зеркало из https://github.com/mozilla/gecko-dev.git
1257 строки
35 KiB
C++
1257 строки
35 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "MP3Demuxer.h"
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#include <inttypes.h>
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#include <algorithm>
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#include "mozilla/Assertions.h"
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#include "mozilla/Endian.h"
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#include "VideoUtils.h"
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#include "TimeUnits.h"
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#include "prenv.h"
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#ifdef PR_LOGGING
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mozilla::LazyLogModule gMP3DemuxerLog("MP3Demuxer");
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#define MP3LOG(msg, ...) \
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MOZ_LOG(gMP3DemuxerLog, LogLevel::Debug, ("MP3Demuxer " msg, ##__VA_ARGS__))
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#define MP3LOGV(msg, ...) \
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MOZ_LOG(gMP3DemuxerLog, LogLevel::Verbose, ("MP3Demuxer " msg, ##__VA_ARGS__))
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#else
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#define MP3LOG(msg, ...)
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#define MP3LOGV(msg, ...)
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#endif
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using mozilla::media::TimeUnit;
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using mozilla::media::TimeIntervals;
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using mp4_demuxer::ByteReader;
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namespace mozilla {
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namespace mp3 {
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// MP3Demuxer
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MP3Demuxer::MP3Demuxer(MediaResource* aSource)
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: mSource(aSource)
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{}
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bool
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MP3Demuxer::InitInternal() {
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if (!mTrackDemuxer) {
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mTrackDemuxer = new MP3TrackDemuxer(mSource);
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}
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return mTrackDemuxer->Init();
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}
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RefPtr<MP3Demuxer::InitPromise>
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MP3Demuxer::Init() {
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if (!InitInternal()) {
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MP3LOG("MP3Demuxer::Init() failure: waiting for data");
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return InitPromise::CreateAndReject(
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DemuxerFailureReason::DEMUXER_ERROR, __func__);
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}
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MP3LOG("MP3Demuxer::Init() successful");
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return InitPromise::CreateAndResolve(NS_OK, __func__);
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}
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bool
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MP3Demuxer::HasTrackType(TrackInfo::TrackType aType) const {
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return aType == TrackInfo::kAudioTrack;
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}
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uint32_t
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MP3Demuxer::GetNumberTracks(TrackInfo::TrackType aType) const {
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return aType == TrackInfo::kAudioTrack ? 1u : 0u;
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}
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already_AddRefed<MediaTrackDemuxer>
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MP3Demuxer::GetTrackDemuxer(TrackInfo::TrackType aType, uint32_t aTrackNumber) {
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if (!mTrackDemuxer) {
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return nullptr;
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}
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return RefPtr<MP3TrackDemuxer>(mTrackDemuxer).forget();
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}
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bool
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MP3Demuxer::IsSeekable() const {
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return true;
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}
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void
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MP3Demuxer::NotifyDataArrived() {
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// TODO: bug 1169485.
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NS_WARNING("Unimplemented function NotifyDataArrived");
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MP3LOGV("NotifyDataArrived()");
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}
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void
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MP3Demuxer::NotifyDataRemoved() {
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// TODO: bug 1169485.
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NS_WARNING("Unimplemented function NotifyDataRemoved");
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MP3LOGV("NotifyDataRemoved()");
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}
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// MP3TrackDemuxer
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MP3TrackDemuxer::MP3TrackDemuxer(MediaResource* aSource)
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: mSource(aSource)
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, mOffset(0)
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, mFirstFrameOffset(0)
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, mNumParsedFrames(0)
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, mFrameIndex(0)
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, mTotalFrameLen(0)
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, mSamplesPerFrame(0)
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, mSamplesPerSecond(0)
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, mChannels(0)
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{
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Reset();
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}
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bool
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MP3TrackDemuxer::Init() {
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Reset();
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FastSeek(TimeUnit());
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// Read the first frame to fetch sample rate and other meta data.
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RefPtr<MediaRawData> frame(GetNextFrame(FindNextFrame()));
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MP3LOG("Init StreamLength()=%" PRId64 " first-frame-found=%d",
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StreamLength(), !!frame);
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if (!frame) {
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return false;
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}
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// Rewind back to the stream begin to avoid dropping the first frame.
