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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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508 lines
17 KiB
C
508 lines
17 KiB
C
/* GStreamer
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* Copyright (C) 2011 David A. Schleef <ds@schleef.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., 51 Franklin Street, Suite 500,
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* Boston, MA 02110-1335, USA.
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*/
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/**
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* SECTION:element-intervideosrc
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* @title: gstintervideosrc
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*
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* The intervideosrc element is a video source element. It is used
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* in connection with a intervideosink element in a different pipeline,
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* similar to interaudiosink and interaudiosrc.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -v intervideosrc ! queue ! xvimagesink
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* ]|
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*
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* The intersubsrc element cannot be used effectively with gst-launch-1.0,
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* as it requires a second pipeline in the application to send subtitles.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gst/base/gstbasesrc.h>
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#include <gst/video/video.h>
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#include "gstintervideosrc.h"
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#include <string.h>
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GST_DEBUG_CATEGORY_STATIC (gst_inter_video_src_debug_category);
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#define GST_CAT_DEFAULT gst_inter_video_src_debug_category
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/* prototypes */
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static void gst_inter_video_src_set_property (GObject * object,
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guint property_id, const GValue * value, GParamSpec * pspec);
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static void gst_inter_video_src_get_property (GObject * object,
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guint property_id, GValue * value, GParamSpec * pspec);
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static void gst_inter_video_src_finalize (GObject * object);
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static GstCaps *gst_inter_video_src_get_caps (GstBaseSrc * src,
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GstCaps * filter);
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static gboolean gst_inter_video_src_set_caps (GstBaseSrc * src, GstCaps * caps);
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static GstCaps *gst_inter_video_src_fixate (GstBaseSrc * src, GstCaps * caps);
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static gboolean gst_inter_video_src_start (GstBaseSrc * src);
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static gboolean gst_inter_video_src_stop (GstBaseSrc * src);
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static void
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gst_inter_video_src_get_times (GstBaseSrc * src, GstBuffer * buffer,
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GstClockTime * start, GstClockTime * end);
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static GstFlowReturn
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gst_inter_video_src_create (GstBaseSrc * src, guint64 offset, guint size,
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GstBuffer ** buf);
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enum
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{
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PROP_0,
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PROP_CHANNEL,
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PROP_TIMEOUT
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};
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#define DEFAULT_CHANNEL ("default")
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#define DEFAULT_TIMEOUT (GST_SECOND)
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/* pad templates */
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static GstStaticPadTemplate gst_inter_video_src_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (GST_VIDEO_FORMATS_ALL))
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);
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/* class initialization */
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#define parent_class gst_inter_video_src_parent_class
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G_DEFINE_TYPE (GstInterVideoSrc, gst_inter_video_src, GST_TYPE_BASE_SRC);
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GST_ELEMENT_REGISTER_DEFINE (intervideosrc, "intervideosrc",
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GST_RANK_NONE, GST_TYPE_INTER_VIDEO_SRC);
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static void
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gst_inter_video_src_class_init (GstInterVideoSrcClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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GstBaseSrcClass *base_src_class = GST_BASE_SRC_CLASS (klass);
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GST_DEBUG_CATEGORY_INIT (gst_inter_video_src_debug_category, "intervideosrc",
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0, "debug category for intervideosrc element");
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gst_element_class_add_static_pad_template (element_class,
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&gst_inter_video_src_src_template);
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gst_element_class_set_static_metadata (element_class,
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"Internal video source",
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"Source/Video",
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"Virtual video source for internal process communication",
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"David Schleef <ds@schleef.org>");
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gobject_class->set_property = gst_inter_video_src_set_property;
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gobject_class->get_property = gst_inter_video_src_get_property;
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gobject_class->finalize = gst_inter_video_src_finalize;
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base_src_class->get_caps = GST_DEBUG_FUNCPTR (gst_inter_video_src_get_caps);
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base_src_class->set_caps = GST_DEBUG_FUNCPTR (gst_inter_video_src_set_caps);
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base_src_class->fixate = GST_DEBUG_FUNCPTR (gst_inter_video_src_fixate);
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base_src_class->start = GST_DEBUG_FUNCPTR (gst_inter_video_src_start);
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base_src_class->stop = GST_DEBUG_FUNCPTR (gst_inter_video_src_stop);
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base_src_class->get_times = GST_DEBUG_FUNCPTR (gst_inter_video_src_get_times);
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base_src_class->create = GST_DEBUG_FUNCPTR (gst_inter_video_src_create);
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g_object_class_install_property (gobject_class, PROP_CHANNEL,
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g_param_spec_string ("channel", "Channel",
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"Channel name to match inter src and sink elements",
