ffmpeg/libavcodec/qsvenc.c

/*
 * Intel MediaSDK QSV encoder utility functions
 *
 * copyright (c) 2013 Yukinori Yamazoe
 * copyright (c) 2015 Anton Khirnov
 *
 * 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 <string.h>
#include <sys/types.h>
#include <mfx/mfxvideo.h>

#include "libavutil/common.h"
#include "libavutil/mem.h"
#include "libavutil/log.h"
#include "libavutil/time.h"
#include "libavutil/imgutils.h"

#include "avcodec.h"
#include "internal.h"
#include "qsv.h"
#include "qsv_internal.h"
#include "qsvenc.h"

static const struct {
    mfxU16 profile;
    const char *name;
} profile_names[] = {
    { MFX_PROFILE_AVC_BASELINE,                 "baseline"              },
    { MFX_PROFILE_AVC_MAIN,                     "main"                  },
    { MFX_PROFILE_AVC_EXTENDED,                 "extended"              },
    { MFX_PROFILE_AVC_HIGH,                     "high"                  },
#if QSV_VERSION_ATLEAST(1, 15)
    { MFX_PROFILE_AVC_HIGH_422,                 "high 422"              },
#endif
#if QSV_VERSION_ATLEAST(1, 4)
    { MFX_PROFILE_AVC_CONSTRAINED_BASELINE,     "constrained baseline"  },
    { MFX_PROFILE_AVC_CONSTRAINED_HIGH,         "constrained high"      },
    { MFX_PROFILE_AVC_PROGRESSIVE_HIGH,         "progressive high"      },
#endif
    { MFX_PROFILE_MPEG2_SIMPLE,                 "simple"                },
    { MFX_PROFILE_MPEG2_MAIN,                   "main"                  },
    { MFX_PROFILE_MPEG2_HIGH,                   "high"                  },
    { MFX_PROFILE_VC1_SIMPLE,                   "simple"                },
    { MFX_PROFILE_VC1_MAIN,                     "main"                  },
    { MFX_PROFILE_VC1_ADVANCED,                 "advanced"              },
#if QSV_VERSION_ATLEAST(1, 8)
    { MFX_PROFILE_HEVC_MAIN,                    "main"                  },
    { MFX_PROFILE_HEVC_MAIN10,                  "main10"                },
    { MFX_PROFILE_HEVC_MAINSP,                  "mainsp"                },
#endif
};

static const char *print_profile(mfxU16 profile)
{
    int i;
    for (i = 0; i < FF_ARRAY_ELEMS(profile_names); i++)
        if (profile == profile_names[i].profile)
            return profile_names[i].name;
    return "unknown";
}

static const struct {
    mfxU16      rc_mode;
    const char *name;
} rc_names[] = {
    { MFX_RATECONTROL_CBR,     "CBR" },
    { MFX_RATECONTROL_VBR,     "VBR" },
    { MFX_RATECONTROL_CQP,     "CQP" },
    { MFX_RATECONTROL_AVBR,    "AVBR" },
#if QSV_HAVE_LA
    { MFX_RATECONTROL_LA,      "LA" },
#endif
#if QSV_HAVE_ICQ
    { MFX_RATECONTROL_ICQ,     "ICQ" },
    { MFX_RATECONTROL_LA_ICQ,  "LA_ICQ" },
#endif
#if QSV_HAVE_VCM
    { MFX_RATECONTROL_VCM,     "VCM" },
#endif
#if QSV_VERSION_ATLEAST(1, 10)
    { MFX_RATECONTROL_LA_EXT,  "LA_EXT" },
#endif
#if QSV_HAVE_LA_HRD
    { MFX_RATECONTROL_LA_HRD,  "LA_HRD" },
#endif
#if QSV_HAVE_QVBR
    { MFX_RATECONTROL_QVBR,    "QVBR" },
#endif
};

static const char *print_ratecontrol(mfxU16 rc_mode)
{
    int i;
    for (i = 0; i < FF_ARRAY_ELEMS(rc_names); i++)
        if (rc_mode == rc_names[i].rc_mode)
            return rc_names[i].name;
    return "unknown";
}

static const char *print_threestate(mfxU16 val)
{
    if (val == MFX_CODINGOPTION_ON)
        return "ON";
    else if (val == MFX_CODINGOPTION_OFF)
        return "OFF";
    return "unknown";
}

static void dump_video_param(AVCodecContext *avctx, QSVEncContext *q,
                             mfxExtBuffer **coding_opts)
{
    mfxInfoMFX *info = &q->param.mfx;

