C++ GST_BUFFER_FLAG_SET函数代码示例

static GstBuffer *
gst_rtp_mpa_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
{
  GstRtpMPADepay *rtpmpadepay;
  GstBuffer *outbuf;
  GstRTPBuffer rtp = { NULL };
  gint payload_len;
#if 0
  guint8 *payload;
  guint16 frag_offset;
#endif
  gboolean marker;

  rtpmpadepay = GST_RTP_MPA_DEPAY (depayload);

  gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);

  payload_len = gst_rtp_buffer_get_payload_len (&rtp);

  if (payload_len <= 4)
    goto empty_packet;

#if 0
  payload = gst_rtp_buffer_get_payload (&rtp);
  /* strip off header
   *
   *  0                   1                   2                   3
   *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * |             MBZ               |          Frag_offset          |
   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   */
  frag_offset = (payload[2] << 8) | payload[3];
#endif

  /* subbuffer skipping the 4 header bytes */
  outbuf = gst_rtp_buffer_get_payload_subbuffer (&rtp, 4, -1);
  marker = gst_rtp_buffer_get_marker (&rtp);

  if (marker) {
    /* mark start of talkspurt with RESYNC */
    GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_RESYNC);
  }
  GST_DEBUG_OBJECT (rtpmpadepay,
      "gst_rtp_mpa_depay_chain: pushing buffer of size %" G_GSIZE_FORMAT "",
      gst_buffer_get_size (outbuf));

  gst_rtp_buffer_unmap (&rtp);

  /* FIXME, we can push half mpeg frames when they are split over multiple
   * RTP packets */
  return outbuf;

  /* ERRORS */
empty_packet:
  {
    GST_ELEMENT_WARNING (rtpmpadepay, STREAM, DECODE,
        ("Empty Payload."), (NULL));
    gst_rtp_buffer_unmap (&rtp);
    return NULL;
  }
}

static GstFlowReturn
gst_vaapidecode_push_decoded_frame (GstVideoDecoder * vdec,
    GstVideoCodecFrame * out_frame)
{
  GstVaapiDecode *const decode = GST_VAAPIDECODE (vdec);
  GstVaapiSurfaceProxy *proxy;
  GstVaapiSurface *surface;
  GstFlowReturn ret;
  const GstVaapiRectangle *crop_rect;
  GstVaapiVideoMeta *meta;
  GstBufferPoolAcquireParams *params = NULL;
  GstVaapiVideoBufferPoolAcquireParams vaapi_params = { {0,}, };
  guint flags, out_flags = 0;
  gboolean alloc_renegotiate, caps_renegotiate;

  if (!GST_VIDEO_CODEC_FRAME_IS_DECODE_ONLY (out_frame)) {
    proxy = gst_video_codec_frame_get_user_data (out_frame);
    surface = GST_VAAPI_SURFACE_PROXY_SURFACE (proxy);
    crop_rect = gst_vaapi_surface_proxy_get_crop_rect (proxy);

    /* in theory, we are not supposed to check the surface resolution
     * change here since it should be advertised before from ligstvaapi.
     * But there are issues with it especially for some vp9 streams where
     * upstream element set un-cropped values in set_format() which make
     * everything a mess. So better doing the explicit check here irrespective
     * of what notification we get from upstream or libgstvaapi.Also, even if
     * we received notification from libgstvaapi, the frame we are going to
     * be pushed at this point might not have the notified resolution if there
     * are queued frames in decoded picture buffer. */
    alloc_renegotiate = is_surface_resolution_changed (decode, surface);
    caps_renegotiate = is_display_resolution_changed (decode, crop_rect);

    if (gst_pad_needs_reconfigure (GST_VIDEO_DECODER_SRC_PAD (vdec))
        || alloc_renegotiate || caps_renegotiate || decode->do_renego) {

      g_atomic_int_set (&decode->do_renego, FALSE);
      if (!gst_vaapidecode_negotiate (decode))
        return GST_FLOW_ERROR;
    }

    gst_vaapi_surface_proxy_set_destroy_notify (proxy,
        (GDestroyNotify) gst_vaapidecode_release, gst_object_ref (decode));

    if (is_src_allocator_dmabuf (decode)) {
      vaapi_params.proxy = gst_vaapi_surface_proxy_ref (proxy);
      params = (GstBufferPoolAcquireParams *) & vaapi_params;
    }

    ret = gst_video_decoder_allocate_output_frame_with_params (vdec, out_frame,
        params);
    if (params)
      gst_vaapi_surface_proxy_unref (vaapi_params.proxy);
    if (ret != GST_FLOW_OK)
      goto error_create_buffer;

    /* if not dmabuf is negotiated set the vaapi video meta in the
     * proxy */
    if (!params) {
      meta = gst_buffer_get_vaapi_video_meta (out_frame->output_buffer);
      if (!meta)
        goto error_get_meta;
      gst_vaapi_video_meta_set_surface_proxy (meta, proxy);
    }

    flags = gst_vaapi_surface_proxy_get_flags (proxy);
    if (flags & GST_VAAPI_SURFACE_PROXY_FLAG_CORRUPTED)
      out_flags |= GST_BUFFER_FLAG_CORRUPTED;
    if (flags & GST_VAAPI_SURFACE_PROXY_FLAG_INTERLACED) {
      out_flags |= GST_VIDEO_BUFFER_FLAG_INTERLACED;
      if (flags & GST_VAAPI_SURFACE_PROXY_FLAG_TFF)
        out_flags |= GST_VIDEO_BUFFER_FLAG_TFF;
      if (flags & GST_VAAPI_SURFACE_PROXY_FLAG_RFF)
        out_flags |= GST_VIDEO_BUFFER_FLAG_RFF;
      if (flags & GST_VAAPI_SURFACE_PROXY_FLAG_ONEFIELD)
        out_flags |= GST_VIDEO_BUFFER_FLAG_ONEFIELD;
    }
    GST_BUFFER_FLAG_SET (out_frame->output_buffer, out_flags);

    if (flags & GST_VAAPI_SURFACE_PROXY_FLAG_FFB) {
      GST_BUFFER_FLAG_SET (out_frame->output_buffer,
          GST_VIDEO_BUFFER_FLAG_FIRST_IN_BUNDLE);
    }
#if (USE_GLX || USE_EGL)
    if (decode->has_texture_upload_meta)
      gst_buffer_ensure_texture_upload_meta (out_frame->output_buffer);
#endif
  }

  if (decode->in_segment.rate < 0.0
      && !GST_VIDEO_CODEC_FRAME_IS_SYNC_POINT (out_frame)) {
    GST_TRACE_OBJECT (decode, "drop frame in reverse playback");
    gst_video_decoder_release_frame (GST_VIDEO_DECODER (decode), out_frame);
    return GST_FLOW_OK;
  }

  ret = gst_video_decoder_finish_frame (vdec, out_frame);
  if (ret != GST_FLOW_OK)
    goto error_commit_buffer;
  return GST_FLOW_OK;

//.........这里部分代码省略.........

