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shaka-packager/packager/media/formats/mp4/mp4_media_parser.cc

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// Copyright (c) 2012 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 "packager/media/formats/mp4/mp4_media_parser.h"
#include <algorithm>
#include "packager/base/callback.h"
#include "packager/base/callback_helpers.h"
#include "packager/base/logging.h"
#include "packager/base/strings/string_number_conversions.h"
#include "packager/file/file.h"
#include "packager/file/file_closer.h"
#include "packager/media/base/audio_stream_info.h"
#include "packager/media/base/buffer_reader.h"
#include "packager/media/base/decrypt_config.h"
#include "packager/media/base/key_source.h"
#include "packager/media/base/macros.h"
#include "packager/media/base/media_sample.h"
#include "packager/media/base/rcheck.h"
#include "packager/media/base/video_stream_info.h"
#include "packager/media/base/video_util.h"
#include "packager/media/codecs/ac3_audio_util.h"
#include "packager/media/codecs/av1_codec_configuration_record.h"
#include "packager/media/codecs/avc_decoder_configuration_record.h"
#include "packager/media/codecs/dovi_decoder_configuration_record.h"
#include "packager/media/codecs/ec3_audio_util.h"
#include "packager/media/codecs/ac4_audio_util.h"
#include "packager/media/codecs/es_descriptor.h"
#include "packager/media/codecs/hevc_decoder_configuration_record.h"
#include "packager/media/codecs/vp_codec_configuration_record.h"
#include "packager/media/formats/mp4/box_definitions.h"
#include "packager/media/formats/mp4/box_reader.h"
#include "packager/media/formats/mp4/track_run_iterator.h"
namespace shaka {
namespace media {
namespace mp4 {
namespace {
uint64_t Rescale(uint64_t time_in_old_scale,
uint32_t old_scale,
uint32_t new_scale) {
return (static_cast<double>(time_in_old_scale) / old_scale) * new_scale;
}
H26xStreamFormat GetH26xStreamFormat(FourCC fourcc) {
switch (fourcc) {
case FOURCC_avc1:
case FOURCC_dvh1:
case FOURCC_hvc1:
return H26xStreamFormat::kNalUnitStreamWithoutParameterSetNalus;
case FOURCC_avc3:
case FOURCC_dvhe:
case FOURCC_hev1:
return H26xStreamFormat::kNalUnitStreamWithParameterSetNalus;
default:
return H26xStreamFormat::kUnSpecified;
}
}
Codec FourCCToCodec(FourCC fourcc) {
switch (fourcc) {
case FOURCC_av01:
return kCodecAV1;
case FOURCC_avc1:
case FOURCC_avc3:
return kCodecH264;
case FOURCC_dvh1:
case FOURCC_dvhe:
return kCodecH265DolbyVision;
case FOURCC_hev1:
case FOURCC_hvc1:
return kCodecH265;
case FOURCC_vp08:
return kCodecVP8;
case FOURCC_vp09:
return kCodecVP9;
case FOURCC_Opus:
return kCodecOpus;
case FOURCC_dtsc:
return kCodecDTSC;
case FOURCC_dtsh:
return kCodecDTSH;
case FOURCC_dtsl:
return kCodecDTSL;
case FOURCC_dtse:
return kCodecDTSE;
case FOURCC_dtsp:
return kCodecDTSP;
case FOURCC_dtsm:
return kCodecDTSM;
case FOURCC_ac_3:
return kCodecAC3;
case FOURCC_ec_3:
return kCodecEAC3;
case FOURCC_ac_4:
return kCodecAC4;
case FOURCC_fLaC:
return kCodecFlac;
default:
return kUnknownCodec;
}
}
Codec ObjectTypeToCodec(ObjectType object_type) {
switch (object_type) {
case ObjectType::kISO_14496_3:
case ObjectType::kISO_13818_7_AAC_LC:
return kCodecAAC;
case ObjectType::kDTSC:
return kCodecDTSC;
case ObjectType::kDTSE:
return kCodecDTSE;
case ObjectType::kDTSH:
return kCodecDTSH;
case ObjectType::kDTSL:
return kCodecDTSL;
default:
return kUnknownCodec;
}
}
std::vector<uint8_t> GetDOVIDecoderConfig(
const std::vector<CodecConfiguration>& configs) {
for (const CodecConfiguration& config : configs) {
if (config.box_type == FOURCC_dvcC || config.box_type == FOURCC_dvvC) {
return config.data;
}
}
return std::vector<uint8_t>();
}
bool UpdateCodecStringForDolbyVision(
FourCC actual_format,
const std::vector<CodecConfiguration>& configs,
std::string* codec_string) {
DOVIDecoderConfigurationRecord dovi_config;
if (!dovi_config.Parse(GetDOVIDecoderConfig(configs))) {
LOG(ERROR) << "Failed to parse Dolby Vision decoder "
"configuration record.";
return false;
}
switch (actual_format) {
case FOURCC_dvh1:
case FOURCC_dvhe:
// Non-Backward compatibility mode. Replace the code string with
// Dolby Vision only.
