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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  ff_dlog(avctx, "vaapi_mpeg2_start_frame()\n");
50 
51  vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG2);
52 
53  /* Fill in VAPictureParameterBufferMPEG2 */
54  pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG2));
55  if (!pic_param)
56  return -1;
57  pic_param->horizontal_size = s->width;
58  pic_param->vertical_size = s->height;
59  pic_param->forward_reference_picture = VA_INVALID_ID;
60  pic_param->backward_reference_picture = VA_INVALID_ID;
61  pic_param->picture_coding_type = s->pict_type;
62  pic_param->f_code = mpeg2_get_f_code(s);
63  pic_param->picture_coding_extension.value = 0; /* reset all bits */
64  pic_param->picture_coding_extension.bits.intra_dc_precision = s->intra_dc_precision;
65  pic_param->picture_coding_extension.bits.picture_structure = s->picture_structure;
66  pic_param->picture_coding_extension.bits.top_field_first = s->top_field_first;
67  pic_param->picture_coding_extension.bits.frame_pred_frame_dct = s->frame_pred_frame_dct;
68  pic_param->picture_coding_extension.bits.concealment_motion_vectors = s->concealment_motion_vectors;
69  pic_param->picture_coding_extension.bits.q_scale_type = s->q_scale_type;
70  pic_param->picture_coding_extension.bits.intra_vlc_format = s->intra_vlc_format;
71  pic_param->picture_coding_extension.bits.alternate_scan = s->alternate_scan;
72  pic_param->picture_coding_extension.bits.repeat_first_field = s->repeat_first_field;
73  pic_param->picture_coding_extension.bits.progressive_frame = s->progressive_frame;
74  pic_param->picture_coding_extension.bits.is_first_field = mpeg2_get_is_frame_start(s);
75 
76  switch (s->pict_type) {
77  case AV_PICTURE_TYPE_B:
78  pic_param->backward_reference_picture = ff_vaapi_get_surface_id(s->next_picture.f);
79  // fall-through
80  case AV_PICTURE_TYPE_P:
81  pic_param->forward_reference_picture = ff_vaapi_get_surface_id(s->last_picture.f);
82  break;
83  }
84 
85  /* Fill in VAIQMatrixBufferMPEG2 */
86  iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG2));
87  if (!iq_matrix)
88  return -1;
89  iq_matrix->load_intra_quantiser_matrix = 1;
90  iq_matrix->load_non_intra_quantiser_matrix = 1;
91  iq_matrix->load_chroma_intra_quantiser_matrix = 1;
92  iq_matrix->load_chroma_non_intra_quantiser_matrix = 1;
93 
94  for (i = 0; i < 64; i++) {
96  iq_matrix->intra_quantiser_matrix[i] = s->intra_matrix[n];
97  iq_matrix->non_intra_quantiser_matrix[i] = s->inter_matrix[n];
98  iq_matrix->chroma_intra_quantiser_matrix[i] = s->chroma_intra_matrix[n];
99  iq_matrix->chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n];
100  }
101  return 0;
102 }
103 
105 {
106  MpegEncContext * const s = avctx->priv_data;
107  FFVAContext * const vactx = ff_vaapi_get_context(avctx);
108  VASliceParameterBufferMPEG2 *slice_param;
110  uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset;
111 
112  ff_dlog(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size);
113 
114  /* Determine macroblock_offset */
115  init_get_bits(&gb, buffer, 8 * size);
116  if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */
117  return AVERROR_INVALIDDATA;
118  quantiser_scale_code = get_bits(&gb, 5);
119  intra_slice_flag = get_bits1(&gb);
120  if (intra_slice_flag) {
121  skip_bits(&gb, 8);
122  if (skip_1stop_8data_bits(&gb) < 0)
123  return AVERROR_INVALIDDATA;
124  }
125  macroblock_offset = get_bits_count(&gb);
126 
127  /* Fill in VASliceParameterBufferMPEG2 */
128  slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(vactx, buffer, size);
129  if (!slice_param)
130  return -1;
131  slice_param->macroblock_offset = macroblock_offset;
132  slice_param->slice_horizontal_position = s->mb_x;
133  slice_param->slice_vertical_position = s->mb_y >> (s->picture_structure != PICT_FRAME);
134  slice_param->quantiser_scale_code = quantiser_scale_code;
135  slice_param->intra_slice_flag = intra_slice_flag;
136  return 0;
137 }
138 
140  .name = "mpeg2_vaapi",
141  .type = AVMEDIA_TYPE_VIDEO,
143  .pix_fmt = AV_PIX_FMT_VAAPI,
144  .start_frame = vaapi_mpeg2_start_frame,
145  .end_frame = ff_vaapi_mpeg_end_frame,
146  .decode_slice = vaapi_mpeg2_decode_slice,
147  .init = ff_vaapi_context_init,
148  .uninit = ff_vaapi_context_fini,
149  .priv_data_size = sizeof(FFVAContext),
150 };
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:631
#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:260
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:212
#define ff_dlog(a,...)
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:3661
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:547
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:194
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:1642
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:312
AVHWAccel ff_mpeg2_vaapi_hwaccel
Definition: vaapi_mpeg2.c:139
static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
Definition: vaapi_mpeg2.c:104
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:305
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:418
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:345
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:268
void * priv_data
Definition: avcodec.h:1684
#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:612
Predicted.
Definition: avutil.h:267
GLuint buffer
Definition: opengl_enc.c:102
#define av_unused
Definition: attributes.h:126