//.........这里部分代码省略.........
      capture_packet_free (p);
    GST_DEBUG_OBJECT (self, "Flushing");
    return GST_FLOW_FLUSHING;
  }

  p->packet->GetBytes ((gpointer *) & data);
  sample_count = p->packet->GetSampleFrameCount ();
  data_size = self->info.bpf * sample_count;

  ap = (AudioPacket *) g_malloc0 (sizeof (AudioPacket));

  *buffer =
      gst_buffer_new_wrapped_full ((GstMemoryFlags) GST_MEMORY_FLAG_READONLY,
      (gpointer) data, data_size, 0, data_size, ap,
      (GDestroyNotify) audio_packet_free);

  ap->packet = p->packet;
  p->packet->AddRef ();
  ap->input = self->input->input;
  ap->input->AddRef ();

  timestamp = p->capture_time;

  // Jitter and discontinuity handling, based on audiobasesrc
  start_time = timestamp;

  // Convert to the sample numbers
  start_offset =
      gst_util_uint64_scale (start_time, self->info.rate, GST_SECOND);

  end_offset = start_offset + sample_count;
  end_time = gst_util_uint64_scale_int (end_offset, GST_SECOND,
      self->info.rate);

  duration = end_time - start_time;

  if (self->next_offset == (guint64) - 1) {
    discont = TRUE;
  } else {
    guint64 diff, max_sample_diff;

    // Check discont
    if (start_offset <= self->next_offset)
      diff = self->next_offset - start_offset;
    else
      diff = start_offset - self->next_offset;

    max_sample_diff =
        gst_util_uint64_scale_int (self->alignment_threshold, self->info.rate,
        GST_SECOND);

    // Discont!
    if (G_UNLIKELY (diff >= max_sample_diff)) {
      if (self->discont_wait > 0) {
        if (self->discont_time == GST_CLOCK_TIME_NONE) {
          self->discont_time = start_time;
        } else if (start_time - self->discont_time >= self->discont_wait) {
          discont = TRUE;
          self->discont_time = GST_CLOCK_TIME_NONE;
        }
      } else {
        discont = TRUE;
      }
    } else if (G_UNLIKELY (self->discont_time != GST_CLOCK_TIME_NONE)) {
      // we have had a discont, but are now back on track!
      self->discont_time = GST_CLOCK_TIME_NONE;
    }
  }

  if (discont) {
    // Have discont, need resync and use the capture timestamps
    if (self->next_offset != (guint64) - 1)
      GST_INFO_OBJECT (self, "Have discont. Expected %"
          G_GUINT64_FORMAT ", got %" G_GUINT64_FORMAT,
          self->next_offset, start_offset);
    GST_BUFFER_FLAG_SET (*buffer, GST_BUFFER_FLAG_DISCONT);
    self->next_offset = end_offset;
  } else {
    // No discont, just keep counting
    self->discont_time = GST_CLOCK_TIME_NONE;
    timestamp =
        gst_util_uint64_scale (self->next_offset, GST_SECOND, self->info.rate);
    self->next_offset += sample_count;
    duration =
        gst_util_uint64_scale (self->next_offset, GST_SECOND,
        self->info.rate) - timestamp;
  }

  GST_BUFFER_TIMESTAMP (*buffer) = timestamp;
  GST_BUFFER_DURATION (*buffer) = duration;

  GST_DEBUG_OBJECT (self,
      "Outputting buffer %p with timestamp %" GST_TIME_FORMAT " and duration %"
      GST_TIME_FORMAT, *buffer, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (*buffer)),
      GST_TIME_ARGS (GST_BUFFER_DURATION (*buffer)));

  capture_packet_free (p);

  return flow_ret;
}

/* flush the oldest buffer */
static GstFlowReturn
gst_video_rate_flush_prev (GstVideoRate * videorate, gboolean duplicate)
{
  GstFlowReturn res;
  GstBuffer *outbuf;
  GstClockTime push_ts;

  if (!videorate->prevbuf)
    goto eos_before_buffers;

  /* make sure we can write to the metadata */
  outbuf = gst_buffer_make_writable (gst_buffer_ref (videorate->prevbuf));

  GST_BUFFER_OFFSET (outbuf) = videorate->out;
  GST_BUFFER_OFFSET_END (outbuf) = videorate->out + 1;

  if (videorate->discont) {
    GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
    videorate->discont = FALSE;
  } else
    GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DISCONT);

  if (duplicate)
    GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_GAP);
  else
    GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_GAP);

  /* this is the timestamp we put on the buffer */
  push_ts = videorate->next_ts;

  videorate->out++;
  videorate->out_frame_count++;
  if (videorate->to_rate_numerator) {
    /* interpolate next expected timestamp in the segment */
    videorate->next_ts =
        videorate->segment.base + videorate->segment.start +
        videorate->base_ts + gst_util_uint64_scale (videorate->out_frame_count,
        videorate->to_rate_denominator * GST_SECOND,
        videorate->to_rate_numerator);
    GST_BUFFER_DURATION (outbuf) = videorate->next_ts - push_ts;
  }

  /* We do not need to update time in VFR (variable frame rate) mode */
  if (!videorate->drop_only) {
    /* adapt for looping, bring back to time in current segment. */
    GST_BUFFER_TIMESTAMP (outbuf) = push_ts - videorate->segment.base;
  }