*codec_string = dovi_config.GetCodecString(actual_format);
break;
case FOURCC_hev1:
// Backward compatibility mode. Two codecs are signalled: base codec
// without Dolby Vision and HDR with Dolby Vision.
*codec_string += ";" + dovi_config.GetCodecString(FOURCC_dvhe);
break;
case FOURCC_hvc1:
// See above.
*codec_string += ";" + dovi_config.GetCodecString(FOURCC_dvh1);
break;
default:
LOG(ERROR) << "Unsupported format with extra codec "
<< FourCCToString(actual_format);
return false;
}
return true;
}
const uint64_t kNanosecondsPerSecond = 1000000000ull;
} // namespace
MP4MediaParser::MP4MediaParser()
: state_(kWaitingForInit),
decryption_key_source_(NULL),
moof_head_(0),
mdat_tail_(0) {}
MP4MediaParser::~MP4MediaParser() {}
void MP4MediaParser::Init(const InitCB& init_cb,
const NewSampleCB& new_sample_cb,
KeySource* decryption_key_source) {
DCHECK_EQ(state_, kWaitingForInit);
DCHECK(init_cb_.is_null());
DCHECK(!init_cb.is_null());
DCHECK(!new_sample_cb.is_null());
ChangeState(kParsingBoxes);
init_cb_ = init_cb;
new_sample_cb_ = new_sample_cb;
decryption_key_source_ = decryption_key_source;
if (decryption_key_source)
decryptor_source_.reset(new DecryptorSource(decryption_key_source));
}
void MP4MediaParser::Reset() {
queue_.Reset();
runs_.reset();
moof_head_ = 0;
mdat_tail_ = 0;
}
bool MP4MediaParser::Flush() {
DCHECK_NE(state_, kWaitingForInit);
Reset();
ChangeState(kParsingBoxes);
return true;
}
bool MP4MediaParser::Parse(const uint8_t* buf, int size) {
DCHECK_NE(state_, kWaitingForInit);
if (state_ == kError)
return false;
queue_.Push(buf, size);
bool result, err = false;
do {
if (state_ == kParsingBoxes) {
result = ParseBox(&err);
} else {
DCHECK_EQ(kEmittingSamples, state_);
result = EnqueueSample(&err);
if (result) {
int64_t max_clear = runs_->GetMaxClearOffset() + moof_head_;
err = !ReadAndDiscardMDATsUntil(max_clear);
}
}
} while (result && !err);
if (err) {
DLOG(ERROR) << "Error while parsing MP4";
moov_.reset();
Reset();
ChangeState(kError);
return false;
}
return true;
}
bool MP4MediaParser::LoadMoov(const std::string& file_path) {
std::unique_ptr<File, FileCloser> file(
File::OpenWithNoBuffering(file_path.c_str(), "r"));
if (!file) {
LOG(ERROR) << "Unable to open media file '" << file_path << "'";
return false;
}
if (!file->Seek(0)) {
LOG(WARNING) << "Filesystem does not support seeking on file '" << file_path
<< "'";
return false;
}
uint64_t file_position(0);
bool mdat_seen(false);
while (true) {
const uint32_t kBoxHeaderReadSize(16);
std::vector<uint8_t> buffer(kBoxHeaderReadSize);
int64_t bytes_read = file->Read(&buffer[0], kBoxHeaderReadSize);
if (bytes_read == 0) {
LOG(ERROR) << "Could not find 'moov' box in file '" << file_path << "'";
return false;
}
if (bytes_read < kBoxHeaderReadSize) {
LOG(ERROR) << "Error reading media file '" << file_path << "'";
return false;
}
uint64_t box_size;
FourCC box_type;
bool err;
if (!BoxReader::StartBox(&buffer[0], kBoxHeaderReadSize, &box_type,
&box_size, &err)) {
LOG(ERROR) << "Could not start box from file '" << file_path << "'";
return false;
}
if (box_type == FOURCC_mdat) {
mdat_seen = true;
} else if (box_type == FOURCC_moov) {
if (!mdat_seen) {
// 'moov' is before 'mdat'. Nothing to do.
