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gnome-shell/src/shell-recorder.c
Rui Matos 2a7f9f70b8 shell-recorder: Avoid a crash when the cursor texture is NULL 
When running as a wayland compositor, MetaCursorTracker might
legitimately not have a displayed cursor because e.g. a client unsets
the cursor surface.

Note that, under an X session, the assumption that the tracker always
has a cursor texture is true because XFixesGetCursorImage() always
returns data even if the cursor isn't visible.

https://bugzilla.gnome.org/show_bug.cgi?id=767001
2016-06-28 19:03:33 +02:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
#include "config.h"
#include <fcntl.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define GST_USE_UNSTABLE_API
#include <gst/gst.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <cogl/cogl.h>
#include <meta/screen.h>
#include <meta/meta-cursor-tracker.h>
#include <meta/compositor-mutter.h>
#include "shell-global.h"
#include "shell-recorder-src.h"
#include "shell-recorder.h"
#define A11Y_APPS_SCHEMA "org.gnome.desktop.a11y.applications"
#define MAGNIFIER_ACTIVE_KEY "screen-magnifier-enabled"
typedef enum {
RECORDER_STATE_CLOSED,
RECORDER_STATE_RECORDING
} RecorderState;
typedef struct _RecorderPipeline RecorderPipeline;
struct _ShellRecorder {
GObject parent;
/* A "maximum" amount of memory to use for buffering. This is used
* to alert the user that they are filling up memory rather than
* any that actually affects recording. (In kB)
*/
guint memory_target;
guint memory_used; /* Current memory used. (In kB) */
RecorderState state;
ClutterStage *stage;
gboolean custom_area;
cairo_rectangle_int_t area;
int stage_width;
int stage_height;
GdkScreen *gdk_screen;
int pointer_x;
int pointer_y;
GSettings *a11y_settings;
gboolean draw_cursor;
MetaCursorTracker *cursor_tracker;
cairo_surface_t *cursor_image;
guint8 *cursor_memory;
int cursor_hot_x;
int cursor_hot_y;
int framerate;
char *pipeline_description;
char *file_template;
/* We might have multiple pipelines that are finishing encoding
* to go along with the current pipeline where we are recording.
*/
RecorderPipeline *current_pipeline; /* current pipeline */
GSList *pipelines; /* all pipelines */
GstClockTime last_frame_time; /* Timestamp for the last frame */
/* GSource IDs for different timeouts and idles */
guint redraw_timeout;
guint redraw_idle;
guint update_memory_used_timeout;
guint update_pointer_timeout;
guint repaint_hook_id;
};
struct _RecorderPipeline
{
ShellRecorder *recorder;
GstElement *pipeline;
GstElement *src;
int outfile;
char *filename;
};
static void recorder_set_stage (ShellRecorder *recorder,
ClutterStage *stage);
static void recorder_set_framerate (ShellRecorder *recorder,
int framerate);
static void recorder_set_pipeline (ShellRecorder *recorder,
const char *pipeline);
static void recorder_set_file_template (ShellRecorder *recorder,
const char *file_template);
static void recorder_set_draw_cursor (ShellRecorder *recorder,
gboolean draw_cursor);
static void recorder_pipeline_set_caps (RecorderPipeline *pipeline);
static void recorder_pipeline_closed (RecorderPipeline *pipeline);
static void recorder_remove_redraw_timeout (ShellRecorder *recorder);
enum {
PROP_0,
PROP_SCREEN,
PROP_STAGE,
PROP_FRAMERATE,
PROP_PIPELINE,
PROP_FILE_TEMPLATE,
PROP_DRAW_CURSOR
};
G_DEFINE_TYPE(ShellRecorder, shell_recorder, G_TYPE_OBJECT);
/* The default value of the target frame rate; we'll never record more
* than this many frames per second, though we may record less if the
* screen isn't being redrawn. 30 is a compromise between smoothness
* and the size of the recording.
*/
#define DEFAULT_FRAMES_PER_SECOND 30
/* The time (in milliseconds) between querying the server for the cursor
* position.
*/
#define UPDATE_POINTER_TIME 100
/* The time we wait (in milliseconds) before redrawing when the memory used
* changes.
*/
#define UPDATE_MEMORY_USED_DELAY 500
/* Maximum time between frames, in milliseconds. If we don't send data
* for a long period of time, then when we send the next frame, a lot
* of work can be created for the encoder to do, so we want to force a
* periodic redraw when nothing happen.
*/
#define MAXIMUM_PAUSE_TIME 1000
/* The default pipeline.
*/
#define DEFAULT_PIPELINE "vp9enc min_quantizer=13 max_quantizer=13 cpu-used=5 deadline=1000000 threads=%T ! queue ! webmmux"
/* If we can find the amount of memory on the machine, we use half
* of that for memory_target, otherwise, we use this value, in kB.
*/
#define DEFAULT_MEMORY_TARGET (512*1024)
static guint
get_memory_target (void)
{
FILE *f;
/* Really simple "get amount of memory on the machine" if it
* doesn't work, you just get the default memory target.