  GST_LOG_OBJECT (videorate,
      "old is best, dup, pushing buffer outgoing ts %" GST_TIME_FORMAT,
      GST_TIME_ARGS (push_ts));

  res = gst_pad_push (GST_BASE_TRANSFORM_SRC_PAD (videorate), outbuf);

  return res;

  /* WARNINGS */
eos_before_buffers:
  {
    GST_INFO_OBJECT (videorate, "got EOS before any buffer was received");
    return GST_FLOW_OK;
  }
}

//.........这里部分代码省略.........
        timidity->time_per_frame;
    gst_segment_set_newsegment (timidity->o_segment, FALSE, 1.0,
        GST_FORMAT_DEFAULT, 0, GST_CLOCK_TIME_NONE, 0);


    gst_pad_push_event (timidity->srcpad,
        gst_timidity_get_new_segment_event (timidity, GST_FORMAT_TIME, FALSE));

    /* extract tags */
    text = mid_song_get_meta (timidity->song, MID_SONG_TEXT);
    if (text) {
      tags = gst_tag_list_new ();
      gst_tag_list_add (tags, GST_TAG_MERGE_APPEND, GST_TAG_TITLE, text, NULL);

      //g_free (text);
    }

    text = mid_song_get_meta (timidity->song, MID_SONG_COPYRIGHT);
    if (text) {
      if (tags == NULL)
        tags = gst_tag_list_new ();
      gst_tag_list_add (tags, GST_TAG_MERGE_APPEND,
          GST_TAG_COPYRIGHT, text, NULL);

      //g_free (text);
    }

    if (tags) {
      gst_element_found_tags (GST_ELEMENT (timidity), tags);
    }

    GST_DEBUG_OBJECT (timidity, "Parsing song done");
    return;
  }

  if (timidity->o_segment_changed) {
    GstSegment *segment = gst_timidity_get_segment (timidity, GST_FORMAT_TIME,
        !timidity->o_new_segment);

    GST_LOG_OBJECT (timidity,
        "sending newsegment from %" GST_TIME_FORMAT "-%" GST_TIME_FORMAT
        ", pos=%" GST_TIME_FORMAT, GST_TIME_ARGS ((guint64) segment->start),
        GST_TIME_ARGS ((guint64) segment->stop),
        GST_TIME_ARGS ((guint64) segment->time));

    if (timidity->o_segment->flags & GST_SEEK_FLAG_SEGMENT) {
      gst_element_post_message (GST_ELEMENT (timidity),
          gst_message_new_segment_start (GST_OBJECT (timidity),
              segment->format, segment->start));
    }

    gst_segment_free (segment);
    timidity->o_segment_changed = FALSE;
    return;
  }

  if (timidity->o_seek) {
    /* perform a seek internally */
    timidity->o_segment->last_stop = timidity->o_segment->time;
    mid_song_seek (timidity->song,
        (timidity->o_segment->last_stop * timidity->time_per_frame) /
        GST_MSECOND);
  }

  out = gst_timidity_get_buffer (timidity);
  if (!out) {
    GST_LOG_OBJECT (timidity, "Song ended, generating eos");
    gst_pad_push_event (timidity->srcpad, gst_event_new_eos ());
    timidity->o_seek = FALSE;
    goto paused;
  }

  if (timidity->o_seek) {
    GST_BUFFER_FLAG_SET (out, GST_BUFFER_FLAG_DISCONT);
    timidity->o_seek = FALSE;
  }

  gst_buffer_set_caps (out, timidity->out_caps);
  ret = gst_pad_push (timidity->srcpad, out);

  if (GST_FLOW_IS_FATAL (ret) || ret == GST_FLOW_NOT_LINKED)
    goto error;

  return;

paused:
  {
    GST_DEBUG_OBJECT (timidity, "pausing task");
    gst_pad_pause_task (timidity->sinkpad);
    return;
  }
error:
  {
    GST_ELEMENT_ERROR (timidity, STREAM, FAILED,
        ("Internal data stream error"),
        ("Streaming stopped, reason %s", gst_flow_get_name (ret)));
    gst_pad_push_event (timidity->srcpad, gst_event_new_eos ());
    goto paused;
  }
}

static GstFlowReturn
gst_vdp_vpp_drain (GstVdpVideoPostProcess * vpp)
{
  GstVdpPicture current_pic;

  guint32 video_surfaces_past_count;
  VdpVideoSurface video_surfaces_past[MAX_PICTURES];

  guint32 video_surfaces_future_count;
  VdpVideoSurface video_surfaces_future[MAX_PICTURES];

  GstFlowReturn ret;

  while (gst_vdp_vpp_get_next_picture (vpp,
          &current_pic,
          &video_surfaces_past_count, video_surfaces_past,
          &video_surfaces_future_count, video_surfaces_future)) {
    GError *err;
    GstVdpOutputBuffer *outbuf;

    GstStructure *structure;
    GstVideoRectangle src_r = { 0, }
    , dest_r = {
    0,};
    VdpRect rect;

    GstVdpDevice *device;
    VdpStatus status;

    err = NULL;
    ret =
        gst_vdp_output_src_pad_alloc_buffer ((GstVdpOutputSrcPad *) vpp->srcpad,
        &outbuf, &err);
    if (ret != GST_FLOW_OK)
      goto output_pad_error;

    src_r.w = vpp->width;
    src_r.h = vpp->height;
    if (vpp->got_par) {
      gint new_width;

      new_width = gst_util_uint64_scale_int (src_r.w, vpp->par_n, vpp->par_d);
      src_r.x += (src_r.w - new_width) / 2;
      src_r.w = new_width;
    }

    structure = gst_caps_get_structure (GST_BUFFER_CAPS (outbuf), 0);
    if (!gst_structure_get_int (structure, "width", &dest_r.w) ||
        !gst_structure_get_int (structure, "height", &dest_r.h))
      goto invalid_caps;

    if (vpp->force_aspect_ratio) {
      GstVideoRectangle res_r;

      gst_video_sink_center_rect (src_r, dest_r, &res_r, TRUE);
      rect.x0 = res_r.x;
      rect.x1 = res_r.w + res_r.x;
      rect.y0 = res_r.y;
      rect.y1 = res_r.h + res_r.y;
    } else {
      rect.x0 = 0;
      rect.x1 = dest_r.w;
      rect.y0 = 0;
      rect.y1 = dest_r.h;
    }

    device = vpp->device;
    status =
        device->vdp_video_mixer_render (vpp->mixer, VDP_INVALID_HANDLE, NULL,
        current_pic.structure, video_surfaces_past_count, video_surfaces_past,
        current_pic.buf->surface, video_surfaces_future_count,
        video_surfaces_future, NULL, outbuf->surface, NULL, &rect, 0, NULL);
    if (status != VDP_STATUS_OK)
      goto render_error;

