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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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377 lines
11 KiB
C
377 lines
11 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) <2006> Mark Nauwelaerts <mnauw@users.sourceforge.net>
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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-y4menc
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*
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* <refsect2>
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* <para>
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* Creates a YU4MPEG2 raw video stream as defined by the mjpegtools project.
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* </para>
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* <title>Example launch line</title>
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* <para>
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* (write everything in one line, without the backslash characters)
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* <programlisting>
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* gst-launch-0.10 videotestsrc num-buffers=250 \
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* ! 'video/x-raw-yuv,format=(fourcc)I420,width=320,height=240,framerate=(fraction)25/1' \
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* ! y4menc ! filesink location=test.yuv
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* </programlisting>
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* </para>
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* </refsect2>
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*
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*/
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/* see mjpegtools/yuv4mpeg.h for yuv4mpeg format */
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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 <string.h>
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include "gsty4mencode.h"
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/* Filter signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0
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};
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static GstStaticPadTemplate y4mencode_src_factory =
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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 ("application/x-yuv4mpeg, " "y4mversion = (int) 2")
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);
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static GstStaticPadTemplate y4mencode_sink_factory =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("{ IYUV, I420, Y42B, Y41B, Y444 }"))
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);
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static void gst_y4m_encode_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec);
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static void gst_y4m_encode_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec);
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static void gst_y4m_encode_reset (GstY4mEncode * filter);
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static gboolean gst_y4m_encode_setcaps (GstPad * pad, GstCaps * vscaps);
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static GstFlowReturn gst_y4m_encode_chain (GstPad * pad, GstBuffer * buf);
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static GstStateChangeReturn gst_y4m_encode_change_state (GstElement * element,
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GstStateChange transition);
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GST_BOILERPLATE (GstY4mEncode, gst_y4m_encode, GstElement, GST_TYPE_ELEMENT);
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static void
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gst_y4m_encode_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&y4mencode_src_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&y4mencode_sink_factory));
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gst_element_class_set_details_simple (element_class, "YUV4MPEG video encoder",
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"Codec/Encoder/Video",
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"Encodes a YUV frame into the yuv4mpeg format (mjpegtools)",
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"Wim Taymans <wim.taymans@gmail.com>");
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}
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static void
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gst_y4m_encode_class_init (GstY4mEncodeClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_y4m_encode_change_state);
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gobject_class->set_property = gst_y4m_encode_set_property;
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gobject_class->get_property = gst_y4m_encode_get_property;
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}
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static void
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gst_y4m_encode_init (GstY4mEncode * filter, GstY4mEncodeClass * klass)
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{
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filter->sinkpad =
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gst_pad_new_from_static_template (&y4mencode_sink_factory, "sink");
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gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
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gst_pad_set_chain_function (filter->sinkpad,
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GST_DEBUG_FUNCPTR (gst_y4m_encode_chain));
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gst_pad_set_setcaps_function (filter->sinkpad,
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GST_DEBUG_FUNCPTR (gst_y4m_encode_setcaps));
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filter->srcpad =
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gst_pad_new_from_static_template (&y4mencode_src_factory, "src");
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gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
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gst_pad_use_fixed_caps (filter->srcpad);
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/* init properties */
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gst_y4m_encode_reset (filter);
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}
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static void
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gst_y4m_encode_reset (GstY4mEncode * filter)
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{
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filter->width = filter->height = -1;
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filter->fps_num = filter->fps_den = 1;
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filter->par_num = filter->par_den = 1;
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filter->colorspace = "unknown";
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}
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static gboolean
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gst_y4m_encode_setcaps (GstPad * pad, GstCaps * vscaps)
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{
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GstY4mEncode *filter;
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GstStructure *structure;
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gboolean res;
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gint w, h;
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guint32 fourcc;
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const GValue *fps, *par, *interlaced;
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filter = GST_Y4M_ENCODE (GST_PAD_PARENT (pad));
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structure = gst_caps_get_structure (vscaps, 0);
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res = gst_structure_get_int (structure, "width", &w);
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res &= gst_structure_get_int (structure, "height", &h);
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res &= ((fps = gst_structure_get_value (structure, "framerate")) != NULL);
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res &= gst_structure_get_fourcc (structure, "format", &fourcc);
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switch (fourcc) { /* Translate fourcc to Y4M colorspace code */
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case GST_MAKE_FOURCC ('I', '4', '2', '0'):
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case GST_MAKE_FOURCC ('I', 'Y', 'U', 'V'):
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filter->colorspace = "420";
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break;
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case GST_MAKE_FOURCC ('Y', '4', '2', 'B'):
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filter->colorspace = "422";
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break;
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case GST_MAKE_FOURCC ('Y', '4', '1', 'B'):
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filter->colorspace = "411";
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break;
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case GST_MAKE_FOURCC ('Y', '4', '4', '4'):
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filter->colorspace = "444";
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break;
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default:
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res = FALSE;
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break;
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}
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if (!res || w <= 0 || h <= 0 || !GST_VALUE_HOLDS_FRACTION (fps))
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return FALSE;
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/* optional interlaced info */
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interlaced = gst_structure_get_value (structure, "interlaced");
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/* optional par info */
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par = gst_structure_get_value (structure, "pixel-aspect-ratio");
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filter->width = w;
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filter->height = h;
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filter->fps_num = gst_value_get_fraction_numerator (fps);
