FFmpeg  2.1.1
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 "vaapi_internal.h"
24 
25 /** Reconstruct bitstream f_code */
26 static inline int mpeg2_get_f_code(MpegEncContext *s)
27 {
28  return (s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) |
29  (s->mpeg_f_code[1][0] << 4) | s->mpeg_f_code[1][1];
30 }
31 
32 /** Determine frame start: first field for field picture or frame picture */
34 {
35  return s->first_field || s->picture_structure == PICT_FRAME;
36 }
37 
39 {
40  struct MpegEncContext * const s = avctx->priv_data;
41  struct vaapi_context * const vactx = avctx->hwaccel_context;
42  VAPictureParameterBufferMPEG2 *pic_param;
43  VAIQMatrixBufferMPEG2 *iq_matrix;
44  int i;
45 
46  av_dlog(avctx, "vaapi_mpeg2_start_frame()\n");
47 
48  vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG2);
49 
50  /* Fill in VAPictureParameterBufferMPEG2 */
51  pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG2));
52  if (!pic_param)
53  return -1;
54  pic_param->horizontal_size = s->width;
55  pic_param->vertical_size = s->height;
56  pic_param->forward_reference_picture = VA_INVALID_ID;
57  pic_param->backward_reference_picture = VA_INVALID_ID;
58  pic_param->picture_coding_type = s->pict_type;
59  pic_param->f_code = mpeg2_get_f_code(s);
60  pic_param->picture_coding_extension.value = 0; /* reset all bits */
61  pic_param->picture_coding_extension.bits.intra_dc_precision = s->intra_dc_precision;
62  pic_param->picture_coding_extension.bits.picture_structure = s->picture_structure;
63  pic_param->picture_coding_extension.bits.top_field_first = s->top_field_first;
64  pic_param->picture_coding_extension.bits.frame_pred_frame_dct = s->frame_pred_frame_dct;
65  pic_param->picture_coding_extension.bits.concealment_motion_vectors = s->concealment_motion_vectors;
66  pic_param->picture_coding_extension.bits.q_scale_type = s->q_scale_type;
67  pic_param->picture_coding_extension.bits.intra_vlc_format = s->intra_vlc_format;
68  pic_param->picture_coding_extension.bits.alternate_scan = s->alternate_scan;
69  pic_param->picture_coding_extension.bits.repeat_first_field = s->repeat_first_field;
70  pic_param->picture_coding_extension.bits.progressive_frame = s->progressive_frame;
71  pic_param->picture_coding_extension.bits.is_first_field = mpeg2_get_is_frame_start(s);
72 
73  switch (s->pict_type) {
74  case AV_PICTURE_TYPE_B:
75  pic_param->backward_reference_picture = ff_vaapi_get_surface_id(&s->next_picture);
76  // fall-through
77  case AV_PICTURE_TYPE_P:
78  pic_param->forward_reference_picture = ff_vaapi_get_surface_id(&s->last_picture);
79  break;
80  }
81 
82  /* Fill in VAIQMatrixBufferMPEG2 */
83  iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG2));
84  if (!iq_matrix)
85  return -1;
86  iq_matrix->load_intra_quantiser_matrix = 1;
87  iq_matrix->load_non_intra_quantiser_matrix = 1;
88  iq_matrix->load_chroma_intra_quantiser_matrix = 1;
89  iq_matrix->load_chroma_non_intra_quantiser_matrix = 1;
90 
91  for (i = 0; i < 64; i++) {
93  iq_matrix->intra_quantiser_matrix[i] = s->intra_matrix[n];
94  iq_matrix->non_intra_quantiser_matrix[i] = s->inter_matrix[n];
95  iq_matrix->chroma_intra_quantiser_matrix[i] = s->chroma_intra_matrix[n];
96  iq_matrix->chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n];
97  }
98  return 0;
99 }
100 
101 static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
102 {
103  MpegEncContext * const s = avctx->priv_data;
104  VASliceParameterBufferMPEG2 *slice_param;
105  GetBitContext gb;
106  uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset;
107 
108  av_dlog(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size);
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  while (get_bits1(&gb) != 0)
119  skip_bits(&gb, 8);
120  }
121  macroblock_offset = get_bits_count(&gb);
122 
123  /* Fill in VASliceParameterBufferMPEG2 */
124  slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, 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_VLD,
140  .start_frame = vaapi_mpeg2_start_frame,
141  .end_frame = ff_vaapi_mpeg_end_frame,
142  .decode_slice = vaapi_mpeg2_decode_slice,
143 };
const char * s
Definition: avisynth_c.h:668
int size
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:255
uint16_t chroma_intra_matrix[64]
Definition: mpegvideo.h:477
uint16_t chroma_inter_matrix[64]
Definition: mpegvideo.h:479
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
This structure is used to share data between the FFmpeg library and the client video application...
