gesdemux.c 8.46 KB
Newer Older
1 2
/* GStreamer GES plugin
 *
Thibault Saunier's avatar
Thibault Saunier committed
3 4
 * Copyright (C) 2019 Igalia S.L
 *     Author: 2019 Thibault Saunier <tsaunier@igalia.com>
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
 *
 * gesdemux.c
 *
 * 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.
Thibault Saunier's avatar
Thibault Saunier committed
22
 */
23

Thibault Saunier's avatar
Thibault Saunier committed
24
 /**
25 26 27 28 29 30 31 32 33 34 35 36 37 38
 * SECTION:gstdemux
 * @short_description: A GstBin subclasses use to use GESTimeline
 * as demux inside any GstPipeline.
 * @see_also: #GESTimeline
 *
 * The gstdemux is a bin that will simply expose the track source pads
 * and implements the GstUriHandler interface using a custom ges://0Xpointer
 * uri scheme.
 **/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

39 40
#include "gesbasebin.h"

41 42 43
#include <gst/gst.h>
#include <glib/gstdio.h>
#include <gst/pbutils/pbutils.h>
44 45
#include <gst/base/gstadapter.h>
#include <ges/ges.h>
46 47 48 49 50 51 52 53 54

GST_DEBUG_CATEGORY_STATIC (gesdemux);
#define GST_CAT_DEFAULT gesdemux

static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("application/xges"));

55
G_DECLARE_FINAL_TYPE (GESDemux, ges_demux, GES, Demux, GESBaseBin);
56 57 58

struct _GESDemux
{
59
  GESBaseBin parent;
60 61 62 63 64 65 66

  GESTimeline *timeline;
  GstPad *sinkpad;

  GstAdapter *input_adapter;
};

67
G_DEFINE_TYPE (GESDemux, ges_demux, ges_base_bin_get_type ());
68
#define GES_DEMUX(obj) ((GESDemux*)obj)
69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86

enum
{
  PROP_0,
  PROP_TIMELINE,
  PROP_LAST
};

static GParamSpec *properties[PROP_LAST];

static void
ges_demux_get_property (GObject * object, guint property_id,
    GValue * value, GParamSpec * pspec)
{
  GESDemux *self = GES_DEMUX (object);

  switch (property_id) {
    case PROP_TIMELINE:
87 88
      g_value_set_object (value,
          ges_base_bin_get_timeline (GES_BASE_BIN (self)));
89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  }
}

static void
ges_demux_set_property (GObject * object, guint property_id,
    const GValue * value, GParamSpec * pspec)
{
  switch (property_id) {
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  }
}

static void
ges_demux_class_init (GESDemuxClass * self_class)
{
  GObjectClass *gclass = G_OBJECT_CLASS (self_class);
  GstElementClass *gstelement_klass = GST_ELEMENT_CLASS (self_class);

  GST_DEBUG_CATEGORY_INIT (gesdemux, "gesdemux", 0, "ges demux element");

  gclass->get_property = ges_demux_get_property;
  gclass->set_property = ges_demux_set_property;

  /**
   * GESDemux:timeline:
   *
   * Timeline to use in this source.
   */
  properties[PROP_TIMELINE] = g_param_spec_object ("timeline", "Timeline",
      "Timeline to use in this source.",
      GES_TYPE_TIMELINE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
124
  g_object_class_override_property (gclass, PROP_TIMELINE, "timeline");
125

126 127
  gst_element_class_add_pad_template (gstelement_klass,
      gst_static_pad_template_get (&sink_template));
128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166
  gst_element_class_set_static_metadata (gstelement_klass,
      "GStreamer Editing Services based 'demuxer'",
      "Codec/Demux/Editing",
      "Demuxer for complex timeline file formats using GES.",
      "Thibault Saunier <tsaunier@igalia.com");
}

typedef struct
{
  GESTimeline *timeline;
  GMainLoop *ml;
  GError *error;
  gulong loaded_sigid;
  gulong error_sigid;
} TimelineConstructionData;

static void
project_loaded_cb (GESProject * project, GESTimeline * timeline,
    TimelineConstructionData * data)
{
  data->timeline = timeline;
  g_signal_handler_disconnect (project, data->loaded_sigid);
  data->loaded_sigid = 0;

  g_main_loop_quit (data->ml);
}

static void
error_loading_asset_cb (GESProject * project, GError * error, gchar * id,
    GType extractable_type, TimelineConstructionData * data)
{
  data->error = g_error_copy (error);
  g_signal_handler_disconnect (project, data->error_sigid);
  data->error_sigid = 0;

  g_main_loop_quit (data->ml);
}

static gboolean
167
ges_demux_create_timeline (GESDemux * self, gchar * uri, GError ** error)
168
{
169
  GESProject *project = ges_project_new (uri);
170
  G_GNUC_UNUSED void *unused;
171 172
  TimelineConstructionData data = { 0, };
  GMainContext *ctx = g_main_context_new ();
173

