C++ (Cpp) gst_is_v4l2_memory примеры использования

Пример #1

Файл: gstv4l2bufferpool.c Проект: jcaden/gst-plugins-good

static gboolean
gst_v4l2_is_buffer_valid (GstBuffer * buffer, GstV4l2MemoryGroup ** out_group)
{
  GstMemory *mem = gst_buffer_peek_memory (buffer, 0);
  gboolean valid = FALSE;

  if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY))
    goto done;

  if (gst_is_dmabuf_memory (mem))
    mem = gst_mini_object_get_qdata (GST_MINI_OBJECT (mem),
        GST_V4L2_MEMORY_QUARK);

  if (mem && gst_is_v4l2_memory (mem)) {
    GstV4l2Memory *vmem = (GstV4l2Memory *) mem;
    GstV4l2MemoryGroup *group = vmem->group;
    gint i;

    if (group->n_mem != gst_buffer_n_memory (buffer))
      goto done;

    for (i = 0; i < group->n_mem; i++) {
      if (group->mem[i] != gst_buffer_peek_memory (buffer, i))
        goto done;

      if (!gst_memory_is_writable (group->mem[i]))
        goto done;
    }

    valid = TRUE;
    if (out_group)
      *out_group = group;
  }

done:
  return valid;
}

Пример #2

Файл: gstv4l2allocator.c Проект: BigBrother-International/gst-plugins-good

GstV4l2MemoryGroup *
gst_v4l2_allocator_alloc_dmabuf (GstV4l2Allocator * allocator,
    GstAllocator * dmabuf_allocator)
{
  GstV4l2MemoryGroup *group;
  gint i;

  g_return_val_if_fail (allocator->memory == V4L2_MEMORY_MMAP, NULL);

  group = gst_v4l2_allocator_alloc (allocator);

  if (group == NULL)
    return NULL;

  for (i = 0; i < group->n_mem; i++) {
    GstV4l2Memory *mem;
    GstMemory *dma_mem;
    gint dmafd;

    if (group->mem[i] == NULL) {
      struct v4l2_exportbuffer expbuf = { 0 };

      expbuf.type = allocator->type;
      expbuf.index = group->buffer.index;
      expbuf.plane = i;
      expbuf.flags = O_CLOEXEC | O_RDWR;

      if (v4l2_ioctl (allocator->video_fd, VIDIOC_EXPBUF, &expbuf) < 0)
        goto expbuf_failed;

      GST_LOG_OBJECT (allocator, "exported DMABUF as fd %i plane %d",
          expbuf.fd, i);

      group->mem[i] = (GstMemory *) _v4l2mem_new (0, GST_ALLOCATOR (allocator),
          NULL, group->planes[i].length, 0, 0, group->planes[i].length, i,
          NULL, expbuf.fd, group);
    } else {
      /* Take back the allocator reference */
      gst_object_ref (allocator);
    }

    g_assert (gst_is_v4l2_memory (group->mem[i]));
    mem = (GstV4l2Memory *) group->mem[i];

    if ((dmafd = dup (mem->dmafd)) < 0)
      goto dup_failed;

    dma_mem = gst_dmabuf_allocator_alloc (dmabuf_allocator, dmafd,
        mem->mem.maxsize);

    gst_mini_object_set_qdata (GST_MINI_OBJECT (dma_mem),
        GST_V4L2_MEMORY_QUARK, mem, (GDestroyNotify) gst_memory_unref);

    group->mem[i] = dma_mem;
    group->mems_allocated++;
  }

  gst_v4l2_allocator_reset_size (allocator, group);

  return group;

expbuf_failed:
  {
    GST_ERROR_OBJECT (allocator, "Failed to export DMABUF: %s",
        g_strerror (errno));
    goto cleanup;
  }
dup_failed:
  {
    GST_ERROR_OBJECT (allocator, "Failed to dup DMABUF descriptor: %s",
        g_strerror (errno));
    goto cleanup;
  }
cleanup:
  {
    _cleanup_failed_alloc (allocator, group);
    return NULL;
  }
}