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mutter/src/backends/meta-screen-cast-stream-src.c
Jonas Ådahl c8e12ead08 screen-cast-src: Notify about the stream being closed after dispatch 
We're iterating inside the PipeWire loop when detecting PipeWire errors,
and shouldn't destroy the PipeWire objects mid-iteration. Avoid this by
first disabling the stream src (effectively stopping the recording),
then notifying about it being closed in an idle callback. The
notification eventually makes the rest of the screen cast code clean up
the objects, including the src and the associated PipeWire objects, but
will do so outside the PipeWire loop iteration.

Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1251

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1251
2020-05-22 00:15:48 +00:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright (C) 2015-2017 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
*/
#include "config.h"
#include "backends/meta-screen-cast-stream-src.h"
#include <errno.h>
#include <fcntl.h>
#include <pipewire/pipewire.h>
#include <spa/param/props.h>
#include <spa/param/format-utils.h>
#include <spa/param/video/format-utils.h>
#include <spa/utils/result.h>
#include <stdint.h>
#include <sys/mman.h>
#include "backends/meta-screen-cast-session.h"
#include "backends/meta-screen-cast-stream.h"
#include "clutter/clutter-mutter.h"
#include "core/meta-fraction.h"
#include "meta/boxes.h"
#define PRIVATE_OWNER_FROM_FIELD(TypeName, field_ptr, field_name) \
(TypeName *)((guint8 *)(field_ptr) - G_PRIVATE_OFFSET (TypeName, field_name))
#define CURSOR_META_SIZE(width, height) \
(sizeof (struct spa_meta_cursor) + \
sizeof (struct spa_meta_bitmap) + width * height * 4)
enum
{
PROP_0,
PROP_STREAM,
};
enum
{
READY,
CLOSED,
N_SIGNALS
};
static guint signals[N_SIGNALS];
typedef struct _MetaPipeWireSource
{
GSource base;
MetaScreenCastStreamSrc *src;
struct pw_loop *pipewire_loop;
} MetaPipeWireSource;
typedef struct _MetaScreenCastStreamSrcPrivate
{
MetaScreenCastStream *stream;
struct pw_context *pipewire_context;
struct pw_core *pipewire_core;
MetaPipeWireSource *pipewire_source;
struct spa_hook pipewire_core_listener;
gboolean is_enabled;
gboolean emit_closed_after_dispatch;
struct pw_stream *pipewire_stream;
struct spa_hook pipewire_stream_listener;
uint32_t node_id;
struct spa_video_info_raw video_format;
int video_stride;
uint64_t last_frame_timestamp_us;
GHashTable *dmabuf_handles;
int stream_width;
int stream_height;
} MetaScreenCastStreamSrcPrivate;
static void
meta_screen_cast_stream_src_init_initable_iface (GInitableIface *iface);
G_DEFINE_TYPE_WITH_CODE (MetaScreenCastStreamSrc,
meta_screen_cast_stream_src,
G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
meta_screen_cast_stream_src_init_initable_iface)
G_ADD_PRIVATE (MetaScreenCastStreamSrc))
static void
meta_screen_cast_stream_src_get_specs (MetaScreenCastStreamSrc *src,
int *width,
int *height,
float *frame_rate)
{
MetaScreenCastStreamSrcClass *klass =
META_SCREEN_CAST_STREAM_SRC_GET_CLASS (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 gboolean
meta_screen_cast_stream_src_record_frame (MetaScreenCastStreamSrc *src,
uint8_t *data)
{
MetaScreenCastStreamSrcClass *klass =
META_SCREEN_CAST_STREAM_SRC_GET_CLASS (src);
return klass->record_frame (src, data);
}
static gboolean
