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Revise SDL 0303 - SDL Audio I/O Manager #1165

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Revise SDL 0303 - SDL Audio I/O Manager #1165

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cdf1e0d
Adding diagrams for state machine. Fixing state errors in implementat…
kshala-ford Nov 10, 2020
6239842
Updated diagram
kshala-ford Jan 18, 2021
f550a58
Finalized proposal revisions.
kshala-ford Jan 21, 2021
3a2b9fb
Fixing a typo in the input stream activity diagram.
kshala-ford Jul 22, 2021
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24 changes: 13 additions & 11 deletions assets/proposals/0303-audio-io-manager/SDLAudioIOManager.m
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,8 @@ typedef NS_ENUM(NSInteger, SDLAudioIOManagerState) {
SDLAudioIOManagerStateStarted = 2,
SDLAudioIOManagerStateStopping = 3, // only for input stream. When waiting for the APT response.
SDLAudioIOManagerStatePausing = 4, // only for input stream. It'll be paused when active and output stream starts
SDLAudioIOManagerStatePaused = 5, // only for input stream while output stream is playing
SDLAudioIOManagerStatePaused = 5, // only for inputstream while output stream is playing
SDLAudioIOManagerStateAborting = 6, // only for inputstream
};

@interface SDLAudioIOManager ()
Expand Down Expand Up @@ -80,7 +81,7 @@ - (instancetype)initWithManager:(SDLManager *)sdlManager delegate:(id<SDLAudioIO
self.operationQueue.suspended = YES;

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onTransportDisconnect) name:SDLTransportDidDisconnect object:nil];

return self;
}

Expand Down Expand Up @@ -174,7 +175,10 @@ - (void)sdl_writeOutputStreamWithFileURL:(NSURL *)fileURL {
}

// in case the input stream is stopping or pausing we will return here and wait until it's fully paused or stopped (there we will start the stream)
if (self.inputStreamState == SDLAudioIOManagerStateStopping || self.inputStreamState == SDLAudioIOManagerStatePausing) {
switch (self.inputStreamState) {
case SDLAudioIOManagerStateStopping:
case SDLAudioIOManagerStatePausing:
case SDLAudioIOManagerStateAborting:
SDLLogV(@"Input stream state is %@. Waiting for input stream transition to be completed.", [self nameForStreamState:self.inputStreamState]);
return;
}
Expand Down Expand Up @@ -586,8 +590,8 @@ - (void)sdl_pauseInputStream {
// if input stream is started or starting we have to send a request to stop it but the status will be pausing (or paused later on)
SDLLogV(@"Input stream state is started. Change state to pausing and send request to end audio input");
self.inputStreamState = SDLAudioIOManagerStatePausing;
[self.sdlManager sendRequest:[[SDLEndAudioPassThru alloc] init]];
[self sdl_initiateAbortInputStreamTimer];
[self.sdlManager sendRequest:[[SDLEndAudioPassThru alloc] init]];
break;
}
default: {
Expand All @@ -606,8 +610,8 @@ - (void)sdl_stopInputStream {
case SDLAudioIOManagerStateStarted: {
SDLLogV(@"Stopping input stream. Sending request to end audio input");
self.inputStreamState = SDLAudioIOManagerStateStopping;
[self.sdlManager sendRequest:[[SDLEndAudioPassThru alloc] init]];
[self sdl_initiateAbortInputStreamTimer];
[self.sdlManager sendRequest:[[SDLEndAudioPassThru alloc] init]];
break;
}
default: {
Expand All @@ -630,9 +634,9 @@ - (BOOL)sdl_abortInputStream {
SDLLogV(@"Attempt to abort input stream from %@", [self nameForStreamState:self.inputStreamState]);

switch (self.inputStreamState) {
case SDLAudioIOManagerStateStarted:
case SDLAudioIOManagerStatePaused:
case SDLAudioIOManagerStateStopped:
SDLLogW(@"Input stream abort not possible when Started or Stopped. Current state %@", [self nameForStreamState:self.inputStreamState]);
SDLLogW(@"Input stream abort not possible when Paused or Stopped. Current state %@", [self nameForStreamState:self.inputStreamState]);
return NO;
}

Expand All @@ -641,10 +645,8 @@ - (BOOL)sdl_abortInputStream {
return NO;
}

// Aborting from Pausing to Paused or Stopping to Stopped is already regular workflow. We need to enforce stopping when we tried to start.
if (self.inputStreamState == SDLAudioIOManagerStateStarting) {
self.inputStreamState = SDLAudioIOManagerStateStopping;
}
// enforce stopping state from any other state (starting, started, pausing, stopping)
self.inputStreamState = SDLAudioIOManagerStateAborting;

SDLPerformAudioPassThruResponse *response = [[SDLPerformAudioPassThruResponse alloc] init];
response.correlationID = self.inputStreamOperation.requests[0].correlationID;
Expand Down
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1 change: 1 addition & 0 deletions assets/proposals/0303-audio-io-manager/state-machine.drawio
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@@ -0,0 +1 @@
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id="xoF9nnG_oweU8Ng00VRA" name="Output Stream">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</diagram></mxfile>
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