Tag Parser 10.3.1
C++ library for reading and writing MP4 (iTunes), ID3, Vorbis, Opus, FLAC and Matroska tags
abstracttrack.cpp
Go to the documentation of this file.
1#include "./abstracttrack.h"
2#include "./exceptions.h"
3#include "./mediaformat.h"
4
5#include "./mp4/mp4ids.h"
6
8
9using namespace std;
10using namespace CppUtilities;
11
12namespace TagParser {
13
30AbstractTrack::AbstractTrack(istream &inputStream, ostream &outputStream, std::uint64_t startOffset)
31 : m_istream(&inputStream)
32 , m_ostream(&outputStream)
33 , m_reader(BinaryReader(&inputStream))
34 , m_writer(BinaryWriter(&outputStream))
35 , m_startOffset(startOffset)
37 , m_format()
38 , m_mediaType(MediaType::Unknown)
39 , m_version(0.0)
40 , m_size(0)
41 , m_trackNumber(0)
42 , m_id(0)
43 , m_bitrate(0.0)
44 , m_maxBitrate(0.0)
45 , m_samplingFrequency(0)
46 , m_extensionSamplingFrequency(0)
47 , m_bitsPerSample(0)
48 , m_bytesPerSecond(0)
49 , m_channelCount(0)
50 , m_channelConfig(0)
51 , m_extensionChannelConfig(0)
52 , m_sampleCount(0)
53 , m_quality(0)
54 , m_depth(0)
55 , m_fps(0)
56 , m_timeScale(0)
57 , m_colorSpace(0)
58{
59}
60
68AbstractTrack::AbstractTrack(std::iostream &stream, std::uint64_t startOffset)
69 : AbstractTrack(stream, stream, startOffset)
70{
71}
72
77{
78}
79
83std::string_view AbstractTrack::channelConfigString() const
84{
85 switch (m_format.general) {
91 default:
92 return std::string_view();
93 }
94}
95
100{
102}
103
108{
109 switch (m_format.general) {
112 default:
113 return std::string_view();
114 }
115}
116
124{
125 stringstream ss;
126 ss << "ID: " << id();
127 ss << ", type: " << mediaTypeName();
128 if (!name().empty()) {
129 ss << ", name: \"" << name() << "\"";
130 }
131 if (const auto &language = locale().fullOrSomeAbbreviatedName(); !language.empty()) {
132 ss << ", language: " << language << "";
133 }
134 return ss.str();
135}
136
138string AbstractTrack::makeDescription(bool verbose) const
139{
140 // use abbreviated format
141 const auto format = MediaFormat(m_format.general, verbose ? m_format.sub : 0, verbose ? m_format.extension : 0);
143 if (formatName.empty()) {
144 // fall back to media type name if no abbreviation available
146 }
147
148 // find additional info and level
149 auto additionalInfoRef = std::string_view();
150 auto level = std::string();
151 switch (m_mediaType) {
152 case MediaType::Video:
153 if (!displaySize().isNull()) {
154 additionalInfoRef = displaySize().abbreviation();
155 } else if (!pixelSize().isNull()) {
156 additionalInfoRef = pixelSize().abbreviation();
157 }
158 if (verbose) {
159 switch (format.general) {
163 if (version() != 0.0) {
164 level = "@L" + numberToString(version());
165 }
166 break;
167 default:;
168 }
169 }
170 break;
171 case MediaType::Audio:
172 case MediaType::Text:
173 if (channelCount()) {
174 if (const auto &localeName = locale().someAbbreviatedName(); !localeName.empty()) {
175 return argsToString(formatName, '-', channelCount(), "ch-", localeName);
176 } else {
177 return argsToString(formatName, '-', channelCount(), 'c', 'h');
178 }
179 } else if (const auto &localeName = locale().someAbbreviatedName(); !localeName.empty()) {
180 additionalInfoRef = localeName;
181 }
182 break;
183 default:;
184 }
185
186 if (!additionalInfoRef.empty()) {
187 return argsToString(formatName, level, '-', additionalInfoRef);
188 }
189 return argsToString(formatName, level);
190}
192
205{
206 return makeDescription(true);
207}
208
219{
220 return makeDescription(false);
221}
222
236{
238 m_istream->seekg(static_cast<streamoff>(m_startOffset), ios_base::beg);
239 try {
240 internalParseHeader(diag, progress);
242 } catch (const Failure &) {
243 throw;
244 }
245}
246
257} // namespace TagParser
The AbortableProgressFeedback class provides feedback about an ongoing operation via callbacks.
