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/bprint.h"
24 #include "libavutil/common.h"
25 #include "libavutil/emms.h"
26 #include "libavutil/frame.h"
27 #include "libavutil/mem.h"
28 #include "libavutil/pixdesc.h"
30 #include "libavutil/avassert.h"
31 
32 #include "avcodec.h"
33 #include "mpegutils.h"
34 
35 static int add_mb(AVMotionVector *mb, uint32_t mb_type,
36  int dst_x, int dst_y,
37  int motion_x, int motion_y, int motion_scale,
38  int direction)
39 {
40  mb->w = IS_8X8(mb_type) || IS_8X16(mb_type) ? 8 : 16;
41  mb->h = IS_8X8(mb_type) || IS_16X8(mb_type) ? 8 : 16;
42  mb->motion_x = motion_x;
43  mb->motion_y = motion_y;
44  mb->motion_scale = motion_scale;
45  mb->dst_x = dst_x;
46  mb->dst_y = dst_y;
47  mb->src_x = dst_x + motion_x / motion_scale;
48  mb->src_y = dst_y + motion_y / motion_scale;
49  mb->source = direction ? 1 : -1;
50  mb->flags = 0; // XXX: does mb_type contain extra information that could be exported here?
51  return 1;
52 }
53 
55  const AVFrame *cur, const AVFrame *last,
56  int y, int h, int picture_structure,
57  int first_field, int low_delay)
58 {
59  const int field_pic = picture_structure != PICT_FRAME;
60  const AVFrame *src;
62 
63  if (!avctx->draw_horiz_band)
64  return;
65 
66  if (field_pic) {
67  h <<= 1;
68  y <<= 1;
69  }
70 
71  h = FFMIN(h, avctx->height - y);
72 
73  if (field_pic && first_field &&
75  return;
76 
77  if (cur->pict_type == AV_PICTURE_TYPE_B || low_delay ||
79  src = cur;
80  else if (last)
81  src = last;
82  else
83  return;
84 
85  if (cur->pict_type == AV_PICTURE_TYPE_B &&
86  picture_structure == PICT_FRAME &&
87  avctx->codec_id != AV_CODEC_ID_SVQ3) {
88  for (int i = 0; i < AV_NUM_DATA_POINTERS; i++)
89  offset[i] = 0;
90  } else {
92  int vshift = desc->log2_chroma_h;
93 
94  offset[0] = y * src->linesize[0];
95  offset[1] =
96  offset[2] = (y >> vshift) * src->linesize[1];
97  for (int i = 3; i < AV_NUM_DATA_POINTERS; i++)
98  offset[i] = 0;
99  }
100 
101  emms_c();
102 
103  avctx->draw_horiz_band(avctx, src, offset,
104  y, picture_structure, h);
105 }
106 
107 static char get_type_mv_char(int mb_type)
108 {
109  // Type & MV direction
110  if (IS_PCM(mb_type))
111  return 'P';
112  else if (IS_INTRA(mb_type) && IS_ACPRED(mb_type))
113  return 'A';
114  else if (IS_INTRA4x4(mb_type))
115  return 'i';
116  else if (IS_INTRA16x16(mb_type))
117  return 'I';
118  else if (IS_DIRECT(mb_type) && IS_SKIP(mb_type))
119  return 'd';
120  else if (IS_DIRECT(mb_type))
121  return 'D';
122  else if (IS_GMC(mb_type) && IS_SKIP(mb_type))
123  return 'g';
124  else if (IS_GMC(mb_type))
125  return 'G';
126  else if (IS_SKIP(mb_type))
127  return 'S';
128  else if (!USES_LIST(mb_type, 1))
129  return '>';
130  else if (!USES_LIST(mb_type, 0))
131  return '<';
132  else {
133  av_assert2(USES_LIST(mb_type, 0) && USES_LIST(mb_type, 1));
134  return 'X';
135  }
136 }
137 
138 static char get_segmentation_char(int mb_type)
139 {
140  if (IS_8X8(mb_type))
141  return '+';
142  else if (IS_16X8(mb_type))
143  return '-';
144  else if (IS_8X16(mb_type))
145  return '|';
146  else if (IS_INTRA(mb_type) || IS_16X16(mb_type))
147  return ' ';
148 
149  return '?';
150 }
151 
152 static char get_interlacement_char(int mb_type)
153 {
154  if (IS_INTERLACED(mb_type))
155  return '=';
156  else
157  return ' ';
158 }
159 
161  const uint8_t *mbskip_table, const uint32_t *mbtype_table,
162  const int8_t *qscale_table, int16_t (*const motion_val[2])[2],
163  int mb_width, int mb_height, int mb_stride, int quarter_sample)
164 {
165  if ((avctx->export_side_data & AV_CODEC_EXPORT_DATA_MVS) && mbtype_table && motion_val[0]) {
166  const int shift = 1 + quarter_sample;
167  const int scale = 1 << shift;
168  const int mv_sample_log2 = avctx->codec_id == AV_CODEC_ID_H264 || avctx->codec_id == AV_CODEC_ID_SVQ3 ? 2 : 1;
169  const int mv_stride = (mb_width << mv_sample_log2) +
170  (avctx->codec->id == AV_CODEC_ID_H264 ? 0 : 1);
171  int mb_x, mb_y, mbcount = 0;
172 
173  /* size is width * height * 2 * 4 where 2 is for directions and 4 is
174  * for the maximum number of MB (4 MB in case of IS_8x8) */
175  AVMotionVector *mvs = av_malloc_array(mb_width * mb_height, 2 * 4 * sizeof(AVMotionVector));
176  if (!mvs)
177  return;
