C++ G_UNLIKELY函数代码示例

static GstFlowReturn
mpegts_base_scan (MpegTSBase * base)
{
  GstFlowReturn ret = GST_FLOW_OK;
  GstBuffer *buf = NULL;
  guint i;
  gboolean done = FALSE;
  MpegTSPacketizerPacketReturn pret;
  gint64 tmpval;
  gint64 upstream_size, seek_pos, reverse_limit;
  GstFormat format;
  guint initial_pcr_seen;

  GST_DEBUG ("Scanning for initial sync point");

  /* Find initial sync point and at least 5 PCR values */
  for (i = 0; i < 20 && !done; i++) {
    GST_DEBUG ("Grabbing %d => %d", i * 65536, (i + 1) * 65536);

    ret = gst_pad_pull_range (base->sinkpad, i * 65536, 65536, &buf);
    if (G_UNLIKELY (ret == GST_FLOW_EOS))
      break;
    if (G_UNLIKELY (ret != GST_FLOW_OK))
      goto beach;

    /* Push to packetizer */
    mpegts_packetizer_push (base->packetizer, buf);
    buf = NULL;

    if (mpegts_packetizer_has_packets (base->packetizer)) {
      if (base->seek_offset == -1) {
        /* Mark the initial sync point and remember the packetsize */
        base->seek_offset = base->packetizer->offset;
        GST_DEBUG ("Sync point is now %" G_GUINT64_FORMAT, base->seek_offset);
        base->packetsize = base->packetizer->packet_size;
      }
      while (1) {
        /* Eat up all packets */
        pret = mpegts_packetizer_process_next_packet (base->packetizer);
        if (pret == PACKET_NEED_MORE)
          break;
        if (pret != PACKET_BAD && base->packetizer->nb_seen_offsets >= 5) {
          GST_DEBUG ("Got enough initial PCR");
          done = TRUE;
          break;
        }
      }
    }
  }

  initial_pcr_seen = base->packetizer->nb_seen_offsets;
  if (G_UNLIKELY (initial_pcr_seen == 0))
    goto no_initial_pcr;
  GST_DEBUG ("Seen %d initial PCR", initial_pcr_seen);

  /* Now send data from the end */

  /* Get the size of upstream */
  format = GST_FORMAT_BYTES;
  if (!gst_pad_peer_query_duration (base->sinkpad, format, &tmpval))
    goto beach;
  upstream_size = tmpval;

  /* The scanning takes place on the last 2048kB. Considering PCR should
   * be present at least every 100ms, this should cope with streams
   * up to 160Mbit/s */
  reverse_limit = MAX (0, upstream_size - 2097152);

  /* Find last PCR value, searching backwards by chunks of 300 MPEG-ts packets */
  for (seek_pos = MAX (0, upstream_size - 56400);
      seek_pos >= reverse_limit; seek_pos -= 56400) {
    mpegts_packetizer_clear (base->packetizer);
    GST_DEBUG ("Grabbing %" G_GUINT64_FORMAT " => %" G_GUINT64_FORMAT, seek_pos,
        seek_pos + 56400);

    ret = gst_pad_pull_range (base->sinkpad, seek_pos, 56400, &buf);
    if (G_UNLIKELY (ret == GST_FLOW_EOS))
      break;
    if (G_UNLIKELY (ret != GST_FLOW_OK))
      goto beach;

    /* Push to packetizer */
    mpegts_packetizer_push (base->packetizer, buf);
    buf = NULL;

    if (mpegts_packetizer_has_packets (base->packetizer)) {
      pret = PACKET_OK;
      /* Eat up all packets, really try to get last PCR(s) */
      while (pret != PACKET_NEED_MORE)
        pret = mpegts_packetizer_process_next_packet (base->packetizer);

      if (base->packetizer->nb_seen_offsets > initial_pcr_seen) {
        GST_DEBUG ("Got last PCR(s) (total seen:%d)",
            base->packetizer->nb_seen_offsets);
        break;
      }
    }
  }

beach:
//.........这里部分代码省略.........

static void
psdflp_do(const PSDFLPArgs *args, GwyDataField *dfield, GwyDataField *lpsdf)
{
    enum { N = 4 };

    GwyDataField *reout, *imout;
    gint pxres, pyres, fxres, fyres;
    gint i, j, fi, pi;
    gdouble *ldata, *redata, *imdata;
    gdouble *cosphi, *sinphi;
    gdouble xreal, yreal, f0, f_max, b, p;

    reout = gwy_data_field_new_alike(dfield, FALSE);
    imout = gwy_data_field_new_alike(dfield, FALSE);
    gwy_data_field_2dfft(dfield, NULL, reout, imout,
                         args->window, GWY_TRANSFORM_DIRECTION_FORWARD,
                         GWY_INTERPOLATION_ROUND, /* Ignored */
                         TRUE, 1);

    pxres = reout->xres;
    pyres = reout->yres;
    redata = gwy_data_field_get_data(reout);
    imdata = gwy_data_field_get_data(imout);
    for (i = 0; i < pxres*pyres; i++)
        redata[i] = redata[i]*redata[i] + imdata[i]*imdata[i];
    gwy_data_field_2dfft_humanize(reout);
    gwy_data_field_filter_gaussian(reout, args->sigma);
    for (i = 0; i < pxres*pyres; i++)
        redata[i] = sqrt(redata[i]);

    fxres = pxres/2;
    fyres = pyres/2;
    gwy_data_field_resample(lpsdf, fxres, fyres, GWY_INTERPOLATION_NONE);
    ldata = gwy_data_field_get_data(lpsdf);

    xreal = dfield->xreal;
    yreal = dfield->yreal;
    f0 = 2.0/MIN(xreal, yreal);
    f_max = 0.5*MIN(pxres/xreal, pyres/yreal);
    if (f_max <= f0) {
        g_warning("Minimum frequency is not smaller than maximum frequency.");
    }
    b = log(f_max/f0)/fyres;

