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libavcodec/vaapi_h264.c

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00001 /*
00002  * H.264 HW decode acceleration through VA API
00003  *
00004  * Copyright (C) 2008-2009 Splitted-Desktop Systems
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #include "vaapi_internal.h"
00024 #include "h264.h"
00025 
00036 static void init_vaapi_pic(VAPictureH264 *va_pic)
00037 {
00038     va_pic->picture_id          = VA_INVALID_ID;
00039     va_pic->flags               = VA_PICTURE_H264_INVALID;
00040     va_pic->TopFieldOrderCnt    = 0;
00041     va_pic->BottomFieldOrderCnt = 0;
00042 }
00043 
00052 static void fill_vaapi_pic(VAPictureH264 *va_pic,
00053                            Picture       *pic,
00054                            int            pic_structure)
00055 {
00056     if (pic_structure == 0)
00057         pic_structure = pic->reference;
00058     pic_structure &= PICT_FRAME; /* PICT_TOP_FIELD|PICT_BOTTOM_FIELD */
00059 
00060     va_pic->picture_id = ff_vaapi_get_surface_id(pic);
00061     va_pic->frame_idx  = pic->long_ref ? pic->pic_id : pic->frame_num;
00062 
00063     va_pic->flags      = 0;
00064     if (pic_structure != PICT_FRAME)
00065         va_pic->flags |= (pic_structure & PICT_TOP_FIELD) ? VA_PICTURE_H264_TOP_FIELD : VA_PICTURE_H264_BOTTOM_FIELD;
00066     if (pic->reference)
00067         va_pic->flags |= pic->long_ref ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE;
00068 
00069     va_pic->TopFieldOrderCnt = 0;
00070     if (pic->field_poc[0] != INT_MAX)
00071         va_pic->TopFieldOrderCnt = pic->field_poc[0];
00072 
00073     va_pic->BottomFieldOrderCnt = 0;
00074     if (pic->field_poc[1] != INT_MAX)
00075         va_pic->BottomFieldOrderCnt = pic->field_poc[1];
00076 }
00077 
00079 typedef struct DPB {
00080     int            size;        
00081     int            max_size;    
00082     VAPictureH264 *va_pics;     
00083 } DPB;
00084 
00091 static int dpb_add(DPB *dpb, Picture *pic)
00092 {
00093     int i;
00094 
00095     if (dpb->size >= dpb->max_size)
00096         return -1;
00097 
00098     for (i = 0; i < dpb->size; i++) {
00099         VAPictureH264 * const va_pic = &dpb->va_pics[i];
00100         if (va_pic->picture_id == ff_vaapi_get_surface_id(pic)) {
00101             VAPictureH264 temp_va_pic;
00102             fill_vaapi_pic(&temp_va_pic, pic, 0);
00103 
00104             if ((temp_va_pic.flags ^ va_pic->flags) & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD)) {
00105                 va_pic->flags |= temp_va_pic.flags & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD);
00106                 /* Merge second field */
00107                 if (temp_va_pic.flags & VA_PICTURE_H264_TOP_FIELD) {
00108                     va_pic->TopFieldOrderCnt    = temp_va_pic.TopFieldOrderCnt;
00109                 } else {
00110                     va_pic->BottomFieldOrderCnt = temp_va_pic.BottomFieldOrderCnt;
00111                 }
00112             }
00113             return 0;
00114         }
00115     }
00116 
00117     fill_vaapi_pic(&dpb->va_pics[dpb->size++], pic, 0);
00118     return 0;
00119 }
00120 
00122 static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264 *pic_param,
00123                                       H264Context                  *h)
00124 {
00125     DPB dpb;
00126     int i;
00127 
00128     dpb.size     = 0;
00129     dpb.max_size = FF_ARRAY_ELEMS(pic_param->ReferenceFrames);
00130     dpb.va_pics  = pic_param->ReferenceFrames;
00131     for (i = 0; i < dpb.max_size; i++)
00132         init_vaapi_pic(&dpb.va_pics[i]);
00133 
00134     for (i = 0; i < h->short_ref_count; i++) {
00135         Picture * const pic = h->short_ref[i];