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FastSeek(TimeUnit());
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if (!mInfo) {
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mInfo = MakeUnique<AudioInfo>();
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}
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mInfo->mRate = mSamplesPerSecond;
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mInfo->mChannels = mChannels;
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mInfo->mBitDepth = 16;
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mInfo->mMimeType = "audio/mpeg";
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mInfo->mDuration = Duration().ToMicroseconds();
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MP3LOG("Init mInfo={mRate=%d mChannels=%d mBitDepth=%d mDuration=%" PRId64 "}",
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mInfo->mRate, mInfo->mChannels, mInfo->mBitDepth,
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mInfo->mDuration);
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return mSamplesPerSecond && mChannels;
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}
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media::TimeUnit
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MP3TrackDemuxer::SeekPosition() const {
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TimeUnit pos = Duration(mFrameIndex);
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if (Duration() > TimeUnit()) {
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pos = std::min(Duration(), pos);
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}
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return pos;
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}
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#ifdef ENABLE_TESTS
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const FrameParser::Frame&
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MP3TrackDemuxer::LastFrame() const {
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return mParser.PrevFrame();
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}
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RefPtr<MediaRawData>
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MP3TrackDemuxer::DemuxSample() {
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return GetNextFrame(FindNextFrame());
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}
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#endif
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const ID3Parser::ID3Header&
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MP3TrackDemuxer::ID3Header() const {
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return mParser.ID3Header();
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}
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const FrameParser::VBRHeader&
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MP3TrackDemuxer::VBRInfo() const {
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return mParser.VBRInfo();
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}
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UniquePtr<TrackInfo>
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MP3TrackDemuxer::GetInfo() const {
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return mInfo->Clone();
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}
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RefPtr<MP3TrackDemuxer::SeekPromise>
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MP3TrackDemuxer::Seek(TimeUnit aTime) {
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// Efficiently seek to the position.
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FastSeek(aTime);
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// Correct seek position by scanning the next frames.
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const TimeUnit seekTime = ScanUntil(aTime);
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return SeekPromise::CreateAndResolve(seekTime, __func__);
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}
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TimeUnit
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MP3TrackDemuxer::FastSeek(const TimeUnit& aTime) {
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MP3LOG("FastSeek(%" PRId64 ") avgFrameLen=%f mNumParsedFrames=%" PRIu64
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" mFrameIndex=%" PRId64 " mOffset=%" PRIu64,
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aTime, AverageFrameLength(), mNumParsedFrames, mFrameIndex, mOffset);
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const auto& vbr = mParser.VBRInfo();
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if (!aTime.ToMicroseconds()) {
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// Quick seek to the beginning of the stream.
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mFrameIndex = 0;
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} else if (vbr.IsTOCPresent()) {
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// Use TOC for more precise seeking.
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const float durationFrac = static_cast<float>(aTime.ToMicroseconds()) /
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Duration().ToMicroseconds();
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mFrameIndex = FrameIndexFromOffset(vbr.Offset(durationFrac));
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} else if (AverageFrameLength() > 0) {
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mFrameIndex = FrameIndexFromTime(aTime);
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}
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mOffset = OffsetFromFrameIndex(mFrameIndex);
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if (mOffset > mFirstFrameOffset && StreamLength() > 0) {
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mOffset = std::min(StreamLength() - 1, mOffset);
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}
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mParser.EndFrameSession();
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MP3LOG("FastSeek End TOC=%d avgFrameLen=%f mNumParsedFrames=%" PRIu64
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" mFrameIndex=%" PRId64 " mFirstFrameOffset=%llu mOffset=%" PRIu64
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" SL=%llu NumBytes=%u",
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vbr.IsTOCPresent(), AverageFrameLength(), mNumParsedFrames, mFrameIndex,
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mFirstFrameOffset, mOffset, StreamLength(), vbr.NumBytes().valueOr(0));
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return Duration(mFrameIndex);
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}
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TimeUnit
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MP3TrackDemuxer::ScanUntil(const TimeUnit& aTime) {
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MP3LOG("ScanUntil(%" PRId64 ") avgFrameLen=%f mNumParsedFrames=%" PRIu64
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" mFrameIndex=%" PRId64 " mOffset=%" PRIu64,
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aTime, AverageFrameLength(), mNumParsedFrames, mFrameIndex, mOffset);
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if (!aTime.ToMicroseconds()) {
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return FastSeek(aTime);
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}
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if (Duration(mFrameIndex) > aTime) {