    /* Incorporate some prefactors to sinphi[] and cosphi[], knowing that
     * cosine is only ever used for x and sine for y frequencies. */
    cosphi = g_new(gdouble, (N+1)*fxres);
    sinphi = g_new(gdouble, (N+1)*fxres);
    for (j = 0; j < fxres; j++) {
        gdouble phi_from = 2.0*G_PI*j/fxres;
        gdouble phi_to = 2.0*G_PI*(j + 1.0)/fxres;

        for (pi = 0; pi <= N; pi++) {
            gdouble phi = ((pi + 0.5)*phi_from + (N - 0.5 - pi)*phi_to)/N;
            cosphi[j*(N+1) + pi] = cos(phi)*xreal;
            sinphi[j*(N+1) + pi] = sin(phi)*yreal;
        }
    }

    for (i = 0; i < fyres; i++) {
        gdouble f_from = f0*exp(b*i);
        gdouble f_to = f0*exp(b*(i + 1.0));

        for (j = 0; j < fxres; j++) {
            const gdouble *cosphi_j = cosphi + j*(N+1);
            const gdouble *sinphi_j = sinphi + j*(N+1);
            guint n = 0;
            gdouble s = 0.0;

            for (fi = 0; fi <= N; fi++) {
                gdouble f = ((fi + 0.5)*f_from + (N - 0.5 - fi)*f_to)/N;
                for (pi = 0; pi <= N; pi++) {
                    gdouble x = f*cosphi_j[pi] + pxres/2.0,
                            y = f*sinphi_j[pi] + pyres/2.0;

                    if (G_UNLIKELY(x < 0.5
                                   || y < 0.5
                                   || x > pxres - 1.5
                                   || y > pyres - 1.5))
                        continue;

                    p = gwy_data_field_get_dval(reout, x, y,
                                                GWY_INTERPOLATION_SCHAUM);
                    s += p;
                    n++;
                }
            }

            if (!n)
                n = 1;

            ldata[i*fxres + j] = 2.0*G_PI/fxres * s/n*(f_to - f_from);
        }
    }

    g_object_unref(imout);
    g_object_unref(reout);

    gwy_data_field_set_xreal(lpsdf, 2.0*G_PI);
    gwy_data_field_set_xoffset(lpsdf, 0.0);
//.........这里部分代码省略.........

static void
major_copy_or_mark_object (void **obj_slot, SgenGrayQueue *queue)
{
	char *forwarded;
	char *obj = *obj_slot;
	mword objsize;

	DEBUG (9, g_assert (current_collection_generation == GENERATION_OLD));

	HEAVY_STAT (++stat_copy_object_called_major);

	DEBUG (9, fprintf (gc_debug_file, "Precise copy of %p from %p", obj, obj_slot));

	/*
	 * obj must belong to one of:
	 *
	 * 1. the nursery
	 * 2. the LOS
	 * 3. a pinned chunk
	 * 4. a non-to-space section of the major heap
	 * 5. a to-space section of the major heap
	 *
	 * In addition, objects in 1, 2 and 4 might also be pinned.
	 * Objects in 1 and 4 might be forwarded.
	 *
	 * Before we can copy the object we must make sure that we are
	 * allowed to, i.e. that the object not pinned, not already
	 * forwarded, not in the nursery To Space and doesn't belong
	 * to the LOS, a pinned chunk, or a to-space section.
	 *
	 * We are usually called for to-space objects (5) when we have
	 * two remset entries for the same reference.  The first entry
	 * copies the object and updates the reference and the second
	 * calls us with the updated reference that points into
	 * to-space.  There might also be other circumstances where we
	 * get to-space objects.
	 */

	if ((forwarded = SGEN_OBJECT_IS_FORWARDED (obj))) {
		DEBUG (9, g_assert (((MonoVTable*)SGEN_LOAD_VTABLE(obj))->gc_descr));
		DEBUG (9, fprintf (gc_debug_file, " (already forwarded to %p)\n", forwarded));
		HEAVY_STAT (++stat_major_copy_object_failed_forwarded);
		*obj_slot = forwarded;
		return;
	}
	if (SGEN_OBJECT_IS_PINNED (obj)) {
		DEBUG (9, g_assert (((MonoVTable*)SGEN_LOAD_VTABLE(obj))->gc_descr));
		DEBUG (9, fprintf (gc_debug_file, " (pinned, no change)\n"));
		HEAVY_STAT (++stat_major_copy_object_failed_pinned);
		return;
	}

	if (ptr_in_nursery (obj)) {
		/* A To Space object is already on its final destination for the current collection. */
		if (sgen_nursery_is_to_space (obj))
			return;
		goto copy;
	}

	/*
	 * At this point we know obj is not pinned, not forwarded and
	 * belongs to 2, 3, 4, or 5.
	 *
	 * LOS object (2) are simple, at least until we always follow
	 * the rule: if objsize > SGEN_MAX_SMALL_OBJ_SIZE, pin the
	 * object and return it.  At the end of major collections, we
	 * walk the los list and if the object is pinned, it is
	 * marked, otherwise it can be freed.
	 *
	 * Pinned chunks (3) and major heap sections (4, 5) both
	 * reside in blocks, which are always aligned, so once we've
	 * eliminated LOS objects, we can just access the block and
	 * see whether it's a pinned chunk or a major heap section.
	 */

	objsize = SGEN_ALIGN_UP (sgen_safe_object_get_size ((MonoObject*)obj));

	if (G_UNLIKELY (objsize > SGEN_MAX_SMALL_OBJ_SIZE || obj_is_from_pinned_alloc (obj))) {
		if (SGEN_OBJECT_IS_PINNED (obj))
			return;
		DEBUG (9, fprintf (gc_debug_file, " (marked LOS/Pinned %p (%s), size: %td)\n", obj, sgen_safe_name (obj), objsize));
		binary_protocol_pin (obj, (gpointer)SGEN_LOAD_VTABLE (obj), sgen_safe_object_get_size ((MonoObject*)obj));
		SGEN_PIN_OBJECT (obj);
		GRAY_OBJECT_ENQUEUE (queue, obj);
		HEAVY_STAT (++stat_major_copy_object_failed_large_pinned);
		return;
	}

	/*
	 * Now we know the object is in a major heap section.  All we
	 * need to do is check whether it's already in to-space (5) or
	 * not (4).
	 */
	if (MAJOR_OBJ_IS_IN_TO_SPACE (obj)) {
		DEBUG (9, g_assert (objsize <= SGEN_MAX_SMALL_OBJ_SIZE));
		DEBUG (9, fprintf (gc_debug_file, " (already copied)\n"));
		HEAVY_STAT (++stat_major_copy_object_failed_to_space);
		return;
	}

//.........这里部分代码省略.........

