ee7b53692878b1d9083a4f5ab18be57bc0c96b21
[ffmpeg.git] / libavcodec / vaapi_mpeg2.c
1 /*
2  * MPEG-2 HW decode acceleration through VA API
3  *
4  * Copyright (C) 2008-2009 Splitted-Desktop Systems
5  *
6  * This file is part of Libav.
7  *
8  * Libav 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  * Libav 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 Libav; 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 "dsputil.h"
25
26 /** Reconstruct bitstream f_code */
27 static inline int mpeg2_get_f_code(MpegEncContext *s)
28 {
29     return (s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) |
30            (s->mpeg_f_code[1][0] <<  4) |  s->mpeg_f_code[1][1];
31 }
32
33 /** Determine frame start: first field for field picture or frame picture */
34 static inline int mpeg2_get_is_frame_start(MpegEncContext *s)
35 {
36     return s->first_field || s->picture_structure == PICT_FRAME;
37 }
38
39 static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
40 {
41     struct MpegEncContext * const s = avctx->priv_data;
42     struct vaapi_context * const vactx = avctx->hwaccel_context;
43     VAPictureParameterBufferMPEG2 *pic_param;
44     VAIQMatrixBufferMPEG2 *iq_matrix;
45     int i;
46
47     av_dlog(avctx, "vaapi_mpeg2_start_frame()\n");
48
49     vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG2);
50
51     /* Fill in VAPictureParameterBufferMPEG2 */
52     pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG2));
53     if (!pic_param)
54         return -1;
55     pic_param->horizontal_size                                  = s->width;
56     pic_param->vertical_size                                    = s->height;
57     pic_param->forward_reference_picture                        = VA_INVALID_ID;
58     pic_param->backward_reference_picture                       = VA_INVALID_ID;
59     pic_param->picture_coding_type                              = s->pict_type;
60     pic_param->f_code                                           = mpeg2_get_f_code(s);
61     pic_param->picture_coding_extension.value                   = 0; /* reset all bits */
62     pic_param->picture_coding_extension.bits.intra_dc_precision = s->intra_dc_precision;
63     pic_param->picture_coding_extension.bits.picture_structure  = s->picture_structure;
64     pic_param->picture_coding_extension.bits.top_field_first    = s->top_field_first;
65     pic_param->picture_coding_extension.bits.frame_pred_frame_dct = s->frame_pred_frame_dct;
66     pic_param->picture_coding_extension.bits.concealment_motion_vectors = s->concealment_motion_vectors;
67     pic_param->picture_coding_extension.bits.q_scale_type       = s->q_scale_type;
68     pic_param->picture_coding_extension.bits.intra_vlc_format   = s->intra_vlc_format;
69     pic_param->picture_coding_extension.bits.alternate_scan     = s->alternate_scan;
70     pic_param->picture_coding_extension.bits.repeat_first_field = s->repeat_first_field;
71     pic_param->picture_coding_extension.bits.progressive_frame  = s->progressive_frame;
72     pic_param->picture_coding_extension.bits.is_first_field     = mpeg2_get_is_frame_start(s);
73
74     switch (s->pict_type) {
75     case AV_PICTURE_TYPE_B:
76         pic_param->backward_reference_picture = ff_vaapi_get_surface_id(&s->next_picture);
77         // fall-through
78     case AV_PICTURE_TYPE_P:
79         pic_param->forward_reference_picture = ff_vaapi_get_surface_id(&s->last_picture);
80         break;
81     }
82
83     /* Fill in VAIQMatrixBufferMPEG2 */
84     iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG2));
85     if (!iq_matrix)
86         return -1;
87     iq_matrix->load_intra_quantiser_matrix              = 1;
88     iq_matrix->load_non_intra_quantiser_matrix          = 1;
89     iq_matrix->load_chroma_intra_quantiser_matrix       = 1;
90     iq_matrix->load_chroma_non_intra_quantiser_matrix   = 1;
91
92     for (i = 0; i < 64; i++) {
93         int n = s->dsp.idct_permutation[ff_zigzag_direct[i]];
94         iq_matrix->intra_quantiser_matrix[i]            = s->intra_matrix[n];
95         iq_matrix->non_intra_quantiser_matrix[i]        = s->inter_matrix[n];
96         iq_matrix->chroma_intra_quantiser_matrix[i]     = s->chroma_intra_matrix[n];
97         iq_matrix->chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n];
98     }
99     return 0;
100 }
101
102 static int vaapi_mpeg2_end_frame(AVCodecContext *avctx)
103 {
104     return ff_vaapi_common_end_frame(avctx->priv_data);
105 }
106
107 static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
108 {
109     MpegEncContext * const s = avctx->priv_data;
110     VASliceParameterBufferMPEG2 *slice_param;
111     GetBitContext gb;
112     uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset;
113
114     av_dlog(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size);
115
116     /* Determine macroblock_offset */
117     init_get_bits(&gb, buffer, 8 * size);
118     if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */
119         return AVERROR_INVALIDDATA;
120     quantiser_scale_code = get_bits(&gb, 5);
121     intra_slice_flag = get_bits1(&gb);
122     if (intra_slice_flag) {
123         skip_bits(&gb, 8);
124         while (get_bits1(&gb) != 0)
125             skip_bits(&gb, 8);
126     }
127     macroblock_offset = get_bits_count(&gb);
128
129     /* Fill in VASliceParameterBufferMPEG2 */
130     slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
131     if (!slice_param)
132         return -1;
133     slice_param->macroblock_offset              = macroblock_offset;
134     slice_param->slice_horizontal_position      = s->mb_x;
135     slice_param->slice_vertical_position        = s->mb_y >> (s->picture_structure != PICT_FRAME);
136     slice_param->quantiser_scale_code           = quantiser_scale_code;
137     slice_param->intra_slice_flag               = intra_slice_flag;
138     return 0;
139 }
140
141 AVHWAccel ff_mpeg2_vaapi_hwaccel = {
142     .name           = "mpeg2_vaapi",
143     .type           = AVMEDIA_TYPE_VIDEO,
144     .id             = CODEC_ID_MPEG2VIDEO,
145     .pix_fmt        = PIX_FMT_VAAPI_VLD,
146     .start_frame    = vaapi_mpeg2_start_frame,
147     .end_frame      = vaapi_mpeg2_end_frame,
148     .decode_slice   = vaapi_mpeg2_decode_slice,
149 };