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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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53a17f9c98
Use gst_vaapi_detect_codec_caps to get more precise template caps. Also implement gst_vaapiencode_h264_register_type, which should be called at plugin register time. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/-/merge_requests/315>
593 lines
18 KiB
C
593 lines
18 KiB
C
/*
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* gstvaapiencode_h264.c - VA-API H.264 encoder
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*
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* Copyright (C) 2012-2014 Intel Corporation
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* Author: Wind Yuan <feng.yuan@intel.com>
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* Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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/**
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* SECTION:element-vaapih264enc
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* @short_description: A VA-API based H.264 video encoder
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*
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* Encodes raw video streams into H.264 bitstreams.
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*
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* The #GstVaapiEncodeH264:rate-control property controls the type of
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* encoding. In case of Constant Bitrate Encoding (CBR), the
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* #GstVaapiEncodeH264:bitrate will determine the quality of the
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* encoding. Alternatively, one may choose to perform Constant
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* Quantizer or Variable Bitrate Encoding (VBR), in which case the
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* #GstVaapiEncodeH264:bitrate is the maximum bitrate.
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*
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* The H264 profile that is eventually used depends on a few settings.
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* If #GstVaapiEncodeH264:dct8x8 is enabled, then High profile is
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* used. Otherwise, if #GstVaapiEncodeH264:cabac entropy coding is
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* enabled or #GstVaapiEncodeH264:max-bframes are allowed, then Main
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* Profile is in effect. The element will alway go with the maximal
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* profile available in the caps negotation and otherwise Baseline
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* profile applies. But in some cases (e.g. hardware platforms) a more
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* restrictedprofile/level may be necessary. The recommended way to
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* set a profile is to set it in the downstream caps.
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*
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* You can also set parameters to adjust the latency of encoding:
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* #GstVaapiEncodeH264:quality-level is a number between 1-7, in the
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* case of the Intel VAAPI driver, where a lower value will produce a
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* higher quality output but with more latency; meanwhile a hihg
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* number will produce a lower quality output with less latency. Also
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* you can set #GstVaapiEncodeH264:tune, if your backend supports it,
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* for low-power mode or high compression.
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*
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* ## Example launch line
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*
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* |[
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* gst-launch-1.0 -ev videotestsrc num-buffers=60 ! timeoverlay ! vaapih264enc ! h264parse ! mp4mux ! filesink location=test.mp4
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* ]|
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*/
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#include "gstcompat.h"
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#include <gst/vaapi/gstvaapidisplay.h>
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#include <gst/vaapi/gstvaapiencoder_h264.h>
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#include <gst/vaapi/gstvaapiutils_h264.h>
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#include "gstvaapiencode_h264.h"
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#include "gstvaapipluginutil.h"
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#include "gstvaapivideomemory.h"
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#define GST_PLUGIN_NAME "vaapih264enc"
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#define GST_PLUGIN_DESC "A VA-API based H264 video encoder"
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GST_DEBUG_CATEGORY_STATIC (gst_vaapi_h264_encode_debug);
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#define GST_CAT_DEFAULT gst_vaapi_h264_encode_debug
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#define GST_CODEC_CAPS \
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"video/x-h264, " \
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"stream-format = (string) { avc, byte-stream }, " \
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"alignment = (string) au"
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/* *INDENT-OFF* */
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static const char gst_vaapiencode_h264_src_caps_str[] =
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GST_CODEC_CAPS ", "
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"profile = (string) { constrained-baseline, baseline, main, high, multiview-high, stereo-high }";
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/* *INDENT-ON* */
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/* *INDENT-OFF* */
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static GstStaticPadTemplate gst_vaapiencode_h264_src_factory =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (gst_vaapiencode_h264_src_caps_str));
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/* *INDENT-ON* */
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#define EXTRA_FORMATS {}
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/* h264 encode */
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GST_VAAPI_ENCODE_REGISTER_TYPE (h264, H264, H264, EXTRA_FORMATS);
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static void
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gst_vaapiencode_h264_init (GstVaapiEncodeH264 * encode)
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{
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/* nothing to do here */
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}
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static void
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gst_vaapiencode_h264_finalize (GObject * object)
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{
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GstVaapiEncodeH264 *const encode = GST_VAAPIENCODE_H264_CAST (object);
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gst_caps_replace (&encode->available_caps, NULL);
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G_OBJECT_CLASS (gst_vaapiencode_h264_parent_class)->finalize (object);
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}
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static GArray *
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gst_vaapiencode_h264_get_allowed_profiles (GstVaapiEncode * encode,
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GstCaps * allowed)
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{
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return gst_vaapi_h26x_encoder_get_profiles_from_caps (allowed,
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gst_vaapi_utils_h264_get_profile_from_string);
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}
