/*
 * VC-1 HW decode acceleration through VA API
 *
 * Copyright (C) 2008-2009 Splitted-Desktop Systems
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "hwaccel.h"
#include "internal.h"
#include "vaapi_decode.h"
#include "vc1.h"
#include "vc1data.h"

/** Translate FFmpeg MV modes to VA API */
static int get_VAMvModeVC1(enum MVModes mv_mode)
{
    switch (mv_mode) {
    case MV_PMODE_1MV_HPEL_BILIN: return VAMvMode1MvHalfPelBilinear;
    case MV_PMODE_1MV:            return VAMvMode1Mv;
    case MV_PMODE_1MV_HPEL:       return VAMvMode1MvHalfPel;
    case MV_PMODE_MIXED_MV:       return VAMvModeMixedMv;
    case MV_PMODE_INTENSITY_COMP: return VAMvModeIntensityCompensation;
    }
    return 0;
}

/** Check whether the MVTYPEMB bitplane is present */
static inline int vc1_has_MVTYPEMB_bitplane(const VC1Context *v)
{
    if (v->mv_type_is_raw)
        return 0;
    return v->s.pict_type == AV_PICTURE_TYPE_P &&
           (v->mv_mode == MV_PMODE_MIXED_MV ||
            (v->mv_mode == MV_PMODE_INTENSITY_COMP &&
             v->mv_mode2 == MV_PMODE_MIXED_MV));
}

/** Check whether the SKIPMB bitplane is present */
static inline int vc1_has_SKIPMB_bitplane(const VC1Context *v)
{
    if (v->skip_is_raw)
        return 0;
    return v->s.pict_type == AV_PICTURE_TYPE_P ||
           (v->s.pict_type == AV_PICTURE_TYPE_B && !v->bi_type);
}

/** Check whether the DIRECTMB bitplane is present */
static inline int vc1_has_DIRECTMB_bitplane(const VC1Context *v)
{
    if (v->dmb_is_raw)
        return 0;
    return v->s.pict_type == AV_PICTURE_TYPE_B && !v->bi_type;
}

/** Check whether the ACPRED bitplane is present */
static inline int vc1_has_ACPRED_bitplane(const VC1Context *v)
{
    if (v->acpred_is_raw)
        return 0;
    return v->profile == PROFILE_ADVANCED &&
           (v->s.pict_type == AV_PICTURE_TYPE_I ||
            (v->s.pict_type == AV_PICTURE_TYPE_B && v->bi_type));
}

/** Check whether the OVERFLAGS bitplane is present */
static inline int vc1_has_OVERFLAGS_bitplane(const VC1Context *v)
{
    if (v->overflg_is_raw)
        return 0;
    return v->profile == PROFILE_ADVANCED &&
           (v->s.pict_type == AV_PICTURE_TYPE_I ||
            (v->s.pict_type == AV_PICTURE_TYPE_B && v->bi_type)) &&
           (v->overlap && v->pq <= 8) &&
           v->condover == CONDOVER_SELECT;
}

/** Reconstruct bitstream PTYPE (7.1.1.4, index into Table-35) */
static int vc1_get_PTYPE(const VC1Context *v)
{
    const MpegEncContext *s = &v->s;
    switch (s->pict_type) {
    case AV_PICTURE_TYPE_I: return 0;
    case AV_PICTURE_TYPE_P: return v->p_frame_skipped ? 4 : 1;
    case AV_PICTURE_TYPE_B: return v->bi_type         ? 3 : 2;
    }
    return 0;
}

/** Reconstruct bitstream MVMODE (7.1.1.32) */
static inline VAMvModeVC1 vc1_get_MVMODE(const VC1Context *v)
{
    if (v->s.pict_type == AV_PICTURE_TYPE_P ||
        (v->s.pict_type == AV_PICTURE_TYPE_B && !v->bi_type))
        return get_VAMvModeVC1(v->mv_mode);
    return 0;
}

/** Reconstruct bitstream MVMODE2 (7.1.1.33) */
static inline VAMvModeVC1 vc1_get_MVMODE2(const VC1Context *v)
{
    if (v->s.pict_type == AV_PICTURE_TYPE_P && v->mv_mode == MV_PMODE_INTENSITY_COMP)
        return get_VAMvModeVC1(v->mv_mode2);
    return 0;
}