*/
f = fopen("/proc/meminfo", "r");
if (!f)
return DEFAULT_MEMORY_TARGET;
while (!feof(f))
{
gchar line_buffer[1024];
guint mem_total;
if (fscanf(f, "MemTotal: %u", &mem_total) == 1)
{
fclose(f);
return mem_total / 2;
}
/* Skip to the next line and discard what we read */
if (fgets(line_buffer, sizeof(line_buffer), f) == NULL)
break;
}
fclose(f);
return DEFAULT_MEMORY_TARGET;
}
/*
* Used to force full stage redraws during recording to avoid artifacts
*
* Note: That this will cause the stage to be repainted on
* every animation frame even if the frame wouldn't normally cause any new
* drawing
*/
static gboolean
recorder_repaint_hook (gpointer data)
{
ClutterActor *stage = data;
clutter_actor_queue_redraw (stage);
return TRUE;
}
static void
shell_recorder_init (ShellRecorder *recorder)
{
/* Calling gst_init() is a no-op if GStreamer was previously initialized */
gst_init (NULL, NULL);
shell_recorder_src_register ();
recorder->gdk_screen = gdk_screen_get_default ();
recorder->memory_target = get_memory_target();
recorder->a11y_settings = g_settings_new (A11Y_APPS_SCHEMA);
recorder->state = RECORDER_STATE_CLOSED;
recorder->framerate = DEFAULT_FRAMES_PER_SECOND;
recorder->draw_cursor = TRUE;
}
static void
shell_recorder_finalize (GObject *object)
{
ShellRecorder *recorder = SHELL_RECORDER (object);
if (recorder->update_memory_used_timeout)
g_source_remove (recorder->update_memory_used_timeout);
if (recorder->cursor_image)
cairo_surface_destroy (recorder->cursor_image);
if (recorder->cursor_memory)
g_free (recorder->cursor_memory);
recorder_set_stage (recorder, NULL);
recorder_set_pipeline (recorder, NULL);
recorder_set_file_template (recorder, NULL);
recorder_remove_redraw_timeout (recorder);
g_clear_object (&recorder->a11y_settings);
G_OBJECT_CLASS (shell_recorder_parent_class)->finalize (object);
}
static void
recorder_on_stage_destroy (ClutterActor *actor,
ShellRecorder *recorder)
{
recorder_set_stage (recorder, NULL);
}
/* Add together the memory used by all pipelines; both the
* currently recording pipeline and pipelines finishing
* recording asynchronously.
*/
static void
recorder_update_memory_used (ShellRecorder *recorder,
gboolean repaint)
{
guint memory_used = 0;
GSList *l;
for (l = recorder->pipelines; l; l = l->next)
{
RecorderPipeline *pipeline = l->data;
guint pipeline_memory_used;
g_object_get (pipeline->src,
"memory-used", &pipeline_memory_used,
NULL);
memory_used += pipeline_memory_used;
}
if (memory_used != recorder->memory_used)
recorder->memory_used = memory_used;
}
/* Timeout used to avoid not drawing for more than MAXIMUM_PAUSE_TIME
*/
static gboolean
recorder_redraw_timeout (gpointer data)
{
ShellRecorder *recorder = data;
recorder->redraw_timeout = 0;
clutter_actor_queue_redraw (CLUTTER_ACTOR (recorder->stage));
return FALSE;
}
static void
recorder_add_redraw_timeout (ShellRecorder *recorder)
{
if (recorder->redraw_timeout == 0)
{
recorder->redraw_timeout = g_timeout_add (MAXIMUM_PAUSE_TIME,
recorder_redraw_timeout,
recorder);
g_source_set_name_by_id (recorder->redraw_timeout, "[gnome-shell] recorder_redraw_timeout");
}
}
static void
recorder_remove_redraw_timeout (ShellRecorder *recorder)
{
if (recorder->redraw_timeout != 0)
{
g_source_remove (recorder->redraw_timeout);
recorder->redraw_timeout = 0;
}
}
static void
recorder_fetch_cursor_image (ShellRecorder *recorder)
{
CoglTexture *texture;
int width, height;
int stride;
guint8 *data;
texture = meta_cursor_tracker_get_sprite (recorder->cursor_tracker);
if (!texture)
return;
width = cogl_texture_get_width (texture);
height = cogl_texture_get_height (texture);
stride = 4 * width;
data = g_new (guint8, stride * height);
cogl_texture_get_data (texture, CLUTTER_CAIRO_FORMAT_ARGB32, stride, data);
/* FIXME: cairo-gl? */
recorder->cursor_image = cairo_image_surface_create_for_data (data,
CAIRO_FORMAT_ARGB32,
width, height,
stride);
recorder->cursor_memory = data;
}
/* Overlay the cursor image on the frame. We draw the cursor image
* into the host-memory buffer after we've captured the frame. An
* alternate approach would be to turn off the cursor while recording
* and draw the cursor ourselves with GL, but then we'd need to figure
* out what the cursor looks like, or hard-code a non-system cursor.
*/
static void
recorder_draw_cursor (ShellRecorder *recorder,
GstBuffer *buffer)
{
GstMapInfo info;
cairo_surface_t *surface;
cairo_t *cr;
/* We don't show a cursor unless the hot spot is in the frame; this
* means that sometimes we aren't going to draw a cursor even when
* there is a little bit overlapping within the stage */
if (recorder->pointer_x < recorder->area.x ||
recorder->pointer_y < recorder->area.y ||
recorder->pointer_x >= recorder->area.x + recorder->area.width ||
recorder->pointer_y >= recorder->area.y + recorder->area.height)
return;
if (!recorder->cursor_image)
recorder_fetch_cursor_image (recorder);
if (!recorder->cursor_image)
return;
gst_buffer_map (buffer, &info, GST_MAP_WRITE);
surface = cairo_image_surface_create_for_data (info.data,
CAIRO_FORMAT_ARGB32,
recorder->area.width,
recorder->area.height,
recorder->area.width * 4);
cr = cairo_create (surface);
cairo_set_source_surface (cr,
recorder->cursor_image,
recorder->pointer_x - recorder->cursor_hot_x - recorder->area.x,
recorder->pointer_y - recorder->cursor_hot_y - recorder->area.y);
cairo_paint (cr);
cairo_destroy (cr);
cairo_surface_destroy (surface);
gst_buffer_unmap (buffer, &info);
}
/* Retrieve a frame and feed it into the pipeline
*/
static void
recorder_record_frame (ShellRecorder *recorder)
{
GstBuffer *buffer;
guint8 *data;
guint size;
GstClock *clock;
GstClockTime now, base_time;
g_return_if_fail (recorder->current_pipeline != NULL);
/* If we get into the red zone, stop buffering new frames; 13/16 is
* a bit more than the 3/4 threshold for a red indicator to keep the
* indicator from flashing between red and yellow. */
if (recorder->memory_used > (recorder->memory_target * 13) / 16)
return;
/* Drop frames to get down to something like the target frame rate; since frames
* are generated with VBlank sync, we don't have full control anyways, so we just
* drop frames if the interval since the last frame is less than 75% of the
* desired inter-frame interval.
