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AudioStreamer.m
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//
// AudioStreamer.m
// StreamingAudioPlayer
//
// Created by Matt Gallagher on 27/09/08.
// Copyright 2008 Matt Gallagher. All rights reserved.
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software. Permission is granted to anyone to
// use this software for any purpose, including commercial applications, and to
// alter it and redistribute it freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source
// distribution.
//
#import "AudioStreamer.h"
#if TARGET_OS_IPHONE
#import <CFNetwork/CFNetwork.h>
#endif
#define BitRateEstimationMaxPackets 5000
#define BitRateEstimationMinPackets 50
NSString * const ASStatusChangedNotification = @"ASStatusChangedNotification";
NSString * const AS_NO_ERROR_STRING = @"No error.";
NSString * const AS_FILE_STREAM_GET_PROPERTY_FAILED_STRING = @"File stream get property failed.";
NSString * const AS_FILE_STREAM_SEEK_FAILED_STRING = @"File stream seek failed.";
NSString * const AS_FILE_STREAM_PARSE_BYTES_FAILED_STRING = @"Parse bytes failed.";
NSString * const AS_FILE_STREAM_OPEN_FAILED_STRING = @"Open audio file stream failed.";
NSString * const AS_FILE_STREAM_CLOSE_FAILED_STRING = @"Close audio file stream failed.";
NSString * const AS_AUDIO_QUEUE_CREATION_FAILED_STRING = @"Audio queue creation failed.";
NSString * const AS_AUDIO_QUEUE_BUFFER_ALLOCATION_FAILED_STRING = @"Audio buffer allocation failed.";
NSString * const AS_AUDIO_QUEUE_ENQUEUE_FAILED_STRING = @"Queueing of audio buffer failed.";
NSString * const AS_AUDIO_QUEUE_ADD_LISTENER_FAILED_STRING = @"Audio queue add listener failed.";
NSString * const AS_AUDIO_QUEUE_REMOVE_LISTENER_FAILED_STRING = @"Audio queue remove listener failed.";
NSString * const AS_AUDIO_QUEUE_START_FAILED_STRING = @"Audio queue start failed.";
NSString * const AS_AUDIO_QUEUE_BUFFER_MISMATCH_STRING = @"Audio queue buffers don't match.";
NSString * const AS_AUDIO_QUEUE_DISPOSE_FAILED_STRING = @"Audio queue dispose failed.";
NSString * const AS_AUDIO_QUEUE_PAUSE_FAILED_STRING = @"Audio queue pause failed.";
NSString * const AS_AUDIO_QUEUE_STOP_FAILED_STRING = @"Audio queue stop failed.";
NSString * const AS_AUDIO_DATA_NOT_FOUND_STRING = @"No audio data found.";
NSString * const AS_AUDIO_QUEUE_FLUSH_FAILED_STRING = @"Audio queue flush failed.";
NSString * const AS_GET_AUDIO_TIME_FAILED_STRING = @"Audio queue get current time failed.";
NSString * const AS_AUDIO_STREAMER_FAILED_STRING = @"Audio playback failed";
NSString * const AS_NETWORK_CONNECTION_FAILED_STRING = @"Network connection failed";
NSString * const AS_AUDIO_BUFFER_TOO_SMALL_STRING = @"Audio packets are larger than kAQDefaultBufSize.";
@interface AudioStreamer ()
@property (readwrite) AudioStreamerState state;
- (void)handlePropertyChangeForFileStream:(AudioFileStreamID)inAudioFileStream
fileStreamPropertyID:(AudioFileStreamPropertyID)inPropertyID
ioFlags:(UInt32 *)ioFlags;
- (void)handleAudioPackets:(const void *)inInputData
numberBytes:(UInt32)inNumberBytes
numberPackets:(UInt32)inNumberPackets
packetDescriptions:(AudioStreamPacketDescription *)inPacketDescriptions;
- (void)handleBufferCompleteForQueue:(AudioQueueRef)inAQ
buffer:(AudioQueueBufferRef)inBuffer;
- (void)handlePropertyChangeForQueue:(AudioQueueRef)inAQ
propertyID:(AudioQueuePropertyID)inID;
#if TARGET_OS_IPHONE
- (void)handleInterruptionChangeToState:(AudioQueuePropertyID)inInterruptionState;
#endif
- (void)internalSeekToTime:(double)newSeekTime;
- (void)enqueueBuffer;
- (void)handleReadFromStream:(CFReadStreamRef)aStream
eventType:(CFStreamEventType)eventType;
@end
#pragma mark Audio Callback Function Implementations
//
// ASPropertyListenerProc
//
// Receives notification when the AudioFileStream has audio packets to be
// played. In response, this function creates the AudioQueue, getting it
// ready to begin playback (playback won't begin until audio packets are
// sent to the queue in ASEnqueueBuffer).
