src/gstamlv4l2videodec.c

/* GStreamer
 * Copyright (C) 2022 <xuesong.jiang@amlogic.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 Street, Suite 500,
 * Boston, MA 02110-1335, 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 "gstamlv4l2object.h"
#include "gstamlv4l2videodec.h"

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

GST_DEBUG_CATEGORY_STATIC(gst_aml_v4l2_video_dec_debug);
#define GST_CAT_DEFAULT gst_aml_v4l2_video_dec_debug
#define GST_AML_V4L2_CC_IMPORT_QUARK gst_aml_v4l2_buffer_pool_cc_import_quark ()

#ifndef ABSDIFF
#define ABSDIFF(a,b) (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
#endif

#if GST_IMPORT_LGE_PROP
typedef struct _GstAmlResourceInfo
{
    gchar *coretype;
    gint videoport;
    gint audioport;
    gint maxwidth;
    gint maxheight;
    gint mixerport;
} GstAmlResourceInfo;

struct _GstAmlV4l2VideoDecLgeCtxt
{
    GstAmlResourceInfo res_info;
    guint64 dec_size;
    guint64 undec_size;
    gchar *app_type;
    gboolean clip_mode;
};
#endif

typedef struct
{
  gchar *device;
  GstCaps *sink_caps;
  GstCaps *src_caps;
  const gchar *longname;
  const gchar *description;
} GstAmlV4l2VideoDecCData;

enum
{
  PROP_0,
  V4L2_STD_OBJECT_PROPS,
#if GST_IMPORT_LGE_PROP
  LGE_RESOURCE_INFO,
  LGE_DECODE_SIZE,
  LGE_UNDECODE_SIZE,
  LGE_APP_TYPE,
  LGE_CLIP_MODE
#endif
};

enum
{
  SIGNAL_DECODED_PTS,
  SIGNAL_DECODED_ERROR_PTS,
  MAX_SIGNAL
};

static guint g_signals[MAX_SIGNAL]= {0};

#define gst_aml_v4l2_video_dec_parent_class parent_class
G_DEFINE_ABSTRACT_TYPE(GstAmlV4l2VideoDec, gst_aml_v4l2_video_dec,
    GST_AML_TYPE_VIDEO_DECODER);

static GstFlowReturn gst_aml_v4l2_video_dec_finish(GstAmlVideoDecoder *decoder);
#if GST_IMPORT_LGE_PROP
static void gst_aml_v4l2_video_dec_install_lge_properties_helper(GObjectClass *gobject_class);
#endif
static GstClockTime gst_aml_v4l2_video_dec_calc_output_buffer_pts(GstAmlVideoDecoder *decoder);
static GstClockTime gst_aml_v4l2_video_dec_calc_duration(GstAmlVideoDecoder *decoder);

static void
gst_aml_v4l2_video_dec_set_property(GObject *object,
    guint prop_id, const GValue * value, GParamSpec * pspec)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(object);

  switch (prop_id)
  {
    case PROP_CAPTURE_IO_MODE:
    case PROP_DUMP_FRAME_LOCATION:
    case PROP_CC_DATA:
      if (!gst_aml_v4l2_object_set_property_helper(self->v4l2capture,
                                                   prop_id, value, pspec))
      {
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      }
      break;
#if GST_IMPORT_LGE_PROP
  case LGE_RESOURCE_INFO:
  {
      GST_DEBUG_OBJECT(self, "LGE up layer set res info");
      GstStructure *r_info = g_value_get_object(value);
      if (r_info)
      {
          if (gst_structure_has_field(r_info, "coretype"))
          {
              if (self->lge_ctxt->res_info.coretype)
                  g_free(self->lge_ctxt->res_info.coretype);
              self->lge_ctxt->res_info.coretype = g_strdup(gst_structure_get_string(r_info, "coretype"));
          }
          if (gst_structure_has_field(r_info, "videoport"))
              gst_structure_get_int(r_info, "videoport", &(self->lge_ctxt->res_info.videoport));
          if (gst_structure_has_field(r_info, "audioport"))
              gst_structure_get_int(r_info, "audioport", &(self->lge_ctxt->res_info.audioport));
          if (gst_structure_has_field(r_info, "maxwidth"))
              gst_structure_get_int(r_info, "maxwidth", &(self->lge_ctxt->res_info.maxwidth));
          if (gst_structure_has_field(r_info, "maxheight"))
              gst_structure_get_int(r_info, "maxheight", &(self->lge_ctxt->res_info.maxheight));
          if (gst_structure_has_field(r_info, "mixerport"))
              gst_structure_get_int(r_info, "mixerport", &(self->lge_ctxt->res_info.mixerport));
      }
      break;
  }
  case LGE_APP_TYPE:
  {
      GST_DEBUG_OBJECT(self, "LGE up layer set app type");
      if (self->lge_ctxt->app_type)
          g_free(self->lge_ctxt->app_type);
      self->lge_ctxt->app_type = g_strdup(g_value_get_string(value));
      break;
  }
  case LGE_CLIP_MODE:
  {
      GST_DEBUG_OBJECT(self, "LGE up layer set clip mode");
      self->lge_ctxt->clip_mode = g_strdup(g_value_get_boolean(value));
      break;
  }
#endif
      /* By default, only set on output */
    default:
      if (!gst_aml_v4l2_object_set_property_helper (self->v4l2output,
              prop_id, value, pspec))
      {
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      }
      break;
  }
}

static void
gst_aml_v4l2_video_dec_get_property(GObject *object,
                                    guint prop_id, GValue *value, GParamSpec *pspec)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(object);

  switch (prop_id)
  {
    case PROP_CAPTURE_IO_MODE:
    case PROP_CC_DATA:
    case PROP_DECODING_ERROR_FRAMES:
      if (!gst_aml_v4l2_object_get_property_helper (self->v4l2capture,
              prop_id, value, pspec))
      {
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      }
      break;
#if GST_IMPORT_LGE_PROP
    case LGE_DECODE_SIZE:
    {
      GST_DEBUG_OBJECT(self, "LGE up layer get dec size");
      self->lge_ctxt->dec_size = -1;
      g_value_set_int(value, self->lge_ctxt->dec_size);
      break;
    }
    case LGE_UNDECODE_SIZE:
    {
      GST_DEBUG_OBJECT(self, "LGE up layer get undec size");
      self->lge_ctxt->undec_size = -1;
      g_value_set_int(value, self->lge_ctxt->undec_size);
      break;
    }
#endif

      /* By default read from output */
  default:
    if (!gst_aml_v4l2_object_get_property_helper (self->v4l2output,
            prop_id, value, pspec))
    {
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
    }
    break;
  }
}

static gboolean
gst_aml_v4l2_video_dec_open(GstAmlVideoDecoder *decoder)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);
  GstCaps *codec_caps;

  GST_DEBUG_OBJECT (self, "Opening");

  if (!gst_aml_v4l2_object_open (self->v4l2output))
    goto failure;

  if (!gst_aml_v4l2_object_open_shared (self->v4l2capture, self->v4l2output))
    goto failure;

  codec_caps = gst_pad_get_pad_template_caps (decoder->sinkpad);
  self->probed_sinkcaps = gst_aml_v4l2_object_probe_caps (self->v4l2output,
      codec_caps);
  gst_caps_unref (codec_caps);

  if (gst_caps_is_empty (self->probed_sinkcaps))
    goto no_encoded_format;

  return TRUE;

no_encoded_format:
  GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
      (_("Decoder on device %s has no supported input format"),
          self->v4l2output->videodev), (NULL));
  goto failure;

failure:
  if (GST_AML_V4L2_IS_OPEN (self->v4l2output))
    gst_aml_v4l2_object_close (self->v4l2output);

  if (GST_AML_V4L2_IS_OPEN (self->v4l2capture))
    gst_aml_v4l2_object_close (self->v4l2capture);

  gst_caps_replace (&self->probed_srccaps, NULL);
  gst_caps_replace (&self->probed_sinkcaps, NULL);

  return FALSE;
}

static gboolean
gst_aml_v4l2_video_dec_close(GstAmlVideoDecoder *decoder)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);

  GST_DEBUG_OBJECT (self, "Closing");

  gst_aml_v4l2_object_close(self->v4l2output);
  gst_aml_v4l2_object_close(self->v4l2capture);
  gst_caps_replace (&self->probed_srccaps, NULL);
  gst_caps_replace (&self->probed_sinkcaps, NULL);

  return TRUE;
}

static gboolean
gst_aml_v4l2_video_dec_start(GstAmlVideoDecoder *decoder)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);

  GST_DEBUG_OBJECT (self, "Starting");

  gst_aml_v4l2_object_flush_start (self->v4l2output);
  g_atomic_int_set (&self->active, TRUE);
  self->output_flow = GST_FLOW_OK;

  return TRUE;
}

static gboolean
gst_aml_v4l2_video_dec_stop(GstAmlVideoDecoder *decoder)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);

  GST_DEBUG_OBJECT (self, "Stopping");

  gst_aml_v4l2_object_flush_start (self->v4l2output);
  gst_aml_v4l2_object_flush_start (self->v4l2capture);

  /* Wait for capture thread to stop */
  gst_pad_stop_task (decoder->srcpad);

  GST_AML_VIDEO_DECODER_STREAM_LOCK(decoder);
  self->output_flow = GST_FLOW_OK;
  GST_AML_VIDEO_DECODER_STREAM_UNLOCK(decoder);

  /* Should have been flushed already */
  g_assert (g_atomic_int_get (&self->active) == FALSE);

  gst_aml_v4l2_object_stop(self->v4l2output);
  gst_aml_v4l2_object_stop(self->v4l2capture);

  if (self->input_state)
  {
    gst_aml_video_codec_state_unref(self->input_state);
    self->input_state = NULL;
  }

