diff options
Diffstat (limited to 'gst/camerabin/camerabinpreview.c')
-rw-r--r-- | gst/camerabin/camerabinpreview.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/gst/camerabin/camerabinpreview.c b/gst/camerabin/camerabinpreview.c new file mode 100644 index 00000000..b64b2143 --- /dev/null +++ b/gst/camerabin/camerabinpreview.c @@ -0,0 +1,257 @@ +/* +* GStreamer +* Copyright (C) 2009 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., 59 Temple Place - Suite 330, +* Boston, MA 02111-1307, USA. +*/ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <gst/gst.h> +#include <string.h> + +#include "camerabingeneral.h" +#include "camerabinpreview.h" + +static void +save_result (GstElement * sink, GstBuffer * buf, GstPad * pad, gpointer data) +{ + GstBuffer **p_buf = (GstBuffer **) data; + + *p_buf = gst_buffer_ref (buf); + + GST_DEBUG ("received converted buffer %p with caps %" GST_PTR_FORMAT, + *p_buf, GST_BUFFER_CAPS (*p_buf)); +} + +static gboolean +create_element (const gchar * factory_name, const gchar * elem_name, + GstElement ** element, GError ** err) +{ + *element = gst_element_factory_make (factory_name, elem_name); + if (*element) + return TRUE; + + if (err && *err == NULL) { + *err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_MISSING_PLUGIN, + "cannot create element '%s' - please check your GStreamer installation", + factory_name); + } + + return FALSE; +} + + +/** + * gst_camerabin_preview_create_pipeline: + * @camera: camerabin object + * + * Create a preview converter pipeline. + * + * Returns: TRUE if pipeline was constructed, otherwise FALSE. + */ +gboolean +gst_camerabin_preview_create_pipeline (GstCameraBin * camera) +{ + GstElement *src, *csp, *filter, *vscale, *sink; + GError *error = NULL; + + if (!camera->preview_caps) { + return FALSE; + } + + /* Destroy old pipeline, if any */ + gst_camerabin_preview_destroy_pipeline (camera); + + GST_DEBUG ("creating elements"); + + if (!create_element ("appsrc", "prev_src", &src, &error) || + !create_element ("videoscale", NULL, &vscale, &error) || + !create_element ("ffmpegcolorspace", NULL, &csp, &error) || + !create_element ("capsfilter", NULL, &filter, &error) || + !create_element ("fakesink", "prev_sink", &sink, &error)) + goto no_elements; + + camera->preview_pipeline = gst_pipeline_new ("preview-pipeline"); + if (camera->preview_pipeline == NULL) + goto no_pipeline; + + GST_DEBUG ("adding elements"); + gst_bin_add_many (GST_BIN (camera->preview_pipeline), + src, csp, filter, vscale, sink, NULL); + + g_object_set (filter, "caps", camera->preview_caps, NULL); + g_object_set (sink, "preroll-queue-len", 1, "signal-handoffs", TRUE, NULL); + g_object_set (vscale, "method", 0, NULL); + + /* FIXME: linking is still way too expensive, profile this properly */ + GST_DEBUG ("linking src->vscale"); + if (!gst_element_link_pads (src, "src", vscale, "sink")) + return FALSE; + + GST_DEBUG ("linking vscale->csp"); + if (!gst_element_link_pads (vscale, "src", csp, "sink")) + return FALSE; + + GST_DEBUG ("linking csp->capsfilter"); + if (!gst_element_link_pads (csp, "src", filter, "sink")) + return FALSE; + + GST_DEBUG ("linking capsfilter->sink"); + if (!gst_element_link_pads (filter, "src", sink, "sink")) + return FALSE; + + return TRUE; + + /* ERRORS */ +no_elements: + { + g_warning ("Could not make preview pipeline: %s", error->message); + g_error_free (error); + return FALSE; + } +no_pipeline: + { + g_warning ("Could not make preview pipeline: %s", + "no pipeline (unknown error)"); + return FALSE; + } +} + + +/** + * gst_camerabin_preview_destroy_pipeline: + * @camera: camerabin object + * + * Destroy preview converter pipeline. + */ +void +gst_camerabin_preview_destroy_pipeline (GstCameraBin * camera) +{ + if (camera->preview_pipeline) { + gst_element_set_state (camera->preview_pipeline, GST_STATE_NULL); + gst_object_unref (camera->preview_pipeline); + camera->preview_pipeline = NULL; + } +} + + +/** + * gst_camerabin_preview_convert: + * @camera: camerabin object + * @buf: #GstBuffer that contains the frame to be converted + * + * Create a preview image of the given frame. + * + * Returns: converted preview image, or NULL if operation failed. + */ +GstBuffer * +gst_camerabin_preview_convert (GstCameraBin * camera, GstBuffer * buf) +{ + GstMessage *msg; + GstBuffer *result = NULL; + GError *error = NULL; + GstBus *bus; + GstElement *src, *sink; + GstBufferFlag bflags; + GstFlowReturn fret; + + g_return_val_if_fail (GST_BUFFER_CAPS (buf) != NULL, NULL); + + if (camera->preview_pipeline == NULL) { + GST_WARNING ("pipeline is NULL"); + goto no_pipeline; + } + + src = gst_bin_get_by_name (GST_BIN (camera->preview_pipeline), "prev_src"); + sink = gst_bin_get_by_name (GST_BIN (camera->preview_pipeline), "prev_sink"); + + if (!src || !sink) { + GST_WARNING ("pipeline doesn't have src / sink elements"); + goto no_pipeline; + } + + g_object_set (src, "size", (gint64) GST_BUFFER_SIZE (buf), + "blocksize", (guint32) GST_BUFFER_SIZE (buf), + "caps", GST_BUFFER_CAPS (buf), "num-buffers", 1, NULL); + + g_signal_connect (sink, "handoff", G_CALLBACK (save_result), &result); + + bflags = GST_BUFFER_FLAGS (buf); + GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_READONLY); + + GST_DEBUG ("running conversion pipeline"); + gst_element_set_state (camera->preview_pipeline, GST_STATE_PLAYING); + + g_signal_emit_by_name (src, "push-buffer", buf, &fret); + + /* TODO: do we need to use a bus poll, can we just register a callback to the bus? */ + bus = gst_element_get_bus (camera->preview_pipeline); + msg = + gst_bus_poll (bus, GST_MESSAGE_ERROR | GST_MESSAGE_EOS, 25 * GST_SECOND); + + if (msg) { + switch (GST_MESSAGE_TYPE (msg)) { + case GST_MESSAGE_EOS:{ + if (result) { + GST_DEBUG ("preview image successful: result = %p", result); + } else { + GST_WARNING ("EOS but no result frame?!"); + } + break; + } + case GST_MESSAGE_ERROR:{ + gchar *dbg = NULL; + + gst_message_parse_error (msg, &error, &dbg); + if (error) { + g_warning ("Could not make preview image: %s", error->message); + GST_DEBUG ("%s [debug: %s]", error->message, GST_STR_NULL (dbg)); + g_error_free (error); + } else { + g_warning ("Could not make preview image (and NULL error!)"); + } + g_free (dbg); + result = NULL; + break; + } + default:{ + g_return_val_if_reached (NULL); + } + } + } else { + g_warning ("Could not make preview image: %s", "timeout during conversion"); + result = NULL; + } + + g_signal_handlers_disconnect_by_func (sink, G_CALLBACK (save_result), + &result); + gst_element_set_state (camera->preview_pipeline, GST_STATE_READY); + + GST_BUFFER_FLAGS (buf) = bflags; + + return result; + + /* ERRORS */ +no_pipeline: + { + g_warning ("Could not make preview image: %s", + "no pipeline (unknown error)"); + return NULL; + } +} |