PeerStreamer

/*

 * DXVA2 WMV3/VC-1 HW acceleration.

 *

 * copyright (c) 2010 Laurent Aimar

 *

 * 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 "dxva2_internal.h"

#include "vc1.h"

#include "vc1data.h"

struct dxva2_picture_context {

    DXVA_PictureParameters pp;

    DXVA_SliceInfo         si;

    const uint8_t          *bitstream;

    unsigned               bitstream_size;

};

static void fill_picture_parameters(AVCodecContext *avctx,

                                    struct dxva_context *ctx, const VC1Context *v,

                                    DXVA_PictureParameters *pp)

{

    const MpegEncContext *s = &v->s;

    const Picture *current_picture = s->current_picture_ptr;

    memset(pp, 0, sizeof(*pp));

    pp->wDecodedPictureIndex    =

    pp->wDeblockedPictureIndex  = ff_dxva2_get_surface_index(ctx, current_picture);

    if (s->pict_type != FF_I_TYPE)

        pp->wForwardRefPictureIndex = ff_dxva2_get_surface_index(ctx, &s->last_picture);

    else

        pp->wForwardRefPictureIndex = 0xffff;

    if (s->pict_type == FF_B_TYPE)

        pp->wBackwardRefPictureIndex = ff_dxva2_get_surface_index(ctx, &s->next_picture);

    else

        pp->wBackwardRefPictureIndex = 0xffff;

    if (v->profile == PROFILE_ADVANCED) {

        /* It is the cropped width/height -1 of the frame */

        pp->wPicWidthInMBminus1 = avctx->width  - 1;

        pp->wPicHeightInMBminus1= avctx->height - 1;

    } else {

        /* It is the coded width/height in macroblock -1 of the frame */

        pp->wPicWidthInMBminus1 = s->mb_width  - 1;

        pp->wPicHeightInMBminus1= s->mb_height - 1;

    }

    pp->bMacroblockWidthMinus1  = 15;

    pp->bMacroblockHeightMinus1 = 15;

    pp->bBlockWidthMinus1       = 7;

    pp->bBlockHeightMinus1      = 7;

    pp->bBPPminus1              = 7;

    if (s->picture_structure & PICT_TOP_FIELD)

        pp->bPicStructure      |= 0x01;

    if (s->picture_structure & PICT_BOTTOM_FIELD)

        pp->bPicStructure      |= 0x02;

    pp->bSecondField            = v->interlace && v->fcm != 0x03 && !s->first_field;

    pp->bPicIntra               = s->pict_type == FF_I_TYPE;

    pp->bPicBackwardPrediction  = s->pict_type == FF_B_TYPE;

    pp->bBidirectionalAveragingMode = (1                                           << 7) |

                                      ((ctx->cfg->ConfigIntraResidUnsigned != 0)   << 6) |

                                      ((ctx->cfg->ConfigResidDiffAccelerator != 0) << 5) |

                                      ((v->lumscale != 32 || v->lumshift != 0)     << 4) |

                                      ((v->profile == PROFILE_ADVANCED)            << 3);

    pp->bMVprecisionAndChromaRelation = ((v->mv_mode == MV_PMODE_1MV_HPEL_BILIN) << 3) |

                                        (1                                       << 2) |

                                        (0                                       << 1) |

                                        (!s->quarter_sample                          );

    pp->bChromaFormat           = v->chromaformat;

    ctx->report_id++;

    if (ctx->report_id >= (1 << 16))

        ctx->report_id = 1;

    pp->bPicScanFixed           = ctx->report_id >> 8;

    pp->bPicScanMethod          = ctx->report_id & 0xff;

    pp->bPicReadbackRequests    = 0;

    pp->bRcontrol               = v->rnd;

    pp->bPicSpatialResid8       = (v->panscanflag  << 7) |

                                  (v->refdist_flag << 6) |

                                  (s->loop_filter  << 5) |

                                  (v->fastuvmc     << 4) |

                                  (v->extended_mv  << 3) |

                                  (v->dquant       << 1) |

                                  (v->vstransform      );

    pp->bPicOverflowBlocks      = (v->quantizer_mode << 6) |

                                  (v->multires       << 5) |

                                  (s->resync_marker  << 4) |

                                  (v->rangered       << 3) |

                                  (s->max_b_frames       );

    pp->bPicExtrapolation       = (!v->interlace || v->fcm == 0x00) ? 1 : 2;

    pp->bPicDeblocked           = ((v->profile != PROFILE_ADVANCED && v->rangeredfrm) << 5) |