/**
 * boundary_sort:
 * @segs:       unsorted input segs.
 * @num_segs:   number of input segs
 * @num_groups: number of groups in the sorted segs
 *
 * This function takes an array of #BoundSeg's as returned by
 * boundary_find() and sorts it by contiguous groups. The returned
 * array contains markers consisting of -1 coordinates and is
 * @num_groups elements longer than @segs.
 *
 * Return value: the sorted segs
 **/
BoundSeg *
boundary_sort (const BoundSeg *segs,
               gint            num_segs,
               gint           *num_groups)
{
  Boundary        *boundary;
  const BoundSeg **segs_ptrs_by_xy1;
  const BoundSeg **segs_ptrs_by_xy2;
  gint             index;
  gint             x, y;
  gint             startx, starty;

  g_return_val_if_fail ((segs == NULL && num_segs == 0) ||
                        (segs != NULL && num_segs >  0), NULL);
  g_return_val_if_fail (num_groups != NULL, NULL);

  *num_groups = 0;

  if (num_segs == 0)
    return NULL;

  /* prepare arrays with BoundSeg pointers sorted by xy1 and xy2 accordingly */
  segs_ptrs_by_xy1 = g_new (const BoundSeg *, num_segs);
  segs_ptrs_by_xy2 = g_new (const BoundSeg *, num_segs);

  for (index = 0; index < num_segs; index++)
    {
      segs_ptrs_by_xy1[index] = segs + index;
      segs_ptrs_by_xy2[index] = segs + index;
    }

  qsort (segs_ptrs_by_xy1, num_segs, sizeof (BoundSeg *),
         (GCompareFunc) cmp_segptr_xy1_addr);
  qsort (segs_ptrs_by_xy2, num_segs, sizeof (BoundSeg *),
         (GCompareFunc) cmp_segptr_xy2_addr);

  for (index = 0; index < num_segs; index++)
    ((BoundSeg *) segs)[index].visited = FALSE;

  boundary = boundary_new (NULL);

  for (index = 0; index < num_segs; index++)
    {
      const BoundSeg *cur_seg;

      if (segs[index].visited)
        continue;

      boundary_add_seg (boundary,
                        segs[index].x1, segs[index].y1,
                        segs[index].x2, segs[index].y2,
                        segs[index].open);

      ((BoundSeg *) segs)[index].visited = TRUE;

      startx = segs[index].x1;
      starty = segs[index].y1;
      x = segs[index].x2;
      y = segs[index].y2;

      while ((cur_seg = find_segment (segs_ptrs_by_xy1, segs_ptrs_by_xy2,
                                      num_segs, x, y)) != NULL)
        {
          /*  make sure ordering is correct  */
          if (x == cur_seg->x1 && y == cur_seg->y1)
            {
              boundary_add_seg (boundary,
                                cur_seg->x1, cur_seg->y1,
                                cur_seg->x2, cur_seg->y2,
                                cur_seg->open);
              x = cur_seg->x2;
              y = cur_seg->y2;
            }
          else
            {
              boundary_add_seg (boundary,
                                cur_seg->x2, cur_seg->y2,
                                cur_seg->x1, cur_seg->y1,
                                cur_seg->open);
              x = cur_seg->x1;
              y = cur_seg->y1;
            }

          ((BoundSeg *) cur_seg)->visited = TRUE;
        }

      if (G_UNLIKELY (x != startx || y != starty))
//.........这里部分代码省略.........

static void
gst_pvrvideosink_blit (GstPVRVideoSink * pvrvideosink, GstBuffer * buffer)
{
  PVR2DERROR pvr_error;
  GstDrawContext *dcontext = pvrvideosink->dcontext;
  gint video_width;
  gint video_height;
  gboolean draw_border = FALSE;
  PPVR2D_3DBLT_EXT p_blt_3d;
  PVR2DMEMINFO *src_mem;
  PVR2DFORMAT pvr_format;
  GstVideoRectangle result;
  GstPVRMeta *meta;
  GstVideoCropMeta *cropmeta;

  GST_DEBUG_OBJECT (pvrvideosink, "buffer %p", buffer);

  pvr_format =
      GST_VIDEO_INFO_FORMAT (&pvrvideosink->info) ==
      GST_VIDEO_FORMAT_NV12 ? PVR2D_YUV420_2PLANE : PVR2D_ARGB8888;

  g_mutex_lock (pvrvideosink->flow_lock);
  if (buffer == NULL)
    buffer = pvrvideosink->current_buffer;

  if (buffer == NULL)
    goto done;

  meta = gst_buffer_get_pvr_meta (buffer);
  if (G_UNLIKELY (meta == NULL))
    goto no_pvr_meta;

  src_mem = meta->src_mem;
  p_blt_3d = dcontext->p_blt_info;

  video_width = GST_VIDEO_SINK_WIDTH (pvrvideosink);
  video_height = GST_VIDEO_SINK_HEIGHT (pvrvideosink);

  g_mutex_lock (pvrvideosink->dcontext->x_lock);

  /* Draw borders when displaying the first frame. After this
     draw borders only on expose event or after a size change. */
  if (!(pvrvideosink->current_buffer) || pvrvideosink->redraw_borders) {
    draw_border = TRUE;
  }

  /* Store a reference to the last image we put, lose the previous one */
  if (buffer && pvrvideosink->current_buffer != buffer) {
    if (pvrvideosink->current_buffer) {
      GST_LOG_OBJECT (pvrvideosink, "unreffing %p",
          pvrvideosink->current_buffer);
      gst_buffer_unref (GST_BUFFER_CAST (pvrvideosink->current_buffer));
    }
    GST_LOG_OBJECT (pvrvideosink, "reffing %p as our current buffer", buffer);
    pvrvideosink->current_buffer = gst_buffer_ref (buffer);
  }

  if (pvrvideosink->keep_aspect) {
    GstVideoRectangle src = { 0, };
    GstVideoRectangle dst = { 0, };

    src.w = GST_VIDEO_SINK_WIDTH (pvrvideosink);
    src.h = GST_VIDEO_SINK_HEIGHT (pvrvideosink);
    dst.w = pvrvideosink->render_rect.w;
    dst.h = pvrvideosink->render_rect.h;
    gst_video_sink_center_rect (src, dst, &result, TRUE);
    result.x += pvrvideosink->render_rect.x;
    result.y += pvrvideosink->render_rect.y;
  } else {
    memcpy (&result, &pvrvideosink->render_rect, sizeof (GstVideoRectangle));
  }

  p_blt_3d->sDst.pSurfMemInfo = &dcontext->dst_mem;
  p_blt_3d->sDst.SurfOffset = 0;
  p_blt_3d->sDst.Stride = 4 * pvrvideosink->render_params.ui32Stride;
  p_blt_3d->sDst.Format = PVR2D_ARGB8888;
  p_blt_3d->sDst.SurfWidth = pvrvideosink->xwindow->width;
  p_blt_3d->sDst.SurfHeight = pvrvideosink->xwindow->height;

  p_blt_3d->rcDest.left = result.x;
  p_blt_3d->rcDest.top = result.y;
  p_blt_3d->rcDest.right = result.w + result.x;
  p_blt_3d->rcDest.bottom = result.h + result.y;

  p_blt_3d->sSrc.pSurfMemInfo = src_mem;
  p_blt_3d->sSrc.SurfOffset = 0;
  p_blt_3d->sSrc.Stride = GST_VIDEO_INFO_COMP_STRIDE (&pvrvideosink->info, 0);
  p_blt_3d->sSrc.Format = pvr_format;
  p_blt_3d->sSrc.SurfWidth = video_width;
  p_blt_3d->sSrc.SurfHeight = video_height;

