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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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Implements a message handling function to preview pipeline bus. If GST_MESSAGE_ERROR is seen, considers preview pipeline unable to do its job and posts an error message to application. Sets pipeline element to NULL so that subsequent calls to post_preview and set_caps functions just returns without pushing anything to the disposed preview pipeline. Leaves further actions to the application.
329 lines
9.6 KiB
C
329 lines
9.6 KiB
C
/*
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* GStreamer
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* Copyright (C) 2008 Nokia Corporation <multimedia@maemo.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:camerabingeneral
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* @short_description: helper functions for #GstCameraBin and it's modules
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*
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* Common helper functions for #GstCameraBin, #GstCameraBinImage and
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* #GstCameraBinVideo.
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*
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*/
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#include <gst/app/gstappsrc.h>
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#include <gst/app/gstappsink.h>
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#include "gstcamerabinpreview.h"
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#include "gstbasecamerasrc.h"
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static void _gst_camerabin_preview_set_caps (GstCameraBinPreviewPipelineData *
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preview, GstCaps * caps);
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static gboolean
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bus_callback (GstBus * bus, GstMessage * message, gpointer user_data)
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{
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switch (GST_MESSAGE_TYPE (message)) {
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case GST_MESSAGE_ERROR:{
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GError *err;
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GstCameraBinPreviewPipelineData *data;
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data = user_data;
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gst_message_parse_error (message, &err, NULL);
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GST_WARNING ("Error from preview pipeline: %s", err->message);
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g_error_free (err);
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/* TODO Not sure if we should post an Error or Warning here */
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GST_ELEMENT_ERROR (data, CORE, FAILED,
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("fatal error in preview pipeline, disposing the pipeline"), (NULL));
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/* Possible error situations:
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* 1) cond_wait pending. prevent deadlock by signalling the cond
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* 2) preview_pipeline_post called with new buffer to handle. returns
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* because data->pipeline is set to null
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* 3) new preview caps incoming. returns because data->pipeline is null
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*/
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if (data->pipeline) {
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gst_element_set_state (data->pipeline, GST_STATE_NULL);
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gst_object_unref (data->pipeline);
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data->pipeline = NULL;
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}
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g_cond_signal (data->processing_cond);
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break;
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}
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default:
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break;
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}
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return TRUE;
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}
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static GstFlowReturn
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gst_camerabin_preview_pipeline_new_preroll (GstAppSink * appsink,
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gpointer user_data)
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{
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GstBuffer *buffer;
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buffer = gst_app_sink_pull_preroll (appsink);
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gst_buffer_unref (buffer);
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return GST_FLOW_OK;
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}
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static GstFlowReturn
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gst_camerabin_preview_pipeline_new_buffer (GstAppSink * appsink,
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gpointer user_data)
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{
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GstBuffer *buffer;
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GstStructure *s;
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GstMessage *msg;
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GstCameraBinPreviewPipelineData *data;
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data = user_data;
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buffer = gst_app_sink_pull_buffer (appsink);
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s = gst_structure_new (GST_BASE_CAMERA_SRC_PREVIEW_MESSAGE_NAME,
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"buffer", GST_TYPE_BUFFER, buffer, NULL);
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gst_buffer_unref (buffer);
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msg = gst_message_new_element (GST_OBJECT (data->element), s);
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GST_DEBUG_OBJECT (data->element, "sending message with preview image");
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if (gst_element_post_message (data->element, msg) == FALSE) {
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GST_WARNING_OBJECT (data->element,
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"This element has no bus, therefore no message sent!");
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}
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g_mutex_lock (data->processing_lock);
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data->processing--;
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if (data->processing == 0)
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g_cond_signal (data->processing_cond);
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g_mutex_unlock (data->processing_lock);
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return GST_FLOW_OK;
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}
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/**
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* gst_camerabin_create_preview_pipeline:
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* @element: Owner of this pipeline
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* @filter: Custom filter to process preview data (an extra ref is taken)
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*
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* Creates a new previewing pipeline that can receive buffers
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* to be posted as camerabin preview messages for @element
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*
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* Returns: The newly created #GstCameraBinPreviewPipelineData
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*/
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GstCameraBinPreviewPipelineData *
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gst_camerabin_create_preview_pipeline (GstElement * element,
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GstElement * filter)
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{
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GstCameraBinPreviewPipelineData *data;
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GstElement *csp;
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GstElement *csp2;
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GstElement *vscale;
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gboolean added = FALSE;
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GstBus *bus;
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GstAppSinkCallbacks callbacks = { 0, };
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data = g_new (GstCameraBinPreviewPipelineData, 1);
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data->pipeline = gst_pipeline_new ("preview-pipeline");
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data->appsrc = gst_element_factory_make ("appsrc", "preview-appsrc");
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data->capsfilter = gst_element_factory_make ("capsfilter",
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"preview-capsfilter");
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data->appsink = gst_element_factory_make ("appsink", "preview-appsink");
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csp = gst_element_factory_make ("ffmpegcolorspace", "preview-csp0");
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csp2 = gst_element_factory_make ("ffmpegcolorspace", "preview-csp1");
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vscale = gst_element_factory_make ("videoscale", "preview-vscale");
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if (!data->appsrc || !data->capsfilter || !data->appsink || !csp ||
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!csp2 || !vscale) {
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goto error;
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}
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gst_bin_add_many (GST_BIN (data->pipeline), data->appsrc, data->capsfilter,
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data->appsink, csp, csp2, vscale, NULL);
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if (filter)
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gst_bin_add (GST_BIN (data->pipeline), gst_object_ref (filter));
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added = TRUE;
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if (filter) {
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if (!gst_element_link_many (data->appsrc, filter, csp, vscale, csp2,
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data->capsfilter, data->appsink, NULL))
