417 lines
15 KiB
C++
417 lines
15 KiB
C++
// Copyright 2015 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#include "packager/media/formats/webm/segmenter.h"
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#include "packager/base/time/time.h"
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#include "packager/media/base/audio_stream_info.h"
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#include "packager/media/base/media_handler.h"
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#include "packager/media/base/media_sample.h"
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#include "packager/media/base/muxer_options.h"
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#include "packager/media/base/muxer_util.h"
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#include "packager/media/base/stream_info.h"
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#include "packager/media/base/video_stream_info.h"
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#include "packager/media/codecs/vp_codec_configuration_record.h"
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#include "packager/media/event/muxer_listener.h"
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#include "packager/media/event/progress_listener.h"
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#include "packager/third_party/libwebm/src/mkvmuxerutil.hpp"
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#include "packager/third_party/libwebm/src/webmids.hpp"
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#include "packager/version/version.h"
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namespace shaka {
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namespace media {
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namespace webm {
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namespace {
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int64_t kTimecodeScale = 1000000;
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int64_t kSecondsToNs = 1000000000L;
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} // namespace
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Segmenter::Segmenter(const MuxerOptions& options) : options_(options) {}
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Segmenter::~Segmenter() {}
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Status Segmenter::Initialize(StreamInfo* info,
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ProgressListener* progress_listener,
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MuxerListener* muxer_listener,
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KeySource* encryption_key_source,
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uint32_t max_sd_pixels,
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uint32_t max_hd_pixels,
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uint32_t max_uhd1_pixels,
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double clear_lead_in_seconds) {
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muxer_listener_ = muxer_listener;
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info_ = info;
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clear_lead_ = clear_lead_in_seconds;
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// Use media duration as progress target.
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progress_target_ = info_->duration();
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progress_listener_ = progress_listener;
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segment_info_.Init();
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segment_info_.set_timecode_scale(kTimecodeScale);
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const std::string version = GetPackagerVersion();
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if (!version.empty()) {
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segment_info_.set_writing_app(
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(GetPackagerProjectUrl() + " version " + version).c_str());
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}
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if (options().segment_template.empty()) {
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// Set an initial duration so the duration element is written; will be
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// overwritten at the end. This works because this is a float and floats
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// are always the same size.
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segment_info_.set_duration(1);
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}
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Status status;
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if (encryption_key_source) {
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status = InitializeEncryptor(encryption_key_source,
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max_sd_pixels,
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max_hd_pixels,
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max_uhd1_pixels);
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if (!status.ok())
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return status;
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}
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// Create the track info.
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switch (info_->stream_type()) {
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case kStreamVideo:
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status = CreateVideoTrack(static_cast<VideoStreamInfo*>(info_));
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break;
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case kStreamAudio:
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status = CreateAudioTrack(static_cast<AudioStreamInfo*>(info_));
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break;
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default:
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NOTIMPLEMENTED() << "Not implemented for stream type: "
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<< info_->stream_type();
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status = Status(error::UNIMPLEMENTED, "Not implemented for stream type");
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}
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if (!status.ok())
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return status;
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return DoInitialize();
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}
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Status Segmenter::Finalize() {
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uint64_t duration =
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prev_sample_->pts() - first_timestamp_ + prev_sample_->duration();
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segment_info_.set_duration(FromBMFFTimescale(duration));
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return DoFinalize();
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}
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Status Segmenter::AddSample(std::shared_ptr<MediaSample> sample) {
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if (sample_duration_ == 0) {
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first_timestamp_ = sample->pts();
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sample_duration_ = sample->duration();
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if (muxer_listener_)
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muxer_listener_->OnSampleDurationReady(sample_duration_);
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}
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UpdateProgress(sample->duration());
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// This writes frames in a delay. Meaning that the previous frame is written
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// on this call to AddSample. The current frame is stored until the next
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// call. This is done to determine which frame is the last in a Cluster.
