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avio.h
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1 /*
2  * copyright (c) 2001 Fabrice Bellard
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 #ifndef AVFORMAT_AVIO_H
21 #define AVFORMAT_AVIO_H
22 
23 /**
24  * @file
25  * @ingroup lavf_io
26  * Buffered I/O operations
27  */
28 
29 #include <stdint.h>
30 
31 #include "libavutil/common.h"
32 #include "libavutil/dict.h"
33 #include "libavutil/log.h"
34 
35 #include "libavformat/version.h"
36 
37 #define AVIO_SEEKABLE_NORMAL 0x0001 /**< Seeking works like for a local file */
38 
39 /**
40  * Callback for checking whether to abort blocking functions.
41  * AVERROR_EXIT is returned in this case by the interrupted
42  * function. During blocking operations, callback is called with
43  * opaque as parameter. If the callback returns 1, the
44  * blocking operation will be aborted.
45  *
46  * No members can be added to this struct without a major bump, if
47  * new elements have been added after this struct in AVFormatContext
48  * or AVIOContext.
49  */
50 typedef struct AVIOInterruptCB {
51  int (*callback)(void*);
52  void *opaque;
54 
55 /**
56  * Directory entry types.
57  */
70 };
71 
72 /**
73  * Describes single entry of the directory.
74  *
75  * Only name and type fields are guaranteed be set.
76  * Rest of fields are protocol or/and platform dependent and might be unknown.
77  */
78 typedef struct AVIODirEntry {
79  char *name; /**< Filename */
80  int type; /**< Type of the entry */
81  int utf8; /**< Set to 1 when name is encoded with UTF-8, 0 otherwise.
82  Name can be encoded with UTF-8 eventhough 0 is set. */
83  int64_t size; /**< File size in bytes, -1 if unknown. */
84  int64_t modification_timestamp; /**< Time of last modification in microseconds since unix
85  epoch, -1 if unknown. */
86  int64_t access_timestamp; /**< Time of last access in microseconds since unix epoch,
87  -1 if unknown. */
88  int64_t status_change_timestamp; /**< Time of last status change in microseconds since unix
89  epoch, -1 if unknown. */
90  int64_t user_id; /**< User ID of owner, -1 if unknown. */
91  int64_t group_id; /**< Group ID of owner, -1 if unknown. */
92  int64_t filemode; /**< Unix file mode, -1 if unknown. */
93 } AVIODirEntry;
94 
95 typedef struct AVIODirContext {
98 
99 /**
100  * Bytestream IO Context.
101  * New fields can be added to the end with minor version bumps.
102  * Removal, reordering and changes to existing fields require a major
103  * version bump.
104  * sizeof(AVIOContext) must not be used outside libav*.
105  *
106  * @note None of the function pointers in AVIOContext should be called
107  * directly, they should only be set by the client application
108  * when implementing custom I/O. Normally these are set to the
109  * function pointers specified in avio_alloc_context()
110  */
111 typedef struct AVIOContext {
112  /**
113  * A class for private options.
114  *
115  * If this AVIOContext is created by avio_open2(), av_class is set and
116  * passes the options down to protocols.
117  *
118  * If this AVIOContext is manually allocated, then av_class may be set by
119  * the caller.
120  *
121  * warning -- this field can be NULL, be sure to not pass this AVIOContext
122  * to any av_opt_* functions in that case.
123  */
125  unsigned char *buffer; /**< Start of the buffer. */
126  int buffer_size; /**< Maximum buffer size */
127  unsigned char *buf_ptr; /**< Current position in the buffer */
128  unsigned char *buf_end; /**< End of the data, may be less than
129  buffer+buffer_size if the read function returned
130  less data than requested, e.g. for streams where
131  no more data has been received yet. */
132  void *opaque; /**< A private pointer, passed to the read/write/seek/...
133  functions. */
134  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size);
135  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size);
136  int64_t (*seek)(void *opaque, int64_t offset, int whence);
137  int64_t pos; /**< position in the file of the current buffer */
138  int must_flush; /**< true if the next seek should flush */
139  int eof_reached; /**< true if eof reached */
140  int write_flag; /**< true if open for writing */
142  unsigned long checksum;
143  unsigned char *checksum_ptr;
144  unsigned long (*update_checksum)(unsigned long checksum, const uint8_t *buf, unsigned int size);
145  int error; /**< contains the error code or 0 if no error happened */
146  /**
147  * Pause or resume playback for network streaming protocols - e.g. MMS.
