C++ (Cpp) GST_BASE_VIDEO_DECODER_GET_CLASS Exemples

Exemple #1

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Fichier : gstbasevideodecoder.c Projet : PeterXu/gst-mobile

void
gst_base_video_decoder_skip_frame (GstBaseVideoDecoder * base_video_decoder,
    GstVideoFrame * frame)
{
  GstBaseVideoDecoderClass *base_video_decoder_class;

  GstClockTime presentation_timestamp;
  GstClockTime presentation_duration;

  GST_DEBUG ("skip frame");

  base_video_decoder_class =
      GST_BASE_VIDEO_DECODER_GET_CLASS (base_video_decoder);

  gst_base_video_decoder_calculate_timestamps (base_video_decoder, frame,
      &presentation_timestamp, &presentation_duration);

  GST_DEBUG ("skipping frame %" GST_TIME_FORMAT,
      GST_TIME_ARGS (presentation_timestamp));

  gst_video_frame_unref (frame);
}

Exemple #2

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Fichier : gstbasevideodecoder.c Projet : PeterXu/gst-mobile

static gboolean
gst_base_video_decoder_sink_setcaps (GstPad * pad, GstCaps * caps)
{
  GstBaseVideoDecoder *base_video_decoder;
  GstBaseVideoDecoderClass *base_video_decoder_class;
  GstStructure *structure;
  const GValue *codec_data;
  GstVideoState *state;
  gboolean ret = TRUE;

  base_video_decoder = GST_BASE_VIDEO_DECODER (gst_pad_get_parent (pad));
  base_video_decoder_class =
      GST_BASE_VIDEO_DECODER_GET_CLASS (base_video_decoder);

  GST_DEBUG ("setcaps %" GST_PTR_FORMAT, caps);

  state = &base_video_decoder->state;

  gst_base_video_decoder_reset_state (state);

  structure = gst_caps_get_structure (caps, 0);

  gst_video_format_parse_caps (caps, NULL, &state->width, &state->height);
  gst_video_parse_caps_framerate (caps, &state->fps_n, &state->fps_d);
  gst_video_parse_caps_pixel_aspect_ratio (caps, &state->par_n, &state->par_d);
  gst_structure_get_boolean (structure, "interlaced", &state->interlaced);

  codec_data = gst_structure_get_value (structure, "codec_data");
  if (codec_data && G_VALUE_TYPE (codec_data) == GST_TYPE_BUFFER)
    state->codec_data = gst_value_get_buffer (codec_data);

  if (base_video_decoder_class->set_sink_caps)
    ret = base_video_decoder_class->set_sink_caps (base_video_decoder, caps);

  g_object_unref (base_video_decoder);

  return ret;
}

Exemple #3

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Fichier : gstbasevideodecoder.c Projet : zsx/ossbuild

GstFlowReturn
gst_base_video_decoder_finish_frame (GstBaseVideoDecoder * base_video_decoder,
    GstVideoFrame * frame)
{
  GstBaseVideoDecoderClass *base_video_decoder_class;
  GstBuffer *src_buffer;

  GST_DEBUG ("finish frame");

  base_video_decoder_class =
      GST_BASE_VIDEO_DECODER_GET_CLASS (base_video_decoder);

  GST_DEBUG ("finish frame sync=%d pts=%" G_GINT64_FORMAT, frame->is_sync_point,
      frame->presentation_timestamp);

