PeerStreamer

/*

 * MPEG-4 / H.263 HW decode acceleration through VA API

 *

 * Copyright (C) 2008-2009 Splitted-Desktop Systems

 *

 * 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 "vaapi_internal.h"

#include "h263.h"

/** Reconstruct bitstream intra_dc_vlc_thr */

static int mpeg4_get_intra_dc_vlc_thr(MpegEncContext *s)

{

    switch (s->intra_dc_threshold) {

    case 99: return 0;

    case 13: return 1;

    case 15: return 2;

    case 17: return 3;

    case 19: return 4;

    case 21: return 5;

    case 23: return 6;

    case 0:  return 7;

    }

    return 0;

}

static int vaapi_mpeg4_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)

{

    MpegEncContext * const s = avctx->priv_data;

    struct vaapi_context * const vactx = avctx->hwaccel_context;

    VAPictureParameterBufferMPEG4 *pic_param;

    VAIQMatrixBufferMPEG4 *iq_matrix;

    int i;

    av_dlog(avctx, "vaapi_mpeg4_start_frame()\n");

    vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG4);

    /* Fill in VAPictureParameterBufferMPEG4 */

    pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG4));

    if (!pic_param)

        return -1;

    pic_param->vop_width                                = s->width;

    pic_param->vop_height                               = s->height;

    pic_param->forward_reference_picture                = VA_INVALID_ID;

    pic_param->backward_reference_picture               = VA_INVALID_ID;

    pic_param->vol_fields.value                         = 0; /* reset all bits */

    pic_param->vol_fields.bits.short_video_header       = avctx->codec->id == CODEC_ID_H263;

    pic_param->vol_fields.bits.chroma_format            = CHROMA_420;

    pic_param->vol_fields.bits.interlaced               = !s->progressive_sequence;

    pic_param->vol_fields.bits.obmc_disable             = 1;

    pic_param->vol_fields.bits.sprite_enable            = s->vol_sprite_usage;

    pic_param->vol_fields.bits.sprite_warping_accuracy  = s->sprite_warping_accuracy;

    pic_param->vol_fields.bits.quant_type               = s->mpeg_quant;

    pic_param->vol_fields.bits.quarter_sample           = s->quarter_sample;

    pic_param->vol_fields.bits.data_partitioned         = s->data_partitioning;

    pic_param->vol_fields.bits.reversible_vlc           = s->rvlc;

    pic_param->vol_fields.bits.resync_marker_disable    = !s->resync_marker;

    pic_param->no_of_sprite_warping_points              = s->num_sprite_warping_points;

    for (i = 0; i < s->num_sprite_warping_points && i < 3; i++) {

        pic_param->sprite_trajectory_du[i]              = s->sprite_traj[i][0];

        pic_param->sprite_trajectory_dv[i]              = s->sprite_traj[i][1];

    }

    pic_param->quant_precision                          = s->quant_precision;

    pic_param->vop_fields.value                         = 0; /* reset all bits */

    pic_param->vop_fields.bits.vop_coding_type          = s->pict_type - FF_I_TYPE;

    pic_param->vop_fields.bits.backward_reference_vop_coding_type = s->pict_type == FF_B_TYPE ? s->next_picture.pict_type - FF_I_TYPE : 0;

    pic_param->vop_fields.bits.vop_rounding_type        = s->no_rounding;

    pic_param->vop_fields.bits.intra_dc_vlc_thr         = mpeg4_get_intra_dc_vlc_thr(s);

    pic_param->vop_fields.bits.top_field_first          = s->top_field_first;

    pic_param->vop_fields.bits.alternate_vertical_scan_flag = s->alternate_scan;

    pic_param->vop_fcode_forward                        = s->f_code;

    pic_param->vop_fcode_backward                       = s->b_code;

    pic_param->vop_time_increment_resolution            = avctx->time_base.den;

    pic_param->num_macroblocks_in_gob                   = s->mb_width * ff_h263_get_gob_height(s);

    pic_param->num_gobs_in_vop                          = (s->mb_width * s->mb_height) / pic_param->num_macroblocks_in_gob;

    pic_param->TRB                                      = s->pb_time;

    pic_param->TRD                                      = s->pp_time;

    if (s->pict_type == FF_B_TYPE)

        pic_param->backward_reference_picture = ff_vaapi_get_surface_id(&s->next_picture);

    if (s->pict_type != FF_I_TYPE)

        pic_param->forward_reference_picture  = ff_vaapi_get_surface_id(&s->last_picture);

    /* Fill in VAIQMatrixBufferMPEG4 */

    /* Only the first inverse quantisation method uses the weighthing matrices */

    if (pic_param->vol_fields.bits.quant_type) {

        iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG4));

        if (!iq_matrix)

            return -1;

        iq_matrix->load_intra_quant_mat         = 1;

        iq_matrix->load_non_intra_quant_mat     = 1;

        for (i = 0; i < 64; i++) {

            int n = s->dsp.idct_permutation[ff_zigzag_direct[i]];

            iq_matrix->intra_quant_mat[i]       = s->intra_matrix[n];

            iq_matrix->non_intra_quant_mat[i]   = s->inter_matrix[n];

        }

    }

    return 0;

}

static int vaapi_mpeg4_end_frame(AVCodecContext *avctx)

{

    return ff_vaapi_common_end_frame(avctx->priv_data);

}

static int vaapi_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)

{

    MpegEncContext * const s = avctx->priv_data;

    VASliceParameterBufferMPEG4 *slice_param;

    av_dlog(avctx, "vaapi_mpeg4_decode_slice(): buffer %p, size %d\n", buffer, size);

    /* video_plane_with_short_video_header() contains all GOBs

     * in-order, and this is what VA API (Intel backend) expects: only

     * a single slice param. So fake macroblock_number for FFmpeg so

     * that we don't call vaapi_mpeg4_decode_slice() again

     */

    if (avctx->codec->id == CODEC_ID_H263)

        size = s->gb.buffer_end - buffer;

    /* Fill in VASliceParameterBufferMPEG4 */

    slice_param = (VASliceParameterBufferMPEG4 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);

    if (!slice_param)

        return -1;

    slice_param->macroblock_offset      = get_bits_count(&s->gb) % 8;

    slice_param->macroblock_number      = s->mb_y * s->mb_width + s->mb_x;

    slice_param->quant_scale            = s->qscale;

    if (avctx->codec->id == CODEC_ID_H263)

        s->mb_y = s->mb_height;

    return 0;

}

#if CONFIG_MPEG4_VAAPI_HWACCEL

AVHWAccel ff_mpeg4_vaapi_hwaccel = {

    .name           = "mpeg4_vaapi",

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = CODEC_ID_MPEG4,

    .pix_fmt        = PIX_FMT_VAAPI_VLD,

    .capabilities   = 0,

    .start_frame    = vaapi_mpeg4_start_frame,

    .end_frame      = vaapi_mpeg4_end_frame,

    .decode_slice   = vaapi_mpeg4_decode_slice,

    .priv_data_size = 0,

};

#endif

#if CONFIG_H263_VAAPI_HWACCEL

AVHWAccel ff_h263_vaapi_hwaccel = {

    .name           = "h263_vaapi",

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = CODEC_ID_H263,

    .pix_fmt        = PIX_FMT_VAAPI_VLD,

    .capabilities   = 0,

    .start_frame    = vaapi_mpeg4_start_frame,

    .end_frame      = vaapi_mpeg4_end_frame,

    .decode_slice   = vaapi_mpeg4_decode_slice,

    .priv_data_size = 0,

};

#endif