break;
}
// 'mdat' before 'moov'. Read and parse 'moov'.
if (!Parse(&buffer[0], bytes_read)) {
LOG(ERROR) << "Error parsing mp4 file '" << file_path << "'";
return false;
}
uint64_t bytes_to_read = box_size - bytes_read;
buffer.resize(bytes_to_read);
while (bytes_to_read > 0) {
bytes_read = file->Read(&buffer[0], bytes_to_read);
if (bytes_read <= 0) {
LOG(ERROR) << "Error reading 'moov' contents from file '" << file_path
<< "'";
return false;
}
if (!Parse(&buffer[0], bytes_read)) {
LOG(ERROR) << "Error parsing mp4 file '" << file_path << "'";
return false;
}
bytes_to_read -= bytes_read;
}
queue_.Reset(); // So that we don't need to adjust data offsets.
mdat_tail_ = 0; // So it will skip boxes until mdat.
break; // Done.
}
file_position += box_size;
if (!file->Seek(file_position)) {
LOG(ERROR) << "Error skipping box in mp4 file '" << file_path << "'";
return false;
}
}
return true;
}
bool MP4MediaParser::ParseBox(bool* err) {
const uint8_t* buf;
int size;
queue_.Peek(&buf, &size);
if (!size)
return false;
std::unique_ptr<BoxReader> reader(BoxReader::ReadBox(buf, size, err));
if (reader.get() == NULL)
return false;
if (reader->type() == FOURCC_mdat) {
if (!moov_) {
// For seekable files, we seek to the 'moov' and load the 'moov' first
// then seek back (see LoadMoov function for details); we do not support
// having 'mdat' before 'moov' for non-seekable files. The code ends up
// here only if it is a non-seekable file.
NOTIMPLEMENTED() << " Non-seekable Files with 'mdat' box before 'moov' "
"box is not supported.";
*err = true;
return false;
} else {
// This can happen if there are unused 'mdat' boxes, which is unusual
// but allowed by the spec. Ignore the 'mdat' and proceed.
LOG(INFO)
<< "Ignore unused 'mdat' box - this could be as a result of extra "
"not usable 'mdat' or 'mdat' associated with unrecognized track.";
}
}
// Set up mdat offset for ReadMDATsUntil().
mdat_tail_ = queue_.head() + reader->size();
if (reader->type() == FOURCC_moov) {
*err = !ParseMoov(reader.get());
} else if (reader->type() == FOURCC_moof) {
moof_head_ = queue_.head();
*err = !ParseMoof(reader.get());
// 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 {
VLOG(2) << "Skipping top-level box: " << FourCCToString(reader->type());
}
queue_.Pop(static_cast<int>(reader->size()));
return !(*err);
}
bool MP4MediaParser::ParseMoov(BoxReader* reader) {
if (moov_)
return true; // Already parsed the 'moov' box.
moov_.reset(new Movie);
RCHECK(moov_->Parse(reader));
runs_.reset();
std::vector<std::shared_ptr<StreamInfo>> streams;
for (std::vector<Track>::const_iterator track = moov_->tracks.begin();
track != moov_->tracks.end(); ++track) {
const uint32_t timescale = track->media.header.timescale;
// Calculate duration (based on timescale).
