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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 "media/webm/webm_tracks_parser.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "media/base/buffers.h"
#include "media/webm/webm_constants.h"
#include "media/webm/webm_content_encodings.h"
namespace media {
// Values for TrackType element.
static const int kWebMTrackTypeVideo = 1;
static const int kWebMTrackTypeAudio = 2;
static const int kWebMTrackTypeSubtitlesOrCaptions = 0x11;
static const int kWebMTrackTypeDescriptionsOrMetadata = 0x21;
WebMTracksParser::WebMTracksParser(const LogCB& log_cb)
: track_type_(-1),
track_num_(-1),
text_track_kind_(kTextNone),
audio_track_num_(-1),
video_track_num_(-1),
log_cb_(log_cb) {
}
WebMTracksParser::~WebMTracksParser() {}
int WebMTracksParser::Parse(const uint8* buf, int size) {
track_type_ =-1;
track_num_ = -1;
text_track_kind_ = kTextNone;
audio_track_num_ = -1;
video_track_num_ = -1;
text_tracks_.clear();
ignored_tracks_.clear();
WebMListParser parser(kWebMIdTracks, this);
int result = parser.Parse(buf, size);
if (result <= 0)
return result;
// For now we do all or nothing parsing.
return parser.IsParsingComplete() ? result : 0;
}
WebMParserClient* WebMTracksParser::OnListStart(int id) {
if (id == kWebMIdContentEncodings) {
DCHECK(!track_content_encodings_client_.get());
track_content_encodings_client_.reset(
new WebMContentEncodingsClient(log_cb_));
return track_content_encodings_client_->OnListStart(id);
}
if (id == kWebMIdTrackEntry) {
track_type_ = -1;
track_num_ = -1;
text_track_kind_ = kTextNone;
return this;
}
return this;
}
bool WebMTracksParser::OnListEnd(int id) {
if (id == kWebMIdContentEncodings) {
DCHECK(track_content_encodings_client_.get());
return track_content_encodings_client_->OnListEnd(id);
}
if (id == kWebMIdTrackEntry) {
if (track_type_ == -1 || track_num_ == -1) {
MEDIA_LOG(log_cb_) << "Missing TrackEntry data for "
<< " TrackType " << track_type_
<< " TrackNum " << track_num_;
return false;
}
if (track_type_ != kWebMTrackTypeAudio &&
track_type_ != kWebMTrackTypeVideo &&
track_type_ != kWebMTrackTypeSubtitlesOrCaptions &&
track_type_ != kWebMTrackTypeDescriptionsOrMetadata) {
MEDIA_LOG(log_cb_) << "Unexpected TrackType " << track_type_;
return false;
}
if (track_type_ == kWebMTrackTypeSubtitlesOrCaptions) {
if (text_track_kind_ == kTextNone) {
MEDIA_LOG(log_cb_) << "Missing TrackEntry CodecID"
<< " TrackNum " << track_num_;
return false;
}
if (text_track_kind_ != kTextSubtitles &&
text_track_kind_ != kTextCaptions) {
MEDIA_LOG(log_cb_) << "Wrong TrackEntry CodecID"
<< " TrackNum " << track_num_;
return false;
}
} else if (track_type_ == kWebMTrackTypeDescriptionsOrMetadata) {
if (text_track_kind_ == kTextNone) {
MEDIA_LOG(log_cb_) << "Missing TrackEntry CodecID"
<< " TrackNum " << track_num_;
return false;
}
if (text_track_kind_ != kTextDescriptions &&
text_track_kind_ != kTextMetadata) {
MEDIA_LOG(log_cb_) << "Wrong TrackEntry CodecID"
<< " TrackNum " << track_num_;
return false;
}
}
std::string encryption_key_id;
if (track_content_encodings_client_.get()) {
DCHECK(!track_content_encodings_client_->content_encodings().empty());
// If we have multiple ContentEncoding in one track. Always choose the
// key id in the first ContentEncoding as the key id of the track.
encryption_key_id = track_content_encodings_client_->
content_encodings()[0]->encryption_key_id();
}
if (track_type_ == kWebMTrackTypeAudio) {
if (audio_track_num_ == -1) {
audio_track_num_ = track_num_;
audio_encryption_key_id_ = encryption_key_id;
} else {
MEDIA_LOG(log_cb_) << "Ignoring audio track " << track_num_;
ignored_tracks_.insert(track_num_);
}
} else if (track_type_ == kWebMTrackTypeVideo) {
if (video_track_num_ == -1) {
video_track_num_ = track_num_;
video_encryption_key_id_ = encryption_key_id;
} else {
MEDIA_LOG(log_cb_) << "Ignoring video track " << track_num_;
ignored_tracks_.insert(track_num_);
}
} else if (track_type_ == kWebMTrackTypeSubtitlesOrCaptions ||
track_type_ == kWebMTrackTypeDescriptionsOrMetadata) {
text_tracks_.insert(track_num_);
} else {
MEDIA_LOG(log_cb_) << "Unexpected TrackType " << track_type_;
return false;
}
track_type_ = -1;
track_num_ = -1;
track_content_encodings_client_.reset();
text_track_kind_ = kTextNone;
return true;
}
return true;
}
bool WebMTracksParser::OnUInt(int id, int64 val) {
int64* dst = NULL;
switch (id) {
case kWebMIdTrackNumber:
dst = &track_num_;
break;
case kWebMIdTrackType:
dst = &track_type_;
break;
default:
return true;
}
if (*dst != -1) {
MEDIA_LOG(log_cb_) << "Multiple values for id " << std::hex << id
<< " specified";
return false;
}
*dst = val;
return true;
}
bool WebMTracksParser::OnFloat(int id, double val) {
return true;
}
bool WebMTracksParser::OnBinary(int id, const uint8* data, int size) {
return true;
}
bool WebMTracksParser::OnString(int id, const std::string& str) {
if (id == kWebMIdCodecID) {
if (str == "V_VP8")
return true;
if (str == "A_VORBIS")
return true;
if (str == "D_WEBVTT/SUBTITLES") {
text_track_kind_ = kTextSubtitles;
return true;
}
if (str == "D_WEBVTT/CAPTIONS") {
text_track_kind_ = kTextCaptions;
return true;
}
if (str == "D_WEBVTT/DESCRIPTIONS") {
text_track_kind_ = kTextDescriptions;
return true;
}
if (str == "D_WEBVTT/METADATA") {
text_track_kind_ = kTextMetadata;
return true;
}
MEDIA_LOG(log_cb_) << "Unexpected CodecID " << str;
return false;
}
return true;
}
} // namespace media
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