gstreamer/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapiencode_h264.c

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/*
* gstvaapiencode_h264.c - VA-API H.264 encoder
*
2014-01-22 17:54:14 +00:00
* Copyright (C) 2012-2014 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
*/
/**
* SECTION:element-vaapih264enc
* @short_description: A VA-API based H.264 video encoder
*
* Encodes raw video streams into H.264 bitstreams.
*
* The #GstVaapiEncodeH264:rate-control property controls the type of
* encoding. In case of Constant Bitrate Encoding (CBR), the
* #GstVaapiEncodeH264:bitrate will determine the quality of the
* encoding. Alternatively, one may choose to perform Constant
* Quantizer or Variable Bitrate Encoding (VBR), in which case the
* #GstVaapiEncodeH264:bitrate is the maximum bitrate.
*
* The H264 profile that is eventually used depends on a few settings.
* If #GstVaapiEncodeH264:dct8x8 is enabled, then High profile is
* used. Otherwise, if #GstVaapiEncodeH264:cabac entropy coding is
* enabled or #GstVaapiEncodeH264:max-bframes are allowed, then Main
* Profile is in effect. The element will alway go with the maximal
* profile available in the caps negotation and otherwise Baseline
* profile applies. But in some cases (e.g. hardware platforms) a more
* restrictedprofile/level may be necessary. The recommended way to
* set a profile is to set it in the downstream caps.
*
* You can also set parameters to adjust the latency of encoding:
* #GstVaapiEncodeH264:quality-level is a number between 1-7, in the
* case of the Intel VAAPI driver, where a lower value will produce a
* higher quality output but with more latency; meanwhile a hihg
* number will produce a lower quality output with less latency. Also
* you can set #GstVaapiEncodeH264:tune, if your backend supports it,
* for low-power mode or high compression.
*
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* ## Example launch line
*
* |[
* gst-launch-1.0 -ev videotestsrc num-buffers=60 ! timeoverlay ! vaapih264enc ! h264parse ! mp4mux ! filesink location=test.mp4
* ]|
*/
#include "gstcompat.h"
#include <gst/vaapi/gstvaapidisplay.h>
#include <gst/vaapi/gstvaapiencoder_h264.h>
#include <gst/vaapi/gstvaapiutils_h264.h>
#include "gstvaapiencode_h264.h"
#include "gstvaapipluginutil.h"
#include "gstvaapivideomemory.h"
#define GST_PLUGIN_NAME "vaapih264enc"
#define GST_PLUGIN_DESC "A VA-API based H264 video encoder"
GST_DEBUG_CATEGORY_STATIC (gst_vaapi_h264_encode_debug);
#define GST_CAT_DEFAULT gst_vaapi_h264_encode_debug
#define GST_CODEC_CAPS \
"video/x-h264, " \
"stream-format = (string) { avc, byte-stream }, " \
"alignment = (string) au"
#define EXTRA_FORMATS {}
/* h264 encode */
GST_VAAPI_ENCODE_REGISTER_TYPE (h264, H264, H264, EXTRA_FORMATS,
gst_vaapi_utils_h264_get_profile_string);
static void
gst_vaapiencode_h264_init (GstVaapiEncodeH264 * encode)
{
/* nothing to do here */
}
static void
gst_vaapiencode_h264_finalize (GObject * object)
{
GstVaapiEncodeH264 *const encode = GST_VAAPIENCODE_H264_CAST (object);
gst_caps_replace (&encode->available_caps, NULL);
G_OBJECT_CLASS (gst_vaapiencode_h264_parent_class)->finalize (object);
}
plugin: encode: List all possible profiles to detect input formats. The current get_profile just return one possible profile for the encode, which is not enough. For example, if we want to support HEVC 4:4:4 profile, the input of encode should be VYUA rather than NV12 in HEVC main profile. So the command line: gst-launch-1.0 videotestsrc num-buffers=200 ! capsfilter \ caps=video/x-raw,format=VUYA,width=800,height=600 ! vaapih265enc \ tune=low-power init-qp=30 ! fakesink can not work because vaapih265enc just report NV12 in sink caps, we need to specify the profile obviously like: gst-launch-1.0 videotestsrc num-buffers=200 ! capsfilter \ caps=video/x-raw,format=VUYA,width=800,height=600 ! vaapih265enc \ tune=low-power init-qp=30 ! capsfilter caps=video/x-h265, \ profile=main-444 ! fakesink The encode should have the ability to choose the profile based on input format automatically. If the input video format is VUYA, the main-444 profile should be auto choosed. We modify to let get_allowed_profiles of each encode sub class to return an array of all supported profiles based on downstream's allowed caps, or return NULL if no valid profiles specified by downstream. If no allowed profiles found, all profiles which belong to the current encoder's codec will be the candidates. The function gst_vaapi_encoder_get_surface_attributes collects the surface's attributes for that profile list we just get. So for this case, both NV12 and VUYA should be returned. TODO: some codec like VP9, need to implement the get_profile() function.