uint64_t duration = 0;
if (track->media.header.duration > 0) {
duration = track->media.header.duration;
} else if (moov_->extends.header.fragment_duration > 0) {
DCHECK(moov_->header.timescale != 0);
duration = Rescale(moov_->extends.header.fragment_duration,
moov_->header.timescale,
timescale);
} else if (moov_->header.duration > 0 &&
moov_->header.duration != std::numeric_limits<uint64_t>::max()) {
DCHECK(moov_->header.timescale != 0);
duration =
Rescale(moov_->header.duration, moov_->header.timescale, timescale);
}
const SampleDescription& samp_descr =
track->media.information.sample_table.description;
size_t desc_idx = 0;
// Read sample description index from mvex if it exists otherwise read
// from the first entry in Sample To Chunk box.
if (moov_->extends.tracks.size() > 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;
}
}
} else {
const std::vector<ChunkInfo>& chunk_info =
track->media.information.sample_table.sample_to_chunk.chunk_info;
RCHECK(chunk_info.size() > 0);
desc_idx = chunk_info[0].sample_description_index;
}
RCHECK(desc_idx > 0);
desc_idx -= 1; // BMFF descriptor index is one-based
if (samp_descr.type == kAudio) {
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 FourCC actual_format = entry.GetActualFormat();
Codec codec = FourCCToCodec(actual_format);
uint8_t num_channels = entry.channelcount;
uint32_t sampling_frequency = entry.samplerate;
uint64_t codec_delay_ns = 0;
uint8_t audio_object_type = 0;
uint32_t max_bitrate = 0;
uint32_t avg_bitrate = 0;
std::vector<uint8_t> codec_config;
switch (actual_format) {
case FOURCC_mp4a: {
const DecoderConfigDescriptor& decoder_config =
entry.esds.es_descriptor.decoder_config_descriptor();
max_bitrate = decoder_config.max_bitrate();
avg_bitrate = decoder_config.avg_bitrate();
codec = ObjectTypeToCodec(decoder_config.object_type());
if (codec == kCodecAAC) {
const AACAudioSpecificConfig& aac_audio_specific_config =
entry.esds.aac_audio_specific_config;
num_channels = aac_audio_specific_config.GetNumChannels();
sampling_frequency =
aac_audio_specific_config.GetSamplesPerSecond();
audio_object_type = aac_audio_specific_config.GetAudioObjectType();
codec_config =
decoder_config.decoder_specific_info_descriptor().data();
} else if (codec == kUnknownCodec) {
// Intentionally not to fail in the parser as there may be multiple
// streams in the source content, which allows the supported stream
// to be packaged. An error will be returned if the unsupported
// stream is passed to the muxer.
LOG(WARNING) << "Unsupported audio object type "
<< static_cast<int>(decoder_config.object_type())
<< " in stsd.es_desriptor.";
}
break;
}
case FOURCC_dtsc:
FALLTHROUGH_INTENDED;
case FOURCC_dtse:
FALLTHROUGH_INTENDED;
case FOURCC_dtsh:
FALLTHROUGH_INTENDED;
case FOURCC_dtsl:
FALLTHROUGH_INTENDED;
case FOURCC_dtsm:
codec_config = entry.ddts.extra_data;
max_bitrate = entry.ddts.max_bitrate;
avg_bitrate = entry.ddts.avg_bitrate;
break;
case FOURCC_ac_3:
codec_config = entry.dac3.data;
num_channels = static_cast<uint8_t>(GetAc3NumChannels(codec_config));
break;
case FOURCC_ec_3:
codec_config = entry.dec3.data;
num_channels = static_cast<uint8_t>(GetEc3NumChannels(codec_config));
break;
case FOURCC_ac_4:
codec_config = entry.dac4.data;
// Stop the process if have errors when parsing AC-4 dac4 box,
// bitstream version 0 (has beed deprecated) and contains multiple
// presentations in single AC-4 stream (only used for broadcast).
if (!GetAc4CodecInfo(codec_config, &audio_object_type)) {
LOG(ERROR) << "Failed to parse dac4.";
return false;
}
break;
case FOURCC_fLaC:
codec_config = entry.dfla.data;
break;
case FOURCC_Opus:
codec_config = entry.dops.opus_identification_header;
codec_delay_ns =
entry.dops.preskip * kNanosecondsPerSecond / sampling_frequency;
break;
default:
// Intentionally not to fail in the parser as there may be multiple
// streams in the source content, which allows the supported stream to
// be packaged.
// An error will be returned if the unsupported stream is passed to
// the muxer.
