| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "media/formats/mp4/mp4_stream_parser.h" |
| |
| #include "base/callback.h" |
| #include "base/callback_helpers.h" |
| #include "base/logging.h" |
| #include "base/time/time.h" |
| #include "media/base/audio_decoder_config.h" |
| #include "media/base/stream_parser_buffer.h" |
| #include "media/base/text_track_config.h" |
| #include "media/base/video_decoder_config.h" |
| #include "media/base/video_util.h" |
| #include "media/formats/mp4/box_definitions.h" |
| #include "media/formats/mp4/box_reader.h" |
| #include "media/formats/mp4/es_descriptor.h" |
| #include "media/formats/mp4/rcheck.h" |
| #include "media/formats/mpeg/adts_constants.h" |
| |
| namespace media { |
| namespace mp4 { |
| |
| // TODO(xhwang): Figure out the init data type appropriately once it's spec'ed. |
| static const char kMp4InitDataType[] = "video/mp4"; |
| |
| MP4StreamParser::MP4StreamParser(const std::set<int>& audio_object_types, |
| bool has_sbr) |
| : state_(kWaitingForInit), |
| moof_head_(0), |
| mdat_tail_(0), |
| has_audio_(false), |
| has_video_(false), |
| audio_track_id_(0), |
| video_track_id_(0), |
| audio_object_types_(audio_object_types), |
| has_sbr_(has_sbr), |
| is_audio_track_encrypted_(false), |
| is_video_track_encrypted_(false) { |
| } |
| |
| MP4StreamParser::~MP4StreamParser() {} |
| |
| void MP4StreamParser::Init(const InitCB& init_cb, |
| const NewConfigCB& config_cb, |
| const NewBuffersCB& new_buffers_cb, |
| bool /* ignore_text_tracks */ , |
| const NeedKeyCB& need_key_cb, |
| const NewMediaSegmentCB& new_segment_cb, |
| const base::Closure& end_of_segment_cb, |
| const LogCB& log_cb) { |
| DCHECK_EQ(state_, kWaitingForInit); |
| DCHECK(init_cb_.is_null()); |
| DCHECK(!init_cb.is_null()); |
| DCHECK(!config_cb.is_null()); |
| DCHECK(!new_buffers_cb.is_null()); |
| DCHECK(!need_key_cb.is_null()); |
| DCHECK(!end_of_segment_cb.is_null()); |
| |
| ChangeState(kParsingBoxes); |
| init_cb_ = init_cb; |
| config_cb_ = config_cb; |
| new_buffers_cb_ = new_buffers_cb; |
| need_key_cb_ = need_key_cb; |
| new_segment_cb_ = new_segment_cb; |
| end_of_segment_cb_ = end_of_segment_cb; |
| log_cb_ = log_cb; |
| } |
| |
| void MP4StreamParser::Reset() { |
| queue_.Reset(); |
| runs_.reset(); |
| moof_head_ = 0; |
| mdat_tail_ = 0; |
| } |
| |
| void MP4StreamParser::Flush() { |
| DCHECK_NE(state_, kWaitingForInit); |
| Reset(); |
| ChangeState(kParsingBoxes); |
| } |
| |
| bool MP4StreamParser::Parse(const uint8* buf, int size) { |
| DCHECK_NE(state_, kWaitingForInit); |
| |
| if (state_ == kError) |
| return false; |
| |
| queue_.Push(buf, size); |
| |
| BufferQueue audio_buffers; |
| BufferQueue video_buffers; |
| |
| bool result = false; |
| bool err = false; |
| |
| do { |
| switch (state_) { |
| case kWaitingForInit: |
| case kError: |
| NOTREACHED(); |
| return false; |
| |
| case kParsingBoxes: |
| result = ParseBox(&err); |
| break; |
| |
| case kWaitingForSampleData: |
| result = HaveEnoughDataToEnqueueSamples(); |
| if (result) |
| ChangeState(kEmittingSamples); |
| break; |
| |
| case kEmittingSamples: |
| result = EnqueueSample(&audio_buffers, &video_buffers, &err); |
| if (result) { |
| int64 max_clear = runs_->GetMaxClearOffset() + moof_head_; |
| err = !ReadAndDiscardMDATsUntil(max_clear); |
| } |
| break; |
| } |
| } while (result && !err); |
| |
| if (!err) |
| err = !SendAndFlushSamples(&audio_buffers, &video_buffers); |
| |
| if (err) { |
| DLOG(ERROR) << "Error while parsing MP4"; |
| moov_.reset(); |
| Reset(); |