    mfxExtCodingOption   *co = (mfxExtCodingOption*)coding_opts[0];
#if QSV_HAVE_CO2
    mfxExtCodingOption2 *co2 = (mfxExtCodingOption2*)coding_opts[1];
#endif
#if QSV_HAVE_CO3
    mfxExtCodingOption3 *co3 = (mfxExtCodingOption3*)coding_opts[2];
#endif

    av_log(avctx, AV_LOG_VERBOSE, "profile: %s; level: %"PRIu16"\n",
           print_profile(info->CodecProfile), info->CodecLevel);

    av_log(avctx, AV_LOG_VERBOSE, "GopPicSize: %"PRIu16"; GopRefDist: %"PRIu16"; GopOptFlag: ",
           info->GopPicSize, info->GopRefDist);
    if (info->GopOptFlag & MFX_GOP_CLOSED)
        av_log(avctx, AV_LOG_VERBOSE, "closed ");
    if (info->GopOptFlag & MFX_GOP_STRICT)
        av_log(avctx, AV_LOG_VERBOSE, "strict ");
    av_log(avctx, AV_LOG_VERBOSE, "; IdrInterval: %"PRIu16"\n", info->IdrInterval);

    av_log(avctx, AV_LOG_VERBOSE, "TargetUsage: %"PRIu16"; RateControlMethod: %s\n",
           info->TargetUsage, print_ratecontrol(info->RateControlMethod));

    if (info->RateControlMethod == MFX_RATECONTROL_CBR ||
        info->RateControlMethod == MFX_RATECONTROL_VBR
#if QSV_HAVE_VCM
        || info->RateControlMethod == MFX_RATECONTROL_VCM
#endif
        ) {
        av_log(avctx, AV_LOG_VERBOSE,
               "InitialDelayInKB: %"PRIu16"; TargetKbps: %"PRIu16"; MaxKbps: %"PRIu16"\n",
               info->InitialDelayInKB, info->TargetKbps, info->MaxKbps);
    } else if (info->RateControlMethod == MFX_RATECONTROL_CQP) {
        av_log(avctx, AV_LOG_VERBOSE, "QPI: %"PRIu16"; QPP: %"PRIu16"; QPB: %"PRIu16"\n",
               info->QPI, info->QPP, info->QPB);
    } else if (info->RateControlMethod == MFX_RATECONTROL_AVBR) {
        av_log(avctx, AV_LOG_VERBOSE,
               "TargetKbps: %"PRIu16"; Accuracy: %"PRIu16"; Convergence: %"PRIu16"\n",
               info->TargetKbps, info->Accuracy, info->Convergence);
    }
#if QSV_HAVE_LA
    else if (info->RateControlMethod == MFX_RATECONTROL_LA
#if QSV_HAVE_LA_HRD
             || info->RateControlMethod == MFX_RATECONTROL_LA_HRD
#endif
             ) {
        av_log(avctx, AV_LOG_VERBOSE,
               "TargetKbps: %"PRIu16"; LookAheadDepth: %"PRIu16"\n",
               info->TargetKbps, co2->LookAheadDepth);
    }
#endif
#if QSV_HAVE_ICQ
    else if (info->RateControlMethod == MFX_RATECONTROL_ICQ) {
        av_log(avctx, AV_LOG_VERBOSE, "ICQQuality: %"PRIu16"\n", info->ICQQuality);
    } else if (info->RateControlMethod == MFX_RATECONTROL_LA_ICQ) {
        av_log(avctx, AV_LOG_VERBOSE, "ICQQuality: %"PRIu16"; LookAheadDepth: %"PRIu16"\n",
               info->ICQQuality, co2->LookAheadDepth);
    }
#endif
#if QSV_HAVE_QVBR
    else if (info->RateControlMethod == MFX_RATECONTROL_QVBR) {
        av_log(avctx, AV_LOG_VERBOSE, "QVBRQuality: %"PRIu16"\n",
               co3->QVBRQuality);
    }
#endif

    av_log(avctx, AV_LOG_VERBOSE, "NumSlice: %"PRIu16"; NumRefFrame: %"PRIu16"\n",
           info->NumSlice, info->NumRefFrame);
    av_log(avctx, AV_LOG_VERBOSE, "RateDistortionOpt: %s\n",
           print_threestate(co->RateDistortionOpt));