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DEFAULT_CHANNEL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_TIMEOUT,
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g_param_spec_uint64 ("timeout", "Timeout",
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"Timeout after which to start outputting black frames",
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0, G_MAXUINT64, DEFAULT_TIMEOUT,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}
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static void
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gst_inter_video_src_init (GstInterVideoSrc * intervideosrc)
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{
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gst_base_src_set_format (GST_BASE_SRC (intervideosrc), GST_FORMAT_TIME);
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gst_base_src_set_live (GST_BASE_SRC (intervideosrc), TRUE);
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intervideosrc->channel = g_strdup (DEFAULT_CHANNEL);
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intervideosrc->timeout = DEFAULT_TIMEOUT;
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}
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void
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gst_inter_video_src_set_property (GObject * object, guint property_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object);
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switch (property_id) {
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case PROP_CHANNEL:
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g_free (intervideosrc->channel);
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intervideosrc->channel = g_value_dup_string (value);
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break;
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case PROP_TIMEOUT:
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intervideosrc->timeout = g_value_get_uint64 (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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void
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gst_inter_video_src_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec)
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{
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GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object);
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switch (property_id) {
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case PROP_CHANNEL:
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g_value_set_string (value, intervideosrc->channel);
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break;
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case PROP_TIMEOUT:
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g_value_set_uint64 (value, intervideosrc->timeout);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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void
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gst_inter_video_src_finalize (GObject * object)
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{
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GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object);
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/* clean up object here */
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g_free (intervideosrc->channel);
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G_OBJECT_CLASS (gst_inter_video_src_parent_class)->finalize (object);
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}
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static GstCaps *
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gst_inter_video_src_get_caps (GstBaseSrc * src, GstCaps * filter)
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{
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GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);
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GstCaps *caps;
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GST_DEBUG_OBJECT (intervideosrc, "get_caps");
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if (!intervideosrc->surface)
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return GST_BASE_SRC_CLASS (parent_class)->get_caps (src, filter);
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g_mutex_lock (&intervideosrc->surface->mutex);
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if (intervideosrc->surface->video_info.finfo) {
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caps = gst_video_info_to_caps (&intervideosrc->surface->video_info);
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gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION_RANGE, 1,
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G_MAXINT, G_MAXINT, 1, NULL);
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if (filter) {
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GstCaps *tmp;
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tmp = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
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gst_caps_unref (caps);
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caps = tmp;
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}
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} else {
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caps = NULL;
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}
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g_mutex_unlock (&intervideosrc->surface->mutex);
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if (caps)
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return caps;
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else
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return GST_BASE_SRC_CLASS (parent_class)->get_caps (src, filter);
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}
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static gboolean
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gst_inter_video_src_set_caps (GstBaseSrc * base, GstCaps * caps)
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{
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GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (base);
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GstVideoConverter *converter;
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GstVideoFrame src_frame, dest_frame;
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GstBuffer *src, *dest;
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GstVideoInfo black_info;
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GST_DEBUG_OBJECT (intervideosrc, "set_caps");
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if (!gst_video_info_from_caps (&intervideosrc->info, caps)) {
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GST_ERROR_OBJECT (intervideosrc, "Failed to parse caps %" GST_PTR_FORMAT,
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caps);
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return FALSE;
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}
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/* Create a black frame */
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gst_buffer_replace (&intervideosrc->black_frame, NULL);
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gst_video_info_set_format (&black_info, GST_VIDEO_FORMAT_ARGB,
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intervideosrc->info.width, intervideosrc->info.height);
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black_info.fps_n = intervideosrc->info.fps_n;
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black_info.fps_d = intervideosrc->info.fps_d;
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src = gst_buffer_new_and_alloc (black_info.size);
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dest = gst_buffer_new_and_alloc (intervideosrc->info.size);
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gst_buffer_memset (src, 0, 0, black_info.size);
