pnm: Add PNM encoder and decoder elements

Fixes bug #164870.

1 files changed, 170 insertions, 0 deletions

diff --git a/gst/pnm/gstpnmenc.c b/gst/pnm/gstpnmenc.c
new file mode 100644
index 000000000..56348bd53
--- /dev/null
+++ b/gst/pnm/gstpnmenc.c
@@ -0,0 +1,170 @@
+/* GStreamer
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:element-pnmenc
+ *
+ * Encodes pnm images.
+ *
+ * <refsect">
+ * <title>Example launch line</title>
+ * |[
+ * gst-launch videotestsrc num_buffers=1 ! pnmenc ! filesink location=test.pnm
+ * ]| The above pipeline writes a test pnm file.
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstpnmenc.h"
+#include "gstpnmutils.h"
+
+#include <gst/gstutils.h>
+
+#include <string.h>
+
+static GstElementDetails pnmenc_details =
+GST_ELEMENT_DETAILS ("PNM converter", "Codec/Encoder/Image",
+    "Encodes in PNM format",
+    "Lutz Mueller <lutz@users.sourceforge.net>");
+
+static GstStaticPadTemplate sink_pad_template =
+GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("video/x-raw-rgb, bpp = (int) 24, "
+        "width = (int) [ 1, MAX ], height = (int) [ 1, MAX ]"));
+
+static GstStaticPadTemplate src_pad_template =
+GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
+    GST_STATIC_CAPS (MIME_ALL));
+
+static GstFlowReturn
+gst_pnmenc_chain (GstPad * pad, GstBuffer * buf)
+{
+  GstPnmenc *s = GST_PNMENC (gst_pad_get_parent (pad));
+  GstPad *src = gst_element_get_static_pad (GST_ELEMENT (s), "src");
+  GstFlowReturn r;
+  gchar *header;
+  GstBuffer *out;
+
+  /* The caps on the source may not be set. */
+  if (!GST_PAD_CAPS (src)) {
+    GstCaps *caps = gst_caps_new_simple (MIME_PM, NULL);
+    gst_pad_set_caps (src, caps);
+    gst_caps_unref (caps);
+  }
+
+  /* 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, s->info.width, s->info.height, s->info.max);
+  out = gst_buffer_new ();
+  gst_buffer_set_data (out, (guchar *) header, strlen (header));
+  gst_buffer_set_caps (out, GST_PAD_CAPS (src));
+  if ((r = gst_pad_push (src, buf)) != GST_FLOW_OK)
+    return r;
+
+  /* Pass through the data. */
+  gst_buffer_set_caps (buf, GST_PAD_CAPS (src));
+  return gst_pad_push (src, buf);
+}
+
+static gboolean
+gst_pnmenc_setcaps_func_sink (GstPad * pad, GstCaps * caps)
+{
+  GstPnmenc *s = GST_PNMENC (gst_pad_get_parent (pad));
+  GstStructure *structure = gst_caps_get_structure (caps, 0);
+
+  if (!gst_structure_get_int (structure, "width", (int *) &s->info.width) ||
+      !gst_structure_get_int (structure, "height", (int *) &s->info.height))
+    return FALSE;
+  s->info.fields = GST_PNM_INFO_FIELDS_WIDTH | GST_PNM_INFO_FIELDS_HEIGHT;
+
+  return TRUE;
+}
+
+static GstPadLinkReturn
+gst_pnmenc_setcaps_func_src (GstPad * pad, GstCaps * caps)
+{
+  GstPnmenc *s = GST_PNMENC (gst_pad_get_parent (pad));
+  guint i;
+
+  s->info.fields &= ~GST_PNM_INFO_FIELDS_TYPE;
+  for (i = 0; i < gst_caps_get_size (caps); i++) {
+    GstStructure *structure = gst_caps_get_structure (caps, i);
+    const gchar *mime = gst_structure_get_name (structure);
+
+    if (!strcmp (mime, MIME_BM)) {
+      s->info.type = GST_PNM_TYPE_BITMAP_RAW;
+      break;
+    }
+    if (!strcmp (mime, MIME_GM)) {
+      s->info.type = GST_PNM_TYPE_GRAYMAP_RAW;
+      break;
+    }
+    if (!strcmp (mime, MIME_PM) || !strcmp (mime, MIME_AM)) {
+      s->info.type = GST_PNM_TYPE_PIXMAP_RAW;
+      break;
+    }
+  }
+  if (i == gst_caps_get_size (caps))
+    return FALSE;
+  s->info.max = 255;
+  s->info.fields |= GST_PNM_INFO_FIELDS_TYPE | GST_PNM_INFO_FIELDS_MAX;
+
+  return TRUE;
+}
+
+static void
+gst_pnmenc_init (GstPnmenc * s, GstPnmencClass * klass)
+{
+  GstPad *pad;
+
+  pad =
+      gst_pad_new_from_template (gst_static_pad_template_get
+      (&sink_pad_template), "sink");
+  gst_pad_set_setcaps_function (pad, gst_pnmenc_setcaps_func_sink);
+  gst_pad_set_chain_function (pad, gst_pnmenc_chain);
+  gst_element_add_pad (GST_ELEMENT (s), pad);
+
+  pad =
+      gst_pad_new_from_template (gst_static_pad_template_get
+      (&src_pad_template), "src");
+  gst_pad_set_setcaps_function (pad, gst_pnmenc_setcaps_func_src);
+  gst_element_add_pad (GST_ELEMENT (s), pad);
+}
+
+static void
+gst_pnmenc_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+  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_details (element_class, &pnmenc_details);
+}
+
+static void
+gst_pnmenc_class_init (GstPnmencClass * klass)
+{
+  /* Nothing to see here. Move along. */
+}
+
+GST_BOILERPLATE (GstPnmenc, gst_pnmenc, GstElement, GST_TYPE_ELEMENT)