FFmpeg
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 <string.h>
34 
36 #include "options_table.h"
38 
39 static const char* context_to_name(void* ptr) {
40  AVCodecContext *avc= ptr;
41 
42  if(avc && avc->codec && avc->codec->name)
43  return avc->codec->name;
44  else
45  return "NULL";
46 }
47 
48 static void *codec_child_next(void *obj, void *prev)
49 {
50  AVCodecContext *s = obj;
51  if (!prev && s->codec && s->codec->priv_class && s->priv_data)
52  return s->priv_data;
53  return NULL;
54 }
55 
56 #if FF_API_CHILD_CLASS_NEXT
57 static const AVClass *codec_child_class_next(const AVClass *prev)
58 {
59  void *iter = NULL;
60  const AVCodec *c = NULL;
61 
62  /* find the codec that corresponds to prev */
63  while (prev && (c = av_codec_iterate(&iter)))
64  if (c->priv_class == prev)
65  break;
66 
67  /* find next codec with priv options */
68  while (c = av_codec_iterate(&iter))
69  if (c->priv_class)
70  return c->priv_class;
71  return NULL;
72 }
73 #endif
74 
75 static const AVClass *codec_child_class_iterate(void **iter)
76 {
77  const AVCodec *c;
78  /* find next codec with priv options */
79  while (c = av_codec_iterate(iter))
80  if (c->priv_class)
81  return c->priv_class;
82  return NULL;
83 }
84 
85 static AVClassCategory get_category(void *ptr)
86 {
87  AVCodecContext* avctx = ptr;
88  if(avctx->codec && avctx->codec->decode) return AV_CLASS_CATEGORY_DECODER;
89  else return AV_CLASS_CATEGORY_ENCODER;
90 }
91 
93  .class_name = "AVCodecContext",
94  .item_name = context_to_name,
95  .option = avcodec_options,
96  .version = LIBAVUTIL_VERSION_INT,
97  .log_level_offset_offset = offsetof(AVCodecContext, log_level_offset),
98  .child_next = codec_child_next,
99 #if FF_API_CHILD_CLASS_NEXT
100  .child_class_next = codec_child_class_next,
101 #endif
102  .child_class_iterate = codec_child_class_iterate,
104  .get_category = get_category,
105 };
106 
107 static int init_context_defaults(AVCodecContext *s, const AVCodec *codec)
108 {
109  int flags=0;
110  memset(s, 0, sizeof(AVCodecContext));
111 
113 
114  s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN;
115  if (codec) {
116  s->codec = codec;
117  s->codec_id = codec->id;
118  }
119 
122  else if(s->codec_type == AVMEDIA_TYPE_VIDEO)
124  else if(s->codec_type == AVMEDIA_TYPE_SUBTITLE)
126  av_opt_set_defaults2(s, flags, flags);
127 
128  s->time_base = (AVRational){0,1};
129  s->framerate = (AVRational){ 0, 1 };
130  s->pkt_timebase = (AVRational){ 0, 1 };
135  s->sample_aspect_ratio = (AVRational){0,1};
139 
141  if(codec && codec->priv_data_size){
142  if(!s->priv_data){
143  s->priv_data= av_mallocz(codec->priv_data_size);
144  if (!s->priv_data) {
145  return AVERROR(ENOMEM);
146  }
147  }
148  if(codec->priv_class){
149  *(const AVClass**)s->priv_data = codec->priv_class;
151  }
152  }
153  if (codec && codec->defaults) {
154  int ret;
155  const AVCodecDefault *d = codec->defaults;
156  while (d->key) {
157  ret = av_opt_set(s, d->key, d->value, 0);
158  av_assert0(ret >= 0);
159  d++;
160  }
161  }
162  return 0;
163 }
164 
165 #if FF_API_GET_CONTEXT_DEFAULTS
167 {
168  return init_context_defaults(s, codec);
169 }
170 #endif
171 
173 {
174  AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
175 
176  if (!avctx)
177  return NULL;
178 
179  if (init_context_defaults(avctx, codec) < 0) {
180  av_free(avctx);
181  return NULL;
182  }
183 
184  return avctx;
185 }
186 
188 {
189  AVCodecContext *avctx = *pavctx;
190 
191  if (!avctx)
192  return;
193 
194  avcodec_close(avctx);
195 
196  av_freep(&avctx->extradata);
197  av_freep(&avctx->subtitle_header);
198  av_freep(&avctx->intra_matrix);
199  av_freep(&avctx->inter_matrix);
200  av_freep(&avctx->rc_override);
201 
202  av_freep(pavctx);
203 }
204 
205 #if FF_API_COPY_CONTEXT
207 {
208  int i;
209 
210  av_opt_free(avctx);
211 #if FF_API_CODED_FRAME
213  av_frame_free(&avctx->coded_frame);
215 #endif
216  av_freep(&avctx->rc_override);
217  av_freep(&avctx->intra_matrix);
218  av_freep(&avctx->inter_matrix);
219  av_freep(&avctx->extradata);
220  av_freep(&avctx->subtitle_header);
223  for (i = 0; i < avctx->nb_coded_side_data; i++)
224  av_freep(&avctx->coded_side_data[i].data);
225  av_freep(&avctx->coded_side_data);
226  avctx->subtitle_header_size = 0;
227  avctx->nb_coded_side_data = 0;
228  avctx->extradata_size = 0;
229 }
230 
232 {
233  const AVCodec *orig_codec = dest->codec;
234  uint8_t *orig_priv_data = dest->priv_data;
235 
236  if (avcodec_is_open(dest)) { // check that the dest context is uninitialized
237  av_log(dest, AV_LOG_ERROR,
238  "Tried to copy AVCodecContext %p into already-initialized %p\n",
239  src, dest);
240  return AVERROR(EINVAL);
241  }
242 
243  copy_context_reset(dest);
244 
245  memcpy(dest, src, sizeof(*dest));
246  av_opt_copy(dest, src);
247 
248  dest->priv_data = orig_priv_data;
249  dest->codec = orig_codec;
250 
251  if (orig_priv_data && src->codec && src->codec->priv_class &&
252  dest->codec && dest->codec->priv_class)
253  av_opt_copy(orig_priv_data, src->priv_data);
254 
255 
256  /* set values specific to opened codecs back to their default state */
257  dest->slice_offset = NULL;
258  dest->hwaccel = NULL;
259  dest->internal = NULL;
260 #if FF_API_CODED_FRAME
262  dest->coded_frame = NULL;
264 #endif
265 
266  /* reallocate values that should be allocated separately */
267  dest->extradata = NULL;
268  dest->coded_side_data = NULL;
269  dest->intra_matrix = NULL;
270  dest->inter_matrix = NULL;
271  dest->rc_override = NULL;
272  dest->subtitle_header = NULL;
273  dest->hw_frames_ctx = NULL;
274  dest->hw_device_ctx = NULL;
275  dest->nb_coded_side_data = 0;
276 
277 #define alloc_and_copy_or_fail(obj, size, pad) \
278  if (src->obj && size > 0) { \
279  dest->obj = av_malloc(size + pad); \
280  if (!dest->obj) \
281  goto fail; \
282  memcpy(dest->obj, src->obj, size); \
283  if (pad) \
284  memset(((uint8_t *) dest->obj) + size, 0, pad); \
285  }
286  alloc_and_copy_or_fail(extradata, src->extradata_size,
288  dest->extradata_size = src->extradata_size;
289  alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0);
290  alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0);
291  alloc_and_copy_or_fail(rc_override, src->rc_override_count * sizeof(*src->rc_override), 0);
292  alloc_and_copy_or_fail(subtitle_header, src->subtitle_header_size, 1);
294 #undef alloc_and_copy_or_fail
295 
296  if (src->hw_frames_ctx) {
298  if (!dest->hw_frames_ctx)
299  goto fail;
300  }
301 
302  return 0;
303 
304 fail:
305  copy_context_reset(dest);
306  return AVERROR(ENOMEM);
307 }
308 #endif
309 
311 {
312  return &av_codec_context_class;
313 }
314 
315 #define FOFFSET(x) offsetof(AVFrame,x)
316 
317 static const AVOption frame_options[]={
318 {"best_effort_timestamp", "", FOFFSET(best_effort_timestamp), AV_OPT_TYPE_INT64, {.i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, 0},
319 {"pkt_pos", "", FOFFSET(pkt_pos), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
320 {"pkt_size", "", FOFFSET(pkt_size), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
321 {"sample_aspect_ratio", "", FOFFSET(sample_aspect_ratio), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, 0, INT_MAX, 0},
322 {"width", "", FOFFSET(width), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
323 {"height", "", FOFFSET(height), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
324 {"format", "", FOFFSET(format), AV_OPT_TYPE_INT, {.i64 = -1 }, 0, INT_MAX, 0},
325 {"channel_layout", "", FOFFSET(channel_layout), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, 0},
326 {"sample_rate", "", FOFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
327 {NULL},
328 };
329 
330 #if FF_API_COPY_CONTEXT
331 static const AVClass av_frame_class = {
332  .class_name = "AVFrame",
333  .item_name = NULL,
334  .option = frame_options,
335  .version = LIBAVUTIL_VERSION_INT,
336 };
337 
339 {
340  return &av_frame_class;
341 }
342 #endif
343 
344 #define SROFFSET(x) offsetof(AVSubtitleRect,x)
345 
347 {"x", "", SROFFSET(x), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
348 {"y", "", SROFFSET(y), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
349 {"w", "", SROFFSET(w), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
350 {"h", "", SROFFSET(h), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
351 {"type", "", SROFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
352 {"flags", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0, "flags"},
353 {"forced", "", SROFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, 1, 0},
354 {NULL},
355 };
356 
357 #if FF_API_COPY_CONTEXT
359  .class_name = "AVSubtitleRect",
360  .item_name = NULL,
361  .option = subtitle_rect_options,
362  .version = LIBAVUTIL_VERSION_INT,
363 };
364 
366 {
367  return &av_subtitle_rect_class;
368 }
369 #endif
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
callback to negotiate the pixelFormat
Definition: avcodec.h:778
#define NULL
Definition: coverity.c:32
const struct AVCodec * codec
Definition: avcodec.h:535
AVRational framerate
Definition: avcodec.h:2069
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
int avcodec_default_execute2(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2, int, int), void *arg, int *ret, int count)
AVOption.
Definition: opt.h:248
#define AV_OPT_FLAG_SUBTITLE_PARAM
Definition: opt.h:282
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
Memory handling functions.
void av_opt_set_defaults(void *s)
Set the values of all AVOption fields to their default values.
Definition: opt.c:1357
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:280
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:905
static const AVOption avcodec_options[]
Definition: options_table.h:45
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
GLint GLenum type
Definition: opengl_enc.c:104
enum AVMediaType type
Definition: codec.h:203
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1690
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 format(the sample packing is implied by the sample format) and sample rate.The lists are not just lists
const AVCodec * av_codec_iterate(void **opaque)
Iterate over all registered codecs.
Definition: allcodecs.c:849
AVCodec.
Definition: codec.h:190
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:649
static void copy_context_reset(AVCodecContext *avctx)
Definition: options.c:206
const AVClass * avcodec_get_class(void)
Get the AVClass for AVCodecContext.
Definition: options.c:310
static const AVClass av_codec_context_class
Definition: options.c:92
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:107
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
Definition: decode.c:1087
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1194
uint8_t
#define av_malloc(s)
static const AVOption subtitle_rect_options[]
Definition: options.c:346
AVOptions.
int subtitle_header_size
Definition: avcodec.h:2015
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:627
const AVClass * av_class
information on struct for av_log
Definition: avcodec.h:531
static const AVClass av_subtitle_rect_class
Definition: options.c:358
#define height
uint8_t * data
Definition: packet.h:307
const AVClass * avcodec_get_frame_class(void)
Get the AVClass for AVFrame.
Definition: options.c:338
#define av_log(a,...)
#define src
Definition: vp8dsp.c:254
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:1133
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
Definition: avcodec.h:2083
enum AVCodecID id
Definition: codec.h:204
const AVCodecDefault * defaults
Private codec-specific defaults.
Definition: codec.h:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
int avcodec_is_open(AVCodecContext *s)
Definition: utils.c:1944
static void * codec_child_next(void *obj, void *prev)
Definition: options.c:48
simple assert() macros that are a bit more flexible than ISO C assert().
const char * name
Name of the codec implementation.