meta_screen_cast_stream_src_blit_to_framebuffer (MetaScreenCastStreamSrc *src,
CoglFramebuffer *framebuffer)
{
MetaScreenCastStreamSrcClass *klass =
META_SCREEN_CAST_STREAM_SRC_GET_CLASS (src);
return klass->blit_to_framebuffer (src, framebuffer);
}
static void
meta_screen_cast_stream_src_set_cursor_metadata (MetaScreenCastStreamSrc *src,
struct spa_meta_cursor *spa_meta_cursor)
{
MetaScreenCastStreamSrcClass *klass =
META_SCREEN_CAST_STREAM_SRC_GET_CLASS (src);
if (klass->set_cursor_metadata)
klass->set_cursor_metadata (src, spa_meta_cursor);
}
static gboolean
draw_cursor_sprite_via_offscreen (MetaScreenCastStreamSrc *src,
CoglTexture *cursor_texture,
int bitmap_width,
int bitmap_height,
uint8_t *bitmap_data,
GError **error)
{
MetaScreenCastStream *stream = meta_screen_cast_stream_src_get_stream (src);
MetaScreenCastSession *session = meta_screen_cast_stream_get_session (stream);
MetaScreenCast *screen_cast =
meta_screen_cast_session_get_screen_cast (session);
MetaBackend *backend = meta_screen_cast_get_backend (screen_cast);
ClutterBackend *clutter_backend = meta_backend_get_clutter_backend (backend);
CoglContext *cogl_context =
clutter_backend_get_cogl_context (clutter_backend);
CoglTexture2D *bitmap_texture;
CoglOffscreen *offscreen;
CoglFramebuffer *fb;
CoglPipeline *pipeline;
CoglColor clear_color;
bitmap_texture = cogl_texture_2d_new_with_size (cogl_context,
bitmap_width, bitmap_height);
cogl_primitive_texture_set_auto_mipmap (COGL_PRIMITIVE_TEXTURE (bitmap_texture),
FALSE);
if (!cogl_texture_allocate (COGL_TEXTURE (bitmap_texture), error))
{
cogl_object_unref (bitmap_texture);
return FALSE;
}
offscreen = cogl_offscreen_new_with_texture (COGL_TEXTURE (bitmap_texture));
fb = COGL_FRAMEBUFFER (offscreen);
cogl_object_unref (bitmap_texture);
if (!cogl_framebuffer_allocate (fb, error))
{
cogl_object_unref (fb);
return FALSE;
}
pipeline = cogl_pipeline_new (cogl_context);
cogl_pipeline_set_layer_texture (pipeline, 0, cursor_texture);
cogl_pipeline_set_layer_filters (pipeline, 0,
COGL_PIPELINE_FILTER_LINEAR,
COGL_PIPELINE_FILTER_LINEAR);
cogl_color_init_from_4ub (&clear_color, 0, 0, 0, 0);
cogl_framebuffer_clear (fb, COGL_BUFFER_BIT_COLOR, &clear_color);
cogl_framebuffer_draw_rectangle (fb, pipeline,
-1, 1, 1, -1);
cogl_object_unref (pipeline);
cogl_framebuffer_read_pixels (fb,
0, 0,
bitmap_width, bitmap_height,
COGL_PIXEL_FORMAT_RGBA_8888_PRE,
bitmap_data);
cogl_object_unref (fb);
return TRUE;
}
gboolean
meta_screen_cast_stream_src_draw_cursor_into (MetaScreenCastStreamSrc *src,
CoglTexture *cursor_texture,
float scale,
uint8_t *data,
GError **error)
{
int texture_width, texture_height;
int width, height;
texture_width = cogl_texture_get_width (cursor_texture);
texture_height = cogl_texture_get_height (cursor_texture);
width = texture_width * scale;
height = texture_height * scale;
if (texture_width == width &&
texture_height == height)
{
cogl_texture_get_data (cursor_texture,
COGL_PIXEL_FORMAT_RGBA_8888_PRE,
texture_width * 4,
data);
}
else
{
if (!draw_cursor_sprite_via_offscreen (src,
cursor_texture,
width,
height,
data,
error))
return FALSE;
}
return TRUE;
}
void
meta_screen_cast_stream_src_unset_cursor_metadata (MetaScreenCastStreamSrc *src,
struct spa_meta_cursor *spa_meta_cursor)
{
spa_meta_cursor->id = 1;
}
void
meta_screen_cast_stream_src_set_cursor_position_metadata (MetaScreenCastStreamSrc *src,
