lavc: VAAPI H.264 encoder

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Changelog

@@ -53,6 +53,7 @@ version <next>:
 - compressed SWF
 - VAAPI-accelerated format conversion and scaling
 - libnpp/CUDA-accelerated format conversion and scaling
+- VAAPI-accelerate H.264 encoding
 
 
 version 11:

configure

@@ -1956,6 +1956,8 @@ h264_qsv_decoder_deps="libmfx"
 h264_qsv_decoder_select="h264_mp4toannexb_bsf h264_parser qsvdec h264_qsv_hwaccel"
 h264_qsv_encoder_deps="libmfx"
 h264_qsv_encoder_select="qsvenc"
+h264_vaapi_encoder_deps="VAEncPictureParameterBufferH264"
+h264_vaapi_encoder_select="vaapi_encode golomb"
 hap_decoder_select="snappy texturedsp"
 hap_encoder_deps="libsnappy"
 hap_encoder_select="texturedspenc"
@@ -4467,6 +4469,7 @@ check_type "windows.h d3d11.h" "ID3D11VideoDecoder"
 check_type "d3d9.h dxva2api.h" DXVA2_ConfigPictureDecode -D_WIN32_WINNT=0x0602
 
 check_type "va/va.h va/va_vpp.h" "VAProcPipelineParameterBuffer"
+check_type "va/va.h va/va_enc_h264.h" "VAEncPictureParameterBufferH264"
 
 check_type "vdpau/vdpau.h" "VdpPictureInfoHEVC"
 

libavcodec/Makefile

@@ -259,6 +259,7 @@ OBJS-$(CONFIG_H264_MMAL_DECODER)       += mmaldec.o
 OBJS-$(CONFIG_H264_NVENC_ENCODER)      += nvenc_h264.o
 OBJS-$(CONFIG_H264_QSV_DECODER)        += qsvdec_h2645.o
 OBJS-$(CONFIG_H264_QSV_ENCODER)        += qsvenc_h264.o
+OBJS-$(CONFIG_H264_VAAPI_ENCODER)      += vaapi_encode_h264.o vaapi_encode_h26x.o
 OBJS-$(CONFIG_HAP_DECODER)             += hapdec.o hap.o
 OBJS-$(CONFIG_HAP_ENCODER)             += hapenc.o hap.o
 OBJS-$(CONFIG_HEVC_DECODER)            += hevc.o hevc_mvs.o hevc_ps.o hevc_sei.o \

libavcodec/allcodecs.c

@@ -166,6 +166,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER(H264,              h264);
     REGISTER_DECODER(H264_MMAL,         h264_mmal);
     REGISTER_DECODER(H264_QSV,          h264_qsv);
+    REGISTER_ENCODER(H264_VAAPI,        h264_vaapi);
     REGISTER_ENCDEC (HAP,               hap);
     REGISTER_DECODER(HEVC,              hevc);
     REGISTER_DECODER(HEVC_QSV,          hevc_qsv);

