C++ (Cpp) gst_gl_base_memory_alloc_data示例

示例#1

文件： gstglbasememory.c 项目： asrashley/gst-plugins-bad

/**
 * gst_gl_base_memory_memcpy:
 * @src: the source #GstGLBaseMemory
 * @dest: the destination #GstGLBaseMemory
 * @offset: the offset to start at
 * @size: the number of bytes to copy
 *
 * Returns: whether the copy suceeded.
 */
gboolean
gst_gl_base_memory_memcpy (GstGLBaseMemory * src, GstGLBaseMemory * dest,
    gssize offset, gssize size)
{
  GstMapInfo sinfo, dinfo;

  if (!gst_gl_base_memory_alloc_data (GST_GL_BASE_MEMORY_CAST (dest)))
    return FALSE;

  if (!gst_memory_map ((GstMemory *) src, &sinfo, GST_MAP_READ)) {
    GST_CAT_WARNING (GST_CAT_GL_BASE_MEMORY,
        "could not read map source memory %p", src);
    return FALSE;
  }

  if (!gst_memory_map ((GstMemory *) dest, &dinfo, GST_MAP_WRITE)) {
    GST_CAT_WARNING (GST_CAT_GL_BASE_MEMORY,
        "could not write map dest memory %p", dest);
    gst_memory_unmap ((GstMemory *) src, &sinfo);
    return FALSE;
  }

  if (size == -1)
    size = sinfo.size > offset ? sinfo.size - offset : 0;

  GST_CAT_DEBUG (GST_CAT_GL_BASE_MEMORY,
      "memcpy %" G_GSSIZE_FORMAT " memory %p -> %p", size, src, dest);
  memcpy (dinfo.data, sinfo.data + offset, size);
  gst_memory_unmap ((GstMemory *) dest, &dinfo);
  gst_memory_unmap ((GstMemory *) src, &sinfo);

  return TRUE;
}

示例#2

文件： gstglbuffer.c 项目： GrokImageCompression/gst-plugins-bad

static gpointer
gst_gl_buffer_cpu_access (GstGLBuffer * mem, GstMapInfo * info, gsize size)
{
  const GstGLFuncs *gl = mem->mem.context->gl_vtable;
  gpointer data, ret;

  if (!gst_gl_base_memory_alloc_data (GST_GL_BASE_MEMORY_CAST (mem)))
    return NULL;

  ret = mem->mem.data;

  GST_CAT_LOG (GST_CAT_GL_BUFFER, "mapping id %d size %" G_GSIZE_FORMAT,
      mem->id, size);

  /* The extra data pointer indirection/memcpy is needed for coherent across
   * concurrent map()'s in both GL and CPU */
  if (GST_MEMORY_FLAG_IS_SET (mem, GST_GL_BASE_MEMORY_TRANSFER_NEED_DOWNLOAD)
      && (info->flags & GST_MAP_GL) == 0 && (info->flags & GST_MAP_READ) != 0) {
    gl->BindBuffer (mem->target, mem->id);

    if (gl->MapBufferRange) {
      /* FIXME: optionally remove this with a flag and return the
       * glMapBufferRange pointer (requires
       * GL_ARB_buffer_storage/GL4/GL_COHERENT_BIT) */
      guint gl_map_flags = GL_MAP_READ_BIT;

      data = gl->MapBufferRange (mem->target, 0, size, gl_map_flags);

      if (data)
        memcpy (mem->mem.data, data, size);

      gl->UnmapBuffer (mem->target);
      ret = mem->mem.data;
    } else if (gl->GetBufferSubData) {
      gl->GetBufferSubData (mem->target, 0, size, mem->mem.data);
      ret = mem->mem.data;
    } else {
      ret = NULL;
    }
    gl->BindBuffer (mem->target, 0);
  }

  return ret;
}

示例#3

文件： gstglmemorypbo.c 项目： Haifen/gst-plugins-bad

static gpointer
_gl_mem_map_cpu_access (GstGLMemoryPBO * gl_mem, GstMapInfo * info, gsize size)
{
  gpointer data = NULL;

  gst_gl_base_memory_alloc_data ((GstGLBaseMemory *) gl_mem);

  if (!data && gl_mem->pbo
      && CONTEXT_SUPPORTS_PBO_DOWNLOAD (gl_mem->mem.mem.context))
    data = _pbo_download_transfer (gl_mem, info, size);

  if (!data) {
    GstGLMemoryAllocatorClass *alloc_class;

    alloc_class = GST_GL_MEMORY_ALLOCATOR_CLASS (parent_class);

    data = alloc_class->map ((GstGLBaseMemory *) gl_mem, info, size);
  }

  return data;
}