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nvenc: fix high CPU use on initialization of multiple encoders at the same time

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We need a static lock to protect various NVENC methods in _set_format(). Without
this the CPU use increases dramatically on initialisation of the element when
there are multiple elements being initialised at the same time.

https://bugzilla.gnome.org/show_bug.cgi?id=759742
This commit is contained in:
Matthew Marsh 2015-12-22 11:10:31 +02:00 committed by Tim-Philipp Müller
parent a072101441
commit 0e34c02dd6
1 changed files with 12 additions and 0 deletions
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12
sys/nvenc/gstnvbaseenc.c
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@ -70,6 +70,11 @@ enum
PROP_DEVICE_ID,
};
/* This lock is needed to prevent the situation where multiple encoders are
* initialised at the same time which appears to cause excessive CPU usage over
* some period of time. */
G_LOCK_DEFINE_STATIC (initialization_lock);
#if HAVE_NVENC_GST_GL
struct gl_input_resource
{
@ -878,10 +883,14 @@ gst_nv_base_enc_set_format (GstVideoEncoder * enc, GstVideoCodecState * state)
NVENCSTATUS nv_ret;
g_assert (nvenc_class->initialize_encoder);
G_LOCK (initialization_lock);
if (!nvenc_class->initialize_encoder (nvenc, old_state, state)) {
GST_ERROR_OBJECT (enc, "Subclass failed to reconfigure encoder");
G_UNLOCK (initialization_lock);
return FALSE;
}
G_UNLOCK (initialization_lock);
if (!nvenc->max_encode_width && !nvenc->max_encode_height) {
gst_nv_base_enc_set_max_encode_size (nvenc, GST_VIDEO_INFO_WIDTH (info),
@ -1020,7 +1029,10 @@ gst_nv_base_enc_set_format (GstVideoEncoder * enc, GstVideoCodecState * state)
cout_buf.size = 1024 * 1024;
cout_buf.memoryHeap = NV_ENC_MEMORY_HEAP_SYSMEM_CACHED;
G_LOCK (initialization_lock);
nv_ret = NvEncCreateBitstreamBuffer (nvenc->encoder, &cout_buf);
G_UNLOCK (initialization_lock);
if (nv_ret != NV_ENC_SUCCESS) {
GST_WARNING_OBJECT (enc, "Failed to allocate input buffer: %d", nv_ret);
/* FIXME: clean up */