libavcodec/vaapi_encode_h264.c

+/*
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <va/va.h>
+#include <va/va_enc_h264.h>
+
+#include "libavutil/avassert.h"
+#include "libavutil/internal.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixfmt.h"
+
+#include "avcodec.h"
+#include "h264.h"
+#include "internal.h"
+#include "vaapi_encode.h"
+#include "vaapi_encode_h26x.h"
+
+enum {
+    SLICE_TYPE_P  = 0,
+    SLICE_TYPE_B  = 1,
+    SLICE_TYPE_I  = 2,
+    SLICE_TYPE_SP = 3,
+    SLICE_TYPE_SI = 4,
+};
+
+// This structure contains all possibly-useful per-sequence syntax elements
+// which are not already contained in the various VAAPI structures.
+typedef struct VAAPIEncodeH264MiscSequenceParams {
+    unsigned int profile_idc;
+    char constraint_set0_flag;
+    char constraint_set1_flag;
+    char constraint_set2_flag;
+    char constraint_set3_flag;
+    char constraint_set4_flag;
+    char constraint_set5_flag;
+
+    char separate_colour_plane_flag;
+    char qpprime_y_zero_transform_bypass_flag;
+
+    char gaps_in_frame_num_allowed_flag;
+    char delta_pic_order_always_zero_flag;
+    char bottom_field_pic_order_in_frame_present_flag;
+
+    unsigned int num_slice_groups_minus1;
+    unsigned int slice_group_map_type;
+
+    int pic_init_qs_minus26;
+
+    char vui_parameters_present_flag;
+} VAAPIEncodeH264MiscSequenceParams;
+
+// This structure contains all possibly-useful per-slice syntax elements
+// which are not already contained in the various VAAPI structures.
+typedef struct VAAPIEncodeH264MiscSliceParams {
+    unsigned int nal_unit_type;
+    unsigned int nal_ref_idc;
+
+    unsigned int colour_plane_id;
+    char field_pic_flag;
+    char bottom_field_flag;
+
+    unsigned int redundant_pic_cnt;
+
+    char sp_for_switch_flag;
+    int slice_qs_delta;
+
+    char ref_pic_list_modification_flag_l0;
+    char ref_pic_list_modification_flag_l1;
+
+    char no_output_of_prior_pics_flag;
+    char long_term_reference_flag;
+    char adaptive_ref_pic_marking_mode_flag;
+} VAAPIEncodeH264MiscSliceParams;
+
+typedef struct VAAPIEncodeH264Slice {
+    VAAPIEncodeH264MiscSliceParams misc_slice_params;
+} VAAPIEncodeH264Slice;
+
+typedef struct VAAPIEncodeH264Context {
+    VAAPIEncodeH264MiscSequenceParams misc_sequence_params;
+
+    int mb_width;
+    int mb_height;
+
+    int fixed_qp_idr;
+    int fixed_qp_p;
+    int fixed_qp_b;
+
+    int64_t idr_pic_count;
+    int64_t last_idr_frame;
+
+    // RefPicList management.
+} VAAPIEncodeH264Context;
+
+
+#define vseq_var(name)     vseq->name, name
+#define vseq_field(name)   vseq->seq_fields.bits.name, name
+#define vpic_var(name)     vpic->name, name
+#define vpic_field(name)   vpic->pic_fields.bits.name, name
+#define vslice_var(name)   vslice->name, name
+#define vslice_field(name) vslice->slice_fields.bits.name, name
+#define mseq_var(name)     mseq->name, name
+#define mslice_var(name)   mslice->name, name
+
+static void vaapi_encode_h264_write_nal_header(PutBitContext *pbc,
+                                               int nal_unit_type, int nal_ref_idc)
+{
+    u(1, 0, forbidden_zero_bit);
+    u(2, nal_ref_idc, nal_ref_idc);
+    u(5, nal_unit_type, nal_unit_type);
+}
+
+static void vaapi_encode_h264_write_trailing_rbsp(PutBitContext *pbc)
+{
+    u(1, 1, rbsp_stop_one_bit);
+    while (put_bits_count(pbc) & 7)
+        u(1, 0, rbsp_alignment_zero_bit);
+}
+
+static void vaapi_encode_h264_write_sps(PutBitContext *pbc,
+                                        VAAPIEncodeContext *ctx)
+{
+    VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
+    VAAPIEncodeH264Context            *priv = ctx->priv_data;
+    VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
+    int i;
+
+    vaapi_encode_h264_write_nal_header(pbc, NAL_SPS, 3);
+
+    u(8, mseq_var(profile_idc));
+    u(1, mseq_var(constraint_set0_flag));
+    u(1, mseq_var(constraint_set1_flag));
+    u(1, mseq_var(constraint_set2_flag));
+    u(1, mseq_var(constraint_set3_flag));
+    u(1, mseq_var(constraint_set4_flag));
+    u(1, mseq_var(constraint_set5_flag));
+    u(2, 0, reserved_zero_2bits);
+
+    u(8, vseq_var(level_idc));
+
+    ue(vseq_var(seq_parameter_set_id));
+
+    if (mseq->profile_idc == 100 || mseq->profile_idc == 110 ||
+        mseq->profile_idc == 122 || mseq->profile_idc == 244 ||
+        mseq->profile_idc ==  44 || mseq->profile_idc ==  83 ||
+        mseq->profile_idc ==  86 || mseq->profile_idc == 118 ||
+        mseq->profile_idc == 128 || mseq->profile_idc == 138) {
+        ue(vseq_field(chroma_format_idc));
+
+        if (vseq->seq_fields.bits.chroma_format_idc == 3)
+            u(1, mseq_var(separate_colour_plane_flag));
+
+        ue(vseq_var(bit_depth_luma_minus8));
+        ue(vseq_var(bit_depth_chroma_minus8));
+
+        u(1, mseq_var(qpprime_y_zero_transform_bypass_flag));
+
+        u(1, vseq_field(seq_scaling_matrix_present_flag));
+        if (vseq->seq_fields.bits.seq_scaling_matrix_present_flag) {
