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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 
37 #include "options_table.h"
39 
40 static const char* context_to_name(void* ptr) {
41  AVCodecContext *avc= ptr;
42 
43  if(avc && avc->codec && avc->codec->name)
44  return avc->codec->name;
45  else
46  return "NULL";
47 }
48 
49 static void *codec_child_next(void *obj, void *prev)
50 {
51  AVCodecContext *s = obj;
52  if (!prev && s->codec && s->codec->priv_class && s->priv_data)
53  return s->priv_data;
54  return NULL;
55 }
56 
57 static const AVClass *codec_child_class_next(const AVClass *prev)
58 {
59  AVCodec *c = NULL;
60 
61  /* find the codec that corresponds to prev */
62  while (prev && (c = av_codec_next(c)))
63  if (c->priv_class == prev)
64  break;
65 
66  /* find next codec with priv options */
67  while (c = av_codec_next(c))
68  if (c->priv_class)
69  return c->priv_class;
70  return NULL;
71 }
72 
73 static AVClassCategory get_category(void *ptr)
74 {
75  AVCodecContext* avctx = ptr;
76  if(avctx->codec && avctx->codec->decode) return AV_CLASS_CATEGORY_DECODER;
77  else return AV_CLASS_CATEGORY_ENCODER;
78 }
79 
81  .class_name = "AVCodecContext",
82  .item_name = context_to_name,
83  .option = avcodec_options,
84  .version = LIBAVUTIL_VERSION_INT,
85  .log_level_offset_offset = offsetof(AVCodecContext, log_level_offset),
86  .child_next = codec_child_next,
87  .child_class_next = codec_child_class_next,
89  .get_category = get_category,
90 };
91 
92 static int init_context_defaults(AVCodecContext *s, const AVCodec *codec)
93 {
94  int flags=0;
95  memset(s, 0, sizeof(AVCodecContext));
96 
98 
99  s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN;
100  if (codec) {
101  s->codec = codec;
102  s->codec_id = codec->id;
103  }
104 
107  else if(s->codec_type == AVMEDIA_TYPE_VIDEO)
109  else if(s->codec_type == AVMEDIA_TYPE_SUBTITLE)
111  av_opt_set_defaults2(s, flags, flags);
112 
113  s->time_base = (AVRational){0,1};
114  s->framerate = (AVRational){ 0, 1 };
115  s->pkt_timebase = (AVRational){ 0, 1 };
120  s->sample_aspect_ratio = (AVRational){0,1};
124 
126  if(codec && codec->priv_data_size){
127  if(!s->priv_data){
128  s->priv_data= av_mallocz(codec->priv_data_size);
129  if (!s->priv_data) {
130  return AVERROR(ENOMEM);
131  }
132  }
133  if(codec->priv_class){
134  *(const AVClass**)s->priv_data = codec->priv_class;
136  }
137  }
138  if (codec && codec->defaults) {
139  int ret;
140  const AVCodecDefault *d = codec->defaults;
141  while (d->key) {
142  ret = av_opt_set(s, d->key, d->value, 0);
143  av_assert0(ret >= 0);
144  d++;
145  }
146  }
147  return 0;
148 }
149 
150 #if FF_API_GET_CONTEXT_DEFAULTS
152 {
153  return init_context_defaults(s, codec);
154 }
155 #endif
156 
158 {
159  AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
160 
161  if (!avctx)
162  return NULL;
163 
164  if (init_context_defaults(avctx, codec) < 0) {
165  av_free(avctx);
166  return NULL;
167  }
168 
169  return avctx;
170 }
171 
173 {
174  AVCodecContext *avctx = *pavctx;
175 
176  if (!avctx)
177  return;
178 
179  avcodec_close(avctx);
180 
181  av_freep(&avctx->extradata);
182  av_freep(&avctx->subtitle_header);
183  av_freep(&avctx->intra_matrix);
184  av_freep(&avctx->inter_matrix);
185  av_freep(&avctx->rc_override);
186 
187  av_freep(pavctx);
188 }
189 
190 #if FF_API_COPY_CONTEXT
192 {
193  int i;
194 
195  av_opt_free(avctx);
196 #if FF_API_CODED_FRAME
