diff options
| -rw-r--r-- | docs/libs/gst-plugins-base-libs-sections.txt | 1 | ||||
| -rw-r--r-- | gst-libs/gst/video/Makefile.am | 2 | ||||
| -rw-r--r-- | gst-libs/gst/video/convertframe.c | 304 | ||||
| -rw-r--r-- | gst-libs/gst/video/video.h | 3 |
4 files changed, 309 insertions, 1 deletions
diff --git a/docs/libs/gst-plugins-base-libs-sections.txt b/docs/libs/gst-plugins-base-libs-sections.txt index 6bd32074d..ec88acbc5 100644 --- a/docs/libs/gst-plugins-base-libs-sections.txt +++ b/docs/libs/gst-plugins-base-libs-sections.txt @@ -1897,6 +1897,7 @@ gst_video_parse_caps_framerate gst_video_parse_caps_pixel_aspect_ratio gst_video_parse_caps_color_matrix gst_video_parse_caps_chroma_site +gst_video_convert_frame </SECTION> <SECTION> diff --git a/gst-libs/gst/video/Makefile.am b/gst-libs/gst/video/Makefile.am index 7d065c965..e44ce80c9 100644 --- a/gst-libs/gst/video/Makefile.am +++ b/gst-libs/gst/video/Makefile.am @@ -13,7 +13,7 @@ lib_LTLIBRARIES = libgstvideo-@GST_MAJORMINOR@.la CLEANFILES = $(BUILT_SOURCES) libgstvideo_@GST_MAJORMINOR@_la_SOURCES = \ - video.c gstvideosink.c gstvideofilter.c + video.c gstvideosink.c gstvideofilter.c convertframe.c nodist_libgstvideo_@GST_MAJORMINOR@_la_SOURCES = $(BUILT_SOURCES) libgstvideo_@GST_MAJORMINOR@includedir = $(includedir)/gstreamer-@GST_MAJORMINOR@/gst/video diff --git a/gst-libs/gst/video/convertframe.c b/gst-libs/gst/video/convertframe.c new file mode 100644 index 000000000..f99a695df --- /dev/null +++ b/gst-libs/gst/video/convertframe.c @@ -0,0 +1,304 @@ +/* Small helper element for format conversion + * Copyright (C) 2005 Tim-Philipp Müller <tim centricular net> + * Copyright (C) 2010 Brandon Lewis <brandon.lewis@collabora.co.uk> + * Copyright (C) 2010 Edward Hervey <edward.hervey@collabora.co.uk> + * + * 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. + */ + +#include <string.h> +#include "video.h" + +static gboolean +caps_are_raw (const GstCaps * caps) +{ + guint i, len; + + len = gst_caps_get_size (caps); + + for (i = 0; i < len; i++) { + GstStructure *st = gst_caps_get_structure (caps, i); + if (gst_structure_has_name (st, "video/x-raw-yuv") || + gst_structure_has_name (st, "video/x-raw-rgb")) + return TRUE; + } + + return FALSE; +} + +static gboolean +create_element (const gchar * factory_name, GstElement ** element, + GError ** err) +{ + *element = gst_element_factory_make (factory_name, NULL); + 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; +} + +static GstElement * +get_encoder (const GstCaps * caps, GError ** err) +{ + GList *encoders = NULL; + GList *filtered = NULL; + GstElementFactory *factory = NULL; + GstElement *encoder = NULL; + + encoders = + gst_element_factory_list_get_elements (GST_ELEMENT_FACTORY_TYPE_ENCODER | + GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE, GST_RANK_NONE); + + if (encoders == NULL) { + *err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_MISSING_PLUGIN, + "Cannot find any image encoder"); + goto fail; + } + + GST_INFO ("got factory list %p", encoders); + gst_plugin_feature_list_debug (encoders); + + filtered = + gst_element_factory_list_filter (encoders, caps, GST_PAD_SRC, FALSE); + GST_INFO ("got filtered list %p", filtered); + + if (filtered == NULL) { + gchar *tmp = gst_caps_to_string (caps); + *err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_MISSING_PLUGIN, + "Cannot