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+ General Concepts
+Before writing any code, it's recommended to understand these concepts. These apply to all of the language bindings.
+Model
+
Models end with the file extension .april. You can load these files using the AprilASR API.
Each model has its own sample rate in which it expects audio. There is a method to get the expected sample rate. Usually, this is 16000 Hz.
+Models also have additional metadata such as name, description, language.
+After loading a model, you can create one or more sessions that use the model.
+Session
+
In the most common case, you will have one session based on one model.
+The session is what performs the actual speech recognition. It has methods to input audio, and it calls your given handler with decoded results.
+ +Decoding
+
To perform speech-to-text, feed PCM16 audio of the speech to the session through the feed_pcm16 method (or equivalent in the language). Make sure it's in the correct sample rate and mono.
PCM16 means array of shorts with values between -32768 to 32767, each one describing one sample.
+After calling feed_pcm16, the session will invoke the neural network and call your specified handler with a result. You can present this result to the user or do whatever you want with the result.
Multiple sessions
+
In more advanced use cases, you may have multiple sessions performing recognition on multiple separate audio streams. When doing this, you can re-use the same model to minimize the memory use.
+Async vs Non-Async
+Synchronous session (default)
+
The simplest (and default) mode of operation are synchronous sessions.
+In a synchronous session, when you call the function to feed audio, it will process the audio synchronously, call the handler if a new result is decoded, and finally return once it's done.
+This means that calls to feed audio are extremely slow. This may be undesirable in some cases, such as in a live captioning situation. For this reason, you can choose to construct asynchronous sessions instead.
+Asynchronous session
+
An asynchronous session does not perform calculations on the calling thread.
+Calls to feed audio are quick, as it copies the data and triggers a second thread to do the actual calculations. The second thread calls the handler at some point, when processing is done.
+A caveat is that you must feed audio at a rate that comes out to 1 second per second. You should not feed multiple seconds or minutes at once. The internal buffer cannot fit more than a few seconds.
+Asynchronous sessions are intended for streaming audio as it comes in, for live captioning for example. If you feed more than 1 second every second, you will get poor results (if any).
+Async-Realtime vs Async-Non-Realtime
+In an asynchronous session, there is a problem that the system may not be fast enough to process audio at the rate that it's coming in. This is where realtime and non-realtime sessions differ in behavior.
+
A realtime session will work around this by automatically deciding to speed up incoming audio to a rate where the system can keep up. This involves some audio processing code, which may or may not be desirable.
+Speeding up audio may reduce accuracy. It may not be severe at small values (such as 1.2x), but at larger values (such as over 2.0x) the accuracy may be severely impacted. There is a method you can call to get the current speedup value to know when this is happening, so you can display a warning to the user or similar.
+A non-realtime session ignores this problem and assumes the system is fast enough. If this is not the case, the results will fall behind, the internal buffer will get full, ErrorCantKeepUp result will be called, and the results will be disastrously horrible.
Handler
+The results are given via a callback (handler). It gets called by the session whenever it has new results. The parameters given to the callback include the result type and the token array.
+Note that in an asynchronous session, the handler will be called from a different thread. Be sure to expect this and write thread-safe code, or use a synchronous session.
+You should try to make your handler function fast to avoid slowing down the session.
+The actual text can be extracted from the token array.
+Result Type
+The handler gets called with an enum explaining the result type:
+-
+
- Partial Recognition - the token array is a partial result and an updated array will be given in the next call +
- Final Recognition - the token array is final, the next call will start from an empty array +
- Error Can't Keep Up - called in an asynchronous non-realtime session if the system is not fast enough, may also be called briefly in an asynchronous realtime session, the token array is empty or null +
- Silence - there has been silence, the token array is empty or null +
Token
+A token may be a single letter, a word chunk, an entire word, punctuation, or other arbitrary set of characters.
+To convert a token array to a string, simply concatenate the strings from each token. You don't need to add spaces between tokens, the tokens contain their own formatting.