    GST_BUFFER_TIMESTAMP (outbuf) = current_pic.timestamp;
    if (gst_vdp_vpp_is_interlaced (vpp))
      GST_BUFFER_DURATION (outbuf) = vpp->field_duration;
    else
      GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (current_pic.buf);

    if (GST_BUFFER_FLAG_IS_SET (current_pic.buf, GST_BUFFER_FLAG_DISCONT))
      GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);

    if (GST_BUFFER_FLAG_IS_SET (current_pic.buf, GST_BUFFER_FLAG_PREROLL))
      GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_PREROLL);

    if (GST_BUFFER_FLAG_IS_SET (current_pic.buf, GST_BUFFER_FLAG_GAP))
      GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_GAP);

    err = NULL;
    ret =
        gst_vdp_output_src_pad_push ((GstVdpOutputSrcPad *) vpp->srcpad,
        outbuf, &err);
    if (ret != GST_FLOW_OK)
      goto output_pad_error;

    continue;

  invalid_caps:
//.........这里部分代码省略.........

static GstFlowReturn
gst_vdp_vpp_chain (GstPad * pad, GstBuffer * buffer)
{
  GstVdpVideoPostProcess *vpp =
      GST_VDP_VIDEO_POST_PROCESS (gst_pad_get_parent (pad));

  GstClockTime qostime;
  GstFlowReturn ret = GST_FLOW_OK;
  GError *err;

  GST_DEBUG ("chain");

  /* can only do QoS if the segment is in TIME */
  if (vpp->segment.format != GST_FORMAT_TIME)
    goto no_qos;

  /* QOS is done on the running time of the buffer, get it now */
  qostime = gst_segment_to_running_time (&vpp->segment, GST_FORMAT_TIME,
      GST_BUFFER_TIMESTAMP (buffer));

  if (qostime != -1) {
    gboolean need_skip;
    GstClockTime earliest_time;

    /* lock for getting the QoS parameters that are set (in a different thread)
     * with the QOS events */
    GST_OBJECT_LOCK (vpp);
    earliest_time = vpp->earliest_time;
    /* check for QoS, don't perform conversion for buffers
     * that are known to be late. */
    need_skip = GST_CLOCK_TIME_IS_VALID (earliest_time) && qostime != -1 &&
        qostime <= earliest_time;

    GST_OBJECT_UNLOCK (vpp);

    if (need_skip) {
      GST_DEBUG_OBJECT (vpp, "skipping transform: qostime %"
          GST_TIME_FORMAT " <= %" GST_TIME_FORMAT,
          GST_TIME_ARGS (qostime), GST_TIME_ARGS (earliest_time));
      /* mark discont for next buffer */
      vpp->discont = TRUE;
      gst_buffer_unref (buffer);
      return GST_FLOW_OK;
    }
  }

no_qos:

  if (vpp->discont) {
    GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
    vpp->discont = FALSE;
  }

  if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
    GST_DEBUG_OBJECT (vpp, "Received discont buffer");
    gst_vdp_vpp_flush (vpp);
  }

  if (!vpp->native_input) {
    GstVdpVideoBuffer *video_buf;

    err = NULL;
    video_buf =
        (GstVdpVideoBuffer *) gst_vdp_buffer_pool_get_buffer (vpp->vpool, &err);
    if (G_UNLIKELY (!video_buf))
      goto video_buf_error;

    if (!gst_vdp_video_buffer_upload (video_buf, buffer, vpp->fourcc,
            vpp->width, vpp->height)) {
      gst_buffer_unref (GST_BUFFER (video_buf));
      GST_ELEMENT_ERROR (vpp, RESOURCE, READ,
          ("Couldn't upload YUV data to vdpau"), (NULL));
      ret = GST_FLOW_ERROR;
      goto error;
    }

    gst_buffer_copy_metadata (GST_BUFFER (video_buf), buffer,
        GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS);

    gst_buffer_unref (buffer);
    buffer = GST_BUFFER (video_buf);
  }

  if (G_UNLIKELY (vpp->mixer == VDP_INVALID_HANDLE)) {
    ret = gst_vdp_vpp_create_mixer (vpp);
    if (ret != GST_FLOW_OK)
      goto error;
  }

  gst_vdp_vpp_add_buffer (vpp, GST_VDP_VIDEO_BUFFER (buffer));

  ret = gst_vdp_vpp_drain (vpp);

done:
  gst_object_unref (vpp);

  return ret;

error:
  gst_buffer_unref (buffer);
//.........这里部分代码省略.........

static GstFlowReturn
gst_shm_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)
{
  GstShmSrc *self = GST_SHM_SRC (psrc);
  gchar *buf = NULL;
  int rv = 0;
  struct GstShmBuffer *gsb;

  do {
    if (gst_poll_wait (self->poll, GST_CLOCK_TIME_NONE) < 0) {
      if (errno == EBUSY)
        return GST_FLOW_WRONG_STATE;
      GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"),
          ("Poll failed on fd: %s", strerror (errno)));
      return GST_FLOW_ERROR;
    }

    if (self->unlocked)
      return GST_FLOW_WRONG_STATE;

    if (gst_poll_fd_has_closed (self->poll, &self->pollfd)) {
      GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"),
          ("Control socket has closed"));
      return GST_FLOW_ERROR;
    }

    if (gst_poll_fd_has_error (self->poll, &self->pollfd)) {
      GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"),
          ("Control socket has error"));
      return GST_FLOW_ERROR;
    }

    if (gst_poll_fd_can_read (self->poll, &self->pollfd)) {
      buf = NULL;
      GST_LOG_OBJECT (self, "Reading from pipe");
      GST_OBJECT_LOCK (self);
      rv = sp_client_recv (self->pipe->pipe, &buf);
      GST_OBJECT_UNLOCK (self);
      if (rv < 0) {
        GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"),
            ("Error reading control data: %d", rv));
        return GST_FLOW_ERROR;
      }
    }
  } while (buf == NULL);

