| // 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 "cobalt/media/formats/mp4/mp4_stream_parser.h" |
| |
| #include <algorithm> |
| #include <limits> |
| #include <memory> |
| #include <utility> |
| #include <vector> |
| |
| #include "base/callback_helpers.h" |
| #include "base/logging.h" |
| #include "base/strings/string_number_conversions.h" |
| #include "base/time/time.h" |
| #include "build/build_config.h" |
| #include "cobalt/media/base/audio_decoder_config.h" |
| #include "cobalt/media/base/color_space.h" |
| #include "cobalt/media/base/encryption_scheme.h" |
| #include "cobalt/media/base/hdr_metadata.h" |
| #include "cobalt/media/base/media_tracks.h" |
| #include "cobalt/media/base/media_util.h" |
| #include "cobalt/media/base/stream_parser_buffer.h" |
| #include "cobalt/media/base/text_track_config.h" |
| #include "cobalt/media/base/timestamp_constants.h" |
| #include "cobalt/media/base/video_decoder_config.h" |
| #include "cobalt/media/base/video_util.h" |
| #include "cobalt/media/formats/mp4/box_definitions.h" |
| #include "cobalt/media/formats/mp4/box_reader.h" |
| #include "cobalt/media/formats/mp4/es_descriptor.h" |
| #include "cobalt/media/formats/mp4/rcheck.h" |
| #include "cobalt/media/formats/mpeg/adts_constants.h" |
| #include "cobalt/media/formats/webm/webm_colour_parser.h" |
| #include "starboard/memory.h" |
| #include "starboard/types.h" |
| |
| namespace cobalt { |
| namespace media { |
| namespace mp4 { |
| |
| namespace { |
| |
| using gfx::ColorSpace; |
| |
| const int kMaxEmptySampleLogs = 20; |
| |
| // Caller should be prepared to handle return of Unencrypted() in case of |
| // unsupported scheme. |
| EncryptionScheme GetEncryptionScheme(const ProtectionSchemeInfo& sinf) { |
| if (!sinf.HasSupportedScheme()) return Unencrypted(); |
| FourCC fourcc = sinf.type.type; |
| EncryptionScheme::CipherMode mode = EncryptionScheme::CIPHER_MODE_UNENCRYPTED; |
| EncryptionPattern pattern; |
| bool uses_pattern_encryption = false; |
| switch (fourcc) { |
| case FOURCC_CENC: |
| mode = EncryptionScheme::CIPHER_MODE_AES_CTR; |
| break; |
| case FOURCC_CBCS: |
| mode = EncryptionScheme::CIPHER_MODE_AES_CBC; |
| uses_pattern_encryption = true; |
| break; |
| default: |
| NOTREACHED(); |
| break; |
| } |
| if (uses_pattern_encryption) { |
| pattern = {sinf.info.track_encryption.default_crypt_byte_block, |
| sinf.info.track_encryption.default_skip_byte_block}; |
| } |
| return EncryptionScheme(mode, pattern); |
| } |
| |
| gfx::ColorSpace ConvertColorParameterInformationToColorSpace( |
| const ColorParameterInformation& info) { |
| auto primary_id = static_cast<ColorSpace::PrimaryID>(info.colour_primaries); |
| auto transfer_id = |
| static_cast<ColorSpace::TransferID>(info.transfer_characteristics); |
| auto matrix_id = static_cast<ColorSpace::MatrixID>(info.matrix_coefficients); |
| |
| // Note that we don't check whether the embedded ids are valid. We rely on |
| // the underlying video decoder to reject any ids that it doesn't support. |
| return gfx::ColorSpace( |
| primary_id, transfer_id, matrix_id, |
| info.full_range ? ColorSpace::kRangeIdFull : ColorSpace::kRangeIdLimited); |
| } |
| |
| MasteringMetadata ConvertMdcvToMasteringMetadata( |
| const MasteringDisplayColorVolume& mdcv) { |
| MasteringMetadata mastering_metadata; |
| |
| mastering_metadata.primary_r_chromaticity_x = mdcv.display_primaries_rx; |
| mastering_metadata.primary_r_chromaticity_y = mdcv.display_primaries_ry; |
| mastering_metadata.primary_g_chromaticity_x = mdcv.display_primaries_gx; |
