Sugar Almanac GStreamer: Difference between revisions
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Line 143: | Line 143: | ||
self.gplayWin.resize( 300, 400 ) |
self.gplayWin.resize( 300, 400 ) |
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self.gplayWin.show_all( ) |
self.gplayWin.show_all( ) |
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</pre> |
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=== How can I add play/pause buttons and a scrubber to my audio or video? === |
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<pre> |
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import gtk |
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import pygtk |
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pygtk.require('2.0') |
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import pygst |
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pygst.require('0.10') |
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import gst |
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import gst.interfaces |
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import gobject |
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import sugar.graphics.style |
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class GScrub(gtk.Window): |
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def __init__(self, gplay, playImg, pauseImg): |
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gtk.Window.__init__(self) |
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self._gplay = gplay |
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self._playImg = playImg |
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self._pauseImg = pauseImg |
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self.UPDATE_INTERVAL = 500 |
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self.UPDATE_SCALE_ID = 0 |
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self.CHANGED_ID = 0 |
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self.was_playing = False |
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self.p_position = gst.CLOCK_TIME_NONE |
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self.p_duration = gst.CLOCK_TIME_NONE |
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self.hbox = gtk.HBox() |
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self.hbox.modify_bg( gtk.STATE_NORMAL, sugar.graphics.style.COLOR_BLACK.get_gdk_color() ) |
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self.hbox.modify_bg( gtk.STATE_INSENSITIVE, sugar.graphics.style.COLOR_BLACK.get_gdk_color() ) |
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self.add( self.hbox ) |
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self.button = gtk.Button() |
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buttBox = gtk.EventBox() |
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buttBox.add(self.button) |
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buttBox.modify_bg( gtk.STATE_NORMAL, sugar.graphics.style.COLOR_BLACK.get_gdk_color() ) |
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self.button.set_image( self._playImg ) |
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self.button.set_property('can-default', True) |
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self.button.set_relief(gtk.RELIEF_NONE) |
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self.button.set_size_request( 55, 55 ) |
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buttBox.set_size_request( 55, 55 ) |
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self.button.show() |
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buttBox.modify_bg( gtk.STATE_NORMAL, sugar.graphics.style.COLOR_BLACK.get_gdk_color() ) |
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self.button.modify_bg( gtk.STATE_ACTIVE, sugar.graphics.style.COLOR_BLACK.get_gdk_color() ) |
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self.button.connect('clicked', self._buttonClickedCb) |
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self.hbox.pack_start(buttBox, expand=False) |
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self.adjustment = gtk.Adjustment(0.0, 0.00, 100.0, 0.1, 1.0, 1.0) |
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self.hscale = gtk.HScale(self.adjustment) |
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self.hscale.set_draw_value(False) |
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self.hscale.set_update_policy(gtk.UPDATE_CONTINUOUS) |
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hscaleBox = gtk.EventBox() |
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hscaleBox.modify_bg( gtk.STATE_NORMAL, sugar.graphics.style.COLOR_BLACK.get_gdk_color() ) |
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hscaleBox.add( self.hscale ) |
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self.hscale.connect('button-press-event', self._scaleButtonPressCb) |
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self.hscale.connect('button-release-event', self._scaleButtonReleaseCb) |
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self.hbox.pack_start(hscaleBox, expand=True) |
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def removeCallbacks( self ): |
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if (self.UPDATE_SCALE_ID != 0): |
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gobject.source_remove(self.UPDATE_SCALE_ID) |
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self.UPDATE_SCALE_ID = 0 |
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if (self.CHANGED_ID != 0): |
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gobject.source_remove(self.CHANGED_ID) |
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self.CHANGED_ID = 0 |
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def reset(self): |
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self.adjustment.set_value(0) |
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def _buttonClickedCb(self, widget): |
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self.play_toggled() |
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def set_button_play(self): |