Definition: vaapi.h:50
Predicted.
Definition: avcodec.h:2305
uint8_t
#define PICT_FRAME
Definition: mpegvideo.h:669
static int mpeg2_get_f_code(MpegEncContext *s)
Reconstruct bitstream f_code.
Definition: vaapi_mpeg2.c:26
int intra_dc_precision
Definition: mpegvideo.h:671
int repeat_first_field
Definition: mpegvideo.h:678
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:207
uint8_t idct_permutation[64]
idct input permutation.
Definition: dsputil.h:246
void * ff_vaapi_alloc_pic_param(struct vaapi_context *vactx, unsigned int size)
Allocate a new picture parameter buffer.
Definition: vaapi.c:136
#define av_unused
Disable warnings about deprecated features This is useful for sections of code kept for backward comp...
Definition: avcodec.h:697
static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
Definition: vaapi_mpeg2.c:38
int intra_vlc_format
Definition: mpegvideo.h:676
int progressive_frame
Definition: mpegvideo.h:687
int top_field_first
Definition: mpegvideo.h:673
int alternate_scan
Definition: mpegvideo.h:677
unsigned int slice_param_size
Size of a VASliceParameterBuffer element.
Definition: vaapi.h:137
static char buffer[20]
Definition: seek-test.c:31
int n
Definition: avisynth_c.h:588
int mpeg_f_code[2][2]
Definition: mpegvideo.h:664
const char * name
Name of the hardware accelerated codec.
Definition: avcodec.h:3027
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:691
int frame_pred_frame_dct
Definition: mpegvideo.h:672
uint16_t inter_matrix[64]
Definition: mpegvideo.h:478
int concealment_motion_vectors
Definition: mpegvideo.h:674
void * hwaccel_context
Hardware accelerator context.
Definition: avcodec.h:2513
AVHWAccel.
Definition: avcodec.h:3021
main external API structure.
Definition: avcodec.h:1146
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:249
VASliceParameterBufferBase * ff_vaapi_alloc_slice(struct vaapi_context *vactx, const uint8_t *buffer, uint32_t size)
Allocate a new slice descriptor for the input slice.
Definition: vaapi.c:151
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:101
Bi-dir predicted.
Definition: avcodec.h:2306
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:292
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:405
DSPContext dsp
pointers for accelerated dsp functions
Definition: mpegvideo.h:395
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:332
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:381
void * priv_data
Definition: avcodec.h:1182
static int mpeg2_get_is_frame_start(MpegEncContext *s)
Determine frame start: first field for field picture or frame picture.
Definition: vaapi_mpeg2.c:33
HW decoding through VA API, Picture.data[3] contains a vaapi_render_state struct which contains the b...
Definition: avcodec.h:4594
MpegEncContext.
Definition: mpegvideo.h:245
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:115
Picture last_picture
copy of the previous picture structure.
Definition: mpegvideo.h:329
void * ff_vaapi_alloc_iq_matrix(struct vaapi_context *vactx, unsigned int size)
Allocate a new IQ matrix buffer.
Definition: vaapi.c:141
static VASurfaceID ff_vaapi_get_surface_id(Picture *pic)
Extract VASurfaceID from a Picture.
int picture_structure
Definition: mpegvideo.h:665
#define AVERROR_INVALIDDATA
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:335
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:476
int ff_vaapi_mpeg_end_frame(AVCodecContext *avctx)
Definition: vaapi_mpeg.c:27