| mastering_metadata.primary_g_chromaticity_y = mdcv.display_primaries_gy; |
| mastering_metadata.primary_b_chromaticity_x = mdcv.display_primaries_bx; |
| mastering_metadata.primary_b_chromaticity_y = mdcv.display_primaries_by; |
| mastering_metadata.white_point_chromaticity_x = mdcv.white_point_x; |
| mastering_metadata.white_point_chromaticity_y = mdcv.white_point_y; |
| mastering_metadata.luminance_max = |
| static_cast<float>(mdcv.max_display_mastering_luminance); |
| mastering_metadata.luminance_min = |
| static_cast<float>(mdcv.min_display_mastering_luminance); |
| |
| return mastering_metadata; |
| } |
| |
| } // namespace |
| |
| MP4StreamParser::MP4StreamParser(DecoderBuffer::Allocator* buffer_allocator, |
| const std::set<int>& audio_object_types, |
| bool has_sbr) |
| : buffer_allocator_(buffer_allocator), |
| state_(kWaitingForInit), |
| moof_head_(0), |
| mdat_tail_(0), |
| highest_end_offset_(0), |
| has_audio_(false), |
| has_video_(false), |
| audio_object_types_(audio_object_types), |
| has_sbr_(has_sbr), |
| num_empty_samples_skipped_(0) {} |
| |
| MP4StreamParser::~MP4StreamParser() {} |
| |
| void MP4StreamParser::Init( |
| const InitCB& init_cb, const NewConfigCB& config_cb, |
| const NewBuffersCB& new_buffers_cb, bool ignore_text_tracks, |
| const EncryptedMediaInitDataCB& encrypted_media_init_data_cb, |
| const NewMediaSegmentCB& new_segment_cb, |
| const EndMediaSegmentCB& end_of_segment_cb, |
| const scoped_refptr<MediaLog>& media_log) { |
| 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(!encrypted_media_init_data_cb.is_null()); |
| DCHECK(!new_segment_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; |
| encrypted_media_init_data_cb_ = encrypted_media_init_data_cb; |
| new_segment_cb_ = new_segment_cb; |
| end_of_segment_cb_ = end_of_segment_cb; |
| media_log_ = media_log; |
| } |
| |
| 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_t* buf, int size) { |
| DCHECK_NE(state_, kWaitingForInit); |
| |
| if (state_ == kError) return false; |
| |
| queue_.Push(buf, size); |
| |
| BufferQueueMap 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(&buffers, &err); |
| if (result) { |
| int64_t max_clear = runs_->GetMaxClearOffset() + moof_head_; |
| err = !ReadAndDiscardMDATsUntil(max_clear); |
| } |
| break; |
| } |
| } while (result && !err); |
| |
| if (!err) err = !SendAndFlushSamples(&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_t* buf; |
| int size; |
| queue_.Peek(&buf, &size); |
| if (!size) return false; |
| |
| std::unique_ptr<BoxReader> reader( |
| BoxReader::ReadTopLevelBox(buf, size, media_log_, 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 { |
| // TODO(wolenetz,chcunningham): Enforce more strict adherence to MSE byte |
| // stream spec for ftyp and styp. See http://crbug.com/504514. |
| DVLOG(2) << "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(); |
| audio_track_ids_.clear(); |
| video_track_ids_.clear(); |
| is_track_encrypted_.clear(); |
| |
| has_audio_ = false; |
| has_video_ = false; |
| |
| std::unique_ptr<MediaTracks> media_tracks(new MediaTracks()); |
| AudioDecoderConfig audio_config; |
| VideoDecoderConfig video_config; |
| int detected_audio_track_count = 0; |
| int detected_video_track_count = 0; |
| int detected_text_track_count = 0; |
| |
| for (std::vector<Track>::const_iterator track = moov_->tracks.begin(); |
| track != moov_->tracks.end(); ++track) { |
| const SampleDescription& samp_descr = |
| track->media.information.sample_table.description; |
| |
