--- a/misc/winutils/include/libavformat/avio.h Sat Aug 31 22:30:29 2019 +0300
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,433 +0,0 @@
-/*
- * copyright (c) 2001 Fabrice Bellard
- *
- * This file is part of Libav.
- *
- * Libav is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * Libav is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-#ifndef AVFORMAT_AVIO_H
-#define AVFORMAT_AVIO_H
-
-/**
- * @file
- * @ingroup lavf_io
- * Buffered I/O operations
- */
-
-#include <stdint.h>
-
-#include "libavutil/common.h"
-#include "libavutil/dict.h"
-#include "libavutil/log.h"
-
-#include "libavformat/version.h"
-
-
-#define AVIO_SEEKABLE_NORMAL 0x0001 /**< Seeking works like for a local file */
-
-/**
- * Callback for checking whether to abort blocking functions.
- * AVERROR_EXIT is returned in this case by the interrupted
- * function. During blocking operations, callback is called with
- * opaque as parameter. If the callback returns 1, the
- * blocking operation will be aborted.
- *
- * No members can be added to this struct without a major bump, if
- * new elements have been added after this struct in AVFormatContext
- * or AVIOContext.
- */
-typedef struct AVIOInterruptCB {
- int (*callback)(void*);
- void *opaque;
-} AVIOInterruptCB;
-
-/**
- * Bytestream IO Context.
- * New fields can be added to the end with minor version bumps.
- * Removal, reordering and changes to existing fields require a major
- * version bump.
- * sizeof(AVIOContext) must not be used outside libav*.
- *
- * @note None of the function pointers in AVIOContext should be called
- * directly, they should only be set by the client application
- * when implementing custom I/O. Normally these are set to the
- * function pointers specified in avio_alloc_context()
- */
-typedef struct AVIOContext {
- /**
- * A class for private options.
- *
- * If this AVIOContext is created by avio_open2(), av_class is set and
- * passes the options down to protocols.
- *
- * If this AVIOContext is manually allocated, then av_class may be set by
- * the caller.
- *
- * warning -- this field can be NULL, be sure to not pass this AVIOContext
- * to any av_opt_* functions in that case.
- */
- const AVClass *av_class;
- unsigned char *buffer; /**< Start of the buffer. */
- int buffer_size; /**< Maximum buffer size */
- unsigned char *buf_ptr; /**< Current position in the buffer */
- unsigned char *buf_end; /**< End of the data, may be less than
- buffer+buffer_size if the read function returned
- less data than requested, e.g. for streams where
- no more data has been received yet. */
- void *opaque; /**< A private pointer, passed to the read/write/seek/...
- functions. */
- 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);
- int64_t pos; /**< position in the file of the current buffer */
- int must_flush; /**< true if the next seek should flush */
- int eof_reached; /**< true if eof reached */
- int write_flag; /**< true if open for writing */
- int max_packet_size;
- unsigned long checksum;
- unsigned char *checksum_ptr;
- unsigned long (*update_checksum)(unsigned long checksum, const uint8_t *buf, unsigned int size);
- int error; /**< contains the error code or 0 if no error happened */
- /**
- * Pause or resume playback for network streaming protocols - e.g. MMS.
- */
- int (*read_pause)(void *opaque, int pause);
- /**
- * Seek to a given timestamp in stream with the specified stream_index.
- * Needed for some network streaming protocols which don't support seeking
- * to byte position.
- */
- int64_t (*read_seek)(void *opaque, int stream_index,
- int64_t timestamp, int flags);
- /**
- * A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
- */
- int seekable;
-} AVIOContext;
-
-/* unbuffered I/O */
-
-/**
- * Return AVIO_FLAG_* access flags corresponding to the access permissions
- * of the resource in url, or a negative value corresponding to an
- * AVERROR code in case of failure. The returned access flags are
- * masked by the value in flags.
- *
- * @note This function is intrinsically unsafe, in the sense that the
- * checked resource may change its existence or permission status from
- * one call to another. Thus you should not trust the returned value,
- * unless you are sure that no other processes are accessing the
- * checked resource.
- */
-int avio_check(const char *url, int flags);
-
-/**
- * Allocate and initialize an AVIOContext for buffered I/O. It must be later
- * freed with av_free().
- *
- * @param buffer Memory block for input/output operations via AVIOContext.
- * The buffer must be allocated with av_malloc() and friends.
- * @param buffer_size The buffer size is very important for performance.
- * For protocols with fixed blocksize it should be set to this blocksize.
- * For others a typical size is a cache page, e.g. 4kb.
- * @param write_flag Set to 1 if the buffer should be writable, 0 otherwise.
- * @param opaque An opaque pointer to user-specific data.
- * @param read_packet A function for refilling the buffer, may be NULL.
- * @param write_packet A function for writing the buffer contents, may be NULL.
- * @param seek A function for seeking to specified byte position, may be NULL.
- *
- * @return Allocated AVIOContext or NULL on failure.