struct spa_meta_cursor *spa_meta_cursor,
int x,
int y)
{
spa_meta_cursor->id = 1;
spa_meta_cursor->position.x = x;
spa_meta_cursor->position.y = y;
spa_meta_cursor->hotspot.x = 0;
spa_meta_cursor->hotspot.y = 0;
spa_meta_cursor->bitmap_offset = 0;
}
void
meta_screen_cast_stream_src_set_empty_cursor_sprite_metadata (MetaScreenCastStreamSrc *src,
struct spa_meta_cursor *spa_meta_cursor,
int x,
int y)
{
struct spa_meta_bitmap *spa_meta_bitmap;
spa_meta_cursor->id = 1;
spa_meta_cursor->position.x = x;
spa_meta_cursor->position.y = y;
spa_meta_cursor->bitmap_offset = sizeof (struct spa_meta_cursor);
spa_meta_bitmap = SPA_MEMBER (spa_meta_cursor,
spa_meta_cursor->bitmap_offset,
struct spa_meta_bitmap);
spa_meta_bitmap->format = SPA_VIDEO_FORMAT_RGBA;
spa_meta_bitmap->offset = sizeof (struct spa_meta_bitmap);
spa_meta_cursor->hotspot.x = 0;
spa_meta_cursor->hotspot.y = 0;
*spa_meta_bitmap = (struct spa_meta_bitmap) { 0 };
}
void
meta_screen_cast_stream_src_set_cursor_sprite_metadata (MetaScreenCastStreamSrc *src,
struct spa_meta_cursor *spa_meta_cursor,
MetaCursorSprite *cursor_sprite,
int x,
int y,
float scale)
{
CoglTexture *cursor_texture;
struct spa_meta_bitmap *spa_meta_bitmap;
int hotspot_x, hotspot_y;
int texture_width, texture_height;
int bitmap_width, bitmap_height;
uint8_t *bitmap_data;
GError *error = NULL;
cursor_texture = meta_cursor_sprite_get_cogl_texture (cursor_sprite);
if (!cursor_texture)
{
meta_screen_cast_stream_src_set_empty_cursor_sprite_metadata (src,
spa_meta_cursor,
x, y);
return;
}
spa_meta_cursor->id = 1;
spa_meta_cursor->position.x = x;
spa_meta_cursor->position.y = y;
spa_meta_cursor->bitmap_offset = sizeof (struct spa_meta_cursor);
spa_meta_bitmap = SPA_MEMBER (spa_meta_cursor,
spa_meta_cursor->bitmap_offset,
struct spa_meta_bitmap);
spa_meta_bitmap->format = SPA_VIDEO_FORMAT_RGBA;
spa_meta_bitmap->offset = sizeof (struct spa_meta_bitmap);
meta_cursor_sprite_get_hotspot (cursor_sprite, &hotspot_x, &hotspot_y);
spa_meta_cursor->hotspot.x = (int32_t) roundf (hotspot_x * scale);
spa_meta_cursor->hotspot.y = (int32_t) roundf (hotspot_y * scale);
texture_width = cogl_texture_get_width (cursor_texture);
texture_height = cogl_texture_get_height (cursor_texture);
bitmap_width = texture_width * scale;
bitmap_height = texture_height * scale;
spa_meta_bitmap->size.width = bitmap_width;
spa_meta_bitmap->size.height = bitmap_height;
spa_meta_bitmap->stride = bitmap_width * 4;
bitmap_data = SPA_MEMBER (spa_meta_bitmap,
spa_meta_bitmap->offset,
uint8_t);
if (!meta_screen_cast_stream_src_draw_cursor_into (src,
cursor_texture,
scale,
bitmap_data,
&error))
{
g_warning ("Failed to draw cursor: %s", error->message);
g_error_free (error);
spa_meta_cursor->id = 0;
}
}
static void
add_cursor_metadata (MetaScreenCastStreamSrc *src,
struct spa_buffer *spa_buffer)
{
struct spa_meta_cursor *spa_meta_cursor;
spa_meta_cursor = spa_buffer_find_meta_data (spa_buffer, SPA_META_Cursor,
sizeof (*spa_meta_cursor));
if (spa_meta_cursor)
meta_screen_cast_stream_src_set_cursor_metadata (src, spa_meta_cursor);
}
static void
maybe_record_cursor (MetaScreenCastStreamSrc *src,
struct spa_buffer *spa_buffer)
{
MetaScreenCastStream *stream = meta_screen_cast_stream_src_get_stream (src);
switch (meta_screen_cast_stream_get_cursor_mode (stream))
{
case META_SCREEN_CAST_CURSOR_MODE_HIDDEN:
