FFmpeg
mpegutils.c
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1 /*
2  * Mpeg video formats-related defines and utility functions
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <stdint.h>
22 
23 #include "libavutil/common.h"
24 #include "libavutil/frame.h"
25 #include "libavutil/pixdesc.h"
27 #include "libavutil/avassert.h"
28 
29 #include "avcodec.h"
30 #include "mpegutils.h"
31 
32 static int add_mb(AVMotionVector *mb, uint32_t mb_type,
33  int dst_x, int dst_y,
34  int motion_x, int motion_y, int motion_scale,
35  int direction)
36 {
37  mb->w = IS_8X8(mb_type) || IS_8X16(mb_type) ? 8 : 16;
38  mb->h = IS_8X8(mb_type) || IS_16X8(mb_type) ? 8 : 16;
39  mb->motion_x = motion_x;
40  mb->motion_y = motion_y;
41  mb->motion_scale = motion_scale;
42  mb->dst_x = dst_x;
43  mb->dst_y = dst_y;
44  mb->src_x = dst_x + motion_x / motion_scale;
45  mb->src_y = dst_y + motion_y / motion_scale;
46  mb->source = direction ? 1 : -1;
47  mb->flags = 0; // XXX: does mb_type contain extra information that could be exported here?
48  return 1;
49 }
50 
52  const AVFrame *cur, const AVFrame *last,
53  int y, int h, int picture_structure,
54  int first_field, int low_delay)
55 {
56  const int field_pic = picture_structure != PICT_FRAME;
57  const AVFrame *src;
59 
60  if (!avctx->draw_horiz_band)
61  return;
62 
63  if (field_pic) {
64  h <<= 1;
65  y <<= 1;
66  }
67 
68  h = FFMIN(h, avctx->height - y);
69 
70  if (field_pic && first_field &&
72  return;
73 
74  if (cur->pict_type == AV_PICTURE_TYPE_B || low_delay ||
76  src = cur;
77  else if (last)
78  src = last;
79  else
80  return;
81 
82  if (cur->pict_type == AV_PICTURE_TYPE_B &&
83  picture_structure == PICT_FRAME &&
84  avctx->codec_id != AV_CODEC_ID_SVQ3) {
85  for (int i = 0; i < AV_NUM_DATA_POINTERS; i++)
86  offset[i] = 0;
87  } else {
89  int vshift = desc->log2_chroma_h;
90 
91  offset[0] = y * src->linesize[0];
92  offset[1] =
93  offset[2] = (y >> vshift) * src->linesize[1];
94  for (int i = 3; i < AV_NUM_DATA_POINTERS; i++)
95  offset[i] = 0;
96  }
97 
98  emms_c();
99 
100  avctx->draw_horiz_band(avctx, src, offset,
101  y, picture_structure, h);
102 }
103 
104 static char get_type_mv_char(int mb_type)
105 {
106  // Type & MV direction
107  if (IS_PCM(mb_type))
108  return 'P';
109  else if (IS_INTRA(mb_type) && IS_ACPRED(mb_type))
110  return 'A';
111  else if (IS_INTRA4x4(mb_type))
112  return 'i';
113  else if (IS_INTRA16x16(mb_type))
114  return 'I';
115  else if (IS_DIRECT(mb_type) && IS_SKIP(mb_type))
116  return 'd';
117  else if (IS_DIRECT(mb_type))
118  return 'D';
119  else if (IS_GMC(mb_type) && IS_SKIP(mb_type))
120  return 'g';
121  else if (IS_GMC(mb_type))
122  return 'G';
123  else if (IS_SKIP(mb_type))
124  return 'S';
