gstreamer/gst/pnm/gstpnmenc.c
2012-11-04 00:09:59 +00:00

275 lines
7.8 KiB
C

/* GStreamer PNM encoder
* Copyright (C) 2009 Lutz Mueller <lutz@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-pnmenc
*
* Encodes pnm images. This plugin supports both raw and ASCII encoding.
* To enable ASCII encoding, set the parameter ascii to TRUE. If you omit
* the parameter or set it to FALSE, the output will be raw encoded.
*
* <refsect>
* <title>Example launch line</title>
* |[
* gst-launch videotestsrc num_buffers=1 ! videoconvert ! "video/x-raw,format=GRAY8" ! pnmenc ascii=true ! filesink location=test.pnm
* ]| The above pipeline writes a test pnm file (ASCII encoding).
* </refsect2>
*/
/*
* FIXME: Port to GstVideoEncoder
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstpnmenc.h"
#include "gstpnmutils.h"
#include <gst/gstutils.h>
#include <gst/video/video.h>
#include <string.h>
enum
{
GST_PNMENC_PROP_0,
GST_PNMENC_PROP_ASCII
/* Add here. */
};
static GstStaticPadTemplate sink_pad_template =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("RGB") "; "
GST_VIDEO_CAPS_MAKE ("GRAY8")));
static GstStaticPadTemplate src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS (MIME_ALL));
G_DEFINE_TYPE (GstPnmenc, gst_pnmenc, GST_TYPE_ELEMENT);
static void
gst_pnmenc_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstPnmenc *s = GST_PNMENC (object);
switch (prop_id) {
case GST_PNMENC_PROP_ASCII:
if (g_value_get_boolean (value))
s->info.encoding = GST_PNM_ENCODING_ASCII;
else
s->info.encoding = GST_PNM_ENCODING_RAW;
s->info.fields |= GST_PNM_INFO_FIELDS_ENCODING;
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_pnmenc_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstPnmenc *s = GST_PNMENC (object);
switch (prop_id) {
case GST_PNMENC_PROP_ASCII:
g_value_set_boolean (value, s->info.encoding == GST_PNM_ENCODING_ASCII);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstFlowReturn
gst_pnmenc_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstPnmenc *s = GST_PNMENC (parent);
GstFlowReturn r;
gchar *header;
GstBuffer *out;
/* Assumption: One buffer, one image. That is, always first write header. */
header = g_strdup_printf ("P%i\n%i %i\n%i\n",
s->info.type + 3 * (1 - s->info.encoding), s->info.width, s->info.height,
s->info.max);
out = gst_buffer_new_wrapped (header, strlen (header));
if ((r = gst_pad_push (s->src, out)) != GST_FLOW_OK)
goto out;
/* Need to convert from GStreamer rowstride to PNM rowstride */
if (s->info.width % 4 != 0) {
guint i_rowstride;
guint o_rowstride;
GstBuffer *obuf;
guint i;
GstMapInfo imap, omap;
if (s->info.type == GST_PNM_TYPE_PIXMAP) {
o_rowstride = 3 * s->info.width;
i_rowstride = GST_ROUND_UP_4 (o_rowstride);
} else {
o_rowstride = s->info.width;
i_rowstride = GST_ROUND_UP_4 (o_rowstride);
}
obuf = gst_buffer_new_and_alloc (o_rowstride * s->info.height);
gst_buffer_map (obuf, &omap, GST_MAP_WRITE);
gst_buffer_map (buf, &imap, GST_MAP_READ);
for (i = 0; i < s->info.height; i++)
memcpy (omap.data + o_rowstride * i, imap.data + i_rowstride * i,
o_rowstride);
gst_buffer_unmap (buf, &imap);
gst_buffer_unmap (obuf, &omap);
gst_buffer_unref (buf);
buf = obuf;
} else {
/* Pass through the data. */
buf = gst_buffer_make_writable (buf);
}
/* We might need to convert to ASCII... */
if (s->info.encoding == GST_PNM_ENCODING_ASCII) {
GstBuffer *obuf;
guint i, o;
GstMapInfo imap, omap;
gst_buffer_map (buf, &imap, GST_MAP_READ);
obuf = gst_buffer_new_and_alloc (imap.size * (4 + 1 / 20.));
gst_buffer_map (obuf, &omap, GST_MAP_WRITE);
for (i = o = 0; i < imap.size; i++) {
g_snprintf ((char *) omap.data + o, 4, "%3i", imap.data[i]);
o += 3;
omap.data[o++] = ' ';
if (!((i + 1) % 20))
omap.data[o++] = '\n';
}
gst_buffer_unmap (buf, &imap);
gst_buffer_unmap (obuf, &omap);
gst_buffer_unref (buf);
buf = obuf;
}
r = gst_pad_push (s->src, buf);
out:
return r;
}
static gboolean
gst_pnmenc_setcaps (GstPnmenc * s, GstCaps * caps)
{
gboolean r;
GstCaps *srccaps;
s->info.max = 255;
s->info.fields = GST_PNM_INFO_FIELDS_MAX;
if (!gst_video_info_from_caps (&s->vinfo, caps))
return FALSE;
if (GST_VIDEO_INFO_IS_RGB (&s->vinfo)) {
s->info.type = GST_PNM_TYPE_PIXMAP;
srccaps = gst_caps_from_string (MIME_PM);
} else if (GST_VIDEO_INFO_IS_GRAY (&s->vinfo)) {
s->info.type = GST_PNM_TYPE_GRAYMAP;
srccaps = gst_caps_from_string (MIME_GM);
} else {
return FALSE;
}
r = gst_pad_set_caps (s->src, srccaps);
gst_caps_unref (srccaps);
s->info.fields |= GST_PNM_INFO_FIELDS_TYPE;
/* Remember width and height of the input data. */
s->info.width = GST_VIDEO_INFO_WIDTH (&s->vinfo);
s->info.height = GST_VIDEO_INFO_HEIGHT (&s->vinfo);
s->info.fields |= GST_PNM_INFO_FIELDS_WIDTH | GST_PNM_INFO_FIELDS_HEIGHT;
return r;
}
static gboolean
gst_pnmenc_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstPnmenc *s = GST_PNMENC (parent);
gboolean r = FALSE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
r = gst_pnmenc_setcaps (s, caps);
gst_event_unref (event);
break;
}
default:
r = gst_pad_event_default (pad, parent, event);
break;
}
return r;
}
static void
gst_pnmenc_init (GstPnmenc * s)
{
GstPad *pad;
pad = gst_pad_new_from_static_template (&sink_pad_template, "sink");
gst_pad_set_chain_function (pad, gst_pnmenc_chain);
gst_pad_set_event_function (pad, gst_pnmenc_sink_event);
gst_pad_use_fixed_caps (pad);
gst_element_add_pad (GST_ELEMENT (s), pad);
s->src = gst_pad_new_from_static_template (&src_pad_template, "src");
gst_element_add_pad (GST_ELEMENT (s), s->src);
}
static void
gst_pnmenc_class_init (GstPnmencClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_pad_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_pad_template));
gst_element_class_set_static_metadata (element_class, "PNM image encoder",
"Codec/Encoder/Image",
"Encodes images into portable pixmap or graymap (PNM) format",
"Lutz Mueller <lutz@users.sourceforge.net>");
gobject_class->set_property = gst_pnmenc_set_property;
gobject_class->get_property = gst_pnmenc_get_property;
g_object_class_install_property (gobject_class, GST_PNMENC_PROP_ASCII,
g_param_spec_boolean ("ascii", "ASCII Encoding", "The output will be "
"ASCII encoded", FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}