  if (frame->is_sync_point) {
    if (GST_CLOCK_TIME_IS_VALID (frame->presentation_timestamp)) {
      if (frame->presentation_timestamp != base_video_decoder->timestamp_offset) {
        GST_DEBUG ("sync timestamp %" G_GINT64_FORMAT " diff %" G_GINT64_FORMAT,
            frame->presentation_timestamp,
            frame->presentation_timestamp -
            base_video_decoder->state.segment.start);
        base_video_decoder->timestamp_offset = frame->presentation_timestamp;
        base_video_decoder->field_index = 0;
      } else {
        /* This case is for one initial timestamp and no others, e.g.,
         * filesrc ! decoder ! xvimagesink */
        GST_WARNING ("sync timestamp didn't change, ignoring");
        frame->presentation_timestamp = GST_CLOCK_TIME_NONE;
      }
    } else {
      GST_WARNING ("sync point doesn't have timestamp");
      if (GST_CLOCK_TIME_IS_VALID (base_video_decoder->timestamp_offset)) {
        GST_ERROR ("No base timestamp.  Assuming frames start at 0");
        base_video_decoder->timestamp_offset = 0;
        base_video_decoder->field_index = 0;
      }
    }
  }
  frame->field_index = base_video_decoder->field_index;
  base_video_decoder->field_index += frame->n_fields;

  if (frame->presentation_timestamp == GST_CLOCK_TIME_NONE) {
    frame->presentation_timestamp =
        gst_base_video_decoder_get_field_timestamp (base_video_decoder,
        frame->field_index);
    frame->presentation_duration = GST_CLOCK_TIME_NONE;
    frame->decode_timestamp =
        gst_base_video_decoder_get_timestamp (base_video_decoder,
        frame->decode_frame_number);
  }
  if (frame->presentation_duration == GST_CLOCK_TIME_NONE) {
    frame->presentation_duration =
        gst_base_video_decoder_get_field_timestamp (base_video_decoder,
        frame->field_index + frame->n_fields) - frame->presentation_timestamp;
  }

  if (GST_CLOCK_TIME_IS_VALID (base_video_decoder->last_timestamp)) {
    if (frame->presentation_timestamp < base_video_decoder->last_timestamp) {
      GST_WARNING ("decreasing timestamp (%" G_GINT64_FORMAT " < %"
          G_GINT64_FORMAT ")", frame->presentation_timestamp,
          base_video_decoder->last_timestamp);
    }
  }
  base_video_decoder->last_timestamp = frame->presentation_timestamp;

  GST_BUFFER_FLAG_UNSET (frame->src_buffer, GST_BUFFER_FLAG_DELTA_UNIT);
  if (base_video_decoder->state.interlaced) {
#ifndef GST_VIDEO_BUFFER_TFF
#define GST_VIDEO_BUFFER_TFF (GST_MINI_OBJECT_FLAG_LAST << 5)
#endif
#ifndef GST_VIDEO_BUFFER_RFF
#define GST_VIDEO_BUFFER_RFF (GST_MINI_OBJECT_FLAG_LAST << 6)
#endif
#ifndef GST_VIDEO_BUFFER_ONEFIELD
#define GST_VIDEO_BUFFER_ONEFIELD (GST_MINI_OBJECT_FLAG_LAST << 7)
#endif
    int tff = base_video_decoder->state.top_field_first;

    if (frame->field_index & 1) {
      tff ^= 1;
    }
    if (tff) {
      GST_BUFFER_FLAG_SET (frame->src_buffer, GST_VIDEO_BUFFER_TFF);
    } else {
      GST_BUFFER_FLAG_UNSET (frame->src_buffer, GST_VIDEO_BUFFER_TFF);
    }
    GST_BUFFER_FLAG_UNSET (frame->src_buffer, GST_VIDEO_BUFFER_RFF);
    GST_BUFFER_FLAG_UNSET (frame->src_buffer, GST_VIDEO_BUFFER_ONEFIELD);
    if (frame->n_fields == 3) {
      GST_BUFFER_FLAG_SET (frame->src_buffer, GST_VIDEO_BUFFER_RFF);
    } else if (frame->n_fields == 1) {
      GST_BUFFER_FLAG_UNSET (frame->src_buffer, GST_VIDEO_BUFFER_ONEFIELD);
    }
  }