- */
-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));
-
-void avio_w8(AVIOContext *s, int b);
-void avio_write(AVIOContext *s, const unsigned char *buf, int size);
-void avio_wl64(AVIOContext *s, uint64_t val);
-void avio_wb64(AVIOContext *s, uint64_t val);
-void avio_wl32(AVIOContext *s, unsigned int val);
-void avio_wb32(AVIOContext *s, unsigned int val);
-void avio_wl24(AVIOContext *s, unsigned int val);
-void avio_wb24(AVIOContext *s, unsigned int val);
-void avio_wl16(AVIOContext *s, unsigned int val);
-void avio_wb16(AVIOContext *s, unsigned int val);
-
-/**
- * Write a NULL-terminated string.
- * @return number of bytes written.
- */
-int avio_put_str(AVIOContext *s, const char *str);
-
-/**
- * Convert an UTF-8 string to UTF-16LE and write it.
- * @return number of bytes written.
- */
-int avio_put_str16le(AVIOContext *s, const char *str);
-
-/**
- * Passing this as the "whence" parameter to a seek function causes it to
- * return the filesize without seeking anywhere. Supporting this is optional.
- * If it is not supported then the seek function will return <0.
- */
-#define AVSEEK_SIZE 0x10000
-
-/**
- * Oring this flag as into the "whence" parameter to a seek function causes it to
- * seek by any means (like reopening and linear reading) or other normally unreasonble
- * means that can be extreemly slow.
- * This may be ignored by the seek code.
- */
-#define AVSEEK_FORCE 0x20000
-
-/**
- * fseek() equivalent for AVIOContext.
- * @return new position or AVERROR.
- */
-int64_t avio_seek(AVIOContext *s, int64_t offset, int whence);
-
-/**
- * Skip given number of bytes forward
- * @return new position or AVERROR.
- */
-static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
-{
- return avio_seek(s, offset, SEEK_CUR);
-}
-
-/**
- * ftell() equivalent for AVIOContext.
- * @return position or AVERROR.
- */
-static av_always_inline int64_t avio_tell(AVIOContext *s)
-{
- return avio_seek(s, 0, SEEK_CUR);
-}
-
-/**
- * Get the filesize.
- * @return filesize or AVERROR
- */
-int64_t avio_size(AVIOContext *s);
-
-/** @warning currently size is limited */
-int avio_printf(AVIOContext *s, const char *fmt, ...) av_printf_format(2, 3);
-
-void avio_flush(AVIOContext *s);
-
-
-/**
- * Read size bytes from AVIOContext into buf.
- * @return number of bytes read or AVERROR
- */
-int avio_read(AVIOContext *s, unsigned char *buf, int size);
-
-/**
- * @name Functions for reading from AVIOContext
- * @{
- *
- * @note return 0 if EOF, so you cannot use it if EOF handling is
- * necessary
- */
-int avio_r8 (AVIOContext *s);
-unsigned int avio_rl16(AVIOContext *s);
-unsigned int avio_rl24(AVIOContext *s);
-unsigned int avio_rl32(AVIOContext *s);
-uint64_t avio_rl64(AVIOContext *s);
-unsigned int avio_rb16(AVIOContext *s);
-unsigned int avio_rb24(AVIOContext *s);
-unsigned int avio_rb32(AVIOContext *s);
-uint64_t avio_rb64(AVIOContext *s);
-/**
- * @}
- */
-
-/**
- * Read a string from pb into buf. The reading will terminate when either
- * a NULL character was encountered, maxlen bytes have been read, or nothing
- * more can be read from pb. The result is guaranteed to be NULL-terminated, it
- * will be truncated if buf is too small.
- * Note that the string is not interpreted or validated in any way, it
- * might get truncated in the middle of a sequence for multi-byte encodings.
- *
- * @return number of bytes read (is always <= maxlen).
- * If reading ends on EOF or error, the return value will be one more than
- * bytes actually read.
- */
-int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen);
-
-/**
- * Read a UTF-16 string from pb and convert it to UTF-8.
- * The reading will terminate when either a null or invalid character was
- * encountered or maxlen bytes have been read.
- * @return number of bytes read (is always <= maxlen)
- */
-int avio_get_str16le(AVIOContext *pb, int maxlen, char *buf, int buflen);
-int avio_get_str16be(AVIOContext *pb, int maxlen, char *buf, int buflen);
-
-
-/**
- * @name URL open modes
- * The flags argument to avio_open must be one of the following
- * constants, optionally ORed with other flags.
- * @{
- */
-#define AVIO_FLAG_READ 1 /**< read-only */
-#define AVIO_FLAG_WRITE 2 /**< write-only */
-#define AVIO_FLAG_READ_WRITE (AVIO_FLAG_READ|AVIO_FLAG_WRITE) /**< read-write pseudo flag */
-/**
- * @}
- */
-
-/**
- * Use non-blocking mode.
- * If this flag is set, operations on the context will return
- * AVERROR(EAGAIN) if they can not be performed immediately.