00136         if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
00137             return -1;
00138     }
00139 
00140     for (i = 0; i < 16; i++) {
00141         Picture * const pic = h->long_ref[i];
00142         if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
00143             return -1;
00144     }
00145     return 0;
00146 }
00147 
00156 static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32],
00157                                   Picture      *ref_list,
00158                                   unsigned int  ref_count)
00159 {
00160     unsigned int i, n = 0;
00161     for (i = 0; i < ref_count; i++)
00162         if (ref_list[i].reference)
00163             fill_vaapi_pic(&RefPicList[n++], &ref_list[i], 0);
00164 
00165     for (; n < 32; n++)
00166         init_vaapi_pic(&RefPicList[n]);
00167 }
00168 
00184 static void fill_vaapi_plain_pred_weight_table(H264Context   *h,
00185                                                int            list,
00186                                                unsigned char *luma_weight_flag,
00187                                                short          luma_weight[32],
00188                                                short          luma_offset[32],
00189                                                unsigned char *chroma_weight_flag,
00190                                                short          chroma_weight[32][2],
00191                                                short          chroma_offset[32][2])
00192 {
00193     unsigned int i, j;
00194 
00195     *luma_weight_flag    = h->luma_weight_flag[list];
00196     *chroma_weight_flag  = h->chroma_weight_flag[list];
00197 
00198     for (i = 0; i < h->ref_count[list]; i++) {
00199         /* VA API also wants the inferred (default) values, not
00200            only what is available in the bitstream (7.4.3.2). */
00201         if (h->luma_weight_flag[list]) {
00202             luma_weight[i] = h->luma_weight[i][list][0];
00203             luma_offset[i] = h->luma_weight[i][list][1];
00204         } else {
00205             luma_weight[i] = 1 << h->luma_log2_weight_denom;
00206             luma_offset[i] = 0;
00207         }
00208         for (j = 0; j < 2; j++) {
00209             if (h->chroma_weight_flag[list]) {
00210                 chroma_weight[i][j] = h->chroma_weight[i][list][j][0];
00211                 chroma_offset[i][j] = h->chroma_weight[i][list][j][1];
00212             } else {
00213                 chroma_weight[i][j] = 1 << h->chroma_log2_weight_denom;
00214                 chroma_offset[i][j] = 0;
00215             }
00216         }
00217     }
00218 }
00219 
00221 static int start_frame(AVCodecContext          *avctx,
00222                        av_unused const uint8_t *buffer,
00223                        av_unused uint32_t       size)
00224 {
00225     H264Context * const h = avctx->priv_data;
00226     MpegEncContext * const s = &h->s;
00227     struct vaapi_context * const vactx = avctx->hwaccel_context;
00228     VAPictureParameterBufferH264 *pic_param;
00229     VAIQMatrixBufferH264 *iq_matrix;
00230 
00231     av_dlog(avctx, "start_frame()\n");
00232 
00233     vactx->slice_param_size = sizeof(VASliceParameterBufferH264);
00234 
00235     /* Fill in VAPictureParameterBufferH264. */
00236     pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferH264));
00237     if (!pic_param)
00238         return -1;
00239     fill_vaapi_pic(&pic_param->CurrPic, s->current_picture_ptr, s->picture_structure);
00240     if (fill_vaapi_ReferenceFrames(pic_param, h) < 0)
00241         return -1;
00242     pic_param->picture_width_in_mbs_minus1                      = s->mb_width - 1;
00243     pic_param->picture_height_in_mbs_minus1                     = s->mb_height - 1;