//
// This function is adapted from Apple's example in AudioFileStreamExample with
// kAudioQueueProperty_IsRunning listening added.
//
static void ASPropertyListenerProc(void * inClientData,
AudioFileStreamID inAudioFileStream,
AudioFileStreamPropertyID inPropertyID,
UInt32 * ioFlags)
{
// this is called by audio file stream when it finds property values
AudioStreamer* streamer = (__bridge AudioStreamer *)inClientData;
[streamer
handlePropertyChangeForFileStream:inAudioFileStream
fileStreamPropertyID:inPropertyID
ioFlags:ioFlags];
}
//
// ASPacketsProc
//
// When the AudioStream has packets to be played, this function gets an
// idle audio buffer and copies the audio packets into it. The calls to
// ASEnqueueBuffer won't return until there are buffers available (or the
// playback has been stopped).
//
// This function is adapted from Apple's example in AudioFileStreamExample with
// CBR functionality added.
//
static void ASPacketsProc( void * inClientData,
UInt32 inNumberBytes,
UInt32 inNumberPackets,
const void * inInputData,
AudioStreamPacketDescription *inPacketDescriptions)
{
// this is called by audio file stream when it finds packets of audio
AudioStreamer* streamer = (__bridge AudioStreamer *)inClientData;
[streamer
handleAudioPackets:inInputData
numberBytes:inNumberBytes
numberPackets:inNumberPackets
packetDescriptions:inPacketDescriptions];
}
//
// ASAudioQueueOutputCallback
//
// Called from the AudioQueue when playback of specific buffers completes. This
// function signals from the AudioQueue thread to the AudioStream thread that
// the buffer is idle and available for copying data.
//
// This function is unchanged from Apple's example in AudioFileStreamExample.
//
static void ASAudioQueueOutputCallback(void* inClientData,
AudioQueueRef inAQ,
AudioQueueBufferRef inBuffer)
{
// this is called by the audio queue when it has finished decoding our data.
// The buffer is now free to be reused.
AudioStreamer* streamer = (__bridge AudioStreamer*)inClientData;
[streamer handleBufferCompleteForQueue:inAQ buffer:inBuffer];
}
//
// ASAudioQueueIsRunningCallback
//
// Called from the AudioQueue when playback is started or stopped. This
// information is used to toggle the observable "isPlaying" property and
// set the "finished" flag.
//
static void ASAudioQueueIsRunningCallback(void *inUserData, AudioQueueRef inAQ, AudioQueuePropertyID inID)
{
AudioStreamer* streamer = (__bridge AudioStreamer *)inUserData;
[streamer handlePropertyChangeForQueue:inAQ propertyID:inID];
}
#if TARGET_OS_IPHONE
//
// ASAudioSessionInterruptionListener
//
// Invoked if the audio session is interrupted (like when the phone rings)
//
static void ASAudioSessionInterruptionListener(void *inClientData, UInt32 inInterruptionState)
{
AudioStreamer* streamer = (__bridge AudioStreamer *)inClientData;
[streamer handleInterruptionChangeToState:inInterruptionState];
}
#endif
#pragma mark CFReadStream Callback Function Implementations
//
// ReadStreamCallBack
//
// This is the callback for the CFReadStream from the network connection. This
// is where all network data is passed to the AudioFileStream.
//
// Invoked when an error occurs, the stream ends or we have data to read.
//
static void ASReadStreamCallBack
(
CFReadStreamRef aStream,
CFStreamEventType eventType,
void* inClientInfo
)
{
AudioStreamer* streamer = (__bridge AudioStreamer *)inClientInfo;
[streamer handleReadFromStream:aStream eventType:eventType];
}
@implementation AudioStreamer
@synthesize errorCode;
@synthesize state;
@synthesize bitRate;
@synthesize httpHeaders;
@synthesize fileExtension;
//
// initWithURL
//
// Init method for the object.