*/
clock = gst_element_get_clock (recorder->current_pipeline->src);
/* If we have no clock yet, the pipeline is not yet in PLAYING */
if (!clock)
return;
base_time = gst_element_get_base_time (recorder->current_pipeline->src);
now = gst_clock_get_time (clock) - base_time;
gst_object_unref (clock);
if (GST_CLOCK_TIME_IS_VALID (recorder->last_frame_time) &&
now - recorder->last_frame_time < gst_util_uint64_scale_int (GST_SECOND, 3, 4 * recorder->framerate))
return;
recorder->last_frame_time = now;
size = recorder->area.width * recorder->area.height * 4;
data = g_malloc (size);
cogl_framebuffer_read_pixels (cogl_get_draw_framebuffer (),
recorder->area.x,
recorder->area.y,
recorder->area.width,
recorder->area.height,
CLUTTER_CAIRO_FORMAT_ARGB32,
data);
buffer = gst_buffer_new();
gst_buffer_insert_memory (buffer, -1,
gst_memory_new_wrapped (0, data, size, 0,
size, data, g_free));
GST_BUFFER_PTS(buffer) = now;
if (recorder->draw_cursor &&
!g_settings_get_boolean (recorder->a11y_settings, MAGNIFIER_ACTIVE_KEY))
recorder_draw_cursor (recorder, buffer);
shell_recorder_src_add_buffer (SHELL_RECORDER_SRC (recorder->current_pipeline->src), buffer);
gst_buffer_unref (buffer);
/* Reset the timeout that we used to avoid an overlong pause in the stream */
recorder_remove_redraw_timeout (recorder);
recorder_add_redraw_timeout (recorder);
}
/* We hook in by recording each frame right after the stage is painted
* by clutter before glSwapBuffers() makes it visible to the user.
*/
static void
recorder_on_stage_paint (ClutterActor *actor,
ShellRecorder *recorder)
{
if (recorder->state == RECORDER_STATE_RECORDING)
recorder_record_frame (recorder);
}
static void
recorder_update_size (ShellRecorder *recorder)
{
ClutterActorBox allocation;
clutter_actor_get_allocation_box (CLUTTER_ACTOR (recorder->stage), &allocation);
recorder->stage_width = (int)(0.5 + allocation.x2 - allocation.x1);
recorder->stage_height = (int)(0.5 + allocation.y2 - allocation.y1);
if (!recorder->custom_area)
{
recorder->area.x = 0;
recorder->area.y = 0;
recorder->area.width = recorder->stage_width;
recorder->area.height = recorder->stage_height;
}
}
static void
recorder_on_stage_notify_size (GObject *object,
GParamSpec *pspec,
ShellRecorder *recorder)
{
recorder_update_size (recorder);
/* This breaks the recording but tweaking the GStreamer pipeline a bit
* might make it work, at least if the codec can handle a stream where
* the frame size changes in the middle.
*/
if (recorder->current_pipeline)
recorder_pipeline_set_caps (recorder->current_pipeline);
}
static gboolean
recorder_idle_redraw (gpointer data)
{
ShellRecorder *recorder = data;
recorder->redraw_idle = 0;
clutter_actor_queue_redraw (CLUTTER_ACTOR (recorder->stage));
return FALSE;
}
static void
recorder_queue_redraw (ShellRecorder *recorder)
{
/* If we just queue a redraw on every mouse motion (for example), we
* starve Clutter, which operates at a very low priority. So
* we need to queue a "low priority redraw" after timeline updates
*/
if (recorder->state == RECORDER_STATE_RECORDING && recorder->redraw_idle == 0)
{
recorder->redraw_idle = g_idle_add_full (CLUTTER_PRIORITY_REDRAW + 1,
recorder_idle_redraw, recorder, NULL);
g_source_set_name_by_id (recorder->redraw_idle, "[gnome-shell] recorder_idle_redraw");
}
}
static void
on_cursor_changed (MetaCursorTracker *tracker,
ShellRecorder *recorder)
{
if (recorder->cursor_image)
{
cairo_surface_destroy (recorder->cursor_image);
recorder->cursor_image = NULL;
}
if (recorder->cursor_memory)
{
g_free (recorder->cursor_memory);
recorder->cursor_memory = NULL;
}
recorder_queue_redraw (recorder);
}
static void
recorder_update_pointer (ShellRecorder *recorder)
{
int pointer_x, pointer_y;
meta_cursor_tracker_get_pointer (recorder->cursor_tracker, &pointer_x, &pointer_y, NULL);
if (pointer_x != recorder->pointer_x || pointer_y != recorder->pointer_y)
{
recorder->pointer_x = pointer_x;
recorder->pointer_y = pointer_y;
recorder_queue_redraw (recorder);
}
}
static gboolean
recorder_update_pointer_timeout (gpointer data)
{
recorder_update_pointer (data);
return TRUE;
}
static void
recorder_add_update_pointer_timeout (ShellRecorder *recorder)
{
if (!recorder->update_pointer_timeout)
{
recorder->update_pointer_timeout = g_timeout_add (UPDATE_POINTER_TIME,
recorder_update_pointer_timeout,
recorder);
g_source_set_name_by_id (recorder->update_pointer_timeout, "[gnome-shell] recorder_update_pointer_timeout");
}
}
static void
recorder_remove_update_pointer_timeout (ShellRecorder *recorder)