2019-12-23 06:29:08 +00:00
static GArray *
gst_vaapiencode_h264_get_allowed_profiles (GstVaapiEncode * encode,
GstCaps * allowed)
{
return gst_vaapi_encoder_get_profiles_from_caps (allowed,
plugin: encode: List all possible profiles to detect input formats. The current get_profile just return one possible profile for the encode, which is not enough. For example, if we want to support HEVC 4:4:4 profile, the input of encode should be VYUA rather than NV12 in HEVC main profile. So the command line: gst-launch-1.0 videotestsrc num-buffers=200 ! capsfilter \ caps=video/x-raw,format=VUYA,width=800,height=600 ! vaapih265enc \ tune=low-power init-qp=30 ! fakesink can not work because vaapih265enc just report NV12 in sink caps, we need to specify the profile obviously like: gst-launch-1.0 videotestsrc num-buffers=200 ! capsfilter \ caps=video/x-raw,format=VUYA,width=800,height=600 ! vaapih265enc \ tune=low-power init-qp=30 ! capsfilter caps=video/x-h265, \ profile=main-444 ! fakesink The encode should have the ability to choose the profile based on input format automatically. If the input video format is VUYA, the main-444 profile should be auto choosed. We modify to let get_allowed_profiles of each encode sub class to return an array of all supported profiles based on downstream's allowed caps, or return NULL if no valid profiles specified by downstream. If no allowed profiles found, all profiles which belong to the current encoder's codec will be the candidates. The function gst_vaapi_encoder_get_surface_attributes collects the surface's attributes for that profile list we just get. So for this case, both NV12 and VUYA should be returned. TODO: some codec like VP9, need to implement the get_profile() function.
2019-12-23 06:29:08 +00:00
gst_vaapi_utils_h264_get_profile_from_string);
}
typedef struct
{
GstVaapiProfile best_profile;
guint best_score;
} FindBestProfileData;
static void
find_best_profile_value (FindBestProfileData * data, const GValue * value)
{
const gchar *str;
GstVaapiProfile profile;
guint score;
if (!value || !G_VALUE_HOLDS_STRING (value))
return;
str = g_value_get_string (value);
if (!str)
return;
profile = gst_vaapi_utils_h264_get_profile_from_string (str);
if (!profile)
return;
score = gst_vaapi_utils_h264_get_profile_score (profile);
if (score < data->best_score)
return;
data->best_profile = profile;
data->best_score = score;
}
static GstVaapiProfile
find_best_profile (GstCaps * caps)
{
FindBestProfileData data;
guint i, j, num_structures, num_values;
data.best_profile = GST_VAAPI_PROFILE_UNKNOWN;
data.best_score = 0;
num_structures = gst_caps_get_size (caps);
for (i = 0; i < num_structures; i++) {
GstStructure *const structure = gst_caps_get_structure (caps, i);
const GValue *const value = gst_structure_get_value (structure, "profile");
if (!value)
continue;
if (G_VALUE_HOLDS_STRING (value))
find_best_profile_value (&data, value);
else if (GST_VALUE_HOLDS_LIST (value)) {
num_values = gst_value_list_get_size (value);
for (j = 0; j < num_values; j++)