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// This first block determines if this is a new Cluster and writes the
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// previous frame first before creating the new Cluster.
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Status status;
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if (new_segment_ || new_subsegment_) {
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status = NewSegment(sample->pts(), new_subsegment_);
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} else {
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status = WriteFrame(false /* write_duration */);
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}
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if (!status.ok())
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return status;
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// Encrypt the frame.
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if (encryptor_) {
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// Don't enable encryption in the middle of a segment, i.e. only at the
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// first frame of a segment.
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if (new_segment_ && !enable_encryption_) {
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if (sample->pts() - first_timestamp_ >=
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clear_lead_ * info_->time_scale()) {
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enable_encryption_ = true;
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if (muxer_listener_)
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muxer_listener_->OnEncryptionStart();
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}
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}
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status = encryptor_->EncryptFrame(sample, enable_encryption_);
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if (!status.ok()) {
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LOG(ERROR) << "Error encrypting frame.";
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return status;
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}
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}
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new_subsegment_ = false;
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new_segment_ = false;
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prev_sample_ = sample;
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return Status::OK;
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}
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Status Segmenter::FinalizeSegment(uint64_t start_timescale,
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uint64_t duration_timescale,
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bool is_subsegment) {
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if (is_subsegment)
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new_subsegment_ = true;
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else
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new_segment_ = true;
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return WriteFrame(true /* write duration */);
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}
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float Segmenter::GetDuration() const {
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return static_cast<float>(segment_info_.duration()) *
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segment_info_.timecode_scale() / kSecondsToNs;
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}
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uint64_t Segmenter::FromBMFFTimescale(uint64_t time_timescale) {
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// Convert the time from BMFF time_code to WebM timecode scale.
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const int64_t time_ns =
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kSecondsToNs * time_timescale / info_->time_scale();
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return time_ns / segment_info_.timecode_scale();
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}
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uint64_t Segmenter::FromWebMTimecode(uint64_t time_webm_timecode) {
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// Convert the time to BMFF time_code from WebM timecode scale.
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const int64_t time_ns = time_webm_timecode * segment_info_.timecode_scale();
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return time_ns * info_->time_scale() / kSecondsToNs;
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}
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Status Segmenter::WriteSegmentHeader(uint64_t file_size, MkvWriter* writer) {
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Status error_status(error::FILE_FAILURE, "Error writing segment header.");
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if (!WriteEbmlHeader(writer))
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return error_status;
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if (WriteID(writer, mkvmuxer::kMkvSegment) != 0)
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return error_status;
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const uint64_t segment_size_size = 8;
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segment_payload_pos_ = writer->Position() + segment_size_size;
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if (file_size > 0) {
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// We want the size of the segment element, so subtract the header.
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if (WriteUIntSize(writer, file_size - segment_payload_pos_,
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segment_size_size) != 0)
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return error_status;
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if (!seek_head_.Write(writer))
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return error_status;
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} else {
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if (SerializeInt(writer, mkvmuxer::kEbmlUnknownValue, segment_size_size) !=
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0)
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return error_status;
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// We don't know the header size, so write a placeholder.
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if (!seek_head_.WriteVoid(writer))
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return error_status;
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}
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seek_head_.set_info_pos(writer->Position() - segment_payload_pos_);
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if (!segment_info_.Write(writer))
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return error_status;
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seek_head_.set_tracks_pos(writer->Position() - segment_payload_pos_);
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if (!tracks_.Write(writer))
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return error_status;
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return Status::OK;
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}
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Status Segmenter::SetCluster(uint64_t start_webm_timecode,
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uint64_t position,
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MkvWriter* writer) {
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const uint64_t scale = segment_info_.timecode_scale();
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cluster_.reset(new mkvmuxer::Cluster(start_webm_timecode, position, scale));
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cluster_->Init(writer);
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return Status::OK;
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}
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void Segmenter::UpdateProgress(uint64_t progress) {
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accumulated_progress_ += progress;
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if (!progress_listener_ || progress_target_ == 0)
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return;
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// It might happen that accumulated progress exceeds progress_target due to
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// computation errors, e.g. rounding error. Cap it so it never reports > 100%
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// progress.
