blob: 1e13ef71189da677dc8112e8d014bb69bf0258ad [file] [log] [blame]
// 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 "media/formats/webm/webm_info_parser.h"
#include "base/logging.h"
#include "media/formats/webm/webm_constants.h"
namespace media {
// Default timecode scale if the TimecodeScale element is
// not specified in the INFO element.
static const int kWebMDefaultTimecodeScale = 1000000;
WebMInfoParser::WebMInfoParser()
: timecode_scale_(-1),
duration_(-1) {
}
WebMInfoParser::~WebMInfoParser() {}
int WebMInfoParser::Parse(const uint8_t* buf, int size) {
timecode_scale_ = -1;
duration_ = -1;
WebMListParser parser(kWebMIdInfo, 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* WebMInfoParser::OnListStart(int id) { return this; }
bool WebMInfoParser::OnListEnd(int id) {
if (id == kWebMIdInfo && timecode_scale_ == -1) {
// Set timecode scale to default value if it isn't present in
// the Info element.
timecode_scale_ = kWebMDefaultTimecodeScale;
}
return true;
}
bool WebMInfoParser::OnUInt(int id, int64_t val) {
if (id != kWebMIdTimecodeScale)
return true;
if (timecode_scale_ != -1) {
DVLOG(1) << "Multiple values for id " << std::hex << id << " specified";
return false;
}
timecode_scale_ = val;
return true;
}
bool WebMInfoParser::OnFloat(int id, double val) {
if (id != kWebMIdDuration) {
DVLOG(1) << "Unexpected float for id" << std::hex << id;
return false;
}
if (duration_ != -1) {
DVLOG(1) << "Multiple values for duration.";
return false;
}
duration_ = val;
return true;
}
bool WebMInfoParser::OnBinary(int id, const uint8_t* data, int size) {
if (id == kWebMIdDateUTC) {
if (size != 8)
return false;
int64_t date_in_nanoseconds = 0;
for (int i = 0; i < size; ++i)
date_in_nanoseconds = (date_in_nanoseconds << 8) | data[i];
base::Time::Exploded exploded_epoch;
exploded_epoch.year = 2001;
exploded_epoch.month = 1;
exploded_epoch.day_of_month = 1;
exploded_epoch.day_of_week = 1;
exploded_epoch.hour = 0;
exploded_epoch.minute = 0;
exploded_epoch.second = 0;
exploded_epoch.millisecond = 0;
base::Time out_time;
if (!base::Time::FromUTCExploded(exploded_epoch, &out_time))
return false;
date_utc_ = out_time +
base::TimeDelta::FromMicroseconds(date_in_nanoseconds / 1000);
}
return true;
}
bool WebMInfoParser::OnString(int id, const std::string& str) {
return true;
}
} // namespace media