find_best_profile_value (&data, gst_value_list_get_value (value, j));
}
}
return data.best_profile;
}
static GstCaps *
get_available_caps (GstVaapiEncodeH264 * encode)
{
GstVaapiEncode *const base_encode = GST_VAAPIENCODE_CAST (encode);
GstVaapiEncoderH264 *const encoder =
GST_VAAPI_ENCODER_H264 (base_encode->encoder);
GstCaps *out_caps;
GArray *profiles;
GstVaapiProfile profile;
const gchar *profile_str;
GValue profile_v = G_VALUE_INIT;
GValue profile_list = G_VALUE_INIT;
guint i;
if (encode->available_caps)
return encode->available_caps;
g_value_init (&profile_list, GST_TYPE_LIST);
g_value_init (&profile_v, G_TYPE_STRING);
profiles =
gst_vaapi_display_get_encode_profiles
(GST_VAAPI_PLUGIN_BASE_DISPLAY (encode));
if (!profiles)
return NULL;
for (i = 0; i < profiles->len; i++) {
profile = g_array_index (profiles, GstVaapiProfile, i);
if (gst_vaapi_profile_get_codec (profile) != GST_VAAPI_CODEC_H264)
continue;
profile_str = gst_vaapi_profile_get_name (profile);
if (!profile_str)
continue;
g_value_set_string (&profile_v, profile_str);
gst_value_list_append_value (&profile_list, &profile_v);
}
g_array_unref (profiles);
out_caps = gst_caps_from_string (GST_CODEC_CAPS);
gst_caps_set_value (out_caps, "profile", &profile_list);
g_value_unset (&profile_list);
g_value_unset (&profile_v);
if (!gst_vaapi_encoder_h264_supports_avc (encoder)) {
GST_INFO_OBJECT (encode,
"avc requires packed header support, outputting byte-stream");
gst_caps_set_simple (out_caps, "stream-format", G_TYPE_STRING,
"byte-stream", NULL);
}
encode->available_caps = out_caps;
return encode->available_caps;
}
static gboolean
gst_vaapiencode_h264_set_config (GstVaapiEncode * base_encode)
{
GstVaapiEncodeH264 *const encode = GST_VAAPIENCODE_H264_CAST (base_encode);
GstVaapiEncoderH264 *const encoder =
GST_VAAPI_ENCODER_H264 (base_encode->encoder);
GstCaps *template_caps, *allowed_caps;
gboolean ret = TRUE;
template_caps =
gst_pad_get_pad_template_caps (GST_VAAPI_PLUGIN_BASE_SRC_PAD (encode));
allowed_caps =
gst_pad_get_allowed_caps (GST_VAAPI_PLUGIN_BASE_SRC_PAD (encode));
if (allowed_caps == template_caps) {
GST_INFO_OBJECT (encode, "downstream has ANY caps, outputting byte-stream");
encode->is_avc = FALSE;
gst_caps_unref (allowed_caps);
} else if (!allowed_caps) {
GST_INFO_OBJECT (encode,
"downstream has NULL caps, outputting byte-stream");
encode->is_avc = FALSE;
} else if (gst_caps_is_empty (allowed_caps)) {
GST_INFO_OBJECT (encode, "downstream has EMPTY caps");
goto fail;
} else {
const char *stream_format = NULL;
GstStructure *structure;
GstVaapiProfile profile = GST_VAAPI_PROFILE_UNKNOWN;
GstCaps *available_caps;
GstCaps *profile_caps;
available_caps = get_available_caps (encode);
if (!available_caps)
goto fail;
if (!gst_caps_can_intersect (allowed_caps, available_caps)) {
GstCaps *tmp_caps;
GST_INFO_OBJECT (encode, "downstream may have requested an unsupported "
"profile. Encoder will try to output a compatible one");
/* Let's try the best profile in the allowed caps.
