gstreamer/gst-libs/gst/basecamerabinsrc/gstcamerabinpreview.c
Tim-Philipp Müller 34c9c86ab7 basecamerabinsrc: don't use private GMutex implementation details
Don't use private GMutex implementation details to check
whether it has been freed already or not. Just clear mutex
and GCond unconditionally in free function, they are always
inited anyway, and the free function can't be called multiple
times either.
2015-02-17 09:56:55 +00:00

401 lines
12 KiB
C

/*
* GStreamer
* Copyright (C) 2008 Nokia Corporation <multimedia@maemo.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:camerabingeneral
* @short_description: helper functions for #GstCameraBin and it's modules
*
* Common helper functions for #GstCameraBin, #GstCameraBinImage and
* #GstCameraBinVideo.
*
*/
#include <gst/app/gstappsrc.h>
#include <gst/app/gstappsink.h>
#include <gst/glib-compat-private.h>
#include "gstcamerabinpreview.h"
#include "gstbasecamerasrc.h"
GST_DEBUG_CATEGORY_EXTERN (base_camera_src_debug);
#define GST_CAT_DEFAULT base_camera_src_debug
static void _gst_camerabin_preview_set_caps (GstCameraBinPreviewPipelineData *
preview, GstCaps * caps);
static gboolean
bus_callback (GstBus * bus, GstMessage * message, gpointer user_data)
{
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:{
GError *err;
GstCameraBinPreviewPipelineData *data;
data = user_data;
gst_message_parse_error (message, &err, NULL);
GST_WARNING ("Error from preview pipeline: %s", err->message);
g_error_free (err);
/* TODO Not sure if we should post an Error or Warning here */
GST_ELEMENT_ERROR (data, CORE, FAILED,
("fatal error in preview pipeline, disposing the pipeline"), (NULL));
/* Possible error situations:
* 1) cond_wait pending. prevent deadlock by signalling the cond
* 2) preview_pipeline_post called with new buffer to handle. returns
* because data->pipeline is set to null
* 3) new preview caps incoming. returns because data->pipeline is null
*/
if (data->pipeline) {
gst_element_set_state (data->pipeline, GST_STATE_NULL);
gst_object_unref (data->pipeline);
data->pipeline = NULL;
}
g_cond_signal (&data->processing_cond);
break;
}
default:
break;
}
return TRUE;
}
static GstFlowReturn
gst_camerabin_preview_pipeline_new_sample (GstAppSink * appsink,
gpointer user_data)
{
GstSample *sample;
GstStructure *s;
GstMessage *msg;
GstCameraBinPreviewPipelineData *data;
data = user_data;
sample = gst_app_sink_pull_sample (appsink);
s = gst_structure_new (GST_BASE_CAMERA_SRC_PREVIEW_MESSAGE_NAME,
"sample", GST_TYPE_SAMPLE, sample, NULL);
gst_sample_unref (sample);
msg = gst_message_new_element (GST_OBJECT (data->element), s);
GST_DEBUG_OBJECT (data->element, "sending message with preview image");
if (gst_element_post_message (data->element, msg) == FALSE) {
GST_WARNING_OBJECT (data->element,
"This element has no bus, therefore no message sent!");
}
g_mutex_lock (&data->processing_lock);
data->processing--;
if (data->processing == 0)
g_cond_signal (&data->processing_cond);
g_mutex_unlock (&data->processing_lock);
return GST_FLOW_OK;
}
/**
* gst_camerabin_create_preview_pipeline:
* @element: Owner of this pipeline
* @filter: Custom filter to process preview data (an extra ref is taken)
*
* Creates a new previewing pipeline that can receive buffers
* to be posted as camerabin preview messages for @element
*
* Returns: The newly created #GstCameraBinPreviewPipelineData
*/
GstCameraBinPreviewPipelineData *
