gstreamer/gst/y4m/gsty4mencode.c
2012-11-04 00:07:18 +00:00

382 lines
10 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2006> Mark Nauwelaerts <mnauw@users.sourceforge.net>
*
* 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 St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-y4menc
*
* <refsect2>
* <para>
* Creates a YU4MPEG2 raw video stream as defined by the mjpegtools project.
* </para>
* <title>Example launch line</title>
* <para>
* (write everything in one line, without the backslash characters)
* <programlisting>
* gst-launch-0.10 videotestsrc num-buffers=250 \
* ! 'video/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)25/1' \
* ! y4menc ! filesink location=test.yuv
* </programlisting>
* </para>
* </refsect2>
*
*/
/* see mjpegtools/yuv4mpeg.h for yuv4mpeg format */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include <gst/video/video.h>
#include "gsty4mencode.h"
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
};
static GstStaticPadTemplate y4mencode_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-yuv4mpeg, " "y4mversion = (int) 2")
);
static GstStaticPadTemplate y4mencode_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ IYUV, I420, Y42B, Y41B, Y444 }"))
);
static void gst_y4m_encode_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_y4m_encode_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static void gst_y4m_encode_reset (GstY4mEncode * filter);
static gboolean gst_y4m_encode_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstFlowReturn gst_y4m_encode_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static GstStateChangeReturn gst_y4m_encode_change_state (GstElement * element,
GstStateChange transition);
#define gst_y4m_encode_parent_class parent_class
G_DEFINE_TYPE (GstY4mEncode, gst_y4m_encode, GST_TYPE_ELEMENT);
static void
gst_y4m_encode_class_init (GstY4mEncodeClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->set_property = gst_y4m_encode_set_property;
gobject_class->get_property = gst_y4m_encode_get_property;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_y4m_encode_change_state);
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&y4mencode_src_factory));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&y4mencode_sink_factory));
gst_element_class_set_static_metadata (gstelement_class,
"YUV4MPEG video encoder", "Codec/Encoder/Video",
"Encodes a YUV frame into the yuv4mpeg format (mjpegtools)",
"Wim Taymans <wim.taymans@gmail.com>");
}
static void
gst_y4m_encode_init (GstY4mEncode * filter)
{
filter->sinkpad =
gst_pad_new_from_static_template (&y4mencode_sink_factory, "sink");
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
gst_pad_set_chain_function (filter->sinkpad,
GST_DEBUG_FUNCPTR (gst_y4m_encode_chain));
gst_pad_set_event_function (filter->sinkpad,
GST_DEBUG_FUNCPTR (gst_y4m_encode_sink_event));
filter->srcpad =
gst_pad_new_from_static_template (&y4mencode_src_factory, "src");
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
gst_pad_use_fixed_caps (filter->srcpad);
/* init properties */
gst_y4m_encode_reset (filter);
}
static void
gst_y4m_encode_reset (GstY4mEncode * filter)
{
filter->negotiated = FALSE;
}
static gboolean
gst_y4m_encode_setcaps (GstPad * pad, GstCaps * vscaps)
{
gboolean ret;
GstY4mEncode *filter;
GstVideoInfo info;
filter = GST_Y4M_ENCODE (GST_PAD_PARENT (pad));
if (!gst_video_info_from_caps (&info, vscaps))
goto invalid_format;
switch (GST_VIDEO_INFO_FORMAT (&info)) {
case GST_VIDEO_FORMAT_I420:
filter->colorspace = "420";
break;
case GST_VIDEO_FORMAT_Y42B:
filter->colorspace = "422";
break;
case GST_VIDEO_FORMAT_Y41B:
filter->colorspace = "411";
break;
case GST_VIDEO_FORMAT_Y444:
filter->colorspace = "444";
break;
default:
goto invalid_format;
}
filter->info = info;
/* the template caps will do for the src pad, should always accept */
ret = gst_pad_set_caps (filter->srcpad,
gst_static_pad_template_get_caps (&y4mencode_src_factory));
filter->negotiated = ret;
return ret;
/* ERRORS */
invalid_format:
{
GST_ERROR_OBJECT (filter, "got invalid caps");
return FALSE;
}
}
static gboolean
gst_y4m_encode_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean res;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
res = gst_y4m_encode_setcaps (pad, caps);
gst_event_unref (event);
break;
}
default:
res = gst_pad_event_default (pad, parent, event);
break;
}
return res;
}
static inline GstBuffer *
gst_y4m_encode_get_stream_header (GstY4mEncode * filter, gboolean tff)
{
gpointer header;
GstBuffer *buf;
gchar interlaced;
gsize len;
if (GST_VIDEO_INFO_IS_INTERLACED (&filter->info)) {
if (tff)
interlaced = 't';
else
interlaced = 'b';
} else {
interlaced = 'p';
}
header = g_strdup_printf ("YUV4MPEG2 C%s W%d H%d I%c F%d:%d A%d:%d\n",
filter->colorspace, GST_VIDEO_INFO_WIDTH (&filter->info),
GST_VIDEO_INFO_HEIGHT (&filter->info), interlaced,
GST_VIDEO_INFO_FPS_N (&filter->info),
GST_VIDEO_INFO_FPS_D (&filter->info),
GST_VIDEO_INFO_PAR_N (&filter->info),
GST_VIDEO_INFO_PAR_D (&filter->info));
len = strlen (header);
buf = gst_buffer_new ();
gst_buffer_append_memory (buf,
gst_memory_new_wrapped (0, header, len, 0, len, header, g_free));
return buf;
}
static inline GstBuffer *
gst_y4m_encode_get_frame_header (GstY4mEncode * filter)
{
gpointer header;
GstBuffer *buf;
gsize len;
header = g_strdup_printf ("FRAME\n");
len = strlen (header);
buf = gst_buffer_new ();
gst_buffer_append_memory (buf,
gst_memory_new_wrapped (0, header, len, 0, len, header, g_free));
return buf;
}
static GstFlowReturn
gst_y4m_encode_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstY4mEncode *filter = GST_Y4M_ENCODE (parent);
GstBuffer *outbuf;
GstClockTime timestamp;
/* check we got some decent info from caps */
if (GST_VIDEO_INFO_FORMAT (&filter->info) == GST_VIDEO_FORMAT_UNKNOWN)
goto not_negotiated;
timestamp = GST_BUFFER_TIMESTAMP (buf);
if (G_UNLIKELY (!filter->header)) {
gboolean tff;
if (GST_VIDEO_INFO_IS_INTERLACED (&filter->info)) {
tff = GST_BUFFER_FLAG_IS_SET (buf, GST_VIDEO_BUFFER_FLAG_TFF);
}
outbuf = gst_y4m_encode_get_stream_header (filter, tff);
filter->header = TRUE;
outbuf =
gst_buffer_append (outbuf, gst_y4m_encode_get_frame_header (filter));
} else {
outbuf = gst_y4m_encode_get_frame_header (filter);
}
/* join with data, FIXME, strides are all wrong etc */
outbuf = gst_buffer_append (outbuf, buf);
/* decorate */
outbuf = gst_buffer_make_writable (outbuf);
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
return gst_pad_push (filter->srcpad, outbuf);
/* ERRORS */
not_negotiated:
{
GST_ELEMENT_ERROR (filter, CORE, NEGOTIATION, (NULL),
("format wasn't negotiated before chain function"));
gst_buffer_unref (buf);
return GST_FLOW_NOT_NEGOTIATED;
}
}
static void
gst_y4m_encode_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstY4mEncode G_GNUC_UNUSED *filter;
g_return_if_fail (GST_IS_Y4M_ENCODE (object));
filter = GST_Y4M_ENCODE (object);
switch (prop_id) {
default:
break;
}
}
static void
gst_y4m_encode_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstY4mEncode G_GNUC_UNUSED *filter;
g_return_if_fail (GST_IS_Y4M_ENCODE (object));
filter = GST_Y4M_ENCODE (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_y4m_encode_change_state (GstElement * element, GstStateChange transition)
{
GstY4mEncode *filter = GST_Y4M_ENCODE (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
default:
break;
}
ret = GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS, change_state,
(element, transition), GST_STATE_CHANGE_SUCCESS);
if (ret != GST_STATE_CHANGE_SUCCESS)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_y4m_encode_reset (filter);
break;
default:
break;
}
return GST_STATE_CHANGE_SUCCESS;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "y4menc", GST_RANK_PRIMARY,
GST_TYPE_Y4M_ENCODE);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
y4menc,
"Encodes a YUV frame into the yuv4mpeg format (mjpegtools)",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)