case META_SCREEN_CAST_CURSOR_MODE_EMBEDDED:
return;
case META_SCREEN_CAST_CURSOR_MODE_METADATA:
add_cursor_metadata (src, spa_buffer);
return;
}
g_assert_not_reached ();
}
static gboolean
do_record_frame (MetaScreenCastStreamSrc *src,
struct spa_buffer *spa_buffer,
uint8_t *data)
{
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
if (spa_buffer->datas[0].data ||
spa_buffer->datas[0].type == SPA_DATA_MemFd)
{
return meta_screen_cast_stream_src_record_frame (src, data);
}
else if (spa_buffer->datas[0].type == SPA_DATA_DmaBuf)
{
CoglDmaBufHandle *dmabuf_handle =
g_hash_table_lookup (priv->dmabuf_handles,
GINT_TO_POINTER (spa_buffer->datas[0].fd));
CoglFramebuffer *dmabuf_fbo =
cogl_dma_buf_handle_get_framebuffer (dmabuf_handle);
return meta_screen_cast_stream_src_blit_to_framebuffer (src, dmabuf_fbo);
}
return FALSE;
}
void
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;
uint8_t *data = NULL;
uint64_t now_us;
now_us = g_get_monotonic_time ();
if (priv->video_format.max_framerate.num > 0 &&
priv->last_frame_timestamp_us != 0 &&
(now_us - priv->last_frame_timestamp_us <
((1000000 * priv->video_format.max_framerate.denom) /
priv->video_format.max_framerate.num)))
return;
if (!priv->pipewire_stream)
return;
buffer = pw_stream_dequeue_buffer (priv->pipewire_stream);
if (!buffer)
return;
spa_buffer = buffer->buffer;
data = spa_buffer->datas[0].data;
if (spa_buffer->datas[0].type != SPA_DATA_DmaBuf && !data)
{
g_critical ("Invalid buffer data");
return;
}
if (do_record_frame (src, spa_buffer, data))
{
struct spa_meta_region *spa_meta_video_crop;
spa_buffer->datas[0].chunk->size = spa_buffer->datas[0].maxsize;
spa_buffer->datas[0].chunk->stride = priv->video_stride;
/* Update VideoCrop if needed */
spa_meta_video_crop =
spa_buffer_find_meta_data (spa_buffer, SPA_META_VideoCrop,
sizeof (*spa_meta_video_crop));
if (spa_meta_video_crop)
{
if (meta_screen_cast_stream_src_get_videocrop (src, &crop_rect))
{
spa_meta_video_crop->region.position.x = crop_rect.x;
spa_meta_video_crop->region.position.y = crop_rect.y;
spa_meta_video_crop->region.size.width = crop_rect.width;
spa_meta_video_crop->region.size.height = crop_rect.height;
}
else
{
spa_meta_video_crop->region.position.x = 0;
spa_meta_video_crop->region.position.y = 0;
spa_meta_video_crop->region.size.width = priv->stream_width;
spa_meta_video_crop->region.size.height = priv->stream_height;
}
}
}
else
{
spa_buffer->datas[0].chunk->size = 0;
}
maybe_record_cursor (src, spa_buffer);
priv->last_frame_timestamp_us = now_us;
pw_stream_queue_buffer (priv->pipewire_stream, buffer);
}
static gboolean
meta_screen_cast_stream_src_is_enabled (MetaScreenCastStreamSrc *src)
{
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
return priv->is_enabled;
}
static void
meta_screen_cast_stream_src_enable (MetaScreenCastStreamSrc *src)
{
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
META_SCREEN_CAST_STREAM_SRC_GET_CLASS (src)->enable (src);
priv->is_enabled = TRUE;
}
static void
meta_screen_cast_stream_src_disable (MetaScreenCastStreamSrc *src)
{
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
META_SCREEN_CAST_STREAM_SRC_GET_CLASS (src)->disable (src);
priv->is_enabled = FALSE;
}
static void
on_stream_state_changed (void *data,
enum pw_stream_state old,
enum pw_stream_state state,
const char *error_message)
{
MetaScreenCastStreamSrc *src = data;
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
switch (state)
{
case PW_STREAM_STATE_ERROR:
g_warning ("pipewire stream error: %s", error_message);
if (meta_screen_cast_stream_src_is_enabled (src))
meta_screen_cast_stream_src_disable (src);
priv->emit_closed_after_dispatch = TRUE;
break;
case PW_STREAM_STATE_PAUSED:
if (priv->node_id == SPA_ID_INVALID && priv->pipewire_stream)
{
priv->node_id = pw_stream_get_node_id (priv->pipewire_stream);
g_signal_emit (src, signals[READY], 0, (unsigned int) priv->node_id);
}
if (meta_screen_cast_stream_src_is_enabled (src))
meta_screen_cast_stream_src_disable (src);
break;
case PW_STREAM_STATE_STREAMING:
if (!meta_screen_cast_stream_src_is_enabled (src))
meta_screen_cast_stream_src_enable (src);
break;
case PW_STREAM_STATE_UNCONNECTED:
case PW_STREAM_STATE_CONNECTING:
break;
}
}
static void
on_stream_param_changed (void *data,
uint32_t id,
const struct spa_pod *format)
{
MetaScreenCastStreamSrc *src = data;
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
uint8_t params_buffer[1024];
int32_t width, height, stride, size;
struct spa_pod_builder pod_builder;
const struct spa_pod *params[3];
const int bpp = 4;
if (!format || id != SPA_PARAM_Format)
return;
spa_format_video_raw_parse (format,
&priv->video_format);
width = priv->video_format.size.width;
height = priv->video_format.size.height;
stride = SPA_ROUND_UP_N (width * bpp, 4);
size = height * stride;
priv->video_stride = stride;
pod_builder = SPA_POD_BUILDER_INIT (params_buffer, sizeof (params_buffer));
params[0] = spa_pod_builder_add_object (
&pod_builder,
SPA_TYPE_OBJECT_ParamBuffers, SPA_PARAM_Buffers,
SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int (16, 2, 16),
SPA_PARAM_BUFFERS_blocks, SPA_POD_Int (1),
SPA_PARAM_BUFFERS_size, SPA_POD_Int (size),
SPA_PARAM_BUFFERS_stride, SPA_POD_Int (stride),
SPA_PARAM_BUFFERS_align, SPA_POD_Int (16));
params[1] = spa_pod_builder_add_object (
&pod_builder,
SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
SPA_PARAM_META_type, SPA_POD_Id (SPA_META_VideoCrop),
SPA_PARAM_META_size, SPA_POD_Int (sizeof (struct spa_meta_region)));
params[2] = spa_pod_builder_add_object (
&pod_builder,
SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
SPA_PARAM_META_type, SPA_POD_Id (SPA_META_Cursor),
SPA_PARAM_META_size, SPA_POD_Int (CURSOR_META_SIZE (64, 64)));
pw_stream_update_params (priv->pipewire_stream, params, G_N_ELEMENTS (params));
}
static void
on_stream_add_buffer (void *data,
struct pw_buffer *buffer)
{
MetaScreenCastStreamSrc *src = data;
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
CoglContext *context =
clutter_backend_get_cogl_context (clutter_get_default_backend ());
CoglRenderer *renderer = cogl_context_get_renderer (context);
g_autoptr (GError) error = NULL;
CoglDmaBufHandle *dmabuf_handle;
struct spa_buffer *spa_buffer = buffer->buffer;
struct spa_data *spa_data = spa_buffer->datas;
const int bpp = 4;
int stride;
stride = SPA_ROUND_UP_N (priv->video_format.size.width * bpp, 4);
spa_data[0].mapoffset = 0;
spa_data[0].maxsize = stride * priv->video_format.size.height;
dmabuf_handle = cogl_renderer_create_dma_buf (renderer,
priv->stream_width,
priv->stream_height,
&error);
if (error)
g_debug ("Error exporting DMA buffer handle: %s", error->message);
if (dmabuf_handle)
{
spa_data[0].type = SPA_DATA_DmaBuf;
spa_data[0].flags = SPA_DATA_FLAG_READWRITE;
spa_data[0].fd = cogl_dma_buf_handle_get_fd (dmabuf_handle);
spa_data[0].data = NULL;
g_hash_table_insert (priv->dmabuf_handles,
GINT_TO_POINTER (spa_data[0].fd),
dmabuf_handle);
}
else
{
unsigned int seals;
/* Fallback to a memfd buffer */
spa_data[0].type = SPA_DATA_MemFd;
spa_data[0].flags = SPA_DATA_FLAG_READWRITE;
spa_data[0].fd = memfd_create ("mutter-screen-cast-memfd",
MFD_CLOEXEC | MFD_ALLOW_SEALING);
if (spa_data[0].fd == -1)
{
g_critical ("Can't create memfd: %m");
return;
}
spa_data[0].mapoffset = 0;
spa_data[0].maxsize = stride * priv->video_format.size.height;
if (ftruncate (spa_data[0].fd, spa_data[0].maxsize) < 0)
{
g_critical ("Can't truncate to %d: %m", spa_data[0].maxsize);
return;
}
seals = F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL;
if (fcntl (spa_data[0].fd, F_ADD_SEALS, seals) == -1)
g_warning ("Failed to add seals: %m");
spa_data[0].data = mmap (NULL,
spa_data[0].maxsize,
PROT_READ | PROT_WRITE,
MAP_SHARED,
spa_data[0].fd,
spa_data[0].mapoffset);
if (spa_data[0].data == MAP_FAILED)
{
g_critical ("Failed to mmap memory: %m");
return;
}
}
}
static void
on_stream_remove_buffer (void *data,
struct pw_buffer *buffer)
{
MetaScreenCastStreamSrc *src = data;
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
struct spa_buffer *spa_buffer = buffer->buffer;
struct spa_data *spa_data = spa_buffer->datas;
if (spa_data[0].type == SPA_DATA_DmaBuf)
{
if (!g_hash_table_remove (priv->dmabuf_handles, GINT_TO_POINTER (spa_data[0].fd)))
g_critical ("Failed to remove non-exported DMA buffer");
}
else if (spa_data[0].type == SPA_DATA_MemFd)
{
munmap (spa_data[0].data, spa_data[0].maxsize);
close (spa_data[0].fd);
}
}
static const struct pw_stream_events stream_events = {
PW_VERSION_STREAM_EVENTS,
.state_changed = on_stream_state_changed,
.param_changed = on_stream_param_changed,
.add_buffer = on_stream_add_buffer,
.remove_buffer = on_stream_remove_buffer,
};
static struct pw_stream *
create_pipewire_stream (MetaScreenCastStreamSrc *src,
GError **error)
{
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
struct pw_stream *pipewire_stream;
uint8_t buffer[1024];
struct spa_pod_builder pod_builder =
SPA_POD_BUILDER_INIT (buffer, sizeof (buffer));
float frame_rate;
MetaFraction frame_rate_fraction;
struct spa_fraction max_framerate;
struct spa_fraction min_framerate;
const struct spa_pod *params[1];
int result;
priv->node_id = SPA_ID_INVALID;
pipewire_stream = pw_stream_new (priv->pipewire_core,
"meta-screen-cast-src",
NULL);
if (!pipewire_stream)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Failed to create PipeWire stream: %s",
strerror (errno));
return NULL;
}
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);
max_framerate = SPA_FRACTION (frame_rate_fraction.num,
frame_rate_fraction.denom);
params[0] = spa_pod_builder_add_object (
&pod_builder,
SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
SPA_FORMAT_mediaType, SPA_POD_Id (SPA_MEDIA_TYPE_video),
SPA_FORMAT_mediaSubtype, SPA_POD_Id (SPA_MEDIA_SUBTYPE_raw),
SPA_FORMAT_VIDEO_format, SPA_POD_Id (SPA_VIDEO_FORMAT_BGRx),
SPA_FORMAT_VIDEO_size, SPA_POD_Rectangle (&SPA_RECTANGLE (priv->stream_width,
priv->stream_height)),
SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction (&SPA_FRACTION (0, 1)),
SPA_FORMAT_VIDEO_maxFramerate, SPA_POD_CHOICE_RANGE_Fraction (&max_framerate,
&min_framerate,
&max_framerate));
pw_stream_add_listener (pipewire_stream,
&priv->pipewire_stream_listener,
&stream_events,
src);
result = pw_stream_connect (pipewire_stream,
PW_DIRECTION_OUTPUT,
SPA_ID_INVALID,
(PW_STREAM_FLAG_DRIVER |
PW_STREAM_FLAG_ALLOC_BUFFERS),
params, G_N_ELEMENTS (params));
if (result != 0)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Could not connect: %s", spa_strerror (result));
return NULL;
}
return pipewire_stream;
}
static void
on_core_error (void *data,
uint32_t id,
int seq,
int res,
const char *message)
{
MetaScreenCastStreamSrc *src = data;
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
g_warning ("pipewire remote error: id:%u %s", id, message);
if (id == PW_ID_CORE && res == -EPIPE)
{
if (meta_screen_cast_stream_src_is_enabled (src))
meta_screen_cast_stream_src_disable (src);
priv->emit_closed_after_dispatch = TRUE;
}
}
static gboolean
pipewire_loop_source_prepare (GSource *base,
int *timeout)
{
*timeout = -1;
return FALSE;
}
static gboolean
pipewire_loop_source_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
MetaPipeWireSource *pipewire_source = (MetaPipeWireSource *) source;
MetaScreenCastStreamSrc *src = pipewire_source->src;
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
int result;
result = pw_loop_iterate (pipewire_source->pipewire_loop, 0);
if (result < 0)
g_warning ("pipewire_loop_iterate failed: %s", spa_strerror (result));
if (priv->emit_closed_after_dispatch)
g_signal_emit (src, signals[CLOSED], 0);
return TRUE;
}
static void
pipewire_loop_source_finalize (GSource *source)
{
MetaPipeWireSource *pipewire_source = (MetaPipeWireSource *) source;
pw_loop_leave (pipewire_source->pipewire_loop);
pw_loop_destroy (pipewire_source->pipewire_loop);
}
static GSourceFuncs pipewire_source_funcs =
{
pipewire_loop_source_prepare,
NULL,
pipewire_loop_source_dispatch,
pipewire_loop_source_finalize
};
static MetaPipeWireSource *
create_pipewire_source (MetaScreenCastStreamSrc *src)
{
MetaPipeWireSource *pipewire_source;
pipewire_source =
(MetaPipeWireSource *) g_source_new (&pipewire_source_funcs,
sizeof (MetaPipeWireSource));
pipewire_source->src = src;
pipewire_source->pipewire_loop = pw_loop_new (NULL);
if (!pipewire_source->pipewire_loop)
{
g_source_unref ((GSource *) pipewire_source);
return NULL;
}
g_source_add_unix_fd (&pipewire_source->base,
pw_loop_get_fd (pipewire_source->pipewire_loop),
G_IO_IN | G_IO_ERR);
pw_loop_enter (pipewire_source->pipewire_loop);
g_source_attach (&pipewire_source->base, NULL);
return pipewire_source;
}
static const struct pw_core_events core_events = {
PW_VERSION_CORE_EVENTS,
.error = on_core_error,
};
static gboolean
meta_screen_cast_stream_src_initable_init (GInitable *initable,
GCancellable *cancellable,
GError **error)
{
MetaScreenCastStreamSrc *src = META_SCREEN_CAST_STREAM_SRC (initable);
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
priv->pipewire_source = create_pipewire_source (src);
if (!priv->pipewire_source)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Failed to create PipeWire source");
return FALSE;
}
priv->pipewire_context = pw_context_new (priv->pipewire_source->pipewire_loop,
NULL, 0);
if (!priv->pipewire_context)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Failed to create pipewire context");
return FALSE;
}
priv->pipewire_core = pw_context_connect (priv->pipewire_context, NULL, 0);
if (!priv->pipewire_core)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Couldn't connect pipewire context");
return FALSE;
}
pw_core_add_listener (priv->pipewire_core,
&priv->pipewire_core_listener,
&core_events,
src);
priv->pipewire_stream = create_pipewire_stream (src, error);
if (!priv->pipewire_stream)
return FALSE;
return TRUE;
}
static void
meta_screen_cast_stream_src_init_initable_iface (GInitableIface *iface)
{
iface->init = meta_screen_cast_stream_src_initable_init;
}
int
meta_screen_cast_stream_src_get_stride (MetaScreenCastStreamSrc *src)
{
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
return priv->video_stride;
}
MetaScreenCastStream *
meta_screen_cast_stream_src_get_stream (MetaScreenCastStreamSrc *src)
{
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
return priv->stream;
}
static void
meta_screen_cast_stream_src_finalize (GObject *object)
{
MetaScreenCastStreamSrc *src = META_SCREEN_CAST_STREAM_SRC (object);
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
if (meta_screen_cast_stream_src_is_enabled (src))
meta_screen_cast_stream_src_disable (src);
g_clear_pointer (&priv->dmabuf_handles, g_hash_table_destroy);
g_clear_pointer (&priv->pipewire_stream, pw_stream_destroy);
g_clear_pointer (&priv->pipewire_core, pw_core_disconnect);
g_clear_pointer (&priv->pipewire_context, pw_context_destroy);
g_source_destroy (&priv->pipewire_source->base);
g_source_unref (&priv->pipewire_source->base);
G_OBJECT_CLASS (meta_screen_cast_stream_src_parent_class)->finalize (object);
}
static void
meta_screen_cast_stream_src_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
MetaScreenCastStreamSrc *src = META_SCREEN_CAST_STREAM_SRC (object);
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
switch (prop_id)
{
case PROP_STREAM:
priv->stream = g_value_get_object (value);
break;;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
meta_screen_cast_stream_src_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
MetaScreenCastStreamSrc *src = META_SCREEN_CAST_STREAM_SRC (object);
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
switch (prop_id)
{
case PROP_STREAM:
g_value_set_object (value, priv->stream);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
meta_screen_cast_stream_src_init (MetaScreenCastStreamSrc *src)
{
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
priv->dmabuf_handles =
g_hash_table_new_full (NULL, NULL, NULL,
(GDestroyNotify) cogl_dma_buf_handle_free);
}
static void
meta_screen_cast_stream_src_class_init (MetaScreenCastStreamSrcClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = meta_screen_cast_stream_src_finalize;
object_class->set_property = meta_screen_cast_stream_src_set_property;
object_class->get_property = meta_screen_cast_stream_src_get_property;
g_object_class_install_property (object_class,
PROP_STREAM,
g_param_spec_object ("stream",
"stream",
"MetaScreenCastStream",
META_TYPE_SCREEN_CAST_STREAM,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
signals[READY] = g_signal_new ("ready",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_NONE, 1,
G_TYPE_UINT);
signals[CLOSED] = g_signal_new ("closed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_NONE, 0);
}
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