find any image encoder for caps %s", tmp); + g_free (tmp); + goto fail; + } + + gst_plugin_feature_list_debug (filtered); + + factory = (GstElementFactory *) filtered->data; + + GST_INFO ("got factory %p", factory); + encoder = gst_element_factory_create (factory, NULL); + + GST_INFO ("created encoder element %p, %s", encoder, + gst_element_get_name (encoder)); + +fail: + if (encoders) + gst_plugin_feature_list_free (encoders); + if (filtered) + gst_plugin_feature_list_free (filtered); + + return encoder; +} + +/** + * gst_video_convert_frame: + * @buf: a #GstBuffer + * @to_caps: the #GstCaps to convert to + * @timeout: the maximum amount of time allowed for the processing. + * @err: pointer to a #GError. Can be %NULL. + * + * Converts a raw video buffer into the specified output caps. + * + * The output caps can be any raw video formats or any image formats (jpeg, png, ...). + * + * The width, height and pixel-aspect-ratio can also be specified in the output caps. + * + * Returns: The converted #GstBuffer, or %NULL if an error happened (in which case @err + * will point to the #GError). + */ +GstBuffer * +gst_video_convert_frame (GstBuffer * buf, const GstCaps * to_caps, + GstClockTime timeout, GError ** err) +{ + GstElement *src = NULL, *csp = NULL, *vscale = NULL, *sink = NULL, *encoder = + NULL, *pipeline; + GstMessage *msg; + GstBuffer *result = NULL; + GError *error = NULL; + GstBus *bus; + GstCaps *from_caps; + GstFlowReturn ret; + + g_return_val_if_fail (buf != NULL, NULL); + g_return_val_if_fail (to_caps != NULL, NULL); + g_return_val_if_fail (GST_BUFFER_CAPS (buf) != NULL, NULL); + + from_caps = GST_BUFFER_CAPS (buf); + + /* videoscale is here to correct for the pixel-aspect-ratio for us */ + GST_DEBUG ("creating elements"); + if (!create_element ("appsrc", &src, &error) || + !create_element ("ffmpegcolorspace", &csp, &error) || + !create_element ("videoscale", &vscale, &error) || + !create_element ("appsink", &sink, &error)) + goto no_elements; + + pipeline = gst_pipeline_new ("videoconvert-pipeline"); + if (pipeline == NULL) + goto no_pipeline; + + /* Add black borders if necessary to keep the DAR */ + g_object_set (vscale, "add-borders", TRUE, NULL); + + GST_DEBUG ("adding elements"); + gst_bin_add_many (GST_BIN (pipeline), src, csp, vscale, sink, NULL); + + /* set caps */ + g_object_set (src, "caps", from_caps, NULL); + g_object_set (sink, "caps", to_caps, NULL); + + /* FIXME: linking is still way too expensive, profile this properly */ + GST_DEBUG ("linking src->csp"); + if (!gst_element_link_pads (src, "src", csp, "sink")) + goto link_failed; + + GST_DEBUG ("linking csp->vscale"); + if (!gst_element_link_pads (csp, "src", vscale, "sink")) + goto link_failed; + + if (caps_are_raw (to_caps)) { + GST_DEBUG ("linking vscale->sink"); + + if (!gst_element_link_pads (vscale, "src", sink, "sink")) + goto link_failed; + } else { + encoder = get_encoder (to_caps, &error); + if (!encoder) + goto no_encoder; + gst_bin_add (GST_BIN (pipeline), encoder); + + GST_DEBUG ("linking vscale->encoder"); + if (!gst_element_link (vscale, encoder)) + goto link_failed; + + GST_DEBUG ("linking encoder->sink"); + if (!gst_element_link_pads (encoder, "src", sink, "sink")) + goto link_failed; + } + + /* now set the pipeline to the paused state, after we push the buffer into + * appsrc, this