//
- (id)initWithURL:(NSURL *)aURL
{
self = [super init];
if (self != nil)
{
url = aURL;
}
return self;
}
//
// dealloc
//
// Releases instance memory.
//
- (void)dealloc
{
[self stop];
}
//
// isFinishing
//
// returns YES if the audio has reached a stopping condition.
//
- (BOOL)isFinishing
{
@synchronized (self)
{
if ((errorCode != AS_NO_ERROR && state != AS_INITIALIZED) ||
((state == AS_STOPPING || state == AS_STOPPED) &&
stopReason != AS_STOPPING_TEMPORARILY))
{
return YES;
}
}
return NO;
}
//
// runLoopShouldExit
//
// returns YES if the run loop should exit.
//
- (BOOL)runLoopShouldExit
{
@synchronized(self)
{
if (errorCode != AS_NO_ERROR ||
(state == AS_STOPPED &&
stopReason != AS_STOPPING_TEMPORARILY))
{
return YES;
}
}
return NO;
}
//
// stringForErrorCode:
//
// Converts an error code to a string that can be localized or presented
// to the user.
//
// Parameters:
// anErrorCode - the error code to convert
//
// returns the string representation of the error code
//
+ (NSString *)stringForErrorCode:(AudioStreamerErrorCode)anErrorCode
{
switch (anErrorCode)
{
case AS_NO_ERROR:
return AS_NO_ERROR_STRING;
case AS_FILE_STREAM_GET_PROPERTY_FAILED:
return AS_FILE_STREAM_GET_PROPERTY_FAILED_STRING;
case AS_FILE_STREAM_SEEK_FAILED:
return AS_FILE_STREAM_SEEK_FAILED_STRING;
case AS_FILE_STREAM_PARSE_BYTES_FAILED:
return AS_FILE_STREAM_PARSE_BYTES_FAILED_STRING;
case AS_AUDIO_QUEUE_CREATION_FAILED:
return AS_AUDIO_QUEUE_CREATION_FAILED_STRING;
case AS_AUDIO_QUEUE_BUFFER_ALLOCATION_FAILED:
return AS_AUDIO_QUEUE_BUFFER_ALLOCATION_FAILED_STRING;
case AS_AUDIO_QUEUE_ENQUEUE_FAILED:
return AS_AUDIO_QUEUE_ENQUEUE_FAILED_STRING;
case AS_AUDIO_QUEUE_ADD_LISTENER_FAILED:
return AS_AUDIO_QUEUE_ADD_LISTENER_FAILED_STRING;
case AS_AUDIO_QUEUE_REMOVE_LISTENER_FAILED:
return AS_AUDIO_QUEUE_REMOVE_LISTENER_FAILED_STRING;
case AS_AUDIO_QUEUE_START_FAILED:
return AS_AUDIO_QUEUE_START_FAILED_STRING;
case AS_AUDIO_QUEUE_BUFFER_MISMATCH:
return AS_AUDIO_QUEUE_BUFFER_MISMATCH_STRING;
case AS_FILE_STREAM_OPEN_FAILED:
return AS_FILE_STREAM_OPEN_FAILED_STRING;
case AS_FILE_STREAM_CLOSE_FAILED:
return AS_FILE_STREAM_CLOSE_FAILED_STRING;
case AS_AUDIO_QUEUE_DISPOSE_FAILED:
return AS_AUDIO_QUEUE_DISPOSE_FAILED_STRING;
case AS_AUDIO_QUEUE_PAUSE_FAILED:
return AS_AUDIO_QUEUE_DISPOSE_FAILED_STRING;
case AS_AUDIO_QUEUE_FLUSH_FAILED:
return AS_AUDIO_QUEUE_FLUSH_FAILED_STRING;
case AS_AUDIO_DATA_NOT_FOUND:
return AS_AUDIO_DATA_NOT_FOUND_STRING;
case AS_GET_AUDIO_TIME_FAILED:
return AS_GET_AUDIO_TIME_FAILED_STRING;
case AS_NETWORK_CONNECTION_FAILED:
return AS_NETWORK_CONNECTION_FAILED_STRING;
case AS_AUDIO_QUEUE_STOP_FAILED:
return AS_AUDIO_QUEUE_STOP_FAILED_STRING;
case AS_AUDIO_STREAMER_FAILED:
return AS_AUDIO_STREAMER_FAILED_STRING;
case AS_AUDIO_BUFFER_TOO_SMALL:
return AS_AUDIO_BUFFER_TOO_SMALL_STRING;
default:
return AS_AUDIO_STREAMER_FAILED_STRING;
}
return AS_AUDIO_STREAMER_FAILED_STRING;
}
//
// presentAlertWithTitle:message:
//
// Common code for presenting error dialogs
//
// Parameters:
// title - title for the dialog
// message - main test for the dialog
//
- (void)presentAlertWithTitle:(NSString*)title message:(NSString*)message
{
#if TARGET_OS_IPHONE
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:title
message:message
delegate:self
cancelButtonTitle:NSLocalizedString(@"OK", @"")
otherButtonTitles: nil];
[alert
performSelector:@selector(show)
onThread:[NSThread mainThread]
withObject:nil
waitUntilDone:NO];
#else
NSAlert *alert =
[NSAlert
alertWithMessageText:title
defaultButton:NSLocalizedString(@"OK", @"")
alternateButton:nil
otherButton:nil
informativeTextWithFormat:message];
[alert
performSelector:@selector(runModal)
onThread:[NSThread mainThread]
withObject:nil
waitUntilDone:NO];
#endif
}
//
// failWithErrorCode:
//
// Sets the playback state to failed and logs the error.
//
// Parameters:
// anErrorCode - the error condition
//
- (void)failWithErrorCode:(AudioStreamerErrorCode)anErrorCode
{
@synchronized(self)
{
if (errorCode != AS_NO_ERROR)
{
// Only set the error once.
return;
}
errorCode = anErrorCode;
if (err)
{
char *errChars = (char *)&err;
NSLog(@"%@ err: %c%c%c%c %d\n",
[AudioStreamer stringForErrorCode:anErrorCode],
errChars[3], errChars[2], errChars[1], errChars[0],
(int)err);
}
else
{
NSLog(@"%@", [AudioStreamer stringForErrorCode:anErrorCode]);
}
if (state == AS_PLAYING ||
state == AS_PAUSED ||
state == AS_BUFFERING)
{
self.state = AS_STOPPING;
stopReason = AS_STOPPING_ERROR;
AudioQueueStop(audioQueue, true);
}
[self presentAlertWithTitle:NSLocalizedStringFromTable(@"File Error", @"Errors", nil)
message:NSLocalizedStringFromTable(@"Unable to configure network read stream.", @"Errors", nil)];
}
}
//
// mainThreadStateNotification
//
// Method invoked on main thread to send notifications to the main thread's
// notification center.
//
- (void)mainThreadStateNotification
{
NSNotification *notification =
[NSNotification
notificationWithName:ASStatusChangedNotification
object:self];
[[NSNotificationCenter defaultCenter]
postNotification:notification];
}
//
// state
//
// returns the state value.
//
- (AudioStreamerState)state
{
@synchronized(self)
{
return state;
}
}
//
// setState:
//
// Sets the state and sends a notification that the state has changed.
//
// This method
//
// Parameters:
// anErrorCode - the error condition
//
- (void)setState:(AudioStreamerState)aStatus
{
@synchronized(self)
{
if (state != aStatus)
{
state = aStatus;
if ([[NSThread currentThread] isEqual:[NSThread mainThread]])
{
[self mainThreadStateNotification];
}
else
{
[self
performSelectorOnMainThread:@selector(mainThreadStateNotification)
withObject:nil
waitUntilDone:NO];
}
}
}
}
//
// isPlaying
//
// returns YES if the audio currently playing.
//
- (BOOL)isPlaying
{
if (state == AS_PLAYING)
{
return YES;
}
return NO;
}
//
// isPaused
//
// returns YES if the audio currently playing.
//
- (BOOL)isPaused
{
if (state == AS_PAUSED)
{
return YES;
}
return NO;
}
//
// isWaiting
//
// returns YES if the AudioStreamer is waiting for a state transition of some
// kind.