+            av_assert0(0 && "scaling matrices not supported");
+        }
+    }
+
+    ue(vseq_field(log2_max_frame_num_minus4));
+    ue(vseq_field(pic_order_cnt_type));
+
+    if (vseq->seq_fields.bits.pic_order_cnt_type == 0) {
+        ue(vseq_field(log2_max_pic_order_cnt_lsb_minus4));
+    } else if (vseq->seq_fields.bits.pic_order_cnt_type == 1) {
+        u(1, mseq_var(delta_pic_order_always_zero_flag));
+        se(vseq_var(offset_for_non_ref_pic));
+        se(vseq_var(offset_for_top_to_bottom_field));
+        ue(vseq_var(num_ref_frames_in_pic_order_cnt_cycle));
+
+        for (i = 0; i < vseq->num_ref_frames_in_pic_order_cnt_cycle; i++)
+            se(vseq_var(offset_for_ref_frame[i]));
+    }
+
+    ue(vseq_var(max_num_ref_frames));
+    u(1, mseq_var(gaps_in_frame_num_allowed_flag));
+
+    ue(vseq->picture_width_in_mbs  - 1, pic_width_in_mbs_minus1);
+    ue(vseq->picture_height_in_mbs - 1, pic_height_in_mbs_minus1);
+
+    u(1, vseq_field(frame_mbs_only_flag));
+    if (!vseq->seq_fields.bits.frame_mbs_only_flag)
+        u(1, vseq_field(mb_adaptive_frame_field_flag));
+
+    u(1, vseq_field(direct_8x8_inference_flag));
+
+    u(1, vseq_var(frame_cropping_flag));
+    if (vseq->frame_cropping_flag) {
+        ue(vseq_var(frame_crop_left_offset));
+        ue(vseq_var(frame_crop_right_offset));
+        ue(vseq_var(frame_crop_top_offset));
+        ue(vseq_var(frame_crop_bottom_offset));
+    }
+
+    u(1, mseq_var(vui_parameters_present_flag));
+
+    vaapi_encode_h264_write_trailing_rbsp(pbc);
+}
+
+static void vaapi_encode_h264_write_pps(PutBitContext *pbc,
+                                        VAAPIEncodeContext *ctx)
+{
+    VAEncPictureParameterBufferH264   *vpic = ctx->codec_picture_params;
+    VAAPIEncodeH264Context            *priv = ctx->priv_data;
+    VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
+
+    vaapi_encode_h264_write_nal_header(pbc, NAL_PPS, 3);
+
+    ue(vpic_var(pic_parameter_set_id));
+    ue(vpic_var(seq_parameter_set_id));
+
+    u(1, vpic_field(entropy_coding_mode_flag));
+    u(1, mseq_var(bottom_field_pic_order_in_frame_present_flag));
+
+    ue(mseq_var(num_slice_groups_minus1));
+    if (mseq->num_slice_groups_minus1 > 0) {
+        ue(mseq_var(slice_group_map_type));
+        av_assert0(0 && "slice groups not supported");
+    }
+
+    ue(vpic_var(num_ref_idx_l0_active_minus1));
+    ue(vpic_var(num_ref_idx_l1_active_minus1));
+
+    u(1, vpic_field(weighted_pred_flag));
+    u(2, vpic_field(weighted_bipred_idc));
+
+    se(vpic->pic_init_qp - 26, pic_init_qp_minus26);
+    se(mseq_var(pic_init_qs_minus26));
+    se(vpic_var(chroma_qp_index_offset));
+
+    u(1, vpic_field(deblocking_filter_control_present_flag));
+    u(1, vpic_field(constrained_intra_pred_flag));
+    u(1, vpic_field(redundant_pic_cnt_present_flag));
+    u(1, vpic_field(transform_8x8_mode_flag));
+
+    u(1, vpic_field(pic_scaling_matrix_present_flag));
+    if (vpic->pic_fields.bits.pic_scaling_matrix_present_flag) {
+        av_assert0(0 && "scaling matrices not supported");
+    }
+
+    se(vpic_var(second_chroma_qp_index_offset));
+
+    vaapi_encode_h264_write_trailing_rbsp(pbc);
+}
+
+static void vaapi_encode_h264_write_slice_header2(PutBitContext *pbc,
+                                                  VAAPIEncodeContext *ctx,
+                                                  VAAPIEncodePicture *pic,
+                                                  VAAPIEncodeSlice *slice)
+{
+    VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
+    VAEncPictureParameterBufferH264   *vpic = pic->codec_picture_params;
+    VAEncSliceParameterBufferH264   *vslice = slice->codec_slice_params;
+    VAAPIEncodeH264Context            *priv = ctx->priv_data;
+    VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
+    VAAPIEncodeH264Slice            *pslice = slice->priv_data;
+    VAAPIEncodeH264MiscSliceParams  *mslice = &pslice->misc_slice_params;
+
+    vaapi_encode_h264_write_nal_header(pbc, mslice->nal_unit_type,
+                                       mslice->nal_ref_idc);
+
+    ue(vslice->macroblock_address, first_mb_in_slice);
+    ue(vslice_var(slice_type));
+    ue(vpic_var(pic_parameter_set_id));
+
+    if (mseq->separate_colour_plane_flag) {
+        u(2, mslice_var(colour_plane_id));
+    }
+
+    u(4 + vseq->seq_fields.bits.log2_max_frame_num_minus4,
+      (vpic->frame_num &
+       ((1 << (4 + vseq->seq_fields.bits.log2_max_frame_num_minus4)) - 1)),
+      frame_num);
+
+    if (!vseq->seq_fields.bits.frame_mbs_only_flag) {
+        u(1, mslice_var(field_pic_flag));
+        if (mslice->field_pic_flag)
+            u(1, mslice_var(bottom_field_flag));
+    }
+
+    if (vpic->pic_fields.bits.idr_pic_flag) {
+        ue(vslice_var(idr_pic_id));
+    }
+
+    if (vseq->seq_fields.bits.pic_order_cnt_type == 0) {
+        u(4 + vseq->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4,
+          vslice_var(pic_order_cnt_lsb));