should preroll the converted buffer in appsink */ + GST_DEBUG ("running conversion pipeline to caps %" GST_PTR_FORMAT, to_caps); + gst_element_set_state (pipeline, GST_STATE_PAUSED); + + /* feed buffer in appsrc */ + GST_DEBUG ("feeding buffer %p, size %u, caps %" GST_PTR_FORMAT, + buf, GST_BUFFER_SIZE (buf), from_caps); + g_signal_emit_by_name (src, "push-buffer", buf, &ret); + + /* now see what happens. We either got an error somewhere or the pipeline + * prerolled */ + bus = gst_element_get_bus (pipeline); + msg = gst_bus_timed_pop_filtered (bus, + timeout, GST_MESSAGE_ERROR | GST_MESSAGE_ASYNC_DONE); + + if (msg) { + switch (GST_MESSAGE_TYPE (msg)) { + case GST_MESSAGE_ASYNC_DONE: + { + /* we're prerolled, get the frame from appsink */ + g_signal_emit_by_name (sink, "pull-preroll", &result); + + if (result) { + GST_DEBUG ("conversion successful: result = %p", result); + } else { + GST_ERROR ("prerolled but no result frame?!"); + } + break; + } + case GST_MESSAGE_ERROR:{ + gchar *dbg = NULL; + + gst_message_parse_error (msg, &error, &dbg); + if (error) { + GST_ERROR ("Could not convert video frame: %s", error->message); + GST_DEBUG ("%s [debug: %s]", error->message, GST_STR_NULL (dbg)); + if (err) + *err = error; + else + g_error_free (error); + } + g_free (dbg); + break; + } + default:{ + g_return_val_if_reached (NULL); + } + } + gst_message_unref (msg); + } else { + GST_ERROR ("Could not convert video frame: timeout during conversion"); + if (err) + *err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_FAILED, + "Could not convert video frame: timeout during conversion"); + } + + gst_element_set_state (pipeline, GST_STATE_NULL); + gst_object_unref (bus); + gst_object_unref (pipeline); + + return result; + + /* ERRORS */ +no_encoder: + { + GST_ERROR ("could not find an encoder for provided caps"); + if (err) + *err = error; + else + g_error_free (error); + return NULL; + } +no_elements: + { + if (src) + gst_object_unref (src); + if (csp) + gst_object_unref (csp); + if (vscale) + gst_object_unref (vscale); + if (sink) + gst_object_unref (sink); + GST_ERROR ("Could not convert video frame: %s", error->message); + if (err) + *err = error; + else + g_error_free (error); + return NULL; + } +no_pipeline: + { + GST_ERROR ("Could not convert video frame: no pipeline (unknown error)"); + if (err) + *err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_FAILED, + "Could not convert video frame: no pipeline (unknown error)"); + return NULL; + } +link_failed: + { + GST_ERROR ("Could not convert video frame: failed to link elements"); + if (err) + *err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_NEGOTIATION, + "Could not convert video frame: failed to link elements"); + gst_object_unref (pipeline); + return NULL; + } +} diff --git a/gst-libs/gst/video/video.h b/gst-libs/gst/video/video.h index 94ed28edb..205505748 100644 --- a/gst-libs/gst/video/video.h +++ b/gst-libs/gst/video/video.h @@ -413,6 +413,9 @@ gboolean gst_video_format_convert (GstVideoFormat format, int width, int height, GstEvent *gst_video_event_new_still_frame (gboolean in_still); gboolean gst_video_event_parse_still_frame (GstEvent *event, gboolean *in_still); +GstBuffer *gst_video_convert_frame(GstBuffer *buf, const GstCaps *to_caps, + GstClockTime timeout, GError **error); + G_END_DECLS #endif /* __GST_VIDEO_H__ */ |