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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 "vaapi_internal.h"
25 #include "internal.h"
26 
27 /** Reconstruct bitstream f_code */
28 static inline int mpeg2_get_f_code(MpegEncContext *s)
29 {
30  return (s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) |
31  (s->mpeg_f_code[1][0] << 4) | s->mpeg_f_code[1][1];
32 }
33 
34 /** Determine frame start: first field for field picture or frame picture */
36 {
37  return s->first_field || s->picture_structure == PICT_FRAME;
38 }
39 
41 {
42  struct MpegEncContext * const s = avctx->priv_data;
43  FFVAContext * const vactx = ff_vaapi_get_context(avctx);
44  VAPictureParameterBufferMPEG2 *pic_param;
45  VAIQMatrixBufferMPEG2 *iq_matrix;
46  int i;
47 
48  ff_dlog(avctx, "vaapi_mpeg2_start_frame()\n");
49 
50  vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG2);
51 
52  /* Fill in VAPictureParameterBufferMPEG2 */
53  pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG2));
54  if (!pic_param)
55  return -1;
56  pic_param->horizontal_size = s->width;
57  pic_param->vertical_size = s->height;
58  pic_param->forward_reference_picture = VA_INVALID_ID;
59  pic_param->backward_reference_picture = VA_INVALID_ID;
60  pic_param->picture_coding_type = s->pict_type;
61  pic_param->f_code = mpeg2_get_f_code(s);
62  pic_param->picture_coding_extension.value = 0; /* reset all bits */
63  pic_param->picture_coding_extension.bits.intra_dc_precision = s->intra_dc_precision;
64  pic_param->picture_coding_extension.bits.picture_structure = s->picture_structure;
65  pic_param->picture_coding_extension.bits.top_field_first = s->top_field_first;
66  pic_param->picture_coding_extension.bits.frame_pred_frame_dct = s->frame_pred_frame_dct;
67  pic_param->picture_coding_extension.bits.concealment_motion_vectors = s->concealment_motion_vectors;
68  pic_param->picture_coding_extension.bits.q_scale_type = s->q_scale_type;
69  pic_param->picture_coding_extension.bits.intra_vlc_format = s->intra_vlc_format;
70  pic_param->picture_coding_extension.bits.alternate_scan = s->alternate_scan;
71  pic_param->picture_coding_extension.bits.repeat_first_field = s->repeat_first_field;
72  pic_param->picture_coding_extension.bits.progressive_frame = s->progressive_frame;
73  pic_param->picture_coding_extension.bits.is_first_field = mpeg2_get_is_frame_start(s);
74 
75  switch (s->pict_type) {
76  case AV_PICTURE_TYPE_B:
77  pic_param->backward_reference_picture = ff_vaapi_get_surface_id(s->next_picture.f);
78  // fall-through
79  case AV_PICTURE_TYPE_P:
80  pic_param->forward_reference_picture = ff_vaapi_get_surface_id(s->last_picture.f);
81  break;
82  }
83 
84  /* Fill in VAIQMatrixBufferMPEG2 */
85  iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG2));
86  if (!iq_matrix)
87  return -1;
88  iq_matrix->load_intra_quantiser_matrix = 1;
89  iq_matrix->load_non_intra_quantiser_matrix = 1;
90  iq_matrix->load_chroma_intra_quantiser_matrix = 1;
91  iq_matrix->load_chroma_non_intra_quantiser_matrix = 1;
92 
93  for (i = 0; i < 64; i++) {
95  iq_matrix->intra_quantiser_matrix[i] = s->intra_matrix[n];
96  iq_matrix->non_intra_quantiser_matrix[i] = s->inter_matrix[n];
97  iq_matrix->chroma_intra_quantiser_matrix[i] = s->chroma_intra_matrix[n];
98  iq_matrix->chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n];
99  }
100  return 0;
101 }
102 
104 {
105  MpegEncContext * const s = avctx->priv_data;
106  FFVAContext * const vactx = ff_vaapi_get_context(avctx);
107  VASliceParameterBufferMPEG2 *slice_param;
109  uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset;
110 
111  ff_dlog(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size);
112 
113  /* Determine macroblock_offset */
114  init_get_bits(&gb, buffer, 8 * size);
115  if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */
116  return AVERROR_INVALIDDATA;
117  quantiser_scale_code = get_bits(&gb, 5);
118  intra_slice_flag = get_bits1(&gb);
119  if (intra_slice_flag) {
120  skip_bits(&gb, 8);