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FastSeek(aTime);
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}
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if (Duration(mFrameIndex + 1) > aTime) {
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return SeekPosition();
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}
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MediaByteRange nextRange = FindNextFrame();
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while (SkipNextFrame(nextRange) && Duration(mFrameIndex + 1) < aTime) {
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nextRange = FindNextFrame();
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MP3LOGV("ScanUntil* avgFrameLen=%f mNumParsedFrames=%" PRIu64
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" mFrameIndex=%" PRId64 " mOffset=%" PRIu64 " Duration=%" PRId64,
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aTime, AverageFrameLength(), mNumParsedFrames, mFrameIndex,
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mOffset, Duration(mFrameIndex + 1));
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}
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MP3LOG("ScanUntil End avgFrameLen=%f mNumParsedFrames=%" PRIu64
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" mFrameIndex=%" PRId64 " mOffset=%" PRIu64,
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aTime, AverageFrameLength(), mNumParsedFrames, mFrameIndex, mOffset);
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return SeekPosition();
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}
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RefPtr<MP3TrackDemuxer::SamplesPromise>
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MP3TrackDemuxer::GetSamples(int32_t aNumSamples) {
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MP3LOGV("GetSamples(%d) Begin mOffset=%" PRIu64 " mNumParsedFrames=%" PRIu64
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" mFrameIndex=%" PRId64 " mTotalFrameLen=%" PRIu64 " mSamplesPerFrame=%d "
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"mSamplesPerSecond=%d mChannels=%d",
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aNumSamples, mOffset, mNumParsedFrames, mFrameIndex, mTotalFrameLen,
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mSamplesPerFrame, mSamplesPerSecond, mChannels);
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if (!aNumSamples) {
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return SamplesPromise::CreateAndReject(
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DemuxerFailureReason::DEMUXER_ERROR, __func__);
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}
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RefPtr<SamplesHolder> frames = new SamplesHolder();
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while (aNumSamples--) {
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RefPtr<MediaRawData> frame(GetNextFrame(FindNextFrame()));
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if (!frame) {
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break;
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}
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frames->mSamples.AppendElement(frame);
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}
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MP3LOGV("GetSamples() End mSamples.Size()=%d aNumSamples=%d mOffset=%" PRIu64
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" mNumParsedFrames=%" PRIu64 " mFrameIndex=%" PRId64
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" mTotalFrameLen=%" PRIu64 " mSamplesPerFrame=%d mSamplesPerSecond=%d "
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"mChannels=%d",
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frames->mSamples.Length(), aNumSamples, mOffset, mNumParsedFrames,
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mFrameIndex, mTotalFrameLen, mSamplesPerFrame, mSamplesPerSecond,
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mChannels);
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if (frames->mSamples.IsEmpty()) {
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return SamplesPromise::CreateAndReject(
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DemuxerFailureReason::END_OF_STREAM, __func__);
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}
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return SamplesPromise::CreateAndResolve(frames, __func__);
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}
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void
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MP3TrackDemuxer::Reset() {
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MP3LOG("Reset()");
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FastSeek(TimeUnit());
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mParser.Reset();
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}
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RefPtr<MP3TrackDemuxer::SkipAccessPointPromise>
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MP3TrackDemuxer::SkipToNextRandomAccessPoint(TimeUnit aTimeThreshold) {
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// Will not be called for audio-only resources.
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return SkipAccessPointPromise::CreateAndReject(
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SkipFailureHolder(DemuxerFailureReason::DEMUXER_ERROR, 0), __func__);
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}
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int64_t
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MP3TrackDemuxer::GetResourceOffset() const {
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return mOffset;
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}
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TimeIntervals
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MP3TrackDemuxer::GetBuffered() {
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TimeUnit duration = Duration();
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if (duration <= TimeUnit()) {
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return TimeIntervals();
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}
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AutoPinned<MediaResource> stream(mSource.GetResource());
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return GetEstimatedBufferedTimeRanges(stream, duration.ToMicroseconds());
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}
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int64_t
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MP3TrackDemuxer::StreamLength() const {
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return mSource.GetLength();
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}
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TimeUnit
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MP3TrackDemuxer::Duration() const {
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if (!mNumParsedFrames) {
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return TimeUnit::FromMicroseconds(-1);
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}
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int64_t numFrames = 0;
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const auto numAudioFrames = mParser.VBRInfo().NumAudioFrames();
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if (numAudioFrames) {
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// VBR headers don't include the VBR header frame.
