author | Wuzzy <almikes@aol.com> |
Sat, 15 Apr 2017 06:52:14 +0200 | |
changeset 12256 | 789277d46784 |
parent 7813 | 7ac83d79b897 |
permissions | -rw-r--r-- |
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/* |
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* copyright (c) 2001 Fabrice Bellard |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVFORMAT_AVIO_H |
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#define AVFORMAT_AVIO_H |
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/** |
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* @file |
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* @ingroup lavf_io |
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* Buffered I/O operations |
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*/ |
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#include <stdint.h> |
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#include "libavutil/common.h" |
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#include "libavutil/dict.h" |
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#include "libavutil/log.h" |
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#include "libavformat/version.h" |
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#define AVIO_SEEKABLE_NORMAL 0x0001 /**< Seeking works like for a local file */ |
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/** |
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* Callback for checking whether to abort blocking functions. |
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* AVERROR_EXIT is returned in this case by the interrupted |
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* function. During blocking operations, callback is called with |
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* opaque as parameter. If the callback returns 1, the |
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* blocking operation will be aborted. |
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* |
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* No members can be added to this struct without a major bump, if |
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* new elements have been added after this struct in AVFormatContext |
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* or AVIOContext. |
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*/ |
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typedef struct AVIOInterruptCB { |
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int (*callback)(void*); |
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void *opaque; |
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} AVIOInterruptCB; |
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/** |
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* Bytestream IO Context. |
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* New fields can be added to the end with minor version bumps. |
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* Removal, reordering and changes to existing fields require a major |
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* version bump. |
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* sizeof(AVIOContext) must not be used outside libav*. |
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* |
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* @note None of the function pointers in AVIOContext should be called |
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* directly, they should only be set by the client application |
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* when implementing custom I/O. Normally these are set to the |
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* function pointers specified in avio_alloc_context() |
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*/ |
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typedef struct AVIOContext { |
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/** |
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* A class for private options. |
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* |
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* If this AVIOContext is created by avio_open2(), av_class is set and |
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* passes the options down to protocols. |
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* |
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* If this AVIOContext is manually allocated, then av_class may be set by |
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* the caller. |
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* |
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* warning -- this field can be NULL, be sure to not pass this AVIOContext |
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* to any av_opt_* functions in that case. |
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*/ |
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const AVClass *av_class; |
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unsigned char *buffer; /**< Start of the buffer. */ |
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int buffer_size; /**< Maximum buffer size */ |
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unsigned char *buf_ptr; /**< Current position in the buffer */ |
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unsigned char *buf_end; /**< End of the data, may be less than |
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buffer+buffer_size if the read function returned |
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less data than requested, e.g. for streams where |
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no more data has been received yet. */ |
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void *opaque; /**< A private pointer, passed to the read/write/seek/... |
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functions. */ |
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size); |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size); |
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int64_t (*seek)(void *opaque, int64_t offset, int whence); |
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int64_t pos; /**< position in the file of the current buffer */ |
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int must_flush; /**< true if the next seek should flush */ |
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int eof_reached; /**< true if eof reached */ |
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int write_flag; /**< true if open for writing */ |
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int max_packet_size; |
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unsigned long checksum; |
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unsigned char *checksum_ptr; |
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unsigned long (*update_checksum)(unsigned long checksum, const uint8_t *buf, unsigned int size); |
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int error; /**< contains the error code or 0 if no error happened */ |
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/** |
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* Pause or resume playback for network streaming protocols - e.g. MMS. |
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*/ |
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int (*read_pause)(void *opaque, int pause); |
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/** |
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* Seek to a given timestamp in stream with the specified stream_index. |
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* Needed for some network streaming protocols which don't support seeking |
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* to byte position. |
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*/ |
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int64_t (*read_seek)(void *opaque, int stream_index, |
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int64_t timestamp, int flags); |
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/** |
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* A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable. |
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*/ |
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int seekable; |
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} AVIOContext; |
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/* unbuffered I/O */ |
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/** |
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* Return AVIO_FLAG_* access flags corresponding to the access permissions |
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* of the resource in url, or a negative value corresponding to an |
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* AVERROR code in case of failure. The returned access flags are |
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* masked by the value in flags. |
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* |
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* @note This function is intrinsically unsafe, in the sense that the |
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* checked resource may change its existence or permission status from |
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* one call to another. Thus you should not trust the returned value, |
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* unless you are sure that no other processes are accessing the |
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* checked resource. |
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*/ |
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int avio_check(const char *url, int flags); |
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/** |
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* Allocate and initialize an AVIOContext for buffered I/O. It must be later |
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* freed with av_free(). |
