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 
51 {
52  AVBufferRef *old = *ref, *new;
53 
54  if (av_buffer_is_writable(old))
55  return 0;
56  new = av_buffer_allocz(old->size);
57  if (!new)
58  return AVERROR(ENOMEM);
60  *ref = new;
61  return 0;
62 }
63 
64 static int make_tables_writable(Picture *pic)
65 {
66 #define MAKE_WRITABLE(table) \
67 do {\
68  int ret = make_table_writable(&pic->table); \
69  if (ret < 0) \
70  return ret; \
71 } while (0)
72 
73  MAKE_WRITABLE(mbskip_table_buf);
74  MAKE_WRITABLE(qscale_table_buf);
75  MAKE_WRITABLE(mb_type_buf);
76 
77  if (pic->motion_val_buf[0]) {
78  for (int i = 0; i < 2; i++) {
79  MAKE_WRITABLE(motion_val_buf[i]);
80  MAKE_WRITABLE(ref_index_buf[i]);
81  }
82  }
83 
84  return 0;
85 }
86 
88  ScratchpadContext *sc, int linesize)
89 {
90 # define EMU_EDGE_HEIGHT (4 * 70)
91  int alloc_size = FFALIGN(FFABS(linesize) + 64, 32);
92 
93  if (avctx->hwaccel)
94  return 0;
95 
96  if (linesize < 24) {
97  av_log(avctx, AV_LOG_ERROR, "Image too small, temporary buffers cannot function\n");
98  return AVERROR_PATCHWELCOME;
99  }
100 
101  if (av_image_check_size2(alloc_size, EMU_EDGE_HEIGHT, avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx) < 0)
102  return AVERROR(ENOMEM);
103 
104  // edge emu needs blocksize + filter length - 1
105  // (= 17x17 for halfpel / 21x21 for H.264)
106  // VC-1 computes luma and chroma simultaneously and needs 19X19 + 9x9
107  // at uvlinesize. It supports only YUV420 so 24x24 is enough
108  // linesize * interlaced * MBsize
109  // we also use this buffer for encoding in encode_mb_internal() needig an additional 32 lines
110  if (!FF_ALLOCZ_TYPED_ARRAY(sc->edge_emu_buffer, alloc_size * EMU_EDGE_HEIGHT) ||
111  !FF_ALLOCZ_TYPED_ARRAY(me->scratchpad, alloc_size * 4 * 16 * 2)) {
113  return AVERROR(ENOMEM);
114  }
115 
116  me->temp = me->scratchpad;
117  sc->rd_scratchpad = me->scratchpad;
118  sc->b_scratchpad = me->scratchpad;
119  sc->obmc_scratchpad = me->scratchpad + 16;
120 
121  return 0;
122 }
123 
124 /**
125  * Allocate a frame buffer
126  */
127 static int alloc_frame_buffer(AVCodecContext *avctx, Picture *pic,
129  int chroma_x_shift, int chroma_y_shift,
130  int linesize, int uvlinesize)
131 {
132  int edges_needed = av_codec_is_encoder(avctx->codec);
133  int r, ret;
134 
135  pic->tf.f = pic->f;
136 
137  if (edges_needed) {
138  pic->f->width = avctx->width + 2 * EDGE_WIDTH;
139  pic->f->height = avctx->height + 2 * EDGE_WIDTH;
140 
141  r = ff_encode_alloc_frame(avctx, pic->f);
142  } else if (avctx->codec_id != AV_CODEC_ID_WMV3IMAGE &&
143  avctx->codec_id != AV_CODEC_ID_VC1IMAGE &&
144  avctx->codec_id != AV_CODEC_ID_MSS2) {
145  r = ff_thread_get_ext_buffer(avctx, &pic->tf,
146  pic->reference ? AV_GET_BUFFER_FLAG_REF : 0);
147  } else {
148  pic->f->width = avctx->width;
149  pic->f->height = avctx->height;
150  pic->f->format = avctx->pix_fmt;
151  r = avcodec_default_get_buffer2(avctx, pic->f, 0);
152  }
153 
154  if (r < 0 || !pic->f->buf[0]) {
155  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed (%d %p)\n",
156  r, pic->f->data[0]);
157  return -1;
158  }
159 
160  if (edges_needed) {
161  int i;
162  for (i = 0; pic->f->data[i]; i++) {
163  int offset = (EDGE_WIDTH >> (i ? chroma_y_shift : 0)) *
164  pic->f->linesize[i] +
165  (EDGE_WIDTH >> (i ? chroma_x_shift : 0));
166  pic->f->data[i] += offset;
167  }
168  pic->f->width = avctx->width;
169  pic->f->height = avctx->height;
170  }
171 
172  if (avctx->hwaccel) {
173  assert(!pic->hwaccel_picture_private);
174  if (avctx->hwaccel->frame_priv_data_size) {
176  if (!pic->hwaccel_priv_buf) {
177  av_log(avctx, AV_LOG_ERROR, "alloc_frame_buffer() failed (hwaccel private data allocation)\n");
178  return -1;
179  }
181  }
182  }
183 
184  if ((linesize && linesize != pic->f->linesize[0]) ||
185  (uvlinesize && uvlinesize != pic->f->linesize[1])) {
186  av_log(avctx, AV_LOG_ERROR,
187  "get_buffer() failed (stride changed: linesize=%d/%d uvlinesize=%d/%d)\n",
188  linesize, pic->f->linesize[0],
189  uvlinesize, pic->f->linesize[1]);
190  ff_mpeg_unref_picture(avctx, pic);
191  return -1;
192  }
193 
194  if (av_pix_fmt_count_planes(pic->f->format) > 2 &&
195  pic->f->linesize[1] != pic->f->linesize[2]) {
196  av_log(avctx, AV_LOG_ERROR,
197  "get_buffer() failed (uv stride mismatch)\n");
198  ff_mpeg_unref_picture(avctx, pic);
199  return -1;
200  }
201 
202  if (!sc->edge_emu_buffer &&
203  (ret = ff_mpeg_framesize_alloc(avctx, me, sc,
204  pic->f->linesize[0])) < 0) {
205  av_log(avctx, AV_LOG_ERROR,
206  "get_buffer() failed to allocate context scratch buffers.\n");
207  ff_mpeg_unref_picture(avctx, pic);
208  return ret;
209  }
210 
211  return 0;
212 }
213 
214 static int alloc_picture_tables(AVCodecContext *avctx, Picture *pic, int encoding, int out_format,
215  int mb_stride, int mb_width, int mb_height, int b8_stride)
216 {
217  const int big_mb_num = mb_stride * (mb_height + 1) + 1;
218  const int mb_array_size = mb_stride * mb_height;
219  const int b8_array_size = b8_stride * mb_height * 2;
220  int i;
221 
222 
223  pic->mbskip_table_buf = av_buffer_allocz(mb_array_size + 2);
224  pic->qscale_table_buf = av_buffer_allocz(big_mb_num + mb_stride);
225  pic->mb_type_buf = av_buffer_allocz((big_mb_num + mb_stride) *
226  sizeof(uint32_t));
227  if (!pic->mbskip_table_buf || !pic->qscale_table_buf || !pic->mb_type_buf)
228  return AVERROR(ENOMEM);
229 
230  if (out_format == FMT_H263 || encoding ||
232  int mv_size = 2 * (b8_array_size + 4) * sizeof(int16_t);
233  int ref_index_size = 4 * mb_array_size;
234 
235  for (i = 0; mv_size && i < 2; i++) {
236  pic->motion_val_buf[i] = av_buffer_allocz(mv_size);
237  pic->ref_index_buf[i] = av_buffer_allocz(ref_index_size);
238  if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i])
239  return AVERROR(ENOMEM);
240  }
241  }
242 
243  pic->alloc_mb_width = mb_width;
244  pic->alloc_mb_height = mb_height;
245  pic->alloc_mb_stride = mb_stride;
246 
247  return 0;
248 }
249 
250 /**
251  * Allocate a Picture.
252  * The pixels are allocated/set by calling get_buffer() if shared = 0
253  */
255  ScratchpadContext *sc, int shared, int encoding,
256  int chroma_x_shift, int chroma_y_shift, int out_format,
257  int mb_stride, int mb_width, int mb_height, int b8_stride,
258  ptrdiff_t *linesize, ptrdiff_t *uvlinesize)
259 {
260  int i, ret;
261 
262  if (pic->qscale_table_buf)
263  if ( pic->alloc_mb_width != mb_width
264  || pic->alloc_mb_height != mb_height)
265  free_picture_tables(pic);
266 
267  if (shared) {
268  av_assert0(pic->f->data[0]);
269  pic->shared = 1;
270  } else {
271  av_assert0(!pic->f->buf[0]);
272  if (alloc_frame_buffer(avctx, pic, me, sc,
273  chroma_x_shift, chroma_y_shift,
274  *linesize, *uvlinesize) < 0)
275  return -1;
276 
277  *linesize = pic->f->linesize[0];
278  *uvlinesize = pic->f->linesize[1];
279  }
280 
281  if (!pic->qscale_table_buf)
282  ret = alloc_picture_tables(avctx, pic, encoding, out_format,
283  mb_stride, mb_width, mb_height, b8_stride);
284  else
285  ret = make_tables_writable(pic);
286  if (ret < 0)
287  goto fail;
288 
289  pic->mbskip_table = pic->mbskip_table_buf->data;
290  pic->qscale_table = pic->qscale_table_buf->data + 2 * mb_stride + 1;
291  pic->mb_type = (uint32_t*)pic->mb_type_buf->data + 2 * mb_stride + 1;
292 
293  if (pic->motion_val_buf[0]) {
294  for (i = 0; i < 2; i++) {
295  pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;
296  pic->ref_index[i] = pic->ref_index_buf[i]->data;
297  }
298  }
299 
300  return 0;
301 fail:
302  av_log(avctx, AV_LOG_ERROR, "Error allocating a picture.\n");
303  ff_mpeg_unref_picture(avctx, pic);
304  free_picture_tables(pic);
305  return AVERROR(ENOMEM);
306 }
307 
308 /**
309  * Deallocate a picture; frees the picture tables in case they
310  * need to be reallocated anyway.
311  */
313 {
314  pic->tf.f = pic->f;
315  /* WM Image / Screen codecs allocate internal buffers with different
316  * dimensions / colorspaces; ignore user-defined callbacks for these. */
317  if (avctx->codec_id != AV_CODEC_ID_WMV3IMAGE &&
318  avctx->codec_id != AV_CODEC_ID_VC1IMAGE &&
319  avctx->codec_id != AV_CODEC_ID_MSS2)
320  ff_thread_release_ext_buffer(avctx, &pic->tf);
321  else if (pic->f)
322  av_frame_unref(pic->f);
323 
325 
326  if (pic->needs_realloc)
327  free_picture_tables(pic);
328 
330  pic->field_picture = 0;
331  pic->b_frame_score = 0;
332  pic->needs_realloc = 0;
333  pic->reference = 0;
334  pic->shared = 0;
335 }
336 
338 {
339  int i, ret;
340 
341  ret = av_buffer_replace(&dst->mbskip_table_buf, src->mbskip_table_buf);
342  ret |= av_buffer_replace(&dst->qscale_table_buf, src->qscale_table_buf);
343  ret |= av_buffer_replace(&dst->mb_type_buf, src->mb_type_buf);
344  for (i = 0; i < 2; i++) {
345  ret |= av_buffer_replace(&dst->motion_val_buf[i], src->motion_val_buf[i]);
346  ret |= av_buffer_replace(&dst->ref_index_buf[i], src->ref_index_buf[i]);
347  }
348 
349  if (ret < 0) {
350  free_picture_tables(dst);
351  return ret;
352  }
353 
354  dst->mbskip_table = src->mbskip_table;
355  dst->qscale_table = src->qscale_table;
356  dst->mb_type = src->mb_type;
357  for (i = 0; i < 2; i++) {
358  dst->motion_val[i] = src->motion_val[i];
359  dst->ref_index[i] = src->ref_index[i];
360  }
361 
362  dst->alloc_mb_width = src->alloc_mb_width;
363  dst->alloc_mb_height = src->alloc_mb_height;
364  dst->alloc_mb_stride = src->alloc_mb_stride;
365 
366  return 0;
367 }
368 
370 {
371  int ret;
372 
373  av_assert0(!dst->f->buf[0]);
374  av_assert0(src->f->buf[0]);
375 
376  src->tf.f = src->f;
377  dst->tf.f = dst->f;
378  ret = ff_thread_ref_frame(&dst->tf, &src->tf);
379  if (ret < 0)
380  goto fail;
381 
383  if (ret < 0)
384  goto fail;
385 
386  if (src->hwaccel_picture_private) {
387  dst->hwaccel_priv_buf = av_buffer_ref(src->hwaccel_priv_buf);
388  if (!dst->hwaccel_priv_buf) {
389  ret = AVERROR(ENOMEM);
390  goto fail;
391  }
393  }
394 
395  dst->field_picture = src->field_picture;
396  dst->b_frame_score = src->b_frame_score;
397  dst->needs_realloc = src->needs_realloc;
398  dst->reference = src->reference;
399  dst->shared = src->shared;
400 
401  return 0;
402 fail:
403  ff_mpeg_unref_picture(avctx, dst);
404  return ret;
405 }
406 
407 static inline int pic_is_unused(Picture *pic)
408 {
409  if (!pic->f->buf[0])
410  return 1;
411  if (pic->needs_realloc)
412  return 1;
413  return 0;
414 }
415 
416 static int find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
417 {
418  int i;
419 
420  if (shared) {
421  for (i = 0; i < MAX_PICTURE_COUNT; i++) {
422  if (!picture[i].f->buf[0])
423  return i;
424  }
425  } else {
426  for (i = 0; i < MAX_PICTURE_COUNT; i++) {
427  if (pic_is_unused(&picture[i]))
428  return i;
429  }
430  }
431 
432  av_log(avctx, AV_LOG_FATAL,
433  "Internal error, picture buffer overflow\n");
434  /* We could return -1, but the codec would crash trying to draw into a
435  * non-existing frame anyway. This is safer than waiting for a random crash.
436  * Also the return of this is never useful, an encoder must only allocate
437  * as much as allowed in the specification. This has no relationship to how
438  * much libavcodec could allocate (and MAX_PICTURE_COUNT is always large
439  * enough for such valid streams).
440  * Plus, a decoder has to check stream validity and remove frames if too
441  * many reference frames are around. Waiting for "OOM" is not correct at
442  * all. Similarly, missing reference frames have to be replaced by
443  * interpolated/MC frames, anything else is a bug in the codec ...
444  */
445  abort();
446  return -1;
447 }
448 
449 int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
450 {
451  int ret = find_unused_picture(avctx, picture, shared);
452 
453  if (ret >= 0 && ret < MAX_PICTURE_COUNT) {
454  if (picture[ret].needs_realloc) {
455  ff_mpeg_unref_picture(avctx, &picture[ret]);
456  }
457  }
458  return ret;
459 }
460 
462 {
463  free_picture_tables(pic);
464  ff_mpeg_unref_picture(avctx, pic);
465  av_frame_free(&pic->f);
466 }
FF_ALLOCZ_TYPED_ARRAY
#define FF_ALLOCZ_TYPED_ARRAY(p, nelem)
Definition: internal.h:97
AVCodecContext::hwaccel
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1369
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:87
r
const char * r
Definition: vf_curves.c:126
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:1178
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
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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:64
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:2898
Picture::needs_realloc
int needs_realloc
Picture needs to be reallocated (eg due to a frame size change)
Definition: mpegpicture.h:75
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:214
AVCodecContext::codec
const struct AVCodec * codec
Definition: avcodec.h:407
fail
#define fail()
Definition: checkasm.h:134
Picture::mbskip_table
uint8_t * mbskip_table
Definition: mpegpicture.h:60
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#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
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int b_frame_score
Definition: mpegpicture.h:74
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:312
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:1911
AV_CODEC_ID_VC1IMAGE
@ AV_CODEC_ID_VC1IMAGE
Definition: codec_id.h:204
Picture::hwaccel_picture_private
void * hwaccel_picture_private
Hardware accelerator private data.
Definition: mpegpicture.h:70
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enum AVCodecID codec_id
Definition: avcodec.h:408
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int ff_thread_ref_frame(ThreadFrame *dst, const ThreadFrame *src)
Definition: utils.c:885
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#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:64
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if(ret)
Definition: filter_design.txt:179
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int reference
Definition: mpegpicture.h:77
Picture::mb_type_buf
AVBufferRef * mb_type_buf
Definition: mpegpicture.h:56
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int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
Definition: mpegpicture.c:449
threadframe.h
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
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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
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int ff_update_picture_tables(Picture *dst, const Picture *src)
Definition: mpegpicture.c:337
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AVBufferRef * motion_val_buf[2]
Definition: mpegpicture.h:53
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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:254
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:127
ff_encode_alloc_frame
int ff_encode_alloc_frame(AVCodecContext *avctx, AVFrame *frame)
Allocate buffers for a frame.
Definition: encode.c:682
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:369
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
AVBufferRef::size
size_t size
Size of data in bytes.
Definition: buffer.h:94
AV_CODEC_ID_MSS2
@ AV_CODEC_ID_MSS2
Definition: codec_id.h:219
av_codec_is_encoder
int av_codec_is_encoder(const AVCodec *codec)
Definition: utils.c:75
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:282
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:461
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:1080
av_buffer_is_writable
int av_buffer_is_writable(const AVBufferRef *buf)
Definition: buffer.c:147
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:407
AVCodecContext
main external API structure.
Definition: avcodec.h:398
AVFrame::height
int height
Definition: frame.h:397
Picture::shared
int shared
Definition: mpegpicture.h:78
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:2179
ref
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:112
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:2009
find_unused_picture
static int find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
Definition: mpegpicture.c:416
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
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:203
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
make_table_writable
static int make_table_writable(AVBufferRef **ref)
Definition: mpegpicture.c:50