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avfvideosrc: fix build with older SDK not supporting AVDeviceFormat

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AVDeviceFormat and AVFrameRateRange are available in iOS since 7.0
so we need a more dynamic approach to support compilation with older
SDK's. We use a NSObject to avoid referencing those types and key-value
coding or preformSelector to access properties.
This commit is contained in:
Andoni Morales Alastruey 2013-11-07 12:20:31 +01:00
parent 46a61ea036
commit a2b90eeb8c
1 changed files with 31 additions and 16 deletions
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47
sys/applemedia/avfvideosrc.m
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@ -360,14 +360,22 @@ didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
GST_DEBUG_OBJECT (element, "Getting device caps");
for (AVCaptureDeviceFormat *f in [formats reverseObjectEnumerator]) {
CMFormatDescriptionRef formatDescription = f.formatDescription;
CMVideoDimensions dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
/* Do not use AVCaptureDeviceFormat or AVFrameRateRange only
* available in iOS >= 7.0. We use a dynamic approach with key-value
* coding or performSelector */
for (NSObject *f in [formats reverseObjectEnumerator]) {
CMFormatDescriptionRef formatDescription;
CMVideoDimensions dimensions;
for (AVFrameRateRange *rate in f.videoSupportedFrameRateRanges) {
/* formatDescription can't be retrieved with valueForKey so use a selector here */
formatDescription = (CMFormatDescriptionRef) [f performSelector:@selector(formatDescription)];
dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
for (NSObject *rate in [f valueForKey:@"videoSupportedFrameRateRanges"]) {
int fps_n, fps_d;
gdouble max_fps;
gst_util_double_to_fraction (rate.maxFrameRate, &fps_n, &fps_d);
[[rate valueForKey:@"maxFrameRate"] getValue:&max_fps];
gst_util_double_to_fraction (max_fps, &fps_n, &fps_d);
for (NSNumber *pixel_format in pixel_formats) {
GstVideoFormat gst_format = [self getGstVideoFormat:pixel_format];
@ -390,22 +398,29 @@ didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
GST_DEBUG_OBJECT (element, "Setting device caps");
if ([device lockForConfiguration:NULL] == YES) {
for (AVCaptureDeviceFormat *f in formats) {
CMFormatDescriptionRef formatDescription = f.formatDescription;
CMVideoDimensions dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
for (NSObject *f in formats) {
CMFormatDescriptionRef formatDescription;
CMVideoDimensions dimensions;
formatDescription = (CMFormatDescriptionRef) [f performSelector:@selector(formatDescription)];
dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
if (dimensions.width == info->width && dimensions.height == info->height) {
found_format = TRUE;
device.activeFormat = f;
for (AVFrameRateRange *rate in f.videoSupportedFrameRateRanges) {
if (abs (framerate - rate.maxFrameRate) < 0.00001) {
[device setValue:f forKey:@"activeFormat"];
for (NSObject *rate in [f valueForKey:@"videoSupportedFrameRateRanges"]) {
gdouble max_frame_rate;
[[rate valueForKey:@"maxFrameRate"] getValue:&max_frame_rate];
if (abs (framerate - max_frame_rate) < 0.00001) {
NSValue *min_frame_duration, *max_frame_duration;
found_framerate = TRUE;
device.activeVideoMinFrameDuration = rate.minFrameDuration;
[device setValue:[NSValue valueWithCMTime:rate.minFrameDuration]
forKey:@"activeVideoMinFrameDuration"];
min_frame_duration = [rate valueForKey:@"minFrameDuration"];
max_frame_duration = [rate valueForKey:@"maxFrameDuration"];
[device setValue:min_frame_duration forKey:@"activeVideoMinFrameDuration"];
@try {
/* Only available on OSX >= 10.8 and iOS >= 7.0 */
[device setValue:[NSValue valueWithCMTime:rate.maxFrameDuration]
forKey:@"activeVideoMaxFrameDuration"];
[device setValue:max_frame_duration forKey:@"activeVideoMaxFrameDuration"];
} @catch (NSException *exception) {
if (![[exception name] isEqualTo:NSUndefinedKeyException]) {
GST_WARNING ("An unexcepted error occured: %s",