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if (accumulated_progress_ >= progress_target_) {
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progress_listener_->OnProgress(1.0);
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} else {
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progress_listener_->OnProgress(static_cast<double>(accumulated_progress_) /
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progress_target_);
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}
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}
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Status Segmenter::CreateVideoTrack(VideoStreamInfo* info) {
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// The seed is only used to create a UID which we overwrite later.
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unsigned int seed = 0;
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mkvmuxer::VideoTrack* track = new mkvmuxer::VideoTrack(&seed);
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if (!track)
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return Status(error::INTERNAL_ERROR, "Failed to create video track.");
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if (info->codec() == kCodecVP8) {
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track->set_codec_id(mkvmuxer::Tracks::kVp8CodecId);
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} else if (info->codec() == kCodecVP9) {
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track->set_codec_id(mkvmuxer::Tracks::kVp9CodecId);
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// The |StreamInfo::codec_config| field is stored using the MP4 format; we
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// need to convert it to the WebM format.
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VPCodecConfigurationRecord vp_config;
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if (!vp_config.ParseMP4(info->codec_config())) {
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return Status(error::INTERNAL_ERROR,
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"Unable to parse VP9 codec configuration");
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}
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std::vector<uint8_t> codec_config;
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vp_config.WriteWebM(&codec_config);
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if (!track->SetCodecPrivate(codec_config.data(), codec_config.size())) {
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return Status(error::INTERNAL_ERROR,
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"Private codec data required for VP9 streams");
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}
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} else {
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LOG(ERROR) << "Only VP8 and VP9 video codecs are supported.";
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return Status(error::UNIMPLEMENTED,
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"Only VP8 and VP9 video codecs are supported.");
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}
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track->set_uid(info->track_id());
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if (!info->language().empty())
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track->set_language(info->language().c_str());
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track->set_type(mkvmuxer::Tracks::kVideo);
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track->set_width(info->width());
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track->set_height(info->height());
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track->set_display_height(info->height());
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track->set_display_width(info->width() * info->pixel_width() /
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info->pixel_height());
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if (encryptor_)
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encryptor_->AddTrackInfo(track);
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tracks_.AddTrack(track, info->track_id());
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track_id_ = track->number();
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return Status::OK;
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}
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Status Segmenter::CreateAudioTrack(AudioStreamInfo* info) {
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// The seed is only used to create a UID which we overwrite later.
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unsigned int seed = 0;
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mkvmuxer::AudioTrack* track = new mkvmuxer::AudioTrack(&seed);
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if (!track)
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return Status(error::INTERNAL_ERROR, "Failed to create audio track.");
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if (info->codec() == kCodecOpus) {
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track->set_codec_id(mkvmuxer::Tracks::kOpusCodecId);
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} else if (info->codec() == kCodecVorbis) {
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track->set_codec_id(mkvmuxer::Tracks::kVorbisCodecId);
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} else {
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LOG(ERROR) << "Only Vorbis and Opus audio codec is supported.";
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return Status(error::UNIMPLEMENTED,
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"Only Vorbis and Opus audio codecs are supported.");
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}
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if (!track->SetCodecPrivate(info->codec_config().data(),
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info->codec_config().size())) {
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return Status(error::INTERNAL_ERROR,
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"Private codec data required for audio streams");
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}
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track->set_uid(info->track_id());
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if (!info->language().empty())
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track->set_language(info->language().c_str());
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track->set_type(mkvmuxer::Tracks::kAudio);
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track->set_sample_rate(info->sampling_frequency());
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track->set_channels(info->num_channels());
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track->set_seek_pre_roll(info->seek_preroll_ns());
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track->set_codec_delay(info->codec_delay_ns());
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if (encryptor_)
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encryptor_->AddTrackInfo(track);