198  av_frame_free(&avctx->coded_frame);
200 #endif
201  av_freep(&avctx->rc_override);
202  av_freep(&avctx->intra_matrix);
203  av_freep(&avctx->inter_matrix);
204  av_freep(&avctx->extradata);
205  av_freep(&avctx->subtitle_header);
208  for (i = 0; i < avctx->nb_coded_side_data; i++)
209  av_freep(&avctx->coded_side_data[i].data);
210  av_freep(&avctx->coded_side_data);
211  avctx->subtitle_header_size = 0;
212  avctx->nb_coded_side_data = 0;
213  avctx->extradata_size = 0;
214 }
215 
217 {
218  const AVCodec *orig_codec = dest->codec;
219  uint8_t *orig_priv_data = dest->priv_data;
220 
221  if (avcodec_is_open(dest)) { // check that the dest context is uninitialized
222  av_log(dest, AV_LOG_ERROR,
223  "Tried to copy AVCodecContext %p into already-initialized %p\n",
224  src, dest);
225  return AVERROR(EINVAL);
226  }
227 
228  copy_context_reset(dest);
229 
230  memcpy(dest, src, sizeof(*dest));
231  av_opt_copy(dest, src);
232 
233  dest->priv_data = orig_priv_data;
234  dest->codec = orig_codec;
235 
236  if (orig_priv_data && src->codec && src->codec->priv_class &&
237  dest->codec && dest->codec->priv_class)
238  av_opt_copy(orig_priv_data, src->priv_data);
239 
240 
241  /* set values specific to opened codecs back to their default state */
242  dest->slice_offset = NULL;
243  dest->hwaccel = NULL;
244  dest->internal = NULL;
245 #if FF_API_CODED_FRAME
247  dest->coded_frame = NULL;
249 #endif
250 
251  /* reallocate values that should be allocated separately */
252  dest->extradata = NULL;
253  dest->coded_side_data = NULL;
254  dest->intra_matrix = NULL;
255  dest->inter_matrix = NULL;
256  dest->rc_override = NULL;
257  dest->subtitle_header = NULL;
258  dest->hw_frames_ctx = NULL;
259  dest->hw_device_ctx = NULL;
260  dest->nb_coded_side_data = 0;
261 
262 #define alloc_and_copy_or_fail(obj, size, pad) \
263  if (src->obj && size > 0) { \
264  dest->obj = av_malloc(size + pad); \
265  if (!dest->obj) \
266  goto fail; \
267  memcpy(dest->obj, src->obj, size); \
268  if (pad) \
269  memset(((uint8_t *) dest->obj) + size, 0, pad); \
270  }
271  alloc_and_copy_or_fail(extradata, src->extradata_size,
273  dest->extradata_size = src->extradata_size;
274  alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0);
275  alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0);
276  alloc_and_copy_or_fail(rc_override, src->rc_override_count * sizeof(*src->rc_override), 0);
277  alloc_and_copy_or_fail(subtitle_header, src->subtitle_header_size, 1);
279 #undef alloc_and_copy_or_fail
280 
281  if (src->hw_frames_ctx) {
283  if (!dest->hw_frames_ctx)
284  goto fail;
285  }
286 
287  return 0;
288 
289 fail:
290  copy_context_reset(dest);
291  return AVERROR(ENOMEM);
292 }
293 #endif
294 
296 {
297  return &av_codec_context_class;
298 }
299 
300 #define FOFFSET(x) offsetof(AVFrame,x)
301 
302 static const AVOption frame_options[]={
303 {"best_effort_timestamp", "", FOFFSET(best_effort_timestamp), AV_OPT_TYPE_INT64, {.i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, 0},
304 {"pkt_pos", "", FOFFSET(pkt_pos), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
305 {"pkt_size", "", FOFFSET(pkt_size), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
306 {"sample_aspect_ratio", "", FOFFSET(sample_aspect_ratio), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, 0, INT_MAX, 0},
307 {"width", "", FOFFSET(width), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
308 {"height", "", FOFFSET(height), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
309 {"format", "", FOFFSET(format), AV_OPT_TYPE_INT, {.i64 = -1 }, 0, INT_MAX, 0},
310 {"channel_layout", "", FOFFSET(channel_layout), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, 0},
311 {"sample_rate", "", FOFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
312 {NULL},
313 };
314 
315 static const AVClass av_frame_class = {
316  .class_name = "AVFrame",
317  .item_name = NULL,
318  .option = frame_options,
319  .version = LIBAVUTIL_VERSION_INT,
320 };
321 
323 {
324  return &av_frame_class;
325 }
326 
327 #define SROFFSET(x) offsetof(AVSubtitleRect,x)
328 
330 {"x", "", SROFFSET(x), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
331 {"y", "", SROFFSET(y), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
332 {"w", "", SROFFSET(w), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
333 {"h", "", SROFFSET(h), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
334 {"type", "", SROFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
335 {"flags", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0, "flags"},
336 {"forced", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0},
337 {NULL},
338 };
339 
341  .class_name = "AVSubtitleRect",
342  .item_name = NULL,
343  .option = subtitle_rect_options,
344  .version = LIBAVUTIL_VERSION_INT,
345 };
346 
348 {
349  return &av_subtitle_rect_class;
350 }
351 
352 #ifdef TEST
353 static int dummy_init(AVCodecContext *ctx)
354 {
355  //TODO: this code should set every possible pointer that could be set by codec and is not an option;
356  ctx->extradata_size = 8;
357  ctx->extradata = av_malloc(ctx->extradata_size);
358  return 0;
359 }
360 
361 static int dummy_close(AVCodecContext *ctx)
362 {
363  av_freep(&ctx->extradata);
364  ctx->extradata_size = 0;
365  return 0;
366 }
367 
368 static int dummy_encode(AVCodecContext *ctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
369 {
370  return AVERROR(ENOSYS);
371 }
372 
373 typedef struct Dummy12Context {
374  AVClass *av_class;
375  int num;
376  char* str;
378 
379 typedef struct Dummy3Context {
380  void *fake_av_class;
381  int num;
382  char* str;
383 } Dummy3Context;
384 
385 #define OFFSET(x) offsetof(Dummy12Context, x)
386 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
387 static const AVOption dummy_options[] = {
388  { "str", "set str", OFFSET(str), AV_OPT_TYPE_STRING, { .str = "i'm src default value" }, 0, 0, VE},
389  { "num", "set num", OFFSET(num), AV_OPT_TYPE_INT, { .i64 = 1500100900 }, 0, INT_MAX, VE},
390  { NULL },
391 };
392 
393 static const AVClass dummy_v1_class = {
394  .class_name = "dummy_v1_class",
395  .item_name = av_default_item_name,
396  .option = dummy_options,
397  .version = LIBAVUTIL_VERSION_INT,
398 };
399 
400 static const AVClass dummy_v2_class = {
401  .class_name = "dummy_v2_class",
402  .item_name = av_default_item_name,
403  .option = dummy_options,
404  .version = LIBAVUTIL_VERSION_INT,
405 };
406 
407 /* codec with options */
408 static AVCodec dummy_v1_encoder = {
409  .name = "dummy_v1_codec",
410  .type = AVMEDIA_TYPE_VIDEO,
411  .id = AV_CODEC_ID_NONE - 1,
412  .encode2 = dummy_encode,
413  .init = dummy_init,
414  .close = dummy_close,
415  .priv_class = &dummy_v1_class,
416  .priv_data_size = sizeof(Dummy12Context),
417 };
418 
419 /* codec with options, different class */
420 static AVCodec dummy_v2_encoder = {
421  .name = "dummy_v2_codec",
422  .type = AVMEDIA_TYPE_VIDEO,
423  .id = AV_CODEC_ID_NONE - 2,
424  .encode2 = dummy_encode,
425  .init = dummy_init,
426  .close = dummy_close,
427  .priv_class = &dummy_v2_class,
428  .priv_data_size = sizeof(Dummy12Context),
429 };
430 
431 /* codec with priv data, but no class */
432 static AVCodec dummy_v3_encoder = {
433  .name = "dummy_v3_codec",
434  .type = AVMEDIA_TYPE_VIDEO,
435  .id = AV_CODEC_ID_NONE - 3,
436  .encode2 = dummy_encode,
437  .init = dummy_init,
438  .close = dummy_close,
439  .priv_data_size = sizeof(Dummy3Context),
440 };
441 
442 /* codec without priv data */
443 static AVCodec dummy_v4_encoder = {
444  .name = "dummy_v4_codec",
445  .type = AVMEDIA_TYPE_VIDEO,
446  .id = AV_CODEC_ID_NONE - 4,
447  .encode2 = dummy_encode,
448  .init = dummy_init,
449  .close = dummy_close,
450 };
451 
452 static void test_copy_print_codec(const AVCodecContext *ctx)
453 {
454  printf("%-14s: %dx%d prv: %s",
455  ctx->codec ? ctx->codec->name : "NULL",
456  ctx->width, ctx->height,
457  ctx->priv_data ? "set" : "null");
458  if (ctx->codec && ctx->codec->priv_class && ctx->codec->priv_data_size) {
459  int64_t i64;
460  char *str = NULL;
461  av_opt_get_int(ctx->priv_data, "num", 0, &i64);
462  av_opt_get(ctx->priv_data, "str", 0, (uint8_t**)&str);
463  printf(" opts: %"PRId64" %s", i64, str);
464  av_free(str);
465  }
466  printf("\n");
467 }
468 
469 static void test_copy(const AVCodec *c1, const AVCodec *c2)
470 {
471  AVCodecContext *ctx1, *ctx2;
472  printf("%s -> %s\nclosed:\n", c1 ? c1->name : "NULL", c2 ? c2->name : "NULL");
473  ctx1 = avcodec_alloc_context3(c1);
474  ctx2 = avcodec_alloc_context3(c2);
475  ctx1->width = ctx1->height = 128;
476  if (ctx2->codec && ctx2->codec->priv_class && ctx2->codec->priv_data_size) {
477  av_opt_set(ctx2->priv_data, "num", "667", 0);
478  av_opt_set(ctx2->priv_data, "str", "i'm dest value before copy", 0);
479  }
480  avcodec_copy_context(ctx2, ctx1);
481  test_copy_print_codec(ctx1);
482  test_copy_print_codec(ctx2);
483  if (ctx1->codec) {
484  printf("opened:\n");
485  avcodec_open2(ctx1, ctx1->codec, NULL);
486  if (ctx2->codec && ctx2->codec->priv_class && ctx2->codec->priv_data_size) {
487  av_opt_set(ctx2->priv_data, "num", "667", 0);
488  av_opt_set(ctx2->priv_data, "str", "i'm dest value before copy", 0);
489  }
490  avcodec_copy_context(ctx2, ctx1);
491  test_copy_print_codec(ctx1);
492  test_copy_print_codec(ctx2);
493  avcodec_close(ctx1);
494  }
495  avcodec_free_context(&ctx1);
496  avcodec_free_context(&ctx2);
497 }
498 
499 int main(void)
500 {
501  AVCodec *dummy_codec[] = {
506  NULL,
507  };
508  int i, j;
509 
510  for (i = 0; dummy_codec[i]; i++)
511  avcodec_register(dummy_codec[i]);
512 
513  printf("testing avcodec_copy_context()\n");
514  for (i = 0; i < FF_ARRAY_ELEMS(dummy_codec); i++)
515  for (j = 0; j < FF_ARRAY_ELEMS(dummy_codec); j++)
516  test_copy(dummy_codec[i], dummy_codec[j]);
517  return 0;
518 }
519 #endif
#define NULL
Definition: coverity.c:32
const struct AVCodec * codec
Definition: avcodec.h:1763
AVRational framerate
Definition: avcodec.h:3451
const char * s
Definition: avisynth_c.h:768
int main(void)
Definition: options.c:176
static AVCodec dummy_v3_encoder
Definition: options.c:103
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
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
int avcodec_default_execute2(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2, int, int), void *arg, int *ret, int count)
AVOption.