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filter->fps_den = gst_value_get_fraction_denominator (fps);
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if ((par != NULL) && GST_VALUE_HOLDS_FRACTION (par)) {
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filter->par_num = gst_value_get_fraction_numerator (par);
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filter->par_den = gst_value_get_fraction_denominator (par);
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} else { /* indicates unknown */
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filter->par_num = 0;
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filter->par_den = 0;
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}
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if ((interlaced != NULL) && G_VALUE_HOLDS (interlaced, G_TYPE_BOOLEAN)) {
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filter->interlaced = g_value_get_boolean (interlaced);
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} else {
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/* assume progressive if no interlaced property in caps */
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filter->interlaced = FALSE;
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}
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/* the template caps will do for the src pad, should always accept */
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return gst_pad_set_caps (filter->srcpad,
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gst_static_pad_template_get_caps (&y4mencode_src_factory));
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}
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static inline GstBuffer *
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gst_y4m_encode_get_stream_header (GstY4mEncode * filter)
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{
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gpointer header;
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GstBuffer *buf;
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gchar interlaced;
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interlaced = 'p';
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if (filter->interlaced && filter->top_field_first)
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interlaced = 't';
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else if (filter->interlaced)
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interlaced = 'b';
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header = g_strdup_printf ("YUV4MPEG2 C%s W%d H%d I%c F%d:%d A%d:%d\n",
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filter->colorspace, filter->width, filter->height, interlaced,
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filter->fps_num, filter->fps_den, filter->par_num, filter->par_den);
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buf = gst_buffer_new ();
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gst_buffer_set_data (buf, header, strlen (header));
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/* so it gets free'd when needed */
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GST_BUFFER_MALLOCDATA (buf) = header;
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return buf;
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}
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static inline GstBuffer *
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gst_y4m_encode_get_frame_header (GstY4mEncode * filter)
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{
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gpointer header;
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GstBuffer *buf;
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header = g_strdup_printf ("FRAME\n");
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buf = gst_buffer_new ();
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gst_buffer_set_data (buf, header, strlen (header));
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/* so it gets free'd when needed */
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GST_BUFFER_MALLOCDATA (buf) = header;
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return buf;
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}
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static GstFlowReturn
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gst_y4m_encode_chain (GstPad * pad, GstBuffer * buf)
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{
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GstY4mEncode *filter = GST_Y4M_ENCODE (GST_PAD_PARENT (pad));
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GstBuffer *outbuf;
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GstClockTime timestamp;
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/* check we got some decent info from caps */
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if (filter->width < 0) {
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GST_ELEMENT_ERROR ("filter", CORE, NEGOTIATION, (NULL),
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("format wasn't negotiated before chain function"));
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gst_buffer_unref (buf);
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return GST_FLOW_NOT_NEGOTIATED;
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}
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timestamp = GST_BUFFER_TIMESTAMP (buf);
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if (G_UNLIKELY (!filter->header)) {
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if (filter->interlaced == TRUE) {
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if (GST_BUFFER_FLAG_IS_SET (buf, GST_VIDEO_BUFFER_TFF)) {
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filter->top_field_first = TRUE;
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} else {
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filter->top_field_first = FALSE;
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}
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}
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outbuf = gst_y4m_encode_get_stream_header (filter);
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filter->header = TRUE;
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outbuf = gst_buffer_join (outbuf, gst_y4m_encode_get_frame_header (filter));
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} else {
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outbuf = gst_y4m_encode_get_frame_header (filter);
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}
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/* join with data */
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outbuf = gst_buffer_join (outbuf, buf);
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/* decorate */
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gst_buffer_make_metadata_writable (outbuf);
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gst_buffer_set_caps (outbuf, GST_PAD_CAPS (filter->srcpad));
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GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
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return gst_pad_push (filter->srcpad, outbuf);
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}
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static void
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gst_y4m_encode_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstY4mEncode *filter;
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g_return_if_fail (GST_IS_Y4M_ENCODE (object));
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filter = GST_Y4M_ENCODE (object);
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switch (prop_id) {
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default:
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break;
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}
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}
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static void
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gst_y4m_encode_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstY4mEncode *filter;
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g_return_if_fail (GST_IS_Y4M_ENCODE (object));
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filter = GST_Y4M_ENCODE (object);
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switch (prop_id) {
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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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static GstStateChangeReturn
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gst_y4m_encode_change_state (GstElement * element, GstStateChange transition)
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{
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GstY4mEncode *filter = GST_Y4M_ENCODE (element);
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GstStateChangeReturn ret;
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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break;
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default:
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break;
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}
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ret = GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS, change_state,
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(element, transition), GST_STATE_CHANGE_SUCCESS);
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if (ret != GST_STATE_CHANGE_SUCCESS)
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return ret;
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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gst_y4m_encode_reset (filter);
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break;
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default:
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break;
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}
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return GST_STATE_CHANGE_SUCCESS;
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}
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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "y4menc", GST_RANK_PRIMARY,
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GST_TYPE_Y4M_ENCODE);
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"y4menc",
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"Encodes a YUV frame into the yuv4mpeg format (mjpegtools)",
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plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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