  GST_BUFFER_TIMESTAMP (frame->src_buffer) = frame->presentation_timestamp;
  GST_BUFFER_DURATION (frame->src_buffer) = frame->presentation_duration;
  GST_BUFFER_OFFSET (frame->src_buffer) = -1;
  GST_BUFFER_OFFSET_END (frame->src_buffer) = -1;

  GST_DEBUG ("pushing frame %" G_GINT64_FORMAT, frame->presentation_timestamp);

  base_video_decoder->frames =
      g_list_remove (base_video_decoder->frames, frame);

  gst_base_video_decoder_set_src_caps (base_video_decoder);

  src_buffer = frame->src_buffer;
  frame->src_buffer = NULL;

  gst_base_video_decoder_free_frame (frame);

  if (base_video_decoder->sink_clipping) {
    gint64 start = GST_BUFFER_TIMESTAMP (src_buffer);
    gint64 stop = GST_BUFFER_TIMESTAMP (src_buffer) +
        GST_BUFFER_DURATION (src_buffer);

    if (gst_segment_clip (&base_video_decoder->state.segment, GST_FORMAT_TIME,
            start, stop, &start, &stop)) {
      GST_BUFFER_TIMESTAMP (src_buffer) = start;
      GST_BUFFER_DURATION (src_buffer) = stop - start;
    } else {
      GST_DEBUG ("dropping buffer outside segment");
      gst_buffer_unref (src_buffer);
      return GST_FLOW_OK;
    }
  }

  return gst_pad_push (GST_BASE_VIDEO_CODEC_SRC_PAD (base_video_decoder),
      src_buffer);
}

Exemple #4

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Fichier : gstbasevideodecoder.c Projet : zsx/ossbuild

static GstFlowReturn
gst_base_video_decoder_chain (GstPad * pad, GstBuffer * buf)
{
  GstBaseVideoDecoder *base_video_decoder;
  GstBaseVideoDecoderClass *klass;
  GstBuffer *buffer;
  GstFlowReturn ret;

  GST_DEBUG ("chain %" G_GINT64_FORMAT, GST_BUFFER_TIMESTAMP (buf));

#if 0
  /* requiring the pad to be negotiated makes it impossible to use
   * oggdemux or filesrc ! decoder */
  if (!gst_pad_is_negotiated (pad)) {
    GST_DEBUG ("not negotiated");
    return GST_FLOW_NOT_NEGOTIATED;
  }
#endif

  base_video_decoder = GST_BASE_VIDEO_DECODER (gst_pad_get_parent (pad));
  klass = GST_BASE_VIDEO_DECODER_GET_CLASS (base_video_decoder);

  GST_DEBUG_OBJECT (base_video_decoder, "chain");

  if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DISCONT))) {
    GST_DEBUG_OBJECT (base_video_decoder, "received DISCONT buffer");
    if (base_video_decoder->started) {
      gst_base_video_decoder_reset (base_video_decoder);
    }
  }

  if (!base_video_decoder->started) {
    klass->start (base_video_decoder);
    base_video_decoder->started = TRUE;
  }

  if (GST_BUFFER_TIMESTAMP (buf) != GST_CLOCK_TIME_NONE) {
    GST_DEBUG ("timestamp %" G_GINT64_FORMAT " offset %" G_GINT64_FORMAT,
        GST_BUFFER_TIMESTAMP (buf), base_video_decoder->offset);
    base_video_decoder->last_sink_timestamp = GST_BUFFER_TIMESTAMP (buf);
  }
  if (GST_BUFFER_OFFSET_END (buf) != -1) {
    GST_DEBUG ("gp %" G_GINT64_FORMAT, GST_BUFFER_OFFSET_END (buf));
    base_video_decoder->last_sink_offset_end = GST_BUFFER_OFFSET_END (buf);
  }
  base_video_decoder->offset += GST_BUFFER_SIZE (buf);