00244     pic_param->bit_depth_luma_minus8                            = h->sps.bit_depth_luma - 8;
00245     pic_param->bit_depth_chroma_minus8                          = h->sps.bit_depth_chroma - 8;
00246     pic_param->num_ref_frames                                   = h->sps.ref_frame_count;
00247     pic_param->seq_fields.value                                 = 0; /* reset all bits */
00248     pic_param->seq_fields.bits.chroma_format_idc                = h->sps.chroma_format_idc;
00249     pic_param->seq_fields.bits.residual_colour_transform_flag   = h->sps.residual_color_transform_flag; /* XXX: only for 4:4:4 high profile? */
00250     pic_param->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = h->sps.gaps_in_frame_num_allowed_flag;
00251     pic_param->seq_fields.bits.frame_mbs_only_flag              = h->sps.frame_mbs_only_flag;
00252     pic_param->seq_fields.bits.mb_adaptive_frame_field_flag     = h->sps.mb_aff;
00253     pic_param->seq_fields.bits.direct_8x8_inference_flag        = h->sps.direct_8x8_inference_flag;
00254     pic_param->seq_fields.bits.MinLumaBiPredSize8x8             = h->sps.level_idc >= 31; /* A.3.3.2 */
00255     pic_param->seq_fields.bits.log2_max_frame_num_minus4        = h->sps.log2_max_frame_num - 4;
00256     pic_param->seq_fields.bits.pic_order_cnt_type               = h->sps.poc_type;
00257     pic_param->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
00258     pic_param->seq_fields.bits.delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
00259     pic_param->num_slice_groups_minus1                          = h->pps.slice_group_count - 1;
00260     pic_param->slice_group_map_type                             = h->pps.mb_slice_group_map_type;
00261     pic_param->slice_group_change_rate_minus1                   = 0; /* XXX: unimplemented in FFmpeg */
00262     pic_param->pic_init_qp_minus26                              = h->pps.init_qp - 26;
00263     pic_param->pic_init_qs_minus26                              = h->pps.init_qs - 26;
00264     pic_param->chroma_qp_index_offset                           = h->pps.chroma_qp_index_offset[0];
00265     pic_param->second_chroma_qp_index_offset                    = h->pps.chroma_qp_index_offset[1];
00266     pic_param->pic_fields.value                                 = 0; /* reset all bits */
00267     pic_param->pic_fields.bits.entropy_coding_mode_flag         = h->pps.cabac;
00268     pic_param->pic_fields.bits.weighted_pred_flag               = h->pps.weighted_pred;
00269     pic_param->pic_fields.bits.weighted_bipred_idc              = h->pps.weighted_bipred_idc;
00270     pic_param->pic_fields.bits.transform_8x8_mode_flag          = h->pps.transform_8x8_mode;
00271     pic_param->pic_fields.bits.field_pic_flag                   = s->picture_structure != PICT_FRAME;
00272     pic_param->pic_fields.bits.constrained_intra_pred_flag      = h->pps.constrained_intra_pred;
00273     pic_param->pic_fields.bits.pic_order_present_flag           = h->pps.pic_order_present;
00274     pic_param->pic_fields.bits.deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
00275     pic_param->pic_fields.bits.redundant_pic_cnt_present_flag   = h->pps.redundant_pic_cnt_present;
00276     pic_param->pic_fields.bits.reference_pic_flag               = h->nal_ref_idc != 0;
00277     pic_param->frame_num                                        = h->frame_num;
00278 
00279     /* Fill in VAIQMatrixBufferH264. */
00280     iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferH264));
00281     if (!iq_matrix)
00282         return -1;
00283     memcpy(iq_matrix->ScalingList4x4, h->pps.scaling_matrix4, sizeof(iq_matrix->ScalingList4x4));
00284     memcpy(iq_matrix->ScalingList8x8[0], h->pps.scaling_matrix8[0], sizeof(iq_matrix->ScalingList8x8[0]));