Definition: opt.h:246
#define AV_OPT_FLAG_SUBTITLE_PARAM
Definition: opt.h:283
#define LIBAVUTIL_VERSION_INT
Definition: version.h:86
Memory handling functions.
void av_opt_set_defaults(void *s)
Set the values of all AVOption fields to their default values.
Definition: opt.c:1291
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:281
char * str
Definition: options.c:53
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:2165
static const AVOption avcodec_options[]
Definition: options_table.h:44
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1982
enum AVMediaType type
Definition: avcodec.h:3743
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:222
int(* decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt)
Definition: avcodec.h:3813
static void test_copy(const AVCodec *c1, const AVCodec *c2)
Definition: options.c:140
static AVPacket pkt
#define src
Definition: vp8dsp.c:254
AVCodec.
Definition: avcodec.h:3730
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1891
static void copy_context_reset(AVCodecContext *avctx)
Definition: options.c:191
const AVClass * avcodec_get_class(void)
Get the AVClass for AVCodecContext.
Definition: options.c:295
static const AVClass av_codec_context_class
Definition: options.c:80
struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:3074
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
static int init_context_defaults(AVCodecContext *s, const AVCodec *codec)
Definition: options.c:92
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
Definition: decode.c:1120
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2524
uint8_t
#define av_malloc(s)
static const AVOption subtitle_rect_options[]
Definition: options.c:329
AVOptions.
int subtitle_header_size
Definition: avcodec.h:3388
static AVCodec dummy_v1_encoder
Definition: options.c:79
AVClass * av_class
Definition: options.c:45
void * fake_av_class
Definition: options.c:51
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1869
const AVClass * av_class
information on struct for av_log
Definition: avcodec.h:1759
static AVFrame * frame
static const AVClass av_subtitle_rect_class
Definition: options.c:340
#define height
static int flags
Definition: log.c:57
static const uint64_t c1
Definition: murmur3.c:49
uint8_t * data
Definition: avcodec.h:1616
const AVClass * avcodec_get_frame_class(void)
Get the AVClass for AVFrame.
Definition: options.c:322
static int dummy_init(AVCodecContext *ctx)
Definition: options.c:24
#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:1163
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
Definition: avcodec.h:3465
enum AVCodecID id
Definition: avcodec.h:3744
const AVCodecDefault * defaults
Private codec-specific defaults.
Definition: avcodec.h:3791
#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:163
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:149
char * str
Definition: options.c:47
int avcodec_is_open(AVCodecContext *s)
Definition: utils.c:2137
static void * codec_child_next(void *obj, void *prev)
Definition: options.c:49
uint16_t width
Definition: gdv.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:3737
AVClassCategory category
Category used for visualization (like color) This is only set if the category is equal for all object...
Definition: log.h:130
#define fail()
Definition: checkasm.h:109
static void test_copy_print_codec(const AVCodecContext *ctx)
Definition: options.c:123
common internal API header
int rc_override_count
ratecontrol override, see RcOverride
Definition: avcodec.h:2738
AVPacketSideData * coded_side_data
Additional data associated with the entire coded stream.
Definition: avcodec.h:3582
static const AVClass dummy_v1_class
Definition: options.c:64
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
Copy the settings of the source AVCodecContext into the destination AVCodecContext.
Definition: options.c:216
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:157
#define OFFSET(x)
Definition: options.c:56
int width
picture width / height.
Definition: avcodec.h:1941
AVBufferRef * hw_frames_ctx
A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames...
