C++ GST_ERROR_OBJECT函数代码示例

//.........这里部分代码省略.........
                    memcpy (GST_BUFFER_DATA (buf), omx_buffer->pBuffer + omx_buffer->nOffset, omx_buffer->nFilledLen);
                    if (self->use_timestamps)
                    {
                        GST_BUFFER_TIMESTAMP (buf) = gst_util_uint64_scale_int (omx_buffer->nTimeStamp,
                                                                                GST_SECOND,
                                                                                OMX_TICKS_PER_SECOND);
                    }

                    if (self->share_output_buffer)
                    {
                        GST_WARNING_OBJECT (self, "couldn't zero-copy");
                        /* If pAppPrivate is NULL, it means it was a dummy
                         * allocation, free it. */
                        if (!omx_buffer->pAppPrivate)
                        {
                            g_free (omx_buffer->pBuffer);
                            omx_buffer->pBuffer = NULL;
                        }
                    }

                    ret = push_buffer (self, buf);
                }
                else
                {
                    GST_WARNING_OBJECT (self, "couldn't allocate buffer of size %" G_GUINT32_FORMAT,
                                        omx_buffer->nFilledLen);
                }
            }
        }
        else
        {
            GST_WARNING_OBJECT (self, "empty buffer");
        }

        if (G_UNLIKELY (omx_buffer->nFlags & OMX_BUFFERFLAG_EOS))
        {
            GST_DEBUG_OBJECT (self, "got eos");
            gst_pad_push_event (self->srcpad, gst_event_new_eos ());
            ret = GST_FLOW_UNEXPECTED;
            goto leave;
        }

        if (self->share_output_buffer &&
            !omx_buffer->pBuffer &&
            omx_buffer->nOffset == 0)
        {
            GstBuffer *buf;
            GstFlowReturn result;

            GST_LOG_OBJECT (self, "allocate buffer");
            result = gst_pad_alloc_buffer_and_set_caps (self->srcpad,
                                                        GST_BUFFER_OFFSET_NONE,
                                                        omx_buffer->nAllocLen,
                                                        GST_PAD_CAPS (self->srcpad),
                                                        &buf);

            if (G_LIKELY (result == GST_FLOW_OK))
            {
                gst_buffer_ref (buf);
                omx_buffer->pAppPrivate = buf;

                omx_buffer->pBuffer = GST_BUFFER_DATA (buf);
                omx_buffer->nAllocLen = GST_BUFFER_SIZE (buf);
            }
            else
            {
                GST_WARNING_OBJECT (self, "could not pad allocate buffer, using malloc");
                omx_buffer->pBuffer = g_malloc (omx_buffer->nAllocLen);
            }
        }

        if (self->share_output_buffer &&
            !omx_buffer->pBuffer)
        {
            GST_ERROR_OBJECT (self, "no input buffer to share");
        }

        omx_buffer->nFilledLen = 0;
        GST_LOG_OBJECT (self, "release_buffer");
        g_omx_port_release_buffer (out_port, omx_buffer);
    }

leave:

    self->last_pad_push_return = ret;

    if (gomx->omx_error != OMX_ErrorNone)
        ret = GST_FLOW_ERROR;

    if (ret != GST_FLOW_OK)
    {
        GST_INFO_OBJECT (self, "pause task, reason:  %s",
                         gst_flow_get_name (ret));
        gst_pad_pause_task (self->srcpad);
    }

    GST_LOG_OBJECT (self, "end");

    gst_object_unref (self);
}

static void
gst_omx_audio_dec_loop (GstOMXAudioDec * self)
{
  GstOMXPort *port = self->dec_out_port;
  GstOMXBuffer *buf = NULL;
  GstFlowReturn flow_ret = GST_FLOW_OK;
  GstOMXAcquireBufferReturn acq_return;
  OMX_ERRORTYPE err;

  acq_return = gst_omx_port_acquire_buffer (port, &buf);
  if (acq_return == GST_OMX_ACQUIRE_BUFFER_ERROR) {
    goto component_error;
  } else if (acq_return == GST_OMX_ACQUIRE_BUFFER_FLUSHING) {
    goto flushing;
  } else if (acq_return == GST_OMX_ACQUIRE_BUFFER_EOS) {
    goto eos;
  }

  if (!gst_pad_has_current_caps (GST_AUDIO_DECODER_SRC_PAD (self)) ||
      acq_return == GST_OMX_ACQUIRE_BUFFER_RECONFIGURE) {
    OMX_PARAM_PORTDEFINITIONTYPE port_def;
    OMX_AUDIO_PARAM_PCMMODETYPE pcm_param;
    GstAudioChannelPosition omx_position[OMX_AUDIO_MAXCHANNELS];
    GstOMXAudioDecClass *klass = GST_OMX_AUDIO_DEC_GET_CLASS (self);
    gint i;

    GST_DEBUG_OBJECT (self, "Port settings have changed, updating caps");

    /* Reallocate all buffers */
    if (acq_return == GST_OMX_ACQUIRE_BUFFER_RECONFIGURE
        && gst_omx_port_is_enabled (port)) {
      err = gst_omx_port_set_enabled (port, FALSE);
      if (err != OMX_ErrorNone)
        goto reconfigure_error;

      err = gst_omx_port_wait_buffers_released (port, 5 * GST_SECOND);
      if (err != OMX_ErrorNone)
        goto reconfigure_error;

      err = gst_omx_port_deallocate_buffers (port);
      if (err != OMX_ErrorNone)
        goto reconfigure_error;

      err = gst_omx_port_wait_enabled (port, 1 * GST_SECOND);
      if (err != OMX_ErrorNone)
        goto reconfigure_error;
    }

    /* Just update caps */
    GST_AUDIO_DECODER_STREAM_LOCK (self);

    gst_omx_port_get_port_definition (port, &port_def);
    g_assert (port_def.format.audio.eEncoding == OMX_AUDIO_CodingPCM);