00285     memcpy(iq_matrix->ScalingList8x8[1], h->pps.scaling_matrix8[3], sizeof(iq_matrix->ScalingList8x8[0]));
00286     return 0;
00287 }
00288 
00290 static int end_frame(AVCodecContext *avctx)
00291 {
00292     H264Context * const h = avctx->priv_data;
00293 
00294     av_dlog(avctx, "end_frame()\n");
00295     return ff_vaapi_common_end_frame(&h->s);
00296 }
00297 
00299 static int decode_slice(AVCodecContext *avctx,
00300                         const uint8_t  *buffer,
00301                         uint32_t        size)
00302 {
00303     H264Context * const h = avctx->priv_data;
00304     MpegEncContext * const s = &h->s;
00305     VASliceParameterBufferH264 *slice_param;
00306 
00307     av_dlog(avctx, "decode_slice(): buffer %p, size %d\n", buffer, size);
00308 
00309     /* Fill in VASliceParameterBufferH264. */
00310     slice_param = (VASliceParameterBufferH264 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
00311     if (!slice_param)
00312         return -1;
00313     slice_param->slice_data_bit_offset          = get_bits_count(&h->s.gb) + 8; /* bit buffer started beyond nal_unit_type */
00314     slice_param->first_mb_in_slice              = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x;
00315     slice_param->slice_type                     = ff_h264_get_slice_type(h);
00316     slice_param->direct_spatial_mv_pred_flag    = h->slice_type == AV_PICTURE_TYPE_B ? h->direct_spatial_mv_pred : 0;
00317     slice_param->num_ref_idx_l0_active_minus1   = h->list_count > 0 ? h->ref_count[0] - 1 : 0;
00318     slice_param->num_ref_idx_l1_active_minus1   = h->list_count > 1 ? h->ref_count[1] - 1 : 0;
00319     slice_param->cabac_init_idc                 = h->cabac_init_idc;
00320     slice_param->slice_qp_delta                 = s->qscale - h->pps.init_qp;
00321     slice_param->disable_deblocking_filter_idc  = h->deblocking_filter < 2 ? !h->deblocking_filter : h->deblocking_filter;
00322     slice_param->slice_alpha_c0_offset_div2     = h->slice_alpha_c0_offset / 2 - 26;
00323     slice_param->slice_beta_offset_div2         = h->slice_beta_offset     / 2 - 26;
00324     slice_param->luma_log2_weight_denom         = h->luma_log2_weight_denom;
00325     slice_param->chroma_log2_weight_denom       = h->chroma_log2_weight_denom;
00326 
00327     fill_vaapi_RefPicList(slice_param->RefPicList0, h->ref_list[0], h->list_count > 0 ? h->ref_count[0] : 0);
00328     fill_vaapi_RefPicList(slice_param->RefPicList1, h->ref_list[1], h->list_count > 1 ? h->ref_count[1] : 0);
00329 
00330     fill_vaapi_plain_pred_weight_table(h, 0,
00331                                        &slice_param->luma_weight_l0_flag,   slice_param->luma_weight_l0,   slice_param->luma_offset_l0,
00332                                        &slice_param->chroma_weight_l0_flag, slice_param->chroma_weight_l0, slice_param->chroma_offset_l0);
00333     fill_vaapi_plain_pred_weight_table(h, 1,
00334                                        &slice_param->luma_weight_l1_flag,   slice_param->luma_weight_l1,   slice_param->luma_offset_l1,
00335                                        &slice_param->chroma_weight_l1_flag, slice_param->chroma_weight_l1, slice_param->chroma_offset_l1);
00336     return 0;
00337 }
00338 
00339 AVHWAccel ff_h264_vaapi_hwaccel = {
00340     .name           = "h264_vaapi",
00341     .type           = AVMEDIA_TYPE_VIDEO,
00342     .id             = CODEC_ID_H264,
00343     .pix_fmt        = PIX_FMT_VAAPI_VLD,
00344     .capabilities   = 0,
00345     .start_frame    = start_frame,
00346     .end_frame      = end_frame,
00347     .decode_slice   = decode_slice,
00348     .priv_data_size = 0,
00349 };

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