  GST_LOG_OBJECT (self, "Got buffer %p of size %d", buf, rv);

  gsb = g_slice_new0 (struct GstShmBuffer);
  gsb->buf = buf;
  gsb->pipe = self->pipe;
  gst_shm_pipe_inc (self->pipe);

  *outbuf = gst_buffer_new ();
  GST_BUFFER_FLAG_SET (*outbuf, GST_BUFFER_FLAG_READONLY);
  GST_BUFFER_DATA (*outbuf) = (guint8 *) buf;
  GST_BUFFER_SIZE (*outbuf) = rv;
  GST_BUFFER_MALLOCDATA (*outbuf) = (guint8 *) gsb;
  GST_BUFFER_FREE_FUNC (*outbuf) = free_buffer;

  return GST_FLOW_OK;
}

//.........这里部分代码省略.........
    CMR = (payload[0] & 0xf0) >> 4;

    /* strip CMR header now, pack FT and the data for the decoder */
    payload_len -= 1;
    payload += 1;

    GST_DEBUG_OBJECT (rtpamrdepay, "payload len %d", payload_len);

    if (rtpamrdepay->interleaving) {
      ILL = (payload[0] & 0xf0) >> 4;
      ILP = (payload[0] & 0x0f);

      payload_len -= 1;
      payload += 1;

      if (ILP > ILL)
        goto wrong_interleaving;
    }

    /*
     *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
     * +-+-+-+-+-+-+-+-+..
     * |F|  FT   |Q|P|P| more FT..
     * +-+-+-+-+-+-+-+-+..
     */
    /* count number of packets by counting the FTs. Also
     * count number of amr data bytes and number of non-empty
     * packets (this is also the number of CRCs if present). */
    amr_len = 0;
    num_nonempty_packets = 0;
    num_packets = 0;
    for (i = 0; i < payload_len; i++) {
      gint fr_size;
      guint8 FT;

      FT = (payload[i] & 0x78) >> 3;

      fr_size = frame_size[FT];
      GST_DEBUG_OBJECT (rtpamrdepay, "frame size %d", fr_size);
      if (fr_size == -1)
        goto wrong_framesize;

      if (fr_size > 0) {
        amr_len += fr_size;
        num_nonempty_packets++;
      }
      num_packets++;

      if ((payload[i] & 0x80) == 0)
        break;
    }

    if (rtpamrdepay->crc) {
      /* data len + CRC len + header bytes should be smaller than payload_len */
      if (num_packets + num_nonempty_packets + amr_len > payload_len)
        goto wrong_length_1;
    } else {
      /* data len + header bytes should be smaller than payload_len */
      if (num_packets + amr_len > payload_len)
        goto wrong_length_2;
    }

    outbuf = gst_buffer_new_and_alloc (payload_len);

    /* point to destination */
    p = GST_BUFFER_DATA (outbuf);
    /* point to first data packet */
    dp = payload + num_packets;
    if (rtpamrdepay->crc) {
      /* skip CRC if present */
      dp += num_nonempty_packets;
    }

    for (i = 0; i < num_packets; i++) {
      gint fr_size;

      /* copy FT, clear F bit */
      *p++ = payload[i] & 0x7f;

      fr_size = frame_size[(payload[i] & 0x78) >> 3];
      if (fr_size > 0) {
        /* copy data packet, FIXME, calc CRC here. */
        memcpy (p, dp, fr_size);

        p += fr_size;
        dp += fr_size;
      }
    }
    /* we can set the duration because each packet is 20 milliseconds */
    GST_BUFFER_DURATION (outbuf) = num_packets * 20 * GST_MSECOND;

    if (gst_rtp_buffer_get_marker (buf)) {
      /* marker bit marks a discont buffer after a talkspurt. */
      GST_DEBUG_OBJECT (depayload, "marker bit was set");
      GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
    }

    GST_DEBUG_OBJECT (depayload, "pushing buffer of size %d",
        GST_BUFFER_SIZE (outbuf));
  }

static void
gst_decklink_src_task (void *priv)
{
    GstDecklinkSrc *decklinksrc = GST_DECKLINK_SRC (priv);
    GstBuffer *buffer;
    GstBuffer *audio_buffer;
    IDeckLinkVideoInputFrame *video_frame;
    IDeckLinkAudioInputPacket *audio_frame;
    void *data;
    int n_samples;
    GstFlowReturn ret;
    const GstDecklinkMode *mode;

    GST_DEBUG_OBJECT (decklinksrc, "task");

    g_mutex_lock (decklinksrc->mutex);
    while (decklinksrc->video_frame == NULL && !decklinksrc->stop) {
        g_cond_wait (decklinksrc->cond, decklinksrc->mutex);
    }
    video_frame = decklinksrc->video_frame;
    audio_frame = decklinksrc->audio_frame;
    decklinksrc->video_frame = NULL;
    decklinksrc->audio_frame = NULL;
    g_mutex_unlock (decklinksrc->mutex);

    if (decklinksrc->stop) {
        GST_DEBUG ("stopping task");
        return;
    }

    /* warning on dropped frames */
    if (decklinksrc->dropped_frames - decklinksrc->dropped_frames_old > 0) {
        GST_ELEMENT_WARNING (decklinksrc, RESOURCE, READ,
                             ("Dropped %d frame(s), for a total of %d frame(s)",
                              decklinksrc->dropped_frames - decklinksrc->dropped_frames_old,
                              decklinksrc->dropped_frames),
                             (NULL));
        decklinksrc->dropped_frames_old = decklinksrc->dropped_frames;
    }

    mode = gst_decklink_get_mode (decklinksrc->mode);

    video_frame->GetBytes (&data);
    if (decklinksrc->copy_data) {
        buffer = gst_buffer_new_and_alloc (mode->width * mode->height * 2);

        memcpy (GST_BUFFER_DATA (buffer), data, mode->width * mode->height * 2);

        video_frame->Release ();
    } else {
        buffer = gst_buffer_new ();
        GST_BUFFER_SIZE (buffer) = mode->width * mode->height * 2;

