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vpxdec: Fix direct rendering, avoid holding write access

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When a buffer is pushed downstream, we should try not to hold the
buffer mapped with write access. Doing so would often lead to
an unneccesary memcpy later.

For instance, gst_buffer_make_writable() in
gst_video_decoder_finish_frame() will cause a memcpy because of
_memory_get_exclusive_reference().

We know that we can perform a two-step remap when using system
memory, as this will not cause the location of the memory to
change.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/812>
This commit is contained in:
Havard Graff 2019-05-22 11:16:56 +02:00 committed by GStreamer Marge Bot
parent 6605174358
commit 068c2a71ba
2 changed files with 14 additions and 0 deletions
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13
ext/vpx/gstvpxdec.c
View file

@ -286,6 +286,7 @@ gst_vpx_dec_start (GstVideoDecoder * decoder)
GST_DEBUG_OBJECT (gst_vpx_dec, "start");
gst_vpx_dec->decoder_inited = FALSE;
gst_vpx_dec->safe_remap = FALSE;
return TRUE;
}
@ -401,6 +402,15 @@ gst_vpx_dec_prepare_image (GstVPXDec * dec, const vpx_image_t * img)
buffer = gst_buffer_ref (frame->buffer);
/* FIXME: an atomic remap would be preferable, for now we simply
* remap the buffer from RW to RO when using a sysmem allocator,
* in order to avoid a useless memcpy in GstVideoDecoder.
*/
if (dec->safe_remap) {
gst_buffer_unmap (buffer, &frame->info);
gst_buffer_map (buffer, &frame->info, GST_MAP_READ);
}
vmeta = gst_buffer_get_video_meta (buffer);
vmeta->format = GST_VIDEO_INFO_FORMAT (info);
vmeta->width = GST_VIDEO_INFO_WIDTH (info);
@ -450,6 +460,9 @@ gst_vpx_dec_get_buffer_cb (gpointer priv, gsize min_size,
allocator = NULL;
}
dec->safe_remap = (allocator == NULL
|| !g_strcmp0 (allocator->mem_type, GST_ALLOCATOR_SYSMEM));
pool = gst_buffer_pool_new ();
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_allocator (config, allocator, &params);

1
ext/vpx/gstvpxdec.h
View file

@ -82,6 +82,7 @@ struct _GstVPXDec
gboolean have_video_meta;
GstBufferPool *pool;
gsize buf_size;
gboolean safe_remap;
};
struct _GstVPXDecClass