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typedef struct
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{
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GstVaapiProfile best_profile;
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guint best_score;
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} FindBestProfileData;
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static void
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find_best_profile_value (FindBestProfileData * data, const GValue * value)
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{
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const gchar *str;
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GstVaapiProfile profile;
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guint score;
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if (!value || !G_VALUE_HOLDS_STRING (value))
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return;
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str = g_value_get_string (value);
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if (!str)
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return;
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profile = gst_vaapi_utils_h264_get_profile_from_string (str);
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if (!profile)
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return;
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score = gst_vaapi_utils_h264_get_profile_score (profile);
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if (score < data->best_score)
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return;
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data->best_profile = profile;
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data->best_score = score;
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}
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static GstVaapiProfile
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find_best_profile (GstCaps * caps)
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{
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FindBestProfileData data;
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guint i, j, num_structures, num_values;
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data.best_profile = GST_VAAPI_PROFILE_UNKNOWN;
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data.best_score = 0;
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num_structures = gst_caps_get_size (caps);
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for (i = 0; i < num_structures; i++) {
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GstStructure *const structure = gst_caps_get_structure (caps, i);
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const GValue *const value = gst_structure_get_value (structure, "profile");
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if (!value)
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continue;
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if (G_VALUE_HOLDS_STRING (value))
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find_best_profile_value (&data, value);
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else if (GST_VALUE_HOLDS_LIST (value)) {
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num_values = gst_value_list_get_size (value);
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for (j = 0; j < num_values; j++)
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find_best_profile_value (&data, gst_value_list_get_value (value, j));
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}
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}
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return data.best_profile;
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}
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static GstCaps *
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get_available_caps (GstVaapiEncodeH264 * encode)
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{
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GstVaapiEncode *const base_encode = GST_VAAPIENCODE_CAST (encode);
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GstVaapiEncoderH264 *const encoder =
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GST_VAAPI_ENCODER_H264 (base_encode->encoder);
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GstCaps *out_caps;
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GArray *profiles;
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GstVaapiProfile profile;
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const gchar *profile_str;
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GValue profile_v = G_VALUE_INIT;
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GValue profile_list = G_VALUE_INIT;
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guint i;
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if (encode->available_caps)
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return encode->available_caps;
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g_value_init (&profile_list, GST_TYPE_LIST);
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g_value_init (&profile_v, G_TYPE_STRING);
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profiles =
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gst_vaapi_display_get_encode_profiles
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(GST_VAAPI_PLUGIN_BASE_DISPLAY (encode));
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if (!profiles)
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return NULL;
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for (i = 0; i < profiles->len; i++) {
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profile = g_array_index (profiles, GstVaapiProfile, i);
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if (gst_vaapi_profile_get_codec (profile) != GST_VAAPI_CODEC_H264)
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continue;
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profile_str = gst_vaapi_profile_get_name (profile);
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if (!profile_str)
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continue;
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g_value_set_string (&profile_v, profile_str);
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gst_value_list_append_value (&profile_list, &profile_v);
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}
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g_array_unref (profiles);
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out_caps = gst_caps_from_string (GST_CODEC_CAPS);
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gst_caps_set_value (out_caps, "profile", &profile_list);
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g_value_unset (&profile_list);
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g_value_unset (&profile_v);
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if (!gst_vaapi_encoder_h264_supports_avc (encoder)) {
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GST_INFO_OBJECT (encode,
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"avc requires packed header support, outputting byte-stream");
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gst_caps_set_simple (out_caps, "stream-format", G_TYPE_STRING,
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"byte-stream", NULL);
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}
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encode->available_caps = out_caps;
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return encode->available_caps;
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}
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static gboolean
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gst_vaapiencode_h264_set_config (GstVaapiEncode * base_encode)
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{
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GstVaapiEncodeH264 *const encode = GST_VAAPIENCODE_H264_CAST (base_encode);
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GstVaapiEncoderH264 *const encoder =
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GST_VAAPI_ENCODER_H264 (base_encode->encoder);
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GstCaps *template_caps, *allowed_caps;
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gboolean ret = TRUE;
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template_caps =
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gst_static_pad_template_get_caps (&gst_vaapiencode_h264_src_factory);
