Re: [Swftools-common] issue when embedding audio

[Pablo Rodríguez]

Thanks for the reply, Matthias.

Matthias Kramm wrote:
> On Sat, Oct 25, 2008 at 03:18:33PM +0200, Pablo Rodríguez <address@hidden> 
> wrote:
> > Sorry, Matthias, I uploaded the wrong files. The r	ight one is to be 
> > found at http://ousia.justfree.com/prueba-audio.swf.
>
> This WAV file is broken (truncated) indeed.
> Or did you really expect 101 Minutes of audio data to be contained
> in 1.7 Mb of data? :)

I recorded the file and it only took less than a minute. So the 101 
minutes of audio were clearly wrong ;-).

> Btw., how did you create this file?

With a Python GStreamer script (bellow). The GStreamer documentation 
describes the "Controlled shutdown of live sources in applications" 
(http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseSrc.html) 
and proposes the following solution:

Since GStreamer 0.10.16 an application may send an EOS event to a source 
element to make it perform the EOS logic (send EOS event downstream or 
post a GST_MESSAGE_SEGMENT_DONE on the bus). This can typically be done 
with the gst_element_send_event() function on the element or its parent bin.

The question is that I don't know how how the use the 
gst_element_send_event() and probably because of that, the file is 
truncated.

def __init__(self):

    self.player = gst.Pipeline("player")
    self.clock = self.player.get_clock()

    self.source = gst.element_factory_make("alsasrc", "alsa-source")

    self.encoder = gst.element_factory_make("wavenc", "wavenc")

    self.fileout = gst.element_factory_make("filesink", "sink")
    self.fileout.set_property("location", self.filename + "-audio.wav")

    self.player.add(self.source, self.encoder, self.fileout)
    gst.element_link_many(self.source, self.encoder, self.fileout)

    bus = self.player.get_bus()
    bus.add_signal_watch()
    bus.enable_sync_message_emission()
    bus.connect('message', self.on_message)

    self.playing = False

    self.recording_time = self.player.get_last_stream_time()

def on_message(self, bus, message):
    t = message.type
    if t == gst.MESSAGE_EOS:
        self.player.set_state(gst.STATE_NULL)
    elif t == gst.MESSAGE_ERROR:
        err, debug = message.parse_error()
        print "Error: %s" % err, debug
        self.player.set_state(gst.STATE_NULL)

def on_key_press_event(self, widget, event):
    if (event.keyval == gtk.keysyms.space):
        if self.playing == False:
            self.playing = True
            self.player.set_state(gst.STATE_PLAYING)
        elif self.playing == True:
            self.player.set_state(gst.STATE_NULL)

Thanks for your help,


Pablo