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numFrames = numAudioFrames.value() + 1;
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} else {
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const int64_t streamLen = StreamLength();
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if (streamLen < 0) {
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// Unknown length, we can't estimate duration.
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return TimeUnit::FromMicroseconds(-1);
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}
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numFrames = (streamLen - mFirstFrameOffset) / AverageFrameLength();
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}
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return Duration(numFrames);
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}
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TimeUnit
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MP3TrackDemuxer::Duration(int64_t aNumFrames) const {
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if (!mSamplesPerSecond) {
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return TimeUnit::FromMicroseconds(-1);
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}
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const double usPerFrame = USECS_PER_S * mSamplesPerFrame / mSamplesPerSecond;
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return TimeUnit::FromMicroseconds(aNumFrames * usPerFrame);
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}
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static bool
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VerifyFrameConsistency(
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const FrameParser::Frame& aFrame1, const FrameParser::Frame& aFrame2) {
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const auto& h1 = aFrame1.Header();
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const auto& h2 = aFrame2.Header();
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return h1.IsValid() && h2.IsValid() &&
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h1.Layer() == h2.Layer() &&
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h1.SlotSize() == h2.SlotSize() &&
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h1.SamplesPerFrame() == h2.SamplesPerFrame() &&
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h1.Channels() == h2.Channels() &&
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h1.SampleRate() == h2.SampleRate() &&
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h1.RawVersion() == h2.RawVersion() &&
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h1.RawProtection() == h2.RawProtection();
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}
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MediaByteRange
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MP3TrackDemuxer::FindNextFrame() {
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static const int BUFFER_SIZE = 64;
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static const int MAX_SKIPPED_BYTES = 1024 * BUFFER_SIZE;
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MP3LOGV("FindNext() Begin mOffset=%" PRIu64 " mNumParsedFrames=%" PRIu64
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" mFrameIndex=%" PRId64 " mTotalFrameLen=%" PRIu64
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" mSamplesPerFrame=%d mSamplesPerSecond=%d mChannels=%d",
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mOffset, mNumParsedFrames, mFrameIndex, mTotalFrameLen,
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mSamplesPerFrame, mSamplesPerSecond, mChannels);
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uint8_t buffer[BUFFER_SIZE];
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int32_t read = 0;
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bool foundFrame = false;
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int64_t frameHeaderOffset = 0;
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// Check whether we've found a valid MPEG frame.
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while (!foundFrame) {
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if ((!mParser.FirstFrame().Length() &&
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mOffset - mParser.ID3Header().Size() > MAX_SKIPPED_BYTES) ||
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(read = Read(buffer, mOffset, BUFFER_SIZE)) == 0) {
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MP3LOG("FindNext() EOS or exceeded MAX_SKIPPED_BYTES without a frame");
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// This is not a valid MPEG audio stream or we've reached EOS, give up.
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break;
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}
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ByteReader reader(buffer, read);
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uint32_t bytesToSkip = 0;
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foundFrame = mParser.Parse(&reader, &bytesToSkip);
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frameHeaderOffset = mOffset + reader.Offset() - FrameParser::FrameHeader::SIZE;
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// If we've found neither an MPEG frame header nor an ID3v2 tag,
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// the reader shouldn't have any bytes remaining.
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MOZ_ASSERT(foundFrame || bytesToSkip || !reader.Remaining());
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reader.DiscardRemaining();
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if (foundFrame && mParser.FirstFrame().Length() &&
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!VerifyFrameConsistency(mParser.FirstFrame(), mParser.CurrentFrame())) {
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// We've likely hit a false-positive, ignore it and proceed with the
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// search for the next valid frame.