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self.button.set_image(self._playImg) |
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def set_button_pause(self): |
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self.button.set_image(self._pauseImg) |
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def play_toggled(self): |
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self.p_position, self.p_duration = self._gplay.queryPosition() |
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if (self.p_position == self.p_duration): |
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self._gplay.seek(0) |
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self._gplay.pause() |
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if self._gplay.is_playing(): |
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self._gplay.pause() |
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self.set_button_play() |
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else: |
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#if self._gplay.error: |
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# #todo: check if we have "error", and also to disable everything |
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# self.button.set_disabled() |
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#else: |
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self.doPlay() |
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def doPlay(self): |
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self._gplay.play() |
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if self.UPDATE_SCALE_ID == 0: |
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self.UPDATE_SCALE_ID = gobject.timeout_add(self.UPDATE_INTERVAL, self._updateScaleCb) |
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self.set_button_pause() |
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def _scaleButtonPressCb(self, widget, event): |
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#self.button.set_sensitive(False) |
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self.was_playing = self._gplay.is_playing() |
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if self.was_playing: |
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self._gplay.pause() |
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# don't timeout-update position during seek |
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if self.UPDATE_SCALE_ID != 0: |
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gobject.source_remove(self.UPDATE_SCALE_ID) |
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self.UPDATE_SCALE_ID = 0 |
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# make sure we get changed notifies |
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if self.CHANGED_ID == 0: |
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self.CHANGED_ID = self.hscale.connect('value-changed', self._scaleValueChangedCb) |
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def _scaleButtonReleaseCb(self, widget, event): |
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# see seek.cstop_seek |
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widget.disconnect(self.CHANGED_ID) |
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self.CHANGED_ID = 0 |
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#self.button.set_sensitive(True) |
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if self.was_playing: |
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self._gplay.play() |
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if self.UPDATE_SCALE_ID != 0: |
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pass |
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#print('Had a previous update timeout id') |
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else: |
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self.UPDATE_SCALE_ID = gobject.timeout_add(self.UPDATE_INTERVAL, self._updateScaleCb) |
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def _scaleValueChangedCb(self, scale): |
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real = long(scale.get_value() * self.p_duration / 100) # in ns |
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self._gplay.seek(real) |
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# allow for a preroll |
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self._gplay.get_state(timeout=50*gst.MSECOND) # 50 ms |
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def _updateScaleCb(self): |
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self.p_position, self.p_duration = self._gplay.queryPosition() |
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if self.p_position != gst.CLOCK_TIME_NONE: |
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value = self.p_position * 100.0 / self.p_duration |
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if (value > 99): |
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value = 99 |
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elif (value < 0): |
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value = 0 |
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self.adjustment.set_value(value) |
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if self._gplay.is_playing() and (self.p_position == self.p_duration): |
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self._gplay.pause() |
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self.set_button_play() |
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return True |
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</pre> |
</pre> |
Revision as of 15:53, 3 October 2008
For Developers
Where can I get additional resources and sample code on using the camera?
How can I embed video files in my activity?
Sugar, by default, can play back audio (encoded in Vorbis) and video (encoded in Theora) files in ogg containers.
The following file will be helpful for embedding video or audio files into your activity. After the code posting is a code snippet showing how to use this.
