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screen-cast-src: Add VideoCrop support

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To be able to cast windows, which by definition can change in size
dynamically, we need a way to specify the video crop meta to adjust to
the window size whenever it changes.

Add VideoCrop support with a new optional hook `get_videocrop()` in the
`ScreenCastStreamSrcClass` which, if defined, can let the child specify
a rectangle for the video cropping area.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/306
(cherry picked from commit f64eba57ce)
This commit is contained in:
Olivier Fourdan 2018-11-22 11:59:10 +01:00 committed by Ray Strode
parent a96f057ff1
commit 9cde0a78d8
2 changed files with 55 additions and 4 deletions
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56
src/backends/meta-screen-cast-stream-src.c
View File

@ -91,6 +91,9 @@ typedef struct _MetaScreenCastStreamSrcPrivate
struct spa_video_info_raw video_format;
uint64_t last_frame_timestamp_us;
int stream_width;
int stream_height;
} MetaScreenCastStreamSrcPrivate;
static void
@ -117,6 +120,19 @@ meta_screen_cast_stream_src_get_specs (MetaScreenCastStreamSrc *src,
klass->get_specs (src, width, height, frame_rate);
}
static gboolean
meta_screen_cast_stream_src_get_videocrop (MetaScreenCastStreamSrc *src,
MetaRectangle *crop_rect)
{
MetaScreenCastStreamSrcClass *klass =
META_SCREEN_CAST_STREAM_SRC_GET_CLASS (src);
if (klass->get_videocrop)
return klass->get_videocrop (src, crop_rect);
return FALSE;
}
static void
meta_screen_cast_stream_src_record_frame (MetaScreenCastStreamSrc *src,
uint8_t *data)
@ -132,8 +148,10 @@ meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src)
{
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
MetaRectangle crop_rect;
struct pw_buffer *buffer;
struct spa_buffer *spa_buffer;
struct spa_meta_video_crop *spa_meta_video_crop;
uint8_t *map = NULL;
uint8_t *data;
uint64_t now_us;
@ -182,6 +200,27 @@ meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src)
}
meta_screen_cast_stream_src_record_frame (src, data);
/* Update VideoCrop if needed */
spa_meta_video_crop = spa_buffer_find_meta (spa_buffer, priv->pipewire_type->meta.VideoCrop);
if (spa_meta_video_crop)
{
if (meta_screen_cast_stream_src_get_videocrop (src, &crop_rect))
{
spa_meta_video_crop->x = crop_rect.x;
spa_meta_video_crop->y = crop_rect.y;
spa_meta_video_crop->width = crop_rect.width;
spa_meta_video_crop->height = crop_rect.height;
}
else
{
spa_meta_video_crop->x = 0;
spa_meta_video_crop->y = 0;
spa_meta_video_crop->width = priv->stream_width;
spa_meta_video_crop->height = priv->stream_height;
}
}
priv->last_frame_timestamp_us = now_us;
if (map)
@ -275,7 +314,7 @@ on_stream_format_changed (void *data,
uint8_t params_buffer[1024];
int32_t width, height, stride, size;
struct spa_pod_builder pod_builder;
const struct spa_pod *params[1];
const struct spa_pod *params[2];
const int bpp = 4;
if (!format)
@ -303,6 +342,12 @@ on_stream_format_changed (void *data,
":", pipewire_type->param_buffers.buffers, "iru", 16, PROP_RANGE (2, 16),
":", pipewire_type->param_buffers.align, "i", 16);
params[1] = spa_pod_builder_object (
&pod_builder,
pipewire_type->param.idMeta, pipewire_type->param_meta.Meta,
":", pipewire_type->param_meta.type, "I", pipewire_type->meta.VideoCrop,
":", pipewire_type->param_meta.size, "i", sizeof (struct spa_meta_video_crop));
pw_stream_finish_format (priv->pipewire_stream, 0,
params, G_N_ELEMENTS (params));
}
@ -325,7 +370,6 @@ create_pipewire_stream (MetaScreenCastStreamSrc *src,
SPA_POD_BUILDER_INIT (buffer, sizeof (buffer));
MetaSpaType *spa_type = &priv->spa_type;
struct pw_type *pipewire_type = priv->pipewire_type;
int width, height;
float frame_rate;
MetaFraction frame_rate_fraction;
struct spa_fraction max_framerate;
@ -344,7 +388,10 @@ create_pipewire_stream (MetaScreenCastStreamSrc *src,
return NULL;
}
meta_screen_cast_stream_src_get_specs (src, &width, &height, &frame_rate);
meta_screen_cast_stream_src_get_specs (src,
&priv->stream_width,
&priv->stream_height,
&frame_rate);
frame_rate_fraction = meta_fraction_from_double (frame_rate);
min_framerate = SPA_FRACTION (1, 1);
@ -357,7 +404,8 @@ create_pipewire_stream (MetaScreenCastStreamSrc *src,
"I", spa_type->media_type.video,
"I", spa_type->media_subtype.raw,
":", spa_type->format_video.format, "I", spa_type->video_format.BGRx,
":", spa_type->format_video.size, "R", &SPA_RECTANGLE (width, height),
":", spa_type->format_video.size, "R", &SPA_RECTANGLE (priv->stream_width,
priv->stream_height),
":", spa_type->format_video.framerate, "F", &SPA_FRACTION (0, 1),
":", spa_type->format_video.max_framerate, "Fru", &max_framerate,
PROP_RANGE (&min_framerate,

3
src/backends/meta-screen-cast-stream-src.h
View File

@ -26,6 +26,7 @@
#include <glib-object.h>
#include "clutter/clutter.h"
#include "meta/boxes.h"
typedef struct _MetaScreenCastStream MetaScreenCastStream;
@ -47,6 +48,8 @@ struct _MetaScreenCastStreamSrcClass
void (* disable) (MetaScreenCastStreamSrc *src);
void (* record_frame) (MetaScreenCastStreamSrc *src,
uint8_t *data);
gboolean (* get_videocrop) (MetaScreenCastStreamSrc *src,
MetaRectangle *crop_rect);
};
void meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src);