        GST_BUFFER_DATA (buffer) = (guint8 *) data;

        GST_BUFFER_FREE_FUNC (buffer) = video_frame_free;
        GST_BUFFER_MALLOCDATA (buffer) = (guint8 *) video_frame;
    }

    GST_BUFFER_TIMESTAMP (buffer) =
        gst_util_uint64_scale_int (decklinksrc->frame_num * GST_SECOND,
                                   mode->fps_d, mode->fps_n);
    GST_BUFFER_DURATION (buffer) =
        gst_util_uint64_scale_int ((decklinksrc->frame_num + 1) * GST_SECOND,
                                   mode->fps_d, mode->fps_n) - GST_BUFFER_TIMESTAMP (buffer);
    GST_BUFFER_OFFSET (buffer) = decklinksrc->frame_num;
    GST_BUFFER_OFFSET_END (buffer) = decklinksrc->frame_num;
    if (decklinksrc->frame_num == 0) {
        GstEvent *event;
        gboolean ret;

        GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);

        event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0,
                                           GST_CLOCK_TIME_NONE, 0);

        ret = gst_pad_push_event (decklinksrc->videosrcpad, event);
        if (!ret) {
            GST_ERROR_OBJECT (decklinksrc, "new segment event ret=%d", ret);
            return;
        }
    }

    if (decklinksrc->video_caps == NULL) {
        decklinksrc->video_caps = gst_decklink_mode_get_caps (decklinksrc->mode);
    }
    gst_buffer_set_caps (buffer, decklinksrc->video_caps);

    ret = gst_pad_push (decklinksrc->videosrcpad, buffer);
    if (ret != GST_FLOW_OK) {
        GST_ELEMENT_ERROR (decklinksrc, CORE, NEGOTIATION, (NULL), (NULL));
    }

    if (gst_pad_is_linked (decklinksrc->audiosrcpad)) {
        n_samples = audio_frame->GetSampleFrameCount ();
        audio_frame->GetBytes (&data);
        audio_buffer = gst_buffer_new_and_alloc (n_samples * 2 * 2);
        memcpy (GST_BUFFER_DATA (audio_buffer), data, n_samples * 2 * 2);

        GST_BUFFER_TIMESTAMP (audio_buffer) =
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    guint64 fillsamples;

    /* We don't want to allocate a single unreasonably huge buffer - it might
       be hundreds of megabytes. So, limit each output buffer to one second of
       audio */
    fillsamples = in_offset - audiorate->next_offset;

    while (fillsamples > 0) {
      guint64 cursamples = MIN (fillsamples, audiorate->rate);

      fillsamples -= cursamples;
      fillsize = cursamples * audiorate->bytes_per_sample;

      fill = gst_buffer_new_and_alloc (fillsize);
      /* FIXME, 0 might not be the silence byte for the negotiated format. */
      memset (GST_BUFFER_DATA (fill), 0, fillsize);

      GST_DEBUG_OBJECT (audiorate, "inserting %lld samples", cursamples);

      GST_BUFFER_OFFSET (fill) = audiorate->next_offset;
      audiorate->next_offset += cursamples;
      GST_BUFFER_OFFSET_END (fill) = audiorate->next_offset;

      /* Use next timestamp, then calculate following timestamp based on 
       * offset to get duration. Neccesary complexity to get 'perfect' 
       * streams */
      GST_BUFFER_TIMESTAMP (fill) = audiorate->next_ts;
      audiorate->next_ts = gst_util_uint64_scale_int (audiorate->next_offset,
          GST_SECOND, audiorate->rate);
      GST_BUFFER_DURATION (fill) = audiorate->next_ts -
          GST_BUFFER_TIMESTAMP (fill);

      /* we created this buffer to fill a gap */
      GST_BUFFER_FLAG_SET (fill, GST_BUFFER_FLAG_GAP);
      /* set discont if it's pending, this is mostly done for the first buffer 
       * and after a flushing seek */
      if (audiorate->discont) {
        GST_BUFFER_FLAG_SET (fill, GST_BUFFER_FLAG_DISCONT);
        audiorate->discont = FALSE;
      }
      gst_buffer_set_caps (fill, GST_PAD_CAPS (audiorate->srcpad));

      ret = gst_pad_push (audiorate->srcpad, fill);
      if (ret != GST_FLOW_OK)
        goto beach;
      audiorate->out++;
      audiorate->add += cursamples;

      if (!audiorate->silent)
        g_object_notify (G_OBJECT (audiorate), "add");
    }

  } else if (in_offset < audiorate->next_offset) {
    /* need to remove samples */
    if (in_offset_end <= audiorate->next_offset) {
      guint64 drop = in_size / audiorate->bytes_per_sample;

      audiorate->drop += drop;

      GST_DEBUG_OBJECT (audiorate, "dropping %lld samples", drop);

      /* we can drop the buffer completely */
      gst_buffer_unref (buf);

      if (!audiorate->silent)
        g_object_notify (G_OBJECT (audiorate), "drop");

//.........这里部分代码省略.........
         * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         * |S| Reserved                    | Sample Length                 |
         * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         * | Sample Timestamp                                              |
         * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         * . Sample Data ...                                               .
         * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         * |S| Reserved                    | Sample Length                 |
         * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         * | Sample Timestamp                                              |
         * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         * . Sample Data ...                                               .
         * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         * . ......                                                        .
         * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         */
        while (payload_len > 8) {
          s = (payload[0] & 0x80) != 0; /* contains sync sample */
          slen = (payload[2] << 8) | payload[3];
          /* timestamp =
           *    (payload[4] << 24) | (payload[5] << 16) | (payload[6] << 8) |
           *    payload[7];
           */

          payload += 8;
          payload_len -= 8;

          if (slen > payload_len)
            slen = payload_len;

          outbuf = gst_buffer_new_and_alloc (slen);
          gst_buffer_fill (outbuf, 0, payload, slen);
          if (!s)
            GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);

          gst_rtp_base_depayload_push (depayload, outbuf);