+
For example, the text "THAT'S COOL ELEPHANTS" may be represented as tokens like so:
-
+
[" THAT", "'", "S", " CO", "OL", " E", "LE", "P", "H", "ANT", "S"]
+- Simply concatenating these strings will give you the correct
" THAT'S COOL ELEPHANTS", but with an extra space at the beginning. You may want to strip the final string to avoid the extra space.
+
Tokens contain more data than just the string however. They also contain the log probability, and a boolean denoting whether or not it's a word boundary. In English, the word boundary value is equivalent to checking if the first character is a space.
+Dependencies
+AprilASR depends on ONNXRuntime for ML inference. You will need both libraries for it to work:
+-
+
- Linux:
libaprilasr.soandlibonnxruntime.so
+ - Windows:
libaprilasr.dllandonnxruntime.dll
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diff --git a/csharp/Doxyfile b/csharp/Doxyfile
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+# Doxyfile 1.9.1
+
+# This file describes the settings to be used by the documentation system
+# doxygen (www.doxygen.org) for a project.
+#
+# All text after a double hash (##) is considered a comment and is placed in
+# front of the TAG it is preceding.
+#
+# All text after a single hash (#) is considered a comment and will be ignored.
+# The format is:
+# TAG = value [value, ...]
+# For lists, items can also be appended using:
+# TAG += value [value, ...]
+# Values that contain spaces should be placed between quotes (\" \").
+
+#---------------------------------------------------------------------------
+# Project related configuration options
+#---------------------------------------------------------------------------
+
+# This tag specifies the encoding used for all characters in the configuration
+# file that follow. The default is UTF-8 which is also the encoding used for all
+# text before the first occurrence of this tag. Doxygen uses libiconv (or the
+# iconv built into libc) for the transcoding. See
+# https://www.gnu.org/software/libiconv/ for the list of possible encodings.
+# The default value is: UTF-8.
+
+DOXYFILE_ENCODING = UTF-8
+
+# The PROJECT_NAME tag is a single word (or a sequence of words surrounded by
+# double-quotes, unless you are using Doxywizard) that should identify the
+# project for which the documentation is generated. This name is used in the
+# title of most generated pages and in a few other places.
+# The default value is: My Project.
+
+PROJECT_NAME = AprilAsr
+
+# The PROJECT_NUMBER tag can be used to enter a project or revision number. This
+# could be handy for archiving the generated documentation or if some version
+# control system is used.
+
+PROJECT_NUMBER =
+
+# Using the PROJECT_BRIEF tag one can provide an optional one line description
+# for a project that appears at the top of each page and should give viewer a
+# quick idea about the purpose of the project. Keep the description short.
+
+PROJECT_BRIEF =
+
+# With the PROJECT_LOGO tag one can specify a logo or an icon that is included
+# in the documentation. The maximum height of the logo should not exceed 55
+# pixels and the maximum width should not exceed 200 pixels. Doxygen will copy
+# the logo to the output directory.
+
+PROJECT_LOGO =
+
+# The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path
+# into which the generated documentation will be written. If a relative path is
+# entered, it will be relative to the location where doxygen was started. If
+# left blank the current directory will be used.
+
+OUTPUT_DIRECTORY = .
+
+# If the CREATE_SUBDIRS tag is set to YES then doxygen will create 4096 sub-
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+# option can be useful when feeding doxygen a huge amount of source files, where
+# putting all generated files in the same directory would otherwise causes
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+# The default value is: NO.
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+CREATE_SUBDIRS = NO
+
+# If the ALLOW_UNICODE_NAMES tag is set to YES, doxygen will allow non-ASCII
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+# The default value is: NO.
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+ALLOW_UNICODE_NAMES = NO
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+# The OUTPUT_LANGUAGE tag is used to specify the language in which all
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+OUTPUT_LANGUAGE = English
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+# The OUTPUT_TEXT_DIRECTION tag is used to specify the direction in which all
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+# The default value is: None.
