Here’s some scaffolding we’ll work under: Here’s an example (from the end of an old Mama Singh voicemail):Īpple’s Speech framework reports back transcription segments as an array of SFTranscriptionSegments - we’ll get to requesting those in a bit, but let’s start with the assumption that we have a collection of them in hand and want to write a function from () -> String, where the retuned string is SRT-formatted. (Repeating the above for as many groups as needed.).A blank line, indicating the end of the subtitle group.The subtitle text on one or more lines.Timecodes are formatted in hours:minutes:seconds,milliseconds with two zero-padded digits for the hours, minutes, and seconds and three for the milliseconds component (i.e.On the next line, the timecode that the subtitle should appear, followed by a -> separator, and the timecode for disappearance.Subtitle groups are sequentially numbered from 1.Thankfully, SubRip Text files are relatively straightforward to generate, and in turn, parse. srt files that are attached to videos through either Media Studio,, or via the API. Subtitles, as we’re defining them, are transcripts of a video’s dialogue or audio contained in. SRT filesĪ decent chuck of RIFFs are cross-posted to Twitter and the service’s captions file format of choice is SubRip Text (. While RIFF wasn’t quite ready for App Store prime time while I worked on it, it was our responsibility as a primarily audio-based app to make sure the eventual launch was accessible for the Deaf and Hard of Hearing community 1.Īnd in hopes of making captions generation more widely practiced, I wanted to write through an approach - but first, some context on the status quo of captions files. Whether to support floating point processing AVLinearPCMIsNonInterleavedĬrossed audio file type key After 11.0 AVAudioFileTypeKeyĪudioFile.(Assumed audience: folks familiar with Combine and optionally, Point-Free’s swift-composable-architecture and -parsing packages.) The values are: 8, 16, 24, 32 AVLinearPCMIsBigEndianKey Sampling depth, affecting sound quality, such as from cafturn mp3If set to 8The sound may be distorted and needs to be set a bit higher (eg 16) The number of channels used is generally: 8,000 Hz: The sampling rate used by the phone is enough for people to speak.mp3Format, will report an error AVSampleRateKey kAudioFormatMPEG4AAC: aacFile format audioįile format is not directly.kAudioFormatLinearPCM: Original audio file ( caf).KAudioFormatParameterValueStream = 'apvs', Recorded file format CF_ENUM(AudioFormatID) If (volumError) "Volume control failed volumError) overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:&volumError] Note that for the recording volume is relatively small, you need to add the following code // volume control, otherwise the sound is very small NSError *volumError = nil settings: Recording configuration information, the values are as follows:.UrlGeneral use Initialize, use URLWithString:Method initialization will fail to initialize the reason is URLFormat, need scheme, fileURLWithPathWill add file://,but URLWithStringWill not do anything url: The location where the recording file is saved is generally saved to the sandbox.url of the recording file readonly) NSURL *url /* URL of the recorded file */ // Recording file setting information /* these settings are fully valid only when prepareToRecord has been called */ readonly) NSDictionary *settings (nullable instancetype)initWithURL:( NSURL *)url settings:( NSDictionary *)settings error:( NSError **)outError Will overwrite a file at the specified url if a file exists. If not set, it will be inferred from the file extension. Recording AVAudioRecorder Initialization method /* The file type to create can be set through the corresponding settings key.
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