* The internal encoder will fail later if it can't handle it */
profile = find_best_profile (allowed_caps);
if (profile == GST_VAAPI_PROFILE_UNKNOWN)
goto fail;
/* if allwed caps request baseline (which is deprecated), the
* encoder will try with constrained baseline which is
* compatible. */
if (profile == GST_VAAPI_PROFILE_H264_BASELINE)
profile = GST_VAAPI_PROFILE_H264_CONSTRAINED_BASELINE;
tmp_caps = gst_caps_from_string (GST_CODEC_CAPS);
gst_caps_set_simple (tmp_caps, "profile", G_TYPE_STRING,
gst_vaapi_profile_get_name (profile), NULL);
if (!gst_vaapi_encoder_h264_supports_avc (encoder)) {
gst_caps_set_simple (tmp_caps, "stream-format", G_TYPE_STRING,
"byte-stream", NULL);
}
profile_caps = gst_caps_intersect (available_caps, tmp_caps);
gst_caps_unref (tmp_caps);
if (gst_caps_is_empty (profile_caps)) {
gst_caps_unref (profile_caps);
goto fail;
}
} else {
profile_caps = gst_caps_intersect (allowed_caps, available_caps);
profile = find_best_profile (profile_caps);
}
profile_caps = gst_caps_fixate (profile_caps);
structure = gst_caps_get_structure (profile_caps, 0);
stream_format = gst_structure_get_string (structure, "stream-format");
encode->is_avc = (g_strcmp0 (stream_format, "avc") == 0);
if (profile != GST_VAAPI_PROFILE_UNKNOWN) {
GST_INFO ("using %s profile as target decoder constraints",
gst_vaapi_utils_h264_get_profile_string (profile));
ret = gst_vaapi_encoder_h264_set_max_profile (encoder, profile);
} else {
ret = FALSE;
}
gst_caps_unref (profile_caps);
gst_caps_unref (allowed_caps);
}
gst_caps_unref (template_caps);
base_encode->need_codec_data = encode->is_avc;
return ret;
fail:
{
gst_caps_unref (template_caps);
gst_caps_unref (allowed_caps);
return FALSE;
}
}
static void
set_compatible_profile (GstVaapiEncodeH264 * encode, GstCaps * caps,
GstVaapiProfile profile, GstVaapiLevelH264 level)
{
GstCaps *allowed_caps, *tmp_caps;
gboolean ret = FALSE;
allowed_caps =
gst_pad_get_allowed_caps (GST_VAAPI_PLUGIN_BASE_SRC_PAD (encode));
if (!allowed_caps || gst_caps_is_empty (allowed_caps)) {
if (allowed_caps)
gst_caps_unref (allowed_caps);
return;
}
tmp_caps = gst_caps_from_string (GST_CODEC_CAPS);
/* If profile doesn't exist in the allowed caps, let's find
* compatible profile in the caps.
*
* If there is one, we can set it as a compatible profile and make
* the negotiation. We consider baseline compatible with
* constrained-baseline, which is a strict subset of baseline
* profile.
*/
retry:
gst_caps_set_simple (tmp_caps, "profile", G_TYPE_STRING,
gst_vaapi_utils_h264_get_profile_string (profile), NULL);
if (!gst_caps_can_intersect (allowed_caps, tmp_caps)) {
if (profile == GST_VAAPI_PROFILE_H264_CONSTRAINED_BASELINE) {
profile = GST_VAAPI_PROFILE_H264_BASELINE;
GST_WARNING_OBJECT (GST_VAAPIENCODE_CAST (encode), "user might requested "
"baseline profile, trying constrained-baseline instead");
goto retry;
}
} else {
gst_caps_set_simple (caps, "profile", G_TYPE_STRING,
gst_vaapi_utils_h264_get_profile_string (profile),
"level", G_TYPE_STRING, gst_vaapi_utils_h264_get_level_string (level),
NULL);
ret = TRUE;
}
if (!ret)
GST_LOG ("There is no compatible profile in the requested caps.");
gst_caps_unref (tmp_caps);
gst_caps_unref (allowed_caps);
return;
}
static GstCaps *
gst_vaapiencode_h264_get_caps (GstVaapiEncode * base_encode)
{
GstVaapiEncodeH264 *const encode = GST_VAAPIENCODE_H264_CAST (base_encode);
GstVaapiEncoderH264 *const encoder =
GST_VAAPI_ENCODER_H264 (base_encode->encoder);
GstVaapiProfile profile;
GstVaapiLevelH264 level;
GstCaps *caps;
caps = gst_caps_from_string (GST_CODEC_CAPS);