  /* If buffer has crop information, use that */
  if ((cropmeta = gst_buffer_get_video_crop_meta (buffer))) {
    p_blt_3d->rcSource.left = cropmeta->x;
    p_blt_3d->rcSource.top = cropmeta->y;
    p_blt_3d->rcSource.right = cropmeta->x + cropmeta->width;
    p_blt_3d->rcSource.bottom = cropmeta->y + cropmeta->height;
  } else {
    p_blt_3d->rcSource.left = 0;
    p_blt_3d->rcSource.top = 0;
//.........这里部分代码省略.........

void
gst_audio_fx_base_fir_filter_push_residue (GstAudioFXBaseFIRFilter * self)
{
  GstBuffer *outbuf;
  GstFlowReturn res;
  gint rate = GST_AUDIO_FILTER_CAST (self)->format.rate;
  gint channels = GST_AUDIO_FILTER_CAST (self)->format.channels;
  gint width = GST_AUDIO_FILTER_CAST (self)->format.width / 8;
  gint outsize, outsamples;
  guint8 *in, *out;

  if (channels == 0 || rate == 0 || self->nsamples_in == 0) {
    self->buffer_fill = 0;
    g_free (self->buffer);
    self->buffer = NULL;
    return;
  }

  /* Calculate the number of samples and their memory size that
   * should be pushed from the residue */
  outsamples = self->nsamples_in - (self->nsamples_out - self->latency);
  if (outsamples <= 0) {
    self->buffer_fill = 0;
    g_free (self->buffer);
    self->buffer = NULL;
    return;
  }
  outsize = outsamples * channels * width;

  if (!self->fft || self->low_latency) {
    gint64 diffsize, diffsamples;

    /* Process the difference between latency and residue length samples
     * to start at the actual data instead of starting at the zeros before
     * when we only got one buffer smaller than latency */
    diffsamples =
        ((gint64) self->latency) - ((gint64) self->buffer_fill) / channels;
    if (diffsamples > 0) {
      diffsize = diffsamples * channels * width;
      in = g_new0 (guint8, diffsize);
      out = g_new0 (guint8, diffsize);
      self->nsamples_out += self->process (self, in, out, diffsamples);
      g_free (in);
      g_free (out);
    }

    res = gst_pad_alloc_buffer (GST_BASE_TRANSFORM_CAST (self)->srcpad,
        GST_BUFFER_OFFSET_NONE, outsize,
        GST_PAD_CAPS (GST_BASE_TRANSFORM_CAST (self)->srcpad), &outbuf);

    if (G_UNLIKELY (res != GST_FLOW_OK)) {
      GST_WARNING_OBJECT (self, "failed allocating buffer of %d bytes",
          outsize);
      self->buffer_fill = 0;
      return;
    }

    /* Convolve the residue with zeros to get the actual remaining data */
    in = g_new0 (guint8, outsize);
    self->nsamples_out +=
        self->process (self, in, GST_BUFFER_DATA (outbuf), outsamples);
    g_free (in);
  } else {
    guint gensamples = 0;
    guint8 *data;

    outbuf = gst_buffer_new_and_alloc (outsize);
    data = GST_BUFFER_DATA (outbuf);

    while (gensamples < outsamples) {
      guint step_insamples = self->block_length - self->buffer_fill;
      guint8 *zeroes = g_new0 (guint8, step_insamples * channels * width);
      guint8 *out = g_new (guint8, self->block_length * channels * width);
      guint step_gensamples;

      step_gensamples = self->process (self, zeroes, out, step_insamples);
      g_free (zeroes);

      memcpy (data + gensamples * width, out, MIN (step_gensamples,
              outsamples - gensamples) * width);
      gensamples += MIN (step_gensamples, outsamples - gensamples);

      g_free (out);
    }
    self->nsamples_out += gensamples;
  }

  /* Set timestamp, offset, etc from the values we
   * saved when processing the regular buffers */
  if (GST_CLOCK_TIME_IS_VALID (self->start_ts))
    GST_BUFFER_TIMESTAMP (outbuf) = self->start_ts;
  else
    GST_BUFFER_TIMESTAMP (outbuf) = 0;
  GST_BUFFER_TIMESTAMP (outbuf) +=
      gst_util_uint64_scale_int (self->nsamples_out - outsamples -
      self->latency, GST_SECOND, rate);

  GST_BUFFER_DURATION (outbuf) =
      gst_util_uint64_scale_int (outsamples, GST_SECOND, rate);

//.........这里部分代码省略.........

gpointer
nmp_mod_mss_sync_req_2(NmpModMss *self, NmpMsgID msg_id,
       gpointer req, gint req_size, gint *res_size)
{
	gint err = 0;
	NmpMsgErrCode *res_info;
	gpointer res;
	NmpSysMsg *msg;
	G_ASSERT(self != NULL);

	msg = nmp_sysmsg_new_2(msg_id, req, req_size, ++msg_seq_generator);
	if (G_UNLIKELY(!msg))
		return NULL;

    MSG_SET_DSTPOS(msg, BUSSLOT_POS_DBS);
    err = nmp_app_mod_sync_request((NmpAppMod*)self, &msg);
    if (G_UNLIKELY(err))	/* send failed */
    {
        nmp_warning(
        	"<NmpModMss> request cmd %d failed!", msg_id
    );

    nmp_sysmsg_destroy(msg);
    res_info = nmp_mem_kalloc(sizeof(NmpMsgErrCode));
    if (res_info)
    {
    	SET_CODE(res_info, err);
    	*res_size = sizeof(NmpMsgErrCode);
    }

    return res_info;
    }

	if (G_UNLIKELY(!msg))	/* sent, but no response */
	{
		nmp_warning(
			"<NmpModMds> request cmd %d timeout!", msg_id
		);
		res_info = nmp_mem_kalloc(sizeof(NmpMsgErrCode));
		err = -E_TIMEOUT;
		if (res_info)
		{
			SET_CODE(res_info, err);
			*res_size = sizeof(NmpMsgErrCode);
		}

		return res_info;
	}

	res = MSG_GET_DATA(msg);
	if (!res)
	{
		nmp_sysmsg_destroy(msg);
		return NULL;
	}

	res_info = nmp_mem_kalloc(MSG_DATA_SIZE(msg));
	if (G_UNLIKELY(!res_info))
       {
       	nmp_sysmsg_destroy(msg);
       	return NULL;
       }
	*res_size =  MSG_DATA_SIZE(msg);
	memcpy(res_info, res, *res_size);
	nmp_sysmsg_destroy(msg);

	return res_info;
}

static gboolean
mpegts_base_apply_pat (MpegTSBase * base, GstMpegtsSection * section)
{
  GPtrArray *pat = gst_mpegts_section_get_pat (section);
  GPtrArray *old_pat;
  MpegTSBaseProgram *program;
  gint i;

  if (G_UNLIKELY (pat == NULL))
    return FALSE;