    GST_OMX_INIT_STRUCT (&pcm_param);
    pcm_param.nPortIndex = self->dec_out_port->index;
    err =
        gst_omx_component_get_parameter (self->dec, OMX_IndexParamAudioPcm,
        &pcm_param);
    if (err != OMX_ErrorNone) {
      GST_ERROR_OBJECT (self, "Failed to get PCM parameters: %s (0x%08x)",
          gst_omx_error_to_string (err), err);
      goto caps_failed;
    }

    g_assert (pcm_param.ePCMMode == OMX_AUDIO_PCMModeLinear);
    g_assert (pcm_param.bInterleaved == OMX_TRUE);

    gst_audio_info_init (&self->info);

    for (i = 0; i < pcm_param.nChannels; i++) {
      switch (pcm_param.eChannelMapping[i]) {
        case OMX_AUDIO_ChannelLF:
          omx_position[i] = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
          break;
        case OMX_AUDIO_ChannelRF:
          omx_position[i] = GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT;
          break;
        case OMX_AUDIO_ChannelCF:
          omx_position[i] = GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER;
          break;
        case OMX_AUDIO_ChannelLS:
          omx_position[i] = GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT;
          break;
        case OMX_AUDIO_ChannelRS:
          omx_position[i] = GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT;
          break;
        case OMX_AUDIO_ChannelLFE:
          omx_position[i] = GST_AUDIO_CHANNEL_POSITION_LFE1;
          break;
        case OMX_AUDIO_ChannelCS:
          omx_position[i] = GST_AUDIO_CHANNEL_POSITION_REAR_CENTER;
          break;
        case OMX_AUDIO_ChannelLR:
          omx_position[i] = GST_AUDIO_CHANNEL_POSITION_REAR_LEFT;
          break;
        case OMX_AUDIO_ChannelRR:
          omx_position[i] = GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT;
          break;
        case OMX_AUDIO_ChannelNone:
//.........这里部分代码省略.........

static gboolean
gst_decklink_video_src_set_caps (GstBaseSrc * bsrc, GstCaps * caps)
{
  GstDecklinkVideoSrc *self = GST_DECKLINK_VIDEO_SRC_CAST (bsrc);
  GstCaps *current_caps;
  const GstDecklinkMode *mode;
  BMDVideoInputFlags flags;
  HRESULT ret;

  GST_DEBUG_OBJECT (self, "Setting caps %" GST_PTR_FORMAT, caps);

  if ((current_caps = gst_pad_get_current_caps (GST_BASE_SRC_PAD (bsrc)))) {
    GST_DEBUG_OBJECT (self, "Pad already has caps %" GST_PTR_FORMAT, caps);

    if (!gst_caps_is_equal (caps, current_caps)) {
      GST_DEBUG_OBJECT (self, "New caps, reconfiguring");
      gst_caps_unref (current_caps);
      if (self->mode == GST_DECKLINK_MODE_AUTO) {
        return TRUE;
      } else {
        return FALSE;
      }
    } else {
      gst_caps_unref (current_caps);
      return TRUE;
    }
  }

  if (!gst_video_info_from_caps (&self->info, caps))
    return FALSE;

  if (self->input->config && self->connection != GST_DECKLINK_CONNECTION_AUTO) {
    ret = self->input->config->SetInt (bmdDeckLinkConfigVideoInputConnection,
        gst_decklink_get_connection (self->connection));
    if (ret != S_OK) {
      GST_ERROR_OBJECT (self, "Failed to set configuration (input source)");
      return FALSE;
    }

    if (self->connection == GST_DECKLINK_CONNECTION_COMPOSITE) {
      ret = self->input->config->SetInt (bmdDeckLinkConfigAnalogVideoInputFlags,
          bmdAnalogVideoFlagCompositeSetup75);
      if (ret != S_OK) {
        GST_ERROR_OBJECT (self,
            "Failed to set configuration (composite setup)");
        return FALSE;
      }
    }
  }

  flags = bmdVideoInputFlagDefault;
  if (self->mode == GST_DECKLINK_MODE_AUTO) {
    bool autoDetection = false;

    if (self->input->attributes) {
      ret =
          self->input->
          attributes->GetFlag (BMDDeckLinkSupportsInputFormatDetection,
          &autoDetection);
      if (ret != S_OK) {
        GST_ERROR_OBJECT (self, "Failed to get attribute (autodetection)");
        return FALSE;
      }
      if (autoDetection)
        flags |= bmdVideoInputEnableFormatDetection;
    }
    if (!autoDetection) {
      GST_ERROR_OBJECT (self, "Failed to activate auto-detection");
      return FALSE;
    }
  }

  mode = gst_decklink_get_mode (self->mode);
  g_assert (mode != NULL);

  ret = self->input->input->EnableVideoInput (mode->mode,
      bmdFormat8BitYUV, flags);
  if (ret != S_OK) {
    GST_WARNING_OBJECT (self, "Failed to enable video input");
    return FALSE;
  }

  g_mutex_lock (&self->input->lock);
  self->input->mode = mode;
  self->input->video_enabled = TRUE;
  if (self->input->start_streams)
    self->input->start_streams (self->input->videosrc);
  g_mutex_unlock (&self->input->lock);

  return TRUE;
}

static gboolean
gst_net_client_clock_start (GstNetClientClock * self)
{
  GSocketAddress *servaddr;
  GSocketAddress *myaddr;
  GInetAddress *inetaddr;
  GSocket *socket;
  GError *error = NULL;

  g_return_val_if_fail (self->priv->address != NULL, FALSE);
  g_return_val_if_fail (self->priv->servaddr == NULL, FALSE);

  socket = g_socket_new (G_SOCKET_FAMILY_IPV4, G_SOCKET_TYPE_DATAGRAM,
      G_SOCKET_PROTOCOL_UDP, &error);

  if (socket == NULL)
    goto no_socket;

  /* check address we're bound to, mostly for debugging purposes */
  myaddr = g_socket_get_local_address (socket, &error);

  if (myaddr == NULL)
    goto getsockname_error;

  GST_DEBUG_OBJECT (self, "socket opened on UDP port %hd",
      g_inet_socket_address_get_port (G_INET_SOCKET_ADDRESS (myaddr)));

  g_object_unref (myaddr);

  /* create target address */
  inetaddr = g_inet_address_new_from_string (self->priv->address);

  if (inetaddr == NULL)
    goto bad_address;

  servaddr = g_inet_socket_address_new (inetaddr, self->priv->port);
  g_object_unref (inetaddr);

  g_assert (servaddr != NULL);

  GST_DEBUG_OBJECT (self, "will communicate with %s:%d", self->priv->address,
      self->priv->port);

  self->priv->cancel = g_cancellable_new ();
  self->priv->socket = socket;
  self->priv->servaddr = G_SOCKET_ADDRESS (servaddr);

  self->priv->thread = g_thread_try_new ("GstNetClientClock",
      gst_net_client_clock_thread, self, &error);

  if (error != NULL)
    goto no_thread;

  return TRUE;

