FFmpeg
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 "encode.h"
30 #include "motion_est.h"
31 #include "mpegpicture.h"
32 #include "mpegutils.h"
33 #include "threadframe.h"
34 
36 {
37  pic->alloc_mb_width =
38  pic->alloc_mb_height = 0;
39 
43 
44  for (int i = 0; i < 2; i++) {
47  }
48 }
49 
50 static int make_tables_writable(Picture *pic)
51 {
52  int ret, i;
53 #define MAKE_WRITABLE(table) \
54 do {\
55  if (pic->table &&\
56  (ret = av_buffer_make_writable(&pic->table)) < 0)\
57  return ret;\
58 } while (0)
59 
60  MAKE_WRITABLE(mbskip_table_buf);
61  MAKE_WRITABLE(qscale_table_buf);
62  MAKE_WRITABLE(mb_type_buf);
63 
64  for (i = 0; i < 2; i++) {
65  MAKE_WRITABLE(motion_val_buf[i]);
66  MAKE_WRITABLE(ref_index_buf[i]);
67  }
68 
69  return 0;
70 }
71 
73  ScratchpadContext *sc, int linesize)
74 {
75 # define EMU_EDGE_HEIGHT (4 * 70)
76  int alloc_size = FFALIGN(FFABS(linesize) + 64, 32);
77 
78  if (avctx->hwaccel)
79  return 0;
80 
81  if (linesize < 24) {
82  av_log(avctx, AV_LOG_ERROR, "Image too small, temporary buffers cannot function\n");
83  return AVERROR_PATCHWELCOME;
84  }
85 
86  if (av_image_check_size2(alloc_size, EMU_EDGE_HEIGHT, avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx) < 0)
87  return AVERROR(ENOMEM);
88 
89  // edge emu needs blocksize + filter length - 1
90  // (= 17x17 for halfpel / 21x21 for H.264)
91  // VC-1 computes luma and chroma simultaneously and needs 19X19 + 9x9
92  // at uvlinesize. It supports only YUV420 so 24x24 is enough
93  // linesize * interlaced * MBsize
94  // we also use this buffer for encoding in encode_mb_internal() needig an additional 32 lines
95  if (!FF_ALLOCZ_TYPED_ARRAY(sc->edge_emu_buffer, alloc_size * EMU_EDGE_HEIGHT) ||
96  !FF_ALLOCZ_TYPED_ARRAY(me->scratchpad, alloc_size * 4 * 16 * 2)) {
98  return AVERROR(ENOMEM);
99  }
100 
101  me->temp = me->scratchpad;
102  sc->rd_scratchpad = me->scratchpad;
103  sc->b_scratchpad = me->scratchpad;
104  sc->obmc_scratchpad = me->scratchpad + 16;
105 
106  return 0;
107 }
108 
109 /**
110  * Allocate a frame buffer
111  */
112 static int alloc_frame_buffer(AVCodecContext *avctx, Picture *pic,
114  int chroma_x_shift, int chroma_y_shift,
115  int linesize, int uvlinesize)
116 {
117  int edges_needed = av_codec_is_encoder(avctx->codec);
118  int r, ret;
119 
120  pic->tf.f = pic->f;
121 
122  if (edges_needed) {
123  pic->f->width = avctx->width + 2 * EDGE_WIDTH;
124  pic->f->height = avctx->height + 2 * EDGE_WIDTH;
125 
126  r = ff_encode_alloc_frame(avctx, pic->f);
127  } else if (avctx->codec_id != AV_CODEC_ID_WMV3IMAGE &&
128  avctx->codec_id != AV_CODEC_ID_VC1IMAGE &&
129  avctx->codec_id != AV_CODEC_ID_MSS2) {
130  r = ff_thread_get_ext_buffer(avctx, &pic->tf,
131  pic->reference ? AV_GET_BUFFER_FLAG_REF : 0);
132  } else {
133  pic->f->width = avctx->width;
134  pic->f->height = avctx->height;
135  pic->f->format = avctx->pix_fmt;
136  r = avcodec_default_get_buffer2(avctx, pic->f, 0);
137  }
138 
139  if (r < 0 || !pic->f->buf[0]) {
140  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed (%d %p)\n",
141  r, pic->f->data[0]);
142  return -1;
143  }
144 
145  if (edges_needed) {
146  int i;
147  for (i = 0; pic->f->data[i]; i++) {
148  int offset = (EDGE_WIDTH >> (i ? chroma_y_shift : 0)) *
149  pic->f->linesize[i] +
150  (EDGE_WIDTH >> (i ? chroma_x_shift : 0));
151  pic->f->data[i] += offset;
152  }
153  pic->f->width = avctx->width;
154  pic->f->height = avctx->height;
155  }
156 
157  if (avctx->hwaccel) {
158  assert(!pic->hwaccel_picture_private);
159  if (avctx->hwaccel->frame_priv_data_size) {
161  if (!pic->hwaccel_priv_buf) {
162  av_log(avctx, AV_LOG_ERROR, "alloc_frame_buffer() failed (hwaccel private data allocation)\n");
163  return -1;
164  }
166  }
167  }
168 
169  if ((linesize && linesize != pic->f->linesize[0]) ||
170  (uvlinesize && uvlinesize != pic->f->linesize[1])) {
171  av_log(avctx, AV_LOG_ERROR,
172  "get_buffer() failed (stride changed: linesize=%d/%d uvlinesize=%d/%d)\n",
173  linesize, pic->f->linesize[0],
174  uvlinesize, pic->f->linesize[1]);
175  ff_mpeg_unref_picture(avctx, pic);
176  return -1;
177  }
178 
179  if (av_pix_fmt_count_planes(pic->f->format) > 2 &&
180  pic->f->linesize[1] != pic->f->linesize[2]) {
181  av_log(avctx, AV_LOG_ERROR,
182  "get_buffer() failed (uv stride mismatch)\n");
183  ff_mpeg_unref_picture(avctx, pic);
184  return -1;
185  }
186 
187  if (!sc->edge_emu_buffer &&
188  (ret = ff_mpeg_framesize_alloc(avctx, me, sc,
189  pic->f->linesize[0])) < 0) {
190  av_log(avctx, AV_LOG_ERROR,
191  "get_buffer() failed to allocate context scratch buffers.\n");
192  ff_mpeg_unref_picture(avctx, pic);
193  return ret;
194  }
195 
196  return 0;
197 }
198 
199 static int alloc_picture_tables(AVCodecContext *avctx, Picture *pic, int encoding, int out_format,
200  int mb_stride, int mb_width, int mb_height, int b8_stride)
201 {
202  const int big_mb_num = mb_stride * (mb_height + 1) + 1;
203  const int mb_array_size = mb_stride * mb_height;
204  const int b8_array_size = b8_stride * mb_height * 2;
205  int i;
206 
207 
208  pic->mbskip_table_buf = av_buffer_allocz(mb_array_size + 2);
209  pic->qscale_table_buf = av_buffer_allocz(big_mb_num + mb_stride);
210  pic->mb_type_buf = av_buffer_allocz((big_mb_num + mb_stride) *
211  sizeof(uint32_t));
212  if (!pic->mbskip_table_buf || !pic->qscale_table_buf || !pic->mb_type_buf)
213  return AVERROR(ENOMEM);
214 
215  if (out_format == FMT_H263 || encoding ||
217  int mv_size = 2 * (b8_array_size + 4) * sizeof(int16_t);
218  int ref_index_size = 4 * mb_array_size;
219 
220  for (i = 0; mv_size && i < 2; i++) {
221  pic->motion_val_buf[i] = av_buffer_allocz(mv_size);
222  pic->ref_index_buf[i] = av_buffer_allocz(ref_index_size);
223  if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i])
224  return AVERROR(ENOMEM);
225  }
226  }
227 
228  pic->alloc_mb_width = mb_width;
229  pic->alloc_mb_height = mb_height;
230  pic->alloc_mb_stride = mb_stride;
231 
232  return 0;
233 }
234 
235 /**
236  * Allocate a Picture.
237  * The pixels are allocated/set by calling get_buffer() if shared = 0
238  */
240  ScratchpadContext *sc, int shared, int encoding,
241  int chroma_x_shift, int chroma_y_shift, int out_format,
242  int mb_stride, int mb_width, int mb_height, int b8_stride,
243  ptrdiff_t *linesize, ptrdiff_t *uvlinesize)
244 {
245  int i, ret;
246 
247  if (pic->qscale_table_buf)
248  if ( pic->alloc_mb_width != mb_width
249  || pic->alloc_mb_height != mb_height)
250  free_picture_tables(pic);
251 
252  if (shared) {
253  av_assert0(pic->f->data[0]);
254  pic->shared = 1;
255  } else {
256  av_assert0(!pic->f->buf[0]);
257  if (alloc_frame_buffer(avctx, pic, me, sc,
258  chroma_x_shift, chroma_y_shift,
259  *linesize, *uvlinesize) < 0)
260  return -1;
261 
262  *linesize = pic->f->linesize[0];
263  *uvlinesize = pic->f->linesize[1];
264  }
265 
266  if (!pic->qscale_table_buf)
267  ret = alloc_picture_tables(avctx, pic, encoding, out_format,
268  mb_stride, mb_width, mb_height, b8_stride);
269  else
270  ret = make_tables_writable(pic);
271  if (ret < 0)
272  goto fail;
273 
274  pic->mbskip_table = pic->mbskip_table_buf->data;
275  pic->qscale_table = pic->qscale_table_buf->data + 2 * mb_stride + 1;
276  pic->mb_type = (uint32_t*)pic->mb_type_buf->data + 2 * mb_stride + 1;
277 
278  if (pic->motion_val_buf[0]) {
279  for (i = 0; i < 2; i++) {
280  pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;
281  pic->ref_index[i] = pic->ref_index_buf[i]->data;
282  }
283  }
284 
285  return 0;
286 fail:
287  av_log(avctx, AV_LOG_ERROR, "Error allocating a picture.\n");
288  ff_mpeg_unref_picture(avctx, pic);
289  free_picture_tables(pic);
290  return AVERROR(ENOMEM);
291 }
292 
293 /**
294  * Deallocate a picture; frees the picture tables in case they
295  * need to be reallocated anyway.
296  */
298 {
299  int off = offsetof(Picture, hwaccel_priv_buf) + sizeof(pic->hwaccel_priv_buf);
300 
301  pic->tf.f = pic->f;
302  /* WM Image / Screen codecs allocate internal buffers with different
303  * dimensions / colorspaces; ignore user-defined callbacks for these. */
304  if (avctx->codec_id != AV_CODEC_ID_WMV3IMAGE &&
305  avctx->codec_id != AV_CODEC_ID_VC1IMAGE &&
306  avctx->codec_id != AV_CODEC_ID_MSS2)
307  ff_thread_release_ext_buffer(avctx, &pic->tf);
308  else if (pic->f)
309  av_frame_unref(pic->f);
310 
312 
313  if (pic->needs_realloc)
314  free_picture_tables(pic);
315 
316  memset((uint8_t*)pic + off, 0, sizeof(*pic) - off);
317 }
318 
320 {
321  int i, ret;
322 
323  ret = av_buffer_replace(&dst->mbskip_table_buf, src->mbskip_table_buf);
324  ret |= av_buffer_replace(&dst->qscale_table_buf, src->qscale_table_buf);
325  ret |= av_buffer_replace(&dst->mb_type_buf, src->mb_type_buf);
326  for (i = 0; i < 2; i++) {
327  ret |= av_buffer_replace(&dst->motion_val_buf[i], src->motion_val_buf[i]);
328  ret |= av_buffer_replace(&dst->ref_index_buf[i], src->ref_index_buf[i]);
329  }
330 
331  if (ret < 0) {
332  free_picture_tables(dst);
333  return ret;
334  }
335 
336  dst->mbskip_table = src->mbskip_table;
337  dst->qscale_table = src->qscale_table;
338  dst->mb_type = src->mb_type;
339  for (i = 0; i < 2; i++) {
340  dst->motion_val[i] = src->motion_val[i];
341  dst->ref_index[i] = src->ref_index[i];
342  }
343 
344  dst->alloc_mb_width = src->alloc_mb_width;
345  dst->alloc_mb_height = src->alloc_mb_height;
346  dst->alloc_mb_stride = src->alloc_mb_stride;
347 
348  return 0;
349 }
350 
352 {
353  int ret;
354 
355  av_assert0(!dst->f->buf[0]);
356  av_assert0(src->f->buf[0]);
357 
358  src->tf.f = src->f;
359  dst->tf.f = dst->f;
360  ret = ff_thread_ref_frame(&dst->tf, &src->tf);
361  if (ret < 0)
362  goto fail;
363 
365  if (ret < 0)
366  goto fail;
367 
368  if (src->hwaccel_picture_private) {
369  dst->hwaccel_priv_buf = av_buffer_ref(src->hwaccel_priv_buf);
370  if (!dst->hwaccel_priv_buf) {
371  ret = AVERROR(ENOMEM);
372  goto fail;
373  }
375  }
376 
377  dst->field_picture = src->field_picture;
378  dst->mb_var_sum = src->mb_var_sum;
379  dst->mc_mb_var_sum = src->mc_mb_var_sum;
380  dst->b_frame_score = src->b_frame_score;
381  dst->needs_realloc = src->needs_realloc;
382  dst->reference = src->reference;
383  dst->shared = src->shared;
384 
385  memcpy(dst->encoding_error, src->encoding_error,
386  sizeof(dst->encoding_error));
387 
388  return 0;
389 fail:
390  ff_mpeg_unref_picture(avctx, dst);
391  return ret;
392 }
393 
394 static inline int pic_is_unused(Picture *pic)
395 {
396  if (!pic->f->buf[0])
397  return 1;
398  if (pic->needs_realloc)
399  return 1;
400  return 0;
401 }
402 
403 static int find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
404 {
405  int i;
406 
407  if (shared) {
408  for (i = 0; i < MAX_PICTURE_COUNT; i++) {
409  if (!picture[i].f->buf[0])
410  return i;
411  }
412  } else {
413  for (i = 0; i < MAX_PICTURE_COUNT; i++) {
414  if (pic_is_unused(&picture[i]))
415  return i;
416  }
417  }
418 
419  av_log(avctx, AV_LOG_FATAL,
420  "Internal error, picture buffer overflow\n");
421  /* We could return -1, but the codec would crash trying to draw into a
422  * non-existing frame anyway. This is safer than waiting for a random crash.
423  * Also the return of this is never useful, an encoder must only allocate
424  * as much as allowed in the specification. This has no relationship to how
425  * much libavcodec could allocate (and MAX_PICTURE_COUNT is always large
426  * enough for such valid streams).
427  * Plus, a decoder has to check stream validity and remove frames if too
428  * many reference frames are around. Waiting for "OOM" is not correct at
429  * all. Similarly, missing reference frames have to be replaced by
430  * interpolated/MC frames, anything else is a bug in the codec ...
431  */
432  abort();
433  return -1;
434 }
435 
436 int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
437 {
438  int ret = find_unused_picture(avctx, picture, shared);
439 
440  if (ret >= 0 && ret < MAX_PICTURE_COUNT) {
441  if (picture[ret].needs_realloc) {
442  ff_mpeg_unref_picture(avctx, &picture[ret]);
443  }
444  }
445  return ret;
446 }
447 
449 {
450  free_picture_tables(pic);
451  ff_mpeg_unref_picture(avctx, pic);
452  av_frame_free(&pic->f);
453 }
FF_ALLOCZ_TYPED_ARRAY
#define FF_ALLOCZ_TYPED_ARRAY(p, nelem)
Definition: internal.h:98
AVCodecContext::hwaccel
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1388
Picture::ref_index_buf
AVBufferRef * ref_index_buf[2]
Definition: mpegpicture.h:62
EMU_EDGE_HEIGHT
#define EMU_EDGE_HEIGHT
ScratchpadContext::obmc_scratchpad
uint8_t * obmc_scratchpad
Definition: mpegpicture.h:39
ff_mpeg_framesize_alloc
int ff_mpeg_framesize_alloc(AVCodecContext *avctx, MotionEstContext *me, ScratchpadContext *sc, int linesize)
Definition: mpegpicture.c:72
r
const char * r
Definition: vf_curves.c:116
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
free_picture_tables
static void av_noinline free_picture_tables(Picture *pic)
Definition: mpegpicture.c:35
ff_thread_release_ext_buffer
void ff_thread_release_ext_buffer(AVCodecContext *avctx, ThreadFrame *f)
Unref a ThreadFrame.
Definition: pthread_frame.c:1141
AVBufferRef::data
uint8_t * data
The data buffer.
Definition: buffer.h:90
ScratchpadContext::rd_scratchpad
uint8_t * rd_scratchpad
scratchpad for rate distortion mb decision
Definition: mpegpicture.h:38
MotionEstContext
Motion estimation context.
Definition: motion_est.h:47
Picture::alloc_mb_width
int alloc_mb_width
mb_width used to allocate tables
Definition: mpegpicture.h:65
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:116
Picture::field_picture
int field_picture
whether or not the picture was encoded in separate fields
Definition: mpegpicture.h:72
pixdesc.h
AVFrame::width
int width
Definition: frame.h:397
encode.h
Picture::ref_index
int8_t * ref_index[2]
Definition: mpegpicture.h:63
av_buffer_ref
AVBufferRef * av_buffer_ref(const AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:103
Picture
Picture.
Definition: mpegpicture.h:46
mpegutils.h
AVFrame::buf
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:525
make_tables_writable
static int make_tables_writable(Picture *pic)
Definition: mpegpicture.c:50
ThreadFrame::f
AVFrame * f
Definition: threadframe.h:28
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:346
ScratchpadContext
Definition: mpegpicture.h:36
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2715
Picture::needs_realloc
int needs_realloc
Picture needs to be reallocated (eg due to a frame size change)
Definition: mpegpicture.h:78
alloc_picture_tables
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:199
AVCodecContext::codec
const struct AVCodec * codec
Definition: avcodec.h:407
fail
#define fail()
Definition: checkasm.h:131
Picture::mbskip_table
uint8_t * mbskip_table
Definition: mpegpicture.h:60
av_noinline
#define av_noinline
Definition: attributes.h:72
motion_est.h
MAX_PICTURE_COUNT
#define MAX_PICTURE_COUNT
Definition: mpegpicture.h:33
av_image_check_size2
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:289
avassert.h
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
Picture::b_frame_score
int b_frame_score
Definition: mpegpicture.h:77
ff_mpeg_unref_picture
void ff_mpeg_unref_picture(AVCodecContext *avctx, Picture *pic)
Deallocate a picture; frees the picture tables in case they need to be reallocated anyway.
Definition: mpegpicture.c:297
Picture::hwaccel_priv_buf
AVBufferRef * hwaccel_priv_buf
Definition: mpegpicture.h:69
AV_GET_BUFFER_FLAG_REF
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:376
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
AVCodecContext::max_pixels
int64_t max_pixels
The number of pixels per image to maximally accept.
Definition: avcodec.h:1917
AV_CODEC_ID_VC1IMAGE
@ AV_CODEC_ID_VC1IMAGE
Definition: codec_id.h:202
Picture::hwaccel_picture_private
void * hwaccel_picture_private
Hardware accelerator private data.
Definition: mpegpicture.h:70
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:408
ff_thread_ref_frame
int ff_thread_ref_frame(ThreadFrame *dst, const ThreadFrame *src)
Definition: utils.c:891
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:64
if
if(ret)
Definition: filter_design.txt:179
Picture::reference
int reference
Definition: mpegpicture.h:80
Picture::mb_type_buf
AVBufferRef * mb_type_buf
Definition: mpegpicture.h:56
ff_find_unused_picture
int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
Definition: mpegpicture.c:436
threadframe.h
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
av_buffer_unref
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:139
me
#define me
Definition: vf_colormatrix.c:104
EDGE_WIDTH
#define EDGE_WIDTH
Definition: mpegpicture.h:34
ff_update_picture_tables
int ff_update_picture_tables(Picture *dst, const Picture *src)
Definition: mpegpicture.c:319
Picture::motion_val_buf
AVBufferRef * motion_val_buf[2]
Definition: mpegpicture.h:53
Picture::tf
ThreadFrame tf
Definition: mpegpicture.h:48
ff_alloc_picture
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:239
alloc_frame_buffer
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:112
ff_encode_alloc_frame
int ff_encode_alloc_frame(AVCodecContext *avctx, AVFrame *frame)
Allocate buffers for a frame.
Definition: encode.c:674
f
f
Definition: af_crystalizer.c:122
ff_mpeg_ref_picture
int ff_mpeg_ref_picture(AVCodecContext *avctx, Picture *dst, Picture *src)
Definition: mpegpicture.c:351
Picture::mc_mb_var_sum
int64_t mc_mb_var_sum
motion compensated MB variance for current frame
Definition: mpegpicture.h:75
Picture::qscale_table_buf
AVBufferRef * qscale_table_buf
Definition: mpegpicture.h:50
Picture::alloc_mb_height
int alloc_mb_height
mb_height used to allocate tables
Definition: mpegpicture.h:66
AVFrame::format
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:412
mpegpicture.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
Picture::motion_val
int16_t(*[2] motion_val)[2]
Definition: mpegpicture.h:54
Picture::encoding_error
uint64_t encoding_error[MPEGVIDEO_MAX_PLANES]
Definition: mpegpicture.h:83
AV_CODEC_ID_MSS2
@ AV_CODEC_ID_MSS2
Definition: codec_id.h:217
av_codec_is_encoder
int av_codec_is_encoder(const AVCodec *codec)
Definition: utils.c:74
avcodec_default_get_buffer2
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags)
The default callback for AVCodecContext.get_buffer2().
Definition: get_buffer.c:290
FMT_H263
@ FMT_H263
Definition: mpegutils.h:119
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
MAKE_WRITABLE
#define MAKE_WRITABLE(table)
common.h
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:487
ff_mpv_picture_free
void av_cold ff_mpv_picture_free(AVCodecContext *avctx, Picture *pic)
Definition: mpegpicture.c:448
av_buffer_replace
int av_buffer_replace(AVBufferRef **pdst, const AVBufferRef *src)
Ensure dst refers to the same data as src.
Definition: buffer.c:233
AVCodecContext::height
int height
Definition: avcodec.h:571
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:608
ff_thread_get_ext_buffer
int ff_thread_get_ext_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
Wrapper around ff_get_buffer() for frame-multithreaded codecs.
Definition: pthread_frame.c:1043
avcodec.h
av_buffer_allocz
AVBufferRef * av_buffer_allocz(size_t size)
Same as av_buffer_alloc(), except the returned buffer will be initialized to zero.
Definition: buffer.c:93
ret
ret
Definition: filter_design.txt:187
AV_LOG_FATAL
#define AV_LOG_FATAL
Something went wrong and recovery is not possible.
Definition: log.h:174
Picture::qscale_table
int8_t * qscale_table
Definition: mpegpicture.h:51
pic_is_unused
static int pic_is_unused(Picture *pic)
Definition: mpegpicture.c:394
AVCodecContext
main external API structure.
Definition: avcodec.h:398
AVFrame::height
int height
Definition: frame.h:397
Picture::shared
int shared
Definition: mpegpicture.h:81
ScratchpadContext::edge_emu_buffer
uint8_t * edge_emu_buffer
temporary buffer for if MVs point to out-of-frame data
Definition: mpegpicture.h:37
Picture::mb_type
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:57
Picture::f
struct AVFrame * f
Definition: mpegpicture.h:47
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AVHWAccel::frame_priv_data_size
int frame_priv_data_size
Size of per-frame hardware accelerator private data.
Definition: avcodec.h:2185
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:2015
Picture::mb_var_sum
int64_t mb_var_sum
sum of MB variance for current frame
Definition: mpegpicture.h:74
find_unused_picture
static int find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
Definition: mpegpicture.c:403
AV_CODEC_EXPORT_DATA_MVS
#define AV_CODEC_EXPORT_DATA_MVS
Export motion vectors through frame side data.
Definition: avcodec.h:357
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:571
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:370
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
Picture::mbskip_table_buf
AVBufferRef * mbskip_table_buf
Definition: mpegpicture.h:59
AV_CODEC_ID_WMV3IMAGE
@ AV_CODEC_ID_WMV3IMAGE
Definition: codec_id.h:201
ScratchpadContext::b_scratchpad
uint8_t * b_scratchpad
scratchpad used for writing into write only buffers
Definition: mpegpicture.h:40
Picture::alloc_mb_stride
int alloc_mb_stride
mb_stride used to allocate tables
Definition: mpegpicture.h:67