  GST_INFO_OBJECT (base, "PAT");

  /* Applying a new PAT does two things:
   * * It adds the new programs to the list of programs this element handles
   *   and increments at the same time the number of times a program is referenced.
   *
   * * If there was a previously active PAT, It decrements the reference count
   *   of all program it used. If a program is no longer needed, it is removed.
   */

  old_pat = base->pat;
  base->pat = pat;

  GST_LOG ("Activating new Program Association Table");
  /* activate the new table */
  for (i = 0; i < pat->len; ++i) {
    GstMpegtsPatProgram *patp = g_ptr_array_index (pat, i);

    program = mpegts_base_get_program (base, patp->program_number);
    if (program) {
      /* IF the program already existed, just check if the PMT PID changed */
      if (program->pmt_pid != patp->network_or_program_map_PID) {
        if (program->pmt_pid != G_MAXUINT16) {
          /* pmt pid changed */
          /* FIXME: when this happens it may still be pmt pid of another
           * program, so setting to False may make it go through expensive
           * path in is_psi unnecessarily */
          MPEGTS_BIT_UNSET (base->known_psi, program->pmt_pid);
        }

        program->pmt_pid = patp->network_or_program_map_PID;
        if (G_UNLIKELY (MPEGTS_BIT_IS_SET (base->known_psi, program->pmt_pid)))
          GST_FIXME
              ("Refcounting issue. Setting twice a PMT PID (0x%04x) as know PSI",
              program->pmt_pid);
        MPEGTS_BIT_SET (base->known_psi, patp->network_or_program_map_PID);
      }
    } else {
      /* Create a new program */
      program =
          mpegts_base_add_program (base, patp->program_number,
          patp->network_or_program_map_PID);
    }
    /* We mark this program as being referenced by one PAT */
    program->patcount += 1;
  }

  if (old_pat) {
    MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base);
    /* deactivate the old table */
    GST_LOG ("Deactivating old Program Association Table");

    for (i = 0; i < old_pat->len; ++i) {
      GstMpegtsPatProgram *patp = g_ptr_array_index (old_pat, i);

      program = mpegts_base_get_program (base, patp->program_number);
      if (G_UNLIKELY (program == NULL)) {
        GST_DEBUG_OBJECT (base, "broken PAT, duplicated entry for program %d",
            patp->program_number);
        continue;
      }

      if (--program->patcount > 0)
        /* the program has been referenced by the new pat, keep it */
        continue;

      GST_INFO_OBJECT (base, "PAT removing program 0x%04x 0x%04x",
          patp->program_number, patp->network_or_program_map_PID);

      if (klass->can_remove_program (base, program)) {
        mpegts_base_deactivate_program (base, program);
        mpegts_base_remove_program (base, patp->program_number);
      } else {
        /* sub-class now owns the program and must call
         * mpegts_base_deactivate_and_free_program later */
        g_hash_table_steal (base->programs,
            GINT_TO_POINTER ((gint) patp->program_number));
      }
      /* FIXME: when this happens it may still be pmt pid of another
       * program, so setting to False may make it go through expensive
       * path in is_psi unnecessarily */
      if (G_UNLIKELY (MPEGTS_BIT_IS_SET (base->known_psi,
                  patp->network_or_program_map_PID))) {
        GST_FIXME
            ("Program refcounting : Setting twice a pid (0x%04x) as known PSI",
            patp->network_or_program_map_PID);
      }
      MPEGTS_BIT_SET (base->known_psi, patp->network_or_program_map_PID);
      mpegts_packetizer_remove_stream (base->packetizer,
//.........这里部分代码省略.........

static gboolean
mpegts_base_apply_pmt (MpegTSBase * base, GstMpegtsSection * section)
{
  const GstMpegtsPMT *pmt;
  MpegTSBaseProgram *program, *old_program;
  guint program_number;
  gboolean initial_program = TRUE;

  pmt = gst_mpegts_section_get_pmt (section);
  if (G_UNLIKELY (pmt == NULL)) {
    GST_ERROR ("Could not get PMT (corrupted ?)");
    return FALSE;
  }

  /* FIXME : not so sure this is valid anymore */
  if (G_UNLIKELY (base->seen_pat == FALSE)) {
    GST_WARNING ("Got pmt without pat first. Returning");
    /* remove the stream since we won't get another PMT otherwise */
    mpegts_packetizer_remove_stream (base->packetizer, section->pid);
    return TRUE;
  }

  program_number = section->subtable_extension;
  GST_DEBUG ("Applying PMT (program_number:%d, pid:0x%04x)",
      program_number, section->pid);

  /* In order for stream switching to happen properly in decodebin(2),
   * we need to first add the new pads (i.e. activate the new program)
   * before removing the old ones (i.e. deactivating the old program)
   */

  old_program = mpegts_base_get_program (base, program_number);
  if (G_UNLIKELY (old_program == NULL))
    goto no_program;

  if (G_UNLIKELY (mpegts_base_is_same_program (base, old_program, section->pid,
              pmt)))
    goto same_program;

  /* If the current program is active, this means we have a new program */
  if (old_program->active) {
    MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base);
    old_program = mpegts_base_steal_program (base, program_number);
    program = mpegts_base_new_program (base, program_number, section->pid);
    program->patcount = old_program->patcount;
    g_hash_table_insert (base->programs,
        GINT_TO_POINTER (program_number), program);

    /* Desactivate the old program */
    /* FIXME : THIS IS BREAKING THE STREAM SWITCHING LOGIC !
     *  */
    if (klass->can_remove_program (base, old_program)) {
      mpegts_base_deactivate_program (base, old_program);
      mpegts_base_free_program (old_program);
    } else {
      /* sub-class now owns the program and must call
       * mpegts_base_deactivate_and_free_program later */
      g_hash_table_steal (base->programs,
          GINT_TO_POINTER ((gint) old_program->program_number));
    }
    initial_program = FALSE;
  } else
    program = old_program;

  /* activate program */
  /* Ownership of pmt_info is given to the program */
  mpegts_base_activate_program (base, program, section->pid, section, pmt,
      initial_program);

  return TRUE;

no_program:
  {
    GST_ERROR ("Attempted to apply a PMT on a program that wasn't created");
    return TRUE;
  }

same_program:
  {
    GST_DEBUG ("Not applying identical program");
    return TRUE;
  }
}

static void
mpegts_base_activate_program (MpegTSBase * base, MpegTSBaseProgram * program,
    guint16 pmt_pid, GstMpegtsSection * section, const GstMpegtsPMT * pmt,
    gboolean initial_program)
{
  guint i;
  MpegTSBaseClass *klass;

  if (G_UNLIKELY (program->active))
    return;

