gstreamer/ext/gdk_pixbuf/gstgdkpixbuf.c

/* GStreamer GdkPixbuf-based image decoder
 * Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
 * Copyright (C) 2003 David A. Schleef <ds@schleef.org>
 *
 * 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <string.h>

#include "gstgdkpixbuf.h"
#include "gstgdkpixbufsink.h"
#include "pixbufscale.h"

GST_DEBUG_CATEGORY_STATIC (gst_gdk_pixbuf_debug);
#define GST_CAT_DEFAULT gst_gdk_pixbuf_debug

static const GstElementDetails plugin_details =
GST_ELEMENT_DETAILS ("GdkPixbuf image decoder",
    "Codec/Decoder/Image",
    "Decodes images in a video stream using GdkPixbuf",
    "David A. Schleef <ds@schleef.org>, Renato Filho <renato.filho@indt.org.br>");

enum
{
  ARG_0,
  ARG_SILENT                    /* FIXME 0.11: remove */
};

static GstStaticPadTemplate gst_gdk_pixbuf_sink_template =
    GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("image/png; "
        /* "image/jpeg; " disabled because we can't handle MJPEG */
        "image/gif; "
        "image/x-icon; "
        "application/x-navi-animation; "
        "image/x-cmu-raster; "
        "image/x-sun-raster; "
        "image/x-pixmap; "
        "image/tiff; "
        "image/x-portable-anymap; "
        "image/x-portable-bitmap; "
        "image/x-portable-graymap; "
        "image/x-portable-pixmap; "
        "image/bmp; "
        "image/x-bmp; "
        "image/x-MS-bmp; "
        "image/vnd.wap.wbmp; " "image/x-bitmap; " "image/x-tga; "
        "image/x-pcx; image/svg; image/svg+xml")
    );

static GstStaticPadTemplate gst_gdk_pixbuf_src_template =
    GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB "; " GST_VIDEO_CAPS_RGBA)
    );

static void gst_gdk_pixbuf_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);
static void gst_gdk_pixbuf_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);

static GstStateChangeReturn
gst_gdk_pixbuf_change_state (GstElement * element, GstStateChange transition);
static GstFlowReturn gst_gdk_pixbuf_chain (GstPad * pad, GstBuffer * buffer);
static gboolean gst_gdk_pixbuf_sink_event (GstPad * pad, GstEvent * event);

#ifdef enable_typefind
static void gst_gdk_pixbuf_type_find (GstTypeFind * tf, gpointer ignore);
#endif

GST_BOILERPLATE (GstGdkPixbuf, gst_gdk_pixbuf, GstElement, GST_TYPE_ELEMENT);

static gboolean
gst_gdk_pixbuf_sink_setcaps (GstPad * pad, GstCaps * caps)
{
  GstGdkPixbuf *filter;
  const GValue *framerate;
  GstStructure *s;

  filter = GST_GDK_PIXBUF (GST_PAD_PARENT (pad));
  s = gst_caps_get_structure (caps, 0);

  if ((framerate = gst_structure_get_value (s, "framerate")) != NULL) {
    filter->framerate_numerator = gst_value_get_fraction_numerator (framerate);
    filter->framerate_denominator =
        gst_value_get_fraction_denominator (framerate);
    GST_DEBUG_OBJECT (filter, "got framerate of %d/%d fps => packetized mode",
        filter->framerate_numerator, filter->framerate_denominator);
  } else {
    filter->framerate_numerator = 0;
    filter->framerate_denominator = 1;
    GST_DEBUG_OBJECT (filter, "no framerate, assuming single image");
  }

  return TRUE;
}

static GstCaps *
gst_gdk_pixbuf_get_capslist (void)
{
  GSList *slist;
  GSList *slist0;
  GstCaps *capslist = NULL;
  GstCaps *return_caps = NULL;

  capslist = gst_caps_new_empty ();
  slist0 = gdk_pixbuf_get_formats ();

  for (slist = slist0; slist; slist = g_slist_next (slist)) {
    GdkPixbufFormat *pixbuf_format;
    char **mimetypes;
    char **mimetype;

    pixbuf_format = slist->data;
    mimetypes = gdk_pixbuf_format_get_mime_types (pixbuf_format);

    for (mimetype = mimetypes; *mimetype; mimetype++) {
      gst_caps_append_structure (capslist, gst_structure_new (*mimetype, NULL));
    }
    g_strfreev (mimetypes);
  }
  g_slist_free (slist0);

  return_caps = gst_caps_intersect (capslist,
      gst_static_caps_get (&gst_gdk_pixbuf_sink_template.static_caps));

  gst_caps_unref (capslist);
  return return_caps;
}

static GstCaps *
gst_gdk_pixbuf_sink_getcaps (GstPad * pad)
{
  return gst_gdk_pixbuf_get_capslist ();
}

static void
gst_gdk_pixbuf_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 (&gst_gdk_pixbuf_src_template));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_gdk_pixbuf_sink_template));
  gst_element_class_set_details (element_class, &plugin_details);
}

