C++ (Cpp) gst_raw_parse_push_buffer Exemples

Exemple #1

Fichier : gstrawparse.c Projet : Distrotech/gst-plugins-bad

static GstFlowReturn
gst_raw_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
  GstRawParse *rp = GST_RAW_PARSE (parent);
  GstFlowReturn ret = GST_FLOW_OK;
  GstRawParseClass *rp_class = GST_RAW_PARSE_GET_CLASS (rp);
  guint buffersize, available;

  if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
    GST_DEBUG_OBJECT (rp, "received DISCONT buffer");
    gst_adapter_clear (rp->adapter);
    rp->discont = TRUE;
  }

  if (!gst_raw_parse_set_src_caps (rp))
    goto no_caps;

  if (rp->start_segment) {
    GST_DEBUG_OBJECT (rp, "sending start segment");
    gst_pad_push_event (rp->srcpad, rp->start_segment);
    rp->start_segment = NULL;
  }

  gst_adapter_push (rp->adapter, buffer);

  available = gst_adapter_available (rp->adapter);
  if (rp_class->multiple_frames_per_buffer) {
    buffersize = available;
    buffersize -= buffersize % rp->framesize;
  } else {
    buffersize = rp->framesize;
  }

  while (buffersize > 0 && gst_adapter_available (rp->adapter) >= buffersize) {
    buffer = gst_adapter_take_buffer (rp->adapter, buffersize);

    ret = gst_raw_parse_push_buffer (rp, buffer);
    if (ret != GST_FLOW_OK)
      break;
  }
done:

  return ret;

  /* ERRORS */
no_caps:
  {
    GST_ERROR_OBJECT (rp, "could not set caps");
    ret = GST_FLOW_NOT_NEGOTIATED;
    goto done;
  }
}

Exemple #2

Fichier : gstrawparse.c Projet : lubing521/gst-embedded-builder

static void
gst_raw_parse_loop (GstElement * element)
{
  GstRawParse *rp = GST_RAW_PARSE (element);
  GstRawParseClass *rp_class = GST_RAW_PARSE_GET_CLASS (rp);
  GstFlowReturn ret;
  GstBuffer *buffer;
  gint size;

  if (!gst_raw_parse_set_src_caps (rp))
    goto no_caps;

  if (rp->start_segment) {
    GST_DEBUG_OBJECT (rp, "sending start segment");
    gst_pad_push_event (rp->srcpad, rp->start_segment);
    rp->start_segment = NULL;
  }

  if (rp_class->multiple_frames_per_buffer && rp->framesize < 4096)
    size = 4096 - (4096 % rp->framesize);
  else
    size = rp->framesize;

  if (rp->segment.rate >= 0) {
    if (rp->offset + size > rp->upstream_length) {
      GstFormat fmt = GST_FORMAT_BYTES;

      if (!gst_pad_peer_query_duration (rp->sinkpad, fmt, &rp->upstream_length)) {
        GST_WARNING_OBJECT (rp,
            "Could not get upstream duration, trying to pull frame by frame");
        size = rp->framesize;
      } else if (rp->upstream_length < rp->offset + rp->framesize) {
        ret = GST_FLOW_EOS;
        goto pause;
      } else if (rp->offset + size > rp->upstream_length) {
        size = rp->upstream_length - rp->offset;
        size -= size % rp->framesize;
      }
    }
  } else {
    if (rp->offset == 0) {
      ret = GST_FLOW_EOS;
      goto pause;
    } else if (rp->offset < size) {
      size -= rp->offset;
    }
    rp->offset -= size;
  }

  buffer = NULL;
  ret = gst_pad_pull_range (rp->sinkpad, rp->offset, size, &buffer);

  if (ret != GST_FLOW_OK) {
    GST_DEBUG_OBJECT (rp, "pull_range (%" G_GINT64_FORMAT ", %u) "
        "failed, flow: %s", rp->offset, size, gst_flow_get_name (ret));
    buffer = NULL;
    goto pause;
  }

  if (gst_buffer_get_size (buffer) < size) {
    GST_DEBUG_OBJECT (rp, "Short read at offset %" G_GINT64_FORMAT
        ", got only %" G_GSIZE_FORMAT " of %u bytes", rp->offset,
        gst_buffer_get_size (buffer), size);

    if (size > rp->framesize) {
      gst_buffer_set_size (buffer, gst_buffer_get_size (buffer) -
          gst_buffer_get_size (buffer) % rp->framesize);
    } else {
      gst_buffer_unref (buffer);
      buffer = NULL;
      ret = GST_FLOW_EOS;
      goto pause;
    }
  }

  ret = gst_raw_parse_push_buffer (rp, buffer);
  if (ret != GST_FLOW_OK)
    goto pause;

  return;

  /* ERRORS */
no_caps:
  {
    GST_ERROR_OBJECT (rp, "could not negotiate caps");
    ret = GST_FLOW_NOT_NEGOTIATED;
    goto pause;
  }
pause:
  {
    const gchar *reason = gst_flow_get_name (ret);

    GST_LOG_OBJECT (rp, "pausing task, reason %s", reason);
    gst_pad_pause_task (rp->sinkpad);

    if (ret == GST_FLOW_EOS) {
      if (rp->segment.flags & GST_SEEK_FLAG_SEGMENT) {
        GstClockTime stop;

        GST_LOG_OBJECT (rp, "Sending segment done");

        if ((stop = rp->segment.stop) == -1)
          stop = rp->segment.duration;

        gst_element_post_message (GST_ELEMENT_CAST (rp),
            gst_message_new_segment_done (GST_OBJECT_CAST (rp),
                rp->segment.format, stop));
        gst_pad_push_event (rp->srcpad,
            gst_event_new_segment_done (rp->segment.format, stop));
      } else {
        GST_LOG_OBJECT (rp, "Sending EOS, at end of stream");
        gst_pad_push_event (rp->srcpad, gst_event_new_eos ());
      }
    } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
      GST_ELEMENT_ERROR (rp, STREAM, FAILED,
          ("Internal data stream error."),
          ("stream stopped, reason %s", reason));
      gst_pad_push_event (rp->srcpad, gst_event_new_eos ());
    }
    return;
  }
}