| ChangeState(kError); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool MP4StreamParser::ParseBox(bool* err) { |
| const uint8* buf; |
| int size; |
| queue_.Peek(&buf, &size); |
| if (!size) return false; |
| |
| scoped_ptr<BoxReader> reader( |
| BoxReader::ReadTopLevelBox(buf, size, log_cb_, err)); |
| if (reader.get() == NULL) return false; |
| |
| if (reader->type() == FOURCC_MOOV) { |
| *err = !ParseMoov(reader.get()); |
| } else if (reader->type() == FOURCC_MOOF) { |
| moof_head_ = queue_.head(); |
| *err = !ParseMoof(reader.get()); |
| |
| // Set up first mdat offset for ReadMDATsUntil(). |
| mdat_tail_ = queue_.head() + reader->size(); |
| |
| // Return early to avoid evicting 'moof' data from queue. Auxiliary info may |
| // be located anywhere in the file, including inside the 'moof' itself. |
| // (Since 'default-base-is-moof' is mandated, no data references can come |
| // before the head of the 'moof', so keeping this box around is sufficient.) |
| return !(*err); |
| } else { |
| MEDIA_LOG(log_cb_) << "Skipping unrecognized top-level box: " |
| << FourCCToString(reader->type()); |
| } |
| |
| queue_.Pop(reader->size()); |
| return !(*err); |
| } |
| |
| |
| bool MP4StreamParser::ParseMoov(BoxReader* reader) { |
| moov_.reset(new Movie); |
| RCHECK(moov_->Parse(reader)); |
| runs_.reset(); |
| |
| has_audio_ = false; |
| has_video_ = false; |
| |
| AudioDecoderConfig audio_config; |
| VideoDecoderConfig video_config; |
| |
| for (std::vector<Track>::const_iterator track = moov_->tracks.begin(); |
| track != moov_->tracks.end(); ++track) { |
| // TODO(strobe): Only the first audio and video track present in a file are |
| // used. (Track selection is better accomplished via Source IDs, though, so |
| // adding support for track selection within a stream is low-priority.) |
| const SampleDescription& samp_descr = |
| track->media.information.sample_table.description; |
| |
| // TODO(strobe): When codec reconfigurations are supported, detect and send |
| // a codec reconfiguration for fragments using a sample description index |
| // different from the previous one |
| size_t desc_idx = 0; |
| for (size_t t = 0; t < moov_->extends.tracks.size(); t++) { |
| const TrackExtends& trex = moov_->extends.tracks[t]; |
| if (trex.track_id == track->header.track_id) { |
| desc_idx = trex.default_sample_description_index; |
| break; |
| } |
| } |
| RCHECK(desc_idx > 0); |
| desc_idx -= 1; // BMFF descriptor index is one-based |
| |
| if (track->media.handler.type == kAudio && !audio_config.IsValidConfig()) { |
| RCHECK(!samp_descr.audio_entries.empty()); |
| |
| // It is not uncommon to find otherwise-valid files with incorrect sample |
| // description indices, so we fail gracefully in that case. |
| if (desc_idx >= samp_descr.audio_entries.size()) |
| desc_idx = 0; |
| const AudioSampleEntry& entry = samp_descr.audio_entries[desc_idx]; |
| const AAC& aac = entry.esds.aac; |
| |
| if (!(entry.format == FOURCC_MP4A || |
| (entry.format == FOURCC_ENCA && |
| entry.sinf.format.format == FOURCC_MP4A))) { |
| MEDIA_LOG(log_cb_) << "Unsupported audio format 0x" |
| << std::hex << entry.format << " in stsd box."; |
| return false; |
| } |
| |
| uint8 audio_type = entry.esds.object_type; |
| DVLOG(1) << "audio_type " << std::hex << static_cast<int>(audio_type); |
| if (audio_object_types_.find(audio_type) == audio_object_types_.end()) { |
| MEDIA_LOG(log_cb_) << "audio object type 0x" << std::hex << audio_type |
| << " does not match what is specified in the" |
| << " mimetype."; |
| return false; |
| } |
| |
