85 lines
1.9 KiB
C++
85 lines
1.9 KiB
C++
|
// Copyright (c) 2011 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_info_parser.h"
|
||
|
|
|
||
|
|
#include "base/logging.h"
|
||
|
|
#include "media/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* 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 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* data, int size) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool WebMInfoParser::OnString(int id, const std::string& str) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace media
|