Tag Parser  9.1.2
C++ library for reading and writing MP4 (iTunes), ID3, Vorbis, Opus, FLAC and Matroska tags
abstracttrack.cpp
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1 #include "./abstracttrack.h"
2 #include "./exceptions.h"
3 #include "./language.h"
4 #include "./mediaformat.h"
5 
6 #include "./mp4/mp4ids.h"
7 
9 
10 using namespace std;
11 using namespace CppUtilities;
12 
13 namespace TagParser {
14 
31 AbstractTrack::AbstractTrack(istream &inputStream, ostream &outputStream, std::uint64_t startOffset)
32  : m_istream(&inputStream)
33  , m_ostream(&outputStream)
34  , m_reader(BinaryReader(&inputStream))
35  , m_writer(BinaryWriter(&outputStream))
36  , m_startOffset(startOffset)
37  , m_headerValid(false)
38  , m_format()
39  , m_mediaType(MediaType::Unknown)
40  , m_version(0.0)
41  , m_size(0)
42  , m_trackNumber(0)
43  , m_id(0)
44  , m_bitrate(0.0)
45  , m_maxBitrate(0.0)
46  , m_samplingFrequency(0)
47  , m_extensionSamplingFrequency(0)
48  , m_bitsPerSample(0)
49  , m_bytesPerSecond(0)
50  , m_channelCount(0)
51  , m_channelConfig(0)
52  , m_extensionChannelConfig(0)
53  , m_sampleCount(0)
54  , m_quality(0)
55  , m_depth(0)
56  , m_fps(0)
57  , m_chromaFormat(nullptr)
58  , m_interlaced(false)
59  , m_timeScale(0)
60  , m_enabled(true)
61  , m_default(false)
62  , m_forced(false)
63  , m_lacing(false)
64  , m_encrypted(false)
65  , m_usedInPresentation(true)
66  , m_usedWhenPreviewing(true)
67  , m_colorSpace(0)
68 {
69 }
70 
78 AbstractTrack::AbstractTrack(std::iostream &stream, std::uint64_t startOffset)
79  : AbstractTrack(stream, stream, startOffset)
80 {
81 }
82 
87 {
88 }
89 
94 {
95  switch (m_format.general) {
101  default:
102  return nullptr;
103  }
104 }
105 
110 {
112 }
113 
118 {
119  switch (m_format.general) {
122  default:
123  return nullptr;
124  }
125 }
126 
133 string AbstractTrack::label() const
134 {
135  stringstream ss;
136  ss << "ID: " << id();
137  ss << ", type: " << mediaTypeName();
138  if (!name().empty()) {
139  ss << ", name: \"" << name() << "\"";
140  }
141  if (isLanguageDefined(language())) {
142  ss << ", language: " << languageNameFromIsoWithFallback(language()) << "";
143  }
144  return ss.str();
145 }
146 
159 {
160  // use abbreviated format
161  const char *format = m_format.shortAbbreviation();
162  if (!format || !*format) {
163  // fall back to media type name if no abbreviation available
164  format = mediaTypeName();
165  }
166 
167  // find additional info
168  const char *additionalInfo = nullptr;
169  switch (m_mediaType) {
170  case MediaType::Video:
171  if (!displaySize().isNull()) {
172  additionalInfo = displaySize().abbreviation();
173  } else if (!pixelSize().isNull()) {
174  additionalInfo = pixelSize().abbreviation();
175  }
176  break;
177  case MediaType::Audio:
178  case MediaType::Text:
179  if (channelCount()) {
180  if (!language().empty() && language() != "und") {
181  return argsToString(format, '-', channelCount(), "ch-", language());
182  } else {
183  return argsToString(format, '-', channelCount(), 'c', 'h');
184  }
185  } else if (!language().empty() && language() != "und") {
186  additionalInfo = language().data();
187  }
188  break;
189  default:;
190  }
191 
192  if (additionalInfo) {
193  return argsToString(format, '-', additionalInfo);
194  }
195  return format;
196 }
197 
211 {
212  m_headerValid = false;
213  m_istream->seekg(static_cast<streamoff>(m_startOffset), ios_base::beg);
214  try {
215  internalParseHeader(diag);
216  m_headerValid = true;
217  } catch (Failure &) {
218  throw;
219  }
220 }
221 
232 } // namespace TagParser
mp4ids.h
TagParser::MediaType::Text
@ Text
TagParser::GeneralMediaFormat::Aac
@ Aac
TagParser::MediaType::Audio
@ Audio
exceptions.h
TagParser::GeneralMediaFormat::Mpeg2Audio
@ Mpeg2Audio
TagParser::AbstractTrack::channelCount
std::uint16_t channelCount() const
Returns the number of channels if known; otherwise returns 0.
Definition: abstracttrack.h:457
TagParser::AbstractTrack::channelConfigString
const char * channelConfigString() const
Returns a string with the channel configuration if available; otherwise returns nullptr.
Definition: abstracttrack.cpp:93
TagParser::AbstractTrack::label
std::string label() const
Returns a label for the track.
Definition: abstracttrack.cpp:133
TagParser::MpegChannelMode
MpegChannelMode
Specifies the channel mode.
Definition: mpegaudioframe.h:18
mpegaudioframe.h
TagParser::AbstractTrack::extensionChannelConfig
std::uint8_t extensionChannelConfig() const
Returns the extension channel configuration if available; otherwise returns nullptr.