#if QSV_HAVE_CO2
    av_log(avctx, AV_LOG_VERBOSE,
           "RecoveryPointSEI: %s IntRefType: %"PRIu16"; IntRefCycleSize: %"PRIu16"; IntRefQPDelta: %"PRId16"\n",
           print_threestate(co->RecoveryPointSEI), co2->IntRefType, co2->IntRefCycleSize, co2->IntRefQPDelta);

    av_log(avctx, AV_LOG_VERBOSE, "MaxFrameSize: %"PRIu16"; ", co2->MaxFrameSize);
#if QSV_VERSION_ATLEAST(1, 9)
    av_log(avctx, AV_LOG_VERBOSE, "MaxSliceSize: %"PRIu16"; ", co2->MaxSliceSize);
#endif
    av_log(avctx, AV_LOG_VERBOSE, "\n");

    av_log(avctx, AV_LOG_VERBOSE,
           "BitrateLimit: %s; MBBRC: %s; ExtBRC: %s\n",
           print_threestate(co2->BitrateLimit), print_threestate(co2->MBBRC),
           print_threestate(co2->ExtBRC));

#if QSV_HAVE_TRELLIS
    av_log(avctx, AV_LOG_VERBOSE, "Trellis: ");
    if (co2->Trellis & MFX_TRELLIS_OFF) {
        av_log(avctx, AV_LOG_VERBOSE, "off");
    } else if (!co2->Trellis) {
        av_log(avctx, AV_LOG_VERBOSE, "auto");
    } else {
        if (co2->Trellis & MFX_TRELLIS_I) av_log(avctx, AV_LOG_VERBOSE, "I");
        if (co2->Trellis & MFX_TRELLIS_P) av_log(avctx, AV_LOG_VERBOSE, "P");
        if (co2->Trellis & MFX_TRELLIS_B) av_log(avctx, AV_LOG_VERBOSE, "B");
    }
    av_log(avctx, AV_LOG_VERBOSE, "\n");
#endif

#if QSV_VERSION_ATLEAST(1, 8)
    av_log(avctx, AV_LOG_VERBOSE,
           "RepeatPPS: %s; NumMbPerSlice: %"PRIu16"; LookAheadDS: ",
           print_threestate(co2->RepeatPPS), co2->NumMbPerSlice);
    switch (co2->LookAheadDS) {
    case MFX_LOOKAHEAD_DS_OFF: av_log(avctx, AV_LOG_VERBOSE, "off");     break;
    case MFX_LOOKAHEAD_DS_2x:  av_log(avctx, AV_LOG_VERBOSE, "2x");      break;
    case MFX_LOOKAHEAD_DS_4x:  av_log(avctx, AV_LOG_VERBOSE, "4x");      break;
    default:                   av_log(avctx, AV_LOG_VERBOSE, "unknown"); break;
    }
    av_log(avctx, AV_LOG_VERBOSE, "\n");

    av_log(avctx, AV_LOG_VERBOSE, "AdaptiveI: %s; AdaptiveB: %s; BRefType: ",
           print_threestate(co2->AdaptiveI), print_threestate(co2->AdaptiveB));
    switch (co2->BRefType) {
    case MFX_B_REF_OFF:     av_log(avctx, AV_LOG_VERBOSE, "off");       break;
    case MFX_B_REF_PYRAMID: av_log(avctx, AV_LOG_VERBOSE, "pyramid");   break;
    default:                av_log(avctx, AV_LOG_VERBOSE, "auto");      break;
    }
    av_log(avctx, AV_LOG_VERBOSE, "\n");
#endif

#if QSV_VERSION_ATLEAST(1, 9)
    av_log(avctx, AV_LOG_VERBOSE,
           "MinQPI: %"PRIu8"; MaxQPI: %"PRIu8"; MinQPP: %"PRIu8"; MaxQPP: %"PRIu8"; MinQPB: %"PRIu8"; MaxQPB: %"PRIu8"\n",
           co2->MinQPI, co2->MaxQPI, co2->MinQPP, co2->MaxQPP, co2->MinQPB, co2->MaxQPB);
#endif
#endif

    if (avctx->codec_id == AV_CODEC_ID_H264) {
        av_log(avctx, AV_LOG_VERBOSE, "Entropy coding: %s; MaxDecFrameBuffering: %"PRIu16"\n",
               co->CAVLC == MFX_CODINGOPTION_ON ? "CAVLC" : "CABAC", co->MaxDecFrameBuffering);
        av_log(avctx, AV_LOG_VERBOSE,
               "NalHrdConformance: %s; SingleSeiNalUnit: %s; VuiVclHrdParameters: %s VuiNalHrdParameters: %s\n",
               print_threestate(co->NalHrdConformance), print_threestate(co->SingleSeiNalUnit),
               print_threestate(co->VuiVclHrdParameters), print_threestate(co->VuiNalHrdParameters));
    }
}

static int init_video_param(AVCodecContext *avctx, QSVEncContext *q)
{
    const char *ratecontrol_desc;

    float quant;
    int ret;

    ret = ff_qsv_codec_id_to_mfx(avctx->codec_id);
    if (ret < 0)
        return AVERROR_BUG;
    q->param.mfx.CodecId = ret;

