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ffmpeg / libavcodec / vaapi_mpeg4.c @ e6d3534f

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/*
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 * MPEG-4 / H.263 HW decode acceleration through VA API
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 *
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 * Copyright (C) 2008-2009 Splitted-Desktop Systems
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "vaapi_internal.h"
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/** Reconstruct bitstream intra_dc_vlc_thr */
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static int mpeg4_get_intra_dc_vlc_thr(MpegEncContext *s)
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{
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    switch (s->intra_dc_threshold) {
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    case 99: return 0;
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    case 13: return 1;
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    case 15: return 2;
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    case 17: return 3;
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    case 19: return 4;
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    case 21: return 5;
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    case 23: return 6;
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    case 0:  return 7;
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    }
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    return 0;
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}
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static int vaapi_mpeg4_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
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{
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    MpegEncContext * const s = avctx->priv_data;
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    struct vaapi_context * const vactx = avctx->hwaccel_context;
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    VAPictureParameterBufferMPEG4 *pic_param;
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    VAIQMatrixBufferMPEG4 *iq_matrix;
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    int i;
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    dprintf(avctx, "vaapi_mpeg4_start_frame()\n");
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    vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG4);
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    /* Fill in VAPictureParameterBufferMPEG4 */
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    pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG4));
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    if (!pic_param)
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        return -1;
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    pic_param->vop_width                                = s->width;
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    pic_param->vop_height                               = s->height;
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    pic_param->forward_reference_picture                = VA_INVALID_ID;
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    pic_param->backward_reference_picture               = VA_INVALID_ID;
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    pic_param->vol_fields.value                         = 0; /* reset all bits */
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    pic_param->vol_fields.bits.short_video_header       = avctx->codec->id == CODEC_ID_H263;
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    pic_param->vol_fields.bits.chroma_format            = CHROMA_420;
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    pic_param->vol_fields.bits.interlaced               = !s->progressive_sequence;
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    pic_param->vol_fields.bits.obmc_disable             = 1;
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    pic_param->vol_fields.bits.sprite_enable            = s->vol_sprite_usage;
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    pic_param->vol_fields.bits.sprite_warping_accuracy  = s->sprite_warping_accuracy;
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    pic_param->vol_fields.bits.quant_type               = s->mpeg_quant;
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    pic_param->vol_fields.bits.quarter_sample           = s->quarter_sample;
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    pic_param->vol_fields.bits.data_partitioned         = s->data_partitioning;
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    pic_param->vol_fields.bits.reversible_vlc           = s->rvlc;
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    pic_param->vol_fields.bits.resync_marker_disable    = !s->resync_marker;
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    pic_param->no_of_sprite_warping_points              = s->num_sprite_warping_points;
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    for (i = 0; i < s->num_sprite_warping_points && i < 3; i++) {
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        pic_param->sprite_trajectory_du[i]              = s->sprite_traj[i][0];
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        pic_param->sprite_trajectory_dv[i]              = s->sprite_traj[i][1];
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    }
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    pic_param->quant_precision                          = s->quant_precision;
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    pic_param->vop_fields.value                         = 0; /* reset all bits */
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    pic_param->vop_fields.bits.vop_coding_type          = s->pict_type - FF_I_TYPE;
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    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;
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    pic_param->vop_fields.bits.vop_rounding_type        = s->no_rounding;
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    pic_param->vop_fields.bits.intra_dc_vlc_thr         = mpeg4_get_intra_dc_vlc_thr(s);
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    pic_param->vop_fields.bits.top_field_first          = s->top_field_first;
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    pic_param->vop_fields.bits.alternate_vertical_scan_flag = s->alternate_scan;
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    pic_param->vop_fcode_forward                        = s->f_code;
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    pic_param->vop_fcode_backward                       = s->b_code;
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    pic_param->vop_time_increment_resolution            = avctx->time_base.den;
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    pic_param->num_macroblocks_in_gob                   = s->mb_width * ff_h263_get_gob_height(s);
