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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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341 lines
8.9 KiB
C
341 lines
8.9 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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, 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,format=(string)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_MAKE ("{ IYUV, I420, Y42B, Y41B, Y444 }"))
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);
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static void gst_y4m_encode_reset (GstY4mEncode * filter);
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static gboolean gst_y4m_encode_sink_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static GstFlowReturn gst_y4m_encode_chain (GstPad * pad, GstObject * parent,
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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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#define gst_y4m_encode_parent_class parent_class
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G_DEFINE_TYPE (GstY4mEncode, gst_y4m_encode, GST_TYPE_ELEMENT);
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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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GstElementClass *gstelement_class;
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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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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&y4mencode_src_factory));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&y4mencode_sink_factory));
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gst_element_class_set_static_metadata (gstelement_class,
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"YUV4MPEG video encoder", "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_init (GstY4mEncode * filter)
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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_event_function (filter->sinkpad,
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GST_DEBUG_FUNCPTR (gst_y4m_encode_sink_event));
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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->negotiated = FALSE;
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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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gboolean ret;
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GstY4mEncode *filter;
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GstVideoInfo info;
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filter = GST_Y4M_ENCODE (GST_PAD_PARENT (pad));
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if (!gst_video_info_from_caps (&info, vscaps))
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goto invalid_format;
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switch (GST_VIDEO_INFO_FORMAT (&info)) {
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case GST_VIDEO_FORMAT_I420:
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filter->colorspace = "420";
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break;
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case GST_VIDEO_FORMAT_Y42B:
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filter->colorspace = "422";
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break;
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case GST_VIDEO_FORMAT_Y41B:
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filter->colorspace = "411";
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break;
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case GST_VIDEO_FORMAT_Y444:
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filter->colorspace = "444";
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break;
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default:
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goto invalid_format;
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}
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filter->info = info;
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/* the template caps will do for the src pad, should always accept */
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ret = gst_pad_set_caps (filter->srcpad,
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gst_static_pad_template_get_caps (&y4mencode_src_factory));
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filter->negotiated = ret;
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return ret;
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/* ERRORS */
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invalid_format:
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{
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GST_ERROR_OBJECT (filter, "got invalid caps");
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return FALSE;
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}
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}
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static gboolean
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gst_y4m_encode_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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gboolean res;
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_CAPS:
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{
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GstCaps *caps;
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gst_event_parse_caps (event, &caps);
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res = gst_y4m_encode_setcaps (pad, caps);
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gst_event_unref (event);
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break;
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}
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default:
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res = gst_pad_event_default (pad, parent, event);
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break;
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}
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return res;
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}
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static inline GstBuffer *
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gst_y4m_encode_get_stream_header (GstY4mEncode * filter, gboolean tff)
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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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gsize len;
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if (GST_VIDEO_INFO_IS_INTERLACED (&filter->info)) {
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if (tff)
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interlaced = 't';
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else
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interlaced = 'b';
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} else {
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interlaced = 'p';
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}
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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, GST_VIDEO_INFO_WIDTH (&filter->info),
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GST_VIDEO_INFO_HEIGHT (&filter->info), interlaced,
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GST_VIDEO_INFO_FPS_N (&filter->info),
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GST_VIDEO_INFO_FPS_D (&filter->info),
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GST_VIDEO_INFO_PAR_N (&filter->info),
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GST_VIDEO_INFO_PAR_D (&filter->info));
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len = strlen (header);
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buf = gst_buffer_new ();
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gst_buffer_append_memory (buf,
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gst_memory_new_wrapped (0, header, len, 0, len, header, g_free));
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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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gsize len;
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header = g_strdup_printf ("FRAME\n");
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len = strlen (header);
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buf = gst_buffer_new ();
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gst_buffer_append_memory (buf,
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gst_memory_new_wrapped (0, header, len, 0, len, header, g_free));
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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, GstObject * parent, GstBuffer * buf)
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{
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GstY4mEncode *filter = GST_Y4M_ENCODE (parent);
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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 (GST_VIDEO_INFO_FORMAT (&filter->info) == GST_VIDEO_FORMAT_UNKNOWN)
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goto not_negotiated;
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timestamp = GST_BUFFER_TIMESTAMP (buf);
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if (G_UNLIKELY (!filter->header)) {
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gboolean tff = FALSE;
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if (GST_VIDEO_INFO_IS_INTERLACED (&filter->info)) {
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tff = GST_BUFFER_FLAG_IS_SET (buf, GST_VIDEO_BUFFER_FLAG_TFF);
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}
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outbuf = gst_y4m_encode_get_stream_header (filter, tff);
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filter->header = TRUE;
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outbuf =
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gst_buffer_append (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, FIXME, strides are all wrong etc */
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outbuf = gst_buffer_append (outbuf, buf);
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/* decorate */
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outbuf = gst_buffer_make_writable (outbuf);
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GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
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return gst_pad_push (filter->srcpad, outbuf);
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/* ERRORS */
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not_negotiated:
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{
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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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}
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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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