/* initialize the plugin's class */
static void
gst_gdk_pixbuf_class_init (GstGdkPixbufClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;

  gobject_class->set_property = gst_gdk_pixbuf_set_property;
  gobject_class->get_property = gst_gdk_pixbuf_get_property;

  g_object_class_install_property (gobject_class, ARG_SILENT,
      g_param_spec_boolean ("silent", "Silent",
          "Produce verbose output ? (deprecated)", FALSE, G_PARAM_READWRITE));

  gstelement_class->change_state =
      GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_change_state);
}

static void
gst_gdk_pixbuf_init (GstGdkPixbuf * filter, GstGdkPixbufClass * klass)
{
  filter->sinkpad =
      gst_pad_new_from_static_template (&gst_gdk_pixbuf_sink_template, "sink");
  gst_pad_set_setcaps_function (filter->sinkpad,
      GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_sink_setcaps));
  gst_pad_set_getcaps_function (filter->sinkpad,
      GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_sink_getcaps));
  gst_pad_set_chain_function (filter->sinkpad,
      GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_chain));
  gst_pad_set_event_function (filter->sinkpad,
      GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_sink_event));
  gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);

  filter->srcpad =
      gst_pad_new_from_static_template (&gst_gdk_pixbuf_src_template, "src");
  gst_pad_use_fixed_caps (filter->srcpad);
  gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);

  filter->last_timestamp = GST_CLOCK_TIME_NONE;
  filter->pixbuf_loader = NULL;
}

static GstFlowReturn
gst_gdk_pixbuf_flush (GstGdkPixbuf * filter)
{
  GstBuffer *outbuf;
  GdkPixbuf *pixbuf;
  int y;
  guint8 *out_pix;
  guint8 *in_pix;
  int in_rowstride;
  GstFlowReturn ret;
  GstCaps *caps = NULL;
  gint n_channels;

  pixbuf = gdk_pixbuf_loader_get_pixbuf (filter->pixbuf_loader);
  if (pixbuf == NULL)
    goto no_pixbuf;

  if (filter->image_size == 0) {
    filter->width = gdk_pixbuf_get_width (pixbuf);
    filter->height = gdk_pixbuf_get_height (pixbuf);
    filter->rowstride = gdk_pixbuf_get_rowstride (pixbuf);
    filter->image_size = filter->rowstride * filter->height;

    n_channels = gdk_pixbuf_get_n_channels (pixbuf);
    switch (n_channels) {
      case 3:
        caps = gst_caps_from_string (GST_VIDEO_CAPS_RGB);
        break;
      case 4:
        caps = gst_caps_from_string (GST_VIDEO_CAPS_RGBA);
        break;
      default:
        goto channels_not_supported;
    }

    gst_caps_set_simple (caps,
        "width", G_TYPE_INT, filter->width,
        "height", G_TYPE_INT, filter->height,
        "framerate", GST_TYPE_FRACTION, filter->framerate_numerator,
        filter->framerate_denominator, NULL);

    GST_DEBUG ("Set size to %dx%d", filter->width, filter->height);
    gst_pad_set_caps (filter->srcpad, caps);
    gst_caps_unref (caps);
  }

  ret = gst_pad_alloc_buffer_and_set_caps (filter->srcpad,
      GST_BUFFER_OFFSET_NONE,
      filter->image_size, GST_PAD_CAPS (filter->srcpad), &outbuf);

  if (ret != GST_FLOW_OK)
    goto no_buffer;

  GST_BUFFER_TIMESTAMP (outbuf) = filter->last_timestamp;
  GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;

  in_pix = gdk_pixbuf_get_pixels (pixbuf);
  in_rowstride = gdk_pixbuf_get_rowstride (pixbuf);
  out_pix = GST_BUFFER_DATA (outbuf);

