AVRecorder/AVCaptureDeviceFormat_AVRecorderAdditions.m
/* |
File: AVCaptureDeviceFormat_AVRecorderAdditions.m |
Abstract: n/a |
Version: 2.1 |
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*/ |
#import "AVCaptureDeviceFormat_AVRecorderAdditions.h" |
@implementation AVCaptureDeviceFormat (AVRecorderAdditions) |
- (NSString *)localizedName |
{ |
NSString *localizedName = nil; |
CMMediaType mediaType = CMFormatDescriptionGetMediaType([self formatDescription]); |
switch (mediaType) |
{ |
case kCMMediaType_Video: |
{ |
CFStringRef formatName = CMFormatDescriptionGetExtension([self formatDescription], kCMFormatDescriptionExtension_FormatName); |
CMVideoDimensions dimensions = CMVideoFormatDescriptionGetDimensions((CMVideoFormatDescriptionRef)[self formatDescription]); |
localizedName = [NSString stringWithFormat:@"%@, %d x %d", formatName, dimensions.width, dimensions.height]; |
} |
break; |
case kCMMediaType_Audio: |
{ |
CFStringRef formatName = NULL; |
AudioStreamBasicDescription const *originalASBDPtr = CMAudioFormatDescriptionGetStreamBasicDescription((CMAudioFormatDescriptionRef)[self formatDescription]); |
if (originalASBDPtr) |
{ |
size_t channelLayoutSize = 0; |
AudioChannelLayout const *channelLayoutPtr = CMAudioFormatDescriptionGetChannelLayout((CMAudioFormatDescriptionRef)[self formatDescription], &channelLayoutSize); |
CFStringRef channelLayoutName = NULL; |
if (channelLayoutPtr && (channelLayoutSize > 0)) |
{ |
UInt32 propertyDataSize = (UInt32)sizeof(channelLayoutName); |
AudioFormatGetProperty(kAudioFormatProperty_ChannelLayoutName, (UInt32)channelLayoutSize, channelLayoutPtr, &propertyDataSize, &channelLayoutName); |
} |
if (channelLayoutName && (0 == CFStringGetLength(channelLayoutName))) |
{ |
CFRelease(channelLayoutName); |
channelLayoutName = NULL; |
} |
AudioStreamBasicDescription modifiedASBD = *originalASBDPtr; |
if (channelLayoutName) |
{ |
// If the format will include the description of a channel layout, zero out mChannelsPerFrame so that the number of channels does not redundantly appear in the format string. |
modifiedASBD.mChannelsPerFrame = 0; |
} |
UInt32 propertyDataSize = (UInt32)sizeof(formatName); |
AudioFormatGetProperty(kAudioFormatProperty_FormatName, (UInt32)sizeof(modifiedASBD), &modifiedASBD, &propertyDataSize, &formatName); |
if (!formatName) |
{ |
formatName = CMFormatDescriptionGetExtension([self formatDescription], kCMFormatDescriptionExtension_FormatName); |
if (formatName) |
CFRetain(formatName); |
} |
if (formatName) |
{ |
if (channelLayoutName) |
{ |
localizedName = [NSString stringWithFormat:@"%@, %@", formatName, channelLayoutName]; |
} |
else |
{ |
localizedName = [NSString stringWithFormat:@"%@", formatName]; |
} |
CFRelease(formatName); |
} |
if (channelLayoutName) |
CFRelease(channelLayoutName); |
} |
} |
break; |
default: |
break; |
} |
return localizedName; |
} |
@end |
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