  GST_DEBUG ("Activating program %d", program->program_number);

  /* activate new pmt */
  if (program->section)
    gst_mpegts_section_unref (program->section);
  program->section = gst_mpegts_section_ref (section);

  program->pmt = pmt;
  program->pmt_pid = pmt_pid;
  program->pcr_pid = pmt->pcr_pid;

  /* extract top-level registration_id if present */
  program->registration_id =
      get_registration_from_descriptors (pmt->descriptors);
  GST_DEBUG ("program 0x%04x, registration_id %" SAFE_FOURCC_FORMAT,
      program->program_number, SAFE_FOURCC_ARGS (program->registration_id));

  for (i = 0; i < pmt->streams->len; ++i) {
    GstMpegtsPMTStream *stream = g_ptr_array_index (pmt->streams, i);

    switch (stream->stream_type) {
      case GST_MPEGTS_STREAM_TYPE_SCTE_DSMCC_DCB:
      case GST_MPEGTS_STREAM_TYPE_SCTE_SIGNALING:
      {
        guint32 registration_id =
            get_registration_from_descriptors (stream->descriptors);
        /* Not a private section stream */
        if (registration_id != DRF_ID_CUEI && registration_id != DRF_ID_ETV1)
          break;
        /* Fall through on purpose - remove this PID from known_psi */
      }
      case GST_MPEGTS_STREAM_TYPE_PRIVATE_SECTIONS:
      case GST_MPEGTS_STREAM_TYPE_MHEG:
      case GST_MPEGTS_STREAM_TYPE_DSM_CC:
      case GST_MPEGTS_STREAM_TYPE_DSMCC_A:
      case GST_MPEGTS_STREAM_TYPE_DSMCC_B:
      case GST_MPEGTS_STREAM_TYPE_DSMCC_C:
      case GST_MPEGTS_STREAM_TYPE_DSMCC_D:
      case GST_MPEGTS_STREAM_TYPE_SL_FLEXMUX_SECTIONS:
      case GST_MPEGTS_STREAM_TYPE_METADATA_SECTIONS:
        /* Set known PSI streams */
        if (base->parse_private_sections)
          MPEGTS_BIT_SET (base->known_psi, stream->pid);
        break;
      default:
        if (G_UNLIKELY (MPEGTS_BIT_IS_SET (base->is_pes, stream->pid)))
          GST_FIXME
              ("Refcounting issue. Setting twice a PID (0x%04x) as known PES",
              stream->pid);
        if (G_UNLIKELY (MPEGTS_BIT_IS_SET (base->known_psi, stream->pid))) {
          GST_FIXME
              ("Refcounting issue. Setting a known PSI PID (0x%04x) as known PES",
              stream->pid);
          MPEGTS_BIT_UNSET (base->known_psi, stream->pid);
        }

        MPEGTS_BIT_SET (base->is_pes, stream->pid);
        break;
    }
    mpegts_base_program_add_stream (base, program,
        stream->pid, stream->stream_type, stream);

  }
  /* We add the PCR pid last. If that PID is already used by one of the media
   * streams above, no new stream will be created */
  mpegts_base_program_add_stream (base, program, pmt->pcr_pid, -1, NULL);
  MPEGTS_BIT_SET (base->is_pes, pmt->pcr_pid);

  program->active = TRUE;
  program->initial_program = initial_program;

  klass = GST_MPEGTS_BASE_GET_CLASS (base);
  if (klass->program_started != NULL)
    klass->program_started (base, program);

  GST_DEBUG_OBJECT (base, "new pmt activated");
}

static void
mpegts_base_deactivate_program (MpegTSBase * base, MpegTSBaseProgram * program)
{
  gint i;
  MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base);

  if (G_UNLIKELY (program->active == FALSE))
    return;

  GST_DEBUG_OBJECT (base, "Deactivating PMT");

  program->active = FALSE;

  if (program->pmt) {
    for (i = 0; i < program->pmt->streams->len; ++i) {
      GstMpegtsPMTStream *stream = g_ptr_array_index (program->pmt->streams, i);

      mpegts_base_program_remove_stream (base, program, stream->pid);

      /* Only unset the is_pes/known_psi bit if the PID isn't used in any other active
       * program */
      if (!mpegts_pid_in_active_programs (base, stream->pid)) {
        switch (stream->stream_type) {
          case GST_MPEGTS_STREAM_TYPE_SCTE_DSMCC_DCB:
          case GST_MPEGTS_STREAM_TYPE_SCTE_SIGNALING:
          {
            guint32 registration_id =
                get_registration_from_descriptors (stream->descriptors);

            /* Not a private section stream */
            if (registration_id != DRF_ID_CUEI
                && registration_id != DRF_ID_ETV1)
              break;
            /* Fall through on purpose - remove this PID from known_psi */
          }
          case GST_MPEGTS_STREAM_TYPE_PRIVATE_SECTIONS:
          case GST_MPEGTS_STREAM_TYPE_MHEG:
          case GST_MPEGTS_STREAM_TYPE_DSM_CC:
          case GST_MPEGTS_STREAM_TYPE_DSMCC_A:
          case GST_MPEGTS_STREAM_TYPE_DSMCC_B:
          case GST_MPEGTS_STREAM_TYPE_DSMCC_C:
          case GST_MPEGTS_STREAM_TYPE_DSMCC_D:
          case GST_MPEGTS_STREAM_TYPE_SL_FLEXMUX_SECTIONS:
          case GST_MPEGTS_STREAM_TYPE_METADATA_SECTIONS:
            /* Set known PSI streams */
            if (base->parse_private_sections)
              MPEGTS_BIT_UNSET (base->known_psi, stream->pid);
            break;
          default:
            MPEGTS_BIT_UNSET (base->is_pes, stream->pid);
            break;
        }
      }
    }

    /* remove pcr stream */
    /* FIXME : This might actually be shared with another stream ? */
    mpegts_base_program_remove_stream (base, program, program->pcr_pid);
    if (!mpegts_pid_in_active_programs (base, program->pcr_pid))
      MPEGTS_BIT_UNSET (base->is_pes, program->pcr_pid);