//
- (BOOL)isWaiting
{
@synchronized(self)
{
if ([self isFinishing] ||
state == AS_STARTING_FILE_THREAD||
state == AS_WAITING_FOR_DATA ||
state == AS_WAITING_FOR_QUEUE_TO_START ||
state == AS_BUFFERING)
{
return YES;
}
}
return NO;
}
//
// isIdle
//
// returns YES if the AudioStream is in the AS_INITIALIZED state (i.e.
// isn't doing anything).
//
- (BOOL)isIdle
{
if (state == AS_INITIALIZED)
{
return YES;
}
return NO;
}
//
// hintForFileExtension:
//
// Generates a first guess for the file type based on the file's extension
//
// Parameters:
// fileExtension - the file extension
//
// returns a file type hint that can be passed to the AudioFileStream
//
+ (AudioFileTypeID)hintForFileExtension:(NSString *)fileExtension
{
AudioFileTypeID fileTypeHint = kAudioFileAAC_ADTSType;
if ([fileExtension isEqual:@"mp3"])
{
fileTypeHint = kAudioFileMP3Type;
}
else if ([fileExtension isEqual:@"wav"])
{
fileTypeHint = kAudioFileWAVEType;
}
else if ([fileExtension isEqual:@"aifc"])
{
fileTypeHint = kAudioFileAIFCType;
}
else if ([fileExtension isEqual:@"aiff"])
{
fileTypeHint = kAudioFileAIFFType;
}
else if ([fileExtension isEqual:@"m4a"])
{
fileTypeHint = kAudioFileM4AType;
}
else if ([fileExtension isEqual:@"mp4"])
{
fileTypeHint = kAudioFileMPEG4Type;
}
else if ([fileExtension isEqual:@"caf"])
{
fileTypeHint = kAudioFileCAFType;
}
else if ([fileExtension isEqual:@"aac"])
{
fileTypeHint = kAudioFileAAC_ADTSType;
}
return fileTypeHint;
}
//
// openReadStream
//
// Open the audioFileStream to parse data and the fileHandle as the data
// source.
//
- (BOOL)openReadStream
{
@synchronized(self)
{
NSAssert([[NSThread currentThread] isEqual:internalThread],
@"File stream download must be started on the internalThread");
NSAssert(stream == nil, @"Download stream already initialized");
//
// Create the HTTP GET request
//
CFHTTPMessageRef message= CFHTTPMessageCreateRequest(NULL, (CFStringRef)@"GET", (__bridge CFURLRef)url, kCFHTTPVersion1_1);
//
// If we are creating this request to seek to a location, set the
// requested byte range in the headers.
//
if (fileLength > 0 && seekByteOffset > 0)
{
CFHTTPMessageSetHeaderFieldValue(message, CFSTR("Range"),
(__bridge CFStringRef)[NSString stringWithFormat:@"bytes=%ld-%ld", seekByteOffset, fileLength]);
discontinuous = YES;
}
//
// Create the read stream that will receive data from the HTTP request
//
stream = CFReadStreamCreateForHTTPRequest(NULL, message);
CFRelease(message);
//
// Enable stream redirection
//
if (CFReadStreamSetProperty(
stream,
kCFStreamPropertyHTTPShouldAutoredirect,
kCFBooleanTrue) == false)
{
[self presentAlertWithTitle:NSLocalizedStringFromTable(@"File Error", @"Errors", nil)
message:NSLocalizedStringFromTable(@"Unable to configure network read stream.", @"Errors", nil)];
return NO;
}
//
// Handle proxies
//
CFDictionaryRef proxySettings = CFNetworkCopySystemProxySettings();
CFReadStreamSetProperty(stream, kCFStreamPropertyHTTPProxy, proxySettings);
CFRelease(proxySettings);
//
// Handle SSL connections
//
if( [[url absoluteString] rangeOfString:@"https"].location != NSNotFound )
{
NSDictionary *sslSettings =
@{(id)kCFStreamSSLLevel: (NSString *)kCFStreamSocketSecurityLevelNegotiatedSSL,
(id)kCFStreamSSLAllowsExpiredCertificates: @YES,
(id)kCFStreamSSLAllowsExpiredRoots: @YES,
(id)kCFStreamSSLAllowsAnyRoot: @YES,
(id)kCFStreamSSLValidatesCertificateChain: @NO,
(id)kCFStreamSSLPeerName: [NSNull null]};