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+OUTPUT_TEXT_DIRECTION = None
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+# If the BRIEF_MEMBER_DESC tag is set to YES, doxygen will include brief member
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+BRIEF_MEMBER_DESC = YES
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+# If the REPEAT_BRIEF tag is set to YES, doxygen will prepend the brief
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+# This tag implements a quasi-intelligent brief description abbreviator that is
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+ALWAYS_DETAILED_SEC = NO
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+SHORT_NAMES = NO
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+JAVADOC_AUTOBRIEF = NO
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+# If the JAVADOC_BANNER tag is set to YES then doxygen will interpret a line
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+# The default value is: NO.
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+JAVADOC_BANNER = NO
+
+# If the QT_AUTOBRIEF tag is set to YES then doxygen will interpret the first
+# line (until the first dot) of a Qt-style comment as the brief description. If
+# set to NO, the Qt-style will behave just like regular Qt-style comments (thus
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+QT_AUTOBRIEF = NO
+
+# The MULTILINE_CPP_IS_BRIEF tag can be set to YES to make doxygen treat a
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+# tag to YES if you prefer the old behavior instead.
+#
+# Note that setting this tag to YES also means that rational rose comments are
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+MULTILINE_CPP_IS_BRIEF = NO
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+# By default Python docstrings are displayed as preformatted text and doxygen's
+# special commands cannot be used. By setting PYTHON_DOCSTRING to NO the
+# doxygen's special commands can be used and the contents of the docstring
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+# The default value is: YES.
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+PYTHON_DOCSTRING = YES
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+# The TAB_SIZE tag can be used to set the number of spaces in a tab. Doxygen
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+# sources. Doxygen will then generate output that is tailored for VHDL.
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+INLINE_SIMPLE_STRUCTS = NO
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+
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+# Minimum value: 0, maximum value: 9, default value: 0.
+
+LOOKUP_CACHE_SIZE = 0
+
+# The NUM_PROC_THREADS specifies the number threads doxygen is allowed to use
+# during processing. When set to 0 doxygen will based this on the number of
+# cores available in the system. You can set it explicitly to a value larger
+# than 0 to get more control over the balance between CPU load and processing
+# speed. At this moment only the input processing can be done using multiple
+# threads. Since this is still an experimental feature the default is set to 1,
+# which efficively disables parallel processing. Please report any issues you
+# encounter. Generating dot graphs in parallel is controlled by the
+# DOT_NUM_THREADS setting.
+# Minimum value: 0, maximum value: 32, default value: 1.
+
+NUM_PROC_THREADS = 1
+
+#---------------------------------------------------------------------------
+# Build related configuration options
+#---------------------------------------------------------------------------
+
+# If the EXTRACT_ALL tag is set to YES, doxygen will assume all entities in
+# documentation are documented, even if no documentation was available. Private
+# class members and static file members will be hidden unless the
+# EXTRACT_PRIVATE respectively EXTRACT_STATIC tags are set to YES.
+# Note: This will also disable the warnings about undocumented members that are
+# normally produced when WARNINGS is set to YES.
+# The default value is: NO.
+
+EXTRACT_ALL = NO
+
+# If the EXTRACT_PRIVATE tag is set to YES, all private members of a class will
+# be included in the documentation.
+# The default value is: NO.
+
+EXTRACT_PRIVATE = NO
+
+# If the EXTRACT_PRIV_VIRTUAL tag is set to YES, documented private virtual
+# methods of a class will be included in the documentation.
+# The default value is: NO.
+
+EXTRACT_PRIV_VIRTUAL = NO
+
+# If the EXTRACT_PACKAGE tag is set to YES, all members with package or internal
+# scope will be included in the documentation.
+# The default value is: NO.
+
+EXTRACT_PACKAGE = NO
+
+# If the EXTRACT_STATIC tag is set to YES, all static members of a file will be
+# included in the documentation.
+# The default value is: NO.
+
+EXTRACT_STATIC = NO
+
+# If the EXTRACT_LOCAL_CLASSES tag is set to YES, classes (and structs) defined
+# locally in source files will be included in the documentation. If set to NO,
+# only classes defined in header files are included. Does not have any effect
+# for Java sources.
+# The default value is: YES.
+
+EXTRACT_LOCAL_CLASSES = YES
+
+# This flag is only useful for Objective-C code. If set to YES, local methods,
+# which are defined in the implementation section but not in the interface are
+# included in the documentation. If set to NO, only methods in the interface are
+# included.