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allowed_caps =
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gst_pad_get_allowed_caps (GST_VAAPI_PLUGIN_BASE_SRC_PAD (encode));
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if (allowed_caps == template_caps) {
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GST_INFO_OBJECT (encode, "downstream has ANY caps, outputting byte-stream");
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encode->is_avc = FALSE;
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gst_caps_unref (allowed_caps);
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} else if (!allowed_caps) {
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GST_INFO_OBJECT (encode,
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"downstream has NULL caps, outputting byte-stream");
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encode->is_avc = FALSE;
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} else if (gst_caps_is_empty (allowed_caps)) {
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GST_INFO_OBJECT (encode, "downstream has EMPTY caps");
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goto fail;
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} else {
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const char *stream_format = NULL;
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GstStructure *structure;
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GstVaapiProfile profile = GST_VAAPI_PROFILE_UNKNOWN;
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GstCaps *available_caps;
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GstCaps *profile_caps;
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available_caps = get_available_caps (encode);
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if (!available_caps)
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goto fail;
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if (!gst_caps_can_intersect (allowed_caps, available_caps)) {
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GstCaps *tmp_caps;
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GST_INFO_OBJECT (encode, "downstream may have requested an unsupported "
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"profile. Encoder will try to output a compatible one");
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/* Let's try the best profile in the allowed caps.
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* The internal encoder will fail later if it can't handle it */
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profile = find_best_profile (allowed_caps);
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if (profile == GST_VAAPI_PROFILE_UNKNOWN)
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goto fail;
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/* if allwed caps request baseline (which is deprecated), the
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* encoder will try with constrained baseline which is
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* compatible. */
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if (profile == GST_VAAPI_PROFILE_H264_BASELINE)
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profile = GST_VAAPI_PROFILE_H264_CONSTRAINED_BASELINE;
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tmp_caps = gst_caps_from_string (GST_CODEC_CAPS);
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gst_caps_set_simple (tmp_caps, "profile", G_TYPE_STRING,
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gst_vaapi_profile_get_name (profile), NULL);
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if (!gst_vaapi_encoder_h264_supports_avc (encoder)) {
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gst_caps_set_simple (tmp_caps, "stream-format", G_TYPE_STRING,
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"byte-stream", NULL);
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}
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profile_caps = gst_caps_intersect (available_caps, tmp_caps);
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gst_caps_unref (tmp_caps);
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if (gst_caps_is_empty (profile_caps)) {
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gst_caps_unref (profile_caps);
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goto fail;
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}
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} else {
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profile_caps = gst_caps_intersect (allowed_caps, available_caps);
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profile = find_best_profile (profile_caps);
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}
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profile_caps = gst_caps_fixate (profile_caps);
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structure = gst_caps_get_structure (profile_caps, 0);
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stream_format = gst_structure_get_string (structure, "stream-format");
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encode->is_avc = (g_strcmp0 (stream_format, "avc") == 0);
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if (gst_structure_has_field (structure, "level")) {
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/* @TODO(victor): add a mechansim for user set a specific
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* level */
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GST_WARNING_OBJECT (encode, "cannot set level configuration");
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ret = FALSE;
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} else if (profile != GST_VAAPI_PROFILE_UNKNOWN) {
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GST_INFO ("using %s profile as target decoder constraints",
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gst_vaapi_utils_h264_get_profile_string (profile));
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ret = gst_vaapi_encoder_h264_set_max_profile (encoder, profile);
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} else {
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ret = FALSE;
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}
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gst_caps_unref (profile_caps);
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gst_caps_unref (allowed_caps);
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}
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gst_caps_unref (template_caps);
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base_encode->need_codec_data = encode->is_avc;
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return ret;
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fail:
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{
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gst_caps_unref (template_caps);
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gst_caps_unref (allowed_caps);
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return FALSE;
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}
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}
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static void
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set_compatible_profile (GstVaapiEncodeH264 * encode, GstCaps * caps,
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GstVaapiProfile profile, GstVaapiLevelH264 level)
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{
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GstCaps *allowed_caps, *tmp_caps;
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gboolean ret = FALSE;
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allowed_caps =
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gst_pad_get_allowed_caps (GST_VAAPI_PLUGIN_BASE_SRC_PAD (encode));
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if (!allowed_caps || gst_caps_is_empty (allowed_caps)) {
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if (allowed_caps)
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gst_caps_unref (allowed_caps);
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return;
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}
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tmp_caps = gst_caps_from_string (GST_CODEC_CAPS);
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/* If profile doesn't exist in the allowed caps, let's find
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* compatible profile in the caps.