| AudioCodec codec = kUnknownAudioCodec; |
| ChannelLayout channel_layout = CHANNEL_LAYOUT_NONE; |
| int sample_per_second = 0; |
| std::vector<uint8> extra_data; |
| // Check if it is MPEG4 AAC defined in ISO 14496 Part 3 or |
| // supported MPEG2 AAC varients. |
| if (ESDescriptor::IsAAC(audio_type)) { |
| codec = kCodecAAC; |
| channel_layout = aac.GetChannelLayout(has_sbr_); |
| sample_per_second = aac.GetOutputSamplesPerSecond(has_sbr_); |
| #if defined(OS_ANDROID) |
| extra_data = aac.codec_specific_data(); |
| #endif |
| } else { |
| MEDIA_LOG(log_cb_) << "Unsupported audio object type 0x" << std::hex |
| << audio_type << " in esds."; |
| return false; |
| } |
| |
| SampleFormat sample_format; |
| if (entry.samplesize == 8) { |
| sample_format = kSampleFormatU8; |
| } else if (entry.samplesize == 16) { |
| sample_format = kSampleFormatS16; |
| } else if (entry.samplesize == 32) { |
| sample_format = kSampleFormatS32; |
| } else { |
| LOG(ERROR) << "Unsupported sample size."; |
| return false; |
| } |
| |
| is_audio_track_encrypted_ = entry.sinf.info.track_encryption.is_encrypted; |
| DVLOG(1) << "is_audio_track_encrypted_: " << is_audio_track_encrypted_; |
| audio_config.Initialize( |
| codec, sample_format, channel_layout, sample_per_second, |
| extra_data.size() ? &extra_data[0] : NULL, extra_data.size(), |
| is_audio_track_encrypted_, false, base::TimeDelta(), |
| 0); |
| has_audio_ = true; |
| audio_track_id_ = track->header.track_id; |
| } |
| if (track->media.handler.type == kVideo && !video_config.IsValidConfig()) { |
| RCHECK(!samp_descr.video_entries.empty()); |
| if (desc_idx >= samp_descr.video_entries.size()) |
| desc_idx = 0; |
| const VideoSampleEntry& entry = samp_descr.video_entries[desc_idx]; |
| |
| if (!entry.IsFormatValid()) { |
| MEDIA_LOG(log_cb_) << "Unsupported video format 0x" |
| << std::hex << entry.format << " in stsd box."; |
| return false; |
| } |
| |
| // TODO(strobe): Recover correct crop box |
| gfx::Size coded_size(entry.width, entry.height); |
| gfx::Rect visible_rect(coded_size); |
| gfx::Size natural_size = GetNaturalSize(visible_rect.size(), |
| entry.pixel_aspect.h_spacing, |
| entry.pixel_aspect.v_spacing); |
| is_video_track_encrypted_ = entry.sinf.info.track_encryption.is_encrypted; |
| DVLOG(1) << "is_video_track_encrypted_: " << is_video_track_encrypted_; |
| video_config.Initialize(kCodecH264, H264PROFILE_MAIN, VideoFrame::YV12, |
| coded_size, visible_rect, natural_size, |
| // No decoder-specific buffer needed for AVC; |
| // SPS/PPS are embedded in the video stream |
| NULL, 0, is_video_track_encrypted_, false); |
| has_video_ = true; |
| video_track_id_ = track->header.track_id; |
| } |
| } |
| |
| RCHECK(config_cb_.Run(audio_config, video_config, TextTrackConfigMap())); |
| |
| StreamParser::InitParameters params(kInfiniteDuration()); |
| if (moov_->extends.header.fragment_duration > 0) { |
| params.duration = TimeDeltaFromRational( |
| moov_->extends.header.fragment_duration, moov_->header.timescale); |
| } else if (moov_->header.duration > 0 && |
| moov_->header.duration != kuint64max) { |
| params.duration = |
| TimeDeltaFromRational(moov_->header.duration, moov_->header.timescale); |
| } |
| |
| if (!init_cb_.is_null()) |
| base::ResetAndReturn(&init_cb_).Run(true, params); |
| |
| EmitNeedKeyIfNecessary(moov_->pssh); |
| return true; |
| } |
| |
| bool MP4StreamParser::ParseMoof(BoxReader* reader) { |
| RCHECK(moov_.get()); // Must already have initialization segment |
| MovieFragment moof; |
| RCHECK(moof.Parse(reader)); |
| if (!runs_) |