{
if (recorder->update_pointer_timeout)
{
g_source_remove (recorder->update_pointer_timeout);
recorder->update_pointer_timeout = 0;
}
}
static void
recorder_connect_stage_callbacks (ShellRecorder *recorder)
{
g_signal_connect (recorder->stage, "destroy",
G_CALLBACK (recorder_on_stage_destroy), recorder);
g_signal_connect_after (recorder->stage, "paint",
G_CALLBACK (recorder_on_stage_paint), recorder);
g_signal_connect (recorder->stage, "notify::width",
G_CALLBACK (recorder_on_stage_notify_size), recorder);
g_signal_connect (recorder->stage, "notify::height",
G_CALLBACK (recorder_on_stage_notify_size), recorder);
}
static void
recorder_disconnect_stage_callbacks (ShellRecorder *recorder)
{
g_signal_handlers_disconnect_by_func (recorder->stage,
(void *)recorder_on_stage_destroy,
recorder);
g_signal_handlers_disconnect_by_func (recorder->stage,
(void *)recorder_on_stage_paint,
recorder);
g_signal_handlers_disconnect_by_func (recorder->stage,
(void *)recorder_on_stage_notify_size,
recorder);
/* We don't don't deselect for cursor changes in case someone else just
* happened to be selecting for cursor events on the same window; sending
* us the events is close to free in any case.
*/
if (recorder->redraw_idle)
{
g_source_remove (recorder->redraw_idle);
recorder->redraw_idle = 0;
}
}
static void
recorder_set_stage (ShellRecorder *recorder,
ClutterStage *stage)
{
if (recorder->stage == stage)
return;
if (recorder->current_pipeline)
shell_recorder_close (recorder);
if (recorder->stage)
recorder_disconnect_stage_callbacks (recorder);
recorder->stage = stage;
if (recorder->stage)
recorder_update_size (recorder);
}
static void
recorder_set_screen (ShellRecorder *recorder,
MetaScreen *screen)
{
MetaCursorTracker *tracker;
tracker = meta_cursor_tracker_get_for_screen (screen);
if (tracker == recorder->cursor_tracker)
return;
recorder->cursor_tracker = tracker;
g_signal_connect_object (tracker, "cursor-changed",
G_CALLBACK (on_cursor_changed), recorder, 0);
}
static void
recorder_set_framerate (ShellRecorder *recorder,
int framerate)
{
if (framerate == recorder->framerate)
return;
if (recorder->current_pipeline)
shell_recorder_close (recorder);
recorder->framerate = framerate;
g_object_notify (G_OBJECT (recorder), "framerate");
}
static void
recorder_set_pipeline (ShellRecorder *recorder,
const char *pipeline)
{
if (pipeline == recorder->pipeline_description ||
(pipeline && recorder->pipeline_description && strcmp (recorder->pipeline_description, pipeline) == 0))
return;
if (recorder->current_pipeline)
shell_recorder_close (recorder);
if (recorder->pipeline_description)
g_free (recorder->pipeline_description);
recorder->pipeline_description = g_strdup (pipeline);
g_object_notify (G_OBJECT (recorder), "pipeline");
}
static void
recorder_set_file_template (ShellRecorder *recorder,
const char *file_template)
{
if (file_template == recorder->file_template ||
(file_template && recorder->file_template && strcmp (recorder->file_template, file_template) == 0))
return;
if (recorder->current_pipeline)
shell_recorder_close (recorder);
if (recorder->file_template)
g_free (recorder->file_template);
recorder->file_template = g_strdup (file_template);
g_object_notify (G_OBJECT (recorder), "file-template");
}
static void
recorder_set_draw_cursor (ShellRecorder *recorder,
gboolean draw_cursor)
{
if (draw_cursor == recorder->draw_cursor)
return;
recorder->draw_cursor = draw_cursor;
g_object_notify (G_OBJECT (recorder), "draw-cursor");
}
static void
shell_recorder_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ShellRecorder *recorder = SHELL_RECORDER (object);
switch (prop_id)
{
case PROP_SCREEN:
recorder_set_screen (recorder, g_value_get_object (value));
break;
case PROP_STAGE:
recorder_set_stage (recorder, g_value_get_object (value));
break;
case PROP_FRAMERATE:
recorder_set_framerate (recorder, g_value_get_int (value));
break;
case PROP_PIPELINE:
recorder_set_pipeline (recorder, g_value_get_string (value));
break;
case PROP_FILE_TEMPLATE:
recorder_set_file_template (recorder, g_value_get_string (value));
break;
case PROP_DRAW_CURSOR:
recorder_set_draw_cursor (recorder, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
shell_recorder_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ShellRecorder *recorder = SHELL_RECORDER (object);
switch (prop_id)
{
case PROP_STAGE:
g_value_set_object (value, G_OBJECT (recorder->stage));
break;
case PROP_FRAMERATE:
g_value_set_int (value, recorder->framerate);
break;
case PROP_PIPELINE:
g_value_set_string (value, recorder->pipeline_description);
break;
case PROP_FILE_TEMPLATE:
g_value_set_string (value, recorder->file_template);
break;
case PROP_DRAW_CURSOR:
g_value_set_boolean (value, recorder->draw_cursor);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
shell_recorder_class_init (ShellRecorderClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = shell_recorder_finalize;
gobject_class->get_property = shell_recorder_get_property;
gobject_class->set_property = shell_recorder_set_property;
g_object_class_install_property (gobject_class,
PROP_SCREEN,
g_param_spec_object ("screen",
"Screen",
"Screen to record",
META_TYPE_SCREEN,
G_PARAM_WRITABLE));
g_object_class_install_property (gobject_class,
PROP_STAGE,
g_param_spec_object ("stage",
"Stage",
"Stage to record",
CLUTTER_TYPE_STAGE,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_FRAMERATE,
g_param_spec_int ("framerate",
"Framerate",
"Framerate used for resulting video in frames-per-second",
0,
G_MAXINT,
DEFAULT_FRAMES_PER_SECOND,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_PIPELINE,
g_param_spec_string ("pipeline",
"Pipeline",
"GStreamer pipeline description to encode recordings",
NULL,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_FILE_TEMPLATE,
g_param_spec_string ("file-template",
"File Template",
"The filename template to use for output files",
NULL,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_DRAW_CURSOR,
g_param_spec_boolean ("draw-cursor",
"Draw Cursor",
"Whether to record the cursor",
TRUE,
G_PARAM_READWRITE));
}
/* Sets the GstCaps (video format, in this case) on the stream
*/
static void
recorder_pipeline_set_caps (RecorderPipeline *pipeline)
{
GstCaps *caps;
/* The data is always native-endian xRGB; videoconvert
* doesn't support little-endian xRGB, but does support
* big-endian BGRx.
*/
caps = gst_caps_new_simple ("video/x-raw",
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
"format", G_TYPE_STRING, "BGRx",
#else
"format", G_TYPE_STRING, "xRGB",
#endif
"framerate", GST_TYPE_FRACTION, pipeline->recorder->framerate, 1,
"width", G_TYPE_INT, pipeline->recorder->area.width,
"height", G_TYPE_INT, pipeline->recorder->area.height,
NULL);
g_object_set (pipeline->src, "caps", caps, NULL);
gst_caps_unref (caps);
}
/* Augments the supplied pipeline with the source elements: the actual
* ShellRecorderSrc element where we inject frames then additional elements
* to convert the output into something palatable.
*/
static gboolean
recorder_pipeline_add_source (RecorderPipeline *pipeline)
{
GstPad *sink_pad = NULL, *src_pad = NULL;
gboolean result = FALSE;
GstElement *videoconvert;
sink_pad = gst_bin_find_unlinked_pad (GST_BIN (pipeline->pipeline), GST_PAD_SINK);
if (sink_pad == NULL)
{
g_warning("ShellRecorder: pipeline has no unlinked sink pad");
goto out;
}
pipeline->src = gst_element_factory_make ("shellrecordersrc", NULL);
if (pipeline->src == NULL)
{
g_warning ("Can't create recorder source element");
goto out;
}
gst_bin_add (GST_BIN (pipeline->pipeline), pipeline->src);
recorder_pipeline_set_caps (pipeline);
/* The videoconvert element is a generic converter; it will convert
* our supplied fixed format data into whatever the encoder wants
*/
videoconvert = gst_element_factory_make ("videoconvert", NULL);
if (!videoconvert)
{
g_warning("Can't create videoconvert element");
goto out;
}
gst_bin_add (GST_BIN (pipeline->pipeline), videoconvert);
gst_element_link_many (pipeline->src, videoconvert, NULL);
src_pad = gst_element_get_static_pad (videoconvert, "src");
if (!src_pad)
{
g_warning("ShellRecorder: can't get src pad to link into pipeline");
goto out;
}
if (gst_pad_link (src_pad, sink_pad) != GST_PAD_LINK_OK)
{
g_warning("ShellRecorder: can't link to sink pad");
goto out;
}
result = TRUE;
out:
if (sink_pad)
gst_object_unref (sink_pad);
if (src_pad)
gst_object_unref (src_pad);
return result;
}
static char *
get_absolute_path (char *maybe_relative)
{
char *path;
if (g_path_is_absolute (maybe_relative))
path = g_strdup (maybe_relative);
else
{
const char *video_dir = g_get_user_special_dir (G_USER_DIRECTORY_VIDEOS);
if (!g_file_test (video_dir, G_FILE_TEST_EXISTS))
video_dir = g_get_home_dir ();
path = g_build_filename (video_dir, maybe_relative, NULL);
}
return path;
}
/* Open a file for writing. Opening the file ourselves and using fdsink has
* the advantage over filesink of being able to use O_EXCL when we want to
* avoid overwriting* an existing file. Returns -1 if the file couldn't
* be opened.