    q->width_align = avctx->codec_id == AV_CODEC_ID_HEVC ? 32 : 16;

    if (avctx->level > 0)
        q->param.mfx.CodecLevel = avctx->level;

    q->param.mfx.CodecProfile       = q->profile;
    q->param.mfx.TargetUsage        = q->preset;
    q->param.mfx.GopPicSize         = FFMAX(0, avctx->gop_size);
    q->param.mfx.GopRefDist         = FFMAX(-1, avctx->max_b_frames) + 1;
    q->param.mfx.GopOptFlag         = avctx->flags & AV_CODEC_FLAG_CLOSED_GOP ?
                                      MFX_GOP_CLOSED : 0;
    q->param.mfx.IdrInterval        = q->idr_interval;
    q->param.mfx.NumSlice           = avctx->slices;
    q->param.mfx.NumRefFrame        = FFMAX(0, avctx->refs);
    q->param.mfx.EncodedOrder       = 0;
    q->param.mfx.BufferSizeInKB     = 0;

    q->param.mfx.FrameInfo.FourCC         = MFX_FOURCC_NV12;
    q->param.mfx.FrameInfo.Width          = FFALIGN(avctx->width, q->width_align);
    q->param.mfx.FrameInfo.Height         = FFALIGN(avctx->height, 32);
    q->param.mfx.FrameInfo.CropX          = 0;
    q->param.mfx.FrameInfo.CropY          = 0;
    q->param.mfx.FrameInfo.CropW          = avctx->width;
    q->param.mfx.FrameInfo.CropH          = avctx->height;
    q->param.mfx.FrameInfo.AspectRatioW   = avctx->sample_aspect_ratio.num;
    q->param.mfx.FrameInfo.AspectRatioH   = avctx->sample_aspect_ratio.den;
    q->param.mfx.FrameInfo.PicStruct      = MFX_PICSTRUCT_PROGRESSIVE;
    q->param.mfx.FrameInfo.ChromaFormat   = MFX_CHROMAFORMAT_YUV420;
    q->param.mfx.FrameInfo.BitDepthLuma   = 8;
    q->param.mfx.FrameInfo.BitDepthChroma = 8;

    if (avctx->framerate.den > 0 && avctx->framerate.num > 0) {
        q->param.mfx.FrameInfo.FrameRateExtN = avctx->framerate.num;
        q->param.mfx.FrameInfo.FrameRateExtD = avctx->framerate.den;
    } else {
        q->param.mfx.FrameInfo.FrameRateExtN  = avctx->time_base.den;
        q->param.mfx.FrameInfo.FrameRateExtD  = avctx->time_base.num;
    }

    if (avctx->flags & AV_CODEC_FLAG_QSCALE) {
        q->param.mfx.RateControlMethod = MFX_RATECONTROL_CQP;
        ratecontrol_desc = "constant quantization parameter (CQP)";
    } else if (avctx->rc_max_rate == avctx->bit_rate) {
        q->param.mfx.RateControlMethod = MFX_RATECONTROL_CBR;
        ratecontrol_desc = "constant bitrate (CBR)";
    } else if (!avctx->rc_max_rate) {
        q->param.mfx.RateControlMethod = MFX_RATECONTROL_AVBR;
        ratecontrol_desc = "average variable bitrate (AVBR)";
    } else {
        q->param.mfx.RateControlMethod = MFX_RATECONTROL_VBR;
        ratecontrol_desc = "variable bitrate (VBR)";
    }

    av_log(avctx, AV_LOG_VERBOSE, "Using the %s ratecontrol method\n", ratecontrol_desc);

    switch (q->param.mfx.RateControlMethod) {
    case MFX_RATECONTROL_CBR:
    case MFX_RATECONTROL_VBR:
        q->param.mfx.InitialDelayInKB = avctx->rc_initial_buffer_occupancy / 1000;
        q->param.mfx.TargetKbps       = avctx->bit_rate / 1000;
        q->param.mfx.MaxKbps          = avctx->rc_max_rate / 1000;
        break;
    case MFX_RATECONTROL_CQP:
        quant = avctx->global_quality / FF_QP2LAMBDA;

        q->param.mfx.QPI = av_clip(quant * fabs(avctx->i_quant_factor) + avctx->i_quant_offset, 0, 51);
        q->param.mfx.QPP = av_clip(quant, 0, 51);
        q->param.mfx.QPB = av_clip(quant * fabs(avctx->b_quant_factor) + avctx->b_quant_offset, 0, 51);

        break;
    case MFX_RATECONTROL_AVBR:
        q->param.mfx.TargetKbps  = avctx->bit_rate / 1000;
        q->param.mfx.Convergence = q->avbr_convergence;
        q->param.mfx.Accuracy    = q->avbr_accuracy;
        break;
    }