+        if (mseq->bottom_field_pic_order_in_frame_present_flag &&
+            !mslice->field_pic_flag) {
+            se(vslice_var(delta_pic_order_cnt_bottom));
+        }
+    }
+
+    if (vseq->seq_fields.bits.pic_order_cnt_type == 1 &&
+        !vseq->seq_fields.bits.delta_pic_order_always_zero_flag) {
+        se(vslice_var(delta_pic_order_cnt[0]));
+        if (mseq->bottom_field_pic_order_in_frame_present_flag &&
+            !mslice->field_pic_flag) {
+            se(vslice_var(delta_pic_order_cnt[1]));
+        }
+    }
+
+    if (vpic->pic_fields.bits.redundant_pic_cnt_present_flag) {
+        ue(mslice_var(redundant_pic_cnt));
+    }
+
+    if (vslice->slice_type == SLICE_TYPE_B) {
+        u(1, vslice_var(direct_spatial_mv_pred_flag));
+    }
+
+    if (vslice->slice_type == SLICE_TYPE_P ||
+        vslice->slice_type == SLICE_TYPE_SP ||
+        vslice->slice_type == SLICE_TYPE_B) {
+        u(1, vslice_var(num_ref_idx_active_override_flag));
+        if (vslice->num_ref_idx_active_override_flag) {
+            ue(vslice_var(num_ref_idx_l0_active_minus1));
+            if (vslice->slice_type == SLICE_TYPE_B)
+                ue(vslice_var(num_ref_idx_l1_active_minus1));
+        }
+    }
+
+    if (mslice->nal_unit_type == 20 || mslice->nal_unit_type == 21) {
+        av_assert0(0 && "no MVC support");
+    } else {
+        if (vslice->slice_type % 5 != 2 && vslice->slice_type % 5 != 4) {
+            u(1, mslice_var(ref_pic_list_modification_flag_l0));
+            if (mslice->ref_pic_list_modification_flag_l0) {
+                av_assert0(0 && "ref pic list modification");
+            }
+        }
+        if (vslice->slice_type % 5 == 1) {
+            u(1, mslice_var(ref_pic_list_modification_flag_l1));
+            if (mslice->ref_pic_list_modification_flag_l1) {
+                av_assert0(0 && "ref pic list modification");
+            }
+        }
+    }
+
+    if ((vpic->pic_fields.bits.weighted_pred_flag &&
+         (vslice->slice_type == SLICE_TYPE_P ||
+          vslice->slice_type == SLICE_TYPE_SP)) ||
+        (vpic->pic_fields.bits.weighted_bipred_idc == 1 &&
+         vslice->slice_type == SLICE_TYPE_B)) {
+        av_assert0(0 && "prediction weights not supported");
+    }
+
+    av_assert0(mslice->nal_ref_idc > 0 ==
+               vpic->pic_fields.bits.reference_pic_flag);
+    if (mslice->nal_ref_idc != 0) {
+        if (vpic->pic_fields.bits.idr_pic_flag) {
+            u(1, mslice_var(no_output_of_prior_pics_flag));
+            u(1, mslice_var(long_term_reference_flag));
+        } else {
+            u(1, mslice_var(adaptive_ref_pic_marking_mode_flag));
+            if (mslice->adaptive_ref_pic_marking_mode_flag) {
+                av_assert0(0 && "MMCOs not supported");
+            }
+        }
+    }
+
+    if (vpic->pic_fields.bits.entropy_coding_mode_flag &&
+        vslice->slice_type != SLICE_TYPE_I &&
+        vslice->slice_type != SLICE_TYPE_SI) {
+        ue(vslice_var(cabac_init_idc));
+    }
+
+    se(vslice_var(slice_qp_delta));
+    if (vslice->slice_type == SLICE_TYPE_SP ||
+        vslice->slice_type == SLICE_TYPE_SI) {
+        if (vslice->slice_type == SLICE_TYPE_SP)
+            u(1, mslice_var(sp_for_switch_flag));
+        se(mslice_var(slice_qs_delta));
+    }
+
+    if (vpic->pic_fields.bits.deblocking_filter_control_present_flag) {
+        ue(vslice_var(disable_deblocking_filter_idc));
+        if (vslice->disable_deblocking_filter_idc != 1) {
+            se(vslice_var(slice_alpha_c0_offset_div2));
+            se(vslice_var(slice_beta_offset_div2));
+        }
+    }
+
+    if (mseq->num_slice_groups_minus1 > 0 &&
+        mseq->slice_group_map_type >= 3 && mseq->slice_group_map_type <= 5) {
+        av_assert0(0 && "slice groups not supported");
+    }
+
+    // No alignment - this need not be a byte boundary.
+}
+
+static int vaapi_encode_h264_write_sequence_header(AVCodecContext *avctx,
+                                                   char *data, size_t *data_len)
+{
+    VAAPIEncodeContext *ctx = avctx->priv_data;
+    PutBitContext pbc;
+    char tmp[256];
+    int err;
+    size_t nal_len, bit_len, bit_pos, next_len;
+
+    bit_len = *data_len;
+    bit_pos = 0;
+
+    init_put_bits(&pbc, tmp, sizeof(tmp));
+    vaapi_encode_h264_write_sps(&pbc, ctx);
+    nal_len = put_bits_count(&pbc);
+    flush_put_bits(&pbc);
+
+    next_len = bit_len - bit_pos;
+    err = ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data + bit_pos / 8,
+                                                       &next_len,
+                                                       tmp, nal_len);
+    if (err < 0)
+        return err;
+    bit_pos += next_len;
+
+    init_put_bits(&pbc, tmp, sizeof(tmp));
+    vaapi_encode_h264_write_pps(&pbc, ctx);
+    nal_len = put_bits_count(&pbc);
+    flush_put_bits(&pbc);
+
+    next_len = bit_len - bit_pos;
+    err = ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data + bit_pos / 8,