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gst_video_frame_map (&src_frame, &black_info, src, GST_MAP_READ);
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gst_video_frame_map (&dest_frame, &intervideosrc->info, dest, GST_MAP_WRITE);
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converter = gst_video_converter_new (&black_info, &intervideosrc->info, NULL);
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gst_video_converter_frame (converter, &src_frame, &dest_frame);
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gst_video_converter_free (converter);
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gst_video_frame_unmap (&src_frame);
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gst_video_frame_unmap (&dest_frame);
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gst_buffer_unref (src);
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intervideosrc->black_frame = dest;
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return TRUE;
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}
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static gboolean
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gst_inter_video_src_start (GstBaseSrc * src)
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{
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GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);
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GST_DEBUG_OBJECT (intervideosrc, "start");
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intervideosrc->surface = gst_inter_surface_get (intervideosrc->channel);
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intervideosrc->timestamp_offset = 0;
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intervideosrc->n_frames = 0;
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return TRUE;
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}
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static gboolean
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gst_inter_video_src_stop (GstBaseSrc * src)
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{
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GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);
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GST_DEBUG_OBJECT (intervideosrc, "stop");
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gst_inter_surface_unref (intervideosrc->surface);
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intervideosrc->surface = NULL;
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gst_buffer_replace (&intervideosrc->black_frame, NULL);
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return TRUE;
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}
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static void
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gst_inter_video_src_get_times (GstBaseSrc * src, GstBuffer * buffer,
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GstClockTime * start, GstClockTime * end)
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{
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GST_DEBUG_OBJECT (src, "get_times");
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/* for live sources, sync on the timestamp of the buffer */
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if (gst_base_src_is_live (src)) {
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GstClockTime timestamp = GST_BUFFER_PTS (buffer);
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if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
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/* get duration to calculate end time */
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GstClockTime duration = GST_BUFFER_DURATION (buffer);
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if (GST_CLOCK_TIME_IS_VALID (duration)) {
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*end = timestamp + duration;
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}
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*start = timestamp;
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}
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} else {
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*start = -1;
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*end = -1;
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}
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}
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static GstFlowReturn
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gst_inter_video_src_create (GstBaseSrc * src, guint64 offset, guint size,
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GstBuffer ** buf)
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{
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GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);
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GstCaps *caps;
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GstBuffer *buffer;
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guint64 frames;
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gboolean is_gap = FALSE;
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GST_DEBUG_OBJECT (intervideosrc, "create");
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caps = NULL;
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buffer = NULL;
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frames = gst_util_uint64_scale_ceil (intervideosrc->timeout,
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GST_VIDEO_INFO_FPS_N (&intervideosrc->info),
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GST_VIDEO_INFO_FPS_D (&intervideosrc->info) * GST_SECOND);
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g_mutex_lock (&intervideosrc->surface->mutex);
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if (intervideosrc->surface->video_info.finfo) {
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GstVideoInfo tmp_info = intervideosrc->surface->video_info;
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/* We negotiate the framerate ourselves */
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tmp_info.fps_n = intervideosrc->info.fps_n;
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tmp_info.fps_d = intervideosrc->info.fps_d;
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if (intervideosrc->info.flags & GST_VIDEO_FLAG_VARIABLE_FPS)
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tmp_info.flags |= GST_VIDEO_FLAG_VARIABLE_FPS;
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else
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tmp_info.flags &= ~GST_VIDEO_FLAG_VARIABLE_FPS;
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if (!gst_video_info_is_equal (&tmp_info, &intervideosrc->info)) {
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caps = gst_video_info_to_caps (&tmp_info);
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intervideosrc->timestamp_offset +=
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gst_util_uint64_scale (GST_SECOND * intervideosrc->n_frames,
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GST_VIDEO_INFO_FPS_D (&intervideosrc->info),
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GST_VIDEO_INFO_FPS_N (&intervideosrc->info));
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intervideosrc->n_frames = 0;
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}
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}
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if (intervideosrc->surface->video_buffer) {
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/* We have a buffer to push */
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buffer = gst_buffer_ref (intervideosrc->surface->video_buffer);
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/* Can only be true if timeout > 0 */
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if (intervideosrc->surface->video_buffer_count == frames) {
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gst_buffer_unref (intervideosrc->surface->video_buffer);