    // the HEVC encoder plugin currently fails if coding options
    // are provided
    if (avctx->codec_id != AV_CODEC_ID_HEVC) {
        q->extco.Header.BufferId      = MFX_EXTBUFF_CODING_OPTION;
        q->extco.Header.BufferSz      = sizeof(q->extco);
        q->extco.CAVLC                = avctx->coder_type == FF_CODER_TYPE_VLC ?
                                        MFX_CODINGOPTION_ON : MFX_CODINGOPTION_UNKNOWN;

        q->extparam_internal[q->nb_extparam_internal++] = (mfxExtBuffer *)&q->extco;
    }

    return 0;
}

static int qsv_retrieve_enc_params(AVCodecContext *avctx, QSVEncContext *q)
{
    uint8_t sps_buf[128];
    uint8_t pps_buf[128];

    mfxExtCodingOptionSPSPPS extradata = {
        .Header.BufferId = MFX_EXTBUFF_CODING_OPTION_SPSPPS,
        .Header.BufferSz = sizeof(extradata),
        .SPSBuffer = sps_buf, .SPSBufSize = sizeof(sps_buf),
        .PPSBuffer = pps_buf, .PPSBufSize = sizeof(pps_buf)
    };

    mfxExtCodingOption co = {
        .Header.BufferId = MFX_EXTBUFF_CODING_OPTION,
        .Header.BufferSz = sizeof(co),
    };
#if QSV_HAVE_CO2
    mfxExtCodingOption2 co2 = {
        .Header.BufferId = MFX_EXTBUFF_CODING_OPTION2,
        .Header.BufferSz = sizeof(co2),
    };
#endif
#if QSV_HAVE_CO3
    mfxExtCodingOption3 co3 = {
        .Header.BufferId = MFX_EXTBUFF_CODING_OPTION3,
        .Header.BufferSz = sizeof(co3),
    };
#endif

    mfxExtBuffer *ext_buffers[] = {
        (mfxExtBuffer*)&extradata,
        (mfxExtBuffer*)&co,
#if QSV_HAVE_CO2
        (mfxExtBuffer*)&co2,
#endif
#if QSV_HAVE_CO3
        (mfxExtBuffer*)&co3,
#endif
    };

    int need_pps = avctx->codec_id != AV_CODEC_ID_MPEG2VIDEO;
    int ret;

    q->param.ExtParam    = ext_buffers;
    q->param.NumExtParam = FF_ARRAY_ELEMS(ext_buffers);

    ret = MFXVideoENCODE_GetVideoParam(q->session, &q->param);
    if (ret < 0)
        return ff_qsv_error(ret);

    q->packet_size = q->param.mfx.BufferSizeInKB * 1000;

    if (!extradata.SPSBufSize || (need_pps && !extradata.PPSBufSize)) {
        av_log(avctx, AV_LOG_ERROR, "No extradata returned from libmfx.\n");
        return AVERROR_UNKNOWN;
    }

    avctx->extradata = av_malloc(extradata.SPSBufSize + need_pps * extradata.PPSBufSize +
                                 AV_INPUT_BUFFER_PADDING_SIZE);
    if (!avctx->extradata)
        return AVERROR(ENOMEM);

    memcpy(avctx->extradata,                        sps_buf, extradata.SPSBufSize);
    if (need_pps)
        memcpy(avctx->extradata + extradata.SPSBufSize, pps_buf, extradata.PPSBufSize);
    avctx->extradata_size = extradata.SPSBufSize + need_pps * extradata.PPSBufSize;
    memset(avctx->extradata + avctx->extradata_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);

    dump_video_param(avctx, q, ext_buffers + 1);

    return 0;
}

static int qsv_init_opaque_alloc(AVCodecContext *avctx, QSVEncContext *q)
{
    AVQSVContext *qsv = avctx->hwaccel_context;
    mfxFrameSurface1 *surfaces;
    int nb_surfaces, i;

    nb_surfaces = qsv->nb_opaque_surfaces + q->req.NumFrameSuggested + q->async_depth;

    q->opaque_alloc_buf = av_buffer_allocz(sizeof(*surfaces) * nb_surfaces);
    if (!q->opaque_alloc_buf)
        return AVERROR(ENOMEM);

    q->opaque_surfaces = av_malloc_array(nb_surfaces, sizeof(*q->opaque_surfaces));
    if (!q->opaque_surfaces)
        return AVERROR(ENOMEM);