The AbstractTrack class parses and stores technical information about video, audio and other kinds of...
Definition: abstracttrack.h:65
std::uint64_t id() const
Returns the track ID if known; otherwise returns 0.
std::string label() const
Returns a label for the track.
std::uint8_t m_extensionChannelConfig
const Locale & locale() const
Returns the locale of the track if known; otherwise returns an empty locale.
std::string_view extensionChannelConfigString() const
Returns a string with the extension channel configuration if available; otherwise returns nullptr.
std::string_view formatName() const
Returns the format of the track as C-style string if known; otherwise returns the format abbreviation...
const Size & displaySize() const
Returns the size of the video frames to display if known; otherwise returns a zero size.
double version() const
Returns the version/level of the track if known; otherwise returns 0.
const Size & pixelSize() const
Returns the size of the encoded video frames if known; otherwise returns a zero size.
std::uint8_t extensionChannelConfig() const
Returns the extension channel configuration if available; otherwise returns nullptr.
AbstractTrack(std::istream &inputStream, std::ostream &outputStream, std::uint64_t startOffset)
Constructs a new track.
std::uint8_t m_channelConfig
std::string shortDescription() const
Returns a short description about the track.
std::string_view mediaTypeName() const
Returns the string representation of the media type of the track.
std::uint64_t m_startOffset
void parseHeader(Diagnostics &diag, AbortableProgressFeedback &progress)
Parses technical information about the track from the header.
std::uint16_t channelCount() const
Returns the number of channels if known; otherwise returns 0.
std::string_view channelConfigString() const
Returns a string with the channel configuration if available; otherwise returns nullptr.
virtual void internalParseHeader(Diagnostics &diag, AbortableProgressFeedback &progress)=0
This method is internally called to parse header information.
const std::string name() const
Returns the track name if known; otherwise returns an empty string.
std::istream * m_istream
std::string description() const
Returns a description about the track.
MediaFormat format() const
Returns the format of the track if known; otherwise returns MediaFormat::Unknown.
virtual ~AbstractTrack()
Destroys the track.
The Diagnostics class is a container for DiagMessage.
Definition: diagnostics.h:156
The class inherits from std::exception and serves as base class for exceptions thrown by the elements...
Definition: exceptions.h:11
The MediaFormat class specifies the format of media data.
Definition: mediaformat.h:246
std::string_view shortAbbreviation() const
Returns a short abbreviation of the media format as C-style string.
unsigned char extension
Definition: mediaformat.h:261
GeneralMediaFormat general
Definition: mediaformat.h:259
std::string_view abbreviation() const
Returns an abbreviation for the current instance, eg.
Definition: size.cpp:17
constexpr TAG_PARSER_EXPORT std::string_view language()
TAG_PARSER_EXPORT std::string_view channelConfigString(std::uint8_t config)
Returns the string representation for the specified MPEG-4 channel config.
Definition: mp4ids.cpp:433
Contains all classes and functions of the TagInfo library.
Definition: aaccodebook.h:10
TAG_PARSER_EXPORT std::string_view mpegChannelModeString(MpegChannelMode channelMode)
Returns the string representation for the specified channelMode.
MediaType
The MediaType enum specifies the type of media data (audio, video, text, ...).
Definition: mediaformat.h:14
MpegChannelMode
Specifies the channel mode.
TrackFlags
The TrackFlags enum specifies miscellaneous boolean properties of a track.
Definition: abstracttrack.h:46