  GST_DEBUG_OBJECT (self, "Stopped");

  return TRUE;
}

static gboolean
gst_aml_v4l2_video_dec_codec_chg(GstAmlVideoDecoder *decoder,
                                  GstAmlVideoCodecState *state)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);
  GstStructure *s_old = NULL;
  GstStructure *s_new = NULL;

  // first play, must set foramt;
  if (!self->input_state)
    return TRUE;

  if (self->input_state->caps)
    s_old = gst_caps_get_structure(self->input_state->caps,0);
  if (state->caps)
    s_new = gst_caps_get_structure(state->caps,0);

  if (s_new && s_old && strcmp(gst_structure_get_name(s_new),gst_structure_get_name(s_old)))
    return TRUE;
  return FALSE;
}

static gboolean
gst_aml_v4l2_video_dec_res_chg(GstAmlVideoDecoder *decoder,
                                  GstAmlVideoCodecState *state)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);
  gboolean ret = FALSE;
  gint width_new = -1,height_new = -1,width_old = -1,height_old = -1;
  GstStructure *s_old = NULL;
  GstStructure *s_new = NULL;

  // first play, must set foramt;
  if (!self->input_state)
  {
    ret = TRUE;
    goto done;
  }

  if (self->input_state->caps)
    s_old = gst_caps_get_structure(self->input_state->caps,0);
  if (state->caps)
    s_new = gst_caps_get_structure(state->caps,0);

  if (s_new && gst_structure_has_field(s_new,"width") && gst_structure_has_field(s_new,"height"))
  {
    gst_structure_get_int(s_new,"width",&width_new);
    gst_structure_get_int(s_new,"height",&height_new);
  }
  if (s_old && gst_structure_has_field(s_old,"width") && gst_structure_has_field(s_old,"height"))
  {
    gst_structure_get_int(s_old,"width",&width_old);
    gst_structure_get_int(s_old,"height",&height_old);
  }

  if (width_new != width_old || height_new != height_old)
    ret = TRUE;

done:
  GST_DEBUG_OBJECT(self, "ret is %d",ret);
  return ret;
}

static gboolean
gst_aml_v4l2_video_dec_set_format(GstAmlVideoDecoder *decoder,
                                  GstAmlVideoCodecState *state)
{
  GstAmlV4l2Error error = GST_AML_V4L2_ERROR_INIT;
  gboolean ret = TRUE;
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);
  GstCaps *caps;

  GST_DEBUG_OBJECT (self, "Setting format: %" GST_PTR_FORMAT, state->caps);
  if (self->input_state)
  {
    if (gst_aml_v4l2_video_dec_res_chg(decoder,state) || gst_aml_v4l2_video_dec_codec_chg(decoder,state))
      GST_DEBUG_OBJECT(self, "resolution or codec changed");
    else
      goto done;
  }

  GstCapsFeatures *const features = gst_caps_get_features(state->caps, 0);
  GstStructure *s = gst_caps_get_structure(state->caps,0);
  if (s && gst_structure_has_field(s,"format"))
  {
    if (!strcmp("XVID",gst_structure_get_string(s,"format")))
    {
      GST_DEBUG_OBJECT(self, "This is a DIVX file, cannot support");
      ret = FALSE;
      goto done;
    }
  }

  if (gst_caps_features_contains(features, GST_CAPS_FEATURE_MEMORY_DMABUF))
      self->v4l2output->req_mode = GST_V4L2_IO_DMABUF_IMPORT;

  if (self->input_state)
  {
    if (gst_aml_v4l2_object_caps_equal(self->v4l2output, state->caps))
    {
      GST_DEBUG_OBJECT (self, "Compatible caps");
      goto done;
    }

    gst_aml_v4l2_video_dec_finish (decoder);
    gst_aml_v4l2_object_stop (self->v4l2output);

    gst_aml_video_codec_state_unref(self->input_state);
    self->input_state = NULL;

    /* The renegotiation flow don't blend with the base class flow. To properly
     * stop the capture pool, if the buffers can't be orphaned, we need to
     * reclaim our buffers, which will happend through the allocation query.
     * The allocation query is triggered by gst_aml_video_decoder_negotiate() which
     * requires the output caps to be set, but we can't know this information
     * as we rely on the decoder, which requires the capture queue to be
     * stopped.
     *
     * To workaround this issue, we simply run an allocation query with the
     * old negotiated caps in order to drain/reclaim our buffers. That breaks
     * the complexity and should not have much impact in performance since the
     * following allocation query will happen on a drained pipeline and won't
     * block. */
    if (self->v4l2capture->pool &&
        !gst_aml_v4l2_buffer_pool_orphan(&self->v4l2capture->pool))
    {
      GstCaps *caps = gst_pad_get_current_caps (decoder->srcpad);
      if (caps)
      {
        GstQuery *query = gst_query_new_allocation (caps, FALSE);
        gst_pad_peer_query (decoder->srcpad, query);
        gst_query_unref (query);
        gst_caps_unref (caps);
      }
    }

    gst_aml_v4l2_object_stop (self->v4l2capture);
    self->output_flow = GST_FLOW_OK;
  }
  if ((ret = gst_aml_v4l2_set_drm_mode(self->v4l2output)) == FALSE)
  {
      GST_ERROR_OBJECT(self, "config output drm mode error");
      goto done;
  }

  if ((ret = gst_aml_v4l2_set_stream_mode(self->v4l2output)) == FALSE)
  {
      GST_ERROR_OBJECT(self, "config output stream mode error");
      goto done;
  }

  if (!gst_aml_v4l2_object_set_format (self->v4l2output, state->caps, &error))
  {
      GST_ERROR_OBJECT(self, "set format error");
      goto done;
  }

  // MUST: aml v4l2 drive request set I frame after VIDIOC_S_FMT.
  if ((ret = gst_aml_v4l2_set_I_frame_mode(self->v4l2output)) == FALSE)
  {
      GST_ERROR_OBJECT(self, "config I frame mode error");
      goto done;
  }

  gst_caps_replace (&self->probed_srccaps, NULL);
  self->probed_srccaps = gst_aml_v4l2_object_probe_caps (self->v4l2capture,
      gst_aml_v4l2_object_get_raw_caps ());

  if (gst_caps_is_empty (self->probed_srccaps))
    goto no_raw_format;

  caps = gst_caps_copy(self->probed_srccaps);
  gst_caps_set_features_simple(caps, gst_caps_features_from_string(GST_CAPS_FEATURE_MEMORY_DMABUF));
  gst_caps_append(self->probed_srccaps, caps);
  if (ret)
    self->input_state = gst_aml_video_codec_state_ref (state);
  else
    gst_aml_v4l2_error (self, &error);

done:
  return ret;

no_raw_format:
  GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
      (_("Decoder on device %s has no supported output format"),
          self->v4l2output->videodev), (NULL));
  return GST_FLOW_ERROR;
}

static gboolean
gst_aml_v4l2_video_dec_flush(GstAmlVideoDecoder *decoder)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);

  GST_DEBUG_OBJECT(self, "Flushed");

  /* Ensure the processing thread has stopped for the reverse playback
   * discount case */
  if (gst_pad_get_task_state (decoder->srcpad) == GST_TASK_STARTED)
  {
    GST_AML_VIDEO_DECODER_STREAM_UNLOCK (decoder);

    gst_aml_v4l2_object_flush_start (self->v4l2output);
    gst_aml_v4l2_object_flush_start (self->v4l2capture);
    gst_pad_stop_task (decoder->srcpad);
    GST_AML_VIDEO_DECODER_STREAM_LOCK (decoder);
  }

  self->output_flow = GST_FLOW_OK;

  gst_aml_v4l2_object_flush_stop (self->v4l2output);
  gst_aml_v4l2_object_flush_stop (self->v4l2capture);

  if (self->v4l2output->pool)
    gst_aml_v4l2_buffer_pool_flush (self->v4l2output->pool);

  /* gst_aml_v4l2_buffer_pool_flush() calls streamon the capture pool and must be
   * called after gst_aml_v4l2_object_flush_stop() stopped flushing the buffer
   * pool. */
  if (self->v4l2capture->pool)
    gst_aml_v4l2_buffer_pool_flush (self->v4l2capture->pool);

  return TRUE;
}

static gboolean
gst_aml_v4l2_video_dec_negotiate(GstAmlVideoDecoder *decoder)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);

  if (TRUE == self->v4l2output->is_svp)
  {
    GstStructure *s;
    GstEvent *event;

    s = gst_structure_new_empty ("IS_SVP");
    event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM_STICKY, s);
    GST_DEBUG_OBJECT(self, "before Send SVP Event :%p", event);
    gst_pad_push_event (decoder->srcpad, event);
    GST_DEBUG_OBJECT(self, "after Send SVP Event :%p", event);
  }

  /* We don't allow renegotiation without carefull disabling the pool */
  if (self->v4l2capture->pool &&
    gst_buffer_pool_is_active(GST_BUFFER_POOL(self->v4l2capture->pool)))
    return TRUE;

  return GST_AML_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder);
}

static gboolean
gst_aml_v4l2_decoder_cmd(GstAmlV4l2Object *v4l2object, guint cmd, guint flags)
{
  struct v4l2_decoder_cmd dcmd = { 0, };