+                                                       &next_len,
+                                                       tmp, nal_len);
+    if (err < 0)
+        return err;
+    bit_pos += next_len;
+
+    *data_len = bit_pos;
+    return 0;
+}
+
+static int vaapi_encode_h264_write_slice_header(AVCodecContext *avctx,
+                                                VAAPIEncodePicture *pic,
+                                                VAAPIEncodeSlice *slice,
+                                                char *data, size_t *data_len)
+{
+    VAAPIEncodeContext *ctx = avctx->priv_data;
+    PutBitContext pbc;
+    char tmp[256];
+    size_t header_len;
+
+    init_put_bits(&pbc, tmp, sizeof(tmp));
+    vaapi_encode_h264_write_slice_header2(&pbc, ctx, pic, slice);
+    header_len = put_bits_count(&pbc);
+    flush_put_bits(&pbc);
+
+    return ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data, data_len,
+                                                        tmp, header_len);
+}
+
+static int vaapi_encode_h264_init_sequence_params(AVCodecContext *avctx)
+{
+    VAAPIEncodeContext                 *ctx = avctx->priv_data;
+    VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
+    VAEncPictureParameterBufferH264   *vpic = ctx->codec_picture_params;
+    VAAPIEncodeH264Context            *priv = ctx->priv_data;
+    VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
+    int i;
+
+    {
+        vseq->seq_parameter_set_id = 0;
+
+        vseq->level_idc = avctx->level;
+
+        vseq->max_num_ref_frames = 2;
+
+        vseq->picture_width_in_mbs  = priv->mb_width;
+        vseq->picture_height_in_mbs = priv->mb_height;
+
+        vseq->seq_fields.bits.chroma_format_idc = 1;
+        vseq->seq_fields.bits.frame_mbs_only_flag = 1;
+        vseq->seq_fields.bits.direct_8x8_inference_flag = 1;
+        vseq->seq_fields.bits.log2_max_frame_num_minus4 = 4;
+        vseq->seq_fields.bits.pic_order_cnt_type = 0;
+
+        if (ctx->input_width  != ctx->aligned_width ||
+            ctx->input_height != ctx->aligned_height) {
+            vseq->frame_cropping_flag = 1;
+
+            vseq->frame_crop_left_offset   = 0;
+            vseq->frame_crop_right_offset  =
+                (ctx->aligned_width - ctx->input_width) / 2;
+            vseq->frame_crop_top_offset    = 0;
+            vseq->frame_crop_bottom_offset =
+                (ctx->aligned_height - ctx->input_height) / 2;
+        } else {
+            vseq->frame_cropping_flag = 0;
+        }
+    }
+
+    {
+        vpic->CurrPic.picture_id = VA_INVALID_ID;
+        vpic->CurrPic.flags      = VA_PICTURE_H264_INVALID;
+
+        for (i = 0; i < FF_ARRAY_ELEMS(vpic->ReferenceFrames); i++) {
+            vpic->ReferenceFrames[i].picture_id = VA_INVALID_ID;
+            vpic->ReferenceFrames[i].flags      = VA_PICTURE_H264_INVALID;
+        }
+
+        vpic->coded_buf = VA_INVALID_ID;
+
+        vpic->pic_parameter_set_id = 0;
+        vpic->seq_parameter_set_id = 0;
+
+        vpic->num_ref_idx_l0_active_minus1 = 0;
+        vpic->num_ref_idx_l1_active_minus1 = 0;
+
+        vpic->pic_fields.bits.entropy_coding_mode_flag =
+            ((avctx->profile & 0xff) != 66);
+        vpic->pic_fields.bits.weighted_pred_flag = 0;
+        vpic->pic_fields.bits.weighted_bipred_idc = 0;
+        vpic->pic_fields.bits.transform_8x8_mode_flag =
+            ((avctx->profile & 0xff) >= 100);
+
+        vpic->pic_init_qp = priv->fixed_qp_idr;
+    }
+
+    {
+        mseq->profile_idc = avctx->profile & 0xff;
+
+        if (avctx->profile & FF_PROFILE_H264_CONSTRAINED)
+            mseq->constraint_set1_flag = 1;
+        if (avctx->profile & FF_PROFILE_H264_INTRA)
+            mseq->constraint_set3_flag = 1;
+    }
+
+    return 0;
+}
+
+static int vaapi_encode_h264_init_picture_params(AVCodecContext *avctx,
+                                                 VAAPIEncodePicture *pic)
+{
+    VAAPIEncodeContext                *ctx = avctx->priv_data;
+    VAEncSequenceParameterBufferH264 *vseq = ctx->codec_sequence_params;
+    VAEncPictureParameterBufferH264  *vpic = pic->codec_picture_params;
+    VAAPIEncodeH264Context           *priv = ctx->priv_data;
+    int i;
+
+    if (pic->type == PICTURE_TYPE_IDR) {
+        av_assert0(pic->display_order == pic->encode_order);
+        priv->last_idr_frame = pic->display_order;
+    } else {
+        av_assert0(pic->display_order > priv->last_idr_frame);
+    }
+
+    vpic->frame_num = (pic->encode_order - priv->last_idr_frame) &
+        ((1 << (4 + vseq->seq_fields.bits.log2_max_frame_num_minus4)) - 1);
+
+    vpic->CurrPic.picture_id          = pic->recon_surface;
+    vpic->CurrPic.frame_idx           = vpic->frame_num;
+    vpic->CurrPic.flags               = 0;
+    vpic->CurrPic.TopFieldOrderCnt    = pic->display_order;
+    vpic->CurrPic.BottomFieldOrderCnt = pic->display_order;
+
+    for (i = 0; i < pic->nb_refs; i++) {
+        VAAPIEncodePicture *ref = pic->refs[i];