  /* ERRORS */
no_socket:
  {
    GST_ERROR_OBJECT (self, "socket_new() failed: %s", error->message);
    g_error_free (error);
    return FALSE;
  }
getsockname_error:
  {
    GST_ERROR_OBJECT (self, "get_local_address() failed: %s", error->message);
    g_error_free (error);
    g_object_unref (socket);
    return FALSE;
  }
bad_address:
  {
    GST_ERROR_OBJECT (self, "inet_address_new_from_string('%s') failed",
        self->priv->address);
    g_object_unref (socket);
    return FALSE;
  }
no_thread:
  {
    GST_ERROR_OBJECT (self, "could not create thread: %s", error->message);
    g_object_unref (self->priv->servaddr);
    self->priv->servaddr = NULL;
    g_object_unref (self->priv->socket);
    self->priv->socket = NULL;
    g_error_free (error);
    return FALSE;
  }
}

static gboolean
gst_vp8_enc_finish (GstBaseVideoEncoder * base_video_encoder)
{
  GstVP8Enc *encoder;
  GstVideoFrame *frame;
  int flags = 0;
  vpx_codec_err_t status;
  vpx_codec_iter_t iter = NULL;
  const vpx_codec_cx_pkt_t *pkt;

  GST_DEBUG_OBJECT (base_video_encoder, "finish");

  encoder = GST_VP8_ENC (base_video_encoder);

  status =
      vpx_codec_encode (&encoder->encoder, NULL, encoder->n_frames, 1, flags,
      0);
  if (status != 0) {
    GST_ERROR_OBJECT (encoder, "encode returned %d %s", status,
        gst_vpx_error_name (status));
    return FALSE;
  }

  pkt = vpx_codec_get_cx_data (&encoder->encoder, &iter);
  while (pkt != NULL) {
    GstBuffer *buffer;
    GstVP8EncCoderHook *hook;
    gboolean invisible, keyframe;

    GST_DEBUG_OBJECT (encoder, "packet %u type %d", (guint) pkt->data.frame.sz,
        pkt->kind);

    if (pkt->kind == VPX_CODEC_STATS_PKT
        && encoder->multipass_mode == VPX_RC_FIRST_PASS) {
      GST_LOG_OBJECT (encoder, "handling STATS packet");

      g_byte_array_append (encoder->first_pass_cache_content,
          pkt->data.twopass_stats.buf, pkt->data.twopass_stats.sz);

      frame = gst_base_video_encoder_get_oldest_frame (base_video_encoder);
      if (frame != NULL) {
        buffer = gst_buffer_new ();
        GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_PREROLL);
        frame->src_buffer = buffer;
        gst_base_video_encoder_finish_frame (base_video_encoder, frame);
      }

      pkt = vpx_codec_get_cx_data (&encoder->encoder, &iter);
      continue;
    } else if (pkt->kind != VPX_CODEC_CX_FRAME_PKT) {
      GST_LOG_OBJECT (encoder, "non frame pkt: %d", pkt->kind);
      pkt = vpx_codec_get_cx_data (&encoder->encoder, &iter);
      continue;
    }

    invisible = (pkt->data.frame.flags & VPX_FRAME_IS_INVISIBLE) != 0;
    keyframe = (pkt->data.frame.flags & VPX_FRAME_IS_KEY) != 0;
    frame = gst_base_video_encoder_get_oldest_frame (base_video_encoder);
    g_assert (frame != NULL);
    hook = frame->coder_hook;

    buffer = gst_buffer_new_and_alloc (pkt->data.frame.sz);

    memcpy (GST_BUFFER_DATA (buffer), pkt->data.frame.buf, pkt->data.frame.sz);
    frame->is_sync_point = frame->is_sync_point || keyframe;

    if (hook->image)
      g_slice_free (vpx_image_t, hook->image);
    hook->image = NULL;

    if (invisible) {
      hook->invisible = g_list_append (hook->invisible, buffer);
    } else {
      frame->src_buffer = buffer;
      gst_base_video_encoder_finish_frame (base_video_encoder, frame);
      frame = NULL;
    }

    pkt = vpx_codec_get_cx_data (&encoder->encoder, &iter);
  }

  if (encoder->multipass_mode == VPX_RC_FIRST_PASS
      && encoder->multipass_cache_file) {
    GError *err = NULL;

    if (!g_file_set_contents (encoder->multipass_cache_file,
            (const gchar *) encoder->first_pass_cache_content->data,
            encoder->first_pass_cache_content->len, &err)) {
      GST_ELEMENT_ERROR (encoder, RESOURCE, WRITE, (NULL),
          ("Failed to write multipass cache file: %s", err->message));
      g_error_free (err);
    }
  }

  return TRUE;
}

static GstFlowReturn
gst_rsvg_decode_image (GstRsvgDec * rsvg, GstBuffer * buffer,
    GstVideoCodecFrame * frame)
{
  GstVideoDecoder *decoder = GST_VIDEO_DECODER (rsvg);
  GstFlowReturn ret = GST_FLOW_OK;
  cairo_t *cr;
  cairo_surface_t *surface;
  RsvgHandle *handle;
  GError *error = NULL;
  RsvgDimensionData dimension;
  gdouble scalex, scaley;
  GstMapInfo minfo;
  GstVideoFrame vframe;
  GstVideoCodecState *output_state;

  GST_LOG_OBJECT (rsvg, "parsing svg");

  if (!gst_buffer_map (buffer, &minfo, GST_MAP_READ)) {
    GST_ERROR_OBJECT (rsvg, "Failed to get SVG image");
    return GST_FLOW_ERROR;
  }
  handle = rsvg_handle_new_from_data (minfo.data, minfo.size, &error);
  if (!handle) {
    GST_ERROR_OBJECT (rsvg, "Failed to parse SVG image: %s", error->message);
    g_error_free (error);
    return GST_FLOW_ERROR;
  }

  rsvg_handle_get_dimensions (handle, &dimension);

  output_state = gst_video_decoder_get_output_state (decoder);
  if ((output_state == NULL)
      || GST_VIDEO_INFO_WIDTH (&output_state->info) != dimension.width
      || GST_VIDEO_INFO_HEIGHT (&output_state->info) != dimension.height) {

    /* Create the output state */
    gst_video_decoder_set_output_state (decoder, GST_RSVG_VIDEO_FORMAT,
        dimension.width, dimension.height, rsvg->input_state);
    if (output_state)
      gst_video_codec_state_unref (output_state);
    output_state = gst_video_decoder_get_output_state (decoder);
  }

  ret = gst_video_decoder_allocate_output_frame (decoder, frame);

  if (ret != GST_FLOW_OK) {
    g_object_unref (handle);
    GST_ERROR_OBJECT (rsvg, "Buffer allocation failed %s",
        gst_flow_get_name (ret));
    return ret;
  }