/** Reconstruct bitstream TTFRM (7.1.1.41, Table-53) */
static inline int vc1_get_TTFRM(const VC1Context *v)
{
    switch (v->ttfrm) {
    case TT_8X8: return 0;
    case TT_8X4: return 1;
    case TT_4X8: return 2;
    case TT_4X4: return 3;
    }
    return 0;
}

/** Pack FFmpeg bitplanes into a VABitPlaneBuffer element */
static inline void vc1_pack_bitplanes(uint8_t *bitplane, int n, const uint8_t *ff_bp[3], int x, int y, int stride)
{
    const int bitplane_index = n / 2;
    const int ff_bp_index = y * stride + x;
    uint8_t v = 0;
    if (ff_bp[0])
        v = ff_bp[0][ff_bp_index];
    if (ff_bp[1])
        v |= ff_bp[1][ff_bp_index] << 1;
    if (ff_bp[2])
        v |= ff_bp[2][ff_bp_index] << 2;
    bitplane[bitplane_index] = (bitplane[bitplane_index] << 4) | v;
}

static int vaapi_vc1_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
{
    const VC1Context *v = avctx->priv_data;
    const MpegEncContext *s = &v->s;
    VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
    VAPictureParameterBufferVC1 pic_param;
    int err;

    pic->output_surface = ff_vaapi_get_surface_id(s->current_picture_ptr->f);

    pic_param = (VAPictureParameterBufferVC1) {
        .forward_reference_picture         = VA_INVALID_ID,
        .backward_reference_picture        = VA_INVALID_ID,
        .inloop_decoded_picture            = VA_INVALID_ID,
        .sequence_fields.bits = {
            .pulldown                      = v->broadcast,
            .interlace                     = v->interlace,
            .tfcntrflag                    = v->tfcntrflag,
            .finterpflag                   = v->finterpflag,
            .psf                           = v->psf,
            .multires                      = v->multires,
            .overlap                       = v->overlap,
            .syncmarker                    = v->resync_marker,
            .rangered                      = v->rangered,
            .max_b_frames                  = s->avctx->max_b_frames,
            .profile                       = v->profile,
        },
        .coded_width                       = s->avctx->coded_width,
        .coded_height                      = s->avctx->coded_height,
        .entrypoint_fields.bits = {
            .broken_link                   = v->broken_link,
            .closed_entry                  = v->closed_entry,
            .panscan_flag                  = v->panscanflag,
            .loopfilter                    = s->loop_filter,
        },
        .conditional_overlap_flag          = v->condover,
        .fast_uvmc_flag                    = v->fastuvmc,
        .range_mapping_fields.bits = {
            .luma_flag                     = v->range_mapy_flag,
            .luma                          = v->range_mapy,
            .chroma_flag                   = v->range_mapuv_flag,
            .chroma                        = v->range_mapuv,
        },
        .b_picture_fraction                = v->bfraction_lut_index,
        .cbp_table                         = v->cbpcy_vlc ? v->cbpcy_vlc - ff_vc1_cbpcy_p_vlc : 0,
        .mb_mode_table                     = 0, /* XXX: interlaced frame */
        .range_reduction_frame             = v->rangeredfrm,
        .rounding_control                  = v->rnd,
        .post_processing                   = v->postproc,
        .picture_resolution_index          = v->respic,
        .luma_scale                        = v->lumscale,
        .luma_shift                        = v->lumshift,
        .picture_fields.bits = {
            .picture_type                  = vc1_get_PTYPE(v),
            .frame_coding_mode             = v->fcm,
            .top_field_first               = v->tff,
            .is_first_field                = v->fcm == 0, /* XXX: interlaced frame */
            .intensity_compensation        = v->mv_mode == MV_PMODE_INTENSITY_COMP,
        },
        .raw_coding.flags = {
            .mv_type_mb                    = v->mv_type_is_raw,
            .direct_mb                     = v->dmb_is_raw,
            .skip_mb                       = v->skip_is_raw,
            .field_tx                      = 0, /* XXX: interlaced frame */
            .forward_mb                    = 0, /* XXX: interlaced frame */
            .ac_pred                       = v->acpred_is_raw,
            .overflags                     = v->overflg_is_raw,
        },
        .bitplane_present.flags = {
            .bp_mv_type_mb                 = vc1_has_MVTYPEMB_bitplane(v),
            .bp_direct_mb                  = vc1_has_DIRECTMB_bitplane(v),
            .bp_skip_mb                    = vc1_has_SKIPMB_bitplane(v),
            .bp_field_tx                   = 0, /* XXX: interlaced frame */
            .bp_forward_mb                 = 0, /* XXX: interlaced frame */
            .bp_ac_pred                    = vc1_has_ACPRED_bitplane(v),
            .bp_overflags                  = vc1_has_OVERFLAGS_bitplane(v),
        },
        .reference_fields.bits = {
            .reference_distance_flag       = v->refdist_flag,
            .reference_distance            = 0, /* XXX: interlaced frame */
            .num_reference_pictures        = 0, /* XXX: interlaced frame */
            .reference_field_pic_indicator = 0, /* XXX: interlaced frame */
        },
        .mv_fields.bits = {
            .mv_mode                       = vc1_get_MVMODE(v),
            .mv_mode2                      = vc1_get_MVMODE2(v),
            .mv_table                      = s->mv_table_index,
            .two_mv_block_pattern_table    = 0, /* XXX: interlaced frame */
            .four_mv_switch                = 0, /* XXX: interlaced frame */
            .four_mv_block_pattern_table   = 0, /* XXX: interlaced frame */
            .extended_mv_flag              = v->extended_mv,
            .extended_mv_range             = v->mvrange,
            .extended_dmv_flag             = v->extended_dmv,
            .extended_dmv_range            = 0, /* XXX: interlaced frame */
        },
        .pic_quantizer_fields.bits = {
            .dquant                        = v->dquant,
            .quantizer                     = v->quantizer_mode,
            .half_qp                       = v->halfpq,
            .pic_quantizer_scale           = v->pq,
            .pic_quantizer_type            = v->pquantizer,
            .dq_frame                      = v->dquantfrm,
            .dq_profile                    = v->dqprofile,
            .dq_sb_edge                    = v->dqprofile == DQPROFILE_SINGLE_EDGE  ? v->dqsbedge : 0,
            .dq_db_edge                    = v->dqprofile == DQPROFILE_DOUBLE_EDGES ? v->dqsbedge : 0,
            .dq_binary_level               = v->dqbilevel,
            .alt_pic_quantizer             = v->altpq,
        },
        .transform_fields.bits = {
            .variable_sized_transform_flag = v->vstransform,
            .mb_level_transform_type_flag  = v->ttmbf,
            .frame_level_transform_type    = vc1_get_TTFRM(v),
            .transform_ac_codingset_idx1   = v->c_ac_table_index,
            .transform_ac_codingset_idx2   = v->y_ac_table_index,
            .intra_transform_dc_table      = v->s.dc_table_index,
        },
    };