148  */
149  int (*read_pause)(void *opaque, int pause);
150  /**
151  * Seek to a given timestamp in stream with the specified stream_index.
152  * Needed for some network streaming protocols which don't support seeking
153  * to byte position.
154  */
155  int64_t (*read_seek)(void *opaque, int stream_index,
156  int64_t timestamp, int flags);
157  /**
158  * A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
159  */
160  int seekable;
161 
162  /**
163  * max filesize, used to limit allocations
164  * This field is internal to libavformat and access from outside is not allowed.
165  */
166  int64_t maxsize;
167 
168  /**
169  * avio_read and avio_write should if possible be satisfied directly
170  * instead of going through a buffer, and avio_seek will always
171  * call the underlying seek function directly.
172  */
173  int direct;
174 
175  /**
176  * Bytes read statistic
177  * This field is internal to libavformat and access from outside is not allowed.
178  */
179  int64_t bytes_read;
180 
181  /**
182  * seek statistic
183  * This field is internal to libavformat and access from outside is not allowed.
184  */
186 
187  /**
188  * writeout statistic
189  * This field is internal to libavformat and access from outside is not allowed.
190  */
192 
193  /**
194  * Original buffer size
195  * used internally after probing and ensure seekback to reset the buffer size
196  * This field is internal to libavformat and access from outside is not allowed.
197  */
199 } AVIOContext;
200 
201 /* unbuffered I/O */
202 
203 /**
204  * Return the name of the protocol that will handle the passed URL.
205  *
206  * NULL is returned if no protocol could be found for the given URL.
207  *
208  * @return Name of the protocol or NULL.
209  */
210 const char *avio_find_protocol_name(const char *url);
211 
212 /**
213  * Return AVIO_FLAG_* access flags corresponding to the access permissions
214  * of the resource in url, or a negative value corresponding to an
215  * AVERROR code in case of failure. The returned access flags are
216  * masked by the value in flags.
217  *
218  * @note This function is intrinsically unsafe, in the sense that the
219  * checked resource may change its existence or permission status from
220  * one call to another. Thus you should not trust the returned value,
221  * unless you are sure that no other processes are accessing the
222  * checked resource.
223  */
224 int avio_check(const char *url, int flags);
225 
226 /**
227  * Open directory for reading.
228  *
229  * @param s directory read context. Pointer to a NULL pointer must be passed.
230  * @param url directory to be listed.
231  * @param options A dictionary filled with protocol-private options. On return
232  * this parameter will be destroyed and replaced with a dictionary
233  * containing options that were not found. May be NULL.
234  * @return >=0 on success or negative on error.
235  */
236 int avio_open_dir(AVIODirContext **s, const char *url, AVDictionary **options);
237 
238 /**
239  * Get next directory entry.
240  *
241  * Returned entry must be freed with avio_free_directory_entry(). In particular
242  * it may outlive AVIODirContext.
243  *
244  * @param s directory read context.
245  * @param[out] next next entry or NULL when no more entries.
246  * @return >=0 on success or negative on error. End of list is not considered an
247  * error.
248  */
250 
251 /**
252  * Close directory.
253  *
254  * @note Entries created using avio_read_dir() are not deleted and must be
255  * freeded with avio_free_directory_entry().
256  *
257  * @param s directory read context.
258  * @return >=0 on success or negative on error.
259  */
261 
262 /**
263  * Free entry allocated by avio_read_dir().
264  *
265  * @param entry entry to be freed.
266  */
268 
269 /**
270  * Allocate and initialize an AVIOContext for buffered I/O. It must be later
271  * freed with av_free().
272  *
273  * @param buffer Memory block for input/output operations via AVIOContext.
274  * The buffer must be allocated with av_malloc() and friends.
275  * It may be freed and replaced with a new buffer by libavformat.
276  * AVIOContext.buffer holds the buffer currently in use,
277  * which must be later freed with av_free().
278  * @param buffer_size The buffer size is very important for performance.
279  * For protocols with fixed blocksize it should be set to this blocksize.
280  * For others a typical size is a cache page, e.g. 4kb.
