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vaapi_mpeg2.c
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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 "mpegvideo.h"
25 #include "vaapi_internal.h"
26 #include "internal.h"
27 
28 /** Reconstruct bitstream f_code */
29 static inline int mpeg2_get_f_code(MpegEncContext *s)
30 {
31  return (s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) |
32  (s->mpeg_f_code[1][0] << 4) | s->mpeg_f_code[1][1];
33 }
34 
35 /** Determine frame start: first field for field picture or frame picture */
37 {
38  return s->first_field || s->picture_structure == PICT_FRAME;
39 }
40 
42 {
43  struct MpegEncContext * const s = avctx->priv_data;
44  FFVAContext * const vactx = ff_vaapi_get_context(avctx);
45  VAPictureParameterBufferMPEG2 *pic_param;
46  VAIQMatrixBufferMPEG2 *iq_matrix;
47  int i;
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++) {
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 
103 {
104  MpegEncContext * const s = avctx->priv_data;
105  FFVAContext * const vactx = ff_vaapi_get_context(avctx);
106  VASliceParameterBufferMPEG2 *slice_param;
108  uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset;
109 
110  /* Determine macroblock_offset */
111  init_get_bits(&gb, buffer, 8 * size);
112  if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */
113  return AVERROR_INVALIDDATA;
114  quantiser_scale_code = get_bits(&gb, 5);
115  intra_slice_flag = get_bits1(&gb);
116  if (intra_slice_flag) {
117  skip_bits(&gb, 8);
118  if (skip_1stop_8data_bits(&gb) < 0)
119  return AVERROR_INVALIDDATA;
120  }
121  macroblock_offset = get_bits_count(&gb);
122 
123  /* Fill in VASliceParameterBufferMPEG2 */
124  slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(vactx, buffer, size);
125  if (!slice_param)
126  return -1;
127  slice_param->macroblock_offset = macroblock_offset;
128  slice_param->slice_horizontal_position = s->mb_x;
129  slice_param->slice_vertical_position = s->mb_y >> (s->picture_structure != PICT_FRAME);
130  slice_param->quantiser_scale_code = quantiser_scale_code;
131  slice_param->intra_slice_flag = intra_slice_flag;
132  return 0;
133 }
134 
136  .name = "mpeg2_vaapi",
137  .type = AVMEDIA_TYPE_VIDEO,
139  .pix_fmt = AV_PIX_FMT_VAAPI,
140  .start_frame = vaapi_mpeg2_start_frame,
141  .end_frame = ff_vaapi_mpeg_end_frame,
142  .decode_slice = vaapi_mpeg2_decode_slice,
143  .init = ff_vaapi_context_init,
144  .uninit = ff_vaapi_context_fini,
145  .priv_data_size = sizeof(FFVAContext),
146 };
VASliceParameterBufferBase * ff_vaapi_alloc_slice(FFVAContext *vactx, const uint8_t *buffer, uint32_t size)
Allocate a new slice descriptor for the input slice.
Definition: vaapi.c:178
IDCTDSPContext idsp
Definition: mpegvideo.h:227
int ff_vaapi_context_fini(AVCodecContext *avctx)
Common AVHWAccel.uninit() implementation.
Definition: vaapi.c:66
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:247
uint16_t chroma_intra_matrix[64]
Definition: mpegvideo.h:301
uint16_t chroma_inter_matrix[64]
Definition: mpegvideo.h:303
mpegvideo header.
uint8_t
unsigned int slice_param_size
Size of a slice parameter element.
static int mpeg2_get_f_code(MpegEncContext *s)
Reconstruct bitstream f_code.
Definition: vaapi_mpeg2.c:29
int intra_dc_precision
Definition: mpegvideo.h:460
int repeat_first_field
Definition: mpegvideo.h:469
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
void * ff_vaapi_alloc_iq_matrix(FFVAContext *vactx, unsigned int size)
Allocate a new IQ matrix buffer.
Definition: vaapi.c:168
static FFVAContext * ff_vaapi_get_context(AVCodecContext *avctx)
Extract vaapi_context from an AVCodecContext.
ptrdiff_t size
Definition: opengl_enc.c:101
int ff_vaapi_context_init(AVCodecContext *avctx)
Common AVHWAccel.init() implementation.
Definition: vaapi.c:45
GetBitContext gb
Definition: mpegvideo.h:445
static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
Definition: vaapi_mpeg2.c:41
int intra_vlc_format
Definition: mpegvideo.h:466
int progressive_frame
Definition: mpegvideo.h:478
int top_field_first
Definition: mpegvideo.h:462
const char * name
Name of the hardware accelerated codec.
Definition: avcodec.h:3699
int alternate_scan
Definition: mpegvideo.h:467
static VASurfaceID ff_vaapi_get_surface_id(AVFrame *pic)
Extract VASurfaceID from an AVFrame.
int n
Definition: avisynth_c.h:684
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
int mpeg_f_code[2][2]
Definition: mpegvideo.h:454
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:196
int first_field
is 1 for the first field of a field picture 0 otherwise
Definition: mpegvideo.h:481
int frame_pred_frame_dct
Definition: mpegvideo.h:461
uint16_t inter_matrix[64]
Definition: mpegvideo.h:302
int concealment_motion_vectors
Definition: mpegvideo.h:463
main external API structure.
Definition: avcodec.h:1659
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:97
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
AVHWAccel ff_mpeg2_vaapi_hwaccel
Definition: vaapi_mpeg2.c:135
static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
Definition: vaapi_mpeg2.c:102
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:292
struct AVFrame * f
Definition: mpegpicture.h:46
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:406
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:332
void * ff_vaapi_alloc_pic_param(FFVAContext *vactx, unsigned int size)
Allocate a new picture parameter buffer.
Definition: vaapi.c:163
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:209
static int mpeg2_get_is_frame_start(MpegEncContext *s)
Determine frame start: first field for field picture or frame picture.
Definition: vaapi_mpeg2.c:36
MpegEncContext.
Definition: mpegvideo.h:78
struct AVCodecContext * avctx
Definition: mpegvideo.h:95
common internal api header.
Picture last_picture
copy of the previous picture structure.
Definition: mpegvideo.h:159
Bi-dir predicted.
Definition: avutil.h:270
void * priv_data
Definition: avcodec.h:1701
#define PICT_FRAME
Definition: mpegutils.h:39
int picture_structure
Definition: mpegvideo.h:457
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:165
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:300
int ff_vaapi_mpeg_end_frame(AVCodecContext *avctx)
static int skip_1stop_8data_bits(GetBitContext *gb)
Definition: get_bits.h:573
Predicted.
Definition: avutil.h:269
GLuint buffer
Definition: opengl_enc.c:102
#define av_unused
Definition: attributes.h:126