  GST_DEBUG_OBJECT (v4l2object->element,
      "sending v4l2 decoder command %u with flags %u", cmd, flags);

  if (!GST_AML_V4L2_IS_OPEN (v4l2object))
    return FALSE;

  dcmd.cmd = cmd;
  dcmd.flags = flags;
  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_DECODER_CMD, &dcmd) < 0)
    goto dcmd_failed;

  return TRUE;

dcmd_failed:
  if (errno == ENOTTY)
  {
    GST_INFO_OBJECT (v4l2object->element,
        "Failed to send decoder command %u with flags %u for '%s'. (%s)",
        cmd, flags, v4l2object->videodev, g_strerror (errno));
  }
  else
  {
    GST_ERROR_OBJECT (v4l2object->element,
        "Failed to send decoder command %u with flags %u for '%s'. (%s)",
        cmd, flags, v4l2object->videodev, g_strerror (errno));
  }
  return FALSE;
}

static GstFlowReturn
gst_aml_v4l2_video_dec_finish(GstAmlVideoDecoder *decoder)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC (decoder);
  GstFlowReturn ret = GST_FLOW_OK;
  GstBuffer *buffer;

  if (gst_pad_get_task_state (decoder->srcpad) != GST_TASK_STARTED)
    goto done;

  GST_DEBUG_OBJECT (self, "Finishing decoding");

  GST_AML_VIDEO_DECODER_STREAM_UNLOCK (decoder);

  if (gst_aml_v4l2_decoder_cmd (self->v4l2output, V4L2_DEC_CMD_STOP, 0))
  {
      GstTask *task = decoder->srcpad->task;

      /* If the decoder stop command succeeded, just wait until processing is
       * finished */
      GST_DEBUG_OBJECT (self, "Waiting for decoder stop");
      GST_OBJECT_LOCK (task);
      while (GST_TASK_STATE (task) == GST_TASK_STARTED)
        GST_TASK_WAIT (task);
      GST_OBJECT_UNLOCK (task);

      ret = GST_FLOW_FLUSHING;
  }
  else
  {
    /* otherwise keep queuing empty buffers until the processing thread has
     * stopped, _pool_process() will return FLUSHING when that happened */
    while (ret == GST_FLOW_OK)
    {
      GST_DEBUG_OBJECT(self, "queue empty output buf");
      buffer = gst_buffer_new ();
      ret =
          gst_aml_v4l2_buffer_pool_process(GST_AML_V4L2_BUFFER_POOL(self->v4l2output->pool), &buffer);
      gst_buffer_unref (buffer);
    }
  }

  /* and ensure the processing thread has stopped in case another error
   * occurred. */
  gst_aml_v4l2_object_flush_start (self->v4l2capture);
  gst_pad_stop_task (decoder->srcpad);
  GST_AML_VIDEO_DECODER_STREAM_LOCK (decoder);

  if (ret == GST_FLOW_FLUSHING)
    ret = self->output_flow;

  /*if V4L2_DEC_CMD_STOP called,indicate decoder will stop.
  should reset need_wait_event=true to wait source change event*/
  self->v4l2capture->need_wait_event = TRUE;
  GST_DEBUG_OBJECT (decoder, "Done draining buffers");

  /* TODO Shall we cleanup any reffed frame to workaround broken decoders ? */

done:
  return ret;
}

static GstFlowReturn
gst_aml_v4l2_video_dec_drain(GstAmlVideoDecoder *decoder)
{
    GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);

  GST_DEBUG_OBJECT (self, "Draining...");
  gst_aml_v4l2_video_dec_finish (decoder);
  gst_aml_v4l2_video_dec_flush (decoder);

  return GST_FLOW_OK;
}

static GstAmlVideoCodecFrame *
gst_aml_v4l2_video_dec_get_right_frame_for_frame_mode(GstAmlVideoDecoder *decoder, GstClockTime pts)
{
  GstAmlVideoCodecFrame *frame = NULL;
  GList *frames, *l;
  gint count = 0;

  GST_LOG_OBJECT (decoder, "trace in with pts: %" GST_TIME_FORMAT, GST_TIME_ARGS(pts));

  frames = gst_aml_video_decoder_get_frames(decoder);

  for (l = frames; l != NULL; l = l->next)
  {
      GstAmlVideoCodecFrame *f = l->data;

      if (GST_CLOCK_TIME_IS_VALID(pts) && (ABSDIFF(f->pts,pts)) < 1000) {
          frame = f;
      }
      count++;
  }

  if (!frame)
  {
      for (l = frames; l != NULL; l = l->next)
      {
          GstAmlVideoCodecFrame *f = l->data;
          if (!GST_CLOCK_TIME_IS_VALID(f->pts))
          {
              frame = f;
              GST_DEBUG("The pts of the expected output frame is invalid");
              break;
          }
      }
  }

  if (frame)
  {
      GST_LOG_OBJECT(decoder,
                     "frame %p is %d %" GST_TIME_FORMAT " and %d frames left",
                     frame, frame->system_frame_number, GST_TIME_ARGS(frame->pts), count - 1);
      gst_aml_video_codec_frame_ref(frame);
  }
  else
  {
      GST_LOG_OBJECT(decoder,
                     "buffer %" GST_TIME_FORMAT " unmatch, create new frame", GST_TIME_ARGS(pts));
      frame = gst_aml_video_decoder_v4l2_new_frame (decoder);
  }

  g_list_free_full(frames, (GDestroyNotify)gst_aml_video_codec_frame_unref);

  return frame;
}

static GstAmlVideoCodecFrame *
gst_aml_v4l2_video_dec_get_right_frame_for_stream_mode(GstAmlVideoDecoder *decoder, GstClockTime pts)
{
  GstAmlVideoCodecFrame *frame = NULL;
  GList *frames, *l;
  guint frames_len = 0;
  GST_LOG_OBJECT (decoder, "trace in with pts: %" GST_TIME_FORMAT, GST_TIME_ARGS(pts));

  if (!(frames = gst_aml_video_decoder_get_frames(decoder)))
      goto done;

  frames_len = g_list_length(frames);
  GST_LOG_OBJECT (decoder, "got frames list len:%d", frames_len);

  for (l = frames; l != NULL; l = l->next)
  {
      GstAmlVideoCodecFrame *f = l->data;

      if (GST_CLOCK_TIME_IS_VALID(pts) && (ABSDIFF(f->pts, pts)) < 1000)
      {
          /* found the right frame */
          GST_LOG_OBJECT(decoder,
              "found frame %" GST_TIME_FORMAT "with pts %" GST_TIME_FORMAT,
              GST_TIME_ARGS(f->pts), GST_TIME_ARGS(pts));
          frame = f;
          break;
      }
      else if(GST_CLOCK_TIME_IS_VALID(pts) && (f->pts < pts))
      {
          GST_LOG_OBJECT(decoder,
              "stream mode drop frame %d %" GST_TIME_FORMAT,
              f->system_frame_number, GST_TIME_ARGS(f->pts));

          gst_aml_video_codec_frame_ref(f);
          // gst_aml_video_decoder_drop_frame(decoder, f);
          gst_aml_video_decoder_release_frame(decoder, f);
      }
      else
      {
          GST_LOG_OBJECT (decoder, "dbg");
      }
  }

  if (frame)
  {
      guint l_len = 0;
      l = gst_aml_video_decoder_get_frames(decoder);
      l_len = g_list_length(l);
      g_list_free_full(l, (GDestroyNotify)gst_aml_video_codec_frame_unref);

      GST_LOG_OBJECT(decoder,
                     "frame %p is %d %" GST_TIME_FORMAT " and %d frames left",
                     frame, frame->system_frame_number, GST_TIME_ARGS(frame->pts), l_len);
      gst_aml_video_codec_frame_ref(frame);
  }

  g_list_free_full(frames, (GDestroyNotify)gst_aml_video_codec_frame_unref);

done:
  return frame;
}

static GstAmlVideoCodecFrame *
gst_aml_v4l2_video_dec_get_right_frame(GstAmlVideoDecoder *decoder, GstClockTime pts)
{
  GstAmlV4l2VideoDec *self = (GstAmlV4l2VideoDec *)decoder;
  if (self->v4l2output->stream_mode)
    return gst_aml_v4l2_video_dec_get_right_frame_for_stream_mode(decoder, pts);
  else
    return gst_aml_v4l2_video_dec_get_right_frame_for_frame_mode(decoder, pts);
}

static gboolean
gst_aml_v4l2_video_remove_padding(GstCapsFeatures *features,
                                  GstStructure *structure, gpointer user_data)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(user_data);
  GstVideoAlignment *align = &self->v4l2capture->align;
  GstVideoInfo *info = &self->v4l2capture->info;
  int width, height;

  if (!gst_structure_get_int(structure, "width", &width))
      return TRUE;

  if (!gst_structure_get_int(structure, "height", &height))
      return TRUE;

  if (align->padding_left != 0 || align->padding_top != 0 ||
      height != info->height + align->padding_bottom)
      return TRUE;

  if (height == info->height + align->padding_bottom)
  {
    /* Some drivers may round up width to the padded with */
    if (width == info->width + align->padding_right)
        gst_structure_set(structure,
                          "width", G_TYPE_INT, width - align->padding_right,
                          "height", G_TYPE_INT, height - align->padding_bottom, NULL);
    /* Some drivers may keep visible width and only round up bytesperline */
    else if (width == info->width)
        gst_structure_set(structure,
                          "height", G_TYPE_INT, height - align->padding_bottom, NULL);
  }

  return TRUE;
}

static void
gst_v4l2_drop_event (GstAmlV4l2Object * v4l2object)
{
  struct v4l2_event evt;
  gint ret;

  memset (&evt, 0x00, sizeof (struct v4l2_event));
  ret = v4l2object->ioctl (v4l2object->video_fd, VIDIOC_DQEVENT, &evt);
  if (ret < 0)
  {
    GST_DEBUG_OBJECT (v4l2object, "dqevent failed");
    return;
  }

  switch (evt.type)
  {
    case V4L2_EVENT_SOURCE_CHANGE:
      GST_DEBUG_OBJECT (v4l2object, "Drop GST_V4L2_FLOW_SOURCE_CHANGE");
      break;
    case V4L2_EVENT_EOS:
      GST_DEBUG_OBJECT (v4l2object, "Drop GST_V4L2_FLOW_LAST_BUFFER");
      break;
    default:
      break;
  }

  return;
}

static void
gst_aml_v4l2_video_dec_set_output_status(GstAmlVideoDecoder *decoder,GstVideoInfo info)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);
  GstAmlVideoCodecState *output_state;
  struct v4l2_selection sel;
  struct v4l2_rect *r = NULL;
  GstStructure *s;
  gint width = 0;
  gint height = 0;
  GST_DEBUG("%d   %d",info.width, info.height);
  output_state = gst_aml_video_decoder_set_output_state(decoder,
                 info.finfo->format, info.width, info.height, self->input_state);
  memset(&sel, 0, sizeof(struct v4l2_selection));
  sel.type = self->v4l2capture->type;
  sel.target = V4L2_SEL_TGT_COMPOSE_DEFAULT;
  if (self->v4l2capture->ioctl(self->v4l2capture->video_fd, VIDIOC_G_SELECTION, &sel) >= 0)
  {
    r = &sel.r;
    width = (r->width/2)*2;
    height = (r->height/2)*2;
    GST_DEBUG_OBJECT(self, "w:%d  h:%d  ",width,height);
  }
  else
      GST_DEBUG_OBJECT(self, "iotcl error");
  if (output_state)
  {
    output_state->info.interlace_mode = info.interlace_mode;
    output_state->allocation_caps =gst_video_info_to_caps(&info);
    output_state->caps =gst_video_info_to_caps(&info);
    s = gst_caps_get_structure(output_state->caps, 0);
    if (s)
    {
      gst_structure_set(s,"src_width",G_TYPE_INT,width,NULL);
      gst_structure_set(s,"src_height",G_TYPE_INT,height,NULL);
      gst_structure_set(s,"width",G_TYPE_INT,info.width,NULL);
      gst_structure_set(s,"height",G_TYPE_INT,info.height,NULL);
      GST_DEBUG_OBJECT(self, "output_state->caps: %" GST_PTR_FORMAT, output_state->caps);
      gst_aml_video_codec_state_unref(output_state);
    }
  }
}

static GQuark
gst_aml_v4l2_buffer_pool_cc_import_quark (void)
{
  static GQuark quark = 0;

  if (quark == 0)
    quark = g_quark_from_string ("GstAmlV4l2BufferPoolCcUsePtrData");

  return quark;
}

static gboolean
foreach_cc_buffer_list_match_pts_func(GList *list , GstAmlVideoCodecFrame *frame)
{
  GList *l;
  if (g_list_length (list) > 0)
  {
    for (l = list; l != NULL; l = l->next)
    {
      GstBuffer *cc_buffer = l->data;
      if (GST_BUFFER_TIMESTAMP (frame->output_buffer) == GST_BUFFER_TIMESTAMP (cc_buffer))
      {
        gst_mini_object_set_qdata (GST_MINI_OBJECT (frame->output_buffer), GST_AML_V4L2_CC_IMPORT_QUARK,
            gst_buffer_ref(cc_buffer), (GDestroyNotify) gst_buffer_unref);
        #if 0
        //Debug code:dump cc data
        GstMapInfo gst_map;
        gst_buffer_map(cc_buffer,&gst_map,GST_MAP_READ);
        int fd=open("/data/test/cc1.data",O_RDWR |O_CREAT|O_APPEND,0777);
        if (gst_map.size>0)
          write(fd,gst_map.data,gst_map.size);
        close(fd);
        gst_buffer_unmap(cc_buffer,&gst_map);
        #endif
        GST_DEBUG("match success");
        return TRUE;
      }
      else
      {
        GST_DEBUG("match fail");
      }
    }
    GST_WARNING("no match frame in the bufferlist");
  }
  else
  {
      GST_WARNING("list is null,can not foreach");
  }
  return FALSE;
}

static GstClockTime
gst_aml_v4l2_video_dec_calc_output_buffer_pts(GstAmlVideoDecoder *decoder)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);
  GstClockTime pts = GST_CLOCK_TIME_NONE;

  if (GST_CLOCK_TIME_IS_VALID (self->last_out_pts) && GST_CLOCK_TIME_IS_VALID(self->frame_duration)) {
      pts = self->last_out_pts + self->frame_duration;
      GST_LOG_OBJECT (decoder,
          "calculate PTS %" GST_TIME_FORMAT " by duration: %" GST_TIME_FORMAT,
          GST_TIME_ARGS (pts), GST_TIME_ARGS (self->frame_duration));
  }
  else
  {
    pts = 0;
    GST_INFO_OBJECT (decoder,"Set PTS=0");
  }
  return pts;
}

static GstClockTime
gst_aml_v4l2_video_dec_calc_duration(GstAmlVideoDecoder *decoder)
{
    GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);
    GstClockTime duration = GST_CLOCK_TIME_NONE;
    gint fps_n, fps_d;
    fps_n = gst_value_get_fraction_numerator(self->v4l2capture->fps);
    fps_d = gst_value_get_fraction_denominator(self->v4l2capture->fps);

    if (fps_n != 0 && fps_d != 0)
    {
        duration = gst_util_uint64_scale (GST_SECOND, fps_d, fps_n);

        if (self->v4l2capture->info.interlace_mode == GST_VIDEO_INTERLACE_MODE_INTERLEAVED)
        {
            duration = duration / 2;
        }
    }

    GST_INFO_OBJECT (decoder,"framerate(fps_d: %d, fps_n: %d) -> frame_duration = %" GST_TIME_FORMAT, fps_d, fps_n, GST_TIME_ARGS(duration));

    return duration;
}

static void
gst_aml_v4l2_video_dec_loop(GstAmlVideoDecoder *decoder)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);
  GstAmlV4l2BufferPool *v4l2_pool;
  GstAmlV4l2Error error = GST_AML_V4L2_ERROR_INIT;
  GstBufferPool *pool;
  GstAmlVideoCodecFrame *frame;
  GstBuffer *buffer = NULL;
  GstFlowReturn ret;

  if (G_UNLIKELY (!GST_AML_V4L2_IS_ACTIVE (self->v4l2capture)))
  {
    GstVideoInfo info;
    GstCaps *acquired_caps, *available_caps, *caps, *filter;
    GstStructure *st;
    GST_DEBUG_OBJECT(self, "waitting source change event");
    /* Wait until received SOURCE_CHANGE event to get right video format */
    while (self->v4l2capture->can_wait_event && self->v4l2capture->need_wait_event)
    {
      ret = gst_aml_v4l2_object_dqevent (self->v4l2capture);
      if (ret == GST_AML_V4L2_FLOW_SOURCE_CHANGE)
      {
        //let flush start event blocked until capture buffer pool actived
        self->is_res_chg = TRUE;
        GST_DEBUG_OBJECT (self, "Received source change event");
        break;
      }
      else if (ret == GST_AML_V4L2_FLOW_LAST_BUFFER)
      {
         GST_DEBUG_OBJECT (self, "Received eos event");
         goto beach;
      }
      else if (ret != GST_FLOW_OK)
      {
         GST_ERROR_OBJECT (self, "dqevent error");
         goto beach;
      }
    }
    self->v4l2capture->need_wait_event = FALSE;

    if (TRUE == self->v4l2output->is_svp)
    {
      GstPad *peer;
      GstStructure *s;
      GstEvent *event;

      peer = gst_pad_get_peer (decoder->srcpad);
      if (peer)
      {
        s = gst_structure_new_empty ("IS_SVP");
        if (s)
        {
          event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM, s);
          gst_pad_send_event (peer, event);
          GST_DEBUG_OBJECT(self, "Send SVP Event");
        }
        gst_object_unref (peer);
      }
    }

    if (self->v4l2capture->need_drop_event)
    {
      // drop V4L2_EVENT_SOURCE_CHANGE
      gst_v4l2_drop_event(self->v4l2capture);
      self->v4l2capture->need_drop_event = FALSE;
    }

    if (!gst_aml_v4l2_object_acquire_format (self->v4l2capture, &info))
      goto not_negotiated;

    /* Create caps from the acquired format, remove the format field */
    acquired_caps = gst_video_info_to_caps (&info);
    GST_DEBUG_OBJECT (self, "Acquired caps: %" GST_PTR_FORMAT, acquired_caps);
    st = gst_caps_get_structure (acquired_caps, 0);
    gst_structure_remove_fields (st, "format", "colorimetry", "chroma-site", NULL);

    /* Probe currently available pixel formats */
   available_caps = gst_caps_copy (self->probed_srccaps);
    GST_DEBUG_OBJECT (self, "Available caps: %" GST_PTR_FORMAT, available_caps);

    /* Replace coded size with visible size, we want to negotiate visible size
  * with downstream, not coded size. */
    gst_caps_map_in_place (available_caps, gst_aml_v4l2_video_remove_padding, self);

    filter = gst_caps_intersect_full (available_caps, acquired_caps, GST_CAPS_INTERSECT_FIRST);
    caps = gst_caps_copy(filter);
    gst_caps_set_features_simple(caps, gst_caps_features_from_string(GST_CAPS_FEATURE_MEMORY_DMABUF));
    gst_caps_append(filter, caps);

    GST_DEBUG_OBJECT (self, "Filtered caps: %" GST_PTR_FORMAT, filter);
    gst_caps_unref (acquired_caps);
    gst_caps_unref (available_caps);
    caps = gst_pad_peer_query_caps (decoder->srcpad, filter);
    gst_caps_unref (filter);

    GST_DEBUG_OBJECT (self, "Possible decoded caps: %" GST_PTR_FORMAT, caps);
    if (gst_caps_is_empty (caps))
    {
      gst_caps_unref (caps);
      goto not_negotiated;
    }

