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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 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 "mpegutils.h" | |
24 | #include "vaapi_internal.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.f); | |
77 | // fall-through | |
78 | case AV_PICTURE_TYPE_P: | |
79 | pic_param->forward_reference_picture = ff_vaapi_get_surface_id(s->last_picture.f); | |
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->idsp.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_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size) | |
103 | { | |
104 | MpegEncContext * const s = avctx->priv_data; | |
105 | VASliceParameterBufferMPEG2 *slice_param; | |
106 | GetBitContext gb; | |
107 | uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset; | |
108 | ||
109 | av_dlog(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size); | |
110 | ||
111 | /* Determine macroblock_offset */ | |
112 | init_get_bits(&gb, buffer, 8 * size); | |
113 | if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */ | |
114 | return AVERROR_INVALIDDATA; | |
115 | quantiser_scale_code = get_bits(&gb, 5); | |
116 | intra_slice_flag = get_bits1(&gb); | |
117 | if (intra_slice_flag) { | |
118 | skip_bits(&gb, 8); | |
119 | if (skip_1stop_8data_bits(&gb) < 0) | |
120 | return AVERROR_INVALIDDATA; | |
121 | } | |
122 | macroblock_offset = get_bits_count(&gb); | |
123 | ||
124 | /* Fill in VASliceParameterBufferMPEG2 */ | |
125 | slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size); | |
126 | if (!slice_param) | |
127 | return -1; | |
128 | slice_param->macroblock_offset = macroblock_offset; | |
129 | slice_param->slice_horizontal_position = s->mb_x; | |
130 | slice_param->slice_vertical_position = s->mb_y >> (s->picture_structure != PICT_FRAME); | |
131 | slice_param->quantiser_scale_code = quantiser_scale_code; | |
132 | slice_param->intra_slice_flag = intra_slice_flag; | |
133 | return 0; | |
134 | } | |
135 | ||
136 | AVHWAccel ff_mpeg2_vaapi_hwaccel = { | |
137 | .name = "mpeg2_vaapi", | |
138 | .type = AVMEDIA_TYPE_VIDEO, | |
139 | .id = AV_CODEC_ID_MPEG2VIDEO, | |
140 | .pix_fmt = AV_PIX_FMT_VAAPI_VLD, | |
141 | .start_frame = vaapi_mpeg2_start_frame, | |
142 | .end_frame = ff_vaapi_mpeg_end_frame, | |
143 | .decode_slice = vaapi_mpeg2_decode_slice, | |
144 | }; |