CFReadStreamSetProperty(stream, kCFStreamPropertySSLSettings, (__bridge CFTypeRef)(sslSettings));
}
//
// We're now ready to receive data
//
self.state = AS_WAITING_FOR_DATA;
//
// Open the stream
//
if (!CFReadStreamOpen(stream))
{
CFRelease(stream);
[self presentAlertWithTitle:NSLocalizedStringFromTable(@"File Error", @"Errors", nil)
message:NSLocalizedStringFromTable(@"Unable to configure network read stream.", @"Errors", nil)];
return NO;
}
//
// Set our callback function to receive the data
//
CFStreamClientContext context = {0, (__bridge void *)(self), NULL, NULL, NULL};
CFReadStreamSetClient(
stream,
kCFStreamEventHasBytesAvailable | kCFStreamEventErrorOccurred | kCFStreamEventEndEncountered,
ASReadStreamCallBack,
&context);
CFReadStreamScheduleWithRunLoop(stream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
}
return YES;
}
//
// startInternal
//
// This is the start method for the AudioStream thread. This thread is created
// because it will be blocked when there are no audio buffers idle (and ready
// to receive audio data).
//
// Activity in this thread:
// - Creation and cleanup of all AudioFileStream and AudioQueue objects
// - Receives data from the CFReadStream
// - AudioFileStream processing
// - Copying of data from AudioFileStream into audio buffers
// - Stopping of the thread because of end-of-file
// - Stopping due to error or failure
//
// Activity *not* in this thread:
// - AudioQueue playback and notifications (happens in AudioQueue thread)
// - Actual download of NSURLConnection data (NSURLConnection's thread)
// - Creation of the AudioStreamer (other, likely "main" thread)
// - Invocation of -start method (other, likely "main" thread)
// - User/manual invocation of -stop (other, likely "main" thread)
//
// This method contains bits of the "main" function from Apple's example in
// AudioFileStreamExample.
//
- (void)startInternal
{
@autoreleasepool {
@synchronized(self)
{
if (state != AS_STARTING_FILE_THREAD)
{
if (state != AS_STOPPING &&
state != AS_STOPPED)
{
NSLog(@"### Not starting audio thread. State code is: %ld", (long)state);
}
self.state = AS_INITIALIZED;
return;
}
#if TARGET_OS_IPHONE
//
// Set the audio session category so that we continue to play if the
// iPhone/iPod auto-locks.
//
AudioSessionInitialize (
NULL, // 'NULL' to use the default (main) run loop
NULL, // 'NULL' to use the default run loop mode
ASAudioSessionInterruptionListener, // a reference to your interruption callback
(__bridge void *)(self) // data to pass to your interruption listener callback
);
UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
AudioSessionSetProperty (
kAudioSessionProperty_AudioCategory,
sizeof (sessionCategory),
&sessionCategory
);
AudioSessionSetActive(true);
#endif
// initialize a mutex and condition so that we can block on buffers in use.
pthread_mutex_init(&queueBuffersMutex, NULL);
pthread_cond_init(&queueBufferReadyCondition, NULL);
if (![self openReadStream])
{
goto cleanup;
}
}
//
// Process the run loop until playback is finished or failed.
//
BOOL isRunning = YES;
do
{
isRunning = [[NSRunLoop currentRunLoop]
runMode:NSDefaultRunLoopMode
beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.25]];
@synchronized(self) {
if (seekWasRequested) {
[self internalSeekToTime:requestedSeekTime];
seekWasRequested = NO;
}
}
//
// If there are no queued buffers, we need to check here since the
// handleBufferCompleteForQueue:buffer: should not change the state
// (may not enter the synchronized section).
