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vaapi_mpeg4.c
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1 /*
2  * MPEG-4 / H.263 HW decode acceleration through VA API
3  *
4  * Copyright (C) 2008-2009 Splitted-Desktop Systems
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "vaapi_internal.h"
24 #include "h263.h"
25 #include "mpeg4video.h"
26 
27 /** Reconstruct bitstream intra_dc_vlc_thr */
28 static int mpeg4_get_intra_dc_vlc_thr(Mpeg4DecContext *s)
29 {
30  switch (s->intra_dc_threshold) {
31  case 99: return 0;
32  case 13: return 1;
33  case 15: return 2;
34  case 17: return 3;
35  case 19: return 4;
36  case 21: return 5;
37  case 23: return 6;
38  case 0: return 7;
39  }
40  return 0;
41 }
42 
43 static int vaapi_mpeg4_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
44 {
45  Mpeg4DecContext *ctx = avctx->priv_data;
46  MpegEncContext * const s = &ctx->m;
47  struct vaapi_context * const vactx = avctx->hwaccel_context;
48  VAPictureParameterBufferMPEG4 *pic_param;
49  VAIQMatrixBufferMPEG4 *iq_matrix;
50  int i;
51 
52  av_dlog(avctx, "vaapi_mpeg4_start_frame()\n");
53 
54  vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG4);
55 
56  /* Fill in VAPictureParameterBufferMPEG4 */
57  pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG4));
58  if (!pic_param)
59  return -1;
60  pic_param->vop_width = s->width;
61  pic_param->vop_height = s->height;
62  pic_param->forward_reference_picture = VA_INVALID_ID;
63  pic_param->backward_reference_picture = VA_INVALID_ID;
64  pic_param->vol_fields.value = 0; /* reset all bits */
65  pic_param->vol_fields.bits.short_video_header = avctx->codec->id == AV_CODEC_ID_H263;
66  pic_param->vol_fields.bits.chroma_format = CHROMA_420;
67  pic_param->vol_fields.bits.interlaced = !s->progressive_sequence;
68  pic_param->vol_fields.bits.obmc_disable = 1;
69  pic_param->vol_fields.bits.sprite_enable = ctx->vol_sprite_usage;
70  pic_param->vol_fields.bits.sprite_warping_accuracy = s->sprite_warping_accuracy;
71  pic_param->vol_fields.bits.quant_type = s->mpeg_quant;
72  pic_param->vol_fields.bits.quarter_sample = s->quarter_sample;
73  pic_param->vol_fields.bits.data_partitioned = s->data_partitioning;
74  pic_param->vol_fields.bits.reversible_vlc = ctx->rvlc;
75  pic_param->vol_fields.bits.resync_marker_disable = !ctx->resync_marker;
76  pic_param->no_of_sprite_warping_points = ctx->num_sprite_warping_points;
77  for (i = 0; i < ctx->num_sprite_warping_points && i < 3; i++) {
78  pic_param->sprite_trajectory_du[i] = ctx->sprite_traj[i][0];
79  pic_param->sprite_trajectory_dv[i] = ctx->sprite_traj[i][1];
80  }
81  pic_param->quant_precision = s->quant_precision;
82  pic_param->vop_fields.value = 0; /* reset all bits */
83  pic_param->vop_fields.bits.vop_coding_type = s->pict_type - AV_PICTURE_TYPE_I;
84  pic_param->vop_fields.bits.backward_reference_vop_coding_type = s->pict_type == AV_PICTURE_TYPE_B ? s->next_picture.f.pict_type - AV_PICTURE_TYPE_I : 0;
85  pic_param->vop_fields.bits.vop_rounding_type = s->no_rounding;
86  pic_param->vop_fields.bits.intra_dc_vlc_thr = mpeg4_get_intra_dc_vlc_thr(ctx);
87  pic_param->vop_fields.bits.top_field_first = s->top_field_first;
88  pic_param->vop_fields.bits.alternate_vertical_scan_flag = s->alternate_scan;
89  pic_param->vop_fcode_forward = s->f_code;
90  pic_param->vop_fcode_backward = s->b_code;
91  pic_param->vop_time_increment_resolution = avctx->time_base.den;
92  pic_param->num_macroblocks_in_gob = s->mb_width * ff_h263_get_gob_height(s);
93  pic_param->num_gobs_in_vop = (s->mb_width * s->mb_height) / pic_param->num_macroblocks_in_gob;
94  pic_param->TRB = s->pb_time;
95  pic_param->TRD = s->pp_time;
96 
97  if (s->pict_type == AV_PICTURE_TYPE_B)
98  pic_param->backward_reference_picture = ff_vaapi_get_surface_id(&s->next_picture);
99  if (s->pict_type != AV_PICTURE_TYPE_I)
100  pic_param->forward_reference_picture = ff_vaapi_get_surface_id(&s->last_picture);
101 
102  /* Fill in VAIQMatrixBufferMPEG4 */
103  /* Only the first inverse quantisation method uses the weighting matrices */
104  if (pic_param->vol_fields.bits.quant_type) {
105  iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG4));
106  if (!iq_matrix)
107  return -1;
108  iq_matrix->load_intra_quant_mat = 1;
109  iq_matrix->load_non_intra_quant_mat = 1;
110 
111  for (i = 0; i < 64; i++) {
112  int n = s->dsp.idct_permutation[ff_zigzag_direct[i]];
113  iq_matrix->intra_quant_mat[i] = s->intra_matrix[n];
114  iq_matrix->non_intra_quant_mat[i] = s->inter_matrix[n];
115  }
116  }
117  return 0;
118 }
119 
120 static int vaapi_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
121 {
122  MpegEncContext * const s = avctx->priv_data;
123  VASliceParameterBufferMPEG4 *slice_param;
124 
125  av_dlog(avctx, "vaapi_mpeg4_decode_slice(): buffer %p, size %d\n", buffer, size);
126 
127  /* Fill in VASliceParameterBufferMPEG4 */
128  slice_param = (VASliceParameterBufferMPEG4 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
129  if (!slice_param)
130  return -1;
131  slice_param->macroblock_offset = get_bits_count(&s->gb) % 8;
132  slice_param->macroblock_number = 0;
133  slice_param->quant_scale = s->qscale;
134 
135  return 0;
136 }
137 
138 #if CONFIG_MPEG4_VAAPI_HWACCEL
139 AVHWAccel ff_mpeg4_vaapi_hwaccel = {
140  .name = "mpeg4_vaapi",
141  .type = AVMEDIA_TYPE_VIDEO,
142  .id = AV_CODEC_ID_MPEG4,
143  .pix_fmt = AV_PIX_FMT_VAAPI_VLD,
144  .start_frame = vaapi_mpeg4_start_frame,
145  .end_frame = ff_vaapi_mpeg_end_frame,
146  .decode_slice = vaapi_mpeg4_decode_slice,
147 };
148 #endif
149 
150 #if CONFIG_H263_VAAPI_HWACCEL
151 AVHWAccel ff_h263_vaapi_hwaccel = {
152  .name = "h263_vaapi",
153  .type = AVMEDIA_TYPE_VIDEO,
154  .id = AV_CODEC_ID_H263,
155  .pix_fmt = AV_PIX_FMT_VAAPI_VLD,
156  .start_frame = vaapi_mpeg4_start_frame,
157  .end_frame = ff_vaapi_mpeg_end_frame,
158  .decode_slice = vaapi_mpeg4_decode_slice,
159 };
160 #endif
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