281  * @param write_flag Set to 1 if the buffer should be writable, 0 otherwise.
282  * @param opaque An opaque pointer to user-specific data.
283  * @param read_packet A function for refilling the buffer, may be NULL.
284  * @param write_packet A function for writing the buffer contents, may be NULL.
285  * The function may not change the input buffers content.
286  * @param seek A function for seeking to specified byte position, may be NULL.
287  *
288  * @return Allocated AVIOContext or NULL on failure.
289  */
291  unsigned char *buffer,
292  int buffer_size,
293  int write_flag,
294  void *opaque,
295  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
296  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
297  int64_t (*seek)(void *opaque, int64_t offset, int whence));
298 
299 void avio_w8(AVIOContext *s, int b);
300 void avio_write(AVIOContext *s, const unsigned char *buf, int size);
301 void avio_wl64(AVIOContext *s, uint64_t val);
302 void avio_wb64(AVIOContext *s, uint64_t val);
303 void avio_wl32(AVIOContext *s, unsigned int val);
304 void avio_wb32(AVIOContext *s, unsigned int val);
305 void avio_wl24(AVIOContext *s, unsigned int val);
306 void avio_wb24(AVIOContext *s, unsigned int val);
307 void avio_wl16(AVIOContext *s, unsigned int val);
308 void avio_wb16(AVIOContext *s, unsigned int val);
309 
310 /**
311  * Write a NULL-terminated string.
312  * @return number of bytes written.
313  */
314 int avio_put_str(AVIOContext *s, const char *str);
315 
316 /**
317  * Convert an UTF-8 string to UTF-16LE and write it.
318  * @param s the AVIOContext
319  * @param str NULL-terminated UTF-8 string
320  *
321  * @return number of bytes written.
322  */
323 int avio_put_str16le(AVIOContext *s, const char *str);
324 
325 /**
326  * Convert an UTF-8 string to UTF-16BE and write it.
327  * @param s the AVIOContext
328  * @param str NULL-terminated UTF-8 string
329  *
330  * @return number of bytes written.
331  */
332 int avio_put_str16be(AVIOContext *s, const char *str);
333 
334 /**
335  * Passing this as the "whence" parameter to a seek function causes it to
336  * return the filesize without seeking anywhere. Supporting this is optional.
337  * If it is not supported then the seek function will return <0.
338  */
339 #define AVSEEK_SIZE 0x10000
340 
341 /**
342  * Oring this flag as into the "whence" parameter to a seek function causes it to
343  * seek by any means (like reopening and linear reading) or other normally unreasonable
344  * means that can be extremely slow.
345  * This may be ignored by the seek code.
346  */
347 #define AVSEEK_FORCE 0x20000
348 
349 /**
350  * fseek() equivalent for AVIOContext.
351  * @return new position or AVERROR.
352  */
353 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence);
354 
355 /**
356  * Skip given number of bytes forward
357  * @return new position or AVERROR.
358  */
359 int64_t avio_skip(AVIOContext *s, int64_t offset);
360 
361 /**
362  * ftell() equivalent for AVIOContext.
363  * @return position or AVERROR.
364  */
366 {
367  return avio_seek(s, 0, SEEK_CUR);
368 }
369 
370 /**
371  * Get the filesize.
372  * @return filesize or AVERROR
373  */
374 int64_t avio_size(AVIOContext *s);
375 
376 /**
377  * feof() equivalent for AVIOContext.
378  * @return non zero if and only if end of file
379  */
380 int avio_feof(AVIOContext *s);
381 #if FF_API_URL_FEOF
382 /**
383  * @deprecated use avio_feof()
384  */
386 int url_feof(AVIOContext *s);
387 #endif
388 
389 /** @warning currently size is limited */
390 int avio_printf(AVIOContext *s, const char *fmt, ...) av_printf_format(2, 3);
391 
392 /**
393  * Force flushing of buffered data.
394  *
395  * For write streams, force the buffered data to be immediately written to the output,
396  * without to wait to fill the internal buffer.
397  *
398  * For read streams, discard all currently buffered data, and advance the
399  * reported file position to that of the underlying stream. This does not
400  * read new data, and does not perform any seeks.
401  */
402 void avio_flush(AVIOContext *s);
403 
404 /**
405  * Read size bytes from AVIOContext into buf.
