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libavdevice/avfoundation: add framerate and video size options

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Support framerate ands video size options on AVCaptureDevices for
OSX >= 10.7 and iOS >= 7.0.

For screen captures, only the framerate option is taken into account.

Reviewed-by: Thilo Borgmann <thilo.borgmann@mail.de>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
pull/127/head
Matthieu Bouron 10 years ago committed by Michael Niedermayer
parent 6a3833e141
commit 573a77a1b6
1 changed files with 130 additions and 0 deletions
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  1. 130
      libavdevice/avfoundation.m

130
libavdevice/avfoundation.m
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@ -33,6 +33,7 @@
#include "libavutil/avstring.h"
#include "libavformat/internal.h"
#include "libavutil/internal.h"
#include "libavutil/parseutils.h"
#include "libavutil/time.h"
#include "avdevice.h"
@ -90,6 +91,9 @@ typedef struct
id avf_delegate;
id avf_audio_delegate;
AVRational framerate;
int width, height;
int list_devices;
int video_device_index;
int video_stream_index;
@ -263,9 +267,103 @@ static void parse_device_name(AVFormatContext *s)
}
}
/**
* Configure the video device.
*
* Configure the video device using a run-time approach to access properties
* since formats, activeFormat are available since iOS >= 7.0 or OSX >= 10.7
* and activeVideoMaxFrameDuration is available since i0S >= 7.0 and OSX >= 10.9.
*
* The NSUndefinedKeyException must be handled by the caller of this function.
*
*/
static int configure_video_device(AVFormatContext *s, AVCaptureDevice *video_device)
{
AVFContext *ctx = (AVFContext*)s->priv_data;
double framerate = av_q2d(ctx->framerate);
NSObject *range = nil;
NSObject *format = nil;
NSObject *selected_range = nil;
NSObject *selected_format = nil;
for (format in [video_device valueForKey:@"formats"]) {
CMFormatDescriptionRef formatDescription;
CMVideoDimensions dimensions;
formatDescription = (CMFormatDescriptionRef) [format performSelector:@selector(formatDescription)];
dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
if ((ctx->width == 0 && ctx->height == 0) ||
(dimensions.width == ctx->width && dimensions.height == ctx->height)) {
selected_format = format;
for (range in [format valueForKey:@"videoSupportedFrameRateRanges"]) {
double max_framerate;
[[range valueForKey:@"maxFrameRate"] getValue:&max_framerate];
if (fabs (framerate - max_framerate) < 0.01) {
selected_range = range;
break;
}
}
}
}
if (!selected_format) {
av_log(s, AV_LOG_ERROR, "Selected video size (%dx%d) is not supported by the device\n",
ctx->width, ctx->height);
goto unsupported_format;
}
if (!selected_range) {
av_log(s, AV_LOG_ERROR, "Selected framerate (%f) is not supported by the device\n",
framerate);
goto unsupported_format;
}
if ([video_device lockForConfiguration:NULL] == YES) {
NSValue *min_frame_duration = [selected_range valueForKey:@"minFrameDuration"];
[video_device setValue:selected_format forKey:@"activeFormat"];
[video_device setValue:min_frame_duration forKey:@"activeVideoMinFrameDuration"];
[video_device setValue:min_frame_duration forKey:@"activeVideoMaxFrameDuration"];
} else {
av_log(s, AV_LOG_ERROR, "Could not lock device for configuration");
return AVERROR(EINVAL);
}
return 0;
unsupported_format:
av_log(s, AV_LOG_ERROR, "Supported modes:\n");
for (format in [video_device valueForKey:@"formats"]) {
CMFormatDescriptionRef formatDescription;
CMVideoDimensions dimensions;
formatDescription = (CMFormatDescriptionRef) [format performSelector:@selector(formatDescription)];
dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
for (range in [format valueForKey:@"videoSupportedFrameRateRanges"]) {