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    pic_param->num_gobs_in_vop                          = (s->mb_width * s->mb_height) / pic_param->num_macroblocks_in_gob;
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    pic_param->TRB                                      = s->pb_time;
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    pic_param->TRD                                      = s->pp_time;
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    if (s->pict_type == FF_B_TYPE)
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        pic_param->backward_reference_picture = ff_vaapi_get_surface_id(&s->next_picture);
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    if (s->pict_type != FF_I_TYPE)
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        pic_param->forward_reference_picture  = ff_vaapi_get_surface_id(&s->last_picture);
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    /* Fill in VAIQMatrixBufferMPEG4 */
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    /* Only the first inverse quantisation method uses the weighthing matrices */
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    if (pic_param->vol_fields.bits.quant_type) {
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        iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG4));
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        if (!iq_matrix)
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            return -1;
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        iq_matrix->load_intra_quant_mat         = 1;
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        iq_matrix->load_non_intra_quant_mat     = 1;
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        for (i = 0; i < 64; i++) {
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            int n = s->dsp.idct_permutation[ff_zigzag_direct[i]];
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            iq_matrix->intra_quant_mat[i]       = s->intra_matrix[n];
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            iq_matrix->non_intra_quant_mat[i]   = s->inter_matrix[n];
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        }
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    }
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    return 0;
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}
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static int vaapi_mpeg4_end_frame(AVCodecContext *avctx)
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{
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    return ff_vaapi_common_end_frame(avctx->priv_data);
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}
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static int vaapi_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
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{
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    MpegEncContext * const s = avctx->priv_data;
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    VASliceParameterBufferMPEG4 *slice_param;
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    dprintf(avctx, "vaapi_mpeg4_decode_slice(): buffer %p, size %d\n", buffer, size);
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    /* video_plane_with_short_video_header() contains all GOBs
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     * in-order, and this is what VA API (Intel backend) expects: only
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     * a single slice param. So fake macroblock_number for FFmpeg so
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     * that we don't call vaapi_mpeg4_decode_slice() again
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     */
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    if (avctx->codec->id == CODEC_ID_H263)
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        size = s->gb.buffer_end - buffer;
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    /* Fill in VASliceParameterBufferMPEG4 */
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    slice_param = (VASliceParameterBufferMPEG4 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
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    if (!slice_param)
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        return -1;
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    slice_param->macroblock_offset      = get_bits_count(&s->gb) % 8;
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    slice_param->macroblock_number      = s->mb_y * s->mb_width + s->mb_x;
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    slice_param->quant_scale            = s->qscale;
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    if (avctx->codec->id == CODEC_ID_H263)
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        s->mb_y = s->mb_height;
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    return 0;
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}
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#if CONFIG_MPEG4_VAAPI_HWACCEL
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AVHWAccel mpeg4_vaapi_hwaccel = {
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    .name           = "mpeg4_vaapi",
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    .type           = CODEC_TYPE_VIDEO,
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    .id             = CODEC_ID_MPEG4,
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    .pix_fmt        = PIX_FMT_VAAPI_VLD,
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    .capabilities   = 0,
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    .start_frame    = vaapi_mpeg4_start_frame,
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    .end_frame      = vaapi_mpeg4_end_frame,
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    .decode_slice   = vaapi_mpeg4_decode_slice,
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    .priv_data_size = 0,
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};
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#endif
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#if CONFIG_H263_VAAPI_HWACCEL
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AVHWAccel h263_vaapi_hwaccel = {
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    .name           = "h263_vaapi",
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    .type           = CODEC_TYPE_VIDEO,
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    .id             = CODEC_ID_H263,
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    .pix_fmt        = PIX_FMT_VAAPI_VLD,
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    .capabilities   = 0,
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    .start_frame    = vaapi_mpeg4_start_frame,
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    .end_frame      = vaapi_mpeg4_end_frame,
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    .decode_slice   = vaapi_mpeg4_decode_slice,
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    .priv_data_size = 0,
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};
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#endif