sys/v4l2/gstv4l2mtkjpegdec.c

/*
 * Copyright (c) 2016 MediaTek Inc
 *     Author: Rick Chang <rick.chang@mediatek.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., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

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

#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>

#include "gstv4l2mtkjpegdec.h"
#include "v4l2_calls.h"

#include <string.h>
#include <gst/gst-i18n-plugin.h>

GST_DEBUG_CATEGORY_STATIC (gst_v4l2_mtk_jpeg_dec_debug);
#define GST_CAT_DEFAULT gst_v4l2_mtk_jpeg_dec_debug

typedef struct
{
  gchar *device;
  GstCaps *sink_caps;
  GstCaps *src_caps;
} GstV4l2MtkJpegDecCData;

enum
{
  PROP_0,
  V4L2_STD_OBJECT_PROPS,
};

static GstStaticPadTemplate gst_mtk_jpeg_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ "
            "I420, Y42B, I422 } "))
    );

#define gst_v4l2_mtk_jpeg_dec_parent_class parent_class
G_DEFINE_TYPE (GstV4l2MtkJpegDec, gst_v4l2_mtk_jpeg_dec, GST_TYPE_V4L2_VIDEO_DEC);

static void
gst_v4l2_mtk_jpeg_dec_init (GstV4l2MtkJpegDec * self)
{
}

static void
gst_v4l2_mtk_jpeg_dec_subinstance_init (GTypeInstance * instance, gpointer g_class)
{
  GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
  GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (instance);
  GstVideoDecoder *decoder = GST_VIDEO_DECODER (instance);

  gst_video_decoder_set_packetized (decoder, TRUE);

  self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
      GST_VIDEO_DECODER_SINK_PAD (decoder), V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
      gst_v4l2_get_output, gst_v4l2_set_output, NULL);
  self->v4l2output->no_initial_format = TRUE;
  self->v4l2output->keep_aspect = FALSE;

  self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
      GST_VIDEO_DECODER_SRC_PAD (decoder), V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
      gst_v4l2_get_input, gst_v4l2_set_input, NULL);
  self->v4l2capture->no_initial_format = TRUE;
  self->v4l2output->keep_aspect = FALSE;
}

static void
gst_v4l2_mtk_jpeg_dec_class_init (GstV4l2MtkJpegDecClass * klass)
{
  GstElementClass *element_class;
  GObjectClass *gobject_class;
  GstV4l2VideoDecClass *v4l2_decoder_class;
  GstVideoEncoderClass *baseclass;

  parent_class = g_type_class_peek_parent (klass);

  element_class = (GstElementClass *) klass;
  gobject_class = (GObjectClass *) klass;
  v4l2_decoder_class = GST_V4L2_VIDEO_DEC_CLASS (klass);
  baseclass = GST_VIDEO_DECODER_CLASS (klass);

  GST_DEBUG_CATEGORY_INIT (gst_v4l2_mtk_jpeg_dec_debug, "v4l2mtkjpegdec", 0,
      "V4L2 Mtk Jpeg HW Decoder");

  gst_element_class_set_static_metadata (element_class,
      "V4L2 Mtk Jpeg HW Decoder",
      "Codec/Decoder/Image",
      "MTK jpeg HW decode via V4L2 API",
      "Rick Chang <rick.chang@mediatek.com>");
}

static void
gst_v4l2_mtk_jpeg_dec_subclass_init (gpointer g_class, gpointer data)
{
  GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
  GstV4l2MtkJpegDecCData *cdata = data;

  klass->default_device = cdata->device;

  /* Note: gst_pad_template_new() take the floating ref from the caps */
  gst_element_class_add_pad_template (element_class,
      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
          cdata->sink_caps));
  gst_element_class_add_pad_template (element_class,
      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
          cdata->src_caps));

  g_free (cdata);
}

gboolean
gst_v4l2_is_mtk_jpeg_dec (GstCaps * sink_caps, GstCaps * src_caps)
{
  gboolean ret = FALSE;
  GstCaps *caps = gst_caps_new_empty_simple ("image/jpeg");

  if (gst_caps_is_subset (sink_caps, caps)
      && gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ()))
    ret = TRUE;

  gst_caps_ref (caps);
  return ret;
}

gboolean
gst_v4l2_mtk_jpeg_dec_register (GstPlugin * plugin, const gchar * basename,
    const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
{
  GTypeQuery type_query;
  GTypeInfo type_info = { 0, };
  GType type, subtype;
  gchar *type_name;
  GstV4l2MtkJpegDecCData *cdata;

  cdata = g_new0 (GstV4l2MtkJpegDecCData, 1);
  cdata->device = g_strdup (device_path);
  cdata->sink_caps = gst_caps_ref (sink_caps);
  cdata->src_caps = gst_static_pad_template_get_caps(&gst_mtk_jpeg_src_template);

  type = gst_v4l2_mtk_jpeg_dec_get_type ();
  g_type_query (type, &type_query);
  memset (&type_info, 0, sizeof (type_info));
  type_info.class_size = type_query.class_size;
  type_info.instance_size = type_query.instance_size;
  type_info.class_init = gst_v4l2_mtk_jpeg_dec_subclass_init;
  type_info.class_data = cdata;
  type_info.instance_init = gst_v4l2_mtk_jpeg_dec_subinstance_init;

  type_name = g_strdup_printf ("v4l2mtkjpegdec");
  subtype = g_type_register_static (type, type_name, &type_info, 0);

  gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype);

  g_free (type_name);

  return TRUE;
}