LOG(WARNING) << "Unsupported audio format '"
<< FourCCToString(actual_format) << "' in stsd box.";
break;
}
// Extract possible seek preroll.
uint64_t seek_preroll_ns = 0;
for (const auto& sample_group_description :
track->media.information.sample_table.sample_group_descriptions) {
if (sample_group_description.grouping_type != FOURCC_roll)
continue;
const auto& audio_roll_recovery_entries =
sample_group_description.audio_roll_recovery_entries;
if (audio_roll_recovery_entries.size() != 1) {
LOG(WARNING) << "Unexpected number of entries in "
"SampleGroupDescription table with grouping type "
"'roll'.";
break;
}
const int16_t roll_distance_in_samples =
audio_roll_recovery_entries[0].roll_distance;
if (roll_distance_in_samples < 0) {
RCHECK(sampling_frequency != 0);
seek_preroll_ns = kNanosecondsPerSecond *
(-roll_distance_in_samples) / sampling_frequency;
} else {
LOG(WARNING)
<< "Roll distance is supposed to be negative, but seeing "
<< roll_distance_in_samples;
}
break;
}
// The stream will be decrypted if a |decryptor_source_| is available.
const bool is_encrypted =
decryptor_source_
? false
: entry.sinf.info.track_encryption.default_is_protected == 1;
DVLOG(1) << "is_audio_track_encrypted_: " << is_encrypted;
streams.emplace_back(new AudioStreamInfo(
track->header.track_id, timescale, duration, codec,
AudioStreamInfo::GetCodecString(codec, audio_object_type),
codec_config.data(), codec_config.size(), entry.samplesize,
num_channels, sampling_frequency, seek_preroll_ns, codec_delay_ns,
max_bitrate, avg_bitrate, track->media.header.language.code,
is_encrypted));
}
if (samp_descr.type == kVideo) {
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];
std::vector<uint8_t> codec_configuration_data =
entry.codec_configuration.data;
uint32_t coded_width = entry.width;
uint32_t coded_height = entry.height;
uint32_t pixel_width = entry.pixel_aspect.h_spacing;
uint32_t pixel_height = entry.pixel_aspect.v_spacing;
if (pixel_width == 0 && pixel_height == 0) {
DerivePixelWidthHeight(coded_width, coded_height, track->header.width,
track->header.height, &pixel_width,
&pixel_height);
}
std::string codec_string;
uint8_t nalu_length_size = 0;
uint8_t transfer_characteristics = 0;
const FourCC actual_format = entry.GetActualFormat();
const Codec video_codec = FourCCToCodec(actual_format);
switch (actual_format) {
case FOURCC_av01: {
AV1CodecConfigurationRecord av1_config;
if (!av1_config.Parse(codec_configuration_data)) {
LOG(ERROR) << "Failed to parse av1c.";
return false;
}
codec_string = av1_config.GetCodecString();
break;
}
case FOURCC_avc1:
case FOURCC_avc3: {
AVCDecoderConfigurationRecord avc_config;
if (!avc_config.Parse(codec_configuration_data)) {
LOG(ERROR) << "Failed to parse avcc.";
return false;
}
codec_string = avc_config.GetCodecString(actual_format);
nalu_length_size = avc_config.nalu_length_size();
transfer_characteristics = avc_config.transfer_characteristics();
// Use configurations from |avc_config| if it is valid.
