346 lines
9.8 KiB
C++
346 lines
9.8 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "packager/media/formats/webm/webm_tracks_parser.h"
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#include "packager/base/logging.h"
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#include "packager/base/strings/string_number_conversions.h"
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#include "packager/base/strings/string_util.h"
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#include "packager/media/base/timestamp.h"
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#include "packager/media/formats/webm/webm_constants.h"
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#include "packager/media/formats/webm/webm_content_encodings.h"
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namespace shaka {
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namespace media {
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static TextKind CodecIdToTextKind(const std::string& codec_id) {
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if (codec_id == kWebMCodecSubtitles)
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return kTextSubtitles;
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if (codec_id == kWebMCodecCaptions)
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return kTextCaptions;
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if (codec_id == kWebMCodecDescriptions)
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return kTextDescriptions;
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if (codec_id == kWebMCodecMetadata)
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return kTextMetadata;
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return kTextNone;
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}
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static int64_t PrecisionCappedDefaultDuration(
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const double timecode_scale_in_us,
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const int64_t duration_in_ns) {
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if (duration_in_ns <= 0)
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return kNoTimestamp;
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int64_t mult = duration_in_ns / 1000;
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mult /= timecode_scale_in_us;
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if (mult == 0)
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return kNoTimestamp;
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mult = static_cast<double>(mult) * timecode_scale_in_us;
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return mult;
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}
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WebMTracksParser::WebMTracksParser(bool ignore_text_tracks)
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: track_type_(-1),
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track_num_(-1),
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seek_preroll_(-1),
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codec_delay_(-1),
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default_duration_(-1),
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audio_track_num_(-1),
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audio_default_duration_(-1),
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video_track_num_(-1),
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video_default_duration_(-1),
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ignore_text_tracks_(ignore_text_tracks),
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audio_client_(),
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video_client_() {
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}
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WebMTracksParser::~WebMTracksParser() {}
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int WebMTracksParser::Parse(const uint8_t* buf, int size) {
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track_type_ =-1;
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track_num_ = -1;
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default_duration_ = -1;
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track_name_.clear();
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track_language_.clear();
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audio_track_num_ = -1;
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audio_default_duration_ = -1;
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audio_stream_info_ = nullptr;
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video_track_num_ = -1;
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video_default_duration_ = -1;
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video_stream_info_ = nullptr;
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text_tracks_.clear();
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ignored_tracks_.clear();
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WebMListParser parser(kWebMIdTracks, this);
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int result = parser.Parse(buf, size);
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if (result <= 0)
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return result;
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// For now we do all or nothing parsing.
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return parser.IsParsingComplete() ? result : 0;
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}
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int64_t WebMTracksParser::GetAudioDefaultDuration(
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const double timecode_scale_in_us) const {
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return PrecisionCappedDefaultDuration(timecode_scale_in_us,
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audio_default_duration_);
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}
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int64_t WebMTracksParser::GetVideoDefaultDuration(
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const double timecode_scale_in_us) const {
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return PrecisionCappedDefaultDuration(timecode_scale_in_us,
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video_default_duration_);
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}
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WebMParserClient* WebMTracksParser::OnListStart(int id) {
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if (id == kWebMIdContentEncodings) {
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DCHECK(!track_content_encodings_client_.get());
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track_content_encodings_client_.reset(new WebMContentEncodingsClient());
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return track_content_encodings_client_->OnListStart(id);
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}
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if (id == kWebMIdTrackEntry) {
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track_type_ = -1;
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track_num_ = -1;
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default_duration_ = -1;
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track_name_.clear();
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track_language_.clear();
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codec_id_ = "";
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codec_private_.clear();
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audio_client_.Reset();
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video_client_.Reset();
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return this;
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}
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if (id == kWebMIdAudio)
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return &audio_client_;
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if (id == kWebMIdVideo)
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return &video_client_;
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return this;
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}
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bool WebMTracksParser::OnListEnd(int id) {
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if (id == kWebMIdContentEncodings) {
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DCHECK(track_content_encodings_client_.get());
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return track_content_encodings_client_->OnListEnd(id);
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}
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if (id == kWebMIdTrackEntry) {
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if (track_type_ == -1 || track_num_ == -1) {
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LOG(ERROR) << "Missing TrackEntry data for "
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<< " TrackType " << track_type_ << " TrackNum " << track_num_;
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return false;
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}
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if (track_type_ != kWebMTrackTypeAudio &&
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track_type_ != kWebMTrackTypeVideo &&
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track_type_ != kWebMTrackTypeSubtitlesOrCaptions &&
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track_type_ != kWebMTrackTypeDescriptionsOrMetadata) {
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LOG(ERROR) << "Unexpected TrackType " << track_type_;
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return false;
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}
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TextKind text_track_kind = kTextNone;
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if (track_type_ == kWebMTrackTypeSubtitlesOrCaptions) {
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text_track_kind = CodecIdToTextKind(codec_id_);
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if (text_track_kind == kTextNone) {
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LOG(ERROR) << "Missing TrackEntry CodecID"
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<< " TrackNum " << track_num_;
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return false;
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}
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if (text_track_kind != kTextSubtitles &&
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text_track_kind != kTextCaptions) {
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LOG(ERROR) << "Wrong TrackEntry CodecID"
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<< " TrackNum " << track_num_;
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return false;
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}
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} else if (track_type_ == kWebMTrackTypeDescriptionsOrMetadata) {
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text_track_kind = CodecIdToTextKind(codec_id_);
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if (text_track_kind == kTextNone) {
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LOG(ERROR) << "Missing TrackEntry CodecID"
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<< " TrackNum " << track_num_;
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return false;
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}
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if (text_track_kind != kTextDescriptions &&
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text_track_kind != kTextMetadata) {
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LOG(ERROR) << "Wrong TrackEntry CodecID"
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<< " TrackNum " << track_num_;
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return false;
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}
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}
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std::string encryption_key_id;
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if (track_content_encodings_client_) {
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DCHECK(!track_content_encodings_client_->content_encodings().empty());
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// If we have multiple ContentEncoding in one track. Always choose the
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// key id in the first ContentEncoding as the key id of the track.