  GST_LOG_OBJECT (rsvg, "render image at %d x %d",
      GST_VIDEO_INFO_HEIGHT (&output_state->info),
      GST_VIDEO_INFO_WIDTH (&output_state->info));


  if (!gst_video_frame_map (&vframe,
          &gst_video_decoder_get_output_state (decoder)->info,
          frame->output_buffer, GST_MAP_READWRITE)) {
    GST_ERROR_OBJECT (rsvg, "Failed to get SVG image");
    return GST_FLOW_ERROR;
  }
  surface =
      cairo_image_surface_create_for_data (GST_VIDEO_FRAME_PLANE_DATA (&vframe,
          0), CAIRO_FORMAT_ARGB32, GST_VIDEO_FRAME_WIDTH (&vframe),
      GST_VIDEO_FRAME_HEIGHT (&vframe), GST_VIDEO_FRAME_PLANE_STRIDE (&vframe,
          0));

  cr = cairo_create (surface);
  cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
  cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0);
  cairo_paint (cr);
  cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
  cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 1.0);

  scalex = scaley = 1.0;
  if (GST_VIDEO_INFO_WIDTH (&output_state->info) != dimension.width) {
    scalex =
        ((gdouble) GST_VIDEO_INFO_WIDTH (&output_state->info)) /
        ((gdouble) dimension.width);
  }
  if (GST_VIDEO_INFO_HEIGHT (&output_state->info) != dimension.height) {
    scaley =
        ((gdouble) GST_VIDEO_INFO_HEIGHT (&output_state->info)) /
        ((gdouble) dimension.height);
  }
  cairo_scale (cr, scalex, scaley);
  rsvg_handle_render_cairo (handle, cr);

  g_object_unref (handle);
  cairo_destroy (cr);
  cairo_surface_destroy (surface);

  /* Now unpremultiply Cairo's ARGB to match GStreamer's */
  gst_rsvg_decode_unpremultiply (GST_VIDEO_FRAME_PLANE_DATA (&vframe, 0),
      GST_VIDEO_FRAME_WIDTH (&vframe), GST_VIDEO_FRAME_HEIGHT (&vframe));

  gst_video_codec_state_unref (output_state);
//.........这里部分代码省略.........

gboolean
gst_egl_adaptation_init_egl_display (GstEglAdaptationContext * ctx)
{
  GstMessage *msg;
  EGLDisplay display;
  GST_DEBUG_OBJECT (ctx->element, "Enter EGL initial configuration");

  if (!platform_wrapper_init ()) {
    GST_ERROR_OBJECT (ctx->element, "Couldn't init EGL platform wrapper");
    goto HANDLE_ERROR;
  }

  msg =
      gst_message_new_need_context (GST_OBJECT_CAST (ctx->element),
      GST_EGL_DISPLAY_CONTEXT_TYPE);
  gst_element_post_message (GST_ELEMENT_CAST (ctx->element), msg);

  GST_OBJECT_LOCK (ctx->element);
  if (!ctx->set_display) {
    GstContext *context;

    GST_OBJECT_UNLOCK (ctx->element);

    display = eglGetDisplay (EGL_DEFAULT_DISPLAY);
    if (display == EGL_NO_DISPLAY) {
      GST_ERROR_OBJECT (ctx->element, "Could not get EGL display connection");
      goto HANDLE_ERROR;        /* No EGL error is set by eglGetDisplay() */
    }
    ctx->display = gst_egl_display_new (display, (GDestroyNotify) eglTerminate);

    context = gst_context_new_egl_display (ctx->display, FALSE);
    msg = gst_message_new_have_context (GST_OBJECT (ctx->element), context);
    gst_element_post_message (GST_ELEMENT_CAST (ctx->element), msg);
  }

  if (!eglInitialize (gst_egl_display_get (ctx->display),
          &ctx->eglglesctx->egl_major, &ctx->eglglesctx->egl_minor)) {
    got_egl_error ("eglInitialize");
    GST_ERROR_OBJECT (ctx->element, "Could not init EGL display connection");
    goto HANDLE_EGL_ERROR;
  }

  /* Check against required EGL version
   * XXX: Need to review the version requirement in terms of the needed API
   */
  if (ctx->eglglesctx->egl_major < GST_EGLGLESSINK_EGL_MIN_VERSION) {
    GST_ERROR_OBJECT (ctx->element, "EGL v%d needed, but you only have v%d.%d",
        GST_EGLGLESSINK_EGL_MIN_VERSION, ctx->eglglesctx->egl_major,
        ctx->eglglesctx->egl_minor);
    goto HANDLE_ERROR;
  }

  GST_INFO_OBJECT (ctx->element, "System reports supported EGL version v%d.%d",
      ctx->eglglesctx->egl_major, ctx->eglglesctx->egl_minor);

  eglBindAPI (EGL_OPENGL_ES_API);

  return TRUE;

  /* Errors */
HANDLE_EGL_ERROR:
  GST_ERROR_OBJECT (ctx->element, "EGL call returned error %x", eglGetError ());
HANDLE_ERROR:
  GST_ERROR_OBJECT (ctx->element, "Couldn't setup window/surface from handle");
  return FALSE;
}

//.........这里部分代码省略.........
	if (sbc->block_length & BT_A2DP_BLOCK_LENGTH_8) {
		g_value_set_int(value, 8);
		gst_value_list_prepend_value(list, value);
	}
	if (sbc->block_length & BT_A2DP_BLOCK_LENGTH_4) {
		g_value_set_int(value, 4);
		gst_value_list_prepend_value(list, value);
	}
	g_value_unset(value);
	if (list) {
		gst_structure_set_value(structure, "blocks", list);
		g_free(list);
		list = NULL;
	}

	/* allocation */
	g_value_init(value, G_TYPE_STRING);
	list = g_value_init(g_new0(GValue,1), GST_TYPE_LIST);
	if (sbc->allocation_method & BT_A2DP_ALLOCATION_LOUDNESS) {
		g_value_set_static_string(value, "loudness");
		gst_value_list_prepend_value(list, value);
	}
	if (sbc->allocation_method & BT_A2DP_ALLOCATION_SNR) {
		g_value_set_static_string(value, "snr");
		gst_value_list_prepend_value(list, value);
	}
	g_value_unset(value);
	if (list) {
		gst_structure_set_value(structure, "allocation", list);
		g_free(list);
		list = NULL;
	}

