2017-07-31 21:32 GMT+08:00 sharpbai <sharp...@gmail.com>:
> From: sharpbai <tian....@duobei.com>
>
> feature: add scaleFactor attribute for avfoundation
> added by: siyuan.w...@duobei.com
> added by: yiren...@duobei.com
> ---
> doc/indevs.texi | 6 ++++++
> libavdevice/avfoundation.m | 6 ++++++
> 2 files changed, 12 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..1aec234 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 +736,10 @@ static int avf_read_header(AVFormatContext *s)
> capture_screen_input.minFrameDuration =
> CMTimeMake(ctx->framerate.den, ctx->framerate.num);
> }
>
> + if (ctx->scale_factor != 1 && ctx->scale_factor > 0) {
if the scale_factor is fload, this check maybe need attention, about
code secure
> + capture_screen_input.scaleFactor = ctx->scale_factor;
> + }
> +
> #if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
> if (ctx->capture_cursor) {
> capture_screen_input.capturesCursor = YES;
> @@ -1025,6 +1030,7 @@ 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, 2, AV_OPT_FLAG_DECODING_PARAM
> },
As Thilo's suggest, this default maybe 1.0 better.
>
> { NULL },
> };
> --
> 2.2.1
>
> _______________________________________________
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> ffmpeg-devel@ffmpeg.org
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