+# The default value is: NO.
+
+EXTRACT_LOCAL_METHODS = NO
+
+# If this flag is set to YES, the members of anonymous namespaces will be
+# extracted and appear in the documentation as a namespace called
+# 'anonymous_namespace{file}', where file will be replaced with the base name of
+# the file that contains the anonymous namespace. By default anonymous namespace
+# are hidden.
+# The default value is: NO.
+
+EXTRACT_ANON_NSPACES = NO
+
+# If this flag is set to YES, the name of an unnamed parameter in a declaration
+# will be determined by the corresponding definition. By default unnamed
+# parameters remain unnamed in the output.
+# The default value is: YES.
+
+RESOLVE_UNNAMED_PARAMS = YES
+
+# If the HIDE_UNDOC_MEMBERS tag is set to YES, doxygen will hide all
+# undocumented members inside documented classes or files. If set to NO these
+# members will be included in the various overviews, but no documentation
+# section is generated. This option has no effect if EXTRACT_ALL is enabled.
+# The default value is: NO.
+
+HIDE_UNDOC_MEMBERS = NO
+
+# If the HIDE_UNDOC_CLASSES tag is set to YES, doxygen will hide all
+# undocumented classes that are normally visible in the class hierarchy. If set
+# to NO, these classes will be included in the various overviews. This option
+# has no effect if EXTRACT_ALL is enabled.
+# The default value is: NO.
+
+HIDE_UNDOC_CLASSES = NO
+
+# If the HIDE_FRIEND_COMPOUNDS tag is set to YES, doxygen will hide all friend
+# declarations. If set to NO, these declarations will be included in the
+# documentation.
+# The default value is: NO.
+
+HIDE_FRIEND_COMPOUNDS = NO
+
+# If the HIDE_IN_BODY_DOCS tag is set to YES, doxygen will hide any
+# documentation blocks found inside the body of a function. If set to NO, these
+# blocks will be appended to the function's detailed documentation block.
+# The default value is: NO.
+
+HIDE_IN_BODY_DOCS = NO
+
+# The INTERNAL_DOCS tag determines if documentation that is typed after a
+# \internal command is included. If the tag is set to NO then the documentation
+# will be excluded. Set it to YES to include the internal documentation.
+# The default value is: NO.
+
+INTERNAL_DOCS = NO
+
+# With the correct setting of option CASE_SENSE_NAMES doxygen will better be
+# able to match the capabilities of the underlying filesystem. In case the
+# filesystem is case sensitive (i.e. it supports files in the same directory
+# whose names only differ in casing), the option must be set to YES to properly
+# deal with such files in case they appear in the input. For filesystems that
+# are not case sensitive the option should be be set to NO to properly deal with
+# output files written for symbols that only differ in casing, such as for two
+# classes, one named CLASS and the other named Class, and to also support
+# references to files without having to specify the exact matching casing. On
+# Windows (including Cygwin) and MacOS, users should typically set this option
+# to NO, whereas on Linux or other Unix flavors it should typically be set to
+# YES.
+# The default value is: system dependent.
+
+CASE_SENSE_NAMES = NO
+
+# If the HIDE_SCOPE_NAMES tag is set to NO then doxygen will show members with
+# their full class and namespace scopes in the documentation. If set to YES, the
+# scope will be hidden.
+# The default value is: NO.
+
+HIDE_SCOPE_NAMES = NO
+
+# If the HIDE_COMPOUND_REFERENCE tag is set to NO (default) then doxygen will
+# append additional text to a page's title, such as Class Reference. If set to
+# YES the compound reference will be hidden.
+# The default value is: NO.
+
+HIDE_COMPOUND_REFERENCE= NO
+
+# If the SHOW_INCLUDE_FILES tag is set to YES then doxygen will put a list of
+# the files that are included by a file in the documentation of that file.
+# The default value is: YES.
+
+SHOW_INCLUDE_FILES = YES
+
+# If the SHOW_GROUPED_MEMB_INC tag is set to YES then Doxygen will add for each
+# grouped member an include statement to the documentation, telling the reader
+# which file to include in order to use the member.