Definition: abstracttrack.cpp:109
TagParser::Diagnostics
The Diagnostics class is a container for DiagMessage.
Definition: diagnostics.h:156
TagParser
Contains all classes and functions of the TagInfo library.
Definition: aaccodebook.h:10
TagParser::languageNameFromIsoWithFallback
const TAG_PARSER_EXPORT std::string & languageNameFromIsoWithFallback(const std::string &isoCode)
Returns the language name for the specified ISO-639-2 code (bibliographic, 639-2/B).
Definition: language.cpp:34
TagParser::isLanguageDefined
bool isLanguageDefined(const std::string &languageSpecification)
Returns whether languageSpecification is not empty or undefined.
Definition: language.h:16
TagParser::AbstractTrack::format
MediaFormat format() const
Returns the format of the track if known; otherwise returns MediaFormat::Unknown.
Definition: abstracttrack.h:249
TagParser::Failure
The class inherits from std::exception and serves as base class for exceptions thrown by the elements...
Definition: exceptions.h:11
TagParser::AbstractTrack::~AbstractTrack
virtual ~AbstractTrack()
Destroys the track.
Definition: abstracttrack.cpp:86
TagParser::mpegChannelModeString
const TAG_PARSER_EXPORT char * mpegChannelModeString(MpegChannelMode channelMode)
Returns the string representation for the specified channelMode.
Definition: mpegaudioframe.cpp:15
TagParser::MediaFormat::shortAbbreviation
const char * shortAbbreviation() const
Returns a short abbreviation of the media format as C-style string.
Definition: mediaformat.cpp:730
TagParser::MediaType
MediaType
The MediaType enum specifies the type of media data (audio, video, text, ...).
Definition: mediaformat.h:13
language.h
TagParser::AbstractTrack::m_headerValid
bool m_headerValid
Definition: abstracttrack.h:123
CppUtilities
Definition: abstractcontainer.h:15
TagParser::AbstractTrack::parseHeader
void parseHeader(Diagnostics &diag)
Parses technical information about the track from the header.
Definition: abstracttrack.cpp:210
TagParser::AbstractTrack
The AbstractTrack class parses and stores technical information about video, audio and other kinds of...
Definition: abstracttrack.h:39
TagParser::AbstractTrack::description
std::string description() const
Returns a short description about the track.
Definition: abstracttrack.cpp:158
TagParser::AbstractTrack::m_mediaType
MediaType m_mediaType
Definition: abstracttrack.h:127
TagParser::MediaFormat::general
GeneralMediaFormat general
Definition: mediaformat.h:258
TagParser::AbstractTrack::m_startOffset
std::uint64_t m_startOffset
Definition: abstracttrack.h:122
abstracttrack.h
TagParser::AbstractTrack::m_format
MediaFormat m_format
Definition: abstracttrack.h:124
TagParser::AbstractTrack::language
const std::string & language() const
Returns the language of the track if known; otherwise returns an empty string.
Definition: abstracttrack.h:413
TagParser::AbstractTrack::id
std::uint64_t id() const
Returns the track ID if known; otherwise returns 0.
Definition: abstracttrack.h:337
TagParser::AbstractTrack::AbstractTrack
AbstractTrack(std::istream &inputStream, std::ostream &outputStream, std::uint64_t startOffset)
Constructs a new track.
Definition: abstracttrack.cpp:31
TagParser::AbstractTrack::m_channelConfig
std::uint8_t m_channelConfig
Definition: abstracttrack.h:144
mediaformat.h
TagParser::AbstractTrack::displaySize
const Size & displaySize() const
Returns the size of the video frames to display if known; otherwise returns a zero size.
Definition: abstracttrack.h:506
TagParser::GeneralMediaFormat::Mpeg1Audio
@ Mpeg1Audio
TagParser::MediaType::Video
@ Video
TagParser::AbstractTrack::pixelSize
const Size & pixelSize() const
Returns the size of the encoded video frames if known; otherwise returns a zero size.
Definition: abstracttrack.h:496
TagParser::AbstractTrack::internalParseHeader
virtual void internalParseHeader(Diagnostics &diag)=0
This method is internally called to parse header information. It needs to be implemented when subclas...
TagParser::AbstractTrack::mediaTypeName
const char * mediaTypeName() const
Returns the string representation of the media type of the track.
Definition: abstracttrack.h:304
TagParser::Mpeg4ChannelConfigs::channelConfigString
const TAG_PARSER_EXPORT char * channelConfigString(std::uint8_t config)
Returns the string representation for the specified MPEG-4 channel config.
Definition: mp4ids.cpp:432
TagParser::Size::abbreviation
const char * abbreviation() const
Returns an abbreviation for the current instance, eg.
Definition: size.cpp:9
TagParser::AbstractTrack::extensionChannelConfigString
const char * extensionChannelConfigString() const
Returns a string with the extension channel configuration if available; otherwise returns nullptr.
Definition: abstracttrack.cpp:117
TagParser::AbstractTrack::name
const std::string name() const
Returns the track name if known; otherwise returns an empty string.
Definition: abstracttrack.h:354
TagParser::AbstractTrack::m_istream
std::istream * m_istream
Definition: abstracttrack.h:118
TagParser::MatroskaElementLevel::Unknown
@ Unknown
TagParser::AbstractTrack::m_extensionChannelConfig
std::uint8_t m_extensionChannelConfig
Definition: abstracttrack.h:145