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* |
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* @param buffer Memory block for input/output operations via AVIOContext. |
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* The buffer must be allocated with av_malloc() and friends. |
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* @param buffer_size The buffer size is very important for performance. |
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* For protocols with fixed blocksize it should be set to this blocksize. |
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* For others a typical size is a cache page, e.g. 4kb. |
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* @param write_flag Set to 1 if the buffer should be writable, 0 otherwise. |
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* @param opaque An opaque pointer to user-specific data. |
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* @param read_packet A function for refilling the buffer, may be NULL. |
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* @param write_packet A function for writing the buffer contents, may be NULL. |
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* @param seek A function for seeking to specified byte position, may be NULL. |
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* |
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* @return Allocated AVIOContext or NULL on failure. |
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*/ |
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AVIOContext *avio_alloc_context( |
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unsigned char *buffer, |
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int buffer_size, |
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int write_flag, |
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void *opaque, |
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int64_t (*seek)(void *opaque, int64_t offset, int whence)); |
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void avio_w8(AVIOContext *s, int b); |
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void avio_write(AVIOContext *s, const unsigned char *buf, int size); |
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void avio_wl64(AVIOContext *s, uint64_t val); |
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void avio_wb64(AVIOContext *s, uint64_t val); |
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void avio_wl32(AVIOContext *s, unsigned int val); |
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void avio_wb32(AVIOContext *s, unsigned int val); |
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void avio_wl24(AVIOContext *s, unsigned int val); |
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void avio_wb24(AVIOContext *s, unsigned int val); |
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void avio_wl16(AVIOContext *s, unsigned int val); |
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void avio_wb16(AVIOContext *s, unsigned int val); |
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|
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/** |
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* Write a NULL-terminated string. |
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* @return number of bytes written. |
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*/ |
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int avio_put_str(AVIOContext *s, const char *str); |
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/** |
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* Convert an UTF-8 string to UTF-16LE and write it. |
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* @return number of bytes written. |
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*/ |
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int avio_put_str16le(AVIOContext *s, const char *str); |
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|
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/** |
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* Passing this as the "whence" parameter to a seek function causes it to |
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* return the filesize without seeking anywhere. Supporting this is optional. |
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* If it is not supported then the seek function will return <0. |
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*/ |
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#define AVSEEK_SIZE 0x10000 |
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|
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/** |
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* Oring this flag as into the "whence" parameter to a seek function causes it to |
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* seek by any means (like reopening and linear reading) or other normally unreasonble |
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* means that can be extreemly slow. |
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* This may be ignored by the seek code. |
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*/ |
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#define AVSEEK_FORCE 0x20000 |
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|
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/** |
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* fseek() equivalent for AVIOContext. |
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* @return new position or AVERROR. |
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*/ |
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int64_t avio_seek(AVIOContext *s, int64_t offset, int whence); |
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|
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/** |
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* Skip given number of bytes forward |
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* @return new position or AVERROR. |
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*/ |
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static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset) |
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{ |
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return avio_seek(s, offset, SEEK_CUR); |
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} |
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|
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/** |
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* ftell() equivalent for AVIOContext. |
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* @return position or AVERROR. |
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*/ |
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static av_always_inline int64_t avio_tell(AVIOContext *s) |
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{ |
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return avio_seek(s, 0, SEEK_CUR); |
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} |
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|
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/** |
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* Get the filesize. |
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* @return filesize or AVERROR |
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*/ |
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int64_t avio_size(AVIOContext *s); |
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|
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/** @warning currently size is limited */ |
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int avio_printf(AVIOContext *s, const char *fmt, ...) av_printf_format(2, 3); |
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|
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void avio_flush(AVIOContext *s); |
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|
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|
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/** |
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* Read size bytes from AVIOContext into buf. |
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* @return number of bytes read or AVERROR |
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*/ |
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int avio_read(AVIOContext *s, unsigned char *buf, int size); |
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|
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/** |
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* @name Functions for reading from AVIOContext |
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* @{ |
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* |
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* @note return 0 if EOF, so you cannot use it if EOF handling is |
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* necessary |
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*/ |
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int avio_r8 (AVIOContext *s); |
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unsigned int avio_rl16(AVIOContext *s); |
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unsigned int avio_rl24(AVIOContext *s); |
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unsigned int avio_rl32(AVIOContext *s); |
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uint64_t avio_rl64(AVIOContext *s); |
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unsigned int avio_rb16(AVIOContext *s); |
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unsigned int avio_rb24(AVIOContext *s); |
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unsigned int avio_rb32(AVIOContext *s); |
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uint64_t avio_rb64(AVIOContext *s); |
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/** |
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* @} |
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*/ |
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|