#if 0
  if (base_video_decoder->timestamp_offset == GST_CLOCK_TIME_NONE &&
      GST_BUFFER_TIMESTAMP (buf) != GST_CLOCK_TIME_NONE) {
    GST_DEBUG ("got new offset %lld", GST_BUFFER_TIMESTAMP (buf));
    base_video_decoder->timestamp_offset = GST_BUFFER_TIMESTAMP (buf);
  }
#endif

  if (base_video_decoder->current_frame == NULL) {
    base_video_decoder->current_frame =
        gst_base_video_decoder_new_frame (base_video_decoder);
  }

  gst_adapter_push (base_video_decoder->input_adapter, buf);

  if (!base_video_decoder->have_sync) {
    int n, m;

    GST_DEBUG ("no sync, scanning");

    n = gst_adapter_available (base_video_decoder->input_adapter);
    m = klass->scan_for_sync (base_video_decoder, FALSE, 0, n);

    if (m < 0) {
      g_warning ("subclass returned negative scan %d", m);
    }

    if (m >= n) {
      g_warning ("subclass scanned past end %d >= %d", m, n);
    }

    gst_adapter_flush (base_video_decoder->input_adapter, m);

    if (m < n) {
      GST_DEBUG ("found possible sync after %d bytes (of %d)", m, n);

      /* this is only "maybe" sync */
      base_video_decoder->have_sync = TRUE;
    }

    if (!base_video_decoder->have_sync) {
      gst_object_unref (base_video_decoder);
      return GST_FLOW_OK;
    }
  }

  /* FIXME: use gst_adapter_prev_timestamp() here instead? */
  buffer = gst_adapter_get_buffer (base_video_decoder->input_adapter);

  base_video_decoder->buffer_timestamp = GST_BUFFER_TIMESTAMP (buffer);
  gst_buffer_unref (buffer);

  do {
    ret = klass->parse_data (base_video_decoder, FALSE);
  } while (ret == GST_FLOW_OK);

  if (ret == GST_BASE_VIDEO_DECODER_FLOW_NEED_DATA) {
    gst_object_unref (base_video_decoder);
    return GST_FLOW_OK;
  }

  gst_object_unref (base_video_decoder);
  return ret;
}

Exemple #5

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Fichier : gstbasevideodecoder.c Projet : zsx/ossbuild

static gboolean
gst_base_video_decoder_sink_event (GstPad * pad, GstEvent * event)
{
  GstBaseVideoDecoder *base_video_decoder;
  GstBaseVideoDecoderClass *base_video_decoder_class;
  gboolean ret = FALSE;

  base_video_decoder = GST_BASE_VIDEO_DECODER (gst_pad_get_parent (pad));
  base_video_decoder_class =
      GST_BASE_VIDEO_DECODER_GET_CLASS (base_video_decoder);

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_EOS:
    {
      GstVideoFrame *frame;

      frame = g_malloc0 (sizeof (GstVideoFrame));
      frame->presentation_frame_number =
          base_video_decoder->presentation_frame_number;
      frame->presentation_duration = 0;
      base_video_decoder->presentation_frame_number++;

      base_video_decoder->frames =
          g_list_append (base_video_decoder->frames, frame);
      if (base_video_decoder_class->finish) {
        base_video_decoder_class->finish (base_video_decoder, frame);
      }

      ret =
          gst_pad_push_event (GST_BASE_VIDEO_CODEC_SRC_PAD (base_video_decoder),
          event);
    }
      break;
    case GST_EVENT_NEWSEGMENT:
    {
      gboolean update;
      double rate;
      double applied_rate;
      GstFormat format;
      gint64 start;
      gint64 stop;
      gint64 position;

      gst_event_parse_new_segment_full (event, &update, &rate,
          &applied_rate, &format, &start, &stop, &position);

      if (format != GST_FORMAT_TIME)
        goto newseg_wrong_format;