    GST_DEBUG ("program stream_list is now %p", program->stream_list);
  }

  /* Inform subclasses we're deactivating this program */
  if (klass->program_stopped)
    klass->program_stopped (base, program);
}

gboolean
mpegts_base_handle_seek_event (MpegTSBase * base, GstPad * pad,
    GstEvent * event)
{
  MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base);
  GstFlowReturn ret = GST_FLOW_ERROR;
  gdouble rate;
  gboolean flush;
  GstFormat format;
  GstSeekFlags flags;
  GstSeekType start_type, stop_type;
  gint64 start, stop;
  GstEvent *flush_event = NULL;

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

  if (format != GST_FORMAT_TIME)
    return FALSE;

  if (GST_EVENT_SEQNUM (event) == base->last_seek_seqnum) {
    GST_DEBUG_OBJECT (base, "Skipping already handled seek");
    return TRUE;
  }

  if (base->mode == BASE_MODE_PUSHING) {
    /* First try if upstream supports seeking in TIME format */
    if (gst_pad_push_event (base->sinkpad, gst_event_ref (event))) {
      GST_DEBUG ("upstream handled SEEK event");
      return TRUE;
    }

    /* If the subclass can seek, do that */
    if (klass->seek) {
      ret = klass->seek (base, event);
      if (G_UNLIKELY (ret != GST_FLOW_OK))
        GST_WARNING ("seeking failed %s", gst_flow_get_name (ret));
      else {
        GstEvent *new_seek;

        if (GST_CLOCK_TIME_IS_VALID (base->seek_offset)) {
          base->mode = BASE_MODE_SEEKING;
          new_seek = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
              GST_SEEK_TYPE_SET, base->seek_offset, GST_SEEK_TYPE_NONE, -1);
          gst_event_set_seqnum (new_seek, GST_EVENT_SEQNUM (event));
          if (!gst_pad_push_event (base->sinkpad, new_seek))
            ret = GST_FLOW_ERROR;
          else
            base->last_seek_seqnum = GST_EVENT_SEQNUM (event);
        }
        base->mode = BASE_MODE_PUSHING;
      }
    } else {
      GST_WARNING ("subclass has no seek implementation");
    }

    return ret == GST_FLOW_OK;
  }

  if (!klass->seek) {
    GST_WARNING ("subclass has no seek implementation");
    return FALSE;
  }

  if (rate <= 0.0) {
    GST_WARNING ("Negative rate not supported");
    return FALSE;
  }

  GST_DEBUG ("seek event, rate: %f start: %" GST_TIME_FORMAT
      " stop: %" GST_TIME_FORMAT, rate, GST_TIME_ARGS (start),
      GST_TIME_ARGS (stop));

  flush = flags & GST_SEEK_FLAG_FLUSH;

  /* stop streaming, either by flushing or by pausing the task */
  base->mode = BASE_MODE_SEEKING;
  if (flush) {
    GST_DEBUG_OBJECT (base, "sending flush start");
    flush_event = gst_event_new_flush_start ();
    gst_event_set_seqnum (flush_event, GST_EVENT_SEQNUM (event));
    gst_pad_push_event (base->sinkpad, gst_event_ref (flush_event));
    GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, flush_event);
  } else
    gst_pad_pause_task (base->sinkpad);

  /* wait for streaming to finish */
  GST_PAD_STREAM_LOCK (base->sinkpad);

  if (flush) {
    /* send a FLUSH_STOP for the sinkpad, since we need data for seeking */
    GST_DEBUG_OBJECT (base, "sending flush stop");
    flush_event = gst_event_new_flush_stop (TRUE);
    gst_event_set_seqnum (flush_event, GST_EVENT_SEQNUM (event));

    /* ref for it to be reused later */
    gst_pad_push_event (base->sinkpad, gst_event_ref (flush_event));
    /* And actually flush our pending data but allow to preserve some info
     * to perform the seek */
    mpegts_base_flush (base, FALSE);
//.........这里部分代码省略.........

gboolean
r_parser_ipv6(gchar *str, gint *len, const gchar *param, gpointer state, RParserMatch *match)
{
  gint colons = 0;
  gint dots = 0;
  gint octet = 0;
  gint digit = 16;
  gboolean shortened = FALSE;

  *len = 0;

  while (1)
    {
      if (str[*len] == ':')
        {
          if (G_UNLIKELY(octet > 0xffff || (octet == -1 && shortened)))
            return FALSE;

          if (G_UNLIKELY(colons == 7 || dots == 3))
            break;

          if (G_UNLIKELY(digit == 10))
            return FALSE;

          if (octet == -1)
            shortened = TRUE;

          colons++;
          octet = -1;
        }
      else if (g_ascii_isxdigit(str[*len]))
        {
          if (octet == -1)
            octet = 0;
          else
            octet *= digit;

          octet += g_ascii_xdigit_value(str[*len]);
        }
      else if (str[*len] == '.')
        {
          if (G_UNLIKELY((digit == 10 && octet > 255)))
            return FALSE;

          if (G_UNLIKELY((digit == 16 && octet > 597) || octet == -1 || colons == 7 || dots == 3))
            break;

          dots++;
          octet = -1;
          digit = 10;
        }
      else
        break;

      (*len)++;
    }

  if (G_UNLIKELY(*len > 0 && str[*len-1] == '.'))
    {
      (*len)--;
      dots--;
    }
  else if (G_UNLIKELY(*len > 1 && str[*len-1] == ':' && str[*len - 2] != ':'))
    {
      (*len)--;
      colons--;
    }

  if (colons < 2 || colons > 7 || (digit == 10 && octet > 255) || (digit == 16 && octet > 0xffff) ||
      !(dots == 0 || dots == 3) || (!shortened && colons < 7 && dots == 0))
    return FALSE;

  return TRUE;
}

static gboolean
gst_kate_enc_sink_event (GstPad * pad, GstEvent * event)
{
  GstKateEnc *ke = GST_KATE_ENC (gst_pad_get_parent (pad));
  GstStructure *structure;
  gboolean ret;

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_NEWSEGMENT:
      GST_LOG_OBJECT (ke, "Got newsegment event");
      if (ke->initialized) {
        GST_LOG_OBJECT (ke, "ensuring all headers are in");
        if (gst_kate_enc_flush_headers (ke) != GST_FLOW_OK) {
          GST_WARNING_OBJECT (ke, "Failed to flush headers");
        } else {
          GstFormat format;
          gint64 timestamp;

          gst_event_parse_new_segment (event, NULL, NULL, &format, &timestamp,
              NULL, NULL);
          if (format != GST_FORMAT_TIME || !GST_CLOCK_TIME_IS_VALID (timestamp)) {
            GST_WARNING_OBJECT (ke,
                "No time in newsegment event %p, format %d, timestamp %"
                G_GINT64_FORMAT, event, (int) format, timestamp);
            /* to be safe, we'd need to generate a keepalive anyway, but we'd have to guess at the timestamp to use; a
               good guess would be the last known timestamp plus the keepalive time, but if we then get a packet with a
               timestamp less than this, it would fail to encode, which would be Bad. If we don't encode a keepalive, we
               run the risk of stalling the pipeline and hanging, which is Very Bad. Oh dear. We can't exit(-1), can we ? */
          } else {
            float t = timestamp / (double) GST_SECOND;

            if (ke->delayed_spu
                && t - ke->delayed_start / (double) GST_SECOND >=
                ke->default_spu_duration) {
              if (G_UNLIKELY (gst_kate_enc_flush_waiting (ke,
                          timestamp) != GST_FLOW_OK)) {
                GST_WARNING_OBJECT (ke, "Failed to encode delayed packet");
                /* continue with new segment handling anyway */
              }
            }