                                  (s->loop_filter                                     << 1);

    pp->bPicDeblockConfined     = (v->postprocflag             << 7) |

                                  (v->broadcast                << 6) |

                                  (v->interlace                << 5) |

                                  (v->tfcntrflag               << 4) |

                                  (v->finterpflag              << 3) |

                                  ((s->pict_type != FF_B_TYPE) << 2) |

                                  (v->psf                      << 1) |

                                  (v->extended_dmv                 );

    if (s->pict_type != FF_I_TYPE)

        pp->bPic4MVallowed      = v->mv_mode == MV_PMODE_MIXED_MV ||

                                  (v->mv_mode == MV_PMODE_INTENSITY_COMP &&

                                   v->mv_mode2 == MV_PMODE_MIXED_MV);

    if (v->profile == PROFILE_ADVANCED)

        pp->bPicOBMC            = (v->range_mapy_flag  << 7) |

                                  (v->range_mapy       << 4) |

                                  (v->range_mapuv_flag << 3) |

                                  (v->range_mapuv          );

    pp->bPicBinPB               = 0;

    pp->bMV_RPS                 = 0;

    pp->bReservedBits           = 0;

    if (s->picture_structure == PICT_FRAME) {

        pp->wBitstreamFcodes        = v->lumscale;

        pp->wBitstreamPCEelements   = v->lumshift;

    } else {

        /* Syntax: (top_field_param << 8) | bottom_field_param */

        pp->wBitstreamFcodes        = (v->lumscale << 8) | v->lumscale;

        pp->wBitstreamPCEelements   = (v->lumshift << 8) | v->lumshift;

    }

    pp->bBitstreamConcealmentNeed   = 0;

    pp->bBitstreamConcealmentMethod = 0;

}

static void fill_slice(AVCodecContext *avctx, DXVA_SliceInfo *slice,

                       unsigned position, unsigned size)

{

    const VC1Context *v = avctx->priv_data;

    const MpegEncContext *s = &v->s;

    memset(slice, 0, sizeof(*slice));

    slice->wHorizontalPosition = 0;

    slice->wVerticalPosition   = s->mb_y;

    slice->dwSliceBitsInBuffer = 8 * size;

    slice->dwSliceDataLocation = position;

    slice->bStartCodeBitOffset = 0;

    slice->bReservedBits       = 0;

    slice->wMBbitOffset        = get_bits_count(&s->gb);

    slice->wNumberMBsInSlice   = s->mb_width * s->mb_height; /* XXX We assume 1 slice */

    slice->wQuantizerScaleCode = v->pq;

    slice->wBadSliceChopping   = 0;

}

static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,

                                             DXVA2_DecodeBufferDesc *bs,

                                             DXVA2_DecodeBufferDesc *sc)

{

    const VC1Context *v = avctx->priv_data;

    struct dxva_context *ctx = avctx->hwaccel_context;

    const MpegEncContext *s = &v->s;

    struct dxva2_picture_context *ctx_pic = s->current_picture_ptr->hwaccel_picture_private;