  /* FIXME, last line might not have rowstride pixels */
  for (y = 0; y < filter->height; y++) {
    memcpy (out_pix, in_pix, filter->rowstride);
    in_pix += in_rowstride;
    out_pix += filter->rowstride;
  }

  GST_DEBUG ("pushing... %d bytes", GST_BUFFER_SIZE (outbuf));
  ret = gst_pad_push (filter->srcpad, outbuf);

  if (ret != GST_FLOW_OK)
    GST_DEBUG_OBJECT (filter, "flow: %s", gst_flow_get_name (ret));

  return ret;

  /* ERRORS */
no_pixbuf:
  {
    GST_ELEMENT_ERROR (filter, STREAM, DECODE, (NULL), ("error geting pixbuf"));
    return GST_FLOW_ERROR;
  }
channels_not_supported:
  {
    GST_ELEMENT_ERROR (filter, STREAM, DECODE, (NULL),
        ("%d channels not supported", n_channels));
    return GST_FLOW_ERROR;
  }
no_buffer:
  {
    GST_DEBUG ("Failed to create outbuffer - %s", gst_flow_get_name (ret));
    return ret;
  }
}

static gboolean
gst_gdk_pixbuf_sink_event (GstPad * pad, GstEvent * event)
{
  GstFlowReturn res = GST_FLOW_OK;
  gboolean ret = TRUE;
  GstGdkPixbuf *pixbuf;

  pixbuf = GST_GDK_PIXBUF (gst_pad_get_parent (pad));

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_EOS:
      if (pixbuf->pixbuf_loader != NULL) {
        gdk_pixbuf_loader_close (pixbuf->pixbuf_loader, NULL);
        res = gst_gdk_pixbuf_flush (pixbuf);
        g_object_unref (G_OBJECT (pixbuf->pixbuf_loader));
        pixbuf->pixbuf_loader = NULL;
        /* as long as we don't have flow returns for event functions we need
         * to post an error here, or the application might never know that
         * things failed */
        if (res != GST_FLOW_OK && res != GST_FLOW_WRONG_STATE) {
          GST_ELEMENT_ERROR (pixbuf, STREAM, FAILED, (NULL),
              ("Flow: %s", gst_flow_get_name (res)));
        }
      }
      break;
    case GST_EVENT_NEWSEGMENT:
    case GST_EVENT_FLUSH_STOP:
      if (pixbuf->pixbuf_loader != NULL) {
        gdk_pixbuf_loader_close (pixbuf->pixbuf_loader, NULL);
        g_object_unref (G_OBJECT (pixbuf->pixbuf_loader));
        pixbuf->pixbuf_loader = NULL;
      }
      break;
    default:
      break;
  }

  if (res == GST_FLOW_OK) {
    ret = gst_pad_event_default (pad, event);
  } else {
    ret = FALSE;
  }

  gst_object_unref (pixbuf);

  return ret;
}

static GstFlowReturn
gst_gdk_pixbuf_chain (GstPad * pad, GstBuffer * buf)
{
  GstGdkPixbuf *filter;
  GstFlowReturn ret = GST_FLOW_OK;
  GError *error = NULL;
  GstClockTime timestamp;
  guint8 *data;
  guint size;

  filter = GST_GDK_PIXBUF (gst_pad_get_parent (pad));

  timestamp = GST_BUFFER_TIMESTAMP (buf);

  if (GST_CLOCK_TIME_IS_VALID (timestamp))
    filter->last_timestamp = timestamp;

  GST_LOG_OBJECT (filter, "buffer with ts: %" GST_TIME_FORMAT,
      GST_TIME_ARGS (timestamp));

  if (filter->pixbuf_loader == NULL)
    filter->pixbuf_loader = gdk_pixbuf_loader_new ();

  data = GST_BUFFER_DATA (buf);
  size = GST_BUFFER_SIZE (buf);

  GST_LOG_OBJECT (filter, "Writing buffer size %d", size);
  if (!gdk_pixbuf_loader_write (filter->pixbuf_loader, data, size, &error))
    goto error;

  /* packetised mode? */
  if (filter->framerate_numerator != 0) {
    gdk_pixbuf_loader_close (filter->pixbuf_loader, NULL);
    ret = gst_gdk_pixbuf_flush (filter);
    g_object_unref (filter->pixbuf_loader);
    filter->pixbuf_loader = NULL;
  }

  gst_buffer_unref (buf);
  gst_object_unref (filter);

  return ret;

