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options.c
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1 /*
2  * Copyright (c) 2001 Fabrice Bellard
3  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Options definition for AVCodecContext.
25  */
26 
27 #include "avcodec.h"
28 #include "internal.h"
29 #include "libavutil/avassert.h"
30 #include "libavutil/internal.h"
31 #include "libavutil/mem.h"
32 #include "libavutil/opt.h"
33 #include <float.h> /* FLT_MIN, FLT_MAX */
34 #include <string.h>
35 
36 #include "options_table.h"
37 
38 static const char* context_to_name(void* ptr) {
39  AVCodecContext *avc= ptr;
40 
41  if(avc && avc->codec && avc->codec->name)
42  return avc->codec->name;
43  else
44  return "NULL";
45 }
46 
47 static void *codec_child_next(void *obj, void *prev)
48 {
49  AVCodecContext *s = obj;
50  if (!prev && s->codec && s->codec->priv_class && s->priv_data)
51  return s->priv_data;
52  return NULL;
53 }
54 
55 static const AVClass *codec_child_class_next(const AVClass *prev)
56 {
57  AVCodec *c = NULL;
58 
59  /* find the codec that corresponds to prev */
60  while (prev && (c = av_codec_next(c)))
61  if (c->priv_class == prev)
62  break;
63 
64  /* find next codec with priv options */
65  while (c = av_codec_next(c))
66  if (c->priv_class)
67  return c->priv_class;
68  return NULL;
69 }
70 
71 static AVClassCategory get_category(void *ptr)
72 {
73  AVCodecContext* avctx = ptr;
74  if(avctx->codec && avctx->codec->decode) return AV_CLASS_CATEGORY_DECODER;
75  else return AV_CLASS_CATEGORY_ENCODER;
76 }
77 
79  .class_name = "AVCodecContext",
80  .item_name = context_to_name,
81  .option = avcodec_options,
82  .version = LIBAVUTIL_VERSION_INT,
83  .log_level_offset_offset = offsetof(AVCodecContext, log_level_offset),
84  .child_next = codec_child_next,
85  .child_class_next = codec_child_class_next,
87  .get_category = get_category,
88 };
89 
91 {
92  int flags=0;
93  memset(s, 0, sizeof(AVCodecContext));
94 
96 
97  s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN;
98  if (codec) {
99  s->codec = codec;
100  s->codec_id = codec->id;
101  }
102 
105  else if(s->codec_type == AVMEDIA_TYPE_VIDEO)
107  else if(s->codec_type == AVMEDIA_TYPE_SUBTITLE)
109  av_opt_set_defaults2(s, flags, flags);
110 
111  s->time_base = (AVRational){0,1};
112  s->framerate = (AVRational){ 0, 1 };
113  s->pkt_timebase = (AVRational){ 0, 1 };
118  s->sample_aspect_ratio = (AVRational){0,1};
121 
123  if(codec && codec->priv_data_size){
124  if(!s->priv_data){
125  s->priv_data= av_mallocz(codec->priv_data_size);
126  if (!s->priv_data) {
127  return AVERROR(ENOMEM);
128  }
129  }
130  if(codec->priv_class){
131  *(const AVClass**)s->priv_data = codec->priv_class;
133  }
134  }
135  if (codec && codec->defaults) {
136  int ret;
137  const AVCodecDefault *d = codec->defaults;
138  while (d->key) {
139  ret = av_opt_set(s, d->key, d->value, 0);
140  av_assert0(ret >= 0);
141  d++;
142  }
143  }
144  return 0;
145 }
146 
148 {
149  AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
150 
151  if (!avctx)
152  return NULL;
153 
154  if(avcodec_get_context_defaults3(avctx, codec) < 0){
155  av_free(avctx);
156  return NULL;
157  }
158 
159  return avctx;
160 }
161 
163 {
164  AVCodecContext *avctx = *pavctx;
165 
166  if (!avctx)
167  return;
168 
169  avcodec_close(avctx);
170 
171  av_freep(&avctx->extradata);
172  av_freep(&avctx->subtitle_header);
173  av_freep(&avctx->intra_matrix);
174  av_freep(&avctx->inter_matrix);
175  av_freep(&avctx->rc_override);
176 
177  av_freep(pavctx);
178 }
179 
181 {
182  const AVCodec *orig_codec = dest->codec;
183  uint8_t *orig_priv_data = dest->priv_data;
184 
185  if (avcodec_is_open(dest)) { // check that the dest context is uninitialized
186  av_log(dest, AV_LOG_ERROR,
187  "Tried to copy AVCodecContext %p into already-initialized %p\n",
188  src, dest);
189  return AVERROR(EINVAL);
190  }
191 
192  av_opt_free(dest);
193  av_freep(&dest->rc_override);
194  av_freep(&dest->intra_matrix);
195  av_freep(&dest->inter_matrix);
196  av_freep(&dest->extradata);
197  av_freep(&dest->subtitle_header);
198 
