;
+}
+
+bool
+ID3Parser::ID3Header::ParseNext(uint8_t c) {
+ if (!Update(c)) {
+ Reset();
+ if (!Update(c)) {
+ Reset();
+ }
+ }
+ return IsValid();
+}
+
+bool
+ID3Parser::ID3Header::IsValid(int aPos) const {
+ if (aPos >= SIZE) {
+ return true;
+ }
+ const uint8_t c = mRaw[aPos];
+ switch (aPos) {
+ case 0: case 1: case 2:
+ // Expecting "ID3".
+ return id3_header::ID[aPos] == c;
+ case 3:
+ return MajorVersion() >= id3_header::MIN_MAJOR_VER &&
+ MajorVersion() <= id3_header::MAX_MAJOR_VER;
+ case 4:
+ return MinorVersion() < 0xFF;
+ case 5:
+ // Validate flags for supported versions, see bug 949036.
+ return ((0xFF >> MajorVersion()) & c) == 0;
+ case 6: case 7: case 8: case 9:
+ return c < 0x80;
+ }
+ return true;
+}
+
+bool
+ID3Parser::ID3Header::IsValid() const {
+ return mPos >= SIZE;
+}
+
+bool
+ID3Parser::ID3Header::Update(uint8_t c) {
+ if (mPos >= id3_header::SIZE_END - id3_header::SIZE_LEN &&
+ mPos < id3_header::SIZE_END) {
+ mSize <<= 7;
+ mSize |= c;
+ }
+ if (mPos < SIZE) {
+ mRaw[mPos] = c;
+ }
+ return IsValid(mPos++);
+}
+
+} // namespace mozilla
diff --git a/dom/media/mp3/MP3Demuxer.h b/dom/media/mp3/MP3Demuxer.h
new file mode 100644
index 000000000..5331c4d54
--- /dev/null
+++ b/dom/media/mp3/MP3Demuxer.h
@@ -0,0 +1,472 @@
+/* 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/. */
+
+#ifndef MP3_DEMUXER_H_
+#define MP3_DEMUXER_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/Maybe.h"
+#include "MediaDataDemuxer.h"
+#include "MediaResource.h"
+#include "mp4_demuxer/ByteReader.h"
+#include <vector>
+
+namespace mozilla {
+
+class MP3TrackDemuxer;
+
+class MP3Demuxer : public MediaDataDemuxer {
+public:
+ // MediaDataDemuxer interface.
+ explicit MP3Demuxer(MediaResource* aSource);
+ RefPtr<InitPromise> Init() override;
+ bool HasTrackType(TrackInfo::TrackType aType) const override;
+ uint32_t GetNumberTracks(TrackInfo::TrackType aType) const override;
+ already_AddRefed<MediaTrackDemuxer> GetTrackDemuxer(
+ TrackInfo::TrackType aType, uint32_t aTrackNumber) override;
+ bool IsSeekable() const override;
+ void NotifyDataArrived() override;
+ void NotifyDataRemoved() override;
+
+private:
+ // Synchronous initialization.
+ bool InitInternal();
+
+ RefPtr<MediaResource> mSource;
+ RefPtr<MP3TrackDemuxer> mTrackDemuxer;
+};
+
+// ID3 header parser state machine used by FrameParser.
+// The header contains the following format (one byte per term):
+// 'I' 'D' '3' MajorVersion MinorVersion Flags Size1 Size2 Size3 Size4
+// For more details see http://id3.org/id3v2.3.0.
+class ID3Parser {
+public:
+ // Holds the ID3 header and its parsing state.
+ class ID3Header {
+ public:
+ // The header size is static, see class comment.
+ static const int SIZE = 10;
+
+ // Constructor.
+ ID3Header();
+
+ // Resets the state to allow for a new parsing session.
+ void Reset();
+
+ // The ID3 tags are versioned like this: ID3vMajorVersion.MinorVersion.
+ uint8_t MajorVersion() const;
+ uint8_t MinorVersion() const;
+
+ // The ID3 flags field.
