[gstreamer-bugs] [Bug 576534] ts-offset property of appsink is ineffective

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-base | Ver: git




------- Comment #3 from Fraxinas  2009-03-24 18:18 UTC -------
with this code in our app i can work around the issue by calculating the needed
offset and then delaying it with a proprietary timer call:

void eServiceMP3::gstCBsubtitleAvail(GstElement *appsink, gpointer user_data)
{
        eServiceMP3 *_this = (eServiceMP3*)user_data;
        GstBuffer *buffer;
        g_signal_emit_by_name (appsink, "pull-buffer", &buffer);
        if (buffer)
        {
                GstFormat fmt = GST_FORMAT_TIME;
                gint64 buf_pos = GST_BUFFER_TIMESTAMP(buffer);
                gint64 duration_ns = GST_BUFFER_DURATION(buffer);
                size_t len = GST_BUFFER_SIZE(buffer);
                unsigned char line[len+1];
                memcpy(line, GST_BUFFER_DATA(buffer), len);
                line[len] = 0;
                eDebug("got new subtitle @ buf_pos = %lld ns (in pts=%lld):
'%s' ", buf_pos, buf_pos/11111, line);
                if ( _this->m_subtitle_widget )
                {
                        ePangoSubtitlePage page;
                        gRGB rgbcol(0xD0,0xD0,0xD0);
                       
page.m_elements.push_back(ePangoSubtitlePageElement(rgbcol, (const
char*)line));
                        page.show_pts = buf_pos / 11111L;
                        page.m_timeout = duration_ns / 1000000;
                        _this->m_subtitle_pages.push_back(page);
                        _this->pushSubtitles();
                }
        }
}

void eServiceMP3::pushSubtitles()
{
        ePangoSubtitlePage page;
        GstClockTime base_time;
        pts_t running_pts;
        GstElement *appsink =
gst_bin_get_by_name(GST_BIN(m_gst_playbin),"subtitle_sink");
        GstClock *clock;
        clock = gst_element_get_clock (appsink);
        do
        {
                page = m_subtitle_pages.front();

                base_time = gst_element_get_base_time (appsink);
                running_pts = ( gst_clock_get_time (clock) - base_time ) /
11111L;
                gint64 diff_ms = ( page.show_pts - running_pts ) / 90;
//              eDebug("eServiceMP3::pushSubtitles show_pts = %lld  running_pts
= %lld  diff = %lld", page.show_pts, running_pts, diff_ms);
                if ( diff_ms > 20 )
                {
//                      eDebug("m_subtitle_sync_timer->start(%lld,1)",
diff_ms);
                        m_subtitle_sync_timer->start(diff_ms, 1);
                        break;
                }
                else
                {
                        m_subtitle_widget->setPage(page);
                        m_subtitle_pages.pop_front();
                }
        } while ( !m_subtitle_pages.empty() );

        gst_object_unref (clock);
}


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