+        av_assert0(ref && ref->encode_order >= priv->last_idr_frame);
+        vpic->ReferenceFrames[i].picture_id = ref->recon_surface;
+        vpic->ReferenceFrames[i].frame_idx =
+            ref->encode_order - priv->last_idr_frame;
+        vpic->ReferenceFrames[i].flags = VA_PICTURE_H264_SHORT_TERM_REFERENCE;
+        vpic->ReferenceFrames[i].TopFieldOrderCnt    = ref->display_order;
+        vpic->ReferenceFrames[i].BottomFieldOrderCnt = ref->display_order;
+    }
+    for (; i < FF_ARRAY_ELEMS(vpic->ReferenceFrames); i++) {
+        vpic->ReferenceFrames[i].picture_id = VA_INVALID_ID;
+        vpic->ReferenceFrames[i].flags = VA_PICTURE_H264_INVALID;
+    }
+
+    vpic->coded_buf = pic->output_buffer;
+
+    vpic->pic_fields.bits.idr_pic_flag = (pic->type == PICTURE_TYPE_IDR);
+    vpic->pic_fields.bits.reference_pic_flag = (pic->type != PICTURE_TYPE_B);
+
+    pic->nb_slices = 1;
+
+    return 0;
+}
+
+static int vaapi_encode_h264_init_slice_params(AVCodecContext *avctx,
+                                               VAAPIEncodePicture *pic,
+                                               VAAPIEncodeSlice *slice)
+{
+    VAAPIEncodeContext                 *ctx = avctx->priv_data;
+    VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
+    VAEncPictureParameterBufferH264   *vpic = pic->codec_picture_params;
+    VAEncSliceParameterBufferH264   *vslice = slice->codec_slice_params;
+    VAAPIEncodeH264Context            *priv = ctx->priv_data;
+    VAAPIEncodeH264Slice            *pslice;
+    VAAPIEncodeH264MiscSliceParams  *mslice;
+    int i;
+
+    slice->priv_data = av_mallocz(sizeof(*pslice));
+    if (!slice->priv_data)
+        return AVERROR(ENOMEM);
+    pslice = slice->priv_data;
+    mslice = &pslice->misc_slice_params;
+
+    if (pic->type == PICTURE_TYPE_IDR)
+        mslice->nal_unit_type = NAL_IDR_SLICE;
+    else
+        mslice->nal_unit_type = NAL_SLICE;
+
+    switch (pic->type) {
+    case PICTURE_TYPE_IDR:
+        vslice->slice_type  = SLICE_TYPE_I;
+        mslice->nal_ref_idc = 3;
+        break;
+    case PICTURE_TYPE_I:
+        vslice->slice_type  = SLICE_TYPE_I;
+        mslice->nal_ref_idc = 2;
+        break;
+    case PICTURE_TYPE_P:
+        vslice->slice_type  = SLICE_TYPE_P;
+        mslice->nal_ref_idc = 1;
+        break;
+    case PICTURE_TYPE_B:
+        vslice->slice_type  = SLICE_TYPE_B;
+        mslice->nal_ref_idc = 0;
+        break;
+    default:
+        av_assert0(0 && "invalid picture type");
+    }
+
+    // Only one slice per frame.
+    vslice->macroblock_address = 0;
+    vslice->num_macroblocks = priv->mb_width * priv->mb_height;
+
+    vslice->macroblock_info = VA_INVALID_ID;
+
+    vslice->pic_parameter_set_id = vpic->pic_parameter_set_id;
+    vslice->idr_pic_id = priv->idr_pic_count++;
+
+    vslice->pic_order_cnt_lsb = pic->display_order &
+        ((1 << (4 + vseq->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4)) - 1);
+
+    for (i = 0; i < FF_ARRAY_ELEMS(vslice->RefPicList0); i++) {
+        vslice->RefPicList0[i].picture_id = VA_INVALID_ID;
+        vslice->RefPicList0[i].flags      = VA_PICTURE_H264_INVALID;
+        vslice->RefPicList1[i].picture_id = VA_INVALID_ID;
+        vslice->RefPicList1[i].flags      = VA_PICTURE_H264_INVALID;
+    }
+
+    av_assert0(pic->nb_refs <= 2);
+    if (pic->nb_refs >= 1) {
+        // Backward reference for P or B frame.
+        av_assert0(pic->type == PICTURE_TYPE_P ||
+                   pic->type == PICTURE_TYPE_B);
+
+        vslice->num_ref_idx_l0_active_minus1 = 0;
+        vslice->RefPicList0[0] = vpic->ReferenceFrames[0];
+    }
+    if (pic->nb_refs >= 2) {
+        // Forward reference for B frame.
+        av_assert0(pic->type == PICTURE_TYPE_B);
+
+        vslice->num_ref_idx_l1_active_minus1 = 0;
+        vslice->RefPicList1[0] = vpic->ReferenceFrames[1];
+    }
+
+    if (pic->type == PICTURE_TYPE_B)
+        vslice->slice_qp_delta = priv->fixed_qp_b - vpic->pic_init_qp;
+    else if (pic->type == PICTURE_TYPE_P)
+        vslice->slice_qp_delta = priv->fixed_qp_p - vpic->pic_init_qp;
+    else
+        vslice->slice_qp_delta = priv->fixed_qp_idr - vpic->pic_init_qp;
+
+    vslice->direct_spatial_mv_pred_flag = 1;
+
+    return 0;
+}
+
+static VAConfigAttrib vaapi_encode_h264_config_attributes[] = {
+    { .type  = VAConfigAttribRTFormat,
+      .value = VA_RT_FORMAT_YUV420 },
+    { .type  = VAConfigAttribRateControl,
+      .value = VA_RC_CQP },
+    { .type  = VAConfigAttribEncPackedHeaders,
+      .value = (VA_ENC_PACKED_HEADER_SEQUENCE |
+                VA_ENC_PACKED_HEADER_SLICE) },
+};
+
+static av_cold int vaapi_encode_h264_init_internal(AVCodecContext *avctx)
+{
+    VAAPIEncodeContext      *ctx = avctx->priv_data;
+    VAAPIEncodeH264Context *priv = ctx->priv_data;
+
+    switch (avctx->profile) {
+    case FF_PROFILE_H264_CONSTRAINED_BASELINE:
+        ctx->va_profile = VAProfileH264ConstrainedBaseline;
+        break;
+    case FF_PROFILE_H264_BASELINE:
+        ctx->va_profile = VAProfileH264Baseline;
+        break;
+    case FF_PROFILE_H264_MAIN:
+        ctx->va_profile = VAProfileH264Main;
+        break;
+    case FF_PROFILE_H264_EXTENDED:
+        av_log(avctx, AV_LOG_ERROR, "H.264 extended profile "
+               "is not supported.\n");
+        return AVERROR_PATCHWELCOME;
+    case FF_PROFILE_UNKNOWN:
+    case FF_PROFILE_H264_HIGH:
+        ctx->va_profile = VAProfileH264High;
+        break;
+    case FF_PROFILE_H264_HIGH_10:
+    case FF_PROFILE_H264_HIGH_10_INTRA:
+        av_log(avctx, AV_LOG_ERROR, "H.264 10-bit profiles "
+               "are not supported.\n");
+        return AVERROR_PATCHWELCOME;
+    case FF_PROFILE_H264_HIGH_422:
+    case FF_PROFILE_H264_HIGH_422_INTRA:
+    case FF_PROFILE_H264_HIGH_444:
+    case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
+    case FF_PROFILE_H264_HIGH_444_INTRA:
+    case FF_PROFILE_H264_CAVLC_444:
+        av_log(avctx, AV_LOG_ERROR, "H.264 non-4:2:0 profiles "
+               "are not supported.\n");
+        return AVERROR_PATCHWELCOME;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "Unknown H.264 profile %d.\n",
+               avctx->profile);
+        return AVERROR(EINVAL);
+    }
+    ctx->va_entrypoint = VAEntrypointEncSlice;
+
+    ctx->va_rc_mode  = VA_RC_CQP;
+
+    ctx->input_width    = avctx->width;
+    ctx->input_height   = avctx->height;
+    ctx->aligned_width  = FFALIGN(ctx->input_width,  16);
+    ctx->aligned_height = FFALIGN(ctx->input_height, 16);
+    priv->mb_width      = ctx->aligned_width  / 16;
+    priv->mb_height     = ctx->aligned_height / 16;
+
+    if (avctx->bit_rate > 0) {
+        av_log(avctx, AV_LOG_ERROR, "Constant bitrate encoding is not "
+               "supported!\n");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    priv->fixed_qp_p = avctx->global_quality;
+    if (avctx->i_quant_factor > 0.0)
+        priv->fixed_qp_idr = (int)((priv->fixed_qp_p * avctx->i_quant_factor +
+                                    avctx->i_quant_offset) + 0.5);
+    else
+        priv->fixed_qp_idr = priv->fixed_qp_p;
+    if (avctx->b_quant_factor > 0.0)
+        priv->fixed_qp_b = (int)((priv->fixed_qp_p * avctx->b_quant_factor +
+                                  avctx->b_quant_offset) + 0.5);
+    else
+        priv->fixed_qp_b = priv->fixed_qp_p;
+    av_log(avctx, AV_LOG_DEBUG, "QP = %d / %d / %d for IDR / P / B frames.\n",
+           priv->fixed_qp_idr, priv->fixed_qp_p, priv->fixed_qp_b);
+
+    ctx->config_attributes = vaapi_encode_h264_config_attributes;
+    ctx->nb_config_attributes =
+        FF_ARRAY_ELEMS(vaapi_encode_h264_config_attributes);
+
+    ctx->nb_recon_frames = 20;
+
+    return 0;
+}
+
+static VAAPIEncodeType vaapi_encode_type_h264 = {
+    .priv_data_size        = sizeof(VAAPIEncodeH264Context),
+
+    .init                  = &vaapi_encode_h264_init_internal,
+
+    .sequence_params_size  = sizeof(VAEncSequenceParameterBufferH264),
+    .init_sequence_params  = &vaapi_encode_h264_init_sequence_params,
+
+    .picture_params_size   = sizeof(VAEncPictureParameterBufferH264),
+    .init_picture_params   = &vaapi_encode_h264_init_picture_params,
+
+    .slice_params_size     = sizeof(VAEncSliceParameterBufferH264),
+    .init_slice_params     = &vaapi_encode_h264_init_slice_params,
+
+    .sequence_header_type  = VAEncPackedHeaderSequence,
+    .write_sequence_header = &vaapi_encode_h264_write_sequence_header,
+
+    .slice_header_type     = VAEncPackedHeaderH264_Slice,
+    .write_slice_header    = &vaapi_encode_h264_write_slice_header,
+};
+
+static av_cold int vaapi_encode_h264_init(AVCodecContext *avctx)
+{
+    return ff_vaapi_encode_init(avctx, &vaapi_encode_type_h264);
+}
+
+static const AVCodecDefault vaapi_encode_h264_defaults[] = {
+    { "profile",        "100" },
+    { "level",          "51"  },
+    { "b",              "0"   },
+    { "bf",             "2"   },
+    { "g",              "120" },
+    { "global_quality", "20"  },
+    { "i_qfactor",      "1.0" },
+    { "i_qoffset",      "0.0" },
+    { "b_qfactor",      "1.2" },
+    { "b_qoffset",      "0.0" },
+    { NULL },
+};
+
+static const AVClass vaapi_encode_h264_class = {
+    .class_name = "h264_vaapi",
+    .item_name  = av_default_item_name,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVCodec ff_h264_vaapi_encoder = {
+    .name           = "h264_vaapi",
+    .long_name      = NULL_IF_CONFIG_SMALL("H.264/AVC (VAAPI)"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_H264,
+    .priv_data_size = sizeof(VAAPIEncodeContext),
+    .init           = &vaapi_encode_h264_init,
+    .encode2        = &ff_vaapi_encode2,
+    .close          = &ff_vaapi_encode_close,
+    .priv_class     = &vaapi_encode_h264_class,
+    .capabilities   = AV_CODEC_CAP_DELAY,
+    .defaults       = vaapi_encode_h264_defaults,
+    .pix_fmts = (const enum AVPixelFormat[]) {
+        AV_PIX_FMT_VAAPI,
+        AV_PIX_FMT_NONE,
+    },
+};