          /* aligned on 32 bit boundary */
          slen = GST_ROUND_UP_4 (slen);

          payload += slen;
          payload_len -= slen;
        }
        break;
      }
      case 3:
      {
        /* one sample per packet, use adapter to combine based on marker bit. */
        outbuf = gst_buffer_new_and_alloc (payload_len);
        gst_buffer_fill (outbuf, 0, payload, payload_len);

        gst_adapter_push (rtpxqtdepay->adapter, outbuf);
        outbuf = NULL;

        if (!m)
          goto done;

        avail = gst_adapter_available (rtpxqtdepay->adapter);
        outbuf = gst_adapter_take_buffer (rtpxqtdepay->adapter, avail);

        GST_DEBUG_OBJECT (rtpxqtdepay,
            "gst_rtp_xqt_depay_chain: pushing buffer of size %u", avail);

        goto done;
      }
    }

//.........这里部分代码省略.........
    {
        if (av_new_packet(&decoder->packet, GST_BUFFER_SIZE(buf)) == 0)
        {
            memcpy(decoder->packet.data, GST_BUFFER_DATA(buf), GST_BUFFER_SIZE(buf));
            if (GST_BUFFER_TIMESTAMP_IS_VALID(buf))
                base->context->reordered_opaque = GST_BUFFER_TIMESTAMP(buf);
            else
                base->context->reordered_opaque = AV_NOPTS_VALUE;
            num_dec = avcodec_decode_video2(base->context, base->frame, &decoder->frame_finished, &decoder->packet);
            av_free_packet(&decoder->packet);
        }
        else
        {
            result = GST_FLOW_ERROR;
            goto _exit;
        }
    }
    else
    {
        av_init_packet(&decoder->packet);
        decoder->packet.data = GST_BUFFER_DATA(buf);
        decoder->packet.size = GST_BUFFER_SIZE(buf);
        if (GST_BUFFER_TIMESTAMP_IS_VALID(buf))
            base->context->reordered_opaque = GST_BUFFER_TIMESTAMP(buf);
        else
            base->context->reordered_opaque = AV_NOPTS_VALUE;

        num_dec = avcodec_decode_video2(base->context, base->frame, &decoder->frame_finished, &decoder->packet);
    }

    if (num_dec < 0)
    {
        //        basedecoder_flush(base);
#ifdef DEBUG_OUTPUT
        g_print ("videodecoder_chain error: %s\n", avelement_error_to_string(AVELEMENT(decoder), num_dec));
#endif
        goto _exit;
    }

    if (decoder->frame_finished > 0)
    {
        if (!videodecoder_configure_sourcepad(decoder))
            result = GST_FLOW_ERROR;
        else
        {
            GstBuffer *outbuf = NULL;
            result = gst_pad_alloc_buffer_and_set_caps(base->srcpad, base->context->frame_number,
                                                       decoder->frame_size, GST_PAD_CAPS(base->srcpad), &outbuf);
            if (result != GST_FLOW_OK)
            {
                if (result != GST_FLOW_WRONG_STATE)
                {
                    gst_element_message_full(GST_ELEMENT(decoder), GST_MESSAGE_ERROR,
                                             GST_STREAM_ERROR, GST_STREAM_ERROR_DECODE,
                                             ("Decoded video buffer allocation failed"), NULL,
                                             ("videodecoder.c"), ("videodecoder_chain"), 0);
                }
            }
            else
            {
                if (base->frame->reordered_opaque != AV_NOPTS_VALUE)
                {
                    GST_BUFFER_TIMESTAMP(outbuf) = base->frame->reordered_opaque;
                    GST_BUFFER_DURATION(outbuf) = GST_BUFFER_DURATION(buf); // Duration for video usually same
                }
                GST_BUFFER_SIZE(outbuf) = decoder->frame_size;

                // Copy image by parts from different arrays.
                memcpy(GST_BUFFER_DATA(outbuf),                     base->frame->data[0], decoder->u_offset);
                memcpy(GST_BUFFER_DATA(outbuf) + decoder->u_offset, base->frame->data[1], decoder->uv_blocksize);
                memcpy(GST_BUFFER_DATA(outbuf) + decoder->v_offset, base->frame->data[2], decoder->uv_blocksize);

                GST_BUFFER_OFFSET_END(outbuf) = GST_BUFFER_OFFSET_NONE;

                if (decoder->discont || GST_BUFFER_IS_DISCONT(buf))
                {
#ifdef DEBUG_OUTPUT
                    g_print("Video discont: frame size=%dx%d\n", base->context->width, base->context->height);
#endif
                    GST_BUFFER_FLAG_SET(outbuf, GST_BUFFER_FLAG_DISCONT);
                    decoder->discont = FALSE;
                }


#ifdef VERBOSE_DEBUG
                g_print("videodecoder: pushing buffer ts=%.4f sec", (double)GST_BUFFER_TIMESTAMP(outbuf)/GST_SECOND);
#endif
                result = gst_pad_push(base->srcpad, outbuf);
#ifdef VERBOSE_DEBUG
                g_print(" done, res=%s\n", gst_flow_get_name(result));
#endif
            }
        }
    }

_exit:
// INLINE - gst_buffer_unref()
    gst_buffer_unref(buf);
    return result;
}

static GstFlowReturn
gst_jasper_dec_chain (GstPad * pad, GstBuffer * buf)
{
  GstJasperDec *dec;
  GstFlowReturn ret = GST_FLOW_OK;
  GstClockTime ts;
  GstBuffer *outbuf = NULL;
  guint8 *data;
  guint size;
  gboolean decode;

  dec = GST_JASPER_DEC (GST_PAD_PARENT (pad));

  if (dec->fmt < 0)
    goto not_negotiated;

  ts = GST_BUFFER_TIMESTAMP (buf);

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

  if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DISCONT))
    dec->discont = TRUE;

  decode = gst_jasper_dec_do_qos (dec, ts);

  /* FIXME: do clipping */

  if (G_UNLIKELY (!decode)) {
    dec->discont = TRUE;
    goto done;
  }

  /* strip possible prefix */
  if (dec->strip) {
    GstBuffer *tmp;

    tmp = gst_buffer_create_sub (buf, dec->strip,
        GST_BUFFER_SIZE (buf) - dec->strip);
    gst_buffer_copy_metadata (tmp, buf, GST_BUFFER_COPY_TIMESTAMPS);
    gst_buffer_unref (buf);
    buf = tmp;
  }
  /* preprend possible codec_data */
  if (dec->codec_data) {
    GstBuffer *tmp;

    tmp =
        gst_buffer_append (gst_buffer_ref (dec->codec_data),
        gst_buffer_ref (buf));
    gst_buffer_copy_metadata (tmp, buf, GST_BUFFER_COPY_TIMESTAMPS);
    gst_buffer_unref (buf);
    buf = tmp;
  }