178 
179  for (mb_y = 0; mb_y < mb_height; mb_y++) {
180  for (mb_x = 0; mb_x < mb_width; mb_x++) {
181  int i, direction, mb_type = mbtype_table[mb_x + mb_y * mb_stride];
182  for (direction = 0; direction < 2; direction++) {
183  if (!USES_LIST(mb_type, direction))
184  continue;
185  if (IS_8X8(mb_type)) {
186  for (i = 0; i < 4; i++) {
187  int sx = mb_x * 16 + 4 + 8 * (i & 1);
188  int sy = mb_y * 16 + 4 + 8 * (i >> 1);
189  int xy = (mb_x * 2 + (i & 1) +
190  (mb_y * 2 + (i >> 1)) * mv_stride) << (mv_sample_log2 - 1);
191  int mx = motion_val[direction][xy][0];
192  int my = motion_val[direction][xy][1];
193  mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
194  }
195  } else if (IS_16X8(mb_type)) {
196  for (i = 0; i < 2; i++) {
197  int sx = mb_x * 16 + 8;
198  int sy = mb_y * 16 + 4 + 8 * i;
199  int xy = (mb_x * 2 + (mb_y * 2 + i) * mv_stride) << (mv_sample_log2 - 1);
200  int mx = motion_val[direction][xy][0];
201  int my = motion_val[direction][xy][1];
202 
203  if (IS_INTERLACED(mb_type))
204  my *= 2;
205 
206  mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
207  }
208  } else if (IS_8X16(mb_type)) {
209  for (i = 0; i < 2; i++) {
210  int sx = mb_x * 16 + 4 + 8 * i;
211  int sy = mb_y * 16 + 8;
212  int xy = (mb_x * 2 + i + mb_y * 2 * mv_stride) << (mv_sample_log2 - 1);
213  int mx = motion_val[direction][xy][0];
214  int my = motion_val[direction][xy][1];
215 
216  if (IS_INTERLACED(mb_type))
217  my *= 2;
218 
219  mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
220  }
221  } else {
222  int sx = mb_x * 16 + 8;
223  int sy = mb_y * 16 + 8;
224  int xy = (mb_x + mb_y * mv_stride) << mv_sample_log2;
225  int mx = motion_val[direction][xy][0];
226  int my = motion_val[direction][xy][1];
227  mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
228  }
229  }
230  }
231  }
232 
233  if (mbcount) {
234  AVFrameSideData *sd;
235 
236  av_log(avctx, AV_LOG_DEBUG, "Adding %d MVs info to frame %"PRId64"\n", mbcount, avctx->frame_num);
238  if (!sd) {
239  av_freep(&mvs);
240  return;
241  }
242  memcpy(sd->data, mvs, mbcount * sizeof(AVMotionVector));
243  }
244 
245  av_freep(&mvs);
246  }
247 
248  /* TODO: export all the following to make them accessible for users (and filters) */
249  if (avctx->hwaccel || !mbtype_table)
250  return;
251 
252 
253  if (avctx->debug & (FF_DEBUG_SKIP | FF_DEBUG_QP | FF_DEBUG_MB_TYPE)) {
254  int x,y;
255  AVBPrint buf;
256  int n;
257  int margin_left;
258  int x_step;
259 
260  av_log(avctx, AV_LOG_DEBUG, "New frame, type: %c\n",
262 
263  margin_left = 2;
264  n = mb_width << 4;
265  while ((n /= 10))
266  margin_left++;
267 
269  av_bprint_chars(&buf, ' ', margin_left);
270 
271  n = 0;
272  if (avctx->debug & FF_DEBUG_SKIP)
273  n++;
274  if (avctx->debug & FF_DEBUG_QP)
275  n += 2;
276  if (avctx->debug & FF_DEBUG_MB_TYPE)
277  n += 3;
278  x_step = (mb_width * 16 > 999) ? 8 : 4;
279  for (x = 0; x < mb_width; x += x_step)
280  av_bprintf(&buf, "%-*d", n * x_step, x << 4);
281 
282  av_log(avctx, AV_LOG_DEBUG, "%s\n", buf.str);
283 
284  for (y = 0; y < mb_height; y++) {
286  for (x = 0; x < mb_width; x++) {
287  if (x == 0)
288  av_bprintf(&buf, "%*d ", margin_left - 1, y << 4);
289  if (avctx->debug & FF_DEBUG_SKIP) {
290  int count = mbskip_table ? mbskip_table[x + y * mb_stride] : 0;
291  if (count > 9)
292  count = 9;
293  av_bprintf(&buf, "%1d", count);
294  }
295  if (avctx->debug & FF_DEBUG_QP) {
296  av_bprintf(&buf, "%2d", qscale_table[x + y * mb_stride]);
297  }
298  if (avctx->debug & FF_DEBUG_MB_TYPE) {
299  int mb_type = mbtype_table[x + y * mb_stride];
300 
301  av_bprintf(&buf, "%c%c%c",
302  get_type_mv_char(mb_type),
303  get_segmentation_char(mb_type),
304  get_interlacement_char(mb_type));
305  }
306  }
307 
308  av_log(avctx, AV_LOG_DEBUG, "%s\n", buf.str);
309  }
311  }
312 }
PICT_FRAME
#define PICT_FRAME
Definition: mpegutils.h:33
IS_INTRA4x4
#define IS_INTRA4x4(a)
Definition: mpegutils.h:63
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:54
AVCodecContext::hwaccel
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1427
IS_8X8
#define IS_8X8(a)
Definition: mpegutils.h:77
AV_BPRINT_SIZE_UNLIMITED
#define AV_BPRINT_SIZE_UNLIMITED
IS_GMC
#define IS_GMC(a)
Definition: mpegutils.h:73