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foundFrame = false;
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mOffset = frameHeaderOffset + 1;
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mParser.EndFrameSession();
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} else {
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// Advance mOffset by the amount of bytes read and if necessary,
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// skip an ID3v2 tag which stretches beyond the current buffer.
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NS_ENSURE_TRUE(mOffset + read + bytesToSkip > mOffset,
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MediaByteRange(0, 0));
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mOffset += read + bytesToSkip;
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}
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}
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if (!foundFrame || !mParser.CurrentFrame().Length()) {
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MP3LOG("FindNext() Exit foundFrame=%d mParser.CurrentFrame().Length()=%d ",
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foundFrame, mParser.CurrentFrame().Length());
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return { 0, 0 };
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}
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MP3LOGV("FindNext() End mOffset=%" PRIu64 " mNumParsedFrames=%" PRIu64
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" mFrameIndex=%" PRId64 " frameHeaderOffset=%d"
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" mTotalFrameLen=%" PRIu64 " mSamplesPerFrame=%d mSamplesPerSecond=%d"
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" mChannels=%d",
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mOffset, mNumParsedFrames, mFrameIndex, frameHeaderOffset,
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mTotalFrameLen, mSamplesPerFrame, mSamplesPerSecond, mChannels);
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return { frameHeaderOffset, frameHeaderOffset + mParser.CurrentFrame().Length() };
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}
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bool
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MP3TrackDemuxer::SkipNextFrame(const MediaByteRange& aRange) {
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if (!mNumParsedFrames || !aRange.Length()) {
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// We can't skip the first frame, since it could contain VBR headers.
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RefPtr<MediaRawData> frame(GetNextFrame(aRange));
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return frame;
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}
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UpdateState(aRange);
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MP3LOGV("SkipNext() End mOffset=%" PRIu64 " mNumParsedFrames=%" PRIu64
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" mFrameIndex=%" PRId64 " mTotalFrameLen=%" PRIu64
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" mSamplesPerFrame=%d mSamplesPerSecond=%d mChannels=%d",
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mOffset, mNumParsedFrames, mFrameIndex, mTotalFrameLen,
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mSamplesPerFrame, mSamplesPerSecond, mChannels);
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return true;
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}
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already_AddRefed<MediaRawData>
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MP3TrackDemuxer::GetNextFrame(const MediaByteRange& aRange) {
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MP3LOG("GetNext() Begin({mStart=%" PRId64 " Length()=%" PRId64 "})",
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aRange.mStart, aRange.Length());
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if (!aRange.Length()) {
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return nullptr;
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}
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RefPtr<MediaRawData> frame = new MediaRawData();
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frame->mOffset = aRange.mStart;
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nsAutoPtr<MediaRawDataWriter> frameWriter(frame->CreateWriter());
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if (!frameWriter->SetSize(aRange.Length())) {
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MP3LOG("GetNext() Exit failed to allocated media buffer");
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return nullptr;
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}
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const uint32_t read = Read(frameWriter->Data(), frame->mOffset, frame->Size());
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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.
|
|
// TODO: read info that helps with seeking (bug 1163667).
|
|
ByteReader reader(frame->Data(), frame->Size());
|
|
mParser.ParseVBRHeader(&reader);
|
|
reader.DiscardRemaining();
|
|
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.NumBytes() && vbr.NumAudioFrames()) {
|
|
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.NumBytes() && vbr.NumAudioFrames()) {
|
|
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.NumBytes() && vbr.NumAudioFrames()) {
|
|
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::EndFrameSession() {
|
|
if (!mID3Parser.Header().IsValid()) {
|
|
// Reset ID3 tags only if we have not parsed a valid ID3 header yet.
|
|
mID3Parser.Reset();
|
|
}
|
|
#ifdef ENABLE_TESTS
|
|
mPrevFrame = mFrame;
|
|
#endif
|
|
mFrame.Reset();
|
|
}
|
|
|
|
const FrameParser::Frame&
|
|
FrameParser::CurrentFrame() const {
|
|
return mFrame;
|
|
}
|
|
|
|
#ifdef ENABLE_TESTS
|
|
const FrameParser::Frame&
|
|
FrameParser::PrevFrame() const {
|
|
return mPrevFrame;
|
|
}
|
|
#endif
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
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 mp3
|
|
} // namespace mozilla
|