125  else if (!USES_LIST(mb_type, 1))
126  return '>';
127  else if (!USES_LIST(mb_type, 0))
128  return '<';
129  else {
130  av_assert2(USES_LIST(mb_type, 0) && USES_LIST(mb_type, 1));
131  return 'X';
132  }
133 }
134 
135 static char get_segmentation_char(int mb_type)
136 {
137  if (IS_8X8(mb_type))
138  return '+';
139  else if (IS_16X8(mb_type))
140  return '-';
141  else if (IS_8X16(mb_type))
142  return '|';
143  else if (IS_INTRA(mb_type) || IS_16X16(mb_type))
144  return ' ';
145 
146  return '?';
147 }
148 
149 static char get_interlacement_char(int mb_type)
150 {
151  if (IS_INTERLACED(mb_type))
152  return '=';
153  else
154  return ' ';
155 }
156 
158  const uint8_t *mbskip_table, const uint32_t *mbtype_table,
159  const int8_t *qscale_table, int16_t (*const motion_val[2])[2],
160  int mb_width, int mb_height, int mb_stride, int quarter_sample)
161 {
162  if ((avctx->export_side_data & AV_CODEC_EXPORT_DATA_MVS) && mbtype_table && motion_val[0]) {
163  const int shift = 1 + quarter_sample;
164  const int scale = 1 << shift;
165  const int mv_sample_log2 = avctx->codec_id == AV_CODEC_ID_H264 || avctx->codec_id == AV_CODEC_ID_SVQ3 ? 2 : 1;
166  const int mv_stride = (mb_width << mv_sample_log2) +
167  (avctx->codec->id == AV_CODEC_ID_H264 ? 0 : 1);
168  int mb_x, mb_y, mbcount = 0;
169 
170  /* size is width * height * 2 * 4 where 2 is for directions and 4 is
171  * for the maximum number of MB (4 MB in case of IS_8x8) */
172  AVMotionVector *mvs = av_malloc_array(mb_width * mb_height, 2 * 4 * sizeof(AVMotionVector));
173  if (!mvs)
174  return;
175 
176  for (mb_y = 0; mb_y < mb_height; mb_y++) {
177  for (mb_x = 0; mb_x < mb_width; mb_x++) {
178  int i, direction, mb_type = mbtype_table[mb_x + mb_y * mb_stride];
179  for (direction = 0; direction < 2; direction++) {
180  if (!USES_LIST(mb_type, direction))
181  continue;
182  if (IS_8X8(mb_type)) {
183  for (i = 0; i < 4; i++) {
184  int sx = mb_x * 16 + 4 + 8 * (i & 1);
185  int sy = mb_y * 16 + 4 + 8 * (i >> 1);
186  int xy = (mb_x * 2 + (i & 1) +
187  (mb_y * 2 + (i >> 1)) * mv_stride) << (mv_sample_log2 - 1);
188  int mx = motion_val[direction][xy][0];
189  int my = motion_val[direction][xy][1];
190  mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
191  }
192  } else if (IS_16X8(mb_type)) {
193  for (i = 0; i < 2; i++) {
194  int sx = mb_x * 16 + 8;
195  int sy = mb_y * 16 + 4 + 8 * i;
196  int xy = (mb_x * 2 + (mb_y * 2 + i) * mv_stride) << (mv_sample_log2 - 1);
197  int mx = motion_val[direction][xy][0];
198  int my = motion_val[direction][xy][1];
199 
200  if (IS_INTERLACED(mb_type))
201  my *= 2;
202 
203  mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
204  }
205  } else if (IS_8X16(mb_type)) {
206  for (i = 0; i < 2; i++) {
