2 * MPEG-2 HW decode acceleration through VA API
4 * Copyright (C) 2008-2009 Splitted-Desktop Systems
6 * This file is part of FFmpeg.
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.
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.
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
23 #include "mpegutils.h"
24 #include "vaapi_internal.h"
26 /** Reconstruct bitstream f_code */
27 static inline int mpeg2_get_f_code(MpegEncContext
*s
)
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];
33 /** Determine frame start: first field for field picture or frame picture */
34 static inline int mpeg2_get_is_frame_start(MpegEncContext
*s
)
36 return s
->first_field
|| s
->picture_structure
== PICT_FRAME
;
39 static int vaapi_mpeg2_start_frame(AVCodecContext
*avctx
, av_unused
const uint8_t *buffer
, av_unused
uint32_t size
)
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
;
47 av_dlog(avctx
, "vaapi_mpeg2_start_frame()\n");
49 vactx
->slice_param_size
= sizeof(VASliceParameterBufferMPEG2
);
51 /* Fill in VAPictureParameterBufferMPEG2 */
52 pic_param
= ff_vaapi_alloc_pic_param(vactx
, sizeof(VAPictureParameterBufferMPEG2
));
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
);
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
);
78 case AV_PICTURE_TYPE_P
:
79 pic_param
->forward_reference_picture
= ff_vaapi_get_surface_id(s
->last_picture
.f
);
83 /* Fill in VAIQMatrixBufferMPEG2 */
84 iq_matrix
= ff_vaapi_alloc_iq_matrix(vactx
, sizeof(VAIQMatrixBufferMPEG2
));
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;
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
];
102 static int vaapi_mpeg2_decode_slice(AVCodecContext
*avctx
, const uint8_t *buffer
, uint32_t size
)
104 MpegEncContext
* const s
= avctx
->priv_data
;
105 VASliceParameterBufferMPEG2
*slice_param
;
107 uint32_t quantiser_scale_code
, intra_slice_flag
, macroblock_offset
;
109 av_dlog(avctx
, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer
, size
);
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
) {
119 if (skip_1stop_8data_bits(&gb
) < 0)
120 return AVERROR_INVALIDDATA
;
122 macroblock_offset
= get_bits_count(&gb
);
124 /* Fill in VASliceParameterBufferMPEG2 */
125 slice_param
= (VASliceParameterBufferMPEG2
*)ff_vaapi_alloc_slice(avctx
->hwaccel_context
, buffer
, size
);
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
;
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
,