            GST_LOG_OBJECT (ke, "ts %f, last %f (min %f)", t,
                ke->last_timestamp / (double) GST_SECOND,
                ke->keepalive_min_time);
            if (ke->keepalive_min_time > 0.0f
                && t - ke->last_timestamp / (double) GST_SECOND >=
                ke->keepalive_min_time) {
              /* we only generate a keepalive if there is no SPU waiting, as it would
                 mean out of sequence start times - and granulepos */
              if (!ke->delayed_spu) {
                gst_kate_enc_generate_keepalive (ke, timestamp);
              }
            }
          }
        }
      }
      ret = gst_pad_push_event (ke->srcpad, event);
      break;

    case GST_EVENT_CUSTOM_DOWNSTREAM:
      GST_LOG_OBJECT (ke, "Got custom downstream event");
      /* adapted from the dvdsubdec element */
      structure = event->structure;
      if (structure != NULL
          && gst_structure_has_name (structure, "application/x-gst-dvd")) {
        if (ke->initialized) {
          GST_LOG_OBJECT (ke, "ensuring all headers are in");
          if (gst_kate_enc_flush_headers (ke) != GST_FLOW_OK) {
            GST_WARNING_OBJECT (ke, "Failed to flush headers");
          } else {
            const gchar *event_name =
                gst_structure_get_string (structure, "event");
            if (event_name) {
              if (!strcmp (event_name, "dvd-spu-clut-change")) {
                gchar name[16];
                int idx;
                gboolean found;
                gint value;
                GST_INFO_OBJECT (ke, "New CLUT received");
                for (idx = 0; idx < 16; ++idx) {
                  g_snprintf (name, sizeof (name), "clut%02d", idx);
                  found = gst_structure_get_int (structure, name, &value);
                  if (found) {
                    ke->spu_clut[idx] = value;
                  } else {
                    GST_WARNING_OBJECT (ke,
                        "DVD CLUT event did not contain %s field", name);
                  }
                }
              } else if (!strcmp (event_name, "dvd-lang-codes")) {
                /* we can't know which stream corresponds to us */
              }
            } else {
              GST_WARNING_OBJECT (ke, "custom downstream event with no name");
            }
          }
        }
      }
      ret = gst_pad_push_event (ke->srcpad, event);
      break;
//.........这里部分代码省略.........

static gboolean
_cogl_pipeline_fragend_fixed_add_layer (CoglPipeline *pipeline,
                                        CoglPipelineLayer *layer,
                                        unsigned long layers_difference)
{
  CoglTextureUnit *unit =
    _cogl_get_texture_unit (_cogl_pipeline_layer_get_unit_index (layer));
  int unit_index = unit->index;
  int n_rgb_func_args;
  int n_alpha_func_args;

  _COGL_GET_CONTEXT (ctx, FALSE);

  /* XXX: Beware that since we are changing the active texture unit we
   * must make sure we don't call into other Cogl components that may
   * temporarily bind texture objects to query/modify parameters since
   * they will end up binding texture unit 1. See
   * _cogl_bind_gl_texture_transient for more details.
   */
  _cogl_set_active_texture_unit (unit_index);

  if (G_UNLIKELY (unit_index >= get_max_texture_units ()))
    {
      _cogl_disable_texture_unit (unit_index);
      /* TODO: although this isn't considered an error that
       * warrants falling back to a different backend we
       * should print a warning here. */
      return TRUE;
    }

  /* Handle enabling or disabling the right texture target */
  if (layers_difference & COGL_PIPELINE_LAYER_STATE_TEXTURE_TARGET)
    {
      CoglPipelineLayer *tex_authority =
        _cogl_pipeline_layer_get_authority (layer,
                                            COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA);
      CoglPipelineLayer *target_authority =
        _cogl_pipeline_layer_get_authority (layer,
                                            COGL_PIPELINE_LAYER_STATE_TEXTURE_TARGET);
      /* XXX: currently layers with no associated texture fallback to
       * using ctx->default_gl_texture_2d_tex so they have a texture
       * target of GL_TEXTURE_2D */
      GLenum gl_target =
        tex_authority->texture ? target_authority->target : GL_TEXTURE_2D;

      _cogl_set_active_texture_unit (unit_index);

      /* The common GL code handles binding the right texture so we
         just need to handle enabling and disabling it */

      if (unit->enabled_gl_target != gl_target)
        {
          /* Disable the previous target if it's still enabled */
          if (unit->enabled_gl_target)
            GE (ctx, glDisable (unit->enabled_gl_target));

          /* Enable the new target */
          if (!G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_TEXTURING)))
            {
              GE (ctx, glEnable (gl_target));
              unit->enabled_gl_target = gl_target;
            }
        }
    }
  else
    {
      /* Even though there may be no difference between the last flushed
       * texture state and the current layers texture state it may be that the
       * texture unit has been disabled for some time so we need to assert that
       * it's enabled now.
       */
      if (!G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_TEXTURING)) &&
          unit->enabled_gl_target == 0)
        {
          _cogl_set_active_texture_unit (unit_index);
          GE (ctx, glEnable (unit->gl_target));
          unit->enabled_gl_target = unit->gl_target;
        }
    }

  if (layers_difference & COGL_PIPELINE_LAYER_STATE_COMBINE)
    {
      CoglPipelineLayer *authority =
        _cogl_pipeline_layer_get_authority (layer,
                                            COGL_PIPELINE_LAYER_STATE_COMBINE);
      CoglPipelineLayerBigState *big_state = authority->big_state;

      GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE));

      /* Set the combiner functions... */
      GE (ctx, glTexEnvi (GL_TEXTURE_ENV,
                          GL_COMBINE_RGB,
                          big_state->texture_combine_rgb_func));
      GE (ctx, glTexEnvi (GL_TEXTURE_ENV,
                          GL_COMBINE_ALPHA,
                          big_state->texture_combine_alpha_func));

      /*
       * Setup the function arguments...
       */
//.........这里部分代码省略.........