    switch (s->pict_type) {
    case AV_PICTURE_TYPE_B:
        pic_param.backward_reference_picture = ff_vaapi_get_surface_id(s->next_picture.f);
        // fall-through
    case AV_PICTURE_TYPE_P:
        pic_param.forward_reference_picture = ff_vaapi_get_surface_id(s->last_picture.f);
        break;
    }

    err = ff_vaapi_decode_make_param_buffer(avctx, pic,
                                            VAPictureParameterBufferType,
                                            &pic_param, sizeof(pic_param));
    if (err)
        goto fail;

    if (pic_param.bitplane_present.value) {
        uint8_t *bitplane;
        const uint8_t *ff_bp[3];
        int x, y, n;
        size_t size = (s->mb_width * s->mb_height + 1) / 2;

        bitplane = av_mallocz(size);
        if (!bitplane) {
            err = AVERROR(ENOMEM);
            goto fail;
        }

        switch (s->pict_type) {
        case AV_PICTURE_TYPE_P:
            ff_bp[0] = pic_param.bitplane_present.flags.bp_direct_mb  ? v->direct_mb_plane    : NULL;
            ff_bp[1] = pic_param.bitplane_present.flags.bp_skip_mb    ? s->mbskip_table       : NULL;
            ff_bp[2] = pic_param.bitplane_present.flags.bp_mv_type_mb ? v->mv_type_mb_plane   : NULL;
            break;
        case AV_PICTURE_TYPE_B:
            if (!v->bi_type) {
                ff_bp[0] = pic_param.bitplane_present.flags.bp_direct_mb ? v->direct_mb_plane : NULL;
                ff_bp[1] = pic_param.bitplane_present.flags.bp_skip_mb   ? s->mbskip_table    : NULL;
                ff_bp[2] = NULL; /* XXX: interlaced frame (FORWARD plane) */
                break;
            }
            /* fall-through (BI-type) */
        case AV_PICTURE_TYPE_I:
            ff_bp[0] = NULL; /* XXX: interlaced frame (FIELDTX plane) */
            ff_bp[1] = pic_param.bitplane_present.flags.bp_ac_pred    ? v->acpred_plane       : NULL;
            ff_bp[2] = pic_param.bitplane_present.flags.bp_overflags  ? v->over_flags_plane   : NULL;
            break;
        default:
            ff_bp[0] = NULL;
            ff_bp[1] = NULL;
            ff_bp[2] = NULL;
            break;
        }