    /* Fixate pixel format */
    caps = gst_caps_fixate (caps);

    GST_DEBUG_OBJECT (self, "Chosen decoded caps: %" GST_PTR_FORMAT, caps);

    /* Try to set negotiated format, on success replace acquired format */
    if (gst_aml_v4l2_object_set_format (self->v4l2capture, caps, &error))
      gst_video_info_from_caps (&info, caps);
    else
      gst_aml_v4l2_clear_error (&error);
    gst_caps_unref (caps);
    gst_aml_v4l2_video_dec_set_output_status(decoder,info);
    if (!gst_aml_video_decoder_negotiate (decoder))
    {
      if (GST_PAD_IS_FLUSHING (decoder->srcpad))
        goto flushing;
      else
        goto not_negotiated;
    }

    /* Ensure our internal pool is activated */
    if (!gst_buffer_pool_set_active (GST_BUFFER_POOL (self->v4l2capture->pool),
         TRUE))
      goto activate_failed;

    //cal duration when got resolution event
    self->frame_duration = gst_aml_v4l2_video_dec_calc_duration(decoder);

    g_mutex_lock(&self->res_chg_lock);
    GST_LOG_OBJECT(decoder, "signal resolution changed");
    self->is_res_chg = FALSE;
    g_cond_signal(&self->res_chg_cond);
    g_mutex_unlock(&self->res_chg_lock);
  }

  GST_LOG_OBJECT (decoder, "Allocate output buffer");
  v4l2_pool = GST_AML_V4L2_BUFFER_POOL(self->v4l2capture->pool);

  self->output_flow = GST_FLOW_OK;
  do
  {
    /* We cannot use the base class allotate helper since it taking the internal
     * stream lock. we know that the acquire may need to poll until more frames
     * comes in and holding this lock would prevent that.
     */
    pool = gst_aml_video_decoder_get_buffer_pool (decoder);

    /* Pool may be NULL if we started going to READY state */
    if (pool == NULL)
    {
      GST_WARNING_OBJECT(decoder, "gst_aml_video_decoder_get_buffer_pool goto beach");
      ret = GST_FLOW_FLUSHING;
      goto beach;
    }

    ret = gst_buffer_pool_acquire_buffer (pool, &buffer, NULL);

    g_object_unref (pool);

    if (ret == GST_FLOW_OK && GST_BUFFER_FLAG_IS_SET(buffer,GST_AML_V4L2_BUFFER_FLAG_LAST_EMPTY)) {
      GST_LOG_OBJECT(decoder, "Get GST_AML_V4L2_FLOW_LAST_BUFFER");
      self->v4l2capture->need_drop_event = TRUE;
      gst_aml_v4l2_buffer_pool_process(v4l2_pool, &buffer);
      if (self->is_res_chg) {
        //we must release last buffer
        gst_buffer_unref(buffer);
        //if resolution changed event received,we should set need_drop_event to false
        self->v4l2capture->need_drop_event = FALSE;
        gst_aml_v4l2_object_stop(self->v4l2capture);
        //unblock flush start event
        g_mutex_lock(&self->res_chg_lock);
        self->is_res_chg = FALSE;
        g_cond_signal(&self->res_chg_cond);
        g_mutex_unlock(&self->res_chg_lock);
        return;
      } else {
          goto beach;
      }
    }

    if (ret == GST_AML_V4L2_FLOW_CC_DATA)
    {
       GST_DEBUG_OBJECT(decoder, "already got cc data, just continue.");
       continue;
    }

    if (ret == GST_AML_V4L2_FLOW_UNKNOWN_EVENT)
    {
       GST_DEBUG_OBJECT(decoder, "unknow event, just continue.");
       continue;
    }

    if (ret == GST_AML_V4L2_FLOW_SOURCE_CHANGE)
    {
      GST_LOG_OBJECT(decoder, "Get GST_AML_V4L2_FLOW_SOURCE_CHANGE");

      g_mutex_lock (&self->res_chg_lock);
      self->is_res_chg = TRUE;
      g_mutex_unlock (&self->res_chg_lock);
      return;
    }

    //decoding error happened
    if (ret == GST_AML_V4L2_FLOW_DECODING_ERROR)
    {
      GST_DEBUG("send error pts:%llu - %" GST_TIME_FORMAT, v4l2_pool->obj->error_frame_pts, GST_TIME_ARGS(v4l2_pool->obj->error_frame_pts));
      g_signal_emit (self, g_signals[SIGNAL_DECODED_ERROR_PTS], 0, v4l2_pool->obj->error_frame_pts, NULL);
      g_signal_emit (self, g_signals[SIGNAL_DECODED_PTS], 0, v4l2_pool->obj->error_frame_pts);
      continue;
    }

    if (ret != GST_FLOW_OK) {
        GST_WARNING_OBJECT(decoder, "gst_buffer_pool_acquire_buffer goto beach ret:%d",ret);
        goto beach;
    }

    GST_LOG_OBJECT(decoder, "Process output buffer (switching flow outstanding num:%d)", self->v4l2capture->outstanding_buf_num);
    ret = gst_aml_v4l2_buffer_pool_process(v4l2_pool, &buffer);

    GST_DEBUG_OBJECT(decoder, "decoded pts:%lld - %" GST_TIME_FORMAT, GST_BUFFER_PTS(buffer), GST_TIME_ARGS(GST_BUFFER_PTS(buffer)));
    g_signal_emit (self, g_signals[SIGNAL_DECODED_PTS], 0, GST_BUFFER_PTS(buffer));

    if (ret == GST_AML_V4L2_FLOW_SOURCE_CHANGE)
    {
      gst_aml_v4l2_object_stop (self->v4l2capture);
      return;
    }

  } while ((ret == GST_AML_V4L2_FLOW_CORRUPTED_BUFFER) ||
      (ret == GST_AML_V4L2_FLOW_CC_DATA) ||
      (ret == GST_AML_V4L2_FLOW_UNKNOWN_EVENT) ||
      (ret == GST_AML_V4L2_FLOW_DECODING_ERROR));

  if (ret != GST_FLOW_OK)
    goto beach;

  if (!GST_BUFFER_PTS_IS_VALID (buffer)
      || (GST_BUFFER_TIMESTAMP(buffer) == 0 && self->v4l2capture->info.interlace_mode == GST_VIDEO_INTERLACE_MODE_INTERLEAVED))
  {
      GST_BUFFER_TIMESTAMP(buffer) = gst_aml_v4l2_video_dec_calc_output_buffer_pts(decoder);
  }

  if (self->v4l2capture->info.interlace_mode == GST_VIDEO_INTERLACE_MODE_INTERLEAVED)
  {
    GST_BUFFER_DURATION(buffer) = self->frame_duration; // got at resolution event.
    GST_BUFFER_FLAG_UNSET(buffer, GST_VIDEO_BUFFER_FLAG_INTERLACED);
  }

  frame = gst_aml_v4l2_video_dec_get_right_frame(decoder, GST_BUFFER_TIMESTAMP (buffer));
  if (frame)
  {
    self->last_out_pts = GST_BUFFER_TIMESTAMP(buffer);
    frame->output_buffer = buffer;
    frame->pts = GST_BUFFER_TIMESTAMP(buffer);
    frame->duration = GST_BUFFER_DURATION(buffer);

    buffer = NULL;

    if (self->v4l2capture->enable_cc_data)
    {
      if (foreach_cc_buffer_list_match_pts_func(v4l2_pool->cc_buffer_list, frame))
      {
        GST_DEBUG("cc buffer and frame bind success");
        GstBuffer *cc_buffer = gst_mini_object_get_qdata (GST_MINI_OBJECT (frame->output_buffer),
          GST_AML_V4L2_CC_IMPORT_QUARK);
        #if 0
        //Debug code:dump cc data
        GstMapInfo gst_map;
        gst_buffer_map(cc_buffer,&gst_map,GST_MAP_READ);
        int fd=open("/data/test/cc2.data",O_RDWR |O_CREAT|O_APPEND,0777);
        if (gst_map.size>0)
           write(fd,gst_map.data,gst_map.size);
        close(fd);
        gst_buffer_unmap(cc_buffer,&gst_map);
        #endif
        v4l2_pool->cc_buffer_list = g_list_remove(v4l2_pool->cc_buffer_list,cc_buffer);
        gst_buffer_unref(cc_buffer);
      }
      else
      {
         GST_WARNING("bufferlist is empty or no match frame in the bufferlist");
      }
    }
    ret = gst_aml_video_decoder_finish_frame (decoder, frame);

    if (ret != GST_FLOW_OK)
      goto beach;
  }
  else
  {
    GST_WARNING_OBJECT(decoder, "Unmatch buffer, should be push, need refine");
    //gst_pad_push (decoder->srcpad, buffer);
    gst_buffer_unref (buffer);
  }

  return;
  /* ERRORS */
not_negotiated:
  {
    GST_ERROR_OBJECT (self, "not negotiated");
    ret = GST_FLOW_NOT_NEGOTIATED;
    goto beach;
  }
activate_failed:
  {
    GST_ERROR_OBJECT (self, "Buffer pool activation failed");
    GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
        (_("Failed to allocate required memory.")),
        ("Buffer pool activation failed"));
    ret = GST_FLOW_ERROR;
    goto beach;
  }
flushing:
  {
    ret = GST_FLOW_FLUSHING;
    goto beach;
  }
beach:
  GST_DEBUG_OBJECT (decoder, "Leaving output thread: %s",
      gst_flow_get_name (ret));
  if (self->is_res_chg) {
    //unblock flush start event
    g_mutex_lock(&self->res_chg_lock);
    self->is_res_chg = FALSE;
    g_cond_signal(&self->res_chg_cond);
    g_mutex_unlock(&self->res_chg_lock);
  }
  gst_buffer_replace (&buffer, NULL);
  self->output_flow = ret;
  gst_aml_v4l2_object_flush_start (self->v4l2output);
  gst_pad_pause_task (decoder->srcpad);
}

static GstFlowReturn
gst_aml_v4l2_video_dec_handle_frame (GstAmlVideoDecoder * decoder,
    GstAmlVideoCodecFrame * frame)
{
  GstAmlV4l2Error error = GST_AML_V4L2_ERROR_INIT;
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);
  GstBufferPool *pool = GST_BUFFER_POOL(self->v4l2output->pool);
  GstFlowReturn ret = GST_FLOW_OK;
  gboolean processed = FALSE;
  GstBuffer *tmp;
  GstTaskState task_state;

  GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);

  if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
    goto flushing;

  if (G_UNLIKELY(!GST_CLOCK_TIME_IS_VALID(self->frame_duration)))
    self->frame_duration = frame->duration;

  if (G_UNLIKELY (!GST_AML_V4L2_IS_ACTIVE (self->v4l2output)))
  {
    if (!self->input_state)
      goto not_negotiated;
    if (!gst_aml_v4l2_object_set_format (self->v4l2output, self->input_state->caps,
            &error))
      goto not_negotiated;
  }

  if (G_UNLIKELY (!GST_AML_V4L2_IS_ACTIVE (self->v4l2capture)))
  {
    GstBuffer *codec_data;
    GstCapsFeatures *features = NULL;

    features = gst_caps_get_features(self->input_state->caps, 0);
    if (features && gst_caps_features_contains(features, GST_CAPS_FEATURE_MEMORY_DMABUF) && self->v4l2output->secure_es)
    {
        GST_DEBUG_OBJECT(self, "Is SVP");
        //TODO:need rm is_svp flag and just using secure_es flag
        self->v4l2output->is_svp = TRUE;
    }

    GST_DEBUG_OBJECT (self, "Sending header");

    codec_data = self->input_state->codec_data;

    /* We are running in byte-stream mode, so we don't know the headers, but
     * we need to send something, otherwise the decoder will refuse to
     * initialize.
     */
    if (codec_data)
    {
      gst_buffer_ref (codec_data);
    }
    else
    {
      codec_data = gst_buffer_ref (frame->input_buffer);
      processed = TRUE;
    }

    /* Ensure input internal pool is active */
    if (!gst_buffer_pool_is_active (pool))
    {
      GstStructure *config = gst_buffer_pool_get_config (pool);
      // guint min = MAX(self->v4l2output->min_buffers, GST_AML_V4L2_MIN_BUFFERS);
      // guint max = VIDEO_MAX_FRAME;
      //      gst_buffer_pool_config_set_params (config, self->input_state->caps,
      //          self->v4l2output->info.size, min, max);
      gst_buffer_pool_config_set_params(config, self->input_state->caps, self->v4l2output->info.size, self->v4l2output->min_buffers, self->v4l2output->min_buffers);

      /* There is no reason to refuse this config */
      if (!gst_buffer_pool_set_config (pool, config))
        goto activate_failed;
      GST_DEBUG_OBJECT(self, "setting output pool config to %" GST_PTR_FORMAT, config);

      if (!gst_buffer_pool_set_active (pool, TRUE))
        goto activate_failed;
    }

    GST_AML_VIDEO_DECODER_STREAM_UNLOCK (decoder);
    ret =
        gst_aml_v4l2_buffer_pool_process(GST_AML_V4L2_BUFFER_POOL(self->v4l2output->pool), &codec_data);
    self->codec_data_inject = TRUE;
    GST_AML_VIDEO_DECODER_STREAM_LOCK (decoder);

    gst_buffer_unref (codec_data);

    /* For decoders G_FMT returns coded size, G_SELECTION returns visible size
     * in the compose rectangle. gst_aml_v4l2_object_acquire_format() checks both
     * and returns the visible size as with/height and the coded size as
     * padding. */
  }

  task_state = gst_pad_get_task_state (GST_AML_VIDEO_DECODER_SRC_PAD (self));
  if (task_state == GST_TASK_STOPPED || task_state == GST_TASK_PAUSED)
  {
    /* It's possible that the processing thread stopped due to an error */
    if (self->output_flow != GST_FLOW_OK &&
        self->output_flow != GST_FLOW_FLUSHING)
    {
      GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
      ret = self->output_flow;
      goto drop;
    }

    GST_DEBUG_OBJECT (self, "Starting decoding thread");

    /* Start the processing task, when it quits, the task will disable input
     * processing to unlock input if draining, or prevent potential block */
    self->output_flow = GST_FLOW_FLUSHING;
    /*reset poll and need_drop_event before start decoding loop thread*/
    self->v4l2capture->need_drop_event = FALSE;
    gst_poll_set_flushing(self->v4l2capture->poll, FALSE);
    if (!gst_pad_start_task(decoder->srcpad,
            (GstTaskFunction) gst_aml_v4l2_video_dec_loop, self, NULL))
      goto start_task_failed;
  }

  if (!processed)
  {
    GST_AML_VIDEO_DECODER_STREAM_UNLOCK (decoder);
    if (!self->codec_data_inject && self->input_state->codec_data)
    {
      ret = gst_aml_v4l2_buffer_pool_process
      (GST_AML_V4L2_BUFFER_POOL(self->v4l2output->pool), &self->input_state->codec_data);
      self->codec_data_inject = TRUE;
      if (ret != GST_FLOW_OK)
          goto send_codec_failed;
    }
    ret =
        gst_aml_v4l2_buffer_pool_process(GST_AML_V4L2_BUFFER_POOL(self->v4l2output->pool), &frame->input_buffer);
    GST_AML_VIDEO_DECODER_STREAM_LOCK (decoder);

    if (ret == GST_FLOW_FLUSHING)
    {
      if (gst_pad_get_task_state (GST_AML_VIDEO_DECODER_SRC_PAD (self)) !=
          GST_TASK_STARTED)
        ret = self->output_flow;
      goto drop;
    }
    else if (ret != GST_FLOW_OK)
    {
      goto process_failed;
    }
  }

  /* No need to keep input around */
  tmp = frame->input_buffer;
  frame->input_buffer = gst_buffer_new ();
  gst_buffer_copy_into (frame->input_buffer, tmp,
      GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS |
      GST_BUFFER_COPY_META, 0, 0);
  gst_buffer_unref (tmp);

  gst_aml_video_codec_frame_unref (frame);
  return ret;

  /* ERRORS */
send_codec_failed:
  GST_ERROR_OBJECT(self, "send codec_date fialed.ret is %d",ret);
  goto drop;
not_negotiated:
  {
    GST_ERROR_OBJECT (self, "not negotiated");
    ret = GST_FLOW_NOT_NEGOTIATED;
    gst_aml_v4l2_error (self, &error);
    goto drop;
  }
activate_failed:
  {
    GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
        (_("Failed to allocate required memory.")),
        ("Buffer pool activation failed"));
    ret = GST_FLOW_ERROR;
    goto drop;
  }
flushing:
  {
    ret = GST_FLOW_FLUSHING;
    goto drop;
  }

start_task_failed:
  {
    GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
        (_("Failed to start decoding thread.")), (NULL));
    ret = GST_FLOW_ERROR;
    goto drop;
  }
process_failed:
  {
    GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
        (_("Failed to process frame.")),
        ("Maybe be due to not enough memory or failing driver"));
    ret = GST_FLOW_ERROR;
    goto drop;
  }
drop:
  {
    gst_aml_video_decoder_drop_frame (decoder, frame);
    return ret;
  }
}

static gboolean
gst_aml_v4l2_video_dec_decide_allocation (GstAmlVideoDecoder * decoder,
    GstQuery * query)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC (decoder);
  GstClockTime latency;
  gboolean ret = FALSE;

  if (gst_aml_v4l2_object_decide_allocation (self->v4l2capture, query))
    ret = GST_AML_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder, query);

  if (GST_CLOCK_TIME_IS_VALID (self->v4l2capture->duration))
  {
    latency = self->v4l2capture->min_buffers * self->v4l2capture->duration;
    GST_DEBUG_OBJECT (self, "Setting latency: %" GST_TIME_FORMAT " (%"
        G_GUINT32_FORMAT " * %" G_GUINT64_FORMAT, GST_TIME_ARGS (latency),
        self->v4l2capture->min_buffers, self->v4l2capture->duration);
    gst_aml_video_decoder_set_latency (decoder, latency, latency);
  }
  else
  {
    GST_WARNING_OBJECT (self, "Duration invalid, not setting latency");
  }

  return ret;
}

static gboolean
gst_aml_v4l2_video_dec_src_query(GstAmlVideoDecoder *decoder, GstQuery *query)
{
  gboolean ret = TRUE;
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC (decoder);

  switch (GST_QUERY_TYPE (query))
  {
    case GST_QUERY_CAPS:
    {
      GstCaps *filter, *result = NULL;
      GstPad *pad = GST_AML_VIDEO_DECODER_SRC_PAD (decoder);

      gst_query_parse_caps (query, &filter);

      if (self->probed_srccaps)
        result = gst_caps_ref (self->probed_srccaps);
      else
        result = gst_pad_get_pad_template_caps (pad);

      if (filter)
      {
        GstCaps *tmp = result;
        result =
            gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
        gst_caps_unref (tmp);
      }

      GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);

      gst_query_set_caps_result (query, result);
      gst_caps_unref (result);
      break;
    }

    default:
      ret = GST_AML_VIDEO_DECODER_CLASS (parent_class)->src_query (decoder, query);
      break;
  }

  return ret;
}

static GstCaps *
gst_aml_v4l2_video_dec_sink_getcaps(GstAmlVideoDecoder *decoder, GstCaps *filter)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(decoder);
  GstCaps *result;

  result = gst_aml_video_decoder_proxy_getcaps (decoder, self->probed_sinkcaps,
      filter);

  GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);

  return result;
}

static gboolean
gst_aml_v4l2_video_dec_sink_event (GstAmlVideoDecoder *decoder, GstEvent *event)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC (decoder);
  gboolean ret;
  GstEventType type = GST_EVENT_TYPE (event);
  GST_DEBUG_OBJECT (self, "received event %p %" GST_PTR_FORMAT, event, event);

  switch (type)
  {
    case GST_EVENT_STREAM_START:
    {
      GstStructure *s;
      GstEvent *event;
      s = gst_structure_new("private_signal", "obj_ptr", G_TYPE_POINTER, self, "sig_name", G_TYPE_STRING, "decoded-pts", NULL);
      event = gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM, s);
      GST_DEBUG_OBJECT(self, "before Send private_signal Event :%p", event);
      gst_pad_push_event (decoder->sinkpad, event);
      GST_DEBUG_OBJECT(self, "after Send private_signal Event :%p", event);
      break;
    }
    case GST_EVENT_CAPS:
    {
      GstCaps *caps;
      GstStructure *structure;
      gint num, denom;

      gst_event_parse_caps (event, &caps);

      structure= gst_caps_get_structure(caps, 0);
      if ( gst_structure_has_field(structure, "parsed") )
      {
        gboolean parsed = TRUE;
        if ( gst_structure_get_boolean( structure, "parsed", &parsed ) )
        {
          self->v4l2output->stream_mode = !parsed;
          GST_DEBUG("frame parsed:%d, set stream_mode to %d", parsed, self->v4l2output->stream_mode);
        }
      }

      if ( gst_structure_has_field(structure, "secure") )
      {
        gboolean is_secure = FALSE;
        if ( gst_structure_get_boolean( structure, "secure", &is_secure ) )
        {
          self->v4l2output->secure_es = is_secure;
          GST_DEBUG("is secure es:%d", self->v4l2output->secure_es);
        }
      }
      else
      {
        GstCapsFeatures *const features = gst_caps_get_features(caps, 0);
        if (features && gst_caps_features_contains(features, GST_CAPS_FEATURE_MEMORY_DMABUF))
        {
          self->v4l2output->secure_es = TRUE;
          GST_DEBUG("If there is no secure field in caps, consider dma es is secure");
        }
      }

      if ( gst_structure_get_fraction( structure, "framerate", &num, &denom ) )
      {
        if ( denom == 0 ) denom= 1;

        if (self->v4l2capture->fps)
        {
          g_value_unset(self->v4l2capture->fps);
          g_free(self->v4l2capture->fps);
        }

        self->v4l2capture->fps = g_new0(GValue, 1);
        g_value_init(self->v4l2capture->fps, GST_TYPE_FRACTION);
        gst_value_set_fraction(self->v4l2capture->fps, num, denom);

        GST_DEBUG_OBJECT(self, "get framerate ratio %d:%d",  num, denom);
      }

      if (( gst_structure_get_fraction( structure, "pixel-aspect-ratio", &num, &denom ) ) &&
          ( !self->v4l2capture->have_set_par ) )
      {
        if ( (num <= 0) || (denom <= 0) )
        {
          num= denom= 1;
        }

        if ( self->v4l2capture->par )
        {
          g_value_unset(self->v4l2capture->par);
          g_free(self->v4l2capture->par);
        }

        self->v4l2capture->par = g_new0(GValue, 1);
        g_value_init(self->v4l2capture->par, GST_TYPE_FRACTION);
        gst_value_set_fraction(self->v4l2capture->par, num, denom);
        GST_DEBUG_OBJECT(self, "get pixel aspect ratio %d:%d",  num, denom);
      }
      break;
    }
    case GST_EVENT_FLUSH_START:
      GST_DEBUG_OBJECT (self, "flush start");

      g_mutex_lock (&self->res_chg_lock);
      while (self->is_res_chg)
      {
          GST_LOG_OBJECT(decoder, "wait resolution change finish");
          g_cond_wait(&self->res_chg_cond, &self->res_chg_lock);
      }
      g_mutex_unlock (&self->res_chg_lock);

      self->last_out_pts = GST_CLOCK_TIME_NONE;
      gst_aml_v4l2_object_flush_start (self->v4l2output);
      gst_aml_v4l2_object_flush_start (self->v4l2capture);
      break;
    default:
      break;
  }

  ret = GST_AML_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);

  switch (type)
  {
    case GST_EVENT_FLUSH_START:
      /* The processing thread should stop now, wait for it */
      gst_pad_stop_task (decoder->srcpad);
      self->codec_data_inject = FALSE;
      GST_DEBUG_OBJECT (self, "flush start done");
      break;
    default:
      break;
  }

  return ret;
}

static GstStateChangeReturn
gst_aml_v4l2_video_dec_change_state (GstElement * element,
    GstStateChange transition)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC(element);
  GstAmlVideoDecoder *decoder = GST_AML_VIDEO_DECODER(element);

  GST_DEBUG_OBJECT(element, "change state from %s to %s",
    gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
    gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));

  if (transition == GST_STATE_CHANGE_PAUSED_TO_READY)
  {
    g_atomic_int_set (&self->active, FALSE);
    gst_aml_v4l2_object_flush_start (self->v4l2output);
    gst_aml_v4l2_object_flush_start (self->v4l2capture);
    gst_pad_stop_task (decoder->srcpad);
  }

  return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}

static void
gst_aml_v4l2_video_dec_dispose (GObject * object)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC (object);

  gst_caps_replace (&self->probed_sinkcaps, NULL);
  gst_caps_replace (&self->probed_srccaps, NULL);

  G_OBJECT_CLASS (parent_class)->dispose (object);
}

static void
gst_aml_v4l2_video_dec_finalize (GObject * object)
{
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC (object);

  gst_aml_v4l2_object_destroy (self->v4l2capture);
  gst_aml_v4l2_object_destroy (self->v4l2output);

  g_mutex_clear(&self->res_chg_lock);
  g_cond_clear(&self->res_chg_cond);

#if GST_IMPORT_LGE_PROP
  if (self->lge_ctxt)
  {
    if (self->lge_ctxt->app_type)
        g_free(self->lge_ctxt->app_type);
    if (self->lge_ctxt->res_info.coretype)
        g_free(self->lge_ctxt->res_info.coretype);
    free(self->lge_ctxt);
  }

#endif

  G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
gst_aml_v4l2_video_dec_init (GstAmlV4l2VideoDec * self)
{
  /* V4L2 object are created in subinstance_init */
  self->last_out_pts = GST_CLOCK_TIME_NONE;
  self->frame_duration = GST_CLOCK_TIME_NONE;
  self->is_secure_path = FALSE;
  self->is_res_chg = FALSE;
  self->codec_data_inject = FALSE;
  g_mutex_init(&self->res_chg_lock);
  g_cond_init(&self->res_chg_cond);
#if GST_IMPORT_LGE_PROP
  self->lge_ctxt = malloc(sizeof(GstAmlV4l2VideoDecLgeCtxt));
  memset(self->lge_ctxt, 0, sizeof(GstAmlV4l2VideoDecLgeCtxt));
#endif
}

static void
gst_aml_v4l2_video_dec_subinstance_init (GTypeInstance * instance, gpointer g_class)
{
  GstAmlV4l2VideoDecClass *klass = GST_AML_V4L2_VIDEO_DEC_CLASS (g_class);
  GstAmlV4l2VideoDec *self = GST_AML_V4L2_VIDEO_DEC (instance);
  GstAmlVideoDecoder *decoder = GST_AML_VIDEO_DECODER (instance);

  gst_aml_video_decoder_set_packetized (decoder, TRUE);

  self->v4l2output = gst_aml_v4l2_object_new (GST_ELEMENT (self),
      GST_OBJECT (GST_AML_VIDEO_DECODER_SINK_PAD (self)),
      V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
      gst_aml_v4l2_get_output, gst_aml_v4l2_set_output, NULL);
  self->v4l2output->no_initial_format = TRUE;
  self->v4l2output->keep_aspect = FALSE;
  self->v4l2output->is_svp = FALSE;

  self->v4l2capture = gst_aml_v4l2_object_new (GST_ELEMENT (self),
      GST_OBJECT (GST_AML_VIDEO_DECODER_SRC_PAD (self)),
      V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
      gst_aml_v4l2_get_input, gst_aml_v4l2_set_input, NULL);
  self->v4l2capture->need_wait_event = TRUE;
  self->v4l2capture->need_drop_event = FALSE;
}

static void
gst_aml_v4l2_video_dec_class_init (GstAmlV4l2VideoDecClass * klass)
{
  GstElementClass *element_class;
  GObjectClass *gobject_class;
  GstAmlVideoDecoderClass *video_decoder_class;

  parent_class = g_type_class_peek_parent (klass);

  element_class = (GstElementClass *) klass;
  gobject_class = (GObjectClass *) klass;
  video_decoder_class = (GstAmlVideoDecoderClass *) klass;