199  memcpy(dest, src, sizeof(*dest));
200  av_opt_copy(dest, src);
201 
202  dest->priv_data = orig_priv_data;
203  dest->codec = orig_codec;
204 
205  if (orig_priv_data && src->codec && src->codec->priv_class &&
206  dest->codec && dest->codec->priv_class)
207  av_opt_copy(orig_priv_data, src->priv_data);
208 
209 
210  /* set values specific to opened codecs back to their default state */
211  dest->slice_offset = NULL;
212  dest->hwaccel = NULL;
213  dest->internal = NULL;
214  dest->coded_frame = NULL;
215 
216  /* reallocate values that should be allocated separately */
217  dest->extradata = NULL;
218  dest->intra_matrix = NULL;
219  dest->inter_matrix = NULL;
220  dest->rc_override = NULL;
221  dest->subtitle_header = NULL;
222 
223 #define alloc_and_copy_or_fail(obj, size, pad) \
224  if (src->obj && size > 0) { \
225  dest->obj = av_malloc(size + pad); \
226  if (!dest->obj) \
227  goto fail; \
228  memcpy(dest->obj, src->obj, size); \
229  if (pad) \
230  memset(((uint8_t *) dest->obj) + size, 0, pad); \
231  }
232  alloc_and_copy_or_fail(extradata, src->extradata_size,
234  dest->extradata_size = src->extradata_size;
235  alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0);
236  alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0);
237  alloc_and_copy_or_fail(rc_override, src->rc_override_count * sizeof(*src->rc_override), 0);
238  alloc_and_copy_or_fail(subtitle_header, src->subtitle_header_size, 1);
240 #undef alloc_and_copy_or_fail
241 
242  return 0;
243 
244 fail:
245  av_freep(&dest->rc_override);
246  av_freep(&dest->intra_matrix);
247  av_freep(&dest->inter_matrix);
248  av_freep(&dest->extradata);
249  av_freep(&dest->subtitle_header);
250  dest->subtitle_header_size = 0;
251  dest->extradata_size = 0;
252  av_opt_free(dest);
253  return AVERROR(ENOMEM);
254 }
255 
257 {
258  return &av_codec_context_class;
259 }
260 
261 #define FOFFSET(x) offsetof(AVFrame,x)
262 
263 static const AVOption frame_options[]={
264 {"best_effort_timestamp", "", FOFFSET(best_effort_timestamp), AV_OPT_TYPE_INT64, {.i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, 0},
265 {"pkt_pos", "", FOFFSET(pkt_pos), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
266 {"pkt_size", "", FOFFSET(pkt_size), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
267 {"sample_aspect_ratio", "", FOFFSET(sample_aspect_ratio), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, 0, INT_MAX, 0},
268 {"width", "", FOFFSET(width), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
269 {"height", "", FOFFSET(height), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
270 {"format", "", FOFFSET(format), AV_OPT_TYPE_INT, {.i64 = -1 }, 0, INT_MAX, 0},
271 {"channel_layout", "", FOFFSET(channel_layout), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, 0},
272 {"sample_rate", "", FOFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
273 {NULL},
274 };
275 
276 static const AVClass av_frame_class = {
277  .class_name = "AVFrame",
278  .item_name = NULL,
279  .option = frame_options,
280  .version = LIBAVUTIL_VERSION_INT,
281 };
282 
284 {
285  return &av_frame_class;
286 }
287 
288 #define SROFFSET(x) offsetof(AVSubtitleRect,x)
289 
291 {"x", "", SROFFSET(x), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
292 {"y", "", SROFFSET(y), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
293 {"w", "", SROFFSET(w), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
294 {"h", "", SROFFSET(h), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
295 {"type", "", SROFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
296 {"flags", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0, "flags"},
297 {"forced", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0},
298 {NULL},
299 };
300 
302  .class_name = "AVSubtitleRect",
303  .item_name = NULL,
304  .option = subtitle_rect_options,
305  .version = LIBAVUTIL_VERSION_INT,
306 };
307 
309 {
310  return &av_subtitle_rect_class;
311 }
312 
313 #ifdef TEST
314 static int dummy_init(AVCodecContext *ctx)
315 {
316  //TODO: this code should set every possible pointer that could be set by codec and is not an option;
317  ctx->extradata_size = 8;
318  ctx->extradata = av_malloc(ctx->extradata_size);
319  ctx->coded_frame = av_frame_alloc();
320  return 0;
321 }
322 
323 static int dummy_close(AVCodecContext *ctx)
324 {
325  av_freep(&ctx->extradata);
326  ctx->extradata_size = 0;
327  av_frame_free(&ctx->coded_frame);
328  return 0;
329 }
330 
331 static int dummy_encode(AVCodecContext *ctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
332 {
333  return AVERROR(ENOSYS);
334 }
335 
336 typedef struct Dummy12Context {
337  AVClass *av_class;
338  int num;
339  char* str;
340 } Dummy12Context;
341 
342 typedef struct Dummy3Context {
343  void *fake_av_class;
344  int num;
345  char* str;
346 } Dummy3Context;
347 
348 #define OFFSET(x) offsetof(Dummy12Context, x)
349 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
350 static const AVOption dummy_options[] = {
351  { "str", "set str", OFFSET(str), AV_OPT_TYPE_STRING, { .str = "i'm src default value" }, 0, 0, VE},
352  { "num", "set num", OFFSET(num), AV_OPT_TYPE_INT, { .i64 = 1500100900 }, 0, INT_MAX, VE},
353  { NULL },
354 };
355 
356 static const AVClass dummy_v1_class = {
357  .class_name = "dummy_v1_class",
358  .item_name = av_default_item_name,
359  .option = dummy_options,
360  .version = LIBAVUTIL_VERSION_INT,
361 };
362 
363 static const AVClass dummy_v2_class = {
364  .class_name = "dummy_v2_class",
365  .item_name = av_default_item_name,
366  .option = dummy_options,
367  .version = LIBAVUTIL_VERSION_INT,
368 };
369 
370 /* codec with options */
371 AVCodec dummy_v1_encoder = {
372  .name = "dummy_v1_codec",
373  .type = AVMEDIA_TYPE_VIDEO,
374  .id = AV_CODEC_ID_NONE - 1,
375  .encode2 = dummy_encode,
376  .init = dummy_init,
377  .close = dummy_close,
378  .priv_class = &dummy_v1_class,
379  .priv_data_size = sizeof(Dummy12Context),
380 };
381 
382 /* codec with options, different class */
383 AVCodec dummy_v2_encoder = {
384  .name = "dummy_v2_codec",
385  .type = AVMEDIA_TYPE_VIDEO,
386  .id = AV_CODEC_ID_NONE - 2,
387  .encode2 = dummy_encode,
388  .init = dummy_init,
389  .close = dummy_close,
390  .priv_class = &dummy_v2_class,
391  .priv_data_size = sizeof(Dummy12Context),
392 };
393 
394 /* codec with priv data, but no class */
395 AVCodec dummy_v3_encoder = {
396  .name = "dummy_v3_codec",
397  .type = AVMEDIA_TYPE_VIDEO,
398  .id = AV_CODEC_ID_NONE - 3,
399  .encode2 = dummy_encode,
400  .init = dummy_init,
401  .close = dummy_close,
402  .priv_data_size = sizeof(Dummy3Context),
403 };
404 
405 /* codec without priv data */
406 AVCodec dummy_v4_encoder = {
407  .name = "dummy_v4_codec",
408  .type = AVMEDIA_TYPE_VIDEO,
409  .id = AV_CODEC_ID_NONE - 4,
410  .encode2 = dummy_encode,
411  .init = dummy_init,
412  .close = dummy_close,
413 };
414 
415 static void test_copy_print_codec(const AVCodecContext *ctx)
416 {
417  printf("%-14s: %dx%d prv: %s",
418  ctx->codec ? ctx->codec->name : "NULL",
419  ctx->width, ctx->height,
420  ctx->priv_data ? "set" : "null");
421  if (ctx->codec && ctx->codec->priv_class && ctx->codec->priv_data_size) {
422  int64_t i64;
423  char *str = NULL;
424  av_opt_get_int(ctx->priv_data, "num", 0, &i64);
425  av_opt_get(ctx->priv_data, "str", 0, (uint8_t**)&str);
426  printf(" opts: %"PRId64" %s", i64, str);
427  av_free(str);
428  }
429  printf("\n");
430 }
431 
432 static void test_copy(const AVCodec *c1, const AVCodec *c2)
433 {
434  AVCodecContext *ctx1, *ctx2;
435  printf("%s -> %s\nclosed:\n", c1 ? c1->name : "NULL", c2 ? c2->name : "NULL");
436  ctx1 = avcodec_alloc_context3(c1);
437  ctx2 = avcodec_alloc_context3(c2);
438  ctx1->width = ctx1->height = 128;
439  if (ctx2->codec && ctx2->codec->priv_class && ctx2->codec->priv_data_size) {
440  av_opt_set(ctx2->priv_data, "num", "667", 0);
441  av_opt_set(ctx2->priv_data, "str", "i'm dest value before copy", 0);
442  }
443  avcodec_copy_context(ctx2, ctx1);
444  test_copy_print_codec(ctx1);
445  test_copy_print_codec(ctx2);
446  if (ctx1->codec) {
447  printf("opened:\n");
448  avcodec_open2(ctx1, ctx1->codec, NULL);
449  if (ctx2->codec && ctx2->codec->priv_class && ctx2->codec->priv_data_size) {
450  av_opt_set(ctx2->priv_data, "num", "667", 0);
451  av_opt_set(ctx2->priv_data, "str", "i'm dest value before copy", 0);
452  }
453  avcodec_copy_context(ctx2, ctx1);
454  test_copy_print_codec(ctx1);
455  test_copy_print_codec(ctx2);
456  avcodec_close(ctx1);
457  }
458  avcodec_free_context(&ctx1);
459  avcodec_free_context(&ctx2);
460 }
461 
462 int main(void)
463 {
464  AVCodec *dummy_codec[] = {
465  &dummy_v1_encoder,
466  &dummy_v2_encoder,
467  &dummy_v3_encoder,
468  &dummy_v4_encoder,
469  NULL,
470  };
471  int i, j;
472 
473  for (i = 0; dummy_codec[i]; i++)
474  avcodec_register(dummy_codec[i]);
475 
476  printf("testing avcodec_copy_context()\n");
477  for (i = 0; i < FF_ARRAY_ELEMS(dummy_codec); i++)
478  for (j = 0; j < FF_ARRAY_ELEMS(dummy_codec); j++)
479  test_copy(dummy_codec[i], dummy_codec[j]);
480  return 0;
481 }
482 #endif
#define NULL
Definition: coverity.c:32
const struct AVCodec * codec
Definition: avcodec.h:1261
AVRational framerate
Definition: avcodec.h:3049
const char * s
Definition: avisynth_c.h:631
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
int avcodec_default_execute2(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2, int, int), void *arg, int *ret, int count)
AVOption.
Definition: opt.h:255
#define AV_OPT_FLAG_SUBTITLE_PARAM
Definition: opt.h:292
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
memory handling functions
AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2772
void av_opt_set_defaults(void *s)
Set the values of all AVOption fields to their default values.
Definition: opt.c:1178
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:290
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:1650
static const AVOption avcodec_options[]
Definition: options_table.h:44
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1471
enum AVMediaType type
Definition: avcodec.h:3220
#define FF_ARRAY_ELEMS(a)
int(* decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt)
Definition: avcodec.h:3292
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3207
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
Copy the settings of the source AVCodecContext into the destination AVCodecContext.
Definition: options.c:180
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1380
const AVClass * avcodec_get_class(void)
Get the AVClass for AVCodecContext.
Definition: options.c:256
static const AVClass av_codec_context_class
Definition: options.c:78
struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2671
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
Definition: utils.c:1146
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2020
uint8_t
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:135
static const AVOption subtitle_rect_options[]
Definition: options.c:290
AVOptions.
int subtitle_header_size
Definition: avcodec.h:2984
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1366
const AVClass * av_class
information on struct for av_log
Definition: avcodec.h:1257
static AVFrame * frame
static const AVClass av_subtitle_rect_class
Definition: options.c:301
static const uint64_t c1
Definition: murmur3.c:49
const AVClass * avcodec_get_frame_class(void)
Get the AVClass for AVFrame.
Definition: options.c:283
#define av_log(a,...)
int avcodec_close(AVCodecContext *avctx)
Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...
Definition: utils.c:2850
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
Definition: avcodec.h:3065
enum AVCodecID id
Definition: avcodec.h:3221
const AVCodecDefault * defaults
Private codec-specific defaults.
Definition: avcodec.h:3270
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:148
AVCodec * av_codec_next(const AVCodec *c)
If c is NULL, returns the first registered codec, if c is non-NULL, returns the next registered codec...
Definition: utils.c:167
int avcodec_is_open(AVCodecContext *s)
Definition: utils.c:3792
#define OFFSET(x)
Definition: options.c:35
static void * codec_child_next(void *obj, void *prev)
Definition: options.c:47
simple assert() macros that are a bit more flexible than ISO C assert().
const char * name
Name of the codec implementation.
Definition: avcodec.h:3214
AVClassCategory category
Category used for visualization (like color) This is only set if the category is equal for all object...
Definition: log.h:130
Libavcodec external API header.
static const char * context_to_name(void *ptr)
Definition: options.c:38
common internal API header
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:635
int rc_override_count
ratecontrol override, see RcOverride
Definition: avcodec.h:2338
int av_opt_copy(void *dst, FF_CONST_AVUTIL55 void *src)
Copy options from src object into dest object.
Definition: opt.c:1579
float y
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:147
ret
Definition: avfilter.c:974
int width
picture width / height.
Definition: avcodec.h:1430
int priv_data_size
Definition: avcodec.h:3245
static const AVClass * codec_child_class_next(const AVClass *prev)
Definition: options.c:55
const AVClass * avcodec_get_subtitle_rect_class(void)
Get the AVClass for AVSubtitleRect.
Definition: options.c:308
int64_t reordered_opaque
opaque 64bit number (generally a PTS) that will be reordered and output in AVFrame.reordered_opaque
Definition: avcodec.h:2664
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:193
RcOverride * rc_override
Definition: avcodec.h:2339
int av_opt_get_int(void *obj, const char *name, int search_flags, int64_t *out_val)
Definition: opt.c:823
sample_rate
AVS_Value src
Definition: avisynth_c.h:482
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags)
The default callback for AVCodecContext.get_buffer2().
Definition: utils.c:719
#define SROFFSET(x)
Definition: options.c:288
enum AVMediaType codec_type
Definition: avcodec.h:1260
void avcodec_free_context(AVCodecContext **pavctx)
Free the codec context and everything associated with it and write NULL to the provided pointer...
Definition: options.c:162
enum AVCodecID codec_id
Definition: avcodec.h:1269
#define AV_OPT_FLAG_VIDEO_PARAM
Definition: opt.h:291
main external API structure.
Definition: avcodec.h:1252
GLint GLenum type
Definition: opengl_enc.c:105
int extradata_size
Definition: avcodec.h:1367
static const AVClass av_class
Definition: options.c:133
uint16_t * intra_matrix
custom intra quantization matrix
Definition: avcodec.h:1814
BYTE int const BYTE int int int height
Definition: avisynth_c.h:676
Describe the class of an AVClass context structure.
Definition: log.h:67
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
callback to negotiate the pixelFormat
Definition: avcodec.h:1522
rational number numerator/denominator
Definition: rational.h:43
int(* get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags)
This callback is called at the beginning of each frame to get data buffer(s) for it.
Definition: avcodec.h:2273
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: utils.c:1337
uint16_t * inter_matrix
custom inter quantization matrix
Definition: avcodec.h:1821
static int flags
Definition: cpu.c:47
const AVClass * priv_class
AVClass for the private context.
Definition: avcodec.h:3235
const uint8_t * key
Definition: internal.h:165
const uint8_t * value
Definition: internal.h:166
void av_opt_free(void *obj)
Free all allocated objects in obj.
Definition: opt.c:1435
static const AVOption frame_options[]
Definition: options.c:263
common internal api header.
static double c[64]
static AVClassCategory get_category(void *ptr)
Definition: options.c:71
static const uint64_t c2
Definition: murmur3.c:50
static const AVClass av_frame_class
Definition: options.c:276
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
Set the fields of the given AVCodecContext to default values corresponding to the given codec (defaul...
Definition: options.c:90
void * priv_data
Definition: avcodec.h:1294
int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
Definition: opt.c:689
#define av_free(p)
AVClassCategory
Definition: log.h:29
int(* execute)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size)
The codec may call this to execute several independent things.
Definition: avcodec.h:2820
#define alloc_and_copy_or_fail(obj, size, pad)
int(* execute2)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count)
The codec may call this to execute several independent things.
Definition: avcodec.h:2840
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1302
void avcodec_register(AVCodec *codec)
Register the codec codec and initialize libavcodec.
Definition: utils.c:197
int * slice_offset
slice offsets in the frame in bytes
Definition: avcodec.h:1641
#define av_freep(p)
int main(int argc, char **argv)
Definition: main.c:22
This structure stores compressed data.
Definition: avcodec.h:1150
void av_opt_set_defaults2(void *s, int mask, int flags)
Definition: opt.c:1184
int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
Definition: opt.c:369
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:250
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:241
#define FOFFSET(x)
Definition: options.c:261
int avcodec_default_execute(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
Definition: utils.c:1105
uint8_t * subtitle_header
Header containing style information for text subtitles.
Definition: avcodec.h:2983
static int width
#define VE
Definition: options.c:34