gstreamer/gst/vaapi/gstvaapiencode.c
Víctor Manuel Jáquez Leal 1c722efe54 Remove old gst version guards
As gstreamer-vaapi now only supports from GStreamer 1.6, this patch removes
all the old GStreamer version guards.

Signed-off-by: Víctor Manuel Jáquez Leal <victorx.jaquez@intel.com>
2016-01-25 12:09:40 +00:00

716 lines
20 KiB
C

/*
* gstvaapiencode.c - VA-API video encoder
*
* Copyright (C) 2013-2014 Intel Corporation
* Author: Wind Yuan <feng.yuan@intel.com>
* Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#include "gstcompat.h"
#include <gst/vaapi/gstvaapivalue.h>
#include <gst/vaapi/gstvaapidisplay.h>
#include "gstvaapiencode.h"
#include "gstvaapipluginutil.h"
#include "gstvaapivideometa.h"
#include "gstvaapivideomemory.h"
#include "gstvaapivideobufferpool.h"
#define GST_PLUGIN_NAME "vaapiencode"
#define GST_PLUGIN_DESC "A VA-API based video encoder"
#define GST_VAAPI_ENCODE_FLOW_TIMEOUT GST_FLOW_CUSTOM_SUCCESS
#define GST_VAAPI_ENCODE_FLOW_MEM_ERROR GST_FLOW_CUSTOM_ERROR
#define GST_VAAPI_ENCODE_FLOW_CONVERT_ERROR GST_FLOW_CUSTOM_ERROR_1
GST_DEBUG_CATEGORY_STATIC (gst_vaapiencode_debug);
#define GST_CAT_DEFAULT gst_vaapiencode_debug
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstVaapiEncode,
gst_vaapiencode, GST_TYPE_VIDEO_ENCODER,
GST_VAAPI_PLUGIN_BASE_INIT_INTERFACES);
enum
{
PROP_0,
PROP_BASE,
};
static inline gboolean
ensure_display (GstVaapiEncode * encode)
{
return gst_vaapi_plugin_base_ensure_display (GST_VAAPI_PLUGIN_BASE (encode));
}
static gboolean
gst_vaapiencode_sink_query (GstVideoEncoder * encoder, GstQuery * query)
{
gboolean ret = TRUE;
GstVaapiPluginBase *const plugin = GST_VAAPI_PLUGIN_BASE (encoder);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONTEXT:
ret = gst_vaapi_handle_context_query (query, plugin->display);
break;
default:
ret = GST_VIDEO_ENCODER_CLASS (gst_vaapiencode_parent_class)->sink_query
(encoder, query);
break;
}
return ret;
}
static gboolean
gst_vaapiencode_src_query (GstVideoEncoder * encoder, GstQuery * query)
{
gboolean ret = TRUE;
GstVaapiPluginBase *const plugin = GST_VAAPI_PLUGIN_BASE (encoder);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONTEXT:
ret = gst_vaapi_handle_context_query (query, plugin->display);
break;
default:
ret = GST_VIDEO_ENCODER_CLASS (gst_vaapiencode_parent_class)->src_query
(encoder, query);
break;
}
return ret;
}
typedef struct
{
GstVaapiEncoderProp id;
GParamSpec *pspec;
GValue value;
} PropValue;
static PropValue *
prop_value_new (GstVaapiEncoderPropInfo * prop)
{
static const GValue default_value = G_VALUE_INIT;
PropValue *prop_value;
if (!prop || !prop->pspec)
return NULL;
prop_value = g_slice_new (PropValue);
if (!prop_value)
return NULL;
prop_value->id = prop->prop;
prop_value->pspec = g_param_spec_ref (prop->pspec);
memcpy (&prop_value->value, &default_value, sizeof (prop_value->value));
g_value_init (&prop_value->value, prop->pspec->value_type);
g_param_value_set_default (prop->pspec, &prop_value->value);
return prop_value;
}
static void
prop_value_free (PropValue * prop_value)
{
if (!prop_value)
return;
if (G_VALUE_TYPE (&prop_value->value))