Definition: codec.h:197
AVClassCategory category
Category used for visualization (like color) This is only set if the category is equal for all object...
Definition: log.h:133
#define fail()
Definition: checkasm.h:123
common internal API header
int rc_override_count
ratecontrol override, see RcOverride
Definition: avcodec.h:1396
AVPacketSideData * coded_side_data
Additional data associated with the entire coded stream.
Definition: avcodec.h:2201
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
Copy the settings of the source AVCodecContext into the destination AVCodecContext.
Definition: options.c:231
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:172
static const AVClass * codec_child_class_iterate(void **iter)
Definition: options.c:75
#define width
uint8_t w
Definition: llviddspenc.c:38
AVBufferRef * hw_frames_ctx
A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames...
Definition: avcodec.h:2226
int priv_data_size
Definition: codec.h:238
const AVClass * avcodec_get_subtitle_rect_class(void)
Get the AVClass for AVSubtitleRect.
Definition: options.c:365
#define s(width, name)
Definition: cbs_vp9.c:257
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:1362
int64_t reordered_opaque
opaque 64-bit number (generally a PTS) that will be reordered and output in AVFrame.reordered_opaque
Definition: avcodec.h:1683
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:200
RcOverride * rc_override
Definition: avcodec.h:1397
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:1845
int(* decode)(struct AVCodecContext *, void *outdata, int *outdata_size, struct AVPacket *avpkt)
Definition: codec.h:284
sample_rate
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags)
The default callback for AVCodecContext.get_buffer2().
Definition: decode.c:1668
#define SROFFSET(x)
Definition: options.c:344
Libavcodec external API header.
enum AVMediaType codec_type
Definition: avcodec.h:534
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:187
enum AVCodecID codec_id
Definition: avcodec.h:536
#define AV_OPT_FLAG_VIDEO_PARAM
Definition: opt.h:281
main external API structure.
Definition: avcodec.h:526
int extradata_size
Definition: avcodec.h:628
uint16_t * intra_matrix
custom intra quantization matrix Must be allocated with the av_malloc() family of functions...
Definition: avcodec.h:1026
int nb_coded_side_data
Definition: avcodec.h:2202
Describe the class of an AVClass context structure.
Definition: log.h:67
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:1341
Rational number (pair of numerator and denominator).
Definition: rational.h:58
uint16_t * inter_matrix
custom inter quantization matrix Must be allocated with the av_malloc() family of functions...
Definition: avcodec.h:1035
#define flags(name, subs,...)
Definition: cbs_av1.c:560
const AVClass * priv_class
AVClass for the private context.
Definition: codec.h:216
const uint8_t * key
Definition: internal.h:209
const uint8_t * value
Definition: internal.h:210
void av_opt_free(void *obj)
Free all allocated objects in obj.
Definition: opt.c:1610
static const AVOption frame_options[]
Definition: options.c:317
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
common internal api header.
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:1788
static AVClassCategory get_category(void *ptr)
Definition: options.c:85
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:1776
static const AVClass av_frame_class
Definition: options.c:331
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
Definition: options.c:166
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:215
void * priv_data
Definition: avcodec.h:553
#define av_free(p)
AVClassCategory
Definition: log.h:29
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:85
#define alloc_and_copy_or_fail(obj, size, pad)
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:561
FF_DISABLE_DEPRECATION_WARNINGS static FF_ENABLE_DEPRECATION_WARNINGS const char * context_to_name(void *ptr)
Definition: options.c:39
int * slice_offset
slice offsets in the frame in bytes
Definition: avcodec.h:896
#define av_freep(p)
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
AVBufferRef * hw_device_ctx
A reference to the AVHWDeviceContext describing the device which will be used by a hardware encoder/d...
Definition: avcodec.h:2278
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:1825
int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
Definition: opt.c:465
enum AVPixelFormat sw_pix_fmt
Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:2076
int i
Definition: input.c:407
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
#define FOFFSET(x)
Definition: options.c:315
int avcodec_default_execute(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
Definition: utils.c:443
uint8_t * subtitle_header
Header containing style information for text subtitles.
Definition: avcodec.h:2014