| // TODO: 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) { |
| detected_audio_track_count++; |
| |
| 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; |
| |
| // For encrypted audio streams entry.format is FOURCC_ENCA and actual |
| // format is in entry.sinf.format.format. |
| FourCC audio_format = (entry.format == FOURCC_ENCA) |
| ? entry.sinf.format.format |
| : entry.format; |
| |
| if (audio_format != FOURCC_MP4A && audio_format != FOURCC_AC3 && |
| audio_format != FOURCC_EAC3) { |
| MEDIA_LOG(ERROR, media_log_) |
| << "Unsupported audio format 0x" << std::hex << entry.format |
| << " in stsd box."; |
| return false; |
| } |
| |
| uint8_t audio_type = entry.esds.object_type; |
| if (audio_type == kForbidden) { |
| if (audio_format == FOURCC_AC3) audio_type = kAC3; |
| if (audio_format == FOURCC_EAC3) audio_type = kEAC3; |
| } |
| DVLOG(1) << "audio_type 0x" << std::hex << static_cast<int>(audio_type); |
| if (audio_object_types_.find(audio_type) == audio_object_types_.end()) { |
| MEDIA_LOG(ERROR, media_log_) |
| << "audio object type 0x" << std::hex |
| << static_cast<int>(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_t> extra_data; |
| // Check if it is MPEG4 AAC defined in ISO 14496 Part 3 or |
| // supported MPEG2 AAC variants. |
| if (ESDescriptor::IsAAC(audio_type)) { |
| codec = kCodecAAC; |
| channel_layout = aac.GetChannelLayout(has_sbr_); |
| sample_per_second = aac.GetOutputSamplesPerSecond(has_sbr_); |
| extra_data = aac.codec_specific_data(); |
| } else if (audio_type == kAC3) { |
| codec = kCodecAC3; |
| channel_layout = GuessChannelLayout(entry.channelcount); |
| sample_per_second = entry.samplerate; |
| } else if (audio_type == kEAC3) { |
| codec = kCodecEAC3; |
| channel_layout = GuessChannelLayout(entry.channelcount); |
| sample_per_second = entry.samplerate; |
| } else { |
| MEDIA_LOG(ERROR, media_log_) |
| << "Unsupported audio object type 0x" << std::hex |
| << static_cast<int>(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 == 24) { |
| sample_format = kSampleFormatS24; |
| } else if (entry.samplesize == 32) { |
| sample_format = kSampleFormatS32; |
| } else { |
| LOG(ERROR) << "Unsupported sample size."; |
| return false; |
| } |
| |
| uint32_t audio_track_id = track->header.track_id; |
| if (audio_track_ids_.find(audio_track_id) != audio_track_ids_.end()) { |
| MEDIA_LOG(ERROR, media_log_) |
| << "Audio track with track_id=" << audio_track_id |
| << " already present."; |
| return false; |
| } |
| bool is_track_encrypted = entry.sinf.info.track_encryption.is_encrypted; |
| is_track_encrypted_[audio_track_id] = is_track_encrypted; |
| EncryptionScheme scheme = Unencrypted(); |
| if (is_track_encrypted) { |
| scheme = GetEncryptionScheme(entry.sinf); |
| if (!scheme.is_encrypted()) return false; |
| } |
| audio_config.Initialize(codec, sample_format, channel_layout, |
| sample_per_second, extra_data, scheme, |
| base::TimeDelta(), 0); |
| DVLOG(1) << "audio_track_id=" << audio_track_id |
| << " config=" << audio_config.AsHumanReadableString(); |
| if (!audio_config.IsValidConfig()) { |
| MEDIA_LOG(ERROR, media_log_) << "Invalid audio decoder config: " |
| << audio_config.AsHumanReadableString(); |
| return false; |
| } |
| has_audio_ = true; |
| audio_track_ids_.insert(audio_track_id); |
| const char* track_kind = (audio_track_ids_.size() == 1 ? "main" : ""); |
| media_tracks->AddAudioTrack(audio_config, audio_track_id, track_kind, |
| track->media.handler.name, |
| track->media.header.language()); |
| continue; |
| } |
| |
| if (track->media.handler.type == kVideo) { |