- * If this flag is not set, operations on the context will never return
- * AVERROR(EAGAIN).
- * Note that this flag does not affect the opening/connecting of the
- * context. Connecting a protocol will always block if necessary (e.g. on
- * network protocols) but never hang (e.g. on busy devices).
- * Warning: non-blocking protocols is work-in-progress; this flag may be
- * silently ignored.
- */
-#define AVIO_FLAG_NONBLOCK 8
-
-/**
- * Create and initialize a AVIOContext for accessing the
- * resource indicated by url.
- * @note When the resource indicated by url has been opened in
- * read+write mode, the AVIOContext can be used only for writing.
- *
- * @param s Used to return the pointer to the created AVIOContext.
- * In case of failure the pointed to value is set to NULL.
- * @param flags flags which control how the resource indicated by url
- * is to be opened
- * @return 0 in case of success, a negative value corresponding to an
- * AVERROR code in case of failure
- */
-int avio_open(AVIOContext **s, const char *url, int flags);
-
-/**
- * Create and initialize a AVIOContext for accessing the
- * resource indicated by url.
- * @note When the resource indicated by url has been opened in
- * read+write mode, the AVIOContext can be used only for writing.
- *
- * @param s Used to return the pointer to the created AVIOContext.
- * In case of failure the pointed to value is set to NULL.
- * @param flags flags which control how the resource indicated by url
- * is to be opened
- * @param int_cb an interrupt callback to be used at the protocols level
- * @param options A dictionary filled with protocol-private options. On return
- * this parameter will be destroyed and replaced with a dict containing options
- * that were not found. May be NULL.
- * @return 0 in case of success, a negative value corresponding to an
- * AVERROR code in case of failure
- */
-int avio_open2(AVIOContext **s, const char *url, int flags,
- const AVIOInterruptCB *int_cb, AVDictionary **options);
-
-/**
- * Close the resource accessed by the AVIOContext s and free it.
- * This function can only be used if s was opened by avio_open().
- *
- * The internal buffer is automatically flushed before closing the
- * resource.
- *
- * @return 0 on success, an AVERROR < 0 on error.
- * @see avio_closep
- */
-int avio_close(AVIOContext *s);
-
-/**
- * Close the resource accessed by the AVIOContext *s, free it
- * and set the pointer pointing to it to NULL.
- * This function can only be used if s was opened by avio_open().
- *
- * The internal buffer is automatically flushed before closing the
- * resource.
- *
- * @return 0 on success, an AVERROR < 0 on error.
- * @see avio_close
- */
-int avio_closep(AVIOContext **s);
-
-
-/**
- * Open a write only memory stream.
- *
- * @param s new IO context
- * @return zero if no error.
- */
-int avio_open_dyn_buf(AVIOContext **s);
-
-/**
- * Return the written size and a pointer to the buffer. The buffer
- * must be freed with av_free().
- * Padding of FF_INPUT_BUFFER_PADDING_SIZE is added to the buffer.
- *
- * @param s IO context
- * @param pbuffer pointer to a byte buffer
- * @return the length of the byte buffer
- */
-int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer);
-
-/**
- * Iterate through names of available protocols.
- *
- * @param opaque A private pointer representing current protocol.
- * It must be a pointer to NULL on first iteration and will
- * be updated by successive calls to avio_enum_protocols.
- * @param output If set to 1, iterate over output protocols,
- * otherwise over input protocols.
- *
- * @return A static string containing the name of current protocol or NULL
- */
-const char *avio_enum_protocols(void **opaque, int output);
-
-/**
- * Pause and resume playing - only meaningful if using a network streaming
- * protocol (e.g. MMS).
- * @param pause 1 for pause, 0 for resume
- */
-int avio_pause(AVIOContext *h, int pause);
-
-/**
- * Seek to a given timestamp relative to some component stream.
- * Only meaningful if using a network streaming protocol (e.g. MMS.).
- * @param stream_index The stream index that the timestamp is relative to.
- * If stream_index is (-1) the timestamp should be in AV_TIME_BASE
- * units from the beginning of the presentation.
- * If a stream_index >= 0 is used and the protocol does not support
- * seeking based on component streams, the call will fail with ENOTSUP.
- * @param timestamp timestamp in AVStream.time_base units
- * or if there is no stream specified then in AV_TIME_BASE units.
- * @param flags Optional combination of AVSEEK_FLAG_BACKWARD, AVSEEK_FLAG_BYTE
- * and AVSEEK_FLAG_ANY. The protocol may silently ignore
- * AVSEEK_FLAG_BACKWARD and AVSEEK_FLAG_ANY, but AVSEEK_FLAG_BYTE will
- * fail with ENOTSUP if used and not supported.
- * @return >= 0 on success
- * @see AVInputFormat::read_seek
- */
-int64_t avio_seek_time(AVIOContext *h, int stream_index,
- int64_t timestamp, int flags);
-
-#endif /* AVFORMAT_AVIO_H */