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*
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* If there is one, we can set it as a compatible profile and make
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* the negotiation. We consider baseline compatible with
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* constrained-baseline, which is a strict subset of baseline
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* profile.
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*/
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retry:
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gst_caps_set_simple (tmp_caps, "profile", G_TYPE_STRING,
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gst_vaapi_utils_h264_get_profile_string (profile), NULL);
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if (!gst_caps_can_intersect (allowed_caps, tmp_caps)) {
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if (profile == GST_VAAPI_PROFILE_H264_CONSTRAINED_BASELINE) {
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profile = GST_VAAPI_PROFILE_H264_BASELINE;
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GST_WARNING_OBJECT (GST_VAAPIENCODE_CAST (encode), "user might requested "
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"baseline profile, trying constrained-baseline instead");
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goto retry;
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}
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} else {
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gst_caps_set_simple (caps, "profile", G_TYPE_STRING,
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gst_vaapi_utils_h264_get_profile_string (profile),
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"level", G_TYPE_STRING, gst_vaapi_utils_h264_get_level_string (level),
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NULL);
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ret = TRUE;
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}
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if (!ret)
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GST_LOG ("There is no compatible profile in the requested caps.");
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gst_caps_unref (tmp_caps);
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gst_caps_unref (allowed_caps);
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return;
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}
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static GstCaps *
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gst_vaapiencode_h264_get_caps (GstVaapiEncode * base_encode)
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{
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GstVaapiEncodeH264 *const encode = GST_VAAPIENCODE_H264_CAST (base_encode);
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GstVaapiEncoderH264 *const encoder =
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GST_VAAPI_ENCODER_H264 (base_encode->encoder);
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GstVaapiProfile profile;
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GstVaapiLevelH264 level;
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GstCaps *caps;
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caps = gst_caps_from_string (GST_CODEC_CAPS);
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gst_caps_set_simple (caps, "stream-format", G_TYPE_STRING,
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encode->is_avc ? "avc" : "byte-stream", NULL);
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/* Update profile determined by encoder */
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gst_vaapi_encoder_h264_get_profile_and_level (encoder, &profile, &level);
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if (profile != GST_VAAPI_PROFILE_UNKNOWN)
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set_compatible_profile (encode, caps, profile, level);
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GST_INFO_OBJECT (base_encode, "out caps %" GST_PTR_FORMAT, caps);
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return caps;
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}
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static GstVaapiEncoder *
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gst_vaapiencode_h264_alloc_encoder (GstVaapiEncode * base,
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GstVaapiDisplay * display)
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{
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return gst_vaapi_encoder_h264_new (display);
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}
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/* h264 NAL byte stream operations */
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static guint8 *
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_h264_byte_stream_next_nal (guint8 * buffer, guint32 len, guint32 * nal_size)
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{
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const guint8 *cur = buffer;
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const guint8 *const end = buffer + len;
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guint8 *nal_start = NULL;
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guint32 flag = 0xFFFFFFFF;
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guint32 nal_start_len = 0;
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g_assert (buffer && nal_size);
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if (len < 3) {
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*nal_size = len;
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nal_start = (len ? buffer : NULL);
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return nal_start;
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}
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/*locate head postion */
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if (!buffer[0] && !buffer[1]) {
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if (buffer[2] == 1) { /* 0x000001 */
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nal_start_len = 3;
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} else if (!buffer[2] && len >= 4 && buffer[3] == 1) { /* 0x00000001 */
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nal_start_len = 4;
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}
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}
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nal_start = buffer + nal_start_len;
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cur = nal_start;
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/*find next nal start position */
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while (cur < end) {
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flag = ((flag << 8) | ((*cur++) & 0xFF));
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if ((flag & 0x00FFFFFF) == 0x00000001) {
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if (flag == 0x00000001)
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*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;
|
|
|
|
/* 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 = GST_CAPS_CAST (data);
|
|
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;
|
|
|
|
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);
|
|
gst_element_class_add_pad_template (element_class,
|
|
gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, sink_caps));
|
|
gst_caps_unref (sink_caps);
|
|
|
|
/* src pad */
|
|
gst_element_class_add_static_pad_template (element_class,
|
|
&gst_vaapiencode_h264_src_factory);
|
|
|
|
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);
|
|
}
|