    surfaces = (mfxFrameSurface1*)q->opaque_alloc_buf->data;
    for (i = 0; i < nb_surfaces; i++) {
        surfaces[i].Info      = q->req.Info;
        q->opaque_surfaces[i] = surfaces + i;
    }

    q->opaque_alloc.Header.BufferId = MFX_EXTBUFF_OPAQUE_SURFACE_ALLOCATION;
    q->opaque_alloc.Header.BufferSz = sizeof(q->opaque_alloc);
    q->opaque_alloc.In.Surfaces     = q->opaque_surfaces;
    q->opaque_alloc.In.NumSurface   = nb_surfaces;
    q->opaque_alloc.In.Type         = q->req.Type;

    q->extparam_internal[q->nb_extparam_internal++] = (mfxExtBuffer *)&q->opaque_alloc;

    qsv->nb_opaque_surfaces = nb_surfaces;
    qsv->opaque_surfaces    = q->opaque_alloc_buf;
    qsv->opaque_alloc_type  = q->req.Type;

    return 0;
}

int ff_qsv_enc_init(AVCodecContext *avctx, QSVEncContext *q)
{
    int opaque_alloc = 0;
    int ret;

    q->param.IOPattern  = MFX_IOPATTERN_IN_SYSTEM_MEMORY;
    q->param.AsyncDepth = q->async_depth;

    q->async_fifo = av_fifo_alloc((1 + q->async_depth) *
                                  (sizeof(AVPacket) + sizeof(mfxSyncPoint) + sizeof(mfxBitstream*)));
    if (!q->async_fifo)
        return AVERROR(ENOMEM);

    if (avctx->hwaccel_context) {
        AVQSVContext *qsv = avctx->hwaccel_context;

        q->session         = qsv->session;
        q->param.IOPattern = qsv->iopattern;

        opaque_alloc = qsv->opaque_alloc;
    }

    if (!q->session) {
        ret = ff_qsv_init_internal_session(avctx, &q->internal_session,
                                           q->load_plugins);
        if (ret < 0)
            return ret;

        q->session = q->internal_session;
    }

    ret = init_video_param(avctx, q);
    if (ret < 0)
        return ret;

    ret = MFXVideoENCODE_QueryIOSurf(q->session, &q->param, &q->req);
    if (ret < 0) {
        av_log(avctx, AV_LOG_ERROR, "Error querying the encoding parameters\n");
        return ff_qsv_error(ret);
    }

    if (opaque_alloc) {
        ret = qsv_init_opaque_alloc(avctx, q);
        if (ret < 0)
            return ret;
    }

    if (avctx->hwaccel_context) {
        AVQSVContext *qsv = avctx->hwaccel_context;
        int i, j;

        q->extparam = av_mallocz_array(qsv->nb_ext_buffers + q->nb_extparam_internal,
                                       sizeof(*q->extparam));
        if (!q->extparam)
            return AVERROR(ENOMEM);

        q->param.ExtParam = q->extparam;
        for (i = 0; i < qsv->nb_ext_buffers; i++)
            q->param.ExtParam[i] = qsv->ext_buffers[i];
        q->param.NumExtParam = qsv->nb_ext_buffers;

        for (i = 0; i < q->nb_extparam_internal; i++) {
            for (j = 0; j < qsv->nb_ext_buffers; j++) {
                if (qsv->ext_buffers[j]->BufferId == q->extparam_internal[i]->BufferId)
                    break;
            }
            if (j < qsv->nb_ext_buffers)
                continue;

            q->param.ExtParam[q->param.NumExtParam++] = q->extparam_internal[i];
        }
    } else {
        q->param.ExtParam    = q->extparam_internal;
        q->param.NumExtParam = q->nb_extparam_internal;
    }

    ret = MFXVideoENCODE_Init(q->session, &q->param);
    if (ret < 0) {
        av_log(avctx, AV_LOG_ERROR, "Error initializing the encoder\n");
        return ff_qsv_error(ret);
    }

    ret = qsv_retrieve_enc_params(avctx, q);
    if (ret < 0) {
        av_log(avctx, AV_LOG_ERROR, "Error retrieving encoding parameters.\n");
        return ret;
    }

    q->avctx = avctx;

    return 0;
}

static void clear_unused_frames(QSVEncContext *q)
{
    QSVFrame *cur = q->work_frames;
    while (cur) {
        if (cur->surface && !cur->surface->Data.Locked) {
            cur->surface = NULL;
            av_frame_unref(cur->frame);
        }
        cur = cur->next;
    }
}

static int get_free_frame(QSVEncContext *q, QSVFrame **f)
{
    QSVFrame *frame, **last;

    clear_unused_frames(q);

    frame = q->work_frames;
    last  = &q->work_frames;
    while (frame) {
        if (!frame->surface) {
            *f = frame;
            return 0;
        }

        last  = &frame->next;
        frame = frame->next;
    }

    frame = av_mallocz(sizeof(*frame));
    if (!frame)
        return AVERROR(ENOMEM);
    frame->frame = av_frame_alloc();
    if (!frame->frame) {
        av_freep(&frame);
        return AVERROR(ENOMEM);
    }
    *last = frame;