        n = 0;
        for (y = 0; y < s->mb_height; y++)
            for (x = 0; x < s->mb_width; x++, n++)
                vc1_pack_bitplanes(bitplane, n, ff_bp, x, y, s->mb_stride);
        if (n & 1) /* move last nibble to the high order */
            bitplane[n/2] <<= 4;

        err = ff_vaapi_decode_make_param_buffer(avctx, pic,
                                                VABitPlaneBufferType,
                                                bitplane, size);
        av_free(bitplane);
        if (err)
            goto fail;
    }
    return 0;

fail:
    ff_vaapi_decode_cancel(avctx, pic);
    return err;
}

static int vaapi_vc1_end_frame(AVCodecContext *avctx)
{
    VC1Context *v = avctx->priv_data;
    MpegEncContext *s = &v->s;
    VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
    int ret;

    ret = ff_vaapi_decode_issue(avctx, pic);
    if (ret < 0)
        goto fail;

    ff_mpeg_draw_horiz_band(s, 0, s->avctx->height);

fail:
    return ret;
}

static int vaapi_vc1_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
{
    const VC1Context *v = avctx->priv_data;
    const MpegEncContext *s = &v->s;
    VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
    VASliceParameterBufferVC1 slice_param;
    int err;

    /* Current bit buffer is beyond any marker for VC-1, so skip it */
    if (avctx->codec_id == AV_CODEC_ID_VC1 && IS_MARKER(AV_RB32(buffer))) {
        buffer += 4;
        size -= 4;
    }

    slice_param = (VASliceParameterBufferVC1) {
        .slice_data_size         = size,
        .slice_data_offset       = 0,
        .slice_data_flag         = VA_SLICE_DATA_FLAG_ALL,
        .macroblock_offset       = get_bits_count(&s->gb),
        .slice_vertical_position = s->mb_y,
    };

    err = ff_vaapi_decode_make_slice_buffer(avctx, pic,
                                            &slice_param, sizeof(slice_param),
                                            buffer, size);
    if (err < 0) {
        ff_vaapi_decode_cancel(avctx, pic);
        return err;
    }

    return 0;
}

#if CONFIG_WMV3_VAAPI_HWACCEL
const AVHWAccel ff_wmv3_vaapi_hwaccel = {
    .name                 = "wmv3_vaapi",
    .type                 = AVMEDIA_TYPE_VIDEO,
    .id                   = AV_CODEC_ID_WMV3,
    .pix_fmt              = AV_PIX_FMT_VAAPI,
    .start_frame          = &vaapi_vc1_start_frame,
    .end_frame            = &vaapi_vc1_end_frame,
    .decode_slice         = &vaapi_vc1_decode_slice,
    .frame_priv_data_size = sizeof(VAAPIDecodePicture),
    .init                 = &ff_vaapi_decode_init,
    .uninit               = &ff_vaapi_decode_uninit,
    .frame_params         = &ff_vaapi_common_frame_params,
    .priv_data_size       = sizeof(VAAPIDecodeContext),
    .caps_internal        = HWACCEL_CAP_ASYNC_SAFE,
};
#endif

const AVHWAccel ff_vc1_vaapi_hwaccel = {
    .name                 = "vc1_vaapi",
    .type                 = AVMEDIA_TYPE_VIDEO,
    .id                   = AV_CODEC_ID_VC1,
    .pix_fmt              = AV_PIX_FMT_VAAPI,
    .start_frame          = &vaapi_vc1_start_frame,
    .end_frame            = &vaapi_vc1_end_frame,
    .decode_slice         = &vaapi_vc1_decode_slice,
    .frame_priv_data_size = sizeof(VAAPIDecodePicture),
    .init                 = &ff_vaapi_decode_init,
    .uninit               = &ff_vaapi_decode_uninit,
    .frame_params         = &ff_vaapi_common_frame_params,
    .priv_data_size       = sizeof(VAAPIDecodeContext),
    .caps_internal        = HWACCEL_CAP_ASYNC_SAFE,
};