import gtk import pygtk pygtk.require('2.0') import sys import pygst pygst.require('0.10') import gst import gst.interfaces import gobject import time gobject.threads_init() class Gplay: def __init__(self): self.window = None self.playing = False self.player = gst.element_factory_make("playbin", "playbin") xis = gst.element_factory_make("xvimagesink", "xvimagesink") self.player.set_property("video-sink", xis) bus = self.player.get_bus() bus.enable_sync_message_emission() bus.add_signal_watch() self.SYNC_ID = bus.connect('sync-message::element', self._onSyncMessageCb) def _onSyncMessageCb(self, bus, message): if message.structure is None: return True if message.structure.get_name() == 'prepare-xwindow-id': self.window.set_sink(message.src) message.src.set_property('force-aspect-ratio', True) return True def setFile(self, path): uri = "file://" + str( path ) if (self.player.get_property('uri') == uri): self.seek(gst.SECOND*0) return self.player.set_state(gst.STATE_READY) self.player.set_property('uri', uri) ext = uri[len(uri)-3:] if (ext == "jpg"): self.pause() else: self.play() def queryPosition(self): #"Returns a (position, duration) tuple" try: position, format = self.player.query_position(gst.FORMAT_TIME) except: position = gst.CLOCK_TIME_NONE try: duration, format = self.player.query_duration(gst.FORMAT_TIME) except: duration = gst.CLOCK_TIME_NONE return (position, duration) def seek(self, time): event = gst.event_new_seek(1.0, gst.FORMAT_TIME, gst.SEEK_FLAG_FLUSH | gst.SEEK_FLAG_ACCURATE, gst.SEEK_TYPE_SET, time, gst.SEEK_TYPE_NONE, 0) res = self.player.send_event(event) if res: self.player.set_new_stream_time(0L) def pause(self): self.playing = False self.player.set_state(gst.STATE_PAUSED) def play(self): self.playing = True self.player.set_state(gst.STATE_PLAYING) def stop(self): self.playing = False self.player.set_state(gst.STATE_NULL) self.nextMovie() def get_state(self, timeout=1): return self.player.get_state(timeout=timeout) def is_playing(self): return self.playing class PlayVideoWindow(gtk.Window): def __init__(self): gtk.Window.__init__(self) self.imagesink = None self.unset_flags(gtk.DOUBLE_BUFFERED) self.set_flags(gtk.APP_PAINTABLE) def set_sink(self, sink): if (self.imagesink != None): assert self.window.xid self.imagesink = None del self.imagesink self.imagesink = sink self.imagesink.set_xwindow_id(self.window.xid)
And here is a code snippet showing how you would use this file to embed media playback in your activity:
#this is our video playback window self.gplay = Gplay( ) self.gplayWin = PlayVideoWindow( ) self.gplay.window = self.gplayWin self.gplayWin.set_type_hint( gtk.gdk.WINDOW_TYPE_HINT_DIALOG ) self.gplayWin.set_decorated( False ) self.gplayWin.set_transient_for( self ) #activity subclass self.gplayWin.move( 100, 100 ) self.gplayWin.resize( 300, 400 ) self.gplayWin.show_all( )
How can I add play/pause buttons and a scrubber to my audio or video?
import gtk import pygtk pygtk.require('2.0') import pygst pygst.require('0.10') import gst import gst.interfaces import gobject import sugar.graphics.style class GScrub(gtk.Window): def __init__(self, gplay, playImg, pauseImg): gtk.Window.