    DXVA_SliceInfo *slice = &ctx_pic->si;

    static const uint8_t start_code[] = { 0, 0, 1, 0x0d };

    const unsigned start_code_size = avctx->codec_id == CODEC_ID_VC1 ? sizeof(start_code) : 0;

    const unsigned slice_size = slice->dwSliceBitsInBuffer / 8;

    const unsigned padding = 128 - ((start_code_size + slice_size) & 127);

    const unsigned data_size = start_code_size + slice_size + padding;

    uint8_t  *dxva_data;

    unsigned dxva_size;

    int result;

    if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,

                                              DXVA2_BitStreamDateBufferType,

                                              &dxva_data, &dxva_size)))

        return -1;

    result = data_size <= dxva_size ? 0 : -1;

    if (!result) {

        if (start_code_size > 0)

            memcpy(dxva_data, start_code, start_code_size);

        memcpy(dxva_data + start_code_size,

               ctx_pic->bitstream + slice->dwSliceDataLocation, slice_size);

        if (padding > 0)

            memset(dxva_data + start_code_size + slice_size, 0, padding);

        slice->dwSliceBitsInBuffer = 8 * data_size;

    }

    if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,

                                                  DXVA2_BitStreamDateBufferType)))

        return -1;

    if (result)

        return result;

    memset(bs, 0, sizeof(*bs));

    bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;

    bs->DataSize             = data_size;

    bs->NumMBsInBuffer       = s->mb_width * s->mb_height;

    assert((bs->DataSize & 127) == 0);

    return ff_dxva2_commit_buffer(avctx, ctx, sc,

                                  DXVA2_SliceControlBufferType,

                                  slice, sizeof(*slice), bs->NumMBsInBuffer);

}

static int start_frame(AVCodecContext *avctx,

                       av_unused const uint8_t *buffer,

                       av_unused uint32_t size)

{

    const VC1Context *v = avctx->priv_data;

    struct dxva_context *ctx = avctx->hwaccel_context;

    struct dxva2_picture_context *ctx_pic = v->s.current_picture_ptr->hwaccel_picture_private;

    if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)

        return -1;

    assert(ctx_pic);

    fill_picture_parameters(avctx, ctx, v, &ctx_pic->pp);

    ctx_pic->bitstream_size = 0;

    ctx_pic->bitstream      = NULL;

    return 0;

}

static int decode_slice(AVCodecContext *avctx,

                        const uint8_t *buffer, uint32_t size)

{

    const VC1Context *v = avctx->priv_data;

    const Picture *current_picture = v->s.current_picture_ptr;

    struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;

    if (ctx_pic->bitstream_size > 0)

        return -1;

    if (avctx->codec_id == CODEC_ID_VC1 &&

        size >= 4 && IS_MARKER(AV_RB32(buffer))) {

        buffer += 4;

        size   -= 4;

    }

    ctx_pic->bitstream_size = size;

    ctx_pic->bitstream      = buffer;

    fill_slice(avctx, &ctx_pic->si, 0, size);

    return 0;

}

static int end_frame(AVCodecContext *avctx)

{

    VC1Context *v = avctx->priv_data;

    struct dxva2_picture_context *ctx_pic = v->s.current_picture_ptr->hwaccel_picture_private;

    if (ctx_pic->bitstream_size <= 0)

        return -1;

    return ff_dxva2_common_end_frame(avctx, &v->s,

                                     &ctx_pic->pp, sizeof(ctx_pic->pp),

                                     NULL, 0,

                                     commit_bitstream_and_slice_buffer);

}

#if CONFIG_WMV3_DXVA2_HWACCEL

AVHWAccel ff_wmv3_dxva2_hwaccel = {

    .name           = "wmv3_dxva2",

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = CODEC_ID_WMV3,

    .pix_fmt        = PIX_FMT_DXVA2_VLD,

    .capabilities   = 0,

    .start_frame    = start_frame,

    .decode_slice   = decode_slice,

    .end_frame      = end_frame,

    .priv_data_size = sizeof(struct dxva2_picture_context),

};

#endif

AVHWAccel ff_vc1_dxva2_hwaccel = {

    .name           = "vc1_dxva2",

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = CODEC_ID_VC1,

    .pix_fmt        = PIX_FMT_DXVA2_VLD,

    .capabilities   = 0,

    .start_frame    = start_frame,

    .decode_slice   = decode_slice,

    .end_frame      = end_frame,

    .priv_data_size = sizeof(struct dxva2_picture_context),

};