g_value_unset (&prop_value->value);
if (prop_value->pspec) {
g_param_spec_unref (prop_value->pspec);
prop_value->pspec = NULL;
}
g_slice_free (PropValue, prop_value);
}
static inline PropValue *
prop_value_lookup (GstVaapiEncode * encode, guint prop_id)
{
GPtrArray *const prop_values = encode->prop_values;
if (prop_values &&
(prop_id >= PROP_BASE && prop_id < PROP_BASE + prop_values->len))
return g_ptr_array_index (prop_values, prop_id - PROP_BASE);
return NULL;
}
static gboolean
gst_vaapiencode_default_get_property (GstVaapiEncode * encode, guint prop_id,
GValue * value)
{
PropValue *const prop_value = prop_value_lookup (encode, prop_id);
if (prop_value) {
g_value_copy (&prop_value->value, value);
return TRUE;
}
return FALSE;
}
static gboolean
gst_vaapiencode_default_set_property (GstVaapiEncode * encode, guint prop_id,
const GValue * value)
{
PropValue *const prop_value = prop_value_lookup (encode, prop_id);
if (prop_value) {
g_value_copy (value, &prop_value->value);
return TRUE;
}
return FALSE;
}
static GstFlowReturn
gst_vaapiencode_default_alloc_buffer (GstVaapiEncode * encode,
GstVaapiCodedBuffer * coded_buf, GstBuffer ** outbuf_ptr)
{
GstBuffer *buf;
gint32 buf_size;
g_return_val_if_fail (coded_buf != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (outbuf_ptr != NULL, GST_FLOW_ERROR);
buf_size = gst_vaapi_coded_buffer_get_size (coded_buf);
if (buf_size <= 0)
goto error_invalid_buffer;
buf =
gst_video_encoder_allocate_output_buffer (GST_VIDEO_ENCODER_CAST (encode),
buf_size);
if (!buf)
goto error_create_buffer;
if (!gst_vaapi_coded_buffer_copy_into (buf, coded_buf))
goto error_copy_buffer;
*outbuf_ptr = buf;
return GST_FLOW_OK;
/* ERRORS */
error_invalid_buffer:
{
GST_ERROR ("invalid GstVaapiCodedBuffer size (%d bytes)", buf_size);
return GST_VAAPI_ENCODE_FLOW_MEM_ERROR;
}
error_create_buffer:
{
GST_ERROR ("failed to create output buffer of size %d", buf_size);
return GST_VAAPI_ENCODE_FLOW_MEM_ERROR;
}
error_copy_buffer:
{
GST_ERROR ("failed to copy GstVaapiCodedBuffer data");
gst_buffer_unref (buf);
return GST_VAAPI_ENCODE_FLOW_MEM_ERROR;
}
}
static gboolean
ensure_output_state (GstVaapiEncode * encode)
{
GstVideoEncoder *const venc = GST_VIDEO_ENCODER_CAST (encode);
GstVaapiEncodeClass *const klass = GST_VAAPIENCODE_GET_CLASS (encode);
GstVaapiEncoderStatus status;
GstCaps *out_caps;
if (!encode->input_state_changed)
return TRUE;
out_caps = klass->get_caps (encode);
if (!out_caps)
return FALSE;
if (encode->output_state)
gst_video_codec_state_unref (encode->output_state);
encode->output_state = gst_video_encoder_set_output_state (venc, out_caps,
encode->input_state);
if (encode->need_codec_data) {
status = gst_vaapi_encoder_get_codec_data (encode->encoder,
&encode->output_state->codec_data);
if (status != GST_VAAPI_ENCODER_STATUS_SUCCESS)
return FALSE;
}
if (!gst_video_encoder_negotiate (venc))
return FALSE;
encode->input_state_changed = FALSE;
return TRUE;
}
static GstFlowReturn
gst_vaapiencode_push_frame (GstVaapiEncode * encode, gint64 timeout)
{
GstVideoEncoder *const venc = GST_VIDEO_ENCODER_CAST (encode);