121  if (skip_1stop_8data_bits(&gb) < 0)
122  return AVERROR_INVALIDDATA;
123  }
124  macroblock_offset = get_bits_count(&gb);
125 
126  /* Fill in VASliceParameterBufferMPEG2 */
127  slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(vactx, buffer, size);
128  if (!slice_param)
129  return -1;
130  slice_param->macroblock_offset = macroblock_offset;
131  slice_param->slice_horizontal_position = s->mb_x;
132  slice_param->slice_vertical_position = s->mb_y >> (s->picture_structure != PICT_FRAME);
133  slice_param->quantiser_scale_code = quantiser_scale_code;
134  slice_param->intra_slice_flag = intra_slice_flag;
135  return 0;
136 }
137 
139  .name = "mpeg2_vaapi",
140  .type = AVMEDIA_TYPE_VIDEO,
142  .pix_fmt = AV_PIX_FMT_VAAPI,
143  .start_frame = vaapi_mpeg2_start_frame,
144  .end_frame = ff_vaapi_mpeg_end_frame,
145  .decode_slice = vaapi_mpeg2_decode_slice,
146  .init = ff_vaapi_context_init,
147  .uninit = ff_vaapi_context_fini,
148  .priv_data_size = sizeof(FFVAContext),
149 };
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:177
IDCTDSPContext idsp
Definition: mpegvideo.h:237
int ff_vaapi_context_fini(AVCodecContext *avctx)
Common AVHWAccel.uninit() implementation.
Definition: vaapi.c:65
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:309
uint16_t chroma_inter_matrix[64]
Definition: mpegvideo.h:311
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:28
int intra_dc_precision
Definition: mpegvideo.h:465
int repeat_first_field
Definition: mpegvideo.h:473
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:167
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:44
GetBitContext gb
Definition: mpegvideo.h:451
static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
Definition: vaapi_mpeg2.c:40
int intra_vlc_format
Definition: mpegvideo.h:470
int progressive_frame
Definition: mpegvideo.h:482
int top_field_first
Definition: mpegvideo.h:467
const char * name
Name of the hardware accelerated codec.
Definition: avcodec.h:3583
int alternate_scan
Definition: mpegvideo.h:471
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:460
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:107
int first_field
is 1 for the first field of a field picture 0 otherwise
Definition: mpegvideo.h:485
int frame_pred_frame_dct
Definition: mpegvideo.h:466
uint16_t inter_matrix[64]
Definition: mpegvideo.h:310
int concealment_motion_vectors
Definition: mpegvideo.h:468
main external API structure.
Definition: avcodec.h:1502
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:107
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:304
AVHWAccel ff_mpeg2_vaapi_hwaccel
Definition: vaapi_mpeg2.c:138
static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
Definition: vaapi_mpeg2.c:103
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:297
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:410
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:337
void * ff_vaapi_alloc_pic_param(FFVAContext *vactx, unsigned int size)
Allocate a new picture parameter buffer.
Definition: vaapi.c:162
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:219
static int mpeg2_get_is_frame_start(MpegEncContext *s)
Determine frame start: first field for field picture or frame picture.
Definition: vaapi_mpeg2.c:35
MpegEncContext.
Definition: mpegvideo.h:88
struct AVCodecContext * avctx
Definition: mpegvideo.h:105
common internal api header.
Picture last_picture
copy of the previous picture structure.
Definition: mpegvideo.h:169
Bi-dir predicted.
Definition: avutil.h:268
void * priv_data
Definition: avcodec.h:1544
#define PICT_FRAME
Definition: mpegutils.h:35
int picture_structure
Definition: mpegvideo.h:463
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:175
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:308
int ff_vaapi_mpeg_end_frame(AVCodecContext *avctx)
static int skip_1stop_8data_bits(GetBitContext *gb)
Definition: get_bits.h:593
Predicted.
Definition: avutil.h:267
GLuint buffer
Definition: opengl_enc.c:102
#define av_unused
Definition: attributes.h:118