From: sharpbai <[email protected]>
feature: add scaleFactor attribute for avfoundation
added by: [email protected]
added by: [email protected]
---
doc/indevs.texi | 6 ++++++
libavdevice/avfoundation.m | 8 ++++++++
2 files changed, 14 insertions(+)
diff --git a/doc/indevs.texi b/doc/indevs.texi
index 09e3321..3d25930 100644
--- a/doc/indevs.texi
+++ b/doc/indevs.texi
@@ -139,6 +139,12 @@ Capture the mouse pointer. Default is 0.
@item -capture_mouse_clicks
Capture the screen mouse clicks. Default is 0.
+@item -scale_factor
+Scale factor for capture the screen. Set this property to scale the buffers
+by a given factor. For example a 320x240 capture area with a scale_factor of
2.0
+produces video buffers at 640x480. Another example a 320x240 capture area with
+a scale_factor of 0.5 produces video buffers at 160x120. Default is 1.0 (no
scaling).
+
@end table
@subsection Examples
diff --git a/libavdevice/avfoundation.m b/libavdevice/avfoundation.m
index e2ddf47..3764de8 100644
--- a/libavdevice/avfoundation.m
+++ b/libavdevice/avfoundation.m
@@ -96,6 +96,7 @@ typedef struct
int capture_cursor;
int capture_mouse_clicks;
+ float scale_factor;
int list_devices;
int video_device_index;
@@ -735,6 +736,12 @@ static int avf_read_header(AVFormatContext *s)
capture_screen_input.minFrameDuration =
CMTimeMake(ctx->framerate.den, ctx->framerate.num);
}
+ if (ctx->scale_factor <= 2.0 && ctx->scale_factor > 0.0) {
+ capture_screen_input.scaleFactor = ctx->scale_factor;
+ } else {
+ av_log(ctx, AV_LOG_ERROR, "The value of scale_factor must be
more than 0.0 and less than or equal to 2.0");
+ }
+
#if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
if (ctx->capture_cursor) {
capture_screen_input.capturesCursor = YES;
@@ -1025,6 +1032,7 @@ static const AVOption options[] = {
{ "video_size", "set video size", offsetof(AVFContext, width),
AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
{ "capture_cursor", "capture the screen cursor", offsetof(AVFContext,
capture_cursor), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ "capture_mouse_clicks", "capture the screen mouse clicks",
offsetof(AVFContext, capture_mouse_clicks), AV_OPT_TYPE_INT, {.i64=0}, 0, 1,
AV_OPT_FLAG_DECODING_PARAM },
+ { "scale_factor", "scale screen factor range", offsetof(AVFContext,
scale_factor), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, 0.0, 2.0,
AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};
--
2.2.1
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