+# The default value is: NO.
+
+SHOW_GROUPED_MEMB_INC = NO
+
+# If the FORCE_LOCAL_INCLUDES tag is set to YES then doxygen will list include
+# files with double quotes in the documentation rather than with sharp brackets.
+# The default value is: NO.
+
+FORCE_LOCAL_INCLUDES = NO
+
+# If the INLINE_INFO tag is set to YES then a tag [inline] is inserted in the
+# documentation for inline members.
+# The default value is: YES.
+
+INLINE_INFO = YES
+
+# If the SORT_MEMBER_DOCS tag is set to YES then doxygen will sort the
+# (detailed) documentation of file and class members alphabetically by member
+# name. If set to NO, the members will appear in declaration order.
+# The default value is: YES.
+
+SORT_MEMBER_DOCS = YES
+
+# If the SORT_BRIEF_DOCS tag is set to YES then doxygen will sort the brief
+# descriptions of file, namespace and class members alphabetically by member
+# name. If set to NO, the members will appear in declaration order. Note that
+# this will also influence the order of the classes in the class list.
+# The default value is: NO.
+
+SORT_BRIEF_DOCS = NO
+
+# If the SORT_MEMBERS_CTORS_1ST tag is set to YES then doxygen will sort the
+# (brief and detailed) documentation of class members so that constructors and
+# destructors are listed first. If set to NO the constructors will appear in the
+# respective orders defined by SORT_BRIEF_DOCS and SORT_MEMBER_DOCS.
+# Note: If SORT_BRIEF_DOCS is set to NO this option is ignored for sorting brief
+# member documentation.
+# Note: If SORT_MEMBER_DOCS is set to NO this option is ignored for sorting
+# detailed member documentation.
+# The default value is: NO.
+
+SORT_MEMBERS_CTORS_1ST = NO
+
+# If the SORT_GROUP_NAMES tag is set to YES then doxygen will sort the hierarchy
+# of group names into alphabetical order. If set to NO the group names will
+# appear in their defined order.
+# The default value is: NO.
+
+SORT_GROUP_NAMES = NO
+
+# If the SORT_BY_SCOPE_NAME tag is set to YES, the class list will be sorted by
+# fully-qualified names, including namespaces. If set to NO, the class list will
+# be sorted only by class name, not including the namespace part.
+# Note: This option is not very useful if HIDE_SCOPE_NAMES is set to YES.
+# Note: This option applies only to the class list, not to the alphabetical
+# list.
+# The default value is: NO.
+
+SORT_BY_SCOPE_NAME = NO
+
+# If the STRICT_PROTO_MATCHING option is enabled and doxygen fails to do proper
+# type resolution of all parameters of a function it will reject a match between
+# the prototype and the implementation of a member function even if there is
+# only one candidate or it is obvious which candidate to choose by doing a
+# simple string match. By disabling STRICT_PROTO_MATCHING doxygen will still
+# accept a match between prototype and implementation in such cases.
+# The default value is: NO.
+
+STRICT_PROTO_MATCHING = NO
+
+# The GENERATE_TODOLIST tag can be used to enable (YES) or disable (NO) the todo
+# list. This list is created by putting \todo commands in the documentation.
+# The default value is: YES.
+
+GENERATE_TODOLIST = YES
+
+# The GENERATE_TESTLIST tag can be used to enable (YES) or disable (NO) the test
+# list. This list is created by putting \test commands in the documentation.
+# The default value is: YES.
+
+GENERATE_TESTLIST = YES
+
+# The GENERATE_BUGLIST tag can be used to enable (YES) or disable (NO) the bug
+# list. This list is created by putting \bug commands in the documentation.
+# The default value is: YES.
+
+GENERATE_BUGLIST = YES
+
+# The GENERATE_DEPRECATEDLIST tag can be used to enable (YES) or disable (NO)
+# the deprecated list. This list is created by putting \deprecated commands in
+# the documentation.
+# The default value is: YES.
