FFmpeg  4.3.9
mpegpicture.c
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1 /*
2  * Mpeg video formats-related picture management 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/avassert.h"
24 #include "libavutil/common.h"
25 #include "libavutil/pixdesc.h"
26 #include "libavutil/imgutils.h"
27 
28 #include "avcodec.h"
29 #include "motion_est.h"
30 #include "mpegpicture.h"
31 #include "mpegutils.h"
32 
33 static int make_tables_writable(Picture *pic)
34 {
35  int ret, i;
36 #define MAKE_WRITABLE(table) \
37 do {\
38  if (pic->table &&\
39  (ret = av_buffer_make_writable(&pic->table)) < 0)\
40  return ret;\
41 } while (0)
42 
43  MAKE_WRITABLE(mb_var_buf);
44  MAKE_WRITABLE(mc_mb_var_buf);
45  MAKE_WRITABLE(mb_mean_buf);
46  MAKE_WRITABLE(mbskip_table_buf);
47  MAKE_WRITABLE(qscale_table_buf);
48  MAKE_WRITABLE(mb_type_buf);
49 
50  for (i = 0; i < 2; i++) {
51  MAKE_WRITABLE(motion_val_buf[i]);
52  MAKE_WRITABLE(ref_index_buf[i]);
53  }
54 
55  return 0;
56 }
57 
59  ScratchpadContext *sc, int linesize)
60 {
61 # define EMU_EDGE_HEIGHT (4 * 70)
62  int alloc_size = FFALIGN(FFABS(linesize) + 64, 32);
63 
64  if (avctx->hwaccel)
65  return 0;
66 
67  if (linesize < 24) {
68  av_log(avctx, AV_LOG_ERROR, "Image too small, temporary buffers cannot function\n");
69  return AVERROR_PATCHWELCOME;
70  }
71 
72  if (av_image_check_size2(alloc_size, EMU_EDGE_HEIGHT, avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx) < 0)
73  return AVERROR(ENOMEM);
74 
75  // edge emu needs blocksize + filter length - 1
76  // (= 17x17 for halfpel / 21x21 for H.264)
77  // VC-1 computes luma and chroma simultaneously and needs 19X19 + 9x9
78  // at uvlinesize. It supports only YUV420 so 24x24 is enough
79  // linesize * interlaced * MBsize
80  // we also use this buffer for encoding in encode_mb_internal() needig an additional 32 lines
82  fail);
83 
84  FF_ALLOCZ_ARRAY_OR_GOTO(avctx, me->scratchpad, alloc_size, 4 * 16 * 2,
85  fail)
86  me->temp = me->scratchpad;
87  sc->rd_scratchpad = me->scratchpad;
88  sc->b_scratchpad = me->scratchpad;
89  sc->obmc_scratchpad = me->scratchpad + 16;
90 
91  return 0;
92 fail:
94  return AVERROR(ENOMEM);
95 }
96 
97 /**
98  * Allocate a frame buffer
99  */
100 static int alloc_frame_buffer(AVCodecContext *avctx, Picture *pic,
102  int chroma_x_shift, int chroma_y_shift,
103  int linesize, int uvlinesize)
104 {
105  int edges_needed = av_codec_is_encoder(avctx->codec);
106  int r, ret;
107 
108  pic->tf.f = pic->f;
109  if (avctx->codec_id != AV_CODEC_ID_WMV3IMAGE &&
110  avctx->codec_id != AV_CODEC_ID_VC1IMAGE &&
111  avctx->codec_id != AV_CODEC_ID_MSS2) {
112  if (edges_needed) {
113  pic->f->width = avctx->width + 2 * EDGE_WIDTH;
114  pic->f->height = avctx->height + 2 * EDGE_WIDTH;
115  }
116 
117  r = ff_thread_get_buffer(avctx, &pic->tf,
118  pic->reference ? AV_GET_BUFFER_FLAG_REF : 0);
119  } else {
120  pic->f->width = avctx->width;
121  pic->f->height = avctx->height;
122  pic->f->format = avctx->pix_fmt;
123  r = avcodec_default_get_buffer2(avctx, pic->f, 0);
124  }
125 
126  if (r < 0 || !pic->f->buf[0]) {
127  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed (%d %p)\n",
128  r, pic->f->data[0]);
129  return -1;
130  }
131 
132  if (edges_needed) {
133  int i;
134  for (i = 0; pic->f->data[i]; i++) {
135  int offset = (EDGE_WIDTH >> (i ? chroma_y_shift : 0)) *
136  pic->f->linesize[i] +
137  (EDGE_WIDTH >> (i ? chroma_x_shift : 0));
138  pic->f->data[i] += offset;
139  }
140  pic->f->width = avctx->width;
141  pic->f->height = avctx->height;
142  }
143 
144  if (avctx->hwaccel) {
145  assert(!pic->hwaccel_picture_private);
146  if (avctx->hwaccel->frame_priv_data_size) {
148  if (!pic->hwaccel_priv_buf) {
149  av_log(avctx, AV_LOG_ERROR, "alloc_frame_buffer() failed (hwaccel private data allocation)\n");
150  return -1;
151  }
153  }
154  }
155 
156  if ((linesize && linesize != pic->f->linesize[0]) ||
157  (uvlinesize && uvlinesize != pic->f->linesize[1])) {
158  av_log(avctx, AV_LOG_ERROR,
159  "get_buffer() failed (stride changed: linesize=%d/%d uvlinesize=%d/%d)\n",
160  linesize, pic->f->linesize[0],
161  uvlinesize, pic->f->linesize[1]);
162  ff_mpeg_unref_picture(avctx, pic);
163  return -1;
164  }
165 
166  if (av_pix_fmt_count_planes(pic->f->format) > 2 &&
167  pic->f->linesize[1] != pic->f->linesize[2]) {
168  av_log(avctx, AV_LOG_ERROR,
169  "get_buffer() failed (uv stride mismatch)\n");
170  ff_mpeg_unref_picture(avctx, pic);
171  return -1;
172  }
173 
174  if (!sc->edge_emu_buffer &&
175  (ret = ff_mpeg_framesize_alloc(avctx, me, sc,
176  pic->f->linesize[0])) < 0) {
177  av_log(avctx, AV_LOG_ERROR,
178  "get_buffer() failed to allocate context scratch buffers.\n");
179  ff_mpeg_unref_picture(avctx, pic);
180  return ret;
181  }
182 
183  return 0;
184 }
185 
186 static int alloc_picture_tables(AVCodecContext *avctx, Picture *pic, int encoding, int out_format,
187  int mb_stride, int mb_width, int mb_height, int b8_stride)
188 {
189  const int big_mb_num = mb_stride * (mb_height + 1) + 1;
190  const int mb_array_size = mb_stride * mb_height;
191  const int b8_array_size = b8_stride * mb_height * 2;
192  int i;
193 
194 
195  pic->mbskip_table_buf = av_buffer_allocz(mb_array_size + 2);
196  pic->qscale_table_buf = av_buffer_allocz(big_mb_num + mb_stride);
197  pic->mb_type_buf = av_buffer_allocz((big_mb_num + mb_stride) *
198  sizeof(uint32_t));
199  if (!pic->mbskip_table_buf || !pic->qscale_table_buf || !pic->mb_type_buf)
200  return AVERROR(ENOMEM);
201 
202  if (encoding) {
203  pic->mb_var_buf = av_buffer_allocz(mb_array_size * sizeof(int16_t));
204  pic->mc_mb_var_buf = av_buffer_allocz(mb_array_size * sizeof(int16_t));
205  pic->mb_mean_buf = av_buffer_allocz(mb_array_size);
206  if (!pic->mb_var_buf || !pic->mc_mb_var_buf || !pic->mb_mean_buf)
207  return AVERROR(ENOMEM);
208  }
209 
210  if (out_format == FMT_H263 || encoding ||
211 #if FF_API_DEBUG_MV
212  avctx->debug_mv ||
213 #endif
215  int mv_size = 2 * (b8_array_size + 4) * sizeof(int16_t);
216  int ref_index_size = 4 * mb_array_size;
217 
218  for (i = 0; mv_size && i < 2; i++) {
219  pic->motion_val_buf[i] = av_buffer_allocz(mv_size);
220  pic->ref_index_buf[i] = av_buffer_allocz(ref_index_size);
221  if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i])
222  return AVERROR(ENOMEM);
223  }
224  }
225 
226  pic->alloc_mb_width = mb_width;
227  pic->alloc_mb_height = mb_height;
228 
229  return 0;
230 }
231 
232 /**
233  * Allocate a Picture.
234  * The pixels are allocated/set by calling get_buffer() if shared = 0
235  */
237  ScratchpadContext *sc, int shared, int encoding,
238  int chroma_x_shift, int chroma_y_shift, int out_format,
239  int mb_stride, int mb_width, int mb_height, int b8_stride,
240  ptrdiff_t *linesize, ptrdiff_t *uvlinesize)
241 {
242  int i, ret;
243 
244  if (pic->qscale_table_buf)
245  if ( pic->alloc_mb_width != mb_width
246  || pic->alloc_mb_height != mb_height)
248 
249  if (shared) {
250  av_assert0(pic->f->data[0]);
251  pic->shared = 1;
252  } else {
253  av_assert0(!pic->f->buf[0]);
254  if (alloc_frame_buffer(avctx, pic, me, sc,
255  chroma_x_shift, chroma_y_shift,
256  *linesize, *uvlinesize) < 0)
257  return -1;
258 
259  *linesize = pic->f->linesize[0];
260  *uvlinesize = pic->f->linesize[1];
261  }
262 
263  if (!pic->qscale_table_buf)
264  ret = alloc_picture_tables(avctx, pic, encoding, out_format,
265  mb_stride, mb_width, mb_height, b8_stride);
266  else
267  ret = make_tables_writable(pic);
268  if (ret < 0)
269  goto fail;
270 
271  if (encoding) {
272  pic->mb_var = (uint16_t*)pic->mb_var_buf->data;
273  pic->mc_mb_var = (uint16_t*)pic->mc_mb_var_buf->data;
274  pic->mb_mean = pic->mb_mean_buf->data;
275  }
276 
277  pic->mbskip_table = pic->mbskip_table_buf->data;
278  pic->qscale_table = pic->qscale_table_buf->data + 2 * mb_stride + 1;
279  pic->mb_type = (uint32_t*)pic->mb_type_buf->data + 2 * mb_stride + 1;
280 
281  if (pic->motion_val_buf[0]) {
282  for (i = 0; i < 2; i++) {
283  pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;
284  pic->ref_index[i] = pic->ref_index_buf[i]->data;
285  }
286  }
287 
288  return 0;
289 fail:
290  av_log(avctx, AV_LOG_ERROR, "Error allocating a picture.\n");
291  ff_mpeg_unref_picture(avctx, pic);
293  return AVERROR(ENOMEM);
294 }
295 
296 /**
297  * Deallocate a picture.
298  */
300 {
301  int off = offsetof(Picture, mb_mean) + sizeof(pic->mb_mean);
302 
303  pic->tf.f = pic->f;
304  /* WM Image / Screen codecs allocate internal buffers with different
305  * dimensions / colorspaces; ignore user-defined callbacks for these. */
306  if (avctx->codec_id != AV_CODEC_ID_WMV3IMAGE &&
307  avctx->codec_id != AV_CODEC_ID_VC1IMAGE &&
308  avctx->codec_id != AV_CODEC_ID_MSS2)
309  ff_thread_release_buffer(avctx, &pic->tf);
310  else if (pic->f)
311  av_frame_unref(pic->f);
312 
314 
315  if (pic->needs_realloc)
317 
318  memset((uint8_t*)pic + off, 0, sizeof(*pic) - off);
319 }
320 
322 {
323  int i;
324 
325 #define UPDATE_TABLE(table) \
326 do { \
327  if (src->table && \
328  (!dst->table || dst->table->buffer != src->table->buffer)) { \
329  av_buffer_unref(&dst->table); \
330  dst->table = av_buffer_ref(src->table); \
331  if (!dst->table) { \
332  ff_free_picture_tables(dst); \
333  return AVERROR(ENOMEM); \
334  } \
335  } \
336 } while (0)
337 
338  UPDATE_TABLE(mb_var_buf);
339  UPDATE_TABLE(mc_mb_var_buf);
340  UPDATE_TABLE(mb_mean_buf);
341  UPDATE_TABLE(mbskip_table_buf);
342  UPDATE_TABLE(qscale_table_buf);
343  UPDATE_TABLE(mb_type_buf);
344  for (i = 0; i < 2; i++) {
345  UPDATE_TABLE(motion_val_buf[i]);
346  UPDATE_TABLE(ref_index_buf[i]);
347  }
348 
349  dst->mb_var = src->mb_var;
350  dst->mc_mb_var = src->mc_mb_var;
351  dst->mb_mean = src->mb_mean;
352  dst->mbskip_table = src->mbskip_table;
353  dst->qscale_table = src->qscale_table;
354  dst->mb_type = src->mb_type;
355  for (i = 0; i < 2; i++) {
356  dst->motion_val[i] = src->motion_val[i];
357  dst->ref_index[i] = src->ref_index[i];
358  }
359 
360  dst->alloc_mb_width = src->alloc_mb_width;
361  dst->alloc_mb_height = src->alloc_mb_height;
362 
363  return 0;
364 }
365 
367 {
368  int ret;
369 
370  av_assert0(!dst->f->buf[0]);
371  av_assert0(src->f->buf[0]);
372 
373  src->tf.f = src->f;
374  dst->tf.f = dst->f;
375  ret = ff_thread_ref_frame(&dst->tf, &src->tf);
376  if (ret < 0)
377  goto fail;
378 
379  ret = ff_update_picture_tables(dst, src);
380  if (ret < 0)
381  goto fail;
382 
383  if (src->hwaccel_picture_private) {
385  if (!dst->hwaccel_priv_buf) {
386  ret = AVERROR(ENOMEM);
387  goto fail;
388  }
390  }
391 
392  dst->field_picture = src->field_picture;
393  dst->mb_var_sum = src->mb_var_sum;
394  dst->mc_mb_var_sum = src->mc_mb_var_sum;
395  dst->b_frame_score = src->b_frame_score;
396  dst->needs_realloc = src->needs_realloc;
397  dst->reference = src->reference;
398  dst->shared = src->shared;
399 
400  memcpy(dst->encoding_error, src->encoding_error,
401  sizeof(dst->encoding_error));
402 
403  return 0;
404 fail:
405  ff_mpeg_unref_picture(avctx, dst);
406  return ret;
407 }
408 
409 static inline int pic_is_unused(Picture *pic)
410 {
411  if (!pic->f->buf[0])
412  return 1;
413  if (pic->needs_realloc && !(pic->reference & DELAYED_PIC_REF))
414  return 1;
415  return 0;
416 }
417 
418 static int find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
419 {
420  int i;
421 
422  if (shared) {
423  for (i = 0; i < MAX_PICTURE_COUNT; i++) {
424  if (!picture[i].f->buf[0])
425  return i;
426  }
427  } else {
428  for (i = 0; i < MAX_PICTURE_COUNT; i++) {
429  if (pic_is_unused(&picture[i]))
430  return i;
431  }
432  }
433 
434  av_log(avctx, AV_LOG_FATAL,
435  "Internal error, picture buffer overflow\n");
436  /* We could return -1, but the codec would crash trying to draw into a
437  * non-existing frame anyway. This is safer than waiting for a random crash.
438  * Also the return of this is never useful, an encoder must only allocate
439  * as much as allowed in the specification. This has no relationship to how
440  * much libavcodec could allocate (and MAX_PICTURE_COUNT is always large
441  * enough for such valid streams).
442  * Plus, a decoder has to check stream validity and remove frames if too
443  * many reference frames are around. Waiting for "OOM" is not correct at
444  * all. Similarly, missing reference frames have to be replaced by
445  * interpolated/MC frames, anything else is a bug in the codec ...
446  */
447  abort();
448  return -1;
449 }
450 
451 int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
452 {
453  int ret = find_unused_picture(avctx, picture, shared);
454 
455  if (ret >= 0 && ret < MAX_PICTURE_COUNT) {
456  if (picture[ret].needs_realloc) {
457  picture[ret].needs_realloc = 0;
458  ff_free_picture_tables(&picture[ret]);
459  ff_mpeg_unref_picture(avctx, &picture[ret]);
460  }
461  }
462  return ret;
463 }
464 
466 {
467  int i;
468 
469  pic->alloc_mb_width =
470  pic->alloc_mb_height = 0;
471 
478 
479  for (i = 0; i < 2; i++) {
481  av_buffer_unref(&pic->ref_index_buf[i]);
482  }
483 }
uint8_t * scratchpad
data area for the ME algo, so that the ME does not need to malloc/free.
Definition: motion_est.h:52
const struct AVCodec * codec
Definition: avcodec.h:535
int8_t * ref_index[2]
Definition: mpegpicture.h:62
AVBufferRef * mb_var_buf
Definition: mpegpicture.h:64
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it...
Definition: buffer.c:125
#define FF_ALLOCZ_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)
Definition: internal.h:167
int av_codec_is_encoder(const AVCodec *codec)
Definition: utils.c:94
uint8_t * mb_mean
Table for MB luminance.
Definition: mpegpicture.h:74
uint8_t * edge_emu_buffer
temporary buffer for if MVs point to out-of-frame data
Definition: mpegpicture.h:36
misc image utilities
AVFrame * f
Definition: thread.h:35
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2589
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:491
uint16_t * mb_var
Table for MB variances.
Definition: mpegpicture.h:65
static int pic_is_unused(Picture *pic)
Definition: mpegpicture.c:409
#define me
int needs_realloc
Picture needs to be reallocated (eg due to a frame size change)
Definition: mpegpicture.h:85
#define DELAYED_PIC_REF
Value of Picture.reference when Picture is not a reference picture, but is held for delayed output...
Definition: diracdec.c:67
int field_picture
whether or not the picture was encoded in separate fields
Definition: mpegpicture.h:79
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
static int alloc_frame_buffer(AVCodecContext *avctx, Picture *pic, MotionEstContext *me, ScratchpadContext *sc, int chroma_x_shift, int chroma_y_shift, int linesize, int uvlinesize)
Allocate a frame buffer.
Definition: mpegpicture.c:100
int ff_mpeg_ref_picture(AVCodecContext *avctx, Picture *dst, Picture *src)
Definition: mpegpicture.c:366
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1694
int b_frame_score
Definition: mpegpicture.h:84
int alloc_mb_width
mb_width used to allocate tables
Definition: mpegpicture.h:70
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int export_side_data
Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of metadata exported in frame...
Definition: avcodec.h:2358
uint8_t
#define AV_CODEC_EXPORT_DATA_MVS
Export motion vectors through frame side data.
Definition: avcodec.h:403
static int make_tables_writable(Picture *pic)
Definition: mpegpicture.c:33
#define f(width, name)
Definition: cbs_vp9.c:255
Motion estimation context.
Definition: motion_est.h:47
#define FF_API_DEBUG_MV
Definition: version.h:58
void ff_free_picture_tables(Picture *pic)
Definition: mpegpicture.c:465
int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
Definition: mpegpicture.c:451
int ff_thread_ref_frame(ThreadFrame *dst, ThreadFrame *src)
Definition: utils.c:1894
AVBufferRef * mb_type_buf
Definition: mpegpicture.h:55
#define FFALIGN(x, a)
Definition: macros.h:48
#define av_log(a,...)
#define UPDATE_TABLE(table)
AVBufferRef * mb_mean_buf
Definition: mpegpicture.h:73
#define EDGE_WIDTH
Definition: mpegpicture.h:33
ThreadFrame tf
Definition: mpegpicture.h:47
#define src
Definition: vp8dsp.c:254
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
int width
Definition: frame.h:358
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
uint8_t * mbskip_table
Definition: mpegpicture.h:59
static int alloc_picture_tables(AVCodecContext *avctx, Picture *pic, int encoding, int out_format, int mb_stride, int mb_width, int mb_height, int b8_stride)
Definition: mpegpicture.c:186
void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
Wrapper around release_buffer() frame-for multithreaded codecs.
uint8_t * rd_scratchpad
scratchpad for rate distortion mb decision
Definition: mpegpicture.h:37
#define AVERROR(e)
Definition: error.h:43
uint64_t encoding_error[AV_NUM_DATA_POINTERS]
Definition: mpegpicture.h:90
#define MAX_PICTURE_COUNT
Definition: mpegpicture.h:32
int reference
Definition: mpegpicture.h:87
const char * r
Definition: vf_curves.c:114
simple assert() macros that are a bit more flexible than ISO C assert().
int64_t max_pixels
The number of pixels per image to maximally accept.
Definition: avcodec.h:2260
static const uint8_t offset[127][2]
Definition: vf_spp.c:93
#define fail()
Definition: checkasm.h:123
AVBufferRef * hwaccel_priv_buf
Definition: mpegpicture.h:76
AVBufferRef * motion_val_buf[2]
Definition: mpegpicture.h:52
int width
picture width / height.
Definition: avcodec.h:699
int16_t(*[2] motion_val)[2]
Definition: mpegpicture.h:53
Picture.
Definition: mpegpicture.h:45
void * hwaccel_picture_private
Hardware accelerator private data.
Definition: mpegpicture.h:77
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:373
uint16_t * mc_mb_var
Table for motion compensated MB variances.
Definition: mpegpicture.h:68
AVBufferRef * qscale_table_buf
Definition: mpegpicture.h:49
int alloc_mb_height
mb_height used to allocate tables
Definition: mpegpicture.h:71
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags)
The default callback for AVCodecContext.get_buffer2().
Definition: decode.c:1649
Libavcodec external API header.
enum AVCodecID codec_id
Definition: avcodec.h:536
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:331
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
main external API structure.
Definition: avcodec.h:526
int ff_alloc_picture(AVCodecContext *avctx, Picture *pic, MotionEstContext *me, ScratchpadContext *sc, int shared, int encoding, int chroma_x_shift, int chroma_y_shift, int out_format, int mb_stride, int mb_width, int mb_height, int b8_stride, ptrdiff_t *linesize, ptrdiff_t *uvlinesize)
Allocate a Picture.
Definition: mpegpicture.c:236
uint8_t * data
The data buffer.
Definition: buffer.h:89
AVBufferRef * av_buffer_allocz(int size)
Same as av_buffer_alloc(), except the returned buffer will be initialized to zero.
Definition: buffer.c:83
int ff_mpeg_framesize_alloc(AVCodecContext *avctx, MotionEstContext *me, ScratchpadContext *sc, int linesize)
Definition: mpegpicture.c:58
int64_t mc_mb_var_sum
motion compensated MB variance for current frame
Definition: mpegpicture.h:82
struct AVFrame * f
Definition: mpegpicture.h:46
static int find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
Definition: mpegpicture.c:418
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:554
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
int8_t * qscale_table
Definition: mpegpicture.h:50
void ff_mpeg_unref_picture(AVCodecContext *avctx, Picture *pic)
Deallocate a picture.
Definition: mpegpicture.c:299
#define MAKE_WRITABLE(table)
common internal and external API header
if(ret< 0)
Definition: vf_mcdeint.c:279
AVBufferRef * mbskip_table_buf
Definition: mpegpicture.h:58
int shared
Definition: mpegpicture.h:88
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:93
uint8_t * b_scratchpad
scratchpad used for writing into write only buffers
Definition: mpegpicture.h:39
int av_image_check_size2(unsigned int w, unsigned int h, int64_t max_pixels, enum AVPixelFormat pix_fmt, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of a plane of an image with...
Definition: imgutils.c:253
int ff_update_picture_tables(Picture *dst, Picture *src)
Definition: mpegpicture.c:321
uint8_t * obmc_scratchpad
Definition: mpegpicture.h:38
int frame_priv_data_size
Size of per-frame hardware accelerator private data.
Definition: avcodec.h:2524
AVBufferRef * mc_mb_var_buf
Definition: mpegpicture.h:67
#define EMU_EDGE_HEIGHT
int height
Definition: frame.h:358
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
#define av_freep(p)
uint8_t * temp
Definition: motion_est.h:56
#define AV_LOG_FATAL
Something went wrong and recovery is not possible.
Definition: log.h:170
int debug_mv
debug motion vectors
Definition: avcodec.h:2161
int64_t mb_var_sum
sum of MB variance for current frame
Definition: mpegpicture.h:81
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:509
AVBufferRef * ref_index_buf[2]
Definition: mpegpicture.h:61