Definition: avcodec.h:3607
static const AVOption dummy_options[]
Definition: options.c:58
int priv_data_size
Definition: avcodec.h:3766
AVFormatContext * ctx
Definition: movenc.c:48
static const AVClass * codec_child_class_next(const AVClass *prev)
Definition: options.c:57
static const AVClass dummy_v2_class
Definition: options.c:71
const AVClass * avcodec_get_subtitle_rect_class(void)
Get the AVClass for AVSubtitleRect.
Definition: options.c:347
void av_opt_set_defaults2(void *s, int mask, int flags)
Set the values of all AVOption fields to their default values.
Definition: opt.c:1296
int64_t reordered_opaque
opaque 64-bit number (generally a PTS) that will be reordered and output in AVFrame.reordered_opaque
Definition: avcodec.h:3067
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:200
static AVCodec dummy_v2_encoder
Definition: options.c:91
RcOverride * rc_override
Definition: avcodec.h:2739
#define FF_ARRAY_ELEMS(a)
int av_opt_get_int(void *obj, const char *name, int search_flags, int64_t *out_val)
Definition: opt.c:875
sample_rate
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags)
The default callback for AVCodecContext.get_buffer2().
Definition: decode.c:1442
#define SROFFSET(x)
Definition: options.c:327
Libavcodec external API header.
enum AVMediaType codec_type
Definition: avcodec.h:1762
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:172
enum AVCodecID codec_id
Definition: avcodec.h:1771
#define AV_OPT_FLAG_VIDEO_PARAM
Definition: opt.h:282
main external API structure.
Definition: avcodec.h:1754
GLint GLenum type
Definition: opengl_enc.c:105
int extradata_size
Definition: avcodec.h:1870
uint16_t * intra_matrix
custom intra quantization matrix
Definition: avcodec.h:2327
int nb_coded_side_data
Definition: avcodec.h:3583
static const char * format
Definition: movenc.c:47
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:2032
#define VE
Definition: options.c:57
Rational number (pair of numerator and denominator).
Definition: rational.h:58
static int dummy_close(AVCodecContext *ctx)
Definition: options.c:32
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:2671
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: utils.c:627
uint16_t * inter_matrix
custom inter quantization matrix
Definition: avcodec.h:2334
const AVClass * priv_class
AVClass for the private context.
Definition: avcodec.h:3756
const uint8_t * key
Definition: internal.h:226
const uint8_t * value
Definition: internal.h:227
void av_opt_free(void *obj)
Free all allocated objects in obj.
Definition: opt.c:1544
static const AVOption frame_options[]
Definition: options.c:302
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:83
common internal api header.
static double c[64]
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:93
int av_opt_copy(void *dst, const void *src)
Copy options from src object into dest object.
Definition: opt.c:1702
static AVClassCategory get_category(void *ptr)
Definition: options.c:73
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:3174
static const uint64_t c2
Definition: murmur3.c:50
static const AVClass av_frame_class
Definition: options.c:315
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
Definition: options.c:151
static AVCodec dummy_v4_encoder
Definition: options.c:114
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:777
void * priv_data
Definition: avcodec.h:1796
int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
Definition: opt.c:751
#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:3223
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
#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:3243
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1804
FF_DISABLE_DEPRECATION_WARNINGS static FF_ENABLE_DEPRECATION_WARNINGS const char * context_to_name(void *ptr)
Definition: options.c:40
void avcodec_register(AVCodec *codec)
Register the codec codec and initialize libavcodec.
Definition: utils.c:179
int * slice_offset
slice offsets in the frame in bytes
Definition: avcodec.h:2156
#define av_freep(p)
AVBufferRef * hw_device_ctx
A reference to the AVHWDeviceContext describing the device which will be used by a hardware encoder/d...
Definition: avcodec.h:3659
This structure stores compressed data.
Definition: avcodec.h:1649
int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
Definition: opt.c:449
enum AVPixelFormat sw_pix_fmt
Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:3458
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
#define FOFFSET(x)
Definition: options.c:300
int avcodec_default_execute(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
Definition: utils.c:535
uint8_t * subtitle_header
Header containing style information for text subtitles.
Definition: avcodec.h:3387
static int dummy_encode(AVCodecContext *ctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
Definition: options.c:39