    *f = frame;

    return 0;
}

static int submit_frame(QSVEncContext *q, const AVFrame *frame,
                        mfxFrameSurface1 **surface)
{
    QSVFrame *qf;
    int ret;

    ret = get_free_frame(q, &qf);
    if (ret < 0)
        return ret;

    if (frame->format == AV_PIX_FMT_QSV) {
        ret = av_frame_ref(qf->frame, frame);
        if (ret < 0)
            return ret;

        qf->surface = (mfxFrameSurface1*)qf->frame->data[3];
    } else {
        /* make a copy if the input is not padded as libmfx requires */
        if (frame->height & 31 || frame->linesize[0] & (q->width_align - 1)) {
            qf->frame->height = FFALIGN(frame->height, 32);
            qf->frame->width  = FFALIGN(frame->width, q->width_align);

            ret = ff_get_buffer(q->avctx, qf->frame, AV_GET_BUFFER_FLAG_REF);
            if (ret < 0)
                return ret;

            qf->frame->height = frame->height;
            qf->frame->width  = frame->width;
            ret = av_frame_copy(qf->frame, frame);
            if (ret < 0) {
                av_frame_unref(qf->frame);
                return ret;
            }
        } else {
            ret = av_frame_ref(qf->frame, frame);
            if (ret < 0)
                return ret;
        }

        qf->surface_internal.Info = q->param.mfx.FrameInfo;

        qf->surface_internal.Info.PicStruct =
            !frame->interlaced_frame ? MFX_PICSTRUCT_PROGRESSIVE :
            frame->top_field_first   ? MFX_PICSTRUCT_FIELD_TFF :
                                       MFX_PICSTRUCT_FIELD_BFF;
        if (frame->repeat_pict == 1)
            qf->surface_internal.Info.PicStruct |= MFX_PICSTRUCT_FIELD_REPEATED;
        else if (frame->repeat_pict == 2)
            qf->surface_internal.Info.PicStruct |= MFX_PICSTRUCT_FRAME_DOUBLING;
        else if (frame->repeat_pict == 4)
            qf->surface_internal.Info.PicStruct |= MFX_PICSTRUCT_FRAME_TRIPLING;

        qf->surface_internal.Data.PitchLow  = qf->frame->linesize[0];
        qf->surface_internal.Data.Y         = qf->frame->data[0];
        qf->surface_internal.Data.UV        = qf->frame->data[1];

        qf->surface = &qf->surface_internal;
    }

    qf->surface->Data.TimeStamp = av_rescale_q(frame->pts, q->avctx->time_base, (AVRational){1, 90000});

    *surface = qf->surface;

    return 0;
}

static void print_interlace_msg(AVCodecContext *avctx, QSVEncContext *q)
{
    if (q->param.mfx.CodecId == MFX_CODEC_AVC) {
        if (q->param.mfx.CodecProfile == MFX_PROFILE_AVC_BASELINE ||
            q->param.mfx.CodecLevel < MFX_LEVEL_AVC_21 ||
            q->param.mfx.CodecLevel > MFX_LEVEL_AVC_41)
            av_log(avctx, AV_LOG_WARNING,
                   "Interlaced coding is supported"
                   " at Main/High Profile Level 2.1-4.1\n");
    }
}

int ff_qsv_encode(AVCodecContext *avctx, QSVEncContext *q,
                  AVPacket *pkt, const AVFrame *frame, int *got_packet)
{
    AVPacket new_pkt = { 0 };
    mfxBitstream *bs;

    mfxFrameSurface1 *surf = NULL;
    mfxSyncPoint sync      = NULL;
    int ret;

    if (frame) {
        ret = submit_frame(q, frame, &surf);
        if (ret < 0) {
            av_log(avctx, AV_LOG_ERROR, "Error submitting the frame for encoding.\n");
            return ret;
        }
    }

    ret = av_new_packet(&new_pkt, q->packet_size);
    if (ret < 0) {
        av_log(avctx, AV_LOG_ERROR, "Error allocating the output packet\n");
        return ret;
    }

    bs = av_mallocz(sizeof(*bs));
    if (!bs) {
        av_packet_unref(&new_pkt);
        return AVERROR(ENOMEM);
    }
    bs->Data      = new_pkt.data;
    bs->MaxLength = new_pkt.size;

