Ejemplo n.º 1
0
GstBuffer *
gst_core_media_buffer_new (GstCoreMediaCtx * ctx, CMSampleBufferRef sample_buf)
{
  GstCVApi *cv = ctx->cv;
  GstCMApi *cm = ctx->cm;
  CVImageBufferRef image_buf;
  CVPixelBufferRef pixel_buf;
  CMBlockBufferRef block_buf;
  Byte *data = NULL;
  UInt32 size;
  OSStatus status;
  GstBuffer *buf;
  GstCoreMediaMeta *meta;

  image_buf = cm->CMSampleBufferGetImageBuffer (sample_buf);
  pixel_buf = NULL;
  block_buf = cm->CMSampleBufferGetDataBuffer (sample_buf);

  if (image_buf != NULL &&
      CFGetTypeID (image_buf) == cv->CVPixelBufferGetTypeID ()) {
    pixel_buf = (CVPixelBufferRef) image_buf;

    if (cv->CVPixelBufferLockBaseAddress (pixel_buf,
            kCVPixelBufferLock_ReadOnly) != kCVReturnSuccess) {
      goto error;
    }

    if (cv->CVPixelBufferIsPlanar (pixel_buf)) {
      gint plane_count, plane_idx;

      data = cv->CVPixelBufferGetBaseAddressOfPlane (pixel_buf, 0);

      size = 0;
      plane_count = cv->CVPixelBufferGetPlaneCount (pixel_buf);
      for (plane_idx = 0; plane_idx != plane_count; plane_idx++) {
        size += cv->CVPixelBufferGetBytesPerRowOfPlane (pixel_buf, plane_idx) *
            cv->CVPixelBufferGetHeightOfPlane (pixel_buf, plane_idx);
      }
    } else {
      data = cv->CVPixelBufferGetBaseAddress (pixel_buf);
      size = cv->CVPixelBufferGetBytesPerRow (pixel_buf) *
          cv->CVPixelBufferGetHeight (pixel_buf);
    }
  } else if (block_buf != NULL) {
    status = cm->CMBlockBufferGetDataPointer (block_buf, 0, 0, 0, &data);
    if (status != noErr)
      goto error;
    size = cm->CMBlockBufferGetDataLength (block_buf);
  } else {
    goto error;
  }

  buf = gst_buffer_new ();

  meta = (GstCoreMediaMeta *) gst_buffer_add_meta (buf,
      gst_core_media_meta_get_info (), NULL);
  meta->ctx = g_object_ref (ctx);
  meta->sample_buf = cm->FigSampleBufferRetain (sample_buf);
  meta->image_buf = image_buf;
  meta->pixel_buf = pixel_buf;
  meta->block_buf = block_buf;

  gst_buffer_append_memory (buf,
      gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE, data,
          size, 0, size, NULL, NULL));

  return buf;

error:
  return NULL;
}
GstBuffer *
gst_core_video_buffer_new (GstCoreMediaCtx * ctx, CVBufferRef cvbuf,
    GstVideoInfo * vinfo)
{
  GstCVApi *cv = ctx->cv;
  void *data;
  size_t size;
  CVPixelBufferRef pixbuf = NULL;
  GstBuffer *buf;
  GstCoreVideoMeta *meta;
  guint width, height, n_planes, i;
  gsize offset[GST_VIDEO_MAX_PLANES];
  gint stride[GST_VIDEO_MAX_PLANES];

  if (CFGetTypeID (cvbuf) != cv->CVPixelBufferGetTypeID ())
    /* TODO: Do we need to handle other buffer types? */
    goto error;

  pixbuf = (CVPixelBufferRef) cvbuf;

  if (cv->CVPixelBufferLockBaseAddress (pixbuf,
          kCVPixelBufferLock_ReadOnly) != kCVReturnSuccess) {
    goto error;
  }

  buf = gst_buffer_new ();

  /* add the corevideo meta to free the underlying corevideo buffer */
  meta = (GstCoreVideoMeta *) gst_buffer_add_meta (buf,
      gst_core_video_meta_get_info (), NULL);
  meta->ctx = g_object_ref (ctx);
  meta->cvbuf = cv->CVBufferRetain (cvbuf);
  meta->pixbuf = pixbuf;

  /* set stride, offset and size */
  memset (&offset, 0, sizeof (offset));
  memset (&stride, 0, sizeof (stride));

  data = cv->CVPixelBufferGetBaseAddress (pixbuf);
  height = cv->CVPixelBufferGetHeight (pixbuf);
  if (cv->CVPixelBufferIsPlanar (pixbuf)) {
    GstVideoInfo tmp_vinfo;

    n_planes = cv->CVPixelBufferGetPlaneCount (pixbuf);
    for (i = 0; i < n_planes; ++i)
      stride[i] = cv->CVPixelBufferGetBytesPerRowOfPlane (pixbuf, i);

    /* FIXME: don't hardcode NV12 */
    gst_video_info_init (&tmp_vinfo);
    gst_video_info_set_format (&tmp_vinfo,
        GST_VIDEO_FORMAT_NV12, stride[0], height);
    offset[1] = tmp_vinfo.offset[1];
    size = tmp_vinfo.size;
  } else {
    n_planes = 1;
    size = cv->CVPixelBufferGetBytesPerRow (pixbuf) * height;
  }

  gst_buffer_append_memory (buf,
      gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE, data,
          size, 0, size, NULL, NULL));

  if (vinfo) {
    GstVideoMeta *video_meta;

    width = vinfo->width;
    video_meta =
        gst_buffer_add_video_meta_full (buf, GST_VIDEO_FRAME_FLAG_NONE,
        GST_VIDEO_FORMAT_NV12, width, height, n_planes, offset, stride);
  }

  return buf;

error:
  return NULL;
}