GstVaapiEncodeClass *const klass = GST_VAAPIENCODE_GET_CLASS (encode);
GstVideoCodecFrame *out_frame;
GstVaapiCodedBufferProxy *codedbuf_proxy = NULL;
GstVaapiEncoderStatus status;
GstBuffer *out_buffer;
GstFlowReturn ret;
status = gst_vaapi_encoder_get_buffer_with_timeout (encode->encoder,
&codedbuf_proxy, timeout);
if (status == GST_VAAPI_ENCODER_STATUS_NO_BUFFER)
return GST_VAAPI_ENCODE_FLOW_TIMEOUT;
if (status != GST_VAAPI_ENCODER_STATUS_SUCCESS)
goto error_get_buffer;
out_frame = gst_vaapi_coded_buffer_proxy_get_user_data (codedbuf_proxy);
if (!out_frame)
goto error_get_buffer;
gst_video_codec_frame_ref (out_frame);
gst_video_codec_frame_set_user_data (out_frame, NULL, NULL);
/* Update output state */
GST_VIDEO_ENCODER_STREAM_LOCK (encode);
if (!ensure_output_state (encode))
goto error_output_state;
GST_VIDEO_ENCODER_STREAM_UNLOCK (encode);
/* Allocate and copy buffer into system memory */
out_buffer = NULL;
ret = klass->alloc_buffer (encode,
GST_VAAPI_CODED_BUFFER_PROXY_BUFFER (codedbuf_proxy), &out_buffer);
gst_vaapi_coded_buffer_proxy_replace (&codedbuf_proxy, NULL);
if (ret != GST_FLOW_OK)
goto error_allocate_buffer;
gst_buffer_replace (&out_frame->output_buffer, out_buffer);
gst_buffer_unref (out_buffer);
GST_DEBUG ("output:%" GST_TIME_FORMAT ", size:%zu",
GST_TIME_ARGS (out_frame->pts), gst_buffer_get_size (out_buffer));
return gst_video_encoder_finish_frame (venc, out_frame);
/* ERRORS */
error_get_buffer:
{
GST_ERROR ("failed to get encoded buffer (status %d)", status);
if (codedbuf_proxy)
gst_vaapi_coded_buffer_proxy_unref (codedbuf_proxy);
return GST_FLOW_ERROR;
}
error_allocate_buffer:
{
GST_ERROR ("failed to allocate encoded buffer in system memory");
if (out_buffer)
gst_buffer_unref (out_buffer);
gst_video_codec_frame_unref (out_frame);
return ret;
}
error_output_state:
{
GST_ERROR ("failed to negotiate output state (status %d)", status);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encode);
gst_video_codec_frame_unref (out_frame);
return GST_FLOW_NOT_NEGOTIATED;
}
}
static void
gst_vaapiencode_buffer_loop (GstVaapiEncode * encode)
{
GstFlowReturn ret;
const gint64 timeout = 50000; /* microseconds */
ret = gst_vaapiencode_push_frame (encode, timeout);
if (ret == GST_FLOW_OK || ret == GST_VAAPI_ENCODE_FLOW_TIMEOUT)
return;
gst_pad_pause_task (GST_VAAPI_PLUGIN_BASE_SRC_PAD (encode));
}
static GstCaps *
gst_vaapiencode_get_caps_impl (GstVideoEncoder * venc)
{
GstVaapiPluginBase *const plugin = GST_VAAPI_PLUGIN_BASE (venc);
GstCaps *caps;
if (plugin->sinkpad_caps)
caps = gst_caps_ref (plugin->sinkpad_caps);
else {
caps = gst_pad_get_pad_template_caps (plugin->sinkpad);
}
return caps;
}
static GstCaps *
gst_vaapiencode_get_caps (GstVideoEncoder * venc, GstCaps * filter)
{
GstCaps *caps, *out_caps;
out_caps = gst_vaapiencode_get_caps_impl (venc);
if (out_caps && filter) {
caps = gst_caps_intersect_full (out_caps, filter, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (out_caps);
out_caps = caps;
}
return out_caps;
}
static gboolean
gst_vaapiencode_destroy (GstVaapiEncode * encode)
{
if (encode->input_state) {
gst_video_codec_state_unref (encode->input_state);