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encryption_key_id = track_content_encodings_client_->
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content_encodings()[0]->encryption_key_id();
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}
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if (track_type_ == kWebMTrackTypeAudio) {
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if (audio_track_num_ == -1) {
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audio_track_num_ = track_num_;
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audio_encryption_key_id_ = encryption_key_id;
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if (default_duration_ == 0) {
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LOG(ERROR) << "Illegal 0ns audio TrackEntry "
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"DefaultDuration";
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return false;
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}
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audio_default_duration_ = default_duration_;
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DCHECK(!audio_stream_info_);
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audio_stream_info_ = audio_client_.GetAudioStreamInfo(
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audio_track_num_, codec_id_, codec_private_, seek_preroll_,
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codec_delay_, track_language_, !audio_encryption_key_id_.empty());
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if (!audio_stream_info_)
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return false;
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} else {
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DLOG(INFO) << "Ignoring audio track " << track_num_;
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ignored_tracks_.insert(track_num_);
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}
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} else if (track_type_ == kWebMTrackTypeVideo) {
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if (video_track_num_ == -1) {
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video_track_num_ = track_num_;
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video_encryption_key_id_ = encryption_key_id;
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if (default_duration_ == 0) {
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LOG(ERROR) << "Illegal 0ns video TrackEntry "
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"DefaultDuration";
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return false;
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}
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video_default_duration_ = default_duration_;
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// |vp_config_| is only useful for VP8 and VP9.
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if (codec_id_ == "V_VP8" || codec_id_ == "V_VP9")
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vp_config_ = video_client_.GetVpCodecConfig(codec_private_);
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DCHECK(!video_stream_info_);
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video_stream_info_ = video_client_.GetVideoStreamInfo(
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video_track_num_, codec_id_, codec_private_,
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!video_encryption_key_id_.empty());
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if (!video_stream_info_)
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return false;
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} else {
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DLOG(INFO) << "Ignoring video track " << track_num_;
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ignored_tracks_.insert(track_num_);
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}
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} else if (track_type_ == kWebMTrackTypeSubtitlesOrCaptions ||
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track_type_ == kWebMTrackTypeDescriptionsOrMetadata) {
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if (ignore_text_tracks_) {
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DLOG(INFO) << "Ignoring text track " << track_num_;
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ignored_tracks_.insert(track_num_);
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} else {
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std::string track_num = base::Int64ToString(track_num_);
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text_tracks_[track_num_] = TextTrackConfig(
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text_track_kind, track_name_, track_language_, track_num);
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}
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} else {
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LOG(ERROR) << "Unexpected TrackType " << track_type_;
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return false;
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}
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track_type_ = -1;
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track_num_ = -1;
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default_duration_ = -1;
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track_name_.clear();
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track_language_.clear();
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codec_id_ = "";
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codec_private_.clear();
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track_content_encodings_client_.reset();
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audio_client_.Reset();
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video_client_.Reset();
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return true;
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}
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return true;
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}
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bool WebMTracksParser::OnUInt(int id, int64_t val) {
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int64_t* dst = NULL;
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switch (id) {
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case kWebMIdTrackNumber:
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dst = &track_num_;
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break;
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case kWebMIdTrackType:
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dst = &track_type_;
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break;
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case kWebMIdSeekPreRoll:
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dst = &seek_preroll_;
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break;
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case kWebMIdCodecDelay:
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dst = &codec_delay_;
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break;
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case kWebMIdDefaultDuration:
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dst = &default_duration_;
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break;
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default:
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return true;
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}
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if (*dst != -1) {
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LOG(ERROR) << "Multiple values for id " << std::hex << id << " specified";
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return false;
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}
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*dst = val;
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return true;
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}
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bool WebMTracksParser::OnFloat(int id, double val) {
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return true;
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}
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bool WebMTracksParser::OnBinary(int id, const uint8_t* data, int size) {
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if (id == kWebMIdCodecPrivate) {
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if (!codec_private_.empty()) {
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LOG(ERROR) << "Multiple CodecPrivate fields in a track.";
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return false;
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}
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codec_private_.assign(data, data + size);
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return true;
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}
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return true;
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}
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bool WebMTracksParser::OnString(int id, const std::string& str) {
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if (id == kWebMIdCodecID) {
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if (!codec_id_.empty()) {
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LOG(ERROR) << "Multiple CodecID fields in a track";
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return false;
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}
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codec_id_ = str;
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return true;
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}
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if (id == kWebMIdName) {
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track_name_ = str;
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return true;
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}
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if (id == kWebMIdLanguage) {
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track_language_ = str;
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return true;
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}
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return true;
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}
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} // namespace media
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} // namespace shaka
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