113 lines
2.7 KiB
C++
113 lines
2.7 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_info_parser.h>
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#include <ctime>
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#include <absl/log/log.h>
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#include <packager/macros/logging.h>
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#include <packager/media/formats/webm/webm_constants.h>
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namespace shaka {
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namespace media {
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// Default timecode scale if the TimecodeScale element is
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// not specified in the INFO element.
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static const int kWebMDefaultTimecodeScale = 1000000;
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WebMInfoParser::WebMInfoParser()
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: timecode_scale_(-1),
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duration_(-1) {
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}
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WebMInfoParser::~WebMInfoParser() {}
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int WebMInfoParser::Parse(const uint8_t* buf, int size) {
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timecode_scale_ = -1;
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duration_ = -1;
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WebMListParser parser(kWebMIdInfo, 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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WebMParserClient* WebMInfoParser::OnListStart(int /*id*/) {
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return this;
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}
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bool WebMInfoParser::OnListEnd(int id) {
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if (id == kWebMIdInfo && timecode_scale_ == -1) {
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// Set timecode scale to default value if it isn't present in
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// the Info element.
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timecode_scale_ = kWebMDefaultTimecodeScale;
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}
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return true;
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}
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bool WebMInfoParser::OnUInt(int id, int64_t val) {
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if (id != kWebMIdTimecodeScale)
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return true;
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if (timecode_scale_ != -1) {
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DVLOG(1) << "Multiple values for id " << std::hex << id << " specified";
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return false;
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}
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timecode_scale_ = val;
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return true;
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}
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bool WebMInfoParser::OnFloat(int id, double val) {
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if (id != kWebMIdDuration) {
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DVLOG(1) << "Unexpected float for id" << std::hex << id;
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return false;
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}
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if (duration_ != -1) {
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DVLOG(1) << "Multiple values for duration.";
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return false;
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}
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duration_ = val;
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return true;
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}
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bool WebMInfoParser::OnBinary(int id, const uint8_t* data, int size) {
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if (id == kWebMIdDateUTC) {
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if (size != 8)
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return false;
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int64_t date_in_nanoseconds = 0;
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for (int i = 0; i < size; ++i)
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date_in_nanoseconds = (date_in_nanoseconds << 8) | data[i];
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std::tm exploded_epoch;
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exploded_epoch.tm_year = 2001;
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exploded_epoch.tm_mon = 1;
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exploded_epoch.tm_mday = 1;
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exploded_epoch.tm_hour = 0;
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exploded_epoch.tm_min = 0;
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exploded_epoch.tm_sec = 0;
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date_utc_ =
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std::chrono::system_clock::from_time_t(std::mktime(&exploded_epoch)) +
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std::chrono::microseconds(date_in_nanoseconds / 1000);
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}
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return true;
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}
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bool WebMInfoParser::OnString(int /*id*/, const std::string& /*str*/) {
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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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