| detected_video_track_count++; |
| |
| 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(ERROR, media_log_) |
| << "Unsupported video format 0x" << std::hex << entry.format |
| << " in stsd box."; |
| return false; |
| } |
| |
| // TODO: Recover correct crop box |
| math::Size coded_size(entry.width, entry.height); |
| math::Rect visible_rect(coded_size); |
| |
| // If PASP is available, use the coded size and PASP to calculate the |
| // natural size. Otherwise, use the size in track header for natural size. |
| math::Size natural_size(visible_rect.size()); |
| if (entry.pixel_aspect.h_spacing != 1 || |
| entry.pixel_aspect.v_spacing != 1) { |
| natural_size = |
| GetNaturalSize(visible_rect.size(), entry.pixel_aspect.h_spacing, |
| entry.pixel_aspect.v_spacing); |
| } else if (track->header.width && track->header.height) { |
| natural_size = math::Size(track->header.width, track->header.height); |
| } |
| |
| uint32_t video_track_id = track->header.track_id; |
| if (video_track_ids_.find(video_track_id) != video_track_ids_.end()) { |
| MEDIA_LOG(ERROR, media_log_) |
| << "Video track with track_id=" << video_track_id |
| << " already present."; |
| return false; |
| } |
| bool is_track_encrypted = entry.sinf.info.track_encryption.is_encrypted; |
| is_track_encrypted_[video_track_id] = is_track_encrypted; |
| EncryptionScheme scheme = Unencrypted(); |
| if (is_track_encrypted) { |
| scheme = GetEncryptionScheme(entry.sinf); |
| if (!scheme.is_encrypted()) return false; |
| } |
| video_config.Initialize(entry.video_codec, entry.video_codec_profile, |
| PIXEL_FORMAT_YV12, COLOR_SPACE_HD_REC709, |
| coded_size, visible_rect, natural_size, |
| // No decoder-specific buffer needed for AVC; |
| // SPS/PPS are embedded in the video stream |
| EmptyExtraData(), scheme); |
| if (entry.color_parameter_information) { |
| WebMColorMetadata color_metadata = {}; |
| |
| color_metadata.color_space = |
| ConvertColorParameterInformationToColorSpace( |
| *entry.color_parameter_information); |
| |
| if (entry.mastering_display_color_volume) { |
| color_metadata.hdr_metadata.mastering_metadata = |
| ConvertMdcvToMasteringMetadata( |
| *entry.mastering_display_color_volume); |
| } |
| |
| if (entry.content_light_level_information) { |
| color_metadata.hdr_metadata.max_cll = |
| entry.content_light_level_information->max_content_light_level; |
| color_metadata.hdr_metadata.max_fall = |
| entry.content_light_level_information |
| ->max_pic_average_light_level; |
| } |
| |
| video_config.set_webm_color_metadata(color_metadata); |
| } |
| |
| DVLOG(1) << "video_track_id=" << video_track_id |
| << " config=" << video_config.AsHumanReadableString(); |
| if (!video_config.IsValidConfig()) { |
| MEDIA_LOG(ERROR, media_log_) << "Invalid video decoder config: " |
| << video_config.AsHumanReadableString(); |
| return false; |
| } |
| has_video_ = true; |
| video_track_ids_.insert(video_track_id); |
| const char* track_kind = (video_track_ids_.size() == 1 ? "main" : ""); |
| media_tracks->AddVideoTrack(video_config, video_track_id, track_kind, |
| track->media.handler.name, |
| track->media.header.language()); |
| continue; |
| } |
| |
| // TODO(wolenetz): Investigate support in MSE and Chrome MSE for CEA 608/708 |
| // embedded caption data in video track. At time of init segment parsing, we |
| // don't have this data (unless maybe by SourceBuffer's mimetype). |
| // See https://crbug.com/597073 |
| if (track->media.handler.type == kText) detected_text_track_count++; |
| } |
| |