+ uint8_t Flags() const;
+
+ // The derived size based on the provided size fields.
+ uint32_t Size() const;
+
+ // Returns the size of an ID3v2.4 footer if present and zero otherwise.
+ uint8_t FooterSize() const;
+
+ // Returns whether the parsed data is a valid ID3 header up to the given
+ // byte position.
+ bool IsValid(int aPos) const;
+
+ // Returns whether the parsed data is a complete and valid ID3 header.
+ bool IsValid() const;
+
+ // Parses the next provided byte.
+ // Returns whether the byte creates a valid sequence up to this point.
+ bool ParseNext(uint8_t c);
+
+ private:
+ // Updates the parser state machine with the provided next byte.
+ // Returns whether the provided byte is a valid next byte in the sequence.
+ bool Update(uint8_t c);
+
+ // The currently parsed byte sequence.
+ uint8_t mRaw[SIZE];
+
+ // The derived size as provided by the size fields.
+ // The header size fields holds a 4 byte sequence with each MSB set to 0,
+ // this bits need to be ignored when deriving the actual size.
+ uint32_t mSize;
+
+ // The current byte position in the parsed sequence. Reset via Reset and
+ // incremented via Update.
+ int mPos;
+ };
+
+ // Returns the parsed ID3 header. Note: check for validity.
+ const ID3Header& Header() const;
+
+ // Parses contents of given ByteReader for a valid ID3v2 header.
+ // Returns the total ID3v2 tag size if successful and zero otherwise.
+ uint32_t Parse(mp4_demuxer::ByteReader* aReader);
+
+ // Resets the state to allow for a new parsing session.
+ void Reset();
+
+private:
+ // The currently parsed ID3 header. Reset via Reset, updated via Parse.
+ ID3Header mHeader;
+};
+
+// MPEG audio frame parser.
+// The MPEG frame header has the following format (one bit per character):
+// 11111111 111VVLLC BBBBSSPR MMEETOHH
+// { sync } - 11 sync bits
+// VV - MPEG audio version ID (0->2.5, 1->reserved, 2->2, 3->1)
+// LL - Layer description (0->reserved, 1->III, 2->II, 3->I)
+// C - CRC protection bit (0->protected, 1->not protected)
+// BBBB - Bitrate index (see table in implementation)
+// SS - Sampling rate index (see table in implementation)
+// P - Padding bit (0->not padded, 1->padded by 1 slot size)
+// R - Private bit (ignored)
+// MM - Channel mode (0->stereo, 1->joint stereo, 2->dual channel,
+// 3->single channel)
+// EE - Mode extension for joint stereo (ignored)
+// T - Copyright (0->disabled, 1->enabled)
+// O - Original (0->copy, 1->original)
+// HH - Emphasis (0->none, 1->50/15 ms, 2->reserved, 3->CCIT J.17)
+class FrameParser {
+public:
+ // Holds the frame header and its parsing state.
+ class FrameHeader {
+ public:
+ // The header size is static, see class comments.
+ static const int SIZE = 4;
+
+ // Constructor.
+ FrameHeader();
+
+ // Raw field access, see class comments for details.
+ uint8_t Sync1() const;
+ uint8_t Sync2() const;
+ uint8_t RawVersion() const;
+ uint8_t RawLayer() const;
+ uint8_t RawProtection() const;
+ uint8_t RawBitrate() const;
+ uint8_t RawSampleRate() const;
+ uint8_t Padding() const;
+ uint8_t Private() const;
+ uint8_t RawChannelMode() const;
+
+ // Sampling rate frequency in Hz.
+ int32_t SampleRate() const;
+
+ // Number of audio channels.
+ int32_t Channels() const;
+
+ // Samples per frames, static depending on MPEG version and layer.
+ int32_t SamplesPerFrame() const;
+
+ // Slot size used for padding, static depending on MPEG layer.
+ int32_t SlotSize() const;
+
+ // Bitrate in kbps, can vary between frames.