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goto error;
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} else {
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if (!gst_element_link_many (data->appsrc, csp, vscale, csp2,
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data->capsfilter, data->appsink, NULL))
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goto error;
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}
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callbacks.new_preroll = gst_camerabin_preview_pipeline_new_preroll;
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callbacks.new_buffer = gst_camerabin_preview_pipeline_new_buffer;
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gst_app_sink_set_callbacks ((GstAppSink *) data->appsink, &callbacks, data,
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NULL);
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bus = gst_pipeline_get_bus (GST_PIPELINE (data->pipeline));
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gst_bus_add_watch (bus, bus_callback, data);
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gst_object_unref (bus);
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g_object_set (data->appsink, "sync", FALSE, NULL);
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data->element = element;
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data->filter = filter;
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data->processing_lock = g_mutex_new ();
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data->processing_cond = g_cond_new ();
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data->pending_preview_caps = NULL;
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data->processing = 0;
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return data;
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error:
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GST_WARNING ("Failed to create camerabin's preview pipeline");
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if (!added) {
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if (csp)
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gst_object_unref (csp);
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if (csp2)
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gst_object_unref (csp2);
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if (vscale)
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gst_object_unref (vscale);
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if (data->appsrc)
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gst_object_unref (data->appsrc);
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if (data->capsfilter)
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gst_object_unref (data->capsfilter);
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if (data->appsink)
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gst_object_unref (data->appsink);
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}
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gst_camerabin_destroy_preview_pipeline (data);
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return NULL;
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}
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/**
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* gst_camerabin_destroy_preview_pipeline:
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* @preview: the #GstCameraBinPreviewPipelineData
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*
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* Frees a #GstCameraBinPreviewPipelineData
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*/
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void
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gst_camerabin_destroy_preview_pipeline (GstCameraBinPreviewPipelineData *
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preview)
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{
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if (preview->processing_lock) {
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g_mutex_free (preview->processing_lock);
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preview->processing_lock = NULL;
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}
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if (preview->processing_cond) {
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g_cond_free (preview->processing_cond);
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preview->processing_cond = NULL;
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}
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if (preview->pipeline) {
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gst_element_set_state (preview->pipeline, GST_STATE_NULL);
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gst_object_unref (preview->pipeline);
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}
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g_free (preview);
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}
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/**
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* gst_camerabin_preview_pipeline_post:
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* @preview: the #GstCameraBinPreviewPipelineData
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* @buffer: the buffer to be posted as a preview
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*
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* Converts the @buffer to the desired format and posts the preview
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* message to the bus.
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*
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* Returns: %TRUE on success
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*/
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gboolean
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gst_camerabin_preview_pipeline_post (GstCameraBinPreviewPipelineData * preview,
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GstBuffer * buffer)
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{
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g_return_val_if_fail (preview != NULL, FALSE);
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g_return_val_if_fail (preview->pipeline != NULL, FALSE);
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g_return_val_if_fail (buffer, FALSE);
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g_mutex_lock (preview->processing_lock);
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g_return_val_if_fail (preview->pipeline != NULL, FALSE);
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if (preview->pending_preview_caps) {
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if (preview->processing > 0) {
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g_cond_wait (preview->processing_cond, preview->processing_lock);
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}
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_gst_camerabin_preview_set_caps (preview, preview->pending_preview_caps);
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gst_caps_replace (&preview->pending_preview_caps, NULL);
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}
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preview->processing++;
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gst_app_src_push_buffer ((GstAppSrc *) preview->appsrc,
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gst_buffer_ref (buffer));
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g_mutex_unlock (preview->processing_lock);
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return TRUE;
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}
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static void
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_gst_camerabin_preview_set_caps (GstCameraBinPreviewPipelineData * preview,
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GstCaps * caps)
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{
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GstState state, pending;
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GstStateChangeReturn ret;
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g_return_if_fail (preview != NULL);
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g_return_if_fail (preview->pipeline != NULL);
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ret = gst_element_get_state (preview->pipeline, &state, &pending, 0);
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if (ret == GST_STATE_CHANGE_FAILURE) {
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/* make it try again */
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state = GST_STATE_PLAYING;
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pending = GST_STATE_VOID_PENDING;
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}
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gst_element_set_state (preview->pipeline, GST_STATE_NULL);
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g_object_set (preview->capsfilter, "caps", caps, NULL);
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if (pending != GST_STATE_VOID_PENDING)
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state = pending;
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gst_element_set_state (preview->pipeline, state);
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}
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/**
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* gst_camerabin_preview_set_caps:
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* @preview: the #GstCameraBinPreviewPipelineData
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* @caps: the #GstCaps to be set (a new ref will be taken)
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*
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* The caps that preview buffers should have when posted
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* on the bus
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*/
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void
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gst_camerabin_preview_set_caps (GstCameraBinPreviewPipelineData * preview,
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GstCaps * caps)
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{
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g_return_if_fail (preview != NULL);
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g_mutex_lock (preview->processing_lock);
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if (preview->processing == 0) {
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_gst_camerabin_preview_set_caps (preview, caps);
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} else {
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GST_DEBUG ("Preview pipeline busy, storing new caps as pending");
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gst_caps_replace (&preview->pending_preview_caps, caps);
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}
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g_mutex_unlock (preview->processing_lock);
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}
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