207  int sx = mb_x * 16 + 4 + 8 * i;
208  int sy = mb_y * 16 + 8;
209  int xy = (mb_x * 2 + i + mb_y * 2 * mv_stride) << (mv_sample_log2 - 1);
210  int mx = motion_val[direction][xy][0];
211  int my = motion_val[direction][xy][1];
212 
213  if (IS_INTERLACED(mb_type))
214  my *= 2;
215 
216  mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
217  }
218  } else {
219  int sx = mb_x * 16 + 8;
220  int sy = mb_y * 16 + 8;
221  int xy = (mb_x + mb_y * mv_stride) << mv_sample_log2;
222  int mx = motion_val[direction][xy][0];
223  int my = motion_val[direction][xy][1];
224  mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
225  }
226  }
227  }
228  }
229 
230  if (mbcount) {
231  AVFrameSideData *sd;
232 
233  av_log(avctx, AV_LOG_DEBUG, "Adding %d MVs info to frame %d\n", mbcount, avctx->frame_number);
235  if (!sd) {
236  av_freep(&mvs);
237  return;
238  }
239  memcpy(sd->data, mvs, mbcount * sizeof(AVMotionVector));
240  }
241 
242  av_freep(&mvs);
243  }
244 
245  /* TODO: export all the following to make them accessible for users (and filters) */
246  if (avctx->hwaccel || !mbtype_table)
247  return;
248 
249 
250  if (avctx->debug & (FF_DEBUG_SKIP | FF_DEBUG_QP | FF_DEBUG_MB_TYPE)) {
251  int x,y;
252 
253  av_log(avctx, AV_LOG_DEBUG, "New frame, type: %c\n",
255  for (y = 0; y < mb_height; y++) {
256  for (x = 0; x < mb_width; x++) {
257  if (avctx->debug & FF_DEBUG_SKIP) {
258  int count = mbskip_table ? mbskip_table[x + y * mb_stride] : 0;
259  if (count > 9)
260  count = 9;
261  av_log(avctx, AV_LOG_DEBUG, "%1d", count);
262  }
263  if (avctx->debug & FF_DEBUG_QP) {
264  av_log(avctx, AV_LOG_DEBUG, "%2d",
265  qscale_table[x + y * mb_stride]);
266  }
267  if (avctx->debug & FF_DEBUG_MB_TYPE) {
268  int mb_type = mbtype_table[x + y * mb_stride];
269 
270  av_log(avctx, AV_LOG_DEBUG, "%c%c%c",
271  get_type_mv_char(mb_type),
272  get_segmentation_char(mb_type),
273  get_interlacement_char(mb_type));
274  }
275  }
276  av_log(avctx, AV_LOG_DEBUG, "\n");
277  }
278  }
279 }
PICT_FRAME
#define PICT_FRAME
Definition: mpegutils.h:38
IS_INTRA4x4
#define IS_INTRA4x4(a)
Definition: mpegutils.h:68
ff_draw_horiz_band
void ff_draw_horiz_band(AVCodecContext *avctx, const AVFrame *cur, const AVFrame *last, int y, int h, int picture_structure, int first_field, int low_delay)
Draw a horizontal band if supported.
Definition: mpegutils.c:51
AVCodecContext::hwaccel
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1416
IS_8X8
#define IS_8X8(a)
Definition: mpegutils.h:82
IS_GMC
#define IS_GMC(a)
Definition: mpegutils.h:78
IS_ACPRED
#define IS_ACPRED(a)
Definition: mpegutils.h:87
av_frame_new_side_data
AVFrameSideData * av_frame_new_side_data(AVFrame *frame, enum AVFrameSideDataType type, size_t size)
Add a new side data to a frame.