encode->input_state = NULL;
}
if (encode->output_state) {
gst_video_codec_state_unref (encode->output_state);
encode->output_state = NULL;
}
gst_vaapi_encoder_replace (&encode->encoder, NULL);
return TRUE;
}
static gboolean
ensure_encoder (GstVaapiEncode * encode)
{
GstVaapiEncodeClass *klass = GST_VAAPIENCODE_GET_CLASS (encode);
GstVaapiEncoderStatus status;
GPtrArray *const prop_values = encode->prop_values;
guint i;
g_return_val_if_fail (klass->alloc_encoder, FALSE);
encode->encoder = klass->alloc_encoder (encode,
GST_VAAPI_PLUGIN_BASE_DISPLAY (encode));
if (!encode->encoder)
return FALSE;
if (prop_values) {
for (i = 0; i < prop_values->len; i++) {
PropValue *const prop_value = g_ptr_array_index (prop_values, i);
status = gst_vaapi_encoder_set_property (encode->encoder, prop_value->id,
&prop_value->value);
if (status != GST_VAAPI_ENCODER_STATUS_SUCCESS)
return FALSE;
}
}
return TRUE;
}
static gboolean
gst_vaapiencode_open (GstVideoEncoder * venc)
{
GstVaapiEncode *const encode = GST_VAAPIENCODE_CAST (venc);
GstVaapiDisplay *const old_display = GST_VAAPI_PLUGIN_BASE_DISPLAY (encode);
gboolean success;
if (!gst_vaapi_plugin_base_open (GST_VAAPI_PLUGIN_BASE (encode)))
return FALSE;
GST_VAAPI_PLUGIN_BASE_DISPLAY (encode) = NULL;
success = ensure_display (encode);
if (old_display)
gst_vaapi_display_unref (old_display);
return success;
}
static gboolean
gst_vaapiencode_close (GstVideoEncoder * venc)
{
GstVaapiEncode *const encode = GST_VAAPIENCODE_CAST (venc);
gst_vaapiencode_destroy (encode);
gst_vaapi_plugin_base_close (GST_VAAPI_PLUGIN_BASE (encode));
return TRUE;
}
static gboolean
set_codec_state (GstVaapiEncode * encode, GstVideoCodecState * state)
{
GstVaapiEncodeClass *const klass = GST_VAAPIENCODE_GET_CLASS (encode);
GstVaapiEncoderStatus status;
g_return_val_if_fail (encode->encoder, FALSE);
/* Initialize codec specific parameters */
if (klass->set_config && !klass->set_config (encode))
return FALSE;
status = gst_vaapi_encoder_set_codec_state (encode->encoder, state);
if (status != GST_VAAPI_ENCODER_STATUS_SUCCESS)
return FALSE;
return TRUE;
}
static gboolean
gst_vaapiencode_set_format (GstVideoEncoder * venc, GstVideoCodecState * state)
{
GstVaapiEncode *const encode = GST_VAAPIENCODE_CAST (venc);
g_return_val_if_fail (state->caps != NULL, FALSE);
if (!ensure_encoder (encode))
return FALSE;
if (!set_codec_state (encode, state))
return FALSE;
if (!gst_vaapi_plugin_base_set_caps (GST_VAAPI_PLUGIN_BASE (encode),
state->caps, NULL))
return FALSE;
if (encode->input_state)
gst_video_codec_state_unref (encode->input_state);
encode->input_state = gst_video_codec_state_ref (state);
encode->input_state_changed = TRUE;
return gst_pad_start_task (GST_VAAPI_PLUGIN_BASE_SRC_PAD (encode),
(GstTaskFunction) gst_vaapiencode_buffer_loop, encode, NULL);
}
static GstFlowReturn
gst_vaapiencode_handle_frame (GstVideoEncoder * venc,
GstVideoCodecFrame * frame)
{
GstVaapiEncode *const encode = GST_VAAPIENCODE_CAST (venc);
GstVaapiEncoderStatus status;
GstVaapiVideoMeta *meta;
GstVaapiSurfaceProxy *proxy;
GstFlowReturn ret;
GstBuffer *buf;
buf = NULL;
