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DUXBetaAudioFilePCMParser.m
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DUXBetaAudioFilePCMParser.m
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//
// DUXBetaAudioFilePCMParser.m
// UXSDKCore
//
// MIT License
//
// Copyright © 2018-2020 DJI
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
#import "DUXBetaAudioFilePCMParser.h"
#import <AudioToolbox/AudioToolbox.h>
@interface DUXBetaAudioFilePCMParser ()
@property (strong, nonatomic) NSURL *url;
@end
@implementation DUXBetaAudioFilePCMParser
- (instancetype)initWithFile:(NSURL *)url {
self = [super init];
if (self) {
_url = url;
}
return self;
}
- (void)startParser {
if (!self.delegate || ![self.delegate respondsToSelector:@selector(pcmParser:pcmData:numberOfFrames:)]) {
return;
}
ExtAudioFileRef sourceFile = nil;
if (![self checkError:ExtAudioFileOpenURL((__bridge CFURLRef)self.url, &sourceFile) description:@"ExtAudioFileGetProperty couldn't get the source data format"]) {
if (sourceFile) {
ExtAudioFileDispose(sourceFile);
}
return;
}
AudioStreamBasicDescription sourceFormat;
uint32_t size = sizeof(AudioStreamBasicDescription);
if (![self checkError:ExtAudioFileGetProperty(sourceFile, kExtAudioFileProperty_FileDataFormat, &size, &sourceFormat) description:@"ExtAudioFileGetProperty couldn't get the source data format"]) {
if (sourceFile) {
ExtAudioFileDispose(sourceFile);
}
return;
}
uint32_t bufferByteSize = 16384;
uint8_t *sourceBuffer = malloc(bufferByteSize);
while (true) {
AudioBufferList fillBufferList;
fillBufferList.mNumberBuffers = 1;
fillBufferList.mBuffers->mNumberChannels = 1;
fillBufferList.mBuffers->mDataByteSize = bufferByteSize;
fillBufferList.mBuffers->mData = sourceBuffer;
uint32_t numberOfFrames = 0;
if (sourceFormat.mBytesPerFrame > 0) {
numberOfFrames = bufferByteSize / sourceFormat.mBytesPerFrame;
}
if (![self checkError:ExtAudioFileRead(sourceFile, &numberOfFrames, &fillBufferList) description:@"ExtAudioFileRead failed!"]) {
break;
}
if (numberOfFrames <= 0) {
if (self.delegate && [self.delegate respondsToSelector:@selector(pcmParserDidFinish:)]) {
[self.delegate pcmParserDidFinish:self];
}
break;
}
NSData *data = [NSData dataWithBytes:fillBufferList.mBuffers->mData length:fillBufferList.mBuffers->mDataByteSize];
[self.delegate pcmParser:self pcmData:data numberOfFrames:numberOfFrames];
}
free(sourceBuffer);
if (sourceFile) {
ExtAudioFileDispose(sourceFile);
}
}
- (BOOL)checkError:(OSStatus)errorCode description:(NSString *)description {
if (errorCode == noErr) {
return YES;
}
NSError *error = [[NSError alloc] initWithDomain:@"AudioFilePCMParser" code:errorCode userInfo:@{NSLocalizedDescriptionKey: description}];
NSLog(@"Error: %@", error);
return NO;
}
@end