IS_ACPRED
#define IS_ACPRED(a)
Definition: mpegutils.h:82
av_bprint_init
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
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:795
SLICE_FLAG_CODED_ORDER
#define SLICE_FLAG_CODED_ORDER
draw_horiz_band() is called in coded order instead of display
Definition: avcodec.h:731
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:2965
SLICE_FLAG_ALLOW_FIELD
#define SLICE_FLAG_ALLOW_FIELD
allow draw_horiz_band() with field slices (MPEG-2 field pics)
Definition: avcodec.h:732
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:375
pixdesc.h
mpegutils.h
AVFrame::buf
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:588
AVCodecContext::codec
const struct AVCodec * codec
Definition: avcodec.h:454
USES_LIST
#define USES_LIST(a, list)
Definition: mpegutils.h:87
avassert.h
emms_c
#define emms_c()
Definition: emms.h:63
motion_vector.h
IS_16X8
#define IS_16X8(a)
Definition: mpegutils.h:75
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:69
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:455
NULL
#define NULL
Definition: coverity.c:32
AVCodecContext::slice_flags
int slice_flags
slice flags
Definition: avcodec.h:730
get_type_mv_char
static char get_type_mv_char(int mb_type)
Definition: mpegutils.c:107
FF_DEBUG_MB_TYPE
#define FF_DEBUG_MB_TYPE
Definition: avcodec.h:1400
IS_INTERLACED
#define IS_INTERLACED(a)
Definition: mpegutils.h:71
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:477
av_bprint_finalize
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:240
shift
static int shift(int a, int b)
Definition: bonk.c:261
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
AV_NUM_DATA_POINTERS
#define AV_NUM_DATA_POINTERS
Definition: frame.h:376
get_interlacement_char
static char get_interlacement_char(int mb_type)
Definition: mpegutils.c:152
AVFrameSideData::data
uint8_t * data
Definition: frame.h:252
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:64
mb
#define mb
Definition: vf_colormatrix.c:99
IS_DIRECT
#define IS_DIRECT(a)
Definition: mpegutils.h:72
IS_16X16
#define IS_16X16(a)
Definition: mpegutils.h:74
AVCodec::id
enum AVCodecID id
Definition: codec.h:201
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
emms.h
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:67
bprint.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:31
FF_DEBUG_SKIP
#define FF_DEBUG_SKIP
Definition: avcodec.h:1403
common.h
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AVCodecContext::height
int height
Definition: avcodec.h:618
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
avcodec.h
AVCodecContext::frame_num
int64_t frame_num
Frame counter, set by libavcodec.
Definition: avcodec.h:2030
av_bprintf
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:99
FF_DEBUG_QP
#define FF_DEBUG_QP
Definition: avcodec.h:1401
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:758
AVCodecContext
main external API structure.
Definition: avcodec.h:445
IS_PCM
#define IS_PCM(a)
Definition: mpegutils.h:65
AV_PICTURE_TYPE_B
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:281
av_bprint_clear
void av_bprint_clear(AVBPrint *buf)
Reset the string to "" but keep internal allocated data.
Definition: bprint.c:232
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:1926
IS_8X16
#define IS_8X16(a)
Definition: mpegutils.h:76
AVCodecContext::debug
int debug
debug
Definition: avcodec.h:1396
desc
const char * desc
Definition: libsvtav1.c:75
mem.h
AV_CODEC_EXPORT_DATA_MVS
#define AV_CODEC_EXPORT_DATA_MVS
Export motion vectors through frame side data.
Definition: avcodec.h:406
AVFrameSideData
Structure to hold side data for an AVFrame.
Definition: frame.h:250
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
scale
static void scale(int *out, const int *in, const int w, const int h, const int shift)
Definition: intra.c:291
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:35
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
av_bprint_chars
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:145
get_segmentation_char
static char get_segmentation_char(int mb_type)
Definition: mpegutils.c:138
first_field
static int first_field(const struct video_data *s)
Definition: v4l2.c:247
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:160