libavcodec/vaapi_encode_h26x.c

+/*
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+
+#include "vaapi_encode_h26x.h"
+
+int ff_vaapi_encode_h26x_nal_unit_to_byte_stream(uint8_t *dst, size_t *dst_bit_len,
+                                                 uint8_t *src, size_t src_bit_len)
+{
+    size_t dp, sp;
+    int zero_run = 0;
+    size_t dst_len = *dst_bit_len / 8;
+    size_t src_len = (src_bit_len + 7) / 8;
+    int trailing_zeroes = src_len * 8 - src_bit_len;
+
+    if (dst_len < src_len + 4) {
+        // Definitely doesn't fit.
+        goto fail;
+    }
+
+    // Start code.
+    dst[0] = dst[1] = dst[2] = 0;
+    dst[3] = 1;
+    dp = 4;
+
+    for (sp = 0; sp < src_len; sp++) {
+        if (dp >= dst_len)
+            goto fail;
+        if (zero_run < 2) {
+            if (src[sp] == 0)
+                ++zero_run;
+            else
+                zero_run = 0;
+        } else {
+            if ((src[sp] & ~3) == 0) {
+                // emulation_prevention_three_byte
+                dst[dp++] = 3;
+                if (dp >= dst_len)
+                    goto fail;
+            }
+            zero_run = src[sp] == 0;
+        }
+        dst[dp++] = src[sp];
+    }
+
+    *dst_bit_len = 8 * dp - trailing_zeroes;
+    return 0;
+
+fail:
+    *dst_bit_len = 0;
+    return AVERROR(ENOSPC);
+}

libavcodec/vaapi_encode_h26x.h

+/*
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_VAAPI_ENCODE_H26X_H
+#define AVCODEC_VAAPI_ENCODE_H26X_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "golomb.h"
+#include "put_bits.h"
+
+
+// Debug code may be interested in the name of the syntax element being
+// for tracing purposes.  Here, it is just discarded.
+
+#define write_u(pbc, width, value, name) put_bits(pbc, width, value)
+#define write_ue(pbc, value, name)       set_ue_golomb(pbc, value)
+#define write_se(pbc, value, name)       set_se_golomb(pbc, value)
+
+#define u(width, ...) write_u(pbc, width, __VA_ARGS__)
+#define ue(...)       write_ue(pbc, __VA_ARGS__)
+#define se(...)       write_se(pbc, __VA_ARGS__)
+
+
+// Copy from src to dst, applying emulation prevention.
+int ff_vaapi_encode_h26x_nal_unit_to_byte_stream(uint8_t *dst, size_t *dst_len,
+                                                 uint8_t *src, size_t src_len);
+
+#endif /* AVCODEC_VAAPI_ENCODE_H26X_H */

libavcodec/version.h

@@ -28,7 +28,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 57
-#define LIBAVCODEC_VERSION_MINOR 16
+#define LIBAVCODEC_VERSION_MINOR 17
 #define LIBAVCODEC_VERSION_MICRO  0
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \