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