406  * @return number of bytes read or AVERROR
407  */
408 int avio_read(AVIOContext *s, unsigned char *buf, int size);
409 
410 /**
411  * @name Functions for reading from AVIOContext
412  * @{
413  *
414  * @note return 0 if EOF, so you cannot use it if EOF handling is
415  * necessary
416  */
417 int avio_r8 (AVIOContext *s);
418 unsigned int avio_rl16(AVIOContext *s);
419 unsigned int avio_rl24(AVIOContext *s);
420 unsigned int avio_rl32(AVIOContext *s);
421 uint64_t avio_rl64(AVIOContext *s);
422 unsigned int avio_rb16(AVIOContext *s);
423 unsigned int avio_rb24(AVIOContext *s);
424 unsigned int avio_rb32(AVIOContext *s);
425 uint64_t avio_rb64(AVIOContext *s);
426 /**
427  * @}
428  */
429 
430 /**
431  * Read a string from pb into buf. The reading will terminate when either
432  * a NULL character was encountered, maxlen bytes have been read, or nothing
433  * more can be read from pb. The result is guaranteed to be NULL-terminated, it
434  * will be truncated if buf is too small.
435  * Note that the string is not interpreted or validated in any way, it
436  * might get truncated in the middle of a sequence for multi-byte encodings.
437  *
438  * @return number of bytes read (is always <= maxlen).
439  * If reading ends on EOF or error, the return value will be one more than
440  * bytes actually read.
441  */
442 int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen);
443 
444 /**
445  * Read a UTF-16 string from pb and convert it to UTF-8.
446  * The reading will terminate when either a null or invalid character was
447  * encountered or maxlen bytes have been read.
448  * @return number of bytes read (is always <= maxlen)
449  */
450 int avio_get_str16le(AVIOContext *pb, int maxlen, char *buf, int buflen);
451 int avio_get_str16be(AVIOContext *pb, int maxlen, char *buf, int buflen);
452 
453 
454 /**
455  * @name URL open modes
456  * The flags argument to avio_open must be one of the following
457  * constants, optionally ORed with other flags.
458  * @{
459  */
460 #define AVIO_FLAG_READ 1 /**< read-only */
461 #define AVIO_FLAG_WRITE 2 /**< write-only */
462 #define AVIO_FLAG_READ_WRITE (AVIO_FLAG_READ|AVIO_FLAG_WRITE) /**< read-write pseudo flag */
463 /**
464  * @}
465  */
466 
467 /**
468  * Use non-blocking mode.
469  * If this flag is set, operations on the context will return
470  * AVERROR(EAGAIN) if they can not be performed immediately.
471  * If this flag is not set, operations on the context will never return
472  * AVERROR(EAGAIN).
473  * Note that this flag does not affect the opening/connecting of the
474  * context. Connecting a protocol will always block if necessary (e.g. on
475  * network protocols) but never hang (e.g. on busy devices).
476  * Warning: non-blocking protocols is work-in-progress; this flag may be
477  * silently ignored.
478  */
479 #define AVIO_FLAG_NONBLOCK 8
480 
481 /**
482  * Use direct mode.
483  * avio_read and avio_write should if possible be satisfied directly
484  * instead of going through a buffer, and avio_seek will always
485  * call the underlying seek function directly.
486  */
487 #define AVIO_FLAG_DIRECT 0x8000
488 
489 /**
490  * Create and initialize a AVIOContext for accessing the
491  * resource indicated by url.
492  * @note When the resource indicated by url has been opened in
493  * read+write mode, the AVIOContext can be used only for writing.
494  *
495  * @param s Used to return the pointer to the created AVIOContext.
496  * In case of failure the pointed to value is set to NULL.
497  * @param url resource to access
498  * @param flags flags which control how the resource indicated by url
499  * is to be opened
500  * @return >= 0 in case of success, a negative value corresponding to an
501  * AVERROR code in case of failure
502  */
503 int avio_open(AVIOContext **s, const char *url, int flags);
504 
505 /**
506  * Create and initialize a AVIOContext for accessing the
507  * resource indicated by url.
508  * @note When the resource indicated by url has been opened in
509  * read+write mode, the AVIOContext can be used only for writing.
510  *
511  * @param s Used to return the pointer to the created AVIOContext.
512  * In case of failure the pointed to value is set to NULL.
513  * @param url resource to access
514  * @param flags flags which control how the resource indicated by url
515  * is to be opened
516  * @param int_cb an interrupt callback to be used at the protocols level
517  * @param options A dictionary filled with protocol-private options. On return
518  * this parameter will be destroyed and replaced with a dict containing options
519  * that were not found. May be NULL.
520  * @return >= 0 in case of success, a negative value corresponding to an
521  * AVERROR code in case of failure
522  */
523 int avio_open2(AVIOContext **s, const char *url, int flags,
525 
526 /**
527  * Close the resource accessed by the AVIOContext s and free it.
528  * This function can only be used if s was opened by avio_open().
529  *
530  * The internal buffer is automatically flushed before closing the
531  * resource.
532  *
533  * @return 0 on success, an AVERROR < 0 on error.
534  * @see avio_closep
535  */
536 int avio_close(AVIOContext *s);
537 
538 /**
539  * Close the resource accessed by the AVIOContext *s, free it
540  * and set the pointer pointing to it to NULL.
541  * This function can only be used if s was opened by avio_open().
542  *
543  * The internal buffer is automatically flushed before closing the
544  * resource.
545  *
546  * @return 0 on success, an AVERROR < 0 on error.
547  * @see avio_close
548  */
549 int avio_closep(AVIOContext **s);
550 
551 
552 /**
553  * Open a write only memory stream.
554  *
555  * @param s new IO context
556  * @return zero if no error.
557  */
559 
560 /**
561  * Return the written size and a pointer to the buffer. The buffer
562  * must be freed with av_free().
563  * Padding of FF_INPUT_BUFFER_PADDING_SIZE is added to the buffer.
564  *
565  * @param s IO context
566  * @param pbuffer pointer to a byte buffer
567  * @return the length of the byte buffer
568  */
569 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer);
570 
571 /**
572  * Iterate through names of available protocols.
573  *
574  * @param opaque A private pointer representing current protocol.
575  * It must be a pointer to NULL on first iteration and will
576  * be updated by successive calls to avio_enum_protocols.
577  * @param output If set to 1, iterate over output protocols,
578  * otherwise over input protocols.
579  *
580  * @return A static string containing the name of current protocol or NULL
581  */
582 const char *avio_enum_protocols(void **opaque, int output);
583 
584 /**
585  * Pause and resume playing - only meaningful if using a network streaming
586  * protocol (e.g. MMS).
587  *
588  * @param h IO context from which to call the read_pause function pointer
589  * @param pause 1 for pause, 0 for resume
590  */
591 int avio_pause(AVIOContext *h, int pause);
592 
593 /**
594  * Seek to a given timestamp relative to some component stream.
595  * Only meaningful if using a network streaming protocol (e.g. MMS.).
596  *
597  * @param h IO context from which to call the seek function pointers
598  * @param stream_index The stream index that the timestamp is relative to.
599  * If stream_index is (-1) the timestamp should be in AV_TIME_BASE
600  * units from the beginning of the presentation.
601  * If a stream_index >= 0 is used and the protocol does not support
602  * seeking based on component streams, the call will fail.
603  * @param timestamp timestamp in AVStream.time_base units
604  * or if there is no stream specified then in AV_TIME_BASE units.
605  * @param flags Optional combination of AVSEEK_FLAG_BACKWARD, AVSEEK_FLAG_BYTE
606  * and AVSEEK_FLAG_ANY. The protocol may silently ignore
607  * AVSEEK_FLAG_BACKWARD and AVSEEK_FLAG_ANY, but AVSEEK_FLAG_BYTE will
608  * fail if used and not supported.
609  * @return >= 0 on success
610  * @see AVInputFormat::read_seek
611  */
612 int64_t avio_seek_time(AVIOContext *h, int stream_index,
613  int64_t timestamp, int flags);
614 
615 /* Avoid a warning. The header can not be included because it breaks c++. */
616 struct AVBPrint;
617 
618 /**
619  * Read contents of h into print buffer, up to max_size bytes, or up to EOF.
620  *
621  * @return 0 for success (max_size bytes read or EOF reached), negative error
622  * code otherwise
623  */
624 int avio_read_to_bprint(AVIOContext *h, struct AVBPrint *pb, size_t max_size);
625 
626 #endif /* AVFORMAT_AVIO_H */
int avio_open(AVIOContext **s, const char *url, int flags)
Create and initialize a AVIOContext for accessing the resource indicated by url.
Definition: aviobuf.c:909
void avio_wb64(AVIOContext *s, uint64_t val)
Definition: aviobuf.c:410
const char const char void * val
Definition: avisynth_c.h:634
void avio_wl16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:416
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:281
int64_t(* read_seek)(void *opaque, int stream_index, int64_t timestamp, int flags)
Seek to a given timestamp in stream with the specified stream_index.
Definition: avio.h:155
int avio_put_str16be(AVIOContext *s, const char *str)
Convert an UTF-8 string to UTF-16BE and write it.
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:1125
int64_t filemode
Unix file mode, -1 if unknown.
Definition: avio.h:92
const char * fmt
Definition: avisynth_c.h:632
unsigned char * buf_ptr
Current position in the buffer.
Definition: avio.h:127
int writeout_count
writeout statistic This field is internal to libavformat and access from outside is not allowed...
Definition: avio.h:191
unsigned char * buf_end
End of the data, may be less than buffer+buffer_size if the read function returned less data than req...
Definition: avio.h:128
int write_flag
true if open for writing
Definition: avio.h:140
int avio_read_to_bprint(AVIOContext *h, struct AVBPrint *pb, size_t max_size)
Read contents of h into print buffer, up to max_size bytes, or up to EOF.
Definition: aviobuf.c:1002
Describes single entry of the directory.
Definition: avio.h:78
const char * b
Definition: vf_curves.c:109
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:203
unsigned char * buffer
Start of the buffer.
Definition: avio.h:125
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:276
int64_t(* seek)(void *opaque, int64_t offset, int whence)
Definition: avio.h:136
void * opaque
A private pointer, passed to the read/write/seek/...
Definition: avio.h:132
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:674
int64_t maxsize
max filesize, used to limit allocations This field is internal to libavformat and access from outside...
Definition: avio.h:166
int avio_get_str16le(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a UTF-16 string from pb and convert it to UTF-8.
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
Definition: aviobuf.c:1113
void * opaque
Definition: avio.h:52
int64_t modification_timestamp
Time of last modification in microseconds since unix epoch, -1 if unknown.
Definition: avio.h:84
Public dictionary API.
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:318
uint8_t
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:689
const AVClass * av_class
A class for private options.
Definition: avio.h:124
int64_t bytes_read
Bytes read statistic This field is internal to libavformat and access from outside is not allowed...
Definition: avio.h:179
ptrdiff_t size
Definition: opengl_enc.c:101
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:756
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:365
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:177
const OptionDef options[]
Definition: ffserver.c:3798
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:537
int avio_check(const char *url, int flags)
Return AVIO_FLAG_* access flags corresponding to the access permissions of the resource in url...
Definition: avio.c:405
void avio_wl64(AVIOContext *s, uint64_t val)
Definition: aviobuf.c:404
int max_packet_size
Definition: avio.h:141
Callback for checking whether to abort blocking functions.
Definition: avio.h:50
AVIOContext * avio_alloc_context(unsigned char *buffer, int buffer_size, int write_flag, void *opaque, int(*read_packet)(void *opaque, uint8_t *buf, int buf_size), int(*write_packet)(void *opaque, uint8_t *buf, int buf_size), int64_t(*seek)(void *opaque, int64_t offset, int whence))
Allocate and initialize an AVIOContext for buffered I/O.
Definition: aviobuf.c:111
char * name
Filename.
Definition: avio.h:79
int(* write_packet)(void *opaque, uint8_t *buf, int buf_size)
Definition: avio.h:135
int(* callback)(void *)
Definition: avio.h:51
const AVIOInterruptCB int_cb
Definition: ffmpeg.c:424
int(* read_packet)(void *opaque, uint8_t *buf, int buf_size)
Definition: avio.h:134
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:658
const char * avio_enum_protocols(void **opaque, int output)
Iterate through names of available protocols.
Definition: avio.c:87
int avio_close(AVIOContext *s)
Close the resource accessed by the AVIOContext s and free it.
Definition: aviobuf.c:937
int utf8
Set to 1 when name is encoded with UTF-8, 0 otherwise.