double min_framerate;
double max_framerate;
[[range valueForKey:@"minFrameRate"] getValue:&min_framerate];
[[range valueForKey:@"maxFrameRate"] getValue:&max_framerate];
av_log(s, AV_LOG_ERROR, " %dx%d@[%f %f]fps\n",
dimensions.width, dimensions.height,
min_framerate, max_framerate);
}
}
return AVERROR(EINVAL);
}
static int add_video_device(AVFormatContext *s, AVCaptureDevice *video_device)
{
AVFContext *ctx = (AVFContext*)s->priv_data;
int ret;
NSError *error = nil;
AVCaptureInput* capture_input = nil;
struct AVFPixelFormatSpec pxl_fmt_spec;
@ -300,6 +398,18 @@ static int add_video_device(AVFormatContext *s, AVCaptureDevice *video_device)
return 1;
}
// Configure device framerate and video size
@try {
if ((ret = configure_video_device(s, video_device)) < 0) {
return ret;
}
} @catch (NSException *exception) {
if (![[exception name] isEqualToString:NSUndefinedKeyException]) {
av_log (s, AV_LOG_ERROR, "An error occured: %s", [exception.reason UTF8String]);
return AVERROR_EXTERNAL;
}
}
// select pixel format
pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE;
@ -549,6 +659,7 @@ static int get_audio_config(AVFormatContext *s)
static int avf_read_header(AVFormatContext *s)
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
int capture_screen = 0;
uint32_t num_screens = 0;
AVFContext *ctx = (AVFContext*)s->priv_data;
AVCaptureDevice *video_device = nil;
@ -616,7 +727,13 @@ static int avf_read_header(AVFormatContext *s)
CGDirectDisplayID screens[num_screens];
CGGetActiveDisplayList(num_screens, screens, &num_screens);
AVCaptureScreenInput* capture_screen_input = [[[AVCaptureScreenInput alloc] initWithDisplayID:screens[ctx->video_device_index - ctx->num_video_devices]] autorelease];
if (ctx->framerate.num > 0) {
capture_screen_input.minFrameDuration = CMTimeMake(ctx->framerate.den, ctx->framerate.num);
}
video_device = (AVCaptureDevice*) capture_screen_input;
capture_screen = 1;
#endif
} else {
av_log(ctx, AV_LOG_ERROR, "Invalid device index\n");
@ -645,6 +762,11 @@ static int avf_read_header(AVFormatContext *s)
AVCaptureScreenInput* capture_screen_input = [[[AVCaptureScreenInput alloc] initWithDisplayID:screens[idx]] autorelease];
video_device = (AVCaptureDevice*) capture_screen_input;
ctx->video_device_index = ctx->num_video_devices + idx;
capture_screen = 1;
if (ctx->framerate.num > 0) {
capture_screen_input.minFrameDuration = CMTimeMake(ctx->framerate.den, ctx->framerate.num);
}
}
}
#endif
@ -715,6 +837,12 @@ static int avf_read_header(AVFormatContext *s)
[ctx->capture_session startRunning];
/* Unlock device configuration only after the session is started so it
* does not reset the capture formats */
if (!capture_screen) {
[video_device unlockForConfiguration];
}
if (video_device && get_video_config(s)) {
goto fail;
}
@ -853,6 +981,8 @@ static const AVOption options[] = {
{ "video_device_index", "select video device by index for devices with same name (starts at 0)", offsetof(AVFContext, video_device_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
{ "audio_device_index", "select audio device by index for devices with same name (starts at 0)", offsetof(AVFContext, audio_device_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
{ "pixel_format", "set pixel format", offsetof(AVFContext, pixel_format), AV_OPT_TYPE_PIXEL_FMT, {.i64 = AV_PIX_FMT_YUV420P}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM},
{ "framerate", "set frame rate", offsetof(AVFContext, framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "ntsc"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
{ "video_size", "set video size", offsetof(AVFContext, width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};

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