	/* rate */
	g_value_init(value, G_TYPE_INT);
	list = g_value_init(g_new0(GValue, 1), GST_TYPE_LIST);
	if (sbc->frequency & BT_SBC_SAMPLING_FREQ_48000) {
		g_value_set_int(value, 48000);
		gst_value_list_prepend_value(list, value);
	}
	if (sbc->frequency & BT_SBC_SAMPLING_FREQ_44100) {
		g_value_set_int(value, 44100);
		gst_value_list_prepend_value(list, value);
	}
	if (sbc->frequency & BT_SBC_SAMPLING_FREQ_32000) {
		g_value_set_int(value, 32000);
		gst_value_list_prepend_value(list, value);
	}
	if (sbc->frequency & BT_SBC_SAMPLING_FREQ_16000) {
		g_value_set_int(value, 16000);
		gst_value_list_prepend_value(list, value);
	}
	g_value_unset(value);
	if (list) {
		gst_structure_set_value(structure, "rate", list);
		g_free(list);
		list = NULL;
	}

	/* bitpool */
	value = g_value_init(value, GST_TYPE_INT_RANGE);
	gst_value_set_int_range(value,
			MIN(sbc->min_bitpool, TEMPLATE_MAX_BITPOOL),
			MIN(sbc->max_bitpool, TEMPLATE_MAX_BITPOOL));
	gst_structure_set_value(structure, "bitpool", value);
	g_value_unset(value);

	/* channels */
	mono = FALSE;
	stereo = FALSE;
	if (sbc->channel_mode & BT_A2DP_CHANNEL_MODE_MONO)
		mono = TRUE;
	if ((sbc->channel_mode & BT_A2DP_CHANNEL_MODE_STEREO) ||
			(sbc->channel_mode &
			BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL) ||
			(sbc->channel_mode &
			BT_A2DP_CHANNEL_MODE_JOINT_STEREO))
		stereo = TRUE;

	if (mono && stereo) {
		g_value_init(value, GST_TYPE_INT_RANGE);
		gst_value_set_int_range(value, 1, 2);
	} else {
		g_value_init(value, G_TYPE_INT);
		if (mono)
			g_value_set_int(value, 1);
		else if (stereo)
			g_value_set_int(value, 2);
		else {
			GST_ERROR_OBJECT(self,
				"Unexpected number of channels");
			g_value_set_int(value, 0);
		}
	}

	gst_structure_set_value(structure, "channels", value);
	g_free(value);

	return structure;
}

//.........这里部分代码省略.........
	gst_structure_set_value(structure, "mpegversion", list);
	g_free(list);

	/* layer */
	GST_LOG_OBJECT(self, "setting mpeg layer");
	list = g_value_init(g_new0(GValue, 1), GST_TYPE_LIST);
	if (mpeg->layer & BT_MPEG_LAYER_1) {
		g_value_set_int(value, 1);
		gst_value_list_prepend_value(list, value);
		valid_layer = TRUE;
	}
	if (mpeg->layer & BT_MPEG_LAYER_2) {
		g_value_set_int(value, 2);
		gst_value_list_prepend_value(list, value);
		valid_layer = TRUE;
	}
	if (mpeg->layer & BT_MPEG_LAYER_3) {
		g_value_set_int(value, 3);
		gst_value_list_prepend_value(list, value);
		valid_layer = TRUE;
	}
	if (list) {
		gst_structure_set_value(structure, "layer", list);
		g_free(list);
		list = NULL;
	}

	if (!valid_layer) {
		gst_structure_free(structure);
		g_free(value);
		return NULL;
	}

	/* rate */
	GST_LOG_OBJECT(self, "setting mpeg rate");
	list = g_value_init(g_new0(GValue, 1), GST_TYPE_LIST);
	if (mpeg->frequency & BT_MPEG_SAMPLING_FREQ_48000) {
		g_value_set_int(value, 48000);
		gst_value_list_prepend_value(list, value);
	}
	if (mpeg->frequency & BT_MPEG_SAMPLING_FREQ_44100) {
		g_value_set_int(value, 44100);
		gst_value_list_prepend_value(list, value);
	}
	if (mpeg->frequency & BT_MPEG_SAMPLING_FREQ_32000) {
		g_value_set_int(value, 32000);
		gst_value_list_prepend_value(list, value);
	}
	if (mpeg->frequency & BT_MPEG_SAMPLING_FREQ_24000) {
		g_value_set_int(value, 24000);
		gst_value_list_prepend_value(list, value);
	}
	if (mpeg->frequency & BT_MPEG_SAMPLING_FREQ_22050) {
		g_value_set_int(value, 22050);
		gst_value_list_prepend_value(list, value);
	}
	if (mpeg->frequency & BT_MPEG_SAMPLING_FREQ_16000) {
		g_value_set_int(value, 16000);
		gst_value_list_prepend_value(list, value);
	}
	g_value_unset(value);
	if (list) {
		gst_structure_set_value(structure, "rate", list);
		g_free(list);
		list = NULL;
	}

	/* channels */
	GST_LOG_OBJECT(self, "setting mpeg channels");
	mono = FALSE;
	stereo = FALSE;
	if (mpeg->channel_mode & BT_A2DP_CHANNEL_MODE_MONO)
		mono = TRUE;
	if ((mpeg->channel_mode & BT_A2DP_CHANNEL_MODE_STEREO) ||
			(mpeg->channel_mode &
			BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL) ||
			(mpeg->channel_mode &
			BT_A2DP_CHANNEL_MODE_JOINT_STEREO))
		stereo = TRUE;

	if (mono && stereo) {
		g_value_init(value, GST_TYPE_INT_RANGE);
		gst_value_set_int_range(value, 1, 2);
	} else {
		g_value_init(value, G_TYPE_INT);
		if (mono)
			g_value_set_int(value, 1);
		else if (stereo)
			g_value_set_int(value, 2);
		else {
			GST_ERROR_OBJECT(self,
				"Unexpected number of channels");
			g_value_set_int(value, 0);
		}
	}
	gst_structure_set_value(structure, "channels", value);
	g_free(value);

	return structure;
}

static gboolean gst_avdtp_sink_init_sbc_pkt_conf(GstAvdtpSink *sink,
					GstCaps *caps,
					sbc_capabilities_t *pkt)
{
	sbc_capabilities_t *cfg;
	const GValue *value = NULL;
	const char *pref, *name;
	gint rate, subbands, blocks;
	GstStructure *structure = gst_caps_get_structure(caps, 0);