174 175
  g_main_context_push_thread_default (ctx);
  data.ml = g_main_loop_new (ctx, TRUE);
176

177
  data.loaded_sigid =
178
      g_signal_connect (project, "loaded", G_CALLBACK (project_loaded_cb),
179 180 181 182
      &data);
  data.error_sigid =
      g_signal_connect_after (project, "error-loading-asset",
      G_CALLBACK (error_loading_asset_cb), &data);
183

184 185 186
  unused = GES_TIMELINE (ges_asset_extract (GES_ASSET (project), &data.error));
  if (data.error) {
    *error = data.error;
187 188 189 190

    goto done;
  }

191 192
  g_main_loop_run (data.ml);
  g_main_loop_unref (data.ml);
193 194

done:
195 196
  if (data.loaded_sigid)
    g_signal_handler_disconnect (project, data.loaded_sigid);
197

198 199
  if (data.error_sigid)
    g_signal_handler_disconnect (project, data.error_sigid);
200

201
  g_clear_object (&project);
202

203 204 205
  GST_INFO_OBJECT (self, "Timeline properly loaded: %" GST_PTR_FORMAT,
      data.timeline);
  ges_base_bin_set_timeline (GES_BASE_BIN (self), data.timeline);
206

207
  g_main_context_pop_thread_default (ctx);
208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235

  return G_SOURCE_REMOVE;
}

static gboolean
ges_demux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
  GESDemux *self = GES_DEMUX (parent);

  switch (event->type) {
    case GST_EVENT_EOS:{
      GstMapInfo map;
      GstBuffer *xges_buffer;
      gboolean ret = TRUE;
      gsize available;

      available = gst_adapter_available (self->input_adapter);
      if (available == 0) {
        GST_WARNING_OBJECT (self,
            "Received EOS without any serialized timeline.");

        return gst_pad_event_default (pad, parent, event);
      }

      xges_buffer = gst_adapter_take_buffer (self->input_adapter, available);
      if (gst_buffer_map (xges_buffer, &map, GST_MAP_READ)) {
        GError *err = NULL;
        gchar *filename = NULL, *uri = NULL;
236
        GError *error = NULL;
237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
        gint f = g_file_open_tmp (NULL, &filename, &err);

        if (err) {
          GST_ELEMENT_ERROR (self, RESOURCE, OPEN_WRITE,
              ("Could not open temporary file to write timeline description"),
              ("%s", err->message));

          goto error;
        }

        g_file_set_contents (filename, (gchar *) map.data, map.size, &err);
        if (err) {
          GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
              ("Could not write temporary timeline description file"),
              ("%s", err->message));

          goto error;
        }

256
        uri = gst_filename_to_uri (filename, NULL);
257
        GST_INFO_OBJECT (self, "Pre loading the timeline.");
258

259 260
        ges_demux_create_timeline (self, uri, &error);
        if (error)
261 262 263 264 265 266 267
          goto error;

      done:
        g_free (filename);
        g_free (uri);
        g_close (f, NULL);
        return ret;
268

269 270
      error:
        ret = FALSE;
271 272 273 274 275
        gst_element_post_message (GST_ELEMENT (self),
            gst_message_new_error (parent, error,
                "Could not create timeline from description"));
        g_clear_error (&error);

276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317
        goto done;
      } else {
        GST_ELEMENT_ERROR (self, RESOURCE, READ,
            ("Could not map buffer containing timeline description"),
            ("Not info"));
      }
    }
    default:
      break;
  }

  return gst_pad_event_default (pad, parent, event);
}

static GstFlowReturn
ges_demux_sink_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
  GESDemux *self = GES_DEMUX (parent);

  gst_adapter_push (self->input_adapter, buffer);

  GST_INFO_OBJECT (self, "Received buffer, total size is %i bytes",
      (gint) gst_adapter_available (self->input_adapter));

  return GST_FLOW_OK;
}

static void
ges_demux_init (GESDemux * self)
{
  ges_init ();
  self->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
  gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);

  self->input_adapter = gst_adapter_new ();

  gst_pad_set_chain_function (self->sinkpad,
      GST_DEBUG_FUNCPTR (ges_demux_sink_chain));

  gst_pad_set_event_function (self->sinkpad,
      GST_DEBUG_FUNCPTR (ges_demux_sink_event));
}