if (avc_config.coded_width() != 0) {
DCHECK_NE(avc_config.coded_height(), 0u);
if (coded_width != avc_config.coded_width() ||
coded_height != avc_config.coded_height()) {
LOG(WARNING) << "Resolution in VisualSampleEntry (" << coded_width
<< "," << coded_height
<< ") does not match with resolution in "
"AVCDecoderConfigurationRecord ("
<< avc_config.coded_width() << ","
<< avc_config.coded_height()
<< "). Use AVCDecoderConfigurationRecord.";
coded_width = avc_config.coded_width();
coded_height = avc_config.coded_height();
}
DCHECK_NE(avc_config.pixel_width(), 0u);
DCHECK_NE(avc_config.pixel_height(), 0u);
if (pixel_width != avc_config.pixel_width() ||
pixel_height != avc_config.pixel_height()) {
LOG_IF(WARNING, pixel_width != 1 || pixel_height != 1)
<< "Pixel aspect ratio in PASP box (" << pixel_width << ","
<< pixel_height
<< ") does not match with SAR in "
"AVCDecoderConfigurationRecord "
"("
<< avc_config.pixel_width() << ","
<< avc_config.pixel_height()
<< "). Use AVCDecoderConfigurationRecord.";
pixel_width = avc_config.pixel_width();
pixel_height = avc_config.pixel_height();
}
}
break;
}
case FOURCC_dvh1:
case FOURCC_dvhe:
case FOURCC_hev1:
case FOURCC_hvc1: {
HEVCDecoderConfigurationRecord hevc_config;
if (!hevc_config.Parse(codec_configuration_data)) {
LOG(ERROR) << "Failed to parse hevc.";
return false;
}
codec_string = hevc_config.GetCodecString(actual_format);
nalu_length_size = hevc_config.nalu_length_size();
transfer_characteristics = hevc_config.transfer_characteristics();
if (!entry.extra_codec_configs.empty()) {
// |extra_codec_configs| is present only for Dolby Vision.
if (!UpdateCodecStringForDolbyVision(
actual_format, entry.extra_codec_configs, &codec_string)) {
return false;
}
}
break;
}
case FOURCC_vp08:
case FOURCC_vp09: {
VPCodecConfigurationRecord vp_config;
if (!vp_config.ParseMP4(codec_configuration_data)) {
LOG(ERROR) << "Failed to parse vpcc.";
return false;
}
if (actual_format == FOURCC_vp09 &&
(!vp_config.is_level_set() || vp_config.level() == 0)) {
const double kUnknownSampleDuration = 0.0;
vp_config.SetVP9Level(coded_width, coded_height,
kUnknownSampleDuration);
vp_config.WriteMP4(&codec_configuration_data);
}
codec_string = vp_config.GetCodecString(video_codec);
break;
}
default:
// Intentionally not to fail in the parser as there may be multiple
// streams in the source content, which allows the supported stream to
// be packaged.
// An error will be returned if the unsupported stream is passed to
// the muxer.
LOG(WARNING) << "Unsupported video format '"
<< FourCCToString(actual_format) << "' in stsd box.";
break;
}
// The stream will be decrypted if a |decryptor_source_| is available.
const bool is_encrypted =
decryptor_source_
? false
: entry.sinf.info.track_encryption.default_is_protected == 1;
DVLOG(1) << "is_video_track_encrypted_: " << is_encrypted;
std::shared_ptr<VideoStreamInfo> video_stream_info(new VideoStreamInfo(
track->header.track_id, timescale, duration, video_codec,
GetH26xStreamFormat(actual_format), codec_string,
codec_configuration_data.data(), codec_configuration_data.size(),
coded_width, coded_height, pixel_width, pixel_height,
transfer_characteristics,
0, // trick_play_factor
nalu_length_size, track->media.header.language.code, is_encrypted));
video_stream_info->set_extra_config(entry.ExtraCodecConfigsAsVector());
// Set pssh raw data if it has.
if (moov_->pssh.size() > 0) {
std::vector<uint8_t> pssh_raw_data;
for (const auto& pssh : moov_->pssh) {
pssh_raw_data.insert(pssh_raw_data.end(), pssh.raw_box.begin(),
pssh.raw_box.end());
}
video_stream_info->set_eme_init_data(pssh_raw_data.data(),
pssh_raw_data.size());
}
streams.push_back(video_stream_info);
}
}
init_cb_.Run(streams);
if (!FetchKeysIfNecessary(moov_->pssh))
return false;
runs_.reset(new TrackRunIterator(moov_.get()));
RCHECK(runs_->Init());
ChangeState(kEmittingSamples);
return true;
}
bool MP4MediaParser::ParseMoof(BoxReader* reader) {
// Must already have initialization segment.