| runs_.reset(new TrackRunIterator(moov_.get(), log_cb_)); |
| RCHECK(runs_->Init(moof)); |
| RCHECK(ComputeHighestEndOffset(moof)); |
| EmitNeedKeyIfNecessary(moof.pssh); |
| new_segment_cb_.Run(); |
| ChangeState(kWaitingForSampleData); |
| return true; |
| } |
| |
| void MP4StreamParser::EmitNeedKeyIfNecessary( |
| const std::vector<ProtectionSystemSpecificHeader>& headers) { |
| // TODO(strobe): ensure that the value of init_data (all PSSH headers |
| // concatenated in arbitrary order) matches the EME spec. |
| // See https://www.w3.org/Bugs/Public/show_bug.cgi?id=17673. |
| if (headers.empty()) |
| return; |
| |
| size_t total_size = 0; |
| for (size_t i = 0; i < headers.size(); i++) |
| total_size += headers[i].raw_box.size(); |
| |
| std::vector<uint8> init_data(total_size); |
| size_t pos = 0; |
| for (size_t i = 0; i < headers.size(); i++) { |
| memcpy(&init_data[pos], &headers[i].raw_box[0], |
| headers[i].raw_box.size()); |
| pos += headers[i].raw_box.size(); |
| } |
| need_key_cb_.Run(kMp4InitDataType, init_data); |
| } |
| |
| bool MP4StreamParser::PrepareAVCBuffer( |
| const AVCDecoderConfigurationRecord& avc_config, |
| std::vector<uint8>* frame_buf, |
| std::vector<SubsampleEntry>* subsamples) const { |
| // Convert the AVC NALU length fields to Annex B headers, as expected by |
| // decoding libraries. Since this may enlarge the size of the buffer, we also |
| // update the clear byte count for each subsample if encryption is used to |
| // account for the difference in size between the length prefix and Annex B |
| // start code. |
| RCHECK(AVC::ConvertFrameToAnnexB(avc_config.length_size, frame_buf)); |
| if (!subsamples->empty()) { |
| const int nalu_size_diff = 4 - avc_config.length_size; |
| size_t expected_size = runs_->sample_size() + |
| subsamples->size() * nalu_size_diff; |
| RCHECK(frame_buf->size() == expected_size); |
| for (size_t i = 0; i < subsamples->size(); i++) |
| (*subsamples)[i].clear_bytes += nalu_size_diff; |
| } |
| |
| if (runs_->is_keyframe()) { |
| // If this is a keyframe, we (re-)inject SPS and PPS headers at the start of |
| // a frame. If subsample info is present, we also update the clear byte |
| // count for that first subsample. |
| RCHECK(AVC::InsertParamSetsAnnexB(avc_config, frame_buf, subsamples)); |
| } |
| |
| // TODO(acolwell): Improve IsValidAnnexB() so it can handle encrypted content. |
| DCHECK(runs_->is_encrypted() || AVC::IsValidAnnexB(*frame_buf)); |
| return true; |
| } |
| |
| bool MP4StreamParser::PrepareAACBuffer( |
| const AAC& aac_config, std::vector<uint8>* frame_buf, |
| std::vector<SubsampleEntry>* subsamples) const { |
| // Append an ADTS header to every audio sample. |
| RCHECK(aac_config.ConvertEsdsToADTS(frame_buf)); |
| |
| // As above, adjust subsample information to account for the headers. AAC is |
| // not required to use subsample encryption, so we may need to add an entry. |
| if (subsamples->empty()) { |
| SubsampleEntry entry; |
| entry.clear_bytes = kADTSHeaderMinSize; |
| entry.cypher_bytes = frame_buf->size() - kADTSHeaderMinSize; |
| subsamples->push_back(entry); |
| } else { |
| (*subsamples)[0].clear_bytes += kADTSHeaderMinSize; |
| } |
| return true; |
| } |
| |
| bool MP4StreamParser::EnqueueSample(BufferQueue* audio_buffers, |
| BufferQueue* video_buffers, |
| bool* err) { |
| DCHECK_EQ(state_, kEmittingSamples); |
| |
| if (!runs_->IsRunValid()) { |
| // Flush any buffers we've gotten in this chunk so that buffers don't |
| // cross NewSegment() calls |
| *err = !SendAndFlushSamples(audio_buffers, video_buffers); |