  GST_DEBUG_CATEGORY_INIT (gst_aml_v4l2_video_dec_debug, "amlv4l2videodec", 0,
      "AML V4L2 Video Decoder");

  gobject_class->dispose = GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_dispose);
  gobject_class->finalize = GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_finalize);
  gobject_class->set_property =
      GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_set_property);
  gobject_class->get_property =
      GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_get_property);

  video_decoder_class->open = GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_open);
  video_decoder_class->close = GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_close);
  video_decoder_class->start = GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_start);
  video_decoder_class->stop = GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_stop);
  video_decoder_class->finish = GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_finish);
  video_decoder_class->flush = GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_flush);
  video_decoder_class->drain = GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_drain);
  video_decoder_class->set_format =
      GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_set_format);
  video_decoder_class->negotiate =
      GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_negotiate);
  video_decoder_class->decide_allocation =
      GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_decide_allocation);
  /* FIXME propose_allocation or not ? */
  video_decoder_class->handle_frame =
      GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_handle_frame);
  video_decoder_class->getcaps =
      GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_sink_getcaps);
  video_decoder_class->src_query =
      GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_src_query);
  video_decoder_class->sink_event =
      GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_sink_event);

  element_class->change_state =
      GST_DEBUG_FUNCPTR(gst_aml_v4l2_video_dec_change_state);

  g_signals[SIGNAL_DECODED_PTS] = g_signal_new ("decoded-pts",
      G_TYPE_FROM_CLASS(GST_ELEMENT_CLASS(klass)),
      G_SIGNAL_RUN_LAST,
      0,    /* class offset */
      NULL, /* accumulator */
      NULL, /* accu data */
      g_cclosure_marshal_generic,
      G_TYPE_NONE,
      1,
      G_TYPE_UINT64);
  g_signals[SIGNAL_DECODED_ERROR_PTS] = g_signal_new ("decoded-error-pts",
      G_TYPE_FROM_CLASS(GST_ELEMENT_CLASS(klass)),
      G_SIGNAL_RUN_LAST,
      0,    /* class offset */
      NULL, /* accumulator */
      NULL, /* accu data */
      g_cclosure_marshal_generic,
      G_TYPE_NONE,
      1,
      G_TYPE_UINT64);

  gst_aml_v4l2_object_install_m2m_properties_helper (gobject_class);
#if GST_IMPORT_LGE_PROP
  gst_aml_v4l2_video_dec_install_lge_properties_helper(gobject_class);
#endif
}

static void
gst_aml_v4l2_video_dec_subclass_init (gpointer g_class, gpointer data)
{
  GstAmlV4l2VideoDecClass *klass = GST_AML_V4L2_VIDEO_DEC_CLASS (g_class);
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
  GstAmlV4l2VideoDecCData *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));

  gst_element_class_set_metadata (element_class, cdata->longname,
      "Codec/Decoder/Video/Hardware", cdata->description,
      "Xuesong Jiang <Xuesong.Jiang@amlogic.com>");

  gst_caps_unref (cdata->sink_caps);
  gst_caps_unref (cdata->src_caps);
  g_free (cdata);
}

/* Probing functions */
gboolean
gst_aml_v4l2_is_video_dec (GstCaps * sink_caps, GstCaps * src_caps)
{
  gboolean ret = FALSE;

  if (gst_caps_is_subset (sink_caps, gst_aml_v4l2_object_get_codec_caps ())
      && gst_caps_is_subset (src_caps, gst_aml_v4l2_object_get_raw_caps ()))
    ret = TRUE;

  return ret;
}

static gchar *
gst_aml_v4l2_video_dec_set_metadata (GstStructure * s, GstAmlV4l2VideoDecCData * cdata,
    const gchar * basename)
{
  gchar *codec_name = NULL;
  gchar *type_name = NULL;

#define SET_META(codec) \
G_STMT_START { \
  cdata->longname = "AML V4L2 " codec " Decoder"; \
  cdata->description = "Decodes " codec " streams via V4L2 API"; \
  codec_name = g_ascii_strdown (codec, -1); \
} G_STMT_END

  if (gst_structure_has_name(s, "video/mjpeg"))
  {
    SET_META("MJPEG");
  }
  else if (gst_structure_has_name (s, "video/mpeg"))
  {
    //include mpeg1, mpeg2, mpeg4
    SET_META("MPEG4");
  }
  else if (gst_structure_has_name (s, "video/x-h263"))
  {
    SET_META ("H263");
  }
  else if (gst_structure_has_name (s, "video/x-fwht"))
  {
    SET_META ("FWHT");
  }
  else if (gst_structure_has_name (s, "video/x-h264"))
  {
    SET_META ("H264");
  }
  else if (gst_structure_has_name (s, "video/x-h265"))
  {
    SET_META ("H265");
  }
  else if (gst_structure_has_name (s, "video/x-wmv"))
  {
    SET_META ("VC1");
  }
  else if (gst_structure_has_name (s, "video/x-vp8"))
  {
    SET_META ("VP8");
  }
  else if (gst_structure_has_name (s, "video/x-vp9"))
  {
    SET_META ("VP9");
  }
  else if (gst_structure_has_name(s, "video/x-av1"))
  {
      SET_META("AV1");
  }
  else if (gst_structure_has_name(s, "video/x-avs"))
  {
      SET_META("AVS");
  }
  else if (gst_structure_has_name(s, "video/x-avs2"))
  {
      SET_META("AVS2");
  }
  else if (gst_structure_has_name(s, "video/x-avs3"))
  {
      SET_META("AVS3");
  }
  else if (gst_structure_has_name (s, "video/x-bayer"))
  {
    SET_META ("BAYER");
  }
  else if (gst_structure_has_name (s, "video/x-sonix"))
  {
    SET_META ("SONIX");
  }
  else if (gst_structure_has_name (s, "video/x-pwc1"))
  {
    SET_META ("PWC1");
  }
  else if (gst_structure_has_name (s, "video/x-pwc2"))
  {
    SET_META ("PWC2");
  }
  else
  {
    /* This code should be kept on sync with the exposed CODEC type of format
     * from gstamlv4l2object.c. This warning will only occur in case we forget
     * to also add a format here. */
    gchar *s_str = gst_structure_to_string (s);
    g_warning ("Missing fixed name mapping for caps '%s', this is a GStreamer "
        "bug, please report at https://bugs.gnome.org", s_str);
    g_free (s_str);
  }

  if (codec_name)
  {
    type_name = g_strdup_printf ("amlv4l2%sdec", codec_name);
    if (g_type_from_name (type_name) != 0)
    {
      g_free (type_name);
      type_name = g_strdup_printf ("amlv4l2%s%sdec", basename, codec_name);
    }

    g_free (codec_name);
  }

  return type_name;
#undef SET_META
}

void
gst_aml_v4l2_video_dec_register(GstPlugin *plugin, const gchar *basename,
                                     const gchar *device_path, GstCaps *sink_caps, GstCaps *src_caps)
{
  gint i;

  for (i = 0; i < gst_caps_get_size (sink_caps); i++)
  {
    GstAmlV4l2VideoDecCData *cdata;
    GstStructure *s;
    GTypeQuery type_query;
    GTypeInfo type_info = { 0, };
    GType type, subtype;
    gchar *type_name;

    s = gst_caps_get_structure (sink_caps, i);

    cdata = g_new0 (GstAmlV4l2VideoDecCData, 1);
    cdata->device = g_strdup (device_path);
    cdata->sink_caps = gst_caps_new_empty ();
    gst_caps_append_structure (cdata->sink_caps, gst_structure_copy (s));
    gst_caps_append_structure (cdata->sink_caps, gst_structure_copy (s));
    gst_caps_set_features(cdata->sink_caps, 0, gst_caps_features_from_string(GST_CAPS_FEATURE_MEMORY_DMABUF));
    cdata->src_caps = gst_caps_copy(src_caps);
    gst_caps_set_features_simple(cdata->src_caps, gst_caps_features_from_string(GST_CAPS_FEATURE_MEMORY_DMABUF));
    gst_caps_append(cdata->src_caps, gst_caps_copy (src_caps));
    type_name = gst_aml_v4l2_video_dec_set_metadata (s, cdata, basename);

    /* Skip over if we hit an unmapped type */
    if (!type_name)
    {
      g_free (cdata);
      continue;
    }

    type = gst_aml_v4l2_video_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_aml_v4l2_video_dec_subclass_init;
    type_info.class_data = cdata;
    type_info.instance_init = gst_aml_v4l2_video_dec_subinstance_init;

    subtype = g_type_register_static (type, type_name, &type_info, 0);
    if (!gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1,
            subtype))
      GST_WARNING ("Failed to register plugin '%s'", type_name);

    g_free (type_name);
  }
}

#if GST_IMPORT_LGE_PROP
static void gst_aml_v4l2_video_dec_install_lge_properties_helper(GObjectClass *gobject_class)
{
    g_object_class_install_property(gobject_class, LGE_RESOURCE_INFO,
                                    g_param_spec_object("resource-info", "resource-info",
                                                        "After acquisition of H/W resources is completed, allocated resource information must be delivered to the decoder and the sink",
                                                        GST_TYPE_STRUCTURE,
                                                        G_PARAM_READABLE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));

    g_object_class_install_property(gobject_class, LGE_DECODE_SIZE,
                                    g_param_spec_uint64("decoded-size", "decoded-size",
                                                        "The total amount of decoder element's decoded video es after constructing pipeline or flushing pipeline update unit is byte.",
                                                        0, G_MAXUINT64,
                                                        0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

    g_object_class_install_property(gobject_class, LGE_UNDECODE_SIZE,
                                    g_param_spec_uint64("undecoded-size", "undecoded-size",
                                                        "video decoder element's total undecoded data update unit is byte.",
                                                        0, G_MAXUINT64,
                                                        0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

    g_object_class_install_property(gobject_class, LGE_APP_TYPE,
                                    g_param_spec_string("app-type", "app-type",
                                                        "set application type.",
                                                        "default_app",
                                                        G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

    g_object_class_install_property(gobject_class, LGE_CLIP_MODE,
                                    g_param_spec_boolean("clip-mode", "clip-mode",
                                                         "When seeking, Content is moving faster for a while to skip frames.",
                                                         FALSE,
                                                         G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
#endif