git.sesse.net Git - ffmpeg/blob - libavcodec/vdpau_h264.c

   1 /*
   2  * MPEG-4 Part 10 / AVC / H.264 HW decode acceleration through VDPAU
   3  *
   4  * Copyright (c) 2008 NVIDIA
   5  * Copyright (c) 2013 Rémi Denis-Courmont
   6  *
   7  * This file is part of FFmpeg.
   8  *
   9  * FFmpeg is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * FFmpeg is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with FFmpeg; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include <vdpau/vdpau.h>
  25
  26 #include "avcodec.h"
  27 #include "h264.h"
  28 #include "vdpau.h"
  29 #include "vdpau_internal.h"
  30
  31 static int32_t h264_foc(int foc)
  32 {
  33     if (foc == INT_MAX)
  34         foc = 0;
  35     return foc;
  36 }
  37
  38 static void vdpau_h264_clear_rf(VdpReferenceFrameH264 *rf)
  39 {
  40     rf->surface             = VDP_INVALID_HANDLE;
  41     rf->is_long_term        = VDP_FALSE;
  42     rf->top_is_reference    = VDP_FALSE;
  43     rf->bottom_is_reference = VDP_FALSE;
  44     rf->field_order_cnt[0]  = 0;
  45     rf->field_order_cnt[1]  = 0;
  46     rf->frame_idx           = 0;
  47 }
  48
  49 static void vdpau_h264_set_rf(VdpReferenceFrameH264 *rf, Picture *pic,
  50                               int pic_structure)
  51 {
  52     VdpVideoSurface surface = ff_vdpau_get_surface_id(pic);
  53
  54     if (pic_structure == 0)
  55         pic_structure = pic->reference;
  56
  57     rf->surface             = surface;
  58     rf->is_long_term        = pic->reference && pic->long_ref;
  59     rf->top_is_reference    = (pic_structure & PICT_TOP_FIELD)    != 0;
  60     rf->bottom_is_reference = (pic_structure & PICT_BOTTOM_FIELD) != 0;
  61     rf->field_order_cnt[0]  = h264_foc(pic->field_poc[0]);
  62     rf->field_order_cnt[1]  = h264_foc(pic->field_poc[1]);
  63     rf->frame_idx           = pic->long_ref ? pic->pic_id : pic->frame_num;
  64 }
  65
  66 static void vdpau_h264_set_reference_frames(AVCodecContext *avctx)
  67 {
  68     H264Context * const h = avctx->priv_data;
  69     AVVDPAUContext *hwctx = avctx->hwaccel_context;
  70     VdpPictureInfoH264 *info = &hwctx->info.h264;
  71     int list;
  72
  73     VdpReferenceFrameH264 *rf = &info->referenceFrames[0];
  74 #define H264_RF_COUNT FF_ARRAY_ELEMS(info->referenceFrames)
  75
  76     for (list = 0; list < 2; ++list) {
  77         Picture **lp = list ? h->long_ref : h->short_ref;
  78         int i, ls    = list ? 16          : h->short_ref_count;
  79
  80         for (i = 0; i < ls; ++i) {
  81             Picture *pic = lp[i];
  82             VdpReferenceFrameH264 *rf2;
  83             VdpVideoSurface surface_ref;
  84             int pic_frame_idx;
  85
  86             if (!pic || !pic->reference)
  87                 continue;
  88             pic_frame_idx = pic->long_ref ? pic->pic_id : pic->frame_num;
  89             surface_ref = ff_vdpau_get_surface_id(pic);
  90
  91             rf2 = &info->referenceFrames[0];
  92             while (rf2 != rf) {
  93                 if ((rf2->surface      == surface_ref)   &&
  94                     (rf2->is_long_term == pic->long_ref) &&
  95                     (rf2->frame_idx    == pic_frame_idx))
  96                     break;
  97                 ++rf2;
  98             }
  99             if (rf2 != rf) {
 100                 rf2->top_is_reference    |= (pic->reference & PICT_TOP_FIELD)    ? VDP_TRUE : VDP_FALSE;
 101                 rf2->bottom_is_reference |= (pic->reference & PICT_BOTTOM_FIELD) ? VDP_TRUE : VDP_FALSE;
 102                 continue;
 103             }
 104
 105             if (rf >= &info->referenceFrames[H264_RF_COUNT])
 106                 continue;
 107
 108             vdpau_h264_set_rf(rf, pic, pic->reference);
 109             ++rf;
 110         }
 111     }
 112
 113     for (; rf < &info->referenceFrames[H264_RF_COUNT]; ++rf)
 114         vdpau_h264_clear_rf(rf);
 115 }
 116
 117 static int vdpau_h264_start_frame(AVCodecContext *avctx,
 118                                   const uint8_t *buffer, uint32_t size)
 119 {
 120     H264Context * const h = avctx->priv_data;
 121     AVVDPAUContext *hwctx = avctx->hwaccel_context;
 122     VdpPictureInfoH264 *info = &hwctx->info.h264;
 123     Picture *pic = h->cur_pic_ptr;
 124
 125     /* init VdpPictureInfoH264 */