*/
static int
recorder_open_outfile (ShellRecorder *recorder,
char **outfilename)
{
const char *pattern;
int flags;
int outfile = -1;
pattern = recorder->file_template;
if (!pattern)
return -1;
while (TRUE)
{
GString *filename = g_string_new (NULL);
const char *p;
char *path;
for (p = pattern; *p; p++)
{
if (*p == '%')
{
switch (*(p + 1))
{
case '%':
case '\0':
g_string_append_c (filename, '%');
break;
case 'd':
{
/* Appends date according to locale */
GDateTime *datetime = g_date_time_new_now_local ();
char *date_str = g_date_time_format (datetime, "%0x");
char *s;
for (s = date_str; *s; s++)
if (G_IS_DIR_SEPARATOR (*s))
*s = '-';
g_string_append (filename, date_str);
g_free (date_str);
g_date_time_unref (datetime);
}
break;
case 't':
{
/* Appends time according to locale */
GDateTime *datetime = g_date_time_new_now_local ();
char *time_str = g_date_time_format (datetime, "%0X");
char *s;
for (s = time_str; *s; s++)
if (G_IS_DIR_SEPARATOR (*s))
*s = ':';
g_string_append (filename, time_str);
g_free (time_str);
g_date_time_unref (datetime);
}
break;
default:
g_warning ("Unknown escape %%%c in filename", *(p + 1));
goto out;
}
p++;
}
else
g_string_append_c (filename, *p);
}
/* If a filename is explicitly specified without %u then we assume the user
* is fine with over-writing the old contents; putting %u in the default
* should avoid problems with malicious symlinks.
*/
flags = O_WRONLY | O_CREAT | O_TRUNC;
path = get_absolute_path (filename->str);
outfile = open (path, flags, 0666);
if (outfile != -1)
{
g_printerr ("Recording to %s\n", path);
if (outfilename != NULL)
*outfilename = path;
else
g_free (path);
g_string_free (filename, TRUE);
goto out;
}
if (outfile == -1 && errno != EEXIST)
{
g_warning ("Cannot open output file '%s': %s", filename->str, g_strerror (errno));
g_string_free (filename, TRUE);
g_free (path);
goto out;
}
g_string_free (filename, TRUE);
g_free (path);
}
out:
return outfile;
}
/* Augments the supplied pipeline with a sink element to write to the output
* file, if necessary.
*/
static gboolean
recorder_pipeline_add_sink (RecorderPipeline *pipeline)
{
GstPad *sink_pad = NULL, *src_pad = NULL;
GstElement *fdsink;
gboolean result = FALSE;
src_pad = gst_bin_find_unlinked_pad (GST_BIN (pipeline->pipeline), GST_PAD_SRC);
if (src_pad == NULL)
{
/* Nothing to do - assume that we were given a complete pipeline */
return TRUE;
}
pipeline->outfile = recorder_open_outfile (pipeline->recorder,
&pipeline->filename);
if (pipeline->outfile == -1)
goto out;
fdsink = gst_element_factory_make ("fdsink", NULL);
if (fdsink == NULL)
{
g_warning("Can't create fdsink element");
goto out;
}
gst_bin_add (GST_BIN (pipeline->pipeline), fdsink);
g_object_set (fdsink, "fd", pipeline->outfile, NULL);
sink_pad = gst_element_get_static_pad (fdsink, "sink");
if (!sink_pad)
{
g_warning("ShellRecorder: can't get sink pad to link pipeline output");
goto out;
}
if (gst_pad_link (src_pad, sink_pad) != GST_PAD_LINK_OK)
{
g_warning("ShellRecorder: can't link to sink pad");
goto out;
}
result = TRUE;
out:
if (src_pad)
gst_object_unref (src_pad);
if (sink_pad)
gst_object_unref (sink_pad);
return result;
}
static gboolean
recorder_update_memory_used_timeout (gpointer data)
{
ShellRecorder *recorder = data;
recorder->update_memory_used_timeout = 0;
recorder_update_memory_used (recorder, TRUE);
return FALSE;
}
/* We throttle down the frequency which we recompute memory usage
* and draw the buffer indicator to avoid cutting into performance.
*/
static void
recorder_pipeline_on_memory_used_changed (ShellRecorderSrc *src,
GParamSpec *spec,
RecorderPipeline *pipeline)
{
ShellRecorder *recorder = pipeline->recorder;
if (!recorder)
return;
if (recorder->update_memory_used_timeout == 0)
{
recorder->update_memory_used_timeout = g_timeout_add (UPDATE_MEMORY_USED_DELAY,
recorder_update_memory_used_timeout,
recorder);
g_source_set_name_by_id (recorder->update_memory_used_timeout, "[gnome-shell] recorder_update_memory_used_timeout");
}
}
static void
recorder_pipeline_free (RecorderPipeline *pipeline)
{
if (pipeline->pipeline != NULL)
gst_object_unref (pipeline->pipeline);
if (pipeline->outfile != -1)
close (pipeline->outfile);
g_free (pipeline->filename);
g_clear_object (&pipeline->recorder);
g_free (pipeline);
}
/* Function gets called on pipeline-global events; we use it to
* know when the pipeline is finished.
*/
static gboolean
recorder_pipeline_bus_watch (GstBus *bus,
GstMessage *message,
gpointer data)
{
RecorderPipeline *pipeline = data;
if (message->type == GST_MESSAGE_EOS)
{
recorder_pipeline_closed (pipeline);
return FALSE; /* remove watch */
}
else if (message->type == GST_MESSAGE_ERROR)
{
GError *error;
gst_message_parse_error (message, &error, NULL);
g_warning ("Error in recording pipeline: %s\n", error->message);
g_error_free (error);
recorder_pipeline_closed (pipeline);
return FALSE; /* remove watch */
}
/* Leave the watch in place */
return TRUE;
}
/* Clean up when the pipeline is finished
*/
static void
recorder_pipeline_closed (RecorderPipeline *pipeline)
{
g_signal_handlers_disconnect_by_func (pipeline->src,
(gpointer) recorder_pipeline_on_memory_used_changed,
pipeline);
recorder_disconnect_stage_callbacks (pipeline->recorder);
gst_element_set_state (pipeline->pipeline, GST_STATE_NULL);
if (pipeline->recorder)
{
GtkRecentManager *recent_manager;
GFile *file;
char *uri;
ShellRecorder *recorder = pipeline->recorder;
if (pipeline == recorder->current_pipeline)
{
/* Error case; force a close */
recorder->current_pipeline = NULL;
shell_recorder_close (recorder);
}
recent_manager = gtk_recent_manager_get_default ();
file = g_file_new_for_path (pipeline->filename);
uri = g_file_get_uri (file);
gtk_recent_manager_add_item (recent_manager,
uri);
g_free (uri);
g_object_unref (file);
recorder->pipelines = g_slist_remove (recorder->pipelines, pipeline);
}
recorder_pipeline_free (pipeline);
}
/*
* Replaces '%T' in the passed pipeline with the thread count,
* the maximum possible value is 64 (limit of what vp9enc supports)
*
* It is assumes that %T occurs only once.