gst_caps_set_simple (caps, "stream-format", G_TYPE_STRING,
encode->is_avc ? "avc" : "byte-stream", NULL);
/* Update profile determined by encoder */
gst_vaapi_encoder_h264_get_profile_and_level (encoder, &profile, &level);
if (profile != GST_VAAPI_PROFILE_UNKNOWN)
set_compatible_profile (encode, caps, profile, level);
GST_INFO_OBJECT (base_encode, "out caps %" GST_PTR_FORMAT, caps);
return caps;
}
static GstVaapiEncoder *
gst_vaapiencode_h264_alloc_encoder (GstVaapiEncode * base,
GstVaapiDisplay * display)
{
return gst_vaapi_encoder_h264_new (display);
}
/* h264 NAL byte stream operations */
static guint8 *
_h264_byte_stream_next_nal (guint8 * buffer, guint32 len, guint32 * nal_size)
{
const guint8 *cur = buffer;
const guint8 *const end = buffer + len;
guint8 *nal_start = NULL;
guint32 flag = 0xFFFFFFFF;
guint32 nal_start_len = 0;
g_assert (buffer && nal_size);
if (len < 3) {
*nal_size = len;
nal_start = (len ? buffer : NULL);
return nal_start;
}
/*locate head postion */
if (!buffer[0] && !buffer[1]) {
if (buffer[2] == 1) { /* 0x000001 */
nal_start_len = 3;
} else if (!buffer[2] && len >= 4 && buffer[3] == 1) { /* 0x00000001 */
nal_start_len = 4;
}
}
nal_start = buffer + nal_start_len;
cur = nal_start;
/*find next nal start position */
while (cur < end) {
flag = ((flag << 8) | ((*cur++) & 0xFF));
if ((flag & 0x00FFFFFF) == 0x00000001) {
if (flag == 0x00000001)
*nal_size = cur - 4 - nal_start;
else
*nal_size = cur - 3 - nal_start;
break;
}
}
if (cur >= end) {
*nal_size = end - nal_start;
if (nal_start >= end) {
nal_start = NULL;
}
}
return nal_start;
}
static inline void
_start_code_to_size (guint8 nal_start_code[4], guint32 nal_size)
{
nal_start_code[0] = ((nal_size >> 24) & 0xFF);
nal_start_code[1] = ((nal_size >> 16) & 0xFF);
nal_start_code[2] = ((nal_size >> 8) & 0xFF);
nal_start_code[3] = (nal_size & 0xFF);
}
static gboolean
_h264_convert_byte_stream_to_avc (GstBuffer * buf)
{
GstMapInfo info;
guint32 nal_size;
guint8 *nal_start_code, *nal_body;
guint8 *frame_end;
g_assert (buf);
if (!gst_buffer_map (buf, &info, GST_MAP_READ | GST_MAP_WRITE))
return FALSE;
nal_start_code = info.data;
frame_end = info.data + info.size;
nal_size = 0;
while ((frame_end > nal_start_code) &&
(nal_body = _h264_byte_stream_next_nal (nal_start_code,
frame_end - nal_start_code, &nal_size)) != NULL) {
if (!nal_size)
goto error;
g_assert (nal_body - nal_start_code == 4);
_start_code_to_size (nal_start_code, nal_size);
nal_start_code = nal_body + nal_size;
}
gst_buffer_unmap (buf, &info);
return TRUE;
2016-11-03 11:54:23 +00:00
/* ERRORS */
error:
{
gst_buffer_unmap (buf, &info);
return FALSE;
}
}
static GstFlowReturn
gst_vaapiencode_h264_alloc_buffer (GstVaapiEncode * base_encode,
GstVaapiCodedBuffer * coded_buf, GstBuffer ** out_buffer_ptr)
{
GstVaapiEncodeH264 *const encode = GST_VAAPIENCODE_H264_CAST (base_encode);
GstVaapiEncoderH264 *const encoder =
GST_VAAPI_ENCODER_H264 (base_encode->encoder);
GstFlowReturn ret;
g_return_val_if_fail (encoder != NULL, GST_FLOW_ERROR);
ret =
GST_VAAPIENCODE_CLASS (gst_vaapiencode_h264_parent_class)->alloc_buffer
(base_encode, coded_buf, out_buffer_ptr);
if (ret != GST_FLOW_OK)
return ret;
if (!encode->is_avc)
return GST_FLOW_OK;
/* Convert to avcC format */
if (!_h264_convert_byte_stream_to_avc (*out_buffer_ptr))
goto error_convert_buffer;
return GST_FLOW_OK;
/* ERRORS */
error_convert_buffer:
{
GST_ERROR ("failed to convert from bytestream format to avcC format");
gst_buffer_replace (out_buffer_ptr, NULL);
return GST_FLOW_ERROR;
}
}
static void
gst_vaapiencode_h264_class_init (GstVaapiEncodeH264Class * klass, gpointer data)