  /* now really feed the data to decoder */
  data = GST_BUFFER_DATA (buf);
  size = GST_BUFFER_SIZE (buf);

  ret = gst_jasper_dec_get_picture (dec, data, size, &outbuf);

  if (outbuf) {
    gst_buffer_copy_metadata (outbuf, buf, GST_BUFFER_COPY_TIMESTAMPS);
    if (dec->discont) {
      GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
      dec->discont = FALSE;
    }

    if (ret == GST_FLOW_OK)
      ret = gst_pad_push (dec->srcpad, outbuf);
    else
      gst_buffer_unref (outbuf);
  }

done:
  gst_buffer_unref (buf);

  return ret;

  /* ERRORS */
not_negotiated:
  {
    GST_ELEMENT_ERROR (dec, CORE, NEGOTIATION, (NULL),
        ("format wasn't negotiated before chain function"));
    ret = GST_FLOW_NOT_NEGOTIATED;
    goto done;
  }
}

static GstFlowReturn
gst_vaapidecode_push_decoded_frame (GstVideoDecoder * vdec,
    GstVideoCodecFrame * out_frame)
{
  GstVaapiDecode *const decode = GST_VAAPIDECODE (vdec);
  GstVaapiSurfaceProxy *proxy;
  GstFlowReturn ret;
  const GstVaapiRectangle *crop_rect;
  GstVaapiVideoMeta *meta;
  guint flags, out_flags = 0;

  if (!GST_VIDEO_CODEC_FRAME_IS_DECODE_ONLY (out_frame)) {
    proxy = gst_video_codec_frame_get_user_data (out_frame);

    /* reconfigure if un-cropped surface resolution changed */
    if (is_surface_resolution_changed (vdec, GST_VAAPI_SURFACE_PROXY_SURFACE (proxy)))
      gst_vaapidecode_negotiate (decode);

    gst_vaapi_surface_proxy_set_destroy_notify (proxy,
        (GDestroyNotify) gst_vaapidecode_release, gst_object_ref (decode));

    ret = gst_video_decoder_allocate_output_frame (vdec, out_frame);
    if (ret != GST_FLOW_OK)
      goto error_create_buffer;

    meta = gst_buffer_get_vaapi_video_meta (out_frame->output_buffer);
    if (!meta)
      goto error_get_meta;
    gst_vaapi_video_meta_set_surface_proxy (meta, proxy);

    flags = gst_vaapi_surface_proxy_get_flags (proxy);
    if (flags & GST_VAAPI_SURFACE_PROXY_FLAG_CORRUPTED)
      out_flags |= GST_BUFFER_FLAG_CORRUPTED;
    if (flags & GST_VAAPI_SURFACE_PROXY_FLAG_INTERLACED) {
      out_flags |= GST_VIDEO_BUFFER_FLAG_INTERLACED;
      if (flags & GST_VAAPI_SURFACE_PROXY_FLAG_TFF)
        out_flags |= GST_VIDEO_BUFFER_FLAG_TFF;
      if (flags & GST_VAAPI_SURFACE_PROXY_FLAG_RFF)
        out_flags |= GST_VIDEO_BUFFER_FLAG_RFF;
      if (flags & GST_VAAPI_SURFACE_PROXY_FLAG_ONEFIELD)
        out_flags |= GST_VIDEO_BUFFER_FLAG_ONEFIELD;
    }
    GST_BUFFER_FLAG_SET (out_frame->output_buffer, out_flags);

#if GST_CHECK_VERSION(1,5,0)
    /* First-in-bundle flag only appeared in 1.5 dev */
    if (flags & GST_VAAPI_SURFACE_PROXY_FLAG_FFB) {
      GST_BUFFER_FLAG_SET (out_frame->output_buffer,
          GST_VIDEO_BUFFER_FLAG_FIRST_IN_BUNDLE);
    }
#endif

    crop_rect = gst_vaapi_surface_proxy_get_crop_rect (proxy);
    if (crop_rect) {
      GstVideoCropMeta *const crop_meta =
          gst_buffer_add_video_crop_meta (out_frame->output_buffer);
      if (crop_meta) {
        crop_meta->x = crop_rect->x;
        crop_meta->y = crop_rect->y;
        crop_meta->width = crop_rect->width;
        crop_meta->height = crop_rect->height;
      }
    }
#if (USE_GLX || USE_EGL)
    if (decode->has_texture_upload_meta)
      gst_buffer_ensure_texture_upload_meta (out_frame->output_buffer);
#endif
  }

  ret = gst_video_decoder_finish_frame (vdec, out_frame);
  if (ret != GST_FLOW_OK)
    goto error_commit_buffer;

  gst_video_codec_frame_unref (out_frame);
  return GST_FLOW_OK;

  /* ERRORS */
error_create_buffer:
  {
    const GstVaapiID surface_id =
        gst_vaapi_surface_get_id (GST_VAAPI_SURFACE_PROXY_SURFACE (proxy));

    GST_ELEMENT_ERROR (vdec, STREAM, FAILED,
        ("Failed to create sink buffer"),
        ("video sink failed to create video buffer for proxy'ed "
            "surface %" GST_VAAPI_ID_FORMAT, GST_VAAPI_ID_ARGS (surface_id)));
    gst_video_decoder_drop_frame (vdec, out_frame);
    gst_video_codec_frame_unref (out_frame);
    return GST_FLOW_ERROR;
  }
error_get_meta:
  {
    GST_ELEMENT_ERROR (vdec, STREAM, FAILED,
        ("Failed to get vaapi video meta attached to video buffer"),
        ("Failed to get vaapi video meta attached to video buffer"));
    gst_video_decoder_drop_frame (vdec, out_frame);
    gst_video_codec_frame_unref (out_frame);
    return GST_FLOW_ERROR;
  }
error_commit_buffer:
//.........这里部分代码省略.........