	cfg = (void *) gst_avdtp_find_caps(sink, BT_A2DP_SBC_SINK);
	name = gst_structure_get_name(structure);

	if (!(IS_SBC(name))) {
		GST_ERROR_OBJECT(sink, "Unexpected format %s, "
				"was expecting sbc", name);
		return FALSE;
	}

	value = gst_structure_get_value(structure, "rate");
	rate = g_value_get_int(value);
	if (rate == 44100)
		cfg->frequency = BT_SBC_SAMPLING_FREQ_44100;
	else if (rate == 48000)
		cfg->frequency = BT_SBC_SAMPLING_FREQ_48000;
	else if (rate == 32000)
		cfg->frequency = BT_SBC_SAMPLING_FREQ_32000;
	else if (rate == 16000)
		cfg->frequency = BT_SBC_SAMPLING_FREQ_16000;
	else {
		GST_ERROR_OBJECT(sink, "Invalid rate while setting caps");
		return FALSE;
	}

	value = gst_structure_get_value(structure, "mode");
	pref = g_value_get_string(value);
	if (strcmp(pref, "mono") == 0)
		cfg->channel_mode = BT_A2DP_CHANNEL_MODE_MONO;
	else if (strcmp(pref, "dual") == 0)
		cfg->channel_mode = BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL;
	else if (strcmp(pref, "stereo") == 0)
		cfg->channel_mode = BT_A2DP_CHANNEL_MODE_STEREO;
	else if (strcmp(pref, "joint") == 0)
		cfg->channel_mode = BT_A2DP_CHANNEL_MODE_JOINT_STEREO;
	else {
		GST_ERROR_OBJECT(sink, "Invalid mode %s", pref);
		return FALSE;
	}

	value = gst_structure_get_value(structure, "allocation");
	pref = g_value_get_string(value);
	if (strcmp(pref, "loudness") == 0)
		cfg->allocation_method = BT_A2DP_ALLOCATION_LOUDNESS;
	else if (strcmp(pref, "snr") == 0)
		cfg->allocation_method = BT_A2DP_ALLOCATION_SNR;
	else {
		GST_ERROR_OBJECT(sink, "Invalid allocation: %s", pref);
		return FALSE;
	}

	value = gst_structure_get_value(structure, "subbands");
	subbands = g_value_get_int(value);
	if (subbands == 8)
		cfg->subbands = BT_A2DP_SUBBANDS_8;
	else if (subbands == 4)
		cfg->subbands = BT_A2DP_SUBBANDS_4;
	else {
		GST_ERROR_OBJECT(sink, "Invalid subbands %d", subbands);
		return FALSE;
	}

	value = gst_structure_get_value(structure, "blocks");
	blocks = g_value_get_int(value);
	if (blocks == 16)
		cfg->block_length = BT_A2DP_BLOCK_LENGTH_16;
	else if (blocks == 12)
		cfg->block_length = BT_A2DP_BLOCK_LENGTH_12;
	else if (blocks == 8)
		cfg->block_length = BT_A2DP_BLOCK_LENGTH_8;
	else if (blocks == 4)
		cfg->block_length = BT_A2DP_BLOCK_LENGTH_4;
	else {
		GST_ERROR_OBJECT(sink, "Invalid blocks %d", blocks);
		return FALSE;
	}

	value = gst_structure_get_value(structure, "bitpool");
	cfg->max_bitpool = cfg->min_bitpool = g_value_get_int(value);

	memcpy(pkt, cfg, sizeof(*pkt));

	return TRUE;
}

static gboolean gst_avdtp_sink_conf_recv_stream_fd(
					GstAvdtpSink *self)
{
	struct bluetooth_data *data = self->data;
	gint ret;
	GIOError err;
	GError *gerr = NULL;
	GIOStatus status;
	GIOFlags flags;
	gsize read;

	ret = gst_avdtp_sink_bluetooth_recvmsg_fd(self);
	if (ret < 0)
		return FALSE;

	if (!self->stream) {
		GST_ERROR_OBJECT(self, "Error while configuring device: "
				"could not acquire audio socket");
		return FALSE;
	}

	/* set stream socket to nonblock */
	GST_LOG_OBJECT(self, "setting stream socket to nonblock");
	flags = g_io_channel_get_flags(self->stream);
	flags |= G_IO_FLAG_NONBLOCK;
	status = g_io_channel_set_flags(self->stream, flags, &gerr);
	if (status != G_IO_STATUS_NORMAL) {
		if (gerr)
			GST_WARNING_OBJECT(self, "Error while "
				"setting server socket to nonblock: "
				"%s", gerr->message);
		else
			GST_WARNING_OBJECT(self, "Error while "
					"setting server "
					"socket to nonblock");
	}

	/* It is possible there is some outstanding
	data in the pipe - we have to empty it */
	GST_LOG_OBJECT(self, "emptying stream pipe");
	while (1) {
		err = g_io_channel_read(self->stream, data->buffer,
					(gsize) data->link_mtu,
					&read);
		if (err != G_IO_ERROR_NONE || read <= 0)
			break;
	}

	/* set stream socket to block */
	GST_LOG_OBJECT(self, "setting stream socket to block");
	flags = g_io_channel_get_flags(self->stream);
	flags &= ~G_IO_FLAG_NONBLOCK;
	status = g_io_channel_set_flags(self->stream, flags, &gerr);
	if (status != G_IO_STATUS_NORMAL) {
		if (gerr)
			GST_WARNING_OBJECT(self, "Error while "
				"setting server socket to block:"
				"%s", gerr->message);
		else
			GST_WARNING_OBJECT(self, "Error while "
				"setting server "
				"socket to block");
	}

	memset(data->buffer, 0, sizeof(data->buffer));

	return TRUE;
}

static gboolean gst_avdtp_sink_configure(GstAvdtpSink *self,
			GstCaps *caps)
{
	gchar buf[BT_SUGGESTED_BUFFER_SIZE];
	struct bt_open_req *open_req = (void *) buf;
	struct bt_open_rsp *open_rsp = (void *) buf;
	struct bt_set_configuration_req *req = (void *) buf;
	struct bt_set_configuration_rsp *rsp = (void *) buf;
	gboolean ret;
	GIOError io_error;
	gchar *temp;
	GstStructure *structure;
	codec_capabilities_t *codec = NULL;

	temp = gst_caps_to_string(caps);
	GST_DEBUG_OBJECT(self, "configuring device with caps: %s", temp);
	g_free(temp);