Definition: frame.c:683
SLICE_FLAG_CODED_ORDER
#define SLICE_FLAG_CODED_ORDER
draw_horiz_band() is called in coded order instead of display
Definition: avcodec.h:904
AVMotionVector
Definition: motion_vector.h:24
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2888
SLICE_FLAG_ALLOW_FIELD
#define SLICE_FLAG_ALLOW_FIELD
allow draw_horiz_band() with field slices (MPEG-2 field pics)
Definition: avcodec.h:905
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:330
pixdesc.h
mpegutils.h
AVCodecContext::codec
const struct AVCodec * codec
Definition: avcodec.h:449
USES_LIST
#define USES_LIST(a, list)
Definition: mpegutils.h:92
scale
static av_always_inline float scale(float x, float s)
Definition: vf_v360.c:1389
avassert.h
motion_vector.h
IS_16X8
#define IS_16X8(a)
Definition: mpegutils.h:80
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
IS_SKIP
#define IS_SKIP(a)
Definition: mpegutils.h:74
IS_INTRA
#define IS_INTRA(x, y)
AV_CODEC_ID_SVQ3
@ AV_CODEC_ID_SVQ3
Definition: codec_id.h:75
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:79
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:450
AVCodecContext::slice_flags
int slice_flags
slice flags
Definition: avcodec.h:903
get_type_mv_char
static char get_type_mv_char(int mb_type)
Definition: mpegutils.c:104
FF_DEBUG_MB_TYPE
#define FF_DEBUG_MB_TYPE
Definition: avcodec.h:1373
IS_INTERLACED
#define IS_INTERLACED(a)
Definition: mpegutils.h:76
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:427
shift
static int shift(int a, int b)
Definition: bonk.c:257
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
AV_NUM_DATA_POINTERS
#define AV_NUM_DATA_POINTERS
Definition: frame.h:331
get_interlacement_char
static char get_interlacement_char(int mb_type)
Definition: mpegutils.c:149
AVFrameSideData::data
uint8_t * data
Definition: frame.h:238
frame.h
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
IS_INTRA16x16
#define IS_INTRA16x16(a)
Definition: mpegutils.h:69
mb
#define mb
Definition: vf_colormatrix.c:101
IS_DIRECT
#define IS_DIRECT(a)
Definition: mpegutils.h:77
IS_16X16
#define IS_16X16(a)
Definition: mpegutils.h:79
AVCodec::id
enum AVCodecID id
Definition: codec.h:218
av_get_picture_type_char
char av_get_picture_type_char(enum AVPictureType pict_type)
Return a single letter to describe the given picture type pict_type.
Definition: utils.c:40
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:31
FF_DEBUG_SKIP
#define FF_DEBUG_SKIP
Definition: avcodec.h:1376
common.h
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AVCodecContext::height
int height
Definition: avcodec.h:613
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:650
avcodec.h
FF_DEBUG_QP
#define FF_DEBUG_QP
Definition: avcodec.h:1374
AVCodecContext::draw_horiz_band
void(* draw_horiz_band)(struct AVCodecContext *s, const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], int y, int type, int height)
If non NULL, 'draw_horiz_band' is called by the libavcodec decoder to draw a horizontal band.
Definition: avcodec.h:675
AVCodecContext
main external API structure.
Definition: avcodec.h:440
IS_PCM
#define IS_PCM(a)
Definition: mpegutils.h:70
AV_PICTURE_TYPE_B
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:276
AVCodecContext::export_side_data
int export_side_data
Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of metadata exported in frame,...
Definition: avcodec.h:2056
IS_8X16
#define IS_8X16(a)
Definition: mpegutils.h:81
AVCodecContext::debug
int debug
debug
Definition: avcodec.h:1369
desc
const char * desc
Definition: libsvtav1.c:83
AV_CODEC_EXPORT_DATA_MVS
#define AV_CODEC_EXPORT_DATA_MVS
Export motion vectors through frame side data.
Definition: avcodec.h:399
AVCodecContext::frame_number
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:1088
AVFrameSideData
Structure to hold side data for an AVFrame.
Definition: frame.h:236
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
add_mb
static int add_mb(AVMotionVector *mb, uint32_t mb_type, int dst_x, int dst_y, int motion_x, int motion_y, int motion_scale, int direction)
Definition: mpegutils.c:32
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AV_FRAME_DATA_MOTION_VECTORS
@ AV_FRAME_DATA_MOTION_VECTORS
Motion vectors exported by some codecs (on demand through the export_mvs flag set in the libavcodec A...
Definition: frame.h:97
h
h
Definition: vp9dsp_template.c:2038
get_segmentation_char
static char get_segmentation_char(int mb_type)
Definition: mpegutils.c:135
first_field
static int first_field(const struct video_data *s)
Definition: v4l2.c:246
ff_print_debug_info2
void ff_print_debug_info2(AVCodecContext *avctx, AVFrame *pict, const uint8_t *mbskip_table, const uint32_t *mbtype_table, const int8_t *qscale_table, int16_t(*const motion_val[2])[2], int mb_width, int mb_height, int mb_stride, int quarter_sample)
Print debugging info for the given picture.
Definition: mpegutils.c:157