gstreamer/ext/mimic/gstmimdec.c

/*
 * GStreamer
 * Copyright (c) 2005 INdT.
 * @author Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>
 * @author Rob Taylor <robtaylor@fastmail.fm>
 * @author Philippe Khalaf <burger@speedy.org>
 * @author Ole André Vadla Ravnås <oleavr@gmail.com>
 *
 * 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-mimdec
 * @see_also: mimenc
 *
 * The MIMIC codec is used by MSN Messenger's webcam support. It consumes the
 * TCP header for the MIMIC codec.
 *
 * Its fourcc is ML20.
 */

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

#include <gst/gst.h>

#include "gstmimdec.h"

GST_DEBUG_CATEGORY (mimdec_debug);
#define GST_CAT_DEFAULT (mimdec_debug)

static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("video/x-mimic")
    );

static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("video/x-raw-rgb, "
        "bpp = (int) 24, "
        "depth = (int) 24, "
        "endianness = (int) 4321, "
        "framerate = (fraction) 0/1, "
        "red_mask = (int) 16711680, "
        "green_mask = (int) 65280, "
        "blue_mask = (int) 255, "
        "width = (int) 320, "
        "height = (int) 240"
        ";video/x-raw-rgb, "
        "bpp = (int) 24, "
        "depth = (int) 24, "
        "endianness = (int) 4321, "
        "framerate = (fraction) 0/1, "
        "red_mask = (int) 16711680, "
        "green_mask = (int) 65280, "
        "blue_mask = (int) 255, " "width = (int) 160, " "height = (int) 120")
    );

static void gst_mim_dec_finalize (GObject * object);

static GstFlowReturn gst_mim_dec_chain (GstPad * pad, GstBuffer * in);
static GstStateChangeReturn
gst_mim_dec_change_state (GstElement * element, GstStateChange transition);

static gboolean gst_mim_dec_sink_event (GstPad * pad, GstEvent * event);


GST_BOILERPLATE (GstMimDec, gst_mim_dec, GstElement, GST_TYPE_ELEMENT);

static void
gst_mim_dec_base_init (gpointer klass)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  gst_element_class_add_static_pad_template (element_class, &src_factory);
  gst_element_class_add_static_pad_template (element_class, &sink_factory);

  gst_element_class_set_details_simple (element_class,
      "Mimic Decoder",
      "Codec/Decoder/Video",
      "MSN Messenger compatible Mimic video decoder element",
      "Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>, "
      "Rob Taylor <robtaylor@fastmail.fm>, "
      "Philippe Khalaf <burger@speedy.org>, "
      "Ole André Vadla Ravnås <oleavr@gmail.com>,"
      "Olivier Crête <olivier.crete@collabora.co.uk");
}

static void
gst_mim_dec_class_init (GstMimDecClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
  gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_mim_dec_change_state);

  gobject_class->finalize = gst_mim_dec_finalize;

  GST_DEBUG_CATEGORY_INIT (mimdec_debug, "mimdec", 0, "Mimic decoder plugin");
}

static void
gst_mim_dec_init (GstMimDec * mimdec, GstMimDecClass * klass)
{
  mimdec->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
  gst_element_add_pad (GST_ELEMENT (mimdec), mimdec->sinkpad);
  gst_pad_set_chain_function (mimdec->sinkpad,
      GST_DEBUG_FUNCPTR (gst_mim_dec_chain));
  gst_pad_set_event_function (mimdec->sinkpad,
      GST_DEBUG_FUNCPTR (gst_mim_dec_sink_event));

  mimdec->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
  gst_element_add_pad (GST_ELEMENT (mimdec), mimdec->srcpad);

  mimdec->adapter = gst_adapter_new ();

  mimdec->dec = NULL;
  mimdec->buffer_size = -1;
}

static void
gst_mim_dec_finalize (GObject * object)
{
  GstMimDec *mimdec = GST_MIM_DEC (object);

  gst_adapter_clear (mimdec->adapter);
  g_object_unref (mimdec->adapter);

  GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
}

static GstFlowReturn
gst_mim_dec_chain (GstPad * pad, GstBuffer * buf)
{
  GstMimDec *mimdec;
  GstBuffer *out_buf;
  guchar *header, *frame_body;
  guint32 fourcc;
  guint16 header_size;
  gint width, height;
  GstCaps *caps;
  GstFlowReturn res = GST_FLOW_OK;
  GstClockTime in_time = GST_BUFFER_TIMESTAMP (buf);
  GstEvent *event = NULL;
  gboolean result = TRUE;
  guint32 payload_size;
  guint32 current_ts;

  g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);

  mimdec = GST_MIM_DEC (gst_pad_get_parent (pad));
  g_return_val_if_fail (GST_IS_MIM_DEC (mimdec), GST_FLOW_ERROR);

  gst_adapter_push (mimdec->adapter, buf);


  /* do we have enough bytes to read a header */
  while (gst_adapter_available (mimdec->adapter) >= 24) {
    header = (guchar *) gst_adapter_peek (mimdec->adapter, 24);
    header_size = header[0];
    if (header_size != 24) {
      gst_adapter_flush (mimdec->adapter, 24);
      GST_ELEMENT_ERROR (mimdec, STREAM, DECODE, (NULL),
          ("invalid frame: header size %d incorrect", header_size));
      res = GST_FLOW_ERROR;
      goto out;
    }

    if (header[1] == 1) {
      /* This is a a paused frame, skip it */
      gst_adapter_flush (mimdec->adapter, 24);
      continue;
    }

    fourcc = GUINT32_FROM_LE (*((guint32 *) (header + 12)));
    if (GST_MAKE_FOURCC ('M', 'L', '2', '0') != fourcc) {
      gst_adapter_flush (mimdec->adapter, 24);
      GST_ELEMENT_ERROR (mimdec, STREAM, WRONG_TYPE, (NULL),
          ("invalid frame: unknown FOURCC code %X (%" GST_FOURCC_FORMAT ")",
              fourcc, GST_FOURCC_ARGS (fourcc)));
      res = GST_FLOW_ERROR;
      goto out;
    }

    payload_size = GUINT32_FROM_LE (*((guint32 *) (header + 8)));

    current_ts = GUINT32_FROM_LE (*((guint32 *) (header + 20)));

    GST_LOG_OBJECT (mimdec, "Got packet, payload size %d", payload_size);

    if (gst_adapter_available (mimdec->adapter) < payload_size + 24)
      goto out;

    /* We have a whole packet and have read the header, lets flush it out */
    gst_adapter_flush (mimdec->adapter, 24);

    frame_body = (guchar *) gst_adapter_peek (mimdec->adapter, payload_size);

    if (mimdec->buffer_size < 0) {
      /* Check if its a keyframe, otherwise skip it */
      if (GUINT32_FROM_LE (*((guint32 *) (frame_body + 12))) != 0) {
        gst_adapter_flush (mimdec->adapter, payload_size);
        res = GST_FLOW_OK;
        goto out;
      }

      if (!mimic_decoder_init (mimdec->dec, frame_body)) {
        gst_adapter_flush (mimdec->adapter, payload_size);
        GST_ELEMENT_ERROR (mimdec, LIBRARY, INIT, (NULL),
            ("mimic_decoder_init error"));
        res = GST_FLOW_ERROR;
        goto out;
      }

      if (!mimic_get_property (mimdec->dec, "buffer_size",
              &mimdec->buffer_size)) {
        gst_adapter_flush (mimdec->adapter, payload_size);
        GST_ELEMENT_ERROR (mimdec, LIBRARY, INIT, (NULL),
            ("mimic_get_property('buffer_size') error"));
        res = GST_FLOW_ERROR;
        goto out;
      }
    }


    if (mimdec->need_newsegment) {
      if (GST_CLOCK_TIME_IS_VALID (in_time))
        event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME,
            in_time, -1, 0);
      else
        event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME,
            current_ts * GST_MSECOND, -1, 0);
    }
    mimdec->need_newsegment = FALSE;

    if (event)
      result = gst_pad_push_event (mimdec->srcpad, event);
    event = NULL;

    if (!result) {
      GST_WARNING_OBJECT (mimdec, "gst_pad_push_event failed");
      res = GST_FLOW_ERROR;
      goto out;
    }


    out_buf = gst_buffer_new_and_alloc (mimdec->buffer_size);

    if (!mimic_decode_frame (mimdec->dec, frame_body,
            GST_BUFFER_DATA (out_buf))) {
      GST_WARNING_OBJECT (mimdec, "mimic_decode_frame error\n");