*/
static char*
substitute_thread_count (const char *pipeline)
{
char *tmp;
int n_threads;
GString *result;
tmp = strstr (pipeline, "%T");
if (!tmp)
return g_strdup (pipeline);
#ifdef _SC_NPROCESSORS_ONLN
{
int n_processors = sysconf (_SC_NPROCESSORS_ONLN); /* includes hyper-threading */
n_threads = MIN (MAX (1, n_processors - 1), 64);
}
#else
n_threads = 3;
#endif
result = g_string_new (NULL);
g_string_append_len (result, pipeline, tmp - pipeline);
g_string_append_printf (result, "%d", n_threads);
g_string_append (result, tmp + 2);
return g_string_free (result, FALSE);
}
static gboolean
recorder_open_pipeline (ShellRecorder *recorder)
{
RecorderPipeline *pipeline;
const char *pipeline_description;
char *parsed_pipeline;
GError *error = NULL;
GstBus *bus;
pipeline = g_new0 (RecorderPipeline, 1);
pipeline->recorder = g_object_ref (recorder);
pipeline->outfile = - 1;
pipeline_description = recorder->pipeline_description;
if (!pipeline_description)
pipeline_description = DEFAULT_PIPELINE;
parsed_pipeline = substitute_thread_count (pipeline_description);
pipeline->pipeline = gst_parse_launch_full (parsed_pipeline, NULL,
GST_PARSE_FLAG_FATAL_ERRORS,
&error);
g_free (parsed_pipeline);
if (pipeline->pipeline == NULL)
{
g_warning ("ShellRecorder: failed to parse pipeline: %s", error->message);
g_error_free (error);
goto error;
}
if (!recorder_pipeline_add_source (pipeline))
goto error;
if (!recorder_pipeline_add_sink (pipeline))
goto error;
gst_element_set_state (pipeline->pipeline, GST_STATE_PLAYING);
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline->pipeline));
gst_bus_add_watch (bus, recorder_pipeline_bus_watch, pipeline);
gst_object_unref (bus);
g_signal_connect (pipeline->src, "notify::memory-used",
G_CALLBACK (recorder_pipeline_on_memory_used_changed), pipeline);
recorder->current_pipeline = pipeline;
recorder->pipelines = g_slist_prepend (recorder->pipelines, pipeline);
return TRUE;
error:
recorder_pipeline_free (pipeline);
return FALSE;
}
static void
recorder_close_pipeline (ShellRecorder *recorder)
{
if (recorder->current_pipeline != NULL)
{
/* This will send an EOS (end-of-stream) message after the last frame
* is written. The bus watch for the pipeline will get it and do
* final cleanup
*/
gst_element_send_event (recorder->current_pipeline->pipeline,
gst_event_new_eos());
recorder->current_pipeline = NULL;
}
}
/**
* shell_recorder_new:
* @stage: The #ClutterStage
*
* Create a new #ShellRecorder to record movies of a #ClutterStage
*
* Return value: The newly created #ShellRecorder object
*/
ShellRecorder *
shell_recorder_new (ClutterStage *stage)
{
return g_object_new (SHELL_TYPE_RECORDER,
"stage", stage,
NULL);
}
/**
* shell_recorder_set_framerate:
* @recorder: the #ShellRecorder
* @framerate: Framerate used for resulting video in frames-per-second.
*
* Sets the number of frames per second we try to record. Less frames
* will be recorded when the screen doesn't need to be redrawn this
* quickly. (This value will also be set as the framerate for the
* GStreamer pipeline; whether that has an effect on the resulting
* video will depend on the details of the pipeline and the codec. The
* default encoding to webm format doesn't pay attention to the pipeline
* framerate.)
*
* The default value is 30.
*/
void
shell_recorder_set_framerate (ShellRecorder *recorder,
int framerate)
{
g_return_if_fail (SHELL_IS_RECORDER (recorder));
recorder_set_framerate (recorder, framerate);
}
/**
* shell_recorder_set_file_template:
* @recorder: the #ShellRecorder
* @file_template: the filename template to use for output files,
* or %NULL for the defalt value.
*
* Sets the filename that will be used when creating output
* files. This is only used if the configured pipeline has an
* unconnected source pad (as the default pipeline does). If
* the pipeline is complete, then the filename is unused. The
* provided string is used as a template.It can contain
* the following escapes:
*
* %d: The current date as YYYYYMMDD
* %%: A literal percent
*
* The default value is 'shell-%d%u-%c.ogg'.
*/
void
shell_recorder_set_file_template (ShellRecorder *recorder,
const char *file_template)
{
g_return_if_fail (SHELL_IS_RECORDER (recorder));
recorder_set_file_template (recorder, file_template);
}
void
shell_recorder_set_draw_cursor (ShellRecorder *recorder,
gboolean draw_cursor)
{
g_return_if_fail (SHELL_IS_RECORDER (recorder));
recorder_set_draw_cursor (recorder, draw_cursor);
}
/**
* shell_recorder_set_pipeline:
* @recorder: the #ShellRecorder
* @pipeline: (nullable): the GStreamer pipeline used to encode recordings
* or %NULL for the default value.