	structure = gst_caps_get_structure(caps, 0);

	if (gst_structure_has_name(structure, "audio/x-sbc"))
		codec = (void *) gst_avdtp_find_caps(self, BT_A2DP_SBC_SINK);
	else if (gst_structure_has_name(structure, "audio/mpeg"))
		codec = (void *) gst_avdtp_find_caps(self, BT_A2DP_MPEG12_SINK);

	if (codec == NULL) {
		GST_ERROR_OBJECT(self, "Couldn't parse caps "
				"to packet configuration");
		return FALSE;
	}

	memset(req, 0, BT_SUGGESTED_BUFFER_SIZE);
	open_req->h.type = BT_REQUEST;
	open_req->h.name = BT_OPEN;
	open_req->h.length = sizeof(*open_req);

	strncpy(open_req->destination, self->device, 18);
	open_req->seid = codec->seid;
	open_req->lock = BT_WRITE_LOCK;

	io_error = gst_avdtp_sink_audioservice_send(self, &open_req->h);
	if (io_error != G_IO_ERROR_NONE) {
		GST_ERROR_OBJECT(self, "Error ocurred while sending "
					"open packet");
		return FALSE;
	}

	open_rsp->h.length = sizeof(*open_rsp);
	io_error = gst_avdtp_sink_audioservice_expect(self,
			&open_rsp->h, BT_OPEN);
	if (io_error != G_IO_ERROR_NONE) {
		GST_ERROR_OBJECT(self, "Error while receiving device "
					"confirmation");
		return FALSE;
	}

	memset(req, 0, sizeof(buf));
	req->h.type = BT_REQUEST;
	req->h.name = BT_SET_CONFIGURATION;
	req->h.length = sizeof(*req);

	if (codec->type == BT_A2DP_SBC_SINK)
		ret = gst_avdtp_sink_init_sbc_pkt_conf(self, caps,
				(void *) &req->codec);
	else
		ret = gst_avdtp_sink_init_mp3_pkt_conf(self, caps,
				(void *) &req->codec);

	if (!ret) {
		GST_ERROR_OBJECT(self, "Couldn't parse caps "
				"to packet configuration");
		return FALSE;
	}

	req->h.length += req->codec.length - sizeof(req->codec);
	io_error = gst_avdtp_sink_audioservice_send(self, &req->h);
	if (io_error != G_IO_ERROR_NONE) {
		GST_ERROR_OBJECT(self, "Error ocurred while sending "
					"configurarion packet");
		return FALSE;
	}

	rsp->h.length = sizeof(*rsp);
	io_error = gst_avdtp_sink_audioservice_expect(self,
			&rsp->h, BT_SET_CONFIGURATION);
	if (io_error != G_IO_ERROR_NONE) {
		GST_ERROR_OBJECT(self, "Error while receiving device "
					"confirmation");
		return FALSE;
	}

	self->data->link_mtu = rsp->link_mtu;

	return TRUE;
}

//.........这里部分代码省略.........
    gst_video_codec_state_unref (output_state);

    if (!gst_video_decoder_negotiate (decoder)) {
      if (GST_PAD_IS_FLUSHING (decoder->srcpad))
        goto flushing;
      else
        goto not_negotiated;
    }

    /* Ensure our internal pool is activated */
    if (!gst_buffer_pool_set_active (GST_BUFFER_POOL (self->v4l2capture->pool),
            TRUE))
      goto activate_failed;
  }

  if (g_atomic_int_get (&self->processing) == FALSE) {
    /* It's possible that the processing thread stopped due to an error */
    if (self->output_flow != GST_FLOW_OK &&
        self->output_flow != GST_FLOW_FLUSHING) {
      GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
      ret = self->output_flow;
      goto drop;
    }

    GST_DEBUG_OBJECT (self, "Starting decoding thread");

    /* Start the processing task, when it quits, the task will disable input
     * processing to unlock input if draining, or prevent potential block */
    g_atomic_int_set (&self->processing, TRUE);
    if (!gst_pad_start_task (decoder->srcpad,
            (GstTaskFunction) gst_v4l2_video_dec_loop, self,
            (GDestroyNotify) gst_v4l2_video_dec_loop_stopped))
      goto start_task_failed;
  }

  if (frame->input_buffer) {
    GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
    ret =
        gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
            pool), &frame->input_buffer);
    GST_VIDEO_DECODER_STREAM_LOCK (decoder);

    if (ret == GST_FLOW_FLUSHING) {
      if (g_atomic_int_get (&self->processing) == FALSE)
        ret = self->output_flow;
      goto drop;
    } else if (ret != GST_FLOW_OK) {
      goto process_failed;
    }

    /* No need to keep input arround */
    gst_buffer_replace (&frame->input_buffer, NULL);
  }

  gst_video_codec_frame_unref (frame);
  return ret;

  /* ERRORS */
not_negotiated:
  {
    GST_ERROR_OBJECT (self, "not negotiated");
    ret = GST_FLOW_NOT_NEGOTIATED;
    goto drop;
  }
activate_failed:
  {
    GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
        (_("Failed to allocate required memory.")),
        ("Buffer pool activation failed"));
    ret = GST_FLOW_ERROR;
    goto drop;
  }
flushing:
  {
    ret = GST_FLOW_FLUSHING;
    goto drop;
  }

start_task_failed:
  {
    GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
        (_("Failed to start decoding thread.")), (NULL));
    g_atomic_int_set (&self->processing, FALSE);
    ret = GST_FLOW_ERROR;
    goto drop;
  }
process_failed:
  {
    GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
        (_("Failed to process frame.")),
        ("Maybe be due to not enough memory or failing driver"));
    ret = GST_FLOW_ERROR;
    goto drop;
  }
drop:
  {
    gst_video_decoder_drop_frame (decoder, frame);
    return ret;
  }
}

static GstFlowReturn
pad_chain (GstPad *pad,
           GstBuffer *buf)
{
    GOmxCore *gomx;
    GOmxPort *in_port;
    GstOmxBaseFilter *self;
    GstFlowReturn ret = GST_FLOW_OK;

    self = GST_OMX_BASE_FILTER (GST_OBJECT_PARENT (pad));

    gomx = self->gomx;

    GST_LOG_OBJECT (self, "begin");
    GST_LOG_OBJECT (self, "gst_buffer: size=%u", GST_BUFFER_SIZE (buf));

    GST_LOG_OBJECT (self, "state: %d", gomx->omx_state);

    if (G_UNLIKELY (gomx->omx_state == OMX_StateLoaded))
    {
        g_mutex_lock (self->ready_lock);