RCHECK(moov_.get());
MovieFragment moof;
RCHECK(moof.Parse(reader));
if (!runs_)
runs_.reset(new TrackRunIterator(moov_.get()));
RCHECK(runs_->Init(moof));
if (!FetchKeysIfNecessary(moof.pssh))
return false;
ChangeState(kEmittingSamples);
return true;
}
bool MP4MediaParser::FetchKeysIfNecessary(
const std::vector<ProtectionSystemSpecificHeader>& headers) {
if (headers.empty())
return true;
// An error will be returned later if the samples need to be decrypted.
if (!decryption_key_source_)
return true;
std::vector<uint8_t> pssh_raw_data;
for (const auto& header : headers) {
pssh_raw_data.insert(pssh_raw_data.end(), header.raw_box.begin(),
header.raw_box.end());
}
Status status =
decryption_key_source_->FetchKeys(EmeInitDataType::CENC, pssh_raw_data);
if (!status.ok()) {
LOG(ERROR) << "Error fetching decryption keys: " << status;
return false;
}
return true;
}
bool MP4MediaParser::EnqueueSample(bool* err) {
if (!runs_->IsRunValid()) {
// Remain in kEnqueueingSamples 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);
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;
// Skip this entire track if it is not audio nor video.
if (!runs_->is_audio() && !runs_->is_video())
runs_->AdvanceRun();
// 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;
}
int64_t sample_offset = runs_->sample_offset() + moof_head_;
queue_.PeekAt(sample_offset, &buf, &buf_size);
if (buf_size < runs_->sample_size()) {
if (sample_offset < queue_.head()) {
LOG(ERROR) << "Incorrect sample offset " << sample_offset
<< " < " << queue_.head();
*err = true;
}
return false;
}
const uint8_t* media_data = buf;
const size_t media_data_size = runs_->sample_size();
// Use a dummy data size of 0 to avoid copying overhead.
// Actual media data is set later.
const size_t kDummyDataSize = 0;
std::shared_ptr<MediaSample> stream_sample(
MediaSample::CopyFrom(media_data, kDummyDataSize, runs_->is_keyframe()));
if (runs_->is_encrypted()) {
std::shared_ptr<uint8_t> decrypted_media_data(
new uint8_t[media_data_size], std::default_delete<uint8_t[]>());
std::unique_ptr<DecryptConfig> decrypt_config = runs_->GetDecryptConfig();
if (!decrypt_config) {
*err = true;
LOG(ERROR) << "Missing decrypt config.";
return false;
}
if (!decryptor_source_) {
stream_sample->SetData(media_data, media_data_size);
// If the demuxer does not have the decryptor_source_, store
// decrypt_config so that the demuxed sample can be decrypted later.
stream_sample->set_decrypt_config(std::move(decrypt_config));
stream_sample->set_is_encrypted(true);
} else {
if (!decryptor_source_->DecryptSampleBuffer(decrypt_config.get(),
media_data, media_data_size,
decrypted_media_data.get())) {
*err = true;
LOG(ERROR) << "Cannot decrypt samples.";
return false;
}
stream_sample->TransferData(std::move(decrypted_media_data),
media_data_size);
}
} else {
stream_sample->SetData(media_data, media_data_size);
}
stream_sample->set_dts(runs_->dts());
stream_sample->set_pts(runs_->cts());
stream_sample->set_duration(runs_->duration());
DVLOG(3) << "Pushing frame: "
<< ", key=" << runs_->is_keyframe()
<< ", dur=" << runs_->duration()
<< ", dts=" << runs_->dts()
<< ", cts=" << runs_->cts()
<< ", size=" << runs_->sample_size();
if (!new_sample_cb_.Run(runs_->track_id(), stream_sample)) {
*err = true;
LOG(ERROR) << "Failed to process the sample.";
return false;
}
runs_->AdvanceSample();
return true;
}
bool MP4MediaParser::ReadAndDiscardMDATsUntil(const int64_t offset) {
bool err = false;
while (mdat_tail_ < offset) {
const uint8_t* buf;
int size;
queue_.PeekAt(mdat_tail_, &buf, &size);
FourCC type;
uint64_t box_sz;
if (!BoxReader::StartBox(buf, size, &type, &box_sz, &err))
break;
mdat_tail_ += box_sz;
}
queue_.Trim(std::min(mdat_tail_, offset));
return !err;
}
void MP4MediaParser::ChangeState(State new_state) {
DVLOG(2) << "Changing state: " << new_state;
state_ = new_state;
}
} // namespace mp4
} // namespace media
} // namespace shaka
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