+
+GENERATE_DEPRECATEDLIST= YES
+
+# The ENABLED_SECTIONS tag can be used to enable conditional documentation
+# sections, marked by \if
+
+
+
+
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+
+ C#
+Installation
+Install the nuget package from https://www.nuget.org/packages/AprilAsr
+Getting Started
+To get started, import AprilAsr
+using AprilAsr;
+Model
+You can load a model like so:
+string modelPath = "/path/to/model.april";
+AprilModel model = new AprilModel(modelPath);
+Models have a few metadata fields:
+string name = model.Name;
+string description = model.Description;
+string language = model.Language;
+int sampleRate = model.SampleRate;
+Session
+A session needs a callback. You can define one inline, this example concatenates the tokens to a string and prints it.
+AprilSession session = new AprilSession(model, (result, tokens) => {
+ if (tokens == null) return;
+
+ string s = "";
+ if(result == AprilResultKind.PartialRecognition) {
+ s = "- ";
+ }else if(result == AprilResultKind.FinalRecognition) {
+ s = "@ ";
+ }else{
+ s = " ";
+ }
+
+ foreach(AprilToken token in tokens) {
+ s += token.Token;
+ }
+
+ Console.WriteLine(s);
+});
+Session Options
+There are more options when it comes to creating a session, here is the initializer signature:
+public AprilSession(AprilModel model, SessionCallback callback, bool async = false, bool noRT = false, string speakerName = "") {
+Refer to the General Concepts page for an explanation on asynchronous, non-realtime, and speaker name options
+Feed data
+Most of the examples use a very simple method like this to load and feed audio:
+// Read the file data (assumes wav file is 16-bit PCM wav)
+var fileData = File.ReadAllBytes(wavFilePath);
+short[] shorts = new short[fileData.Length / 2];
+Buffer.BlockCopy(fileData, 0, shorts, 0, fileData.Length);
+
+// Feed the data
+session.FeedPCM16(shorts, shorts.Length);
+This works only if the wav file is PCM16 and sampled in the correct sample rate. When you attempt to load an mp3, non-PCM16/non-16kHz wav file, or any other audio file in this way, you will likely get gibberish or no results.
+ +Asynchronous
+Asynchronous sessions are a little more complicated. You can create one by setting the asynchronous flag to true:
+AprilSession session = new AprilSession(..., async: true);
+Now, when feeding audio, be sure to feed it in realtime.
+var fileData = File.ReadAllBytes(wavFilePath);
+short[] shorts = new short[2400];
+
+for(int i=0; i<(fileData.Length/2); i+=shorts.Length){
+ int size = Math.Min(shorts.Length, (fileData.Length/2) - i);
+ Buffer.BlockCopy(fileData, i*2, shorts, 0, size*2);
+ session.FeedPCM16(shorts, size);
+ Thread.Sleep(size * 1000 / model.SampleRate);
+}
+
+session.Flush();
+Complete example
+using AprilAsr;
+
+var modelPath = "aprilv0_en-us.april";
+var wavFilePath = "audio.wav";
+
+// Load the model and print metadata
+var model = new AprilModel(modelPath);
+Console.WriteLine("Name: " + model.Name);
+Console.WriteLine("Description: " + model.Description);
+Console.WriteLine("Language: " + model.Language);
+
+// Create the session with an inline callback
+var session = new AprilSession(model, (result, tokens) => {
+ string s = "";
+ if(result == AprilResultKind.PartialRecognition) {
+ s = "- ";
+ }else if(result == AprilResultKind.FinalRecognition) {
+ s = "@ ";
+ }else{
+ s = " ";
+ }
+
+ foreach(AprilToken token in tokens) {
+ s += token.Token;
+ }
+
+ Console.WriteLine(s);
+});
+
+// Read the file data (assumes wav file is 16-bit PCM wav)
+var fileData = File.ReadAllBytes(wavFilePath);
+short[] shorts = new short[fileData.Length / 2];
+Buffer.BlockCopy(fileData, 0, shorts, 0, fileData.Length);
+
+// Feed the data and flush
+session.FeedPCM16(shorts, shorts.Length);
+session.Flush();
+Congratulations! You have just performed speech recognition using AprilAsr!
+ +