gst_camerabin_create_preview_pipeline (GstElement * element,
GstElement * filter)
{
GstCameraBinPreviewPipelineData *data;
GstElement *csp;
GstElement *vscale;
gboolean added = FALSE;
gboolean linkfail = FALSE;
GstBus *bus;
GstAppSinkCallbacks callbacks = { 0, };
data = g_new0 (GstCameraBinPreviewPipelineData, 1);
data->pipeline = gst_pipeline_new ("preview-pipeline");
data->appsrc = gst_element_factory_make ("appsrc", "preview-appsrc");
data->appsink = gst_element_factory_make ("appsink", "preview-appsink");
csp = gst_element_factory_make ("videoconvert", "preview-vconv");
vscale = gst_element_factory_make ("videoscale", "preview-vscale");
if (!data->appsrc || !data->appsink || !csp || !vscale) {
goto error;
}
g_object_set (data->appsrc, "emit-signals", FALSE, NULL);
g_object_set (data->appsink, "sync", FALSE, "enable-last-sample",
FALSE, NULL);
gst_bin_add_many (GST_BIN (data->pipeline), data->appsrc,
data->appsink, csp, vscale, NULL);
if (filter)
gst_bin_add (GST_BIN (data->pipeline), gst_object_ref (filter));
added = TRUE;
if (filter) {
linkfail |=
GST_PAD_LINK_FAILED (gst_element_link_pads_full (data->appsrc, "src",
filter, NULL, GST_PAD_LINK_CHECK_NOTHING));
linkfail |=
GST_PAD_LINK_FAILED (gst_element_link_pads_full (filter, NULL,
vscale, "sink", GST_PAD_LINK_CHECK_CAPS));
} else {
linkfail |=
GST_PAD_LINK_FAILED (gst_element_link_pads_full (data->appsrc, "src",
vscale, "sink", GST_PAD_LINK_CHECK_NOTHING));
}
linkfail |=
GST_PAD_LINK_FAILED (gst_element_link_pads_full (vscale, "src", csp,
"sink", GST_PAD_LINK_CHECK_NOTHING));
linkfail |=
GST_PAD_LINK_FAILED (gst_element_link_pads_full (csp, "src",
data->appsink, "sink", GST_PAD_LINK_CHECK_NOTHING));
if (linkfail) {
GST_WARNING ("Failed to link preview pipeline elements");
goto error;
}
callbacks.new_sample = gst_camerabin_preview_pipeline_new_sample;
gst_app_sink_set_callbacks ((GstAppSink *) data->appsink, &callbacks, data,
NULL);
bus = gst_pipeline_get_bus (GST_PIPELINE (data->pipeline));
gst_bus_add_watch (bus, bus_callback, data);
gst_object_unref (bus);
g_object_set (data->appsink, "sync", FALSE, NULL);
data->element = element;
data->filter = filter;
data->vscale = vscale;
g_mutex_init (&data->processing_lock);
g_cond_init (&data->processing_cond);
data->pending_preview_caps = NULL;
data->processing = 0;
return data;
error:
GST_WARNING ("Failed to create camerabin's preview pipeline");
if (!added) {
if (csp)
gst_object_unref (csp);
if (vscale)
gst_object_unref (vscale);
if (data->appsrc)
gst_object_unref (data->appsrc);
if (data->appsink)
gst_object_unref (data->appsink);
}
gst_camerabin_destroy_preview_pipeline (data);
return NULL;
}
/**
* gst_camerabin_destroy_preview_pipeline:
* @preview: the #GstCameraBinPreviewPipelineData
*
* Frees a #GstCameraBinPreviewPipelineData
*/
void
gst_camerabin_destroy_preview_pipeline (GstCameraBinPreviewPipelineData *
preview)
{
g_return_if_fail (preview != NULL);
g_mutex_clear (&preview->processing_lock);
g_cond_clear (&preview->processing_cond);
if (preview->pipeline) {
gst_element_set_state (preview->pipeline, GST_STATE_NULL);
gst_object_unref (preview->pipeline);
}
g_free (preview);
}
/**
* gst_camerabin_preview_pipeline_post:
* @preview: the #GstCameraBinPreviewPipelineData
* @sample: the sample to be posted as a preview
*
* Converts the @sample to the desired format and posts the preview
* message to the bus.
