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We can't easily know which caps will can be used because we rely on libgstvideo's support for video formats.
259 lines
8 KiB
C
259 lines
8 KiB
C
/* GStreamer
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* Copyright (C) 2006 David A. Schleef <ds@schleef.org>
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* Copyright (C) 2007,2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
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*
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* gstvideoparse.c:
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-videoparse
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*
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* Converts a byte stream into video frames.
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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 "gstvideoparse.h"
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static void gst_video_parse_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_video_parse_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstCaps *gst_video_parse_get_caps (GstRawParse * rp);
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static void gst_video_parse_set_buffer_flags (GstRawParse * rp,
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GstBuffer * buffer);
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static void gst_video_parse_update_frame_size (GstVideoParse * vp);
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GST_DEBUG_CATEGORY_STATIC (gst_video_parse_debug);
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#define GST_CAT_DEFAULT gst_video_parse_debug
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enum
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{
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PROP_0,
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PROP_FORMAT,
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PROP_WIDTH,
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PROP_HEIGHT,
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PROP_PAR,
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PROP_FRAMERATE,
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PROP_INTERLACED,
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PROP_TOP_FIELD_FIRST
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};
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GST_BOILERPLATE (GstVideoParse, gst_video_parse, GstRawParse,
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GST_TYPE_RAW_PARSE);
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static void
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gst_video_parse_base_init (gpointer g_class)
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{
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GstRawParseClass *rp_class = GST_RAW_PARSE_CLASS (g_class);
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
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GstCaps *caps;
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GST_DEBUG_CATEGORY_INIT (gst_video_parse_debug, "videoparse", 0,
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"videoparse element");
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gst_element_class_set_details_simple (gstelement_class, "Video Parse",
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"Filter/Video",
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"Converts stream into video frames",
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"David Schleef <ds@schleef.org>, "
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"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
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caps =
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gst_caps_from_string
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("video/x-raw-rgb; video/x-raw-yuv; video/x-raw-gray; video/x-raw-bayer");
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gst_raw_parse_class_set_src_pad_template (rp_class, caps);
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gst_raw_parse_class_set_multiple_frames_per_buffer (rp_class, FALSE);
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gst_caps_unref (caps);
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}
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static void
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gst_video_parse_class_init (GstVideoParseClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstRawParseClass *rp_class = GST_RAW_PARSE_CLASS (klass);
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gobject_class->set_property = gst_video_parse_set_property;
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gobject_class->get_property = gst_video_parse_get_property;
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rp_class->get_caps = gst_video_parse_get_caps;
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rp_class->set_buffer_flags = gst_video_parse_set_buffer_flags;
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g_object_class_install_property (gobject_class, PROP_FORMAT,
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g_param_spec_enum ("format", "Format", "Format of images in raw stream",
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GST_TYPE_VIDEO_FORMAT, GST_VIDEO_FORMAT_I420,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_WIDTH,
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g_param_spec_int ("width", "Width", "Width of images in raw stream",
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0, INT_MAX, 320, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_HEIGHT,
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g_param_spec_int ("height", "Height", "Height of images in raw stream",
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0, INT_MAX, 240, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_FRAMERATE,
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gst_param_spec_fraction ("framerate", "Frame Rate",
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"Frame rate of images in raw stream", 0, 1, 100, 1, 25, 1,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_PAR,
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gst_param_spec_fraction ("pixel-aspect-ratio", "Pixel Aspect Ratio",
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"Pixel aspect ratio of images in raw stream", 1, 100, 100, 1, 1, 1,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_INTERLACED,
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g_param_spec_boolean ("interlaced", "Interlaced flag",
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"True if video is interlaced", FALSE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_TOP_FIELD_FIRST,
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g_param_spec_boolean ("top-field-first", "Top field first",
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"True if top field is earlier than bottom field", TRUE,
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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_video_parse_init (GstVideoParse * vp, GstVideoParseClass * g_class)
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{
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vp->width = 320;
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vp->height = 240;
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vp->format = GST_VIDEO_FORMAT_I420;
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vp->par_n = 1;
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vp->par_d = 1;
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gst_video_parse_update_frame_size (vp);
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gst_raw_parse_set_fps (GST_RAW_PARSE (vp), 25, 1);
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}
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static void
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gst_video_parse_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstVideoParse *vp = GST_VIDEO_PARSE (object);
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g_return_if_fail (!gst_raw_parse_is_negotiated (GST_RAW_PARSE (vp)));
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switch (prop_id) {
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case PROP_FORMAT:
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vp->format = g_value_get_enum (value);
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break;
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case PROP_WIDTH:
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vp->width = g_value_get_int (value);
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break;
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case PROP_HEIGHT:
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vp->height = g_value_get_int (value);
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break;
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case PROP_FRAMERATE:
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gst_raw_parse_set_fps (GST_RAW_PARSE (vp),
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gst_value_get_fraction_numerator (value),
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gst_value_get_fraction_denominator (value));
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break;
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case PROP_PAR:
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vp->par_n = gst_value_get_fraction_numerator (value);
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vp->par_d = gst_value_get_fraction_denominator (value);
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break;
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case PROP_INTERLACED:
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vp->interlaced = g_value_get_boolean (value);
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break;
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case PROP_TOP_FIELD_FIRST:
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vp->top_field_first = g_value_get_boolean (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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gst_video_parse_update_frame_size (vp);
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}
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static void
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gst_video_parse_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstVideoParse *vp = GST_VIDEO_PARSE (object);
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switch (prop_id) {
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case PROP_FORMAT:
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g_value_set_enum (value, vp->format);
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break;
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case PROP_WIDTH:
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g_value_set_int (value, vp->width);
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break;
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case PROP_HEIGHT:
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g_value_set_int (value, vp->height);
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break;
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case PROP_FRAMERATE:{
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gint fps_n, fps_d;
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gst_raw_parse_get_fps (GST_RAW_PARSE (vp), &fps_n, &fps_d);
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gst_value_set_fraction (value, fps_n, fps_d);
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break;
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}
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case PROP_PAR:
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gst_value_set_fraction (value, vp->par_n, vp->par_d);
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break;
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case PROP_INTERLACED:
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g_value_set_boolean (value, vp->interlaced);
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break;
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case PROP_TOP_FIELD_FIRST:
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g_value_set_boolean (value, vp->top_field_first);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_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_video_parse_update_frame_size (GstVideoParse * vp)
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{
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gint framesize;
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framesize = gst_video_format_get_size (vp->format, vp->width, vp->height);
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gst_raw_parse_set_framesize (GST_RAW_PARSE (vp), framesize);
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}
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static GstCaps *
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gst_video_parse_get_caps (GstRawParse * rp)
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{
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GstVideoParse *vp = GST_VIDEO_PARSE (rp);
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GstCaps *caps;
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gint fps_n, fps_d;
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gst_raw_parse_get_fps (rp, &fps_n, &fps_d);
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caps =
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gst_video_format_new_caps_interlaced (vp->format, vp->width, vp->height,
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fps_n, fps_d, vp->par_n, vp->par_d, vp->interlaced);
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return caps;
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}
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static void
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gst_video_parse_set_buffer_flags (GstRawParse * rp, GstBuffer * buffer)
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{
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GstVideoParse *vp = GST_VIDEO_PARSE (rp);
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if (vp->interlaced) {
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if (vp->top_field_first) {
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GST_BUFFER_FLAG_SET (buffer, GST_VIDEO_BUFFER_TFF);
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} else {
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GST_BUFFER_FLAG_UNSET (buffer, GST_VIDEO_BUFFER_TFF);
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}
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}
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}
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