 126     info->slice_count                            = 0;
 127     info->field_order_cnt[0]                     = h264_foc(pic->field_poc[0]);
 128     info->field_order_cnt[1]                     = h264_foc(pic->field_poc[1]);
 129     info->is_reference                           = h->nal_ref_idc != 0;
 130     info->frame_num                              = h->frame_num;
 131     info->field_pic_flag                         = h->picture_structure != PICT_FRAME;
 132     info->bottom_field_flag                      = h->picture_structure == PICT_BOTTOM_FIELD;
 133     info->num_ref_frames                         = h->sps.ref_frame_count;
 134     info->mb_adaptive_frame_field_flag           = h->sps.mb_aff && !info->field_pic_flag;
 135     info->constrained_intra_pred_flag            = h->pps.constrained_intra_pred;
 136     info->weighted_pred_flag                     = h->pps.weighted_pred;
 137     info->weighted_bipred_idc                    = h->pps.weighted_bipred_idc;
 138     info->frame_mbs_only_flag                    = h->sps.frame_mbs_only_flag;
 139     info->transform_8x8_mode_flag                = h->pps.transform_8x8_mode;
 140     info->chroma_qp_index_offset                 = h->pps.chroma_qp_index_offset[0];
 141     info->second_chroma_qp_index_offset          = h->pps.chroma_qp_index_offset[1];
 142     info->pic_init_qp_minus26                    = h->pps.init_qp - 26;
 143     info->num_ref_idx_l0_active_minus1           = h->pps.ref_count[0] - 1;
 144     info->num_ref_idx_l1_active_minus1           = h->pps.ref_count[1] - 1;
 145     info->log2_max_frame_num_minus4              = h->sps.log2_max_frame_num - 4;
 146     info->pic_order_cnt_type                     = h->sps.poc_type;
 147     info->log2_max_pic_order_cnt_lsb_minus4      = h->sps.poc_type ? 0 : h->sps.log2_max_poc_lsb - 4;
 148     info->delta_pic_order_always_zero_flag       = h->sps.delta_pic_order_always_zero_flag;
 149     info->direct_8x8_inference_flag              = h->sps.direct_8x8_inference_flag;
 150     info->entropy_coding_mode_flag               = h->pps.cabac;
 151     info->pic_order_present_flag                 = h->pps.pic_order_present;
 152     info->deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
 153     info->redundant_pic_cnt_present_flag         = h->pps.redundant_pic_cnt_present;
 154
 155     memcpy(info->scaling_lists_4x4, h->pps.scaling_matrix4,
 156            sizeof(info->scaling_lists_4x4));
 157     memcpy(info->scaling_lists_8x8[0], h->pps.scaling_matrix8[0],
 158            sizeof(info->scaling_lists_8x8[0]));
 159     memcpy(info->scaling_lists_8x8[1], h->pps.scaling_matrix8[3],
 160            sizeof(info->scaling_lists_8x8[1]));
 161
 162     vdpau_h264_set_reference_frames(avctx);
 163
 164     return ff_vdpau_common_start_frame(avctx, buffer, size);
 165 }
 166
 167 static const uint8_t start_code_prefix[3] = { 0x00, 0x00, 0x01 };
 168
 169 static int vdpau_h264_decode_slice(AVCodecContext *avctx,
 170                                    const uint8_t *buffer, uint32_t size)
 171 {
 172     AVVDPAUContext *hwctx = avctx->hwaccel_context;
 173     int val;
 174
 175     val = ff_vdpau_add_buffer(avctx, start_code_prefix, 3);
 176     if (val)
 177         return val;
 178
 179     val = ff_vdpau_add_buffer(avctx, buffer, size);
 180     if (val)
 181         return val;
 182
 183     hwctx->info.h264.slice_count++;
 184     return 0;
 185 }
 186
 187 static int vdpau_h264_end_frame(AVCodecContext *avctx)
 188 {
 189     AVVDPAUContext *hwctx = avctx->hwaccel_context;
 190     H264Context *h = avctx->priv_data;
 191     VdpVideoSurface surf = ff_vdpau_get_surface_id(h->cur_pic_ptr);
 192
 193     hwctx->render(hwctx->decoder, surf, (void *)&hwctx->info,
 194                   hwctx->bitstream_buffers_used, hwctx->bitstream_buffers);
 195
 196     ff_h264_draw_horiz_band(h, 0, h->avctx->height);
 197     hwctx->bitstream_buffers_used = 0;
 198
 199     return 0;
 200 }
 201
 202 AVHWAccel ff_h264_vdpau_hwaccel = {
 203     .name           = "h264_vdpau",
 204     .type           = AVMEDIA_TYPE_VIDEO,
 205     .id             = AV_CODEC_ID_H264,
 206     .pix_fmt        = AV_PIX_FMT_VDPAU,
 207     .start_frame    = vdpau_h264_start_frame,
 208     .end_frame      = vdpau_h264_end_frame,
 209     .decode_slice   = vdpau_h264_decode_slice,
 210 };