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tracks_.AddTrack(track, info->track_id());
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track_id_ = track->number();
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return Status::OK;
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}
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Status Segmenter::InitializeEncryptor(KeySource* key_source,
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uint32_t max_sd_pixels,
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uint32_t max_hd_pixels,
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uint32_t max_uhd1_pixels) {
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encryptor_.reset(new Encryptor());
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const KeySource::TrackType track_type =
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GetTrackTypeForEncryption(*info_, max_sd_pixels, max_hd_pixels,
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max_uhd1_pixels);
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if (track_type == KeySource::TrackType::TRACK_TYPE_UNKNOWN)
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return Status::OK;
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return encryptor_->Initialize(muxer_listener_, track_type, info_->codec(),
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key_source, options_.webm_subsample_encryption);
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}
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Status Segmenter::WriteFrame(bool write_duration) {
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// Create a frame manually so we can create non-SimpleBlock frames. This
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// is required to allow the frame duration to be added. If the duration
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// is not set, then a SimpleBlock will still be written.
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mkvmuxer::Frame frame;
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if (!frame.Init(prev_sample_->data(), prev_sample_->data_size())) {
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return Status(error::MUXER_FAILURE,
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"Error adding sample to segment: Frame::Init failed");
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}
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if (write_duration) {
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const uint64_t duration_ns =
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prev_sample_->duration() * kSecondsToNs / info_->time_scale();
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frame.set_duration(duration_ns);
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}
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frame.set_is_key(prev_sample_->is_key_frame());
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frame.set_timestamp(prev_sample_->pts() * kSecondsToNs / info_->time_scale());
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frame.set_track_number(track_id_);
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if (prev_sample_->side_data_size() > 0) {
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uint64_t block_add_id;
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// First 8 bytes of side_data is the BlockAddID element's value, which is
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// done to mimic ffmpeg behavior. See webm_cluster_parser.cc for details.
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CHECK_GT(prev_sample_->side_data_size(), sizeof(block_add_id));
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memcpy(&block_add_id, prev_sample_->side_data(), sizeof(block_add_id));
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if (!frame.AddAdditionalData(
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prev_sample_->side_data() + sizeof(block_add_id),
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prev_sample_->side_data_size() - sizeof(block_add_id),
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block_add_id)) {
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return Status(
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error::MUXER_FAILURE,
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"Error adding sample to segment: Frame::AddAditionalData Failed");
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}
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}
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if (!prev_sample_->is_key_frame() && !frame.CanBeSimpleBlock()) {
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const int64_t timestamp_ns =
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reference_frame_timestamp_ * kSecondsToNs / info_->time_scale();
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frame.set_reference_block_timestamp(timestamp_ns);
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}
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// GetRelativeTimecode will return -1 if the relative timecode is too large
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// to fit in the frame.
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if (cluster_->GetRelativeTimecode(frame.timestamp() /
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cluster_->timecode_scale()) < 0) {
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const double segment_duration =
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static_cast<double>(frame.timestamp()) / kSecondsToNs;
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LOG(ERROR) << "Error adding sample to segment: segment too large, "
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<< segment_duration << " seconds.";
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return Status(error::MUXER_FAILURE,
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"Error adding sample to segment: segment too large");
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}
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if (!cluster_->AddFrame(&frame)) {
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return Status(error::MUXER_FAILURE,
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"Error adding sample to segment: Cluster::AddFrame failed");
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}
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// A reference frame is needed for non-keyframes. Having a reference to the
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// previous block is good enough.
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// See libwebm Segment::AddGenericFrame
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reference_frame_timestamp_ = prev_sample_->pts();
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return Status::OK;
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}
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} // namespace webm
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} // namespace media
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} // namespace shaka
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