//
if (buffersUsed == 0 && self.state == AS_PLAYING)
{
err = AudioQueuePause(audioQueue);
if (err)
{
[self failWithErrorCode:AS_AUDIO_QUEUE_PAUSE_FAILED];
return;
}
self.state = AS_BUFFERING;
}
} while (isRunning && ![self runLoopShouldExit]);
cleanup:
@synchronized(self)
{
//
// Cleanup the read stream if it is still open
//
if (stream)
{
CFReadStreamClose(stream);
CFRelease(stream);
stream = nil;
}
//
// Close the audio file strea,
//
if (audioFileStream)
{
err = AudioFileStreamClose(audioFileStream);
audioFileStream = nil;
if (err)
{
[self failWithErrorCode:AS_FILE_STREAM_CLOSE_FAILED];
}
}
//
// Dispose of the Audio Queue
//
if (audioQueue)
{
err = AudioQueueDispose(audioQueue, true);
audioQueue = nil;
if (err)
{
[self failWithErrorCode:AS_AUDIO_QUEUE_DISPOSE_FAILED];
}
}
pthread_mutex_destroy(&queueBuffersMutex);
pthread_cond_destroy(&queueBufferReadyCondition);
#if TARGET_OS_IPHONE
AudioSessionSetActive(false);
#endif
httpHeaders = nil;
bytesFilled = 0;
packetsFilled = 0;
seekByteOffset = 0;
packetBufferSize = 0;
self.state = AS_INITIALIZED;
internalThread = nil;
}
}
}
//
// start
//
// Calls startInternal in a new thread.
//
- (void)start
{
@synchronized (self)
{
if (state == AS_PAUSED)
{
[self pause];
}
else if (state == AS_INITIALIZED)
{
NSAssert([[NSThread currentThread] isEqual:[NSThread mainThread]],
@"Playback can only be started from the main thread.");
notificationCenter =
[NSNotificationCenter defaultCenter];
self.state = AS_STARTING_FILE_THREAD;
internalThread =
[[NSThread alloc]
initWithTarget:self
selector:@selector(startInternal)
object:nil];
[internalThread start];
}
}
}
// internalSeekToTime:
//
// Called from our internal runloop to reopen the stream at a seeked location
//
- (void)internalSeekToTime:(double)newSeekTime
{
if ([self calculatedBitRate] == 0.0 || fileLength <= 0)
{
return;
}
//
// Calculate the byte offset for seeking
//
seekByteOffset = dataOffset +
(newSeekTime / self.duration) * (fileLength - dataOffset);
//
// Attempt to leave 1 useful packet at the end of the file (although in
// reality, this may still seek too far if the file has a long trailer).
//
if (seekByteOffset > fileLength - 2 * packetBufferSize)
{
seekByteOffset = fileLength - 2 * packetBufferSize;
}
//
// Store the old time from the audio queue and the time that we're seeking
// to so that we'll know the correct time progress after seeking.
//
seekTime = newSeekTime;
//
// Attempt to align the seek with a packet boundary
//
double calculatedBitRate = [self calculatedBitRate];
if (packetDuration > 0 &&
calculatedBitRate > 0)
{
UInt32 ioFlags = 0;
SInt64 packetAlignedByteOffset;
SInt64 seekPacket = floor(newSeekTime / packetDuration);
err = AudioFileStreamSeek(audioFileStream, seekPacket, &packetAlignedByteOffset, &ioFlags);
if (!err && !(ioFlags & kAudioFileStreamSeekFlag_OffsetIsEstimated))
{
seekTime -= ((seekByteOffset - dataOffset) - packetAlignedByteOffset) * 8.0 / calculatedBitRate;
seekByteOffset = packetAlignedByteOffset + dataOffset;
}
}
//
// Close the current read straem
//
if (stream)
{
CFReadStreamClose(stream);
CFRelease(stream);
stream = nil;
}
//
// Stop the audio queue
//
self.state = AS_STOPPING;
stopReason = AS_STOPPING_TEMPORARILY;
err = AudioQueueStop(audioQueue, true);
if (err)
{
[self failWithErrorCode:AS_AUDIO_QUEUE_STOP_FAILED];
return;
}
//
// Re-open the file stream. It will request a byte-range starting at
// seekByteOffset.
//
[self openReadStream];
}
//
// seekToTime:
//
// Attempts to seek to the new time. Will be ignored if the bitrate or fileLength
// are unknown.
//
// Parameters:
// newTime - the time to seek to
//
- (void)seekToTime:(double)newSeekTime
{
@synchronized(self)
{
seekWasRequested = YES;
requestedSeekTime = newSeekTime;
}