C++ (Cpp) gst_wildmidi_get_new_segment_event Beispiele

Beispiel #1

Datei: gstwildmidi.c Projekt: zsx/ossbuild

static GstFlowReturn
gst_wildmidi_parse_song (GstWildmidi * wildmidi)
{
  struct _WM_Info *info;
  GstCaps *outcaps;
  guint8 *data;
  guint size;

  GST_DEBUG_OBJECT (wildmidi, "Parsing song");

  size = gst_adapter_available (wildmidi->adapter);
  data = gst_adapter_take (wildmidi->adapter, size);

  /* this method takes our memory block */
  GST_OBJECT_LOCK (wildmidi);
  wildmidi->song = WildMidi_OpenBuffer (data, size);

  if (!wildmidi->song)
    goto open_failed;

  WildMidi_LoadSamples (wildmidi->song);

  WildMidi_SetOption (wildmidi->song, WM_MO_LINEAR_VOLUME,
      wildmidi->linear_volume);
  WildMidi_SetOption (wildmidi->song, WM_MO_EXPENSIVE_INTERPOLATION,
      wildmidi->high_quality);

  info = WildMidi_GetInfo (wildmidi->song);
  GST_OBJECT_UNLOCK (wildmidi);

  wildmidi->o_len = info->approx_total_samples;

  outcaps = gst_caps_copy (gst_pad_get_pad_template_caps (wildmidi->srcpad));
  gst_pad_set_caps (wildmidi->srcpad, outcaps);
  gst_caps_unref (outcaps);

  /* we keep an internal segment in samples */
  gst_segment_set_newsegment (wildmidi->o_segment, FALSE, 1.0,
      GST_FORMAT_DEFAULT, 0, GST_CLOCK_TIME_NONE, 0);

  gst_pad_push_event (wildmidi->srcpad,
      gst_wildmidi_get_new_segment_event (wildmidi, GST_FORMAT_TIME));

  GST_DEBUG_OBJECT (wildmidi, "Parsing song done");

  return GST_FLOW_OK;

  /* ERRORS */
open_failed:
  {
    GST_OBJECT_UNLOCK (wildmidi);
    GST_ELEMENT_ERROR (wildmidi, STREAM, DECODE, (NULL),
        ("Unable to parse midi data"));
    return GST_FLOW_ERROR;
  }
}

Beispiel #2

static gboolean
gst_wildmidi_do_seek (GstWildmidi * wildmidi, GstEvent * event)
{
  gdouble rate;
  GstFormat src_format, dst_format;
  GstSeekFlags flags;
  GstSeekType start_type, stop_type;
  gint64 start, stop;
  gboolean flush, update;
#ifdef HAVE_WILDMIDI_0_2_2
  gboolean accurate;
#endif
  gboolean res;
  unsigned long int sample;
  GstSegment *segment;

  if (!wildmidi->song)
    return FALSE;

  gst_event_parse_seek (event, &rate, &src_format, &flags,
      &start_type, &start, &stop_type, &stop);

  /* convert the input format to samples */
  dst_format = GST_FORMAT_DEFAULT;
  res = TRUE;
  if (start_type != GST_SEEK_TYPE_NONE) {
    res =
        gst_wildmidi_src_convert (wildmidi, src_format, start, &dst_format,
        &start);
  }
  if (res && stop_type != GST_SEEK_TYPE_NONE) {
    res =
        gst_wildmidi_src_convert (wildmidi, src_format, stop, &dst_format,
        &stop);
  }
  /* unsupported format */
  if (!res)
    return res;

  flush = ((flags & GST_SEEK_FLAG_FLUSH) == GST_SEEK_FLAG_FLUSH);
#ifdef HAVE_WILDMIDI_0_2_2
  accurate = ((flags & GST_SEEK_FLAG_ACCURATE) == GST_SEEK_FLAG_ACCURATE);
#endif

  if (flush) {
    GST_DEBUG ("performing flush");
    gst_pad_push_event (wildmidi->srcpad, gst_event_new_flush_start ());
  } else {
    gst_pad_stop_task (wildmidi->sinkpad);
  }

  segment = wildmidi->o_segment;

  GST_PAD_STREAM_LOCK (wildmidi->sinkpad);

  if (flush) {
    gst_pad_push_event (wildmidi->srcpad, gst_event_new_flush_stop (TRUE));
  }

  /* update the segment now */
  gst_segment_do_seek (segment, rate, dst_format, flags,
      start_type, start, stop_type, stop, &update);

  /* we need to seek to position in the segment now, sample will be updated */
  sample = segment->position;

  GST_OBJECT_LOCK (wildmidi);
#ifdef HAVE_WILDMIDI_0_2_2
  if (accurate) {
    WildMidi_SampledSeek (wildmidi->song, &sample);
  } else {
    WildMidi_FastSeek (wildmidi->song, &sample);
  }
#else
  WildMidi_FastSeek (wildmidi->song, &sample);
#endif

  GST_OBJECT_UNLOCK (wildmidi);

  segment->start = segment->time = segment->position = sample;

  gst_pad_push_event (wildmidi->srcpad,
      gst_wildmidi_get_new_segment_event (wildmidi, GST_FORMAT_TIME));

  gst_pad_start_task (wildmidi->sinkpad,
      (GstTaskFunction) gst_wildmidi_loop, wildmidi->sinkpad, NULL);

  wildmidi->discont = TRUE;
  GST_PAD_STREAM_UNLOCK (wildmidi->sinkpad);
  GST_DEBUG ("seek done");

  return TRUE;
}