whisper.cpp/examples/whisper.swiftui/whisper.cpp.swift/LibWhisper.swift

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import Foundation
import whisper
enum WhisperError: Error {
case couldNotInitializeContext
}
// Meet Whisper C++ constraint: Don't access from more than one thread at a time.
actor WhisperContext {
private var context: OpaquePointer
init(context: OpaquePointer) {
self.context = context
}
deinit {
whisper_free(context)
}
func fullTranscribe(samples: [Float]) {
// Leave 2 processors free (i.e. the high-efficiency cores).
let maxThreads = max(1, min(8, cpuCount() - 2))
print("Selecting \(maxThreads) threads")
var params = whisper_full_default_params(WHISPER_SAMPLING_GREEDY)
"en".withCString { en in
// Adapted from whisper.objc
params.print_realtime = true
params.print_progress = false
params.print_timestamps = true
params.print_special = false
params.translate = false
params.language = en
params.n_threads = Int32(maxThreads)
params.offset_ms = 0
params.no_context = true
params.single_segment = false
whisper_reset_timings(context)
print("About to run whisper_full")
samples.withUnsafeBufferPointer { samples in
if (whisper_full(context, params, samples.baseAddress, Int32(samples.count)) != 0) {
print("Failed to run the model")
} else {
whisper_print_timings(context)
}
}
}
}
func getTranscription() -> String {
var transcription = ""
for i in 0..<whisper_full_n_segments(context) {
transcription += String.init(cString: whisper_full_get_segment_text(context, i))
}
return transcription
}
static func createContext(path: String) throws -> WhisperContext {
var params = whisper_context_default_params()
#if targetEnvironment(simulator)
params.use_gpu = false
print("Running on the simulator, using CPU")
#endif
let context = whisper_init_from_file_with_params(path, params)
if let context {
return WhisperContext(context: context)
} else {
print("Couldn't load model at \(path)")
throw WhisperError.couldNotInitializeContext
}
}
}
fileprivate func cpuCount() -> Int {
ProcessInfo.processInfo.processorCount
}