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intervideosrc->surface->video_buffer = NULL;
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}
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}
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if (intervideosrc->surface->video_buffer_count != 0 &&
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intervideosrc->surface->video_buffer_count != (frames + 1)) {
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/* This is a repeat of the stored buffer or of a black frame */
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is_gap = TRUE;
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}
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intervideosrc->surface->video_buffer_count++;
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g_mutex_unlock (&intervideosrc->surface->mutex);
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if (caps) {
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gboolean ret;
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GstStructure *s;
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GstCaps *downstream_caps;
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GstCaps *tmp, *negotiated_caps;
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gint fps_n = 0, fps_d = 1;
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/* Negotiate a framerate with downstream */
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downstream_caps = gst_pad_get_allowed_caps (GST_BASE_SRC_PAD (src));
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/* Remove all framerates */
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tmp = gst_caps_copy (caps);
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s = gst_caps_get_structure (tmp, 0);
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gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);
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if (fps_n == 0)
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gst_structure_get_fraction (s, "max-framerate", &fps_n, &fps_d);
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gst_structure_remove_field (s, "framerate");
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gst_structure_remove_field (s, "max-framerate");
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negotiated_caps =
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gst_caps_intersect_full (downstream_caps, tmp,
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GST_CAPS_INTERSECT_FIRST);
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gst_caps_unref (tmp);
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gst_caps_unref (downstream_caps);
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if (gst_caps_is_empty (negotiated_caps)) {
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GST_ERROR_OBJECT (src, "Failed to negotiate caps %" GST_PTR_FORMAT, caps);
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if (buffer)
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gst_buffer_unref (buffer);
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gst_caps_unref (caps);
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return GST_FLOW_NOT_NEGOTIATED;
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}
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gst_caps_unref (caps);
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caps = NULL;
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/* Prefer what the source produces, otherwise 30 fps */
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if (fps_n == 0) {
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fps_n = 30;
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fps_d = 1;
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}
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negotiated_caps = gst_caps_truncate (negotiated_caps);
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s = gst_caps_get_structure (negotiated_caps, 0);
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if (!gst_structure_has_field (s, "framerate"))
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gst_structure_set (s, "framerate", GST_TYPE_FRACTION, fps_n, fps_d, NULL);
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else
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gst_structure_fixate_field_nearest_fraction (s, "framerate", fps_n,
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fps_d);
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ret = gst_base_src_set_caps (src, negotiated_caps);
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if (!ret) {
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GST_ERROR_OBJECT (src, "Failed to set caps %" GST_PTR_FORMAT,
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negotiated_caps);
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if (buffer)
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gst_buffer_unref (buffer);
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gst_caps_unref (negotiated_caps);
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return GST_FLOW_NOT_NEGOTIATED;
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}
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gst_caps_unref (negotiated_caps);
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}
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if (buffer == NULL) {
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GST_DEBUG_OBJECT (intervideosrc, "Creating black frame");
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buffer = gst_buffer_copy (intervideosrc->black_frame);
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}
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buffer = gst_buffer_make_writable (buffer);
|
|
|
|
if (is_gap)
|
|
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_GAP);
|
|
|
|
GST_BUFFER_PTS (buffer) = intervideosrc->timestamp_offset +
|
|
gst_util_uint64_scale (GST_SECOND * intervideosrc->n_frames,
|
|
GST_VIDEO_INFO_FPS_D (&intervideosrc->info),
|
|
GST_VIDEO_INFO_FPS_N (&intervideosrc->info));
|
|
GST_BUFFER_DTS (buffer) = GST_CLOCK_TIME_NONE;
|
|
GST_DEBUG_OBJECT (intervideosrc, "create ts %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (GST_BUFFER_PTS (buffer)));
|
|
GST_BUFFER_DURATION (buffer) = intervideosrc->timestamp_offset +
|
|
gst_util_uint64_scale (GST_SECOND * (intervideosrc->n_frames + 1),
|
|
GST_VIDEO_INFO_FPS_D (&intervideosrc->info),
|
|
GST_VIDEO_INFO_FPS_N (&intervideosrc->info)) - GST_BUFFER_PTS (buffer);
|
|
GST_BUFFER_OFFSET (buffer) = intervideosrc->n_frames;
|
|
GST_BUFFER_OFFSET_END (buffer) = -1;
|
|
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DISCONT);
|
|
if (intervideosrc->n_frames == 0) {
|
|
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
|
|
}
|
|
intervideosrc->n_frames++;
|
|
|
|
*buf = buffer;
|
|
|
|
return GST_FLOW_OK;
|
|
}
|
|
|
|
static GstCaps *
|
|
gst_inter_video_src_fixate (GstBaseSrc * src, GstCaps * caps)
|
|
{
|
|
GstStructure *structure;
|
|
|
|
GST_DEBUG_OBJECT (src, "fixate");
|
|
|
|
caps = gst_caps_make_writable (caps);
|
|
caps = gst_caps_truncate (caps);
|
|
structure = gst_caps_get_structure (caps, 0);
|
|
|
|
gst_structure_fixate_field_string (structure, "format", "I420");
|
|
gst_structure_fixate_field_nearest_int (structure, "width", 320);
|
|
gst_structure_fixate_field_nearest_int (structure, "height", 240);
|
|
gst_structure_fixate_field_nearest_fraction (structure, "framerate", 30, 1);
|
|
if (gst_structure_has_field (structure, "pixel-aspect-ratio"))
|
|
gst_structure_fixate_field_nearest_fraction (structure,
|
|
"pixel-aspect-ratio", 1, 1);
|
|
if (gst_structure_has_field (structure, "color-matrix"))
|
|
gst_structure_fixate_field_string (structure, "color-matrix", "sdtv");
|
|
if (gst_structure_has_field (structure, "chroma-site"))
|
|
gst_structure_fixate_field_string (structure, "chroma-site", "mpeg2");
|
|
|
|
if (gst_structure_has_field (structure, "interlace-mode"))
|
|
gst_structure_fixate_field_string (structure, "interlace-mode",
|
|
"progressive");
|
|
|
|
return caps;
|
|
}
|