| if (!moov_->pssh.empty()) OnEncryptedMediaInitData(moov_->pssh); |
| |
| RCHECK(config_cb_.Run(std::move(media_tracks), TextTrackConfigMap())); |
| |
| StreamParser::InitParameters params(kInfiniteDuration); |
| if (moov_->extends.header.fragment_duration > 0) { |
| params.duration = TimeDeltaFromRational( |
| moov_->extends.header.fragment_duration, moov_->header.timescale); |
| params.liveness = DemuxerStream::LIVENESS_RECORDED; |
| } else if (moov_->header.duration > 0 && |
| ((moov_->header.version == 0 && |
| moov_->header.duration != |
| std::numeric_limits<uint32_t>::max()) || |
| (moov_->header.version == 1 && |
| moov_->header.duration != |
| std::numeric_limits<uint64_t>::max()))) { |
| // In ISO/IEC 14496-12:2012, 8.2.2.3: "If the duration cannot be determined |
| // then duration is set to all 1s." |
| // The duration field is either 32-bit or 64-bit depending on the version in |
| // MovieHeaderBox. We interpret not 0 and not all 1's here as "known |
| // duration". |
| params.duration = |
| TimeDeltaFromRational(moov_->header.duration, moov_->header.timescale); |
| params.liveness = DemuxerStream::LIVENESS_RECORDED; |
| } else { |
| // In ISO/IEC 14496-12:2005(E), 8.30.2: ".. If an MP4 file is created in |
| // real-time, such as used in live streaming, it is not likely that the |
| // fragment_duration is known in advance and this (mehd) box may be |
| // omitted." |
| |
| // We have an unknown duration (neither any mvex fragment_duration nor moov |
| // duration value indicated a known duration, above.) |
| |
| // TODO(wolenetz): Investigate gating liveness detection on timeline_offset |
| // when it's populated. See http://crbug.com/312699 |
| params.liveness = DemuxerStream::LIVENESS_LIVE; |
| } |
| |
| DVLOG(1) << "liveness: " << params.liveness; |
| |
| if (!init_cb_.is_null()) { |
| params.detected_audio_track_count = detected_audio_track_count; |
| params.detected_video_track_count = detected_video_track_count; |
| params.detected_text_track_count = detected_text_track_count; |
| base::ResetAndReturn(&init_cb_).Run(params); |
| } |
| |
| 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(), media_log_)); |
| RCHECK(runs_->Init(moof)); |
| RCHECK(ComputeHighestEndOffset(moof)); |
| |
| if (!moof.pssh.empty()) OnEncryptedMediaInitData(moof.pssh); |
| |
| new_segment_cb_.Run(); |
| ChangeState(kWaitingForSampleData); |
| return true; |
| } |
| |
| void MP4StreamParser::OnEncryptedMediaInitData( |
| const std::vector<ProtectionSystemSpecificHeader>& headers) { |
| // TODO: 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. |
| size_t total_size = 0; |
| for (size_t i = 0; i < headers.size(); i++) |
| total_size += headers[i].raw_box.size(); |
| |
| std::vector<uint8_t> 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(); |
| } |
| encrypted_media_init_data_cb_.Run(kEmeInitDataTypeCenc, init_data); |
| } |
| |
| bool MP4StreamParser::PrepareAACBuffer( |
| const AAC& aac_config, std::vector<uint8_t>* 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()) { |
| subsamples->push_back(SubsampleEntry( |
| kADTSHeaderMinSize, frame_buf->size() - kADTSHeaderMinSize)); |
| } else { |
| (*subsamples)[0].clear_bytes += kADTSHeaderMinSize; |
| } |
| return true; |
| } |
| |
| bool MP4StreamParser::EnqueueSample(BufferQueueMap* 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 |new_segment_cb_| calls |
| *err = !SendAndFlushSamples(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_t* buf; |
| int buf_size; |
| queue_.Peek(&buf, &buf_size); |
| if (!buf_size) return false; |