*
* Sets the GStreamer pipeline used to encode recordings.
* It follows the syntax used for gst-launch. The pipeline
* should have an unconnected sink pad where the recorded
* video is recorded. It will normally have a unconnected
* source pad; output from that pad will be written into the
* output file. (See shell_recorder_set_file_template().) However
* the pipeline can also take care of its own output - this
* might be used to send the output to an icecast server
* via shout2send or similar.
*
* The default value is 'vp9enc min_quantizer=13 max_quantizer=13 cpu-used=5 deadline=1000000 threads=%T ! queue ! webmmux'
*/
void
shell_recorder_set_pipeline (ShellRecorder *recorder,
const char *pipeline)
{
g_return_if_fail (SHELL_IS_RECORDER (recorder));
recorder_set_pipeline (recorder, pipeline);
}
void
shell_recorder_set_area (ShellRecorder *recorder,
int x,
int y,
int width,
int height)
{
g_return_if_fail (SHELL_IS_RECORDER (recorder));
recorder->custom_area = TRUE;
recorder->area.x = CLAMP (x, 0, recorder->stage_width);
recorder->area.y = CLAMP (y, 0, recorder->stage_height);
recorder->area.width = CLAMP (width,
0, recorder->stage_width - recorder->area.x);
recorder->area.height = CLAMP (height,
0, recorder->stage_height - recorder->area.y);
/* This breaks the recording but tweaking the GStreamer pipeline a bit
* might make it work, at least if the codec can handle a stream where
* the frame size changes in the middle.
*/
if (recorder->current_pipeline)
recorder_pipeline_set_caps (recorder->current_pipeline);
}
/**
* shell_recorder_record:
* @recorder: the #ShellRecorder
* @filename_used: (out) (optional): actual filename used for recording
*
* Starts recording, Starting the recording may fail if the output file
* cannot be opened, or if the output stream cannot be created
* for other reasons. In that case a warning is printed to
* stderr. There is no way currently to get details on how
* recording failed to start.
*
* An extra reference count is added to the recorder if recording
* is succesfully started; the recording object will not be freed
* until recording is stopped even if the creator no longer holds
* a reference. Recording is automatically stopped if the stage
* is destroyed.
*
* Return value: %TRUE if recording was succesfully started
*/
gboolean
shell_recorder_record (ShellRecorder *recorder,
char **filename_used)
{
g_return_val_if_fail (SHELL_IS_RECORDER (recorder), FALSE);
g_return_val_if_fail (recorder->stage != NULL, FALSE);
g_return_val_if_fail (recorder->state != RECORDER_STATE_RECORDING, FALSE);
if (!recorder_open_pipeline (recorder))
return FALSE;
if (filename_used)
*filename_used = g_strdup (recorder->current_pipeline->filename);
recorder_connect_stage_callbacks (recorder);
recorder->last_frame_time = GST_CLOCK_TIME_NONE;
recorder->state = RECORDER_STATE_RECORDING;
recorder_update_pointer (recorder);
recorder_add_update_pointer_timeout (recorder);
/* Disable unredirection while we are recoring */
meta_disable_unredirect_for_screen (shell_global_get_screen (shell_global_get ()));
/* Set up repaint hook */
recorder->repaint_hook_id = clutter_threads_add_repaint_func(recorder_repaint_hook, recorder->stage, NULL);
/* Record an initial frame and also redraw with the indicator */
clutter_actor_queue_redraw (CLUTTER_ACTOR (recorder->stage));
/* We keep a ref while recording to let a caller start a recording then
* drop their reference to the recorder
*/
g_object_ref (recorder);
return TRUE;
}
/**
* shell_recorder_close:
* @recorder: the #ShellRecorder
*
* Stops recording. It's possible to call shell_recorder_record()
* again to reopen a new recording stream, but unless change the
* recording filename, this may result in the old recording being
* overwritten.
*/
void
shell_recorder_close (ShellRecorder *recorder)
{
g_return_if_fail (SHELL_IS_RECORDER (recorder));
g_return_if_fail (recorder->state != RECORDER_STATE_CLOSED);
/* We want to record one more frame since some time may have
* elapsed since the last frame
*/
clutter_actor_paint (CLUTTER_ACTOR (recorder->stage));
recorder_remove_update_pointer_timeout (recorder);
recorder_close_pipeline (recorder);
/* Queue a redraw to remove the recording indicator */
clutter_actor_queue_redraw (CLUTTER_ACTOR (recorder->stage));
if (recorder->repaint_hook_id != 0)
{
clutter_threads_remove_repaint_func (recorder->repaint_hook_id);
recorder->repaint_hook_id = 0;
}
recorder->state = RECORDER_STATE_CLOSED;
/* Reenable after the recording */
meta_enable_unredirect_for_screen (shell_global_get_screen (shell_global_get ()));
/* Release the refcount we took when we started recording */
g_object_unref (recorder);
}
/**
* shell_recorder_is_recording:
*
* Determine if recording is currently in progress. (The recorder
* is not paused or closed.)
*
* Return value: %TRUE if the recorder is currently recording.
*/
gboolean
shell_recorder_is_recording (ShellRecorder *recorder)
{
g_return_val_if_fail (SHELL_IS_RECORDER (recorder), FALSE);
return recorder->state == RECORDER_STATE_RECORDING;
}
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