| if (*err) |
| return false; |
| |
| // Remain in kEmittingSamples state, discarding data, until the end of |
| // the current 'mdat' box has been appended to the queue. |
| if (!queue_.Trim(mdat_tail_)) |
| return false; |
| |
| ChangeState(kParsingBoxes); |
| end_of_segment_cb_.Run(); |
| return true; |
| } |
| |
| if (!runs_->IsSampleValid()) { |
| runs_->AdvanceRun(); |
| return true; |
| } |
| |
| DCHECK(!(*err)); |
| |
| const uint8* buf; |
| int buf_size; |
| queue_.Peek(&buf, &buf_size); |
| if (!buf_size) return false; |
| |
| bool audio = has_audio_ && audio_track_id_ == runs_->track_id(); |
| bool video = has_video_ && video_track_id_ == runs_->track_id(); |
| |
| // Skip this entire track if it's not one we're interested in |
| if (!audio && !video) { |
| runs_->AdvanceRun(); |
| return true; |
| } |
| |
| // Attempt to cache the auxiliary information first. Aux info is usually |
| // placed in a contiguous block before the sample data, rather than being |
| // interleaved. If we didn't cache it, this would require that we retain the |
| // start of the segment buffer while reading samples. Aux info is typically |
| // quite small compared to sample data, so this pattern is useful on |
| // memory-constrained devices where the source buffer consumes a substantial |
| // portion of the total system memory. |
| if (runs_->AuxInfoNeedsToBeCached()) { |
| queue_.PeekAt(runs_->aux_info_offset() + moof_head_, &buf, &buf_size); |
| if (buf_size < runs_->aux_info_size()) return false; |
| *err = !runs_->CacheAuxInfo(buf, buf_size); |
| return !*err; |
| } |
| |
| queue_.PeekAt(runs_->sample_offset() + moof_head_, &buf, &buf_size); |
| if (buf_size < runs_->sample_size()) return false; |
| |
| scoped_ptr<DecryptConfig> decrypt_config; |
| std::vector<SubsampleEntry> subsamples; |
| if (runs_->is_encrypted()) { |
| decrypt_config = runs_->GetDecryptConfig(); |
| if (!decrypt_config) { |
| *err = true; |
| return false; |
| } |
| subsamples = decrypt_config->subsamples(); |
| } |
| |
| std::vector<uint8> frame_buf(buf, buf + runs_->sample_size()); |
| if (video) { |
| if (!PrepareAVCBuffer(runs_->video_description().avcc, |
| &frame_buf, &subsamples)) { |
| MEDIA_LOG(log_cb_) << "Failed to prepare AVC sample for decode"; |
| *err = true; |
| return false; |
| } |
| } |
| |
| if (audio) { |
| if (ESDescriptor::IsAAC(runs_->audio_description().esds.object_type) && |
| !PrepareAACBuffer(runs_->audio_description().esds.aac, |
| &frame_buf, &subsamples)) { |
| MEDIA_LOG(log_cb_) << "Failed to prepare AAC sample for decode"; |
| *err = true; |
| return false; |
| } |
| } |
| |
| if (decrypt_config) { |
| if (!subsamples.empty()) { |
| // Create a new config with the updated subsamples. |
| decrypt_config.reset(new DecryptConfig( |
| decrypt_config->key_id(), |
| decrypt_config->iv(), |
| subsamples)); |
| } |
| // else, use the existing config. |
| } else if ((audio && is_audio_track_encrypted_) || |
| (video && is_video_track_encrypted_)) { |
| // The media pipeline requires a DecryptConfig with an empty |iv|. |
| // TODO(ddorwin): Refactor so we do not need a fake key ID ("1"); |
| decrypt_config.reset( |
| new DecryptConfig("1", "", std::vector<SubsampleEntry>())); |
| } |
| |
| StreamParserBuffer::Type buffer_type = audio ? DemuxerStream::AUDIO : |
| DemuxerStream::VIDEO; |
| |
| // TODO(wolenetz/acolwell): Validate and use a common cross-parser TrackId |
| // type and allow multiple tracks for same media type, if applicable. See |
| // https://crbug.com/341581. |
| // |
