/* GStreamer * Copyright (C) 2011 David A. Schleef * * 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 Street, Suite 500, * Boston, MA 02110-1335, USA. */ /** * SECTION:element-gstintervideosrc * * The intervideosrc element is a video source element. It is used * in connection with a intervideosink element in a different pipeline, * similar to interaudiosink and interaudiosrc. * * * Example launch line * |[ * gst-launch -v intervideosrc ! queue ! xvimagesink * ]| * * The intersubsrc element cannot be used effectively with gst-launch, * as it requires a second pipeline in the application to send subtitles. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "gstintervideosrc.h" #include GST_DEBUG_CATEGORY_STATIC (gst_inter_video_src_debug_category); #define GST_CAT_DEFAULT gst_inter_video_src_debug_category /* prototypes */ static void gst_inter_video_src_set_property (GObject * object, guint property_id, const GValue * value, GParamSpec * pspec); static void gst_inter_video_src_get_property (GObject * object, guint property_id, GValue * value, GParamSpec * pspec); static void gst_inter_video_src_finalize (GObject * object); static gboolean gst_inter_video_src_set_caps (GstBaseSrc * src, GstCaps * caps); static gboolean gst_inter_video_src_start (GstBaseSrc * src); static gboolean gst_inter_video_src_stop (GstBaseSrc * src); static void gst_inter_video_src_get_times (GstBaseSrc * src, GstBuffer * buffer, GstClockTime * start, GstClockTime * end); static GstFlowReturn gst_inter_video_src_create (GstBaseSrc * src, guint64 offset, guint size, GstBuffer ** buf); static GstCaps *gst_inter_video_src_fixate (GstBaseSrc * src, GstCaps * caps); enum { PROP_0, PROP_CHANNEL }; /* pad templates */ static GstStaticPadTemplate gst_inter_video_src_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("I420")) ); /* class initialization */ G_DEFINE_TYPE (GstInterVideoSrc, gst_inter_video_src, GST_TYPE_BASE_SRC); static void gst_inter_video_src_class_init (GstInterVideoSrcClass * klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GstElementClass *element_class = GST_ELEMENT_CLASS (klass); GstBaseSrcClass *base_src_class = GST_BASE_SRC_CLASS (klass); GST_DEBUG_CATEGORY_INIT (gst_inter_video_src_debug_category, "intervideosrc", 0, "debug category for intervideosrc element"); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_inter_video_src_src_template)); gst_element_class_set_static_metadata (element_class, "Internal video source", "Source/Video", "Virtual video source for internal process communication", "David Schleef "); gobject_class->set_property = gst_inter_video_src_set_property; gobject_class->get_property = gst_inter_video_src_get_property; gobject_class->finalize = gst_inter_video_src_finalize; base_src_class->set_caps = GST_DEBUG_FUNCPTR (gst_inter_video_src_set_caps); base_src_class->start = GST_DEBUG_FUNCPTR (gst_inter_video_src_start); base_src_class->stop = GST_DEBUG_FUNCPTR (gst_inter_video_src_stop); base_src_class->get_times = GST_DEBUG_FUNCPTR (gst_inter_video_src_get_times); base_src_class->create = GST_DEBUG_FUNCPTR (gst_inter_video_src_create); base_src_class->fixate = GST_DEBUG_FUNCPTR (gst_inter_video_src_fixate); g_object_class_install_property (gobject_class, PROP_CHANNEL, g_param_spec_string ("channel", "Channel", "Channel name to match inter src and sink elements", "default", G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); } static void gst_inter_video_src_init (GstInterVideoSrc * intervideosrc) { gst_base_src_set_format (GST_BASE_SRC (intervideosrc), GST_FORMAT_TIME); gst_base_src_set_live (GST_BASE_SRC (intervideosrc), TRUE); intervideosrc->channel = g_strdup ("default"); } void gst_inter_video_src_set_property (GObject * object, guint property_id, const GValue * value, GParamSpec * pspec) { GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object); switch (property_id) { case PROP_CHANNEL: g_free (intervideosrc->channel); intervideosrc->channel = g_value_dup_string (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); break; } } void gst_inter_video_src_get_property (GObject * object, guint property_id, GValue * value, GParamSpec * pspec) { GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object); switch (property_id) { case PROP_CHANNEL: g_value_set_string (value, intervideosrc->channel); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); break; } } void gst_inter_video_src_finalize (GObject * object) { GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object); /* clean up object here */ g_free (intervideosrc->channel); G_OBJECT_CLASS (gst_inter_video_src_parent_class)->finalize (object); } static gboolean gst_inter_video_src_set_caps (GstBaseSrc * src, GstCaps * caps) { GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src); GST_DEBUG_OBJECT (intervideosrc, "set_caps"); if (!gst_video_info_from_caps (&intervideosrc->info, caps)) return FALSE; return gst_pad_set_caps (src->srcpad, caps); } static gboolean gst_inter_video_src_start (GstBaseSrc * src) { GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src); GST_DEBUG_OBJECT (intervideosrc, "start"); intervideosrc->surface = gst_inter_surface_get (intervideosrc->channel); return TRUE; } static gboolean gst_inter_video_src_stop (GstBaseSrc * src) { GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src); GST_DEBUG_OBJECT (intervideosrc, "stop"); gst_inter_surface_unref (intervideosrc->surface); intervideosrc->surface = NULL; return TRUE; } static void gst_inter_video_src_get_times (GstBaseSrc * src, GstBuffer * buffer, GstClockTime * start, GstClockTime * end) { GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src); GST_DEBUG_OBJECT (intervideosrc, "get_times"); /* for live sources, sync on the timestamp of the buffer */ if (gst_base_src_is_live (src)) { GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer); if (GST_CLOCK_TIME_IS_VALID (timestamp)) { /* get duration to calculate end time */ GstClockTime duration = GST_BUFFER_DURATION (buffer); if (GST_CLOCK_TIME_IS_VALID (duration)) { *end = timestamp + duration; } *start = timestamp; } } else { *start = -1; *end = -1; } } static GstFlowReturn gst_inter_video_src_create (GstBaseSrc * src, guint64 offset, guint size, GstBuffer ** buf) { GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src); GstBuffer *buffer; GST_DEBUG_OBJECT (intervideosrc, "create"); buffer = NULL; g_mutex_lock (&intervideosrc->surface->mutex); if (intervideosrc->surface->video_buffer) { buffer = gst_buffer_ref (intervideosrc->surface->video_buffer); intervideosrc->surface->video_buffer_count++; if (intervideosrc->surface->video_buffer_count >= 30) { gst_buffer_unref (intervideosrc->surface->video_buffer); intervideosrc->surface->video_buffer = NULL; } } g_mutex_unlock (&intervideosrc->surface->mutex); if (buffer == NULL) { GstMapInfo map; buffer = gst_buffer_new_and_alloc (GST_VIDEO_INFO_SIZE (&intervideosrc->info)); gst_buffer_map (buffer, &map, GST_MAP_WRITE); memset (map.data, 16, GST_VIDEO_INFO_COMP_STRIDE (&intervideosrc->info, 0) * GST_VIDEO_INFO_COMP_HEIGHT (&intervideosrc->info, 0)); memset (map.data + GST_VIDEO_INFO_COMP_OFFSET (&intervideosrc->info, 1), 128, 2 * GST_VIDEO_INFO_COMP_STRIDE (&intervideosrc->info, 1) * GST_VIDEO_INFO_COMP_HEIGHT (&intervideosrc->info, 1)); gst_buffer_unmap (buffer, &map); } buffer = gst_buffer_make_writable (buffer); GST_BUFFER_TIMESTAMP (buffer) = gst_util_uint64_scale_int (GST_SECOND * intervideosrc->n_frames, GST_VIDEO_INFO_FPS_D (&intervideosrc->info), GST_VIDEO_INFO_FPS_N (&intervideosrc->info)); GST_DEBUG_OBJECT (intervideosrc, "create ts %" GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer))); GST_BUFFER_DURATION (buffer) = gst_util_uint64_scale_int (GST_SECOND * (intervideosrc->n_frames + 1), GST_VIDEO_INFO_FPS_D (&intervideosrc->info), GST_VIDEO_INFO_FPS_N (&intervideosrc->info)) - GST_BUFFER_TIMESTAMP (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) { GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src); GstStructure *structure; GST_DEBUG_OBJECT (intervideosrc, "fixate"); caps = gst_caps_make_writable (caps); structure = gst_caps_get_structure (caps, 0); 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, "interlaced")) gst_structure_fixate_field_boolean (structure, "interlaced", FALSE); return caps; }