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ffmpeg / libavcodec / vaapi_mpeg2.c @ dfd2a005

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/*
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 * MPEG-2 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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#include "dsputil.h"
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/** Reconstruct bitstream f_code */
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static inline int mpeg2_get_f_code(MpegEncContext *s)
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{
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    return ((s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) |
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            (s->mpeg_f_code[1][0] <<  4) |  s->mpeg_f_code[1][1]);
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}
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/** Determine frame start: first field for field picture or frame picture */
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static inline int mpeg2_get_is_frame_start(MpegEncContext *s)
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{
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    return s->first_field || s->picture_structure == PICT_FRAME;
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}
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static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
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{
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    struct MpegEncContext * const s = avctx->priv_data;
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    struct vaapi_context * const vactx = avctx->hwaccel_context;
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    VAPictureParameterBufferMPEG2 *pic_param;
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    VAIQMatrixBufferMPEG2 *iq_matrix;
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    int i;
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    av_dlog(avctx, "vaapi_mpeg2_start_frame()\n");
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    vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG2);
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    /* Fill in VAPictureParameterBufferMPEG2 */
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    pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG2));
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    if (!pic_param)
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        return -1;
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    pic_param->horizontal_size                                  = s->width;
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    pic_param->vertical_size                                    = 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->picture_coding_type                              = s->pict_type;
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    pic_param->f_code                                           = mpeg2_get_f_code(s);
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    pic_param->picture_coding_extension.value                   = 0; /* reset all bits */
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    pic_param->picture_coding_extension.bits.intra_dc_precision = s->intra_dc_precision;
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    pic_param->picture_coding_extension.bits.picture_structure  = s->picture_structure;
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    pic_param->picture_coding_extension.bits.top_field_first    = s->top_field_first;
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    pic_param->picture_coding_extension.bits.frame_pred_frame_dct = s->frame_pred_frame_dct;
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    pic_param->picture_coding_extension.bits.concealment_motion_vectors = s->concealment_motion_vectors;
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    pic_param->picture_coding_extension.bits.q_scale_type       = s->q_scale_type;
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    pic_param->picture_coding_extension.bits.intra_vlc_format   = s->intra_vlc_format;
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    pic_param->picture_coding_extension.bits.alternate_scan     = s->alternate_scan;
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    pic_param->picture_coding_extension.bits.repeat_first_field = s->repeat_first_field;
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    pic_param->picture_coding_extension.bits.progressive_frame  = s->progressive_frame;
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    pic_param->picture_coding_extension.bits.is_first_field     = mpeg2_get_is_frame_start(s);
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    switch (s->pict_type) {
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    case FF_B_TYPE:
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        pic_param->backward_reference_picture = ff_vaapi_get_surface_id(&s->next_picture);
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        // fall-through
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    case FF_P_TYPE:
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        pic_param->forward_reference_picture = ff_vaapi_get_surface_id(&s->last_picture);
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        break;
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    }
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    /* Fill in VAIQMatrixBufferMPEG2 */
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    iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG2));
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    if (!iq_matrix)
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        return -1;
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    iq_matrix->load_intra_quantiser_matrix              = 1;
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    iq_matrix->load_non_intra_quantiser_matrix          = 1;
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    iq_matrix->load_chroma_intra_quantiser_matrix       = 1;
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    iq_matrix->load_chroma_non_intra_quantiser_matrix   = 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_quantiser_matrix[i]            = s->intra_matrix[n];
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        iq_matrix->non_intra_quantiser_matrix[i]        = s->inter_matrix[n];
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        iq_matrix->chroma_intra_quantiser_matrix[i]     = s->chroma_intra_matrix[n];
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        iq_matrix->chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n];
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    }
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    return 0;
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}
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static int vaapi_mpeg2_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_mpeg2_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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    VASliceParameterBufferMPEG2 *slice_param;
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    GetBitContext gb;
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    uint32_t start_code, quantiser_scale_code, intra_slice_flag, macroblock_offset;
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    av_dlog(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size);
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    /* Determine macroblock_offset */
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    init_get_bits(&gb, buffer, 8 * size);
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    start_code = get_bits(&gb, 32);
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    assert((start_code & 0xffffff00) == 0x00000100);
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    quantiser_scale_code = get_bits(&gb, 5);
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    intra_slice_flag = get_bits1(&gb);
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    if (intra_slice_flag) {
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        skip_bits(&gb, 8);
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        while (get_bits1(&gb) != 0)
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            skip_bits(&gb, 8);
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    }
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    macroblock_offset = get_bits_count(&gb);
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    /* Fill in VASliceParameterBufferMPEG2 */
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    slice_param = (VASliceParameterBufferMPEG2 *)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              = macroblock_offset;
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    slice_param->slice_horizontal_position      = s->mb_x;
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    slice_param->slice_vertical_position        = s->mb_y;
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    slice_param->quantiser_scale_code           = quantiser_scale_code;
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    slice_param->intra_slice_flag               = intra_slice_flag;
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    return 0;
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}
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AVHWAccel ff_mpeg2_vaapi_hwaccel = {
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    .name           = "mpeg2_vaapi",
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = CODEC_ID_MPEG2VIDEO,
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    .pix_fmt        = PIX_FMT_VAAPI_VLD,
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    .capabilities   = 0,
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    .start_frame    = vaapi_mpeg2_start_frame,
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    .end_frame      = vaapi_mpeg2_end_frame,
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    .decode_slice   = vaapi_mpeg2_decode_slice,
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    .priv_data_size = 0,
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};