Definition: avio.h:81
unsigned long checksum
Definition: avio.h:142
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
int direct
avio_read and avio_write should if possible be satisfied directly instead of going through a buffer...
Definition: avio.h:173
#define av_printf_format(fmtpos, attrpos)
Definition: attributes.h:148
int seek_count
seek statistic This field is internal to libavformat and access from outside is not allowed...
Definition: avio.h:185
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:528
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:160
int void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:197
unsigned int avio_rb24(AVIOContext *s)
Definition: aviobuf.c:682
void avio_free_directory_entry(AVIODirEntry **entry)
Free entry allocated by avio_read_dir().
Definition: avio.c:489
int64_t access_timestamp
Time of last access in microseconds since unix epoch, -1 if unknown.
Definition: avio.h:86
unsigned char * checksum_ptr
Definition: avio.h:143
void avio_wb24(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:434
int must_flush
true if the next seek should flush
Definition: avio.h:138
Libavformat version macros.
unsigned long(* update_checksum)(unsigned long checksum, const uint8_t *buf, unsigned int size)
Definition: avio.h:144
int64_t size
File size in bytes, -1 if unknown.
Definition: avio.h:83
int buffer_size
Maximum buffer size.
Definition: avio.h:126
int avio_put_str(AVIOContext *s, const char *str)
Write a NULL-terminated string.
Definition: aviobuf.c:334
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int type
Type of the entry.
Definition: avio.h:80
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:155
void * buf
Definition: avisynth_c.h:553
Definition: url.h:39
Describe the class of an AVClass context structure.
Definition: log.h:67
int64_t group_id
Group ID of owner, -1 if unknown.
Definition: avio.h:91
const char * avio_find_protocol_name(const char *url)
Return the name of the protocol that will handle the passed URL.
Definition: avio.c:398
int avio_put_str16le(AVIOContext *s, const char *str)
Convert an UTF-8 string to UTF-16LE and write it.
int avio_open2(AVIOContext **s, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)
Create and initialize a AVIOContext for accessing the resource indicated by url.
Definition: aviobuf.c:914
int avio_close_dir(AVIODirContext **s)
Close directory.
Definition: avio.c:474
int error
contains the error code or 0 if no error happened
Definition: avio.h:145
void avio_wl24(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:428
int avio_pause(AVIOContext *h, int pause)
Pause and resume playing - only meaningful if using a network streaming protocol (e.g.
Definition: aviobuf.c:975
int(* read_pause)(void *opaque, int pause)
Pause or resume playback for network streaming protocols - e.g.
Definition: avio.h:149
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:422
static int flags
Definition: cpu.c:47
#define attribute_deprecated
Definition: attributes.h:86
int orig_buffer_size
Original buffer size used internally after probing and ensure seekback to reset the buffer size This ...
Definition: avio.h:198
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:642
common internal and external API header
int avio_get_str16be(AVIOContext *pb, int maxlen, char *buf, int buflen)
int64_t status_change_timestamp
Time of last status change in microseconds since unix epoch, -1 if unknown.
Definition: avio.h:88
AVIODirEntryType
Directory entry types.
Definition: avio.h:58
int64_t pos
position in the file of the current buffer
Definition: avio.h:137
int64_t avio_seek_time(AVIOContext *h, int stream_index, int64_t timestamp, int flags)
Seek to a given timestamp relative to some component stream.
Definition: aviobuf.c:982
int avio_read_dir(AVIODirContext *s, AVIODirEntry **next)
Get next directory entry.
Definition: avio.c:461
int eof_reached
true if eof reached
Definition: avio.h:139
int64_t user_id
User ID of owner, -1 if unknown.
Definition: avio.h:90
int avio_open_dir(AVIODirContext **s, const char *url, AVDictionary **options)
Open directory for reading.
Definition: avio.c:424
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:326
#define av_always_inline
Definition: attributes.h:37
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:714
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:300
unsigned int avio_rl24(AVIOContext *s)
Definition: aviobuf.c:650
struct URLContext * url_context
Definition: avio.h:96
int avio_closep(AVIOContext **s)
Close the resource accessed by the AVIOContext *s, free it and set the pointer pointing to it to NULL...
Definition: aviobuf.c:955
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:666
static int write_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: v4l2enc.c:86
GLuint buffer
Definition: opengl_enc.c:102
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2