        GST_INFO_OBJECT (self, "omx: prepare");

        /** @todo this should probably go after doing preparations. */
        if (self->omx_setup)
        {
            self->omx_setup (self);
        }

        setup_ports (self);

        g_omx_core_prepare (self->gomx);

        if (gomx->omx_state == OMX_StateIdle)
        {
            self->ready = TRUE;
            gst_pad_start_task (self->srcpad, output_loop, self->srcpad);
        }

        g_mutex_unlock (self->ready_lock);

        if (gomx->omx_state != OMX_StateIdle)
            goto out_flushing;
    }

    in_port = self->in_port;

    if (G_LIKELY (in_port->enabled))
    {
        guint buffer_offset = 0;

        if (G_UNLIKELY (gomx->omx_state == OMX_StateIdle))
        {
            GST_INFO_OBJECT (self, "omx: play");
            g_omx_core_start (gomx);

            if (gomx->omx_state != OMX_StateExecuting)
                goto out_flushing;

            /* send buffer with codec data flag */
            /** @todo move to util */
            if (self->codec_data)
            {
                OMX_BUFFERHEADERTYPE *omx_buffer;

                GST_LOG_OBJECT (self, "request buffer");
                omx_buffer = g_omx_port_request_buffer (in_port);

                if (G_LIKELY (omx_buffer))
                {
                    omx_buffer->nFlags |= 0x00000080; /* codec data flag */

                    omx_buffer->nFilledLen = GST_BUFFER_SIZE (self->codec_data);
                    memcpy (omx_buffer->pBuffer + omx_buffer->nOffset, GST_BUFFER_DATA (self->codec_data), omx_buffer->nFilledLen);

                    GST_LOG_OBJECT (self, "release_buffer");
                    g_omx_port_release_buffer (in_port, omx_buffer);
                }
            }
        }

        if (G_UNLIKELY (gomx->omx_state != OMX_StateExecuting))
        {
            GST_ERROR_OBJECT (self, "Whoa! very wrong");
        }

        while (G_LIKELY (buffer_offset < GST_BUFFER_SIZE (buf)))
        {
            OMX_BUFFERHEADERTYPE *omx_buffer;

            if (self->last_pad_push_return != GST_FLOW_OK ||
                !(gomx->omx_state == OMX_StateExecuting ||
                  gomx->omx_state == OMX_StatePause))
            {
                goto out_flushing;
            }

            GST_LOG_OBJECT (self, "request buffer");
            omx_buffer = g_omx_port_request_buffer (in_port);
//.........这里部分代码省略.........

static GstFlowReturn
gst_inter_audio_src_create (GstBaseSrc * src, guint64 offset, guint size,
    GstBuffer ** buf)
{
  GstInterAudioSrc *interaudiosrc = GST_INTER_AUDIO_SRC (src);
  GstCaps *caps;
  GstBuffer *buffer;
  guint n, bpf;
  guint64 period_time;
  guint64 period_samples;

  GST_DEBUG_OBJECT (interaudiosrc, "create");

  buffer = NULL;
  caps = NULL;

  g_mutex_lock (&interaudiosrc->surface->mutex);
  if (interaudiosrc->surface->audio_info.finfo) {
    if (!gst_audio_info_is_equal (&interaudiosrc->surface->audio_info,
            &interaudiosrc->info)) {
      caps = gst_audio_info_to_caps (&interaudiosrc->surface->audio_info);
      interaudiosrc->timestamp_offset +=
          gst_util_uint64_scale (interaudiosrc->n_samples, GST_SECOND,
          interaudiosrc->info.rate);
      interaudiosrc->n_samples = 0;
    }
  }

  bpf = interaudiosrc->surface->audio_info.bpf;
  period_time = interaudiosrc->surface->audio_period_time;
  period_samples =
      gst_util_uint64_scale (period_time, interaudiosrc->info.rate, GST_SECOND);

  if (bpf > 0)
    n = gst_adapter_available (interaudiosrc->surface->audio_adapter) / bpf;
  else
    n = 0;

  if (n > period_samples)
    n = period_samples;
  if (n > 0) {
    buffer = gst_adapter_take_buffer (interaudiosrc->surface->audio_adapter,
        n * bpf);
  } else {
    buffer = gst_buffer_new ();
    GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_GAP);
  }
  g_mutex_unlock (&interaudiosrc->surface->mutex);

  if (caps) {
    gboolean ret = gst_base_src_set_caps (src, caps);
    gst_caps_unref (caps);
    if (!ret) {
      GST_ERROR_OBJECT (src, "Failed to set caps %" GST_PTR_FORMAT, caps);
      if (buffer)
        gst_buffer_unref (buffer);
      return GST_FLOW_NOT_NEGOTIATED;
    }
  }

  buffer = gst_buffer_make_writable (buffer);

  bpf = interaudiosrc->info.bpf;
  if (n < period_samples) {
    GstMapInfo map;
    GstMemory *mem;

    GST_DEBUG_OBJECT (interaudiosrc,
        "creating %" G_GUINT64_FORMAT " samples of silence",
        period_samples - n);
    mem = gst_allocator_alloc (NULL, (period_samples - n) * bpf, NULL);
    if (gst_memory_map (mem, &map, GST_MAP_WRITE)) {
      gst_audio_format_fill_silence (interaudiosrc->info.finfo, map.data,
          map.size);
      gst_memory_unmap (mem, &map);
    }
    gst_buffer_prepend_memory (buffer, mem);
  }
  n = period_samples;

  GST_BUFFER_OFFSET (buffer) = interaudiosrc->n_samples;
  GST_BUFFER_OFFSET_END (buffer) = interaudiosrc->n_samples + n;
  GST_BUFFER_TIMESTAMP (buffer) = interaudiosrc->timestamp_offset +
      gst_util_uint64_scale (interaudiosrc->n_samples, GST_SECOND,
      interaudiosrc->info.rate);
  GST_DEBUG_OBJECT (interaudiosrc, "create ts %" GST_TIME_FORMAT,
      GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
  GST_BUFFER_DURATION (buffer) = interaudiosrc->timestamp_offset +
      gst_util_uint64_scale (interaudiosrc->n_samples + n, GST_SECOND,
      interaudiosrc->info.rate) - GST_BUFFER_TIMESTAMP (buffer);
  GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DISCONT);
  if (interaudiosrc->n_samples == 0) {
    GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
  }
  interaudiosrc->n_samples += n;

  *buf = buffer;

  return GST_FLOW_OK;
}