| |
| bool audio = |
| audio_track_ids_.find(runs_->track_id()) != audio_track_ids_.end(); |
| bool video = |
| video_track_ids_.find(runs_->track_id()) != video_track_ids_.end(); |
| |
| // 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; |
| |
| if (runs_->sample_size() == 0) { |
| // Generally not expected, but spec allows it. Code below this block assumes |
| // the current sample is not empty. |
| LIMITED_MEDIA_LOG(DEBUG, media_log_, num_empty_samples_skipped_, |
| kMaxEmptySampleLogs) |
| << " Skipping 'trun' sample with size of 0."; |
| runs_->AdvanceSample(); |
| return true; |
| } |
| |
| std::unique_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_t> frame_buf(buf, buf + runs_->sample_size()); |
| if (video) { |
| if (runs_->video_description().video_codec == kCodecH264 || |
| runs_->video_description().video_codec == kCodecHEVC) { |
| DCHECK(runs_->video_description().frame_bitstream_converter); |
| if (!runs_->video_description().frame_bitstream_converter->ConvertFrame( |
| &frame_buf, runs_->is_keyframe(), &subsamples)) { |
| MEDIA_LOG(ERROR, media_log_) |
| << "Failed to prepare video 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(ERROR, media_log_) << "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->encryption_mode(), |
| decrypt_config->key_id(), decrypt_config->iv(), |
| subsamples, decrypt_config->encryption_pattern())); |
| } |
| // else, use the existing config. |
| } |
| |
| StreamParserBuffer::Type buffer_type = |
| audio ? DemuxerStream::AUDIO : DemuxerStream::VIDEO; |
| |
| scoped_refptr<StreamParserBuffer> stream_buf = StreamParserBuffer::CopyFrom( |
| buffer_allocator_, &frame_buf[0], frame_buf.size(), runs_->is_keyframe(), |
| buffer_type, runs_->track_id()); |
| |
| // This causes infinite spinner. |
| if (!stream_buf) { |
| return false; |
| } |
| |
| if (decrypt_config) stream_buf->set_decrypt_config(std::move(decrypt_config)); |
| |
| stream_buf->set_duration(runs_->duration()); |
| stream_buf->set_timestamp(runs_->cts()); |
| stream_buf->SetDecodeTimestamp(runs_->dts()); |
| |
| DVLOG(3) << "Emit " << (audio ? "audio" : "video") << " frame: " |
| << " track_id=" << runs_->track_id() |
| << ", key=" << runs_->is_keyframe() |
| << ", dur=" << runs_->duration().InMilliseconds() |
| << ", dts=" << runs_->dts().InMilliseconds() |
| << ", cts=" << runs_->cts().InMilliseconds() |
| << ", size=" << runs_->sample_size(); |
| |
| (*buffers)[runs_->track_id()].push_back(stream_buf); |
| runs_->AdvanceSample(); |
| return true; |
| } |
| |
| bool MP4StreamParser::SendAndFlushSamples(BufferQueueMap* buffers) { |
| if (buffers->empty()) return true; |
| bool success = new_buffers_cb_.Run(*buffers); |
| buffers->clear(); |
| return success; |
| } |
| |
| bool MP4StreamParser::ReadAndDiscardMDATsUntil(int64_t max_clear_offset) { |
| bool err = false; |
| int64_t upper_bound = std::min(max_clear_offset, queue_.tail()); |
| while (mdat_tail_ < upper_bound) { |
| const uint8_t* buf = NULL; |
| int size = 0; |
| queue_.PeekAt(mdat_tail_, &buf, &size); |
| |
| FourCC type; |
| int box_sz; |
| if (!BoxReader::StartTopLevelBox(buf, size, media_log_, &type, &box_sz, |
| &err)) |
| break; |
| |
| if (type != FOURCC_MDAT) { |
| MEDIA_LOG(DEBUG, media_log_) |
| << "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(), media_log_); |
| RCHECK(runs.Init(moof)); |
| |
| while (runs.IsRunValid()) { |
| int64_t 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_t 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 |
| } // namespace cobalt |