*
* Returns: %TRUE on success
*/
gboolean
gst_camerabin_preview_pipeline_post (GstCameraBinPreviewPipelineData * preview,
GstSample * sample)
{
g_return_val_if_fail (preview != NULL, FALSE);
g_return_val_if_fail (preview->pipeline != NULL, FALSE);
g_return_val_if_fail (sample, FALSE);
g_mutex_lock (&preview->processing_lock);
g_return_val_if_fail (preview->pipeline != NULL, FALSE);
if (preview->pending_preview_caps) {
if (preview->processing > 0) {
g_cond_wait (&preview->processing_cond, &preview->processing_lock);
}
_gst_camerabin_preview_set_caps (preview, preview->pending_preview_caps);
gst_caps_replace (&preview->pending_preview_caps, NULL);
}
preview->processing++;
g_object_set (preview->appsrc, "caps", gst_sample_get_caps (sample), NULL);
gst_app_src_push_buffer ((GstAppSrc *) preview->appsrc,
gst_buffer_ref (gst_sample_get_buffer (sample)));
g_mutex_unlock (&preview->processing_lock);
return TRUE;
}
static void
_gst_camerabin_preview_set_caps (GstCameraBinPreviewPipelineData * preview,
GstCaps * caps)
{
GstState state, pending;
GstStateChangeReturn ret;
g_return_if_fail (preview != NULL);
g_return_if_fail (preview->pipeline != NULL);
ret = gst_element_get_state (preview->pipeline, &state, &pending, 0);
if (ret == GST_STATE_CHANGE_FAILURE) {
/* make it try again */
state = GST_STATE_PLAYING;
pending = GST_STATE_VOID_PENDING;
}
gst_element_set_state (preview->pipeline, GST_STATE_NULL);
g_object_set (preview->appsink, "caps", caps, NULL);
if (pending != GST_STATE_VOID_PENDING)
state = pending;
gst_element_set_state (preview->pipeline, state);
}
/**
* gst_camerabin_preview_set_caps:
* @preview: the #GstCameraBinPreviewPipelineData
* @caps: the #GstCaps to be set (a new ref will be taken)
*
* The caps that preview buffers should have when posted
* on the bus
*/
void
gst_camerabin_preview_set_caps (GstCameraBinPreviewPipelineData * preview,
GstCaps * caps)
{
g_return_if_fail (preview != NULL);
g_mutex_lock (&preview->processing_lock);
if (preview->processing == 0) {
_gst_camerabin_preview_set_caps (preview, caps);
} else {
GST_DEBUG ("Preview pipeline busy, storing new caps as pending");
gst_caps_replace (&preview->pending_preview_caps, caps);
}
g_mutex_unlock (&preview->processing_lock);
}
/**
* gst_camerabin_preview_set_filter:
* @preview: the #GstCameraBinPreviewPipelineData
* @filter: Custom filter to process preview data (an extra ref is taken)
*
* Set the filter element into preview pipeline.
*
* Returns: %TRUE on success
*/
gboolean
gst_camerabin_preview_set_filter (GstCameraBinPreviewPipelineData * preview,
GstElement * filter)
{
gboolean ret = TRUE;
GstState current;
g_return_val_if_fail (preview != NULL, FALSE);
GST_DEBUG ("Preview pipeline setting new filter %p", filter);
g_mutex_lock (&preview->processing_lock);
gst_element_get_state (preview->pipeline, &current, NULL, 0);
if (preview->processing == 0 && current == GST_STATE_NULL) {
gboolean linkfail = FALSE;
if (preview->filter) {
/* Unlink and remove old filter */
gst_element_unlink (preview->appsrc, preview->filter);
gst_element_unlink (preview->filter, preview->vscale);
gst_bin_remove (GST_BIN (preview->pipeline), preview->filter);
} else {
/* Make room for filter by breaking the link between appsrc and vcale */
gst_element_unlink (preview->appsrc, preview->vscale);
}
if (filter) {
/* Add and link the new filter between appsrc and vscale */
gst_bin_add (GST_BIN (preview->pipeline), gst_object_ref (filter));
linkfail |=
GST_PAD_LINK_FAILED (gst_element_link_pads_full (preview->appsrc,
"src", filter, NULL, GST_PAD_LINK_CHECK_NOTHING));
linkfail |=
GST_PAD_LINK_FAILED (gst_element_link_pads_full (filter, NULL,
preview->vscale, "sink", GST_PAD_LINK_CHECK_CAPS));
} else {
/* No filter was given. Just link the appsrc to vscale directly */
linkfail |=
GST_PAD_LINK_FAILED (gst_element_link_pads_full (preview->appsrc,
"src", preview->vscale, "sink", GST_PAD_LINK_CHECK_NOTHING));
}
if (linkfail) {
GST_WARNING ("Linking the filter to pipeline failed");
ret = FALSE;
} else {
GST_DEBUG ("Linking the filter to pipeline successful");
preview->filter = filter;
}
} else {
GST_WARNING ("Cannot change filter when pipeline is running");
ret = FALSE;
}
g_mutex_unlock (&preview->processing_lock);
return ret;
}