    do {
        ret = MFXVideoENCODE_EncodeFrameAsync(q->session, NULL, surf, bs, &sync);
        if (ret == MFX_WRN_DEVICE_BUSY)
            av_usleep(1);
    } while (ret > 0);

    if (ret < 0) {
        av_packet_unref(&new_pkt);
        av_freep(&bs);
        return (ret == MFX_ERR_MORE_DATA) ? 0 : ff_qsv_error(ret);
    }

    if (ret == MFX_WRN_INCOMPATIBLE_VIDEO_PARAM && frame->interlaced_frame)
        print_interlace_msg(avctx, q);

    if (sync) {
        av_fifo_generic_write(q->async_fifo, &new_pkt, sizeof(new_pkt), NULL);
        av_fifo_generic_write(q->async_fifo, &sync,    sizeof(sync),    NULL);
        av_fifo_generic_write(q->async_fifo, &bs,      sizeof(bs),    NULL);
    } else {
        av_packet_unref(&new_pkt);
        av_freep(&bs);
    }

    if (!av_fifo_space(q->async_fifo) ||
        (!frame && av_fifo_size(q->async_fifo))) {
        av_fifo_generic_read(q->async_fifo, &new_pkt, sizeof(new_pkt), NULL);
        av_fifo_generic_read(q->async_fifo, &sync,    sizeof(sync),    NULL);
        av_fifo_generic_read(q->async_fifo, &bs,      sizeof(bs),      NULL);

        MFXVideoCORE_SyncOperation(q->session, sync, 60000);

        new_pkt.dts  = av_rescale_q(bs->DecodeTimeStamp, (AVRational){1, 90000}, avctx->time_base);
        new_pkt.pts  = av_rescale_q(bs->TimeStamp,       (AVRational){1, 90000}, avctx->time_base);
        new_pkt.size = bs->DataLength;

        if (bs->FrameType & MFX_FRAMETYPE_IDR ||
            bs->FrameType & MFX_FRAMETYPE_xIDR)
            new_pkt.flags |= AV_PKT_FLAG_KEY;

#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
        if (bs->FrameType & MFX_FRAMETYPE_I || bs->FrameType & MFX_FRAMETYPE_xI)
            avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
        else if (bs->FrameType & MFX_FRAMETYPE_P || bs->FrameType & MFX_FRAMETYPE_xP)
            avctx->coded_frame->pict_type = AV_PICTURE_TYPE_P;
        else if (bs->FrameType & MFX_FRAMETYPE_B || bs->FrameType & MFX_FRAMETYPE_xB)
            avctx->coded_frame->pict_type = AV_PICTURE_TYPE_B;
FF_ENABLE_DEPRECATION_WARNINGS
#endif

        av_freep(&bs);

        if (pkt->data) {
            if (pkt->size < new_pkt.size) {
                av_log(avctx, AV_LOG_ERROR, "Submitted buffer not large enough: %d < %d\n",
                       pkt->size, new_pkt.size);
                av_packet_unref(&new_pkt);
                return AVERROR(EINVAL);
            }

            memcpy(pkt->data, new_pkt.data, new_pkt.size);
            pkt->size = new_pkt.size;

            ret = av_packet_copy_props(pkt, &new_pkt);
            av_packet_unref(&new_pkt);
            if (ret < 0)
                return ret;
        } else
            *pkt = new_pkt;

        *got_packet = 1;
    }

    return 0;
}

int ff_qsv_enc_close(AVCodecContext *avctx, QSVEncContext *q)
{
    QSVFrame *cur;

    if (q->session)
        MFXVideoENCODE_Close(q->session);
    if (q->internal_session)
        MFXClose(q->internal_session);
    q->session          = NULL;
    q->internal_session = NULL;

    cur = q->work_frames;
    while (cur) {
        q->work_frames = cur->next;
        av_frame_free(&cur->frame);
        av_freep(&cur);
        cur = q->work_frames;
    }

    while (q->async_fifo && av_fifo_size(q->async_fifo)) {
        AVPacket pkt;
        mfxSyncPoint sync;
        mfxBitstream *bs;

        av_fifo_generic_read(q->async_fifo, &pkt,  sizeof(pkt),  NULL);
        av_fifo_generic_read(q->async_fifo, &sync, sizeof(sync), NULL);
        av_fifo_generic_read(q->async_fifo, &bs,   sizeof(bs),   NULL);

        av_freep(&bs);
        av_packet_unref(&pkt);
    }
    av_fifo_free(q->async_fifo);
    q->async_fifo = NULL;

    av_freep(&q->opaque_surfaces);
    av_buffer_unref(&q->opaque_alloc_buf);

    av_freep(&q->extparam);

    return 0;
}