+ int32_t Bitrate() const;
+
+ // MPEG layer (0->invalid, 1->I, 2->II, 3->III).
+ int32_t Layer() const;
+
+ // Returns whether the parsed data is a valid frame header up to the given
+ // byte position.
+ bool IsValid(const int aPos) const;
+
+ // Returns whether the parsed data is a complete and valid frame header.
+ bool IsValid() const;
+
+ // Resets the state to allow for a new parsing session.
+ void Reset();
+
+ // Parses the next provided byte.
+ // Returns whether the byte creates a valid sequence up to this point.
+ bool ParseNext(const uint8_t c);
+
+ private:
+ // Updates the parser state machine with the provided next byte.
+ // Returns whether the provided byte is a valid next byte in the sequence.
+ bool Update(const uint8_t c);
+
+ // The currently parsed byte sequence.
+ uint8_t mRaw[SIZE];
+
+ // The current byte position in the parsed sequence. Reset via Reset and
+ // incremented via Update.
+ int mPos;
+ };
+
+ // VBR frames may contain Xing or VBRI headers for additional info, we use
+ // this class to parse them and access this info.
+ class VBRHeader {
+ public:
+ // Synchronize with vbr_header TYPE_STR on change.
+ enum VBRHeaderType {
+ NONE = 0,
+ XING,
+ VBRI
+ };
+
+ // Constructor.
+ VBRHeader();
+
+ // Returns the parsed VBR header type, or NONE if no valid header found.
+ VBRHeaderType Type() const;
+
+ // Returns the total number of audio frames (excluding the VBR header frame)
+ // expected in the stream/file.
+ const Maybe<uint32_t>& NumAudioFrames() const;
+
+ // Returns the expected size of the stream.
+ const Maybe<uint32_t>& NumBytes() const;
+
+ // Returns the VBR scale factor (0: best quality, 100: lowest quality).
+ const Maybe<uint32_t>& Scale() const;
+
+ // Returns true iff Xing/Info TOC (table of contents) is present.
+ bool IsTOCPresent() const;
+
+ // Returns whether the header is valid (type XING or VBRI).
+ bool IsValid() const;
+
+ // Returns whether the header is valid and contains reasonable non-zero field values.
+ bool IsComplete() const;
+
+ // Returns the byte offset for the given duration percentage as a factor
+ // (0: begin, 1.0: end).
+ int64_t Offset(float aDurationFac) const;
+
+ // Parses contents of given ByteReader for a valid VBR header.
+ // The offset of the passed ByteReader needs to point to an MPEG frame begin,
+ // as a VBRI-style header is searched at a fixed offset relative to frame begin.
+ // Returns whether a valid VBR header was found in the range.
+ bool Parse(mp4_demuxer::ByteReader* aReader);
+
+ private:
+ // Parses contents of given ByteReader for a valid Xing header.
+ // The initial ByteReader offset will be preserved.
+ // Returns whether a valid Xing header was found in the range.
+ bool ParseXing(mp4_demuxer::ByteReader* aReader);
+
+ // Parses contents of given ByteReader for a valid VBRI header.
+ // The initial ByteReader offset will be preserved. It also needs to point
+ // to the beginning of a valid MPEG frame, as VBRI headers are searched
+ // at a fixed offset relative to frame begin.
+ // Returns whether a valid VBRI header was found in the range.
+ bool ParseVBRI(mp4_demuxer::ByteReader* aReader);
+
+ // The total number of frames expected as parsed from a VBR header.
+ Maybe<uint32_t> mNumAudioFrames;
+
+ // The total number of bytes expected in the stream.
+ Maybe<uint32_t> mNumBytes;
+
+ // The VBR scale factor.
+ Maybe<uint32_t> mScale;
+
+ // The TOC table mapping duration percentage to byte offset.
+ std::vector<int64_t> mTOC;
+
+ // The detected VBR header type.
+ VBRHeaderType mType;
+ };
+
+ // Frame meta container used to parse and hold a frame header and side info.