{
GObjectClass *const object_class = G_OBJECT_CLASS (klass);
GstElementClass *const element_class = GST_ELEMENT_CLASS (klass);
GstVaapiEncodeClass *const encode_class = GST_VAAPIENCODE_CLASS (klass);
GstCaps *sink_caps = ((GstVaapiEncodeInitData *) data)->sink_caps;
GstCaps *src_caps = ((GstVaapiEncodeInitData *) data)->src_caps;
GstPadTemplate *templ;
GstCaps *static_caps;
gpointer encoder_class;
object_class->finalize = gst_vaapiencode_h264_finalize;
object_class->set_property = gst_vaapiencode_set_property_subclass;
object_class->get_property = gst_vaapiencode_get_property_subclass;
plugin: encode: List all possible profiles to detect input formats. The current get_profile just return one possible profile for the encode, which is not enough. For example, if we want to support HEVC 4:4:4 profile, the input of encode should be VYUA rather than NV12 in HEVC main profile. So the command line: gst-launch-1.0 videotestsrc num-buffers=200 ! capsfilter \ caps=video/x-raw,format=VUYA,width=800,height=600 ! vaapih265enc \ tune=low-power init-qp=30 ! fakesink can not work because vaapih265enc just report NV12 in sink caps, we need to specify the profile obviously like: gst-launch-1.0 videotestsrc num-buffers=200 ! capsfilter \ caps=video/x-raw,format=VUYA,width=800,height=600 ! vaapih265enc \ tune=low-power init-qp=30 ! capsfilter caps=video/x-h265, \ profile=main-444 ! fakesink The encode should have the ability to choose the profile based on input format automatically. If the input video format is VUYA, the main-444 profile should be auto choosed. We modify to let get_allowed_profiles of each encode sub class to return an array of all supported profiles based on downstream's allowed caps, or return NULL if no valid profiles specified by downstream. If no allowed profiles found, all profiles which belong to the current encoder's codec will be the candidates. The function gst_vaapi_encoder_get_surface_attributes collects the surface's attributes for that profile list we just get. So for this case, both NV12 and VUYA should be returned. TODO: some codec like VP9, need to implement the get_profile() function.
2019-12-23 06:29:08 +00:00
encode_class->get_allowed_profiles =
gst_vaapiencode_h264_get_allowed_profiles;
encode_class->set_config = gst_vaapiencode_h264_set_config;
encode_class->get_caps = gst_vaapiencode_h264_get_caps;
encode_class->alloc_encoder = gst_vaapiencode_h264_alloc_encoder;
encode_class->alloc_buffer = gst_vaapiencode_h264_alloc_buffer;
gst_element_class_set_static_metadata (element_class,
"VA-API H264 encoder",
"Codec/Encoder/Video/Hardware",
GST_PLUGIN_DESC, "Wind Yuan <feng.yuan@intel.com>");
/* sink pad */
g_assert (sink_caps);
static_caps = gst_caps_from_string (GST_VAAPI_ENCODE_STATIC_SINK_CAPS);
templ =
gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, sink_caps);
gst_pad_template_set_documentation_caps (templ, static_caps);
gst_element_class_add_pad_template (element_class, templ);
gst_caps_unref (static_caps);
gst_caps_unref (sink_caps);
/* src pad */
g_assert (src_caps);
static_caps = gst_caps_from_string (GST_CODEC_CAPS);
templ = gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS, src_caps);
gst_pad_template_set_documentation_caps (templ, static_caps);
gst_element_class_add_pad_template (element_class, templ);
gst_caps_unref (static_caps);
gst_caps_unref (src_caps);
encoder_class = g_type_class_ref (GST_TYPE_VAAPI_ENCODER_H264);
g_assert (encoder_class);
gst_vaapiencode_class_install_properties (encode_class, encoder_class);
g_type_class_unref (encoder_class);
}