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qtkitvideosrc: implement zero-copy by using buffer-factory

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This means we'll wrap each CoreVideo buffer inside a GstBuffer instead of
making a copy.
This commit is contained in:
Ole André Vadla Ravnås 2010-11-04 17:47:25 +01:00
parent 835b2988b6
commit 86e2539816
1 changed files with 31 additions and 13 deletions
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44
sys/applemedia/qtkitvideosrc.m
View file

@ -19,6 +19,8 @@
#include "qtkitvideosrc.h"
#import "bufferfactory.h"
#import <QTKit/QTKit.h>
#define DEFAULT_DEVICE_INDEX -1
@ -100,6 +102,7 @@ static GstPushSrcClass * parent_class;
int deviceIndex;
GstAMBufferFactory *bufferFactory;
QTCaptureSession *session;
QTCaptureDeviceInput *input;
QTCaptureDecompressedVideoOutput *output;
@ -166,24 +169,31 @@ static GstPushSrcClass * parent_class;
- (BOOL)openDevice
{
NSString *mediaType;
GError *gerror;
NSString *mediaType = QTMediaTypeVideo;
NSError *error = nil;
mediaType = QTMediaTypeVideo;
bufferFactory = [[GstAMBufferFactory alloc] initWithError:&gerror];
if (bufferFactory == nil) {
GST_ELEMENT_ERROR (element, RESOURCE, FAILED, ("API error"),
("%s", gerror->message));
g_clear_error (&gerror);
goto openFailed;
}
if (deviceIndex == -1) {
device = [QTCaptureDevice defaultInputDeviceWithMediaType:mediaType];
if (device == nil) {
GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
("No video capture devices found"), (NULL));
return NO;
goto openFailed;
}
} else {
NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:mediaType];
if (deviceIndex >= [devices count]) {
GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
("Invalid video capture device index"), (NULL));
return NO;
goto openFailed;
}
device = [devices objectAtIndex:deviceIndex];
}
@ -195,12 +205,22 @@ static GstPushSrcClass * parent_class;
GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
("Failed to open device '%s'",
[[device localizedDisplayName] UTF8String]), (NULL));
[device release];
device = nil;
return NO;
goto openFailed;
}
return YES;
/* ERRORS */
openFailed:
{
[device release];
device = nil;
[bufferFactory release];
bufferFactory = nil;
return NO;
}
}
- (void)closeDevice
@ -218,6 +238,9 @@ static GstPushSrcClass * parent_class;
[device release];
device = nil;
[bufferFactory release];
bufferFactory = nil;
}
- (BOOL)setCaps:(GstCaps *)caps
@ -383,12 +406,7 @@ static GstPushSrcClass * parent_class;
[queueLock unlockWithCondition:
([queue count] == 0) ? NO_FRAMES : HAS_FRAME_OR_STOP_REQUEST];
*buf = gst_buffer_new_and_alloc (
CVPixelBufferGetBytesPerRow (frame) * CVPixelBufferGetHeight (frame));
CVPixelBufferLockBaseAddress (frame, 0);
memcpy (GST_BUFFER_DATA (*buf), CVPixelBufferGetBaseAddress (frame),
GST_BUFFER_SIZE (*buf));
CVPixelBufferUnlockBaseAddress (frame, 0);
*buf = [bufferFactory createGstBufferForCoreVideoBuffer:frame];
CVBufferRelease (frame);
[self timestampBuffer:*buf];