ret = gst_vaapi_plugin_base_get_input_buffer (GST_VAAPI_PLUGIN_BASE (encode),
frame->input_buffer, &buf);
if (ret != GST_FLOW_OK)
goto error_buffer_invalid;
gst_buffer_replace (&frame->input_buffer, buf);
gst_buffer_unref (buf);
meta = gst_buffer_get_vaapi_video_meta (buf);
if (!meta)
goto error_buffer_no_meta;
proxy = gst_vaapi_video_meta_get_surface_proxy (meta);
if (!proxy)
goto error_buffer_no_surface_proxy;
gst_video_codec_frame_set_user_data (frame,
gst_vaapi_surface_proxy_ref (proxy),
(GDestroyNotify) gst_vaapi_surface_proxy_unref);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encode);
status = gst_vaapi_encoder_put_frame (encode->encoder, frame);
GST_VIDEO_ENCODER_STREAM_LOCK (encode);
if (status < GST_VAAPI_ENCODER_STATUS_SUCCESS)
goto error_encode_frame;
gst_video_codec_frame_unref (frame);
return GST_FLOW_OK;
/* ERRORS */
error_buffer_invalid:
{
if (buf)
gst_buffer_unref (buf);
gst_video_codec_frame_unref (frame);
return ret;
}
error_buffer_no_meta:
{
GST_ERROR ("failed to get GstVaapiVideoMeta information");
gst_video_codec_frame_unref (frame);
return GST_FLOW_ERROR;
}
error_buffer_no_surface_proxy:
{
GST_ERROR ("failed to get VA surface proxy");
gst_video_codec_frame_unref (frame);
return GST_FLOW_ERROR;
}
error_encode_frame:
{
GST_ERROR ("failed to encode frame %d (status %d)",
frame->system_frame_number, status);
gst_video_codec_frame_unref (frame);
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
gst_vaapiencode_finish (GstVideoEncoder * venc)
{
GstVaapiEncode *const encode = GST_VAAPIENCODE_CAST (venc);
GstVaapiEncoderStatus status;
GstFlowReturn ret = GST_FLOW_OK;
/* Don't try to destroy encoder if none was created in the first place.
Return "not-negotiated" error since this means we did not even reach
GstVideoEncoder::set_format() state, where the encoder could have
been created */
if (!encode->encoder)
return GST_FLOW_NOT_NEGOTIATED;
status = gst_vaapi_encoder_flush (encode->encoder);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encode);
gst_pad_stop_task (GST_VAAPI_PLUGIN_BASE_SRC_PAD (encode));
GST_VIDEO_ENCODER_STREAM_LOCK (encode);
while (status == GST_VAAPI_ENCODER_STATUS_SUCCESS && ret == GST_FLOW_OK)
ret = gst_vaapiencode_push_frame (encode, 0);
if (ret == GST_VAAPI_ENCODE_FLOW_TIMEOUT)
ret = GST_FLOW_OK;
return ret;
}
static GstStateChangeReturn
gst_vaapiencode_change_state (GstElement * element, GstStateChange transition)
{
GstVaapiEncode *const encode = GST_VAAPIENCODE_CAST (element);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_pad_stop_task (GST_VAAPI_PLUGIN_BASE_SRC_PAD (encode));
break;
default:
break;
}
return
GST_ELEMENT_CLASS (gst_vaapiencode_parent_class)->change_state (element,
transition);
}
static gboolean
gst_vaapiencode_propose_allocation (GstVideoEncoder * venc, GstQuery * query)
{
GstVaapiPluginBase *const plugin = GST_VAAPI_PLUGIN_BASE (venc);
if (!gst_vaapi_plugin_base_propose_allocation (plugin, query))
return FALSE;
return TRUE;
}
static void
gst_vaapiencode_finalize (GObject * object)
{
GstVaapiEncode *const encode = GST_VAAPIENCODE_CAST (object);
gst_vaapiencode_destroy (encode);