| // NOTE: MPEG's "random access point" concept is equivalent to the |
| // downstream code's "is keyframe" concept. |
| scoped_refptr<StreamParserBuffer> stream_buf = |
| StreamParserBuffer::CopyFrom(&frame_buf[0], frame_buf.size(), |
| runs_->is_random_access_point(), |
| buffer_type, 0); |
| |
| if (decrypt_config) |
| stream_buf->set_decrypt_config(decrypt_config.Pass()); |
| |
| stream_buf->set_duration(runs_->duration()); |
| stream_buf->set_timestamp(runs_->cts()); |
| stream_buf->SetDecodeTimestamp(runs_->dts()); |
| |
| DVLOG(3) << "Pushing frame: aud=" << audio |
| << ", key=" << runs_->is_keyframe() |
| << ", rap=" << runs_->is_random_access_point() |
| << ", dur=" << runs_->duration().InMilliseconds() |
| << ", dts=" << runs_->dts().InMilliseconds() |
| << ", cts=" << runs_->cts().InMilliseconds() |
| << ", size=" << runs_->sample_size(); |
| |
| if (audio) { |
| audio_buffers->push_back(stream_buf); |
| } else { |
| video_buffers->push_back(stream_buf); |
| } |
| |
| runs_->AdvanceSample(); |
| return true; |
| } |
| |
| bool MP4StreamParser::SendAndFlushSamples(BufferQueue* audio_buffers, |
| BufferQueue* video_buffers) { |
| if (audio_buffers->empty() && video_buffers->empty()) |
| return true; |
| |
| TextBufferQueueMap empty_text_map; |
| bool success = new_buffers_cb_.Run(*audio_buffers, |
| *video_buffers, |
| empty_text_map); |
| audio_buffers->clear(); |
| video_buffers->clear(); |
| return success; |
| } |
| |
| bool MP4StreamParser::ReadAndDiscardMDATsUntil(int64 max_clear_offset) { |
| bool err = false; |
| int64 upper_bound = std::min(max_clear_offset, queue_.tail()); |
| while (mdat_tail_ < upper_bound) { |
| const uint8* buf = NULL; |
| int size = 0; |
| queue_.PeekAt(mdat_tail_, &buf, &size); |
| |
| FourCC type; |
| int box_sz; |
| if (!BoxReader::StartTopLevelBox(buf, size, log_cb_, |
| &type, &box_sz, &err)) |
| break; |
| |
| if (type != FOURCC_MDAT) { |
| MEDIA_LOG(log_cb_) << "Unexpected box type while parsing MDATs: " |
| << FourCCToString(type); |
| } |
| mdat_tail_ += box_sz; |
| } |
| queue_.Trim(std::min(mdat_tail_, upper_bound)); |
| return !err; |
| } |
| |
| void MP4StreamParser::ChangeState(State new_state) { |
| DVLOG(2) << "Changing state: " << new_state; |
| state_ = new_state; |
| } |
| |
| bool MP4StreamParser::HaveEnoughDataToEnqueueSamples() { |
| DCHECK_EQ(state_, kWaitingForSampleData); |
| // For muxed content, make sure we have data up to |highest_end_offset_| |
| // so we can ensure proper enqueuing behavior. Otherwise assume we have enough |
| // data and allow per sample offset checks to meter sample enqueuing. |
| // TODO(acolwell): Fix trun box handling so we don't have to special case |
| // muxed content. |
| return !(has_audio_ && has_video_ && |
| queue_.tail() < highest_end_offset_ + moof_head_); |
| } |
| |
| bool MP4StreamParser::ComputeHighestEndOffset(const MovieFragment& moof) { |
| highest_end_offset_ = 0; |
| |
| TrackRunIterator runs(moov_.get(), log_cb_); |
| RCHECK(runs.Init(moof)); |
| |
| while (runs.IsRunValid()) { |
| int64 aux_info_end_offset = runs.aux_info_offset() + runs.aux_info_size(); |
| if (aux_info_end_offset > highest_end_offset_) |
| highest_end_offset_ = aux_info_end_offset; |
| |
| while (runs.IsSampleValid()) { |
| int64 sample_end_offset = runs.sample_offset() + runs.sample_size(); |
| if (sample_end_offset > highest_end_offset_) |
| highest_end_offset_ = sample_end_offset; |
| |
| runs.AdvanceSample(); |
| } |
| runs.AdvanceRun(); |
| } |
| |
| return true; |
| } |
| |
| } // namespace mp4 |
| } // namespace media |