+ class Frame {
+ public:
+ // Returns the length of the frame excluding the header in bytes.
+ int32_t Length() const;
+
+ // Returns the parsed frame header.
+ const FrameHeader& Header() const;
+
+ // Resets the frame header and data.
+ void Reset();
+
+ // Parses the next provided byte.
+ // Returns whether the byte creates a valid sequence up to this point.
+ bool ParseNext(uint8_t c);
+
+ private:
+ // The currently parsed frame header.
+ FrameHeader mHeader;
+ };
+
+ // Constructor.
+ FrameParser();
+
+ // Returns the currently parsed frame. Reset via Reset or EndFrameSession.
+ const Frame& CurrentFrame() const;
+
+ // Returns the previously parsed frame. Reset via Reset.
+ const Frame& PrevFrame() const;
+
+ // Returns the first parsed frame. Reset via Reset.
+ const Frame& FirstFrame() const;
+
+ // Returns the parsed ID3 header. Note: check for validity.
+ const ID3Parser::ID3Header& ID3Header() const;
+
+ // Returns the parsed VBR header info. Note: check for validity by type.
+ const VBRHeader& VBRInfo() const;
+
+ // Resets the parser.
+ void Reset();
+
+ // Resets all frame data, but not the ID3Header.
+ // Don't use between frames as first frame data is reset.
+ void ResetFrameData();
+
+ // Clear the last parsed frame to allow for next frame parsing, i.e.:
+ // - sets PrevFrame to CurrentFrame
+ // - resets the CurrentFrame
+ // - resets ID3Header if no valid header was parsed yet
+ void EndFrameSession();
+
+ // Parses contents of given ByteReader for a valid frame header and returns true
+ // if one was found. After returning, the variable passed to 'aBytesToSkip' holds
+ // the amount of bytes to be skipped (if any) in order to jump across a large
+ // ID3v2 tag spanning multiple buffers.
+ bool Parse(mp4_demuxer::ByteReader* aReader, uint32_t* aBytesToSkip);
+
+ // Parses contents of given ByteReader for a valid VBR header.
+ // The offset of the passed ByteReader needs to point to an MPEG frame begin,
+ // as a VBRI-style header is searched at a fixed offset relative to frame begin.
+ // Returns whether a valid VBR header was found.
+ bool ParseVBRHeader(mp4_demuxer::ByteReader* aReader);
+
+private:
+ // ID3 header parser.
+ ID3Parser mID3Parser;
+
+ // VBR header parser.
+ VBRHeader mVBRHeader;
+
+ // We keep the first parsed frame around for static info access, the
+ // previously parsed frame for debugging and the currently parsed frame.
+ Frame mFirstFrame;
+ Frame mFrame;
+ Frame mPrevFrame;
+};
+
+// The MP3 demuxer used to extract MPEG frames and side information out of
+// MPEG streams.
+class MP3TrackDemuxer : public MediaTrackDemuxer {
+public:
+ // Constructor, expecting a valid media resource.
+ explicit MP3TrackDemuxer(MediaResource* aSource);
+
+ // Initializes the track demuxer by reading the first frame for meta data.
+ // Returns initialization success state.
+ bool Init();
+
+ // Returns the total stream length if known, -1 otherwise.
+ int64_t StreamLength() const;
+
+ // Returns the estimated stream duration, or a 0-duration if unknown.
+ media::TimeUnit Duration() const;
+
+ // Returns the estimated duration up to the given frame number,
+ // or a 0-duration if unknown.
+ media::TimeUnit Duration(int64_t aNumFrames) const;
+
+ // Returns the estimated current seek position time.
+ media::TimeUnit SeekPosition() const;
+
+ const FrameParser::Frame& LastFrame() const;
+ RefPtr<MediaRawData> DemuxSample();
+
+ const ID3Parser::ID3Header& ID3Header() const;
+ const FrameParser::VBRHeader& VBRInfo() const;
+
+ // MediaTrackDemuxer interface.