      gst_adapter_flush (mimdec->adapter, payload_size);

      gst_buffer_unref (out_buf);
      GST_ELEMENT_ERROR (mimdec, STREAM, DECODE, (NULL),
          ("mimic_decode_frame error"));
      res = GST_FLOW_ERROR;
      goto out;
    }
    gst_adapter_flush (mimdec->adapter, payload_size);

    if (GST_CLOCK_TIME_IS_VALID (in_time))
      GST_BUFFER_TIMESTAMP (out_buf) = in_time;
    else
      GST_BUFFER_TIMESTAMP (out_buf) = current_ts * GST_MSECOND;

    mimic_get_property (mimdec->dec, "width", &width);
    mimic_get_property (mimdec->dec, "height", &height);
    GST_DEBUG_OBJECT (mimdec,
        "got WxH %d x %d payload size %d buffer_size %d",
        width, height, payload_size, mimdec->buffer_size);
    caps = gst_caps_new_simple ("video/x-raw-rgb",
        "bpp", G_TYPE_INT, 24,
        "depth", G_TYPE_INT, 24,
        "endianness", G_TYPE_INT, 4321,
        "red_mask", G_TYPE_INT, 16711680,
        "green_mask", G_TYPE_INT, 65280,
        "blue_mask", G_TYPE_INT, 255,
        "framerate", GST_TYPE_FRACTION, 0, 1,
        "width", G_TYPE_INT, width, "height", G_TYPE_INT, height, NULL);
    gst_buffer_set_caps (out_buf, caps);
    gst_caps_unref (caps);
    res = gst_pad_push (mimdec->srcpad, out_buf);

    if (res != GST_FLOW_OK)
      break;
  }

out:
  gst_object_unref (mimdec);

  return res;

}

static GstStateChangeReturn
gst_mim_dec_change_state (GstElement * element, GstStateChange transition)
{
  GstMimDec *mimdec;
  GstStateChangeReturn ret;

  mimdec = GST_MIM_DEC (element);

  switch (transition) {
    case GST_STATE_CHANGE_NULL_TO_READY:
      mimdec->dec = mimic_open ();
      if (!mimdec) {
        GST_ERROR_OBJECT (mimdec, "mimic_open failed");
        return GST_STATE_CHANGE_FAILURE;
      }
      break;

    case GST_STATE_CHANGE_READY_TO_PAUSED:
      mimdec->need_newsegment = TRUE;
      gst_adapter_clear (mimdec->adapter);
      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_READY_TO_NULL:
      if (mimdec->dec != NULL) {
        mimic_close (mimdec->dec);
        mimdec->dec = NULL;
        mimdec->buffer_size = -1;
      }
      break;
    default:
      break;
  }

  return ret;
}

static gboolean
gst_mim_dec_sink_event (GstPad * pad, GstEvent * event)
{
  gboolean res = TRUE;
  GstMimDec *mimdec = GST_MIM_DEC (gst_pad_get_parent (pad));

  /*
   * Ignore upstream newsegment event, its EVIL, we should implement
   * proper seeking instead
   */
  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_NEWSEGMENT:
    {
      gboolean update;
      GstFormat format;
      gdouble rate, arate;
      gint64 start, stop, time;

      gst_event_parse_new_segment_full (event, &update, &rate, &arate,
          &format, &start, &stop, &time);

      /* we need TIME and a positive rate */
      if (format != GST_FORMAT_TIME)
        goto newseg_wrong_format;

      if (rate <= 0.0)
        goto newseg_wrong_rate;

      mimdec->need_newsegment = FALSE;

      break;
    }
    case GST_EVENT_FLUSH_STOP:
      mimdec->need_newsegment = TRUE;
      gst_adapter_clear (mimdec->adapter);
      break;
    default:
      break;
  }

  res = gst_pad_push_event (mimdec->srcpad, event);

done:

  gst_object_unref (mimdec);

  return res;

newseg_wrong_format:
  {
    GST_DEBUG_OBJECT (mimdec, "received non TIME newsegment");
    gst_event_unref (event);
    goto done;
  }
newseg_wrong_rate:
  {
    GST_DEBUG_OBJECT (mimdec, "negative rates not supported yet");
    gst_event_unref (event);
    goto done;
  }


}