__init__(self) self._gplay = gplay self._playImg = playImg self._pauseImg = pauseImg self.UPDATE_INTERVAL = 500 self.UPDATE_SCALE_ID = 0 self.CHANGED_ID = 0 self.was_playing = False self.p_position = gst.CLOCK_TIME_NONE self.p_duration = gst.CLOCK_TIME_NONE self.hbox = gtk.HBox() self.hbox.modify_bg( gtk.STATE_NORMAL, sugar.graphics.style.COLOR_BLACK.get_gdk_color() ) self.hbox.modify_bg( gtk.STATE_INSENSITIVE, sugar.graphics.style.COLOR_BLACK.get_gdk_color() ) self.add( self.hbox ) self.button = gtk.Button() buttBox = gtk.EventBox() buttBox.add(self.button) buttBox.modify_bg( gtk.STATE_NORMAL, sugar.graphics.style.COLOR_BLACK.get_gdk_color() ) self.button.set_image( self._playImg ) self.button.set_property('can-default', True) self.button.set_relief(gtk.RELIEF_NONE) self.button.set_size_request( 55, 55 ) buttBox.set_size_request( 55, 55 ) self.button.show() buttBox.modify_bg( gtk.STATE_NORMAL, sugar.graphics.style.COLOR_BLACK.get_gdk_color() ) self.button.modify_bg( gtk.STATE_ACTIVE, sugar.graphics.style.COLOR_BLACK.get_gdk_color() ) self.button.connect('clicked', self._buttonClickedCb) self.hbox.pack_start(buttBox, expand=False) self.adjustment = gtk.Adjustment(0.0, 0.00, 100.0, 0.1, 1.0, 1.0) self.hscale = gtk.HScale(self.adjustment) self.hscale.set_draw_value(False) self.hscale.set_update_policy(gtk.UPDATE_CONTINUOUS) hscaleBox = gtk.EventBox() hscaleBox.modify_bg( gtk.STATE_NORMAL, sugar.graphics.style.COLOR_BLACK.get_gdk_color() ) hscaleBox.add( self.hscale ) self.hscale.connect('button-press-event', self._scaleButtonPressCb) self.hscale.connect('button-release-event', self._scaleButtonReleaseCb) self.hbox.pack_start(hscaleBox, expand=True) def removeCallbacks( self ): if (self.UPDATE_SCALE_ID != 0): gobject.source_remove(self.UPDATE_SCALE_ID) self.UPDATE_SCALE_ID = 0 if (self.CHANGED_ID != 0): gobject.source_remove(self.CHANGED_ID) self.CHANGED_ID = 0 def reset(self): self.adjustment.set_value(0) def _buttonClickedCb(self, widget): self.play_toggled() def set_button_play(self): self.button.set_image(self._playImg) def set_button_pause(self): self.button.set_image(self._pauseImg) def play_toggled(self): self.p_position, self.p_duration = self._gplay.queryPosition() if (self.p_position == self.p_duration): self._gplay.seek(0) self._gplay.pause() if self._gplay.is_playing(): self._gplay.pause() self.set_button_play() else: #if self._gplay.error: # #todo: check if we have "error", and also to disable everything # self.button.set_disabled() #else: self.doPlay() def doPlay(self): self._gplay.play() if self.UPDATE_SCALE_ID == 0: self.UPDATE_SCALE_ID = gobject.timeout_add(self.UPDATE_INTERVAL, self._updateScaleCb) self.set_button_pause() def _scaleButtonPressCb(self, widget, event): #self.button.set_sensitive(False) self.was_playing = self._gplay.is_playing() if self.was_playing: self._gplay.pause() # don't timeout-update position during seek if self.UPDATE_SCALE_ID != 0: gobject.source_remove(self.UPDATE_SCALE_ID) self.UPDATE_SCALE_ID = 0 # make sure we get changed notifies if self.CHANGED_ID == 0: self.CHANGED_ID = self.hscale.connect('value-changed', self._scaleValueChangedCb) def _scaleButtonReleaseCb(self, widget, event): # see seek.cstop_seek widget.disconnect(self.CHANGED_ID) self.CHANGED_ID = 0 #self.button.set_sensitive(True) if self.was_playing: self._gplay.play() if self.UPDATE_SCALE_ID != 0: pass #print('Had a previous update timeout id') else: self.UPDATE_SCALE_ID = gobject.timeout_add(self.UPDATE_INTERVAL, self._updateScaleCb) def _scaleValueChangedCb(self, scale): real = long(scale.get_value() * self.p_duration / 100) # in ns self._gplay.seek(real) # allow for a preroll self._gplay.get_state(timeout=50*gst.MSECOND) # 50 ms def _updateScaleCb(self): self.p_position, self.p_duration = self._gplay.queryPosition() if self.p_position != gst.CLOCK_TIME_NONE: value = self.p_position * 100.0 / self.p_duration if (value > 99): value = 99 elif (value < 0): value = 0 self.adjustment.set_value(value) if self._gplay.is_playing() and (self.p_position == self.p_duration): self._gplay.pause() self.set_button_play() return True