      gst_segment_set_newsegment_full (&base_video_decoder->state.segment,
          update, rate, applied_rate, format, start, stop, position);
      GST_DEBUG ("new segment %" GST_SEGMENT_FORMAT,
          &base_video_decoder->state.segment);

      ret =
          gst_pad_push_event (GST_BASE_VIDEO_CODEC_SRC_PAD (base_video_decoder),
          event);
    }
      break;
    default:
      /* FIXME this changes the order of events */
      ret =
          gst_pad_push_event (GST_BASE_VIDEO_CODEC_SRC_PAD (base_video_decoder),
          event);
      break;
  }

done:
  gst_object_unref (base_video_decoder);
  return ret;

newseg_wrong_format:
  {
    GST_DEBUG_OBJECT (base_video_decoder, "received non TIME newsegment");
    gst_event_unref (event);
    goto done;
  }
}

Exemple #6

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Fichier : gstbasevideodecoder.c Projet : zsx/ossbuild

GstFlowReturn
gst_base_video_decoder_have_frame (GstBaseVideoDecoder * base_video_decoder)
{
  GstVideoFrame *frame = base_video_decoder->current_frame;
  GstBuffer *buffer;
  GstBaseVideoDecoderClass *base_video_decoder_class;
  GstFlowReturn ret = GST_FLOW_OK;
  int n_available;

  GST_DEBUG ("have_frame");

  base_video_decoder_class =
      GST_BASE_VIDEO_DECODER_GET_CLASS (base_video_decoder);

  n_available = gst_adapter_available (base_video_decoder->output_adapter);
  if (n_available) {
    buffer = gst_adapter_take_buffer (base_video_decoder->output_adapter,
        n_available);
  } else {
    buffer = gst_buffer_new_and_alloc (0);
  }

  frame->distance_from_sync = base_video_decoder->distance_from_sync;
  base_video_decoder->distance_from_sync++;

#if 0
  if (frame->presentation_timestamp == GST_CLOCK_TIME_NONE) {
    frame->presentation_timestamp =
        gst_base_video_decoder_get_timestamp (base_video_decoder,
        frame->presentation_frame_number);
    frame->presentation_duration =
        gst_base_video_decoder_get_timestamp (base_video_decoder,
        frame->presentation_frame_number + 1) - frame->presentation_timestamp;
    frame->decode_timestamp =
        gst_base_video_decoder_get_timestamp (base_video_decoder,
        frame->decode_frame_number);
  }
#endif

#if 0
  GST_BUFFER_TIMESTAMP (buffer) = frame->presentation_timestamp;
  GST_BUFFER_DURATION (buffer) = frame->presentation_duration;
  if (frame->decode_frame_number < 0) {
    GST_BUFFER_OFFSET (buffer) = 0;
  } else {
    GST_BUFFER_OFFSET (buffer) = frame->decode_timestamp;
  }
  GST_BUFFER_OFFSET_END (buffer) = GST_CLOCK_TIME_NONE;
#endif

  GST_DEBUG ("pts %" GST_TIME_FORMAT,
      GST_TIME_ARGS (frame->presentation_timestamp));
  GST_DEBUG ("dts %" GST_TIME_FORMAT, GST_TIME_ARGS (frame->decode_timestamp));
  GST_DEBUG ("dist %d", frame->distance_from_sync);

  if (frame->is_sync_point) {
    GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
  } else {
    GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
  }
  if (base_video_decoder->discont) {
    GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
    base_video_decoder->discont = FALSE;
  }

  frame->sink_buffer = buffer;

  base_video_decoder->frames = g_list_append (base_video_decoder->frames,
      frame);

  /* do something with frame */
  ret = base_video_decoder_class->handle_frame (base_video_decoder, frame);
  if (!GST_FLOW_IS_SUCCESS (ret)) {
    GST_DEBUG ("flow error!");
  }

  /* create new frame */
  base_video_decoder->current_frame =
      gst_base_video_decoder_new_frame (base_video_decoder);

  return ret;
}

Exemple #7

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