+ UniquePtr<TrackInfo> GetInfo() const override;
+ RefPtr<SeekPromise> Seek(media::TimeUnit aTime) override;
+ RefPtr<SamplesPromise> GetSamples(int32_t aNumSamples = 1) override;
+ void Reset() override;
+ RefPtr<SkipAccessPointPromise> SkipToNextRandomAccessPoint(
+ media::TimeUnit aTimeThreshold) override;
+ int64_t GetResourceOffset() const override;
+ media::TimeIntervals GetBuffered() override;
+
+private:
+ // Destructor.
+ ~MP3TrackDemuxer() {}
+
+ // Fast approximate seeking to given time.
+ media::TimeUnit FastSeek(const media::TimeUnit& aTime);
+
+ // Seeks by scanning the stream up to the given time for more accurate results.
+ media::TimeUnit ScanUntil(const media::TimeUnit& aTime);
+
+ // Finds the first valid frame and returns its byte range if found
+ // or a null-byte range otherwise.
+ MediaByteRange FindFirstFrame();
+
+ // Finds the next valid frame and returns its byte range if found
+ // or a null-byte range otherwise.
+ MediaByteRange FindNextFrame();
+
+ // Skips the next frame given the provided byte range.
+ bool SkipNextFrame(const MediaByteRange& aRange);
+
+ // Returns the next MPEG frame, if available.
+ already_AddRefed<MediaRawData> GetNextFrame(const MediaByteRange& aRange);
+
+ // Updates post-read meta data.
+ void UpdateState(const MediaByteRange& aRange);
+
+ // Returns the estimated offset for the given frame index.
+ int64_t OffsetFromFrameIndex(int64_t aFrameIndex) const;
+
+ // Returns the estimated frame index for the given offset.
+ int64_t FrameIndexFromOffset(int64_t aOffset) const;
+
+ // Returns the estimated frame index for the given time.
+ int64_t FrameIndexFromTime(const media::TimeUnit& aTime) const;
+
+ // Reads aSize bytes into aBuffer from the source starting at aOffset.
+ // Returns the actual size read.
+ int32_t Read(uint8_t* aBuffer, int64_t aOffset, int32_t aSize);
+
+ // Returns the average frame length derived from the previously parsed frames.
+ double AverageFrameLength() const;
+
+ // The (hopefully) MPEG resource.
+ MediaResourceIndex mSource;
+
+ // MPEG frame parser used to detect frames and extract side info.
+ FrameParser mParser;
+
+ // Current byte offset in the source stream.
+ int64_t mOffset;
+
+ // Byte offset of the begin of the first frame, or 0 if none parsed yet.
+ int64_t mFirstFrameOffset;
+
+ // Total parsed frames.
+ uint64_t mNumParsedFrames;
+
+ // Current frame index.
+ int64_t mFrameIndex;
+
+ // Sum of parsed frames' lengths in bytes.
+ uint64_t mTotalFrameLen;
+
+ // Samples per frame metric derived from frame headers or 0 if none available.
+ int32_t mSamplesPerFrame;
+
+ // Samples per second metric derived from frame headers or 0 if none available.
+ int32_t mSamplesPerSecond;
+
+ // Channel count derived from frame headers or 0 if none available.
+ int32_t mChannels;
+
+ // Audio track config info.
+ UniquePtr<AudioInfo> mInfo;
+};
+
+} // namespace mozilla
+
+#endif
diff --git a/dom/media/mp3/moz.build b/dom/media/mp3/moz.build
new file mode 100644
index 000000000..596d061f8
--- /dev/null
+++ b/dom/media/mp3/moz.build
@@ -0,0 +1,17 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+EXPORTS += [
+ 'MP3Decoder.h',
+ 'MP3Demuxer.h',
+]
+
+UNIFIED_SOURCES += [
+ 'MP3Decoder.cpp',
+ 'MP3Demuxer.cpp',
+]
+
+FINAL_LIBRARY = 'xul'
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 16:10:44 +0000