  /* ERRORS */
error:
  {
    GST_ELEMENT_ERROR (filter, STREAM, DECODE, (NULL),
        ("gdk_pixbuf_loader_write error: %s", error->message));
    g_error_free (error);
    gst_buffer_unref (buf);
    gst_object_unref (filter);
    return GST_FLOW_ERROR;
  }
}

static void
gst_gdk_pixbuf_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  switch (prop_id) {
    case ARG_SILENT:
      /* filter->silent = g_value_get_boolean (value); */
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
gst_gdk_pixbuf_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec)
{
  switch (prop_id) {
    case ARG_SILENT:
      /* g_value_set_boolean (value, filter->silent); */
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static GstStateChangeReturn
gst_gdk_pixbuf_change_state (GstElement * element, GstStateChange transition)
{
  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
  GstGdkPixbuf *dec = GST_GDK_PIXBUF (element);

  switch (transition) {
    case GST_STATE_CHANGE_READY_TO_PAUSED:
      /* default to single image mode, setcaps function might not be called */
      dec->framerate_numerator = 0;
      dec->framerate_denominator = 1;
      break;
    default:
      break;
  }

  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
  if (ret == GST_STATE_CHANGE_FAILURE)
    return ret;

  switch (transition) {
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      dec->framerate_numerator = 0;
      dec->framerate_denominator = 0;
      break;
    default:
      break;
  }

  return ret;
}

#define GST_GDK_PIXBUF_TYPE_FIND_SIZE 1024

#ifdef enable_typefind
static void
gst_gdk_pixbuf_type_find (GstTypeFind * tf, gpointer ignore)
{
  guint8 *data;
  GdkPixbufLoader *pixbuf_loader;
  GdkPixbufFormat *format;

  data = gst_type_find_peek (tf, 0, GST_GDK_PIXBUF_TYPE_FIND_SIZE);
  if (data == NULL)
    return;

  GST_DEBUG ("creating new loader");

  pixbuf_loader = gdk_pixbuf_loader_new ();

  gdk_pixbuf_loader_write (pixbuf_loader, data, GST_GDK_PIXBUF_TYPE_FIND_SIZE,
      NULL);

  format = gdk_pixbuf_loader_get_format (pixbuf_loader);

  if (format != NULL) {
    GstCaps *caps;
    gchar **p;
    gchar **mlist = gdk_pixbuf_format_get_mime_types (format);

    for (p = mlist; *p; ++p) {
      GST_DEBUG ("suggesting mime type %s", *p);
      caps = gst_caps_new_simple (*p, NULL);
      gst_type_find_suggest (tf, GST_TYPE_FIND_MINIMUM, caps);
      gst_caps_free (caps);
    }
    g_strfreev (mlist);
  }

  GST_DEBUG ("closing pixbuf loader, hope it doesn't hang ...");
  /* librsvg 2.4.x has a bug where it triggers an endless loop in trying
     to close a gzip that's not an svg; fixed upstream but no good way
     to work around it */
  gdk_pixbuf_loader_close (pixbuf_loader, NULL);
  GST_DEBUG ("closed pixbuf loader");
  g_object_unref (G_OBJECT (pixbuf_loader));
}
#endif

/* entry point to initialize the plug-in
 * initialize the plug-in itself
 * register the element factories and pad templates
 * register the features
 */
static gboolean
plugin_init (GstPlugin * plugin)
{
  GST_DEBUG_CATEGORY_INIT (gst_gdk_pixbuf_debug, "gdkpixbuf", 0,
      "gdk pixbuf loader");

  if (!gst_element_register (plugin, "gdkpixbufdec", GST_RANK_MARGINAL,
          GST_TYPE_GDK_PIXBUF))
    return FALSE;

#ifdef enable_typefind
  gst_type_find_register (plugin, "image/*", GST_RANK_MARGINAL,
      gst_gdk_pixbuf_type_find, NULL, GST_CAPS_ANY, NULL);
#endif

  if (!gst_element_register (plugin, "gdkpixbufsink", GST_RANK_NONE,
          GST_TYPE_GDK_PIXBUF_SINK))
    return FALSE;

  if (!pixbufscale_init (plugin))
    return FALSE;

  /* plugin initialisation succeeded */
  return TRUE;
}


/* this is the structure that gst-register looks for
 * so keep the name plugin_desc, or you cannot get your plug-in registered */
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "gdkpixbuf",
    "GdkPixbuf-based image decoder, scaler and sink",
    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)