if (encode->prop_values) {
g_ptr_array_unref (encode->prop_values);
encode->prop_values = NULL;
}
gst_vaapi_plugin_base_finalize (GST_VAAPI_PLUGIN_BASE (object));
G_OBJECT_CLASS (gst_vaapiencode_parent_class)->finalize (object);
}
static void
gst_vaapiencode_init (GstVaapiEncode * encode)
{
GstVaapiPluginBase *const plugin = GST_VAAPI_PLUGIN_BASE (encode);
gst_vaapi_plugin_base_init (GST_VAAPI_PLUGIN_BASE (encode), GST_CAT_DEFAULT);
gst_pad_use_fixed_caps (plugin->srcpad);
}
static void
gst_vaapiencode_class_init (GstVaapiEncodeClass * klass)
{
GObjectClass *const object_class = G_OBJECT_CLASS (klass);
GstElementClass *const element_class = GST_ELEMENT_CLASS (klass);
GstVideoEncoderClass *const venc_class = GST_VIDEO_ENCODER_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (gst_vaapiencode_debug,
GST_PLUGIN_NAME, 0, GST_PLUGIN_DESC);
gst_vaapi_plugin_base_class_init (GST_VAAPI_PLUGIN_BASE_CLASS (klass));
object_class->finalize = gst_vaapiencode_finalize;
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_vaapiencode_change_state);
venc_class->open = GST_DEBUG_FUNCPTR (gst_vaapiencode_open);
venc_class->close = GST_DEBUG_FUNCPTR (gst_vaapiencode_close);
venc_class->set_format = GST_DEBUG_FUNCPTR (gst_vaapiencode_set_format);
venc_class->handle_frame = GST_DEBUG_FUNCPTR (gst_vaapiencode_handle_frame);
venc_class->finish = GST_DEBUG_FUNCPTR (gst_vaapiencode_finish);
venc_class->getcaps = GST_DEBUG_FUNCPTR (gst_vaapiencode_get_caps);
venc_class->propose_allocation =
GST_DEBUG_FUNCPTR (gst_vaapiencode_propose_allocation);
klass->get_property = gst_vaapiencode_default_get_property;
klass->set_property = gst_vaapiencode_default_set_property;
klass->alloc_buffer = gst_vaapiencode_default_alloc_buffer;
venc_class->src_query = GST_DEBUG_FUNCPTR (gst_vaapiencode_src_query);
venc_class->sink_query = GST_DEBUG_FUNCPTR (gst_vaapiencode_sink_query);
}
static inline GPtrArray *
get_properties (GstVaapiEncodeClass * klass)
{
return klass->get_properties ? klass->get_properties () : NULL;
}
gboolean
gst_vaapiencode_init_properties (GstVaapiEncode * encode)
{
GPtrArray *const props = get_properties (GST_VAAPIENCODE_GET_CLASS (encode));
guint i;
/* XXX: use base_init()/base_finalize() to avoid multiple initializations */
if (!props)
return FALSE;
encode->prop_values =
g_ptr_array_new_full (props->len, (GDestroyNotify) prop_value_free);
if (!encode->prop_values) {
g_ptr_array_unref (props);
return FALSE;
}
for (i = 0; i < props->len; i++) {
PropValue *const prop_value = prop_value_new ((GstVaapiEncoderPropInfo *)
g_ptr_array_index (props, i));
if (!prop_value)
return FALSE;
g_ptr_array_add (encode->prop_values, prop_value);
}
return TRUE;
}
gboolean
gst_vaapiencode_class_init_properties (GstVaapiEncodeClass * klass)
{
GObjectClass *const object_class = G_OBJECT_CLASS (klass);
GPtrArray *const props = get_properties (klass);
guint i;
if (!props)
return FALSE;
for (i = 0; i < props->len; i++) {
GstVaapiEncoderPropInfo *const prop = g_ptr_array_index (props, i);
g_object_class_install_property (object_class, PROP_BASE + i, prop->pspec);
}
g_ptr_array_unref (props);
return TRUE;
}