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/** |
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* Read a string from pb into buf. The reading will terminate when either |
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* a NULL character was encountered, maxlen bytes have been read, or nothing |
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* more can be read from pb. The result is guaranteed to be NULL-terminated, it |
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* will be truncated if buf is too small. |
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* Note that the string is not interpreted or validated in any way, it |
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* might get truncated in the middle of a sequence for multi-byte encodings. |
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* |
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* @return number of bytes read (is always <= maxlen). |
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* If reading ends on EOF or error, the return value will be one more than |
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* bytes actually read. |
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*/ |
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int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen); |
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|
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/** |
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* Read a UTF-16 string from pb and convert it to UTF-8. |
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* The reading will terminate when either a null or invalid character was |
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* encountered or maxlen bytes have been read. |
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* @return number of bytes read (is always <= maxlen) |
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*/ |
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int avio_get_str16le(AVIOContext *pb, int maxlen, char *buf, int buflen); |
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int avio_get_str16be(AVIOContext *pb, int maxlen, char *buf, int buflen); |
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|
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|
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/** |
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* @name URL open modes |
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* The flags argument to avio_open must be one of the following |
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* constants, optionally ORed with other flags. |
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* @{ |
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*/ |
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#define AVIO_FLAG_READ 1 /**< read-only */ |
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#define AVIO_FLAG_WRITE 2 /**< write-only */ |
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#define AVIO_FLAG_READ_WRITE (AVIO_FLAG_READ|AVIO_FLAG_WRITE) /**< read-write pseudo flag */ |
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/** |
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* @} |
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*/ |
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|
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/** |
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* Use non-blocking mode. |
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* If this flag is set, operations on the context will return |
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* AVERROR(EAGAIN) if they can not be performed immediately. |
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* If this flag is not set, operations on the context will never return |
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* AVERROR(EAGAIN). |
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305 |
* Note that this flag does not affect the opening/connecting of the |
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* context. Connecting a protocol will always block if necessary (e.g. on |
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* network protocols) but never hang (e.g. on busy devices). |
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* Warning: non-blocking protocols is work-in-progress; this flag may be |
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* silently ignored. |
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*/ |
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#define AVIO_FLAG_NONBLOCK 8 |
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|
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/** |
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* Create and initialize a AVIOContext for accessing the |
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* resource indicated by url. |
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* @note When the resource indicated by url has been opened in |
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* read+write mode, the AVIOContext can be used only for writing. |
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* |
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* @param s Used to return the pointer to the created AVIOContext. |
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* In case of failure the pointed to value is set to NULL. |
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* @param flags flags which control how the resource indicated by url |
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* is to be opened |
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* @return 0 in case of success, a negative value corresponding to an |
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* AVERROR code in case of failure |
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*/ |
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int avio_open(AVIOContext **s, const char *url, int flags); |
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|
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328 |
/** |
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|
329 |
* Create and initialize a AVIOContext for accessing the |
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|
330 |
* resource indicated by url. |
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331 |
* @note When the resource indicated by url has been opened in |
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|
332 |
* read+write mode, the AVIOContext can be used only for writing. |
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333 |
* |
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* @param s Used to return the pointer to the created AVIOContext. |
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335 |
* In case of failure the pointed to value is set to NULL. |
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336 |
* @param flags flags which control how the resource indicated by url |
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* is to be opened |
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338 |
* @param int_cb an interrupt callback to be used at the protocols level |
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|
339 |
* @param options A dictionary filled with protocol-private options. On return |
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|
340 |
* this parameter will be destroyed and replaced with a dict containing options |
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341 |
* that were not found. May be NULL. |
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342 |
* @return 0 in case of success, a negative value corresponding to an |
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343 |
* AVERROR code in case of failure |
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344 |
*/ |
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345 |
int avio_open2(AVIOContext **s, const char *url, int flags, |
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const AVIOInterruptCB *int_cb, AVDictionary **options); |
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|
347 |
|
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348 |
/** |
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349 |
* Close the resource accessed by the AVIOContext s and free it. |
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* This function can only be used if s was opened by avio_open(). |
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|
351 |
* |
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|
352 |
* The internal buffer is automatically flushed before closing the |
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353 |
* resource. |
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|
354 |
* |
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|
355 |
* @return 0 on success, an AVERROR < 0 on error. |
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|
356 |
* @see avio_closep |
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|
357 |
*/ |
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|
358 |
int avio_close(AVIOContext *s); |
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|
359 |
|
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|
360 |
/** |
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|
361 |
* Close the resource accessed by the AVIOContext *s, free it |
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|
362 |
* and set the pointer pointing to it to NULL. |
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|
363 |
* This function can only be used if s was opened by avio_open(). |
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|
364 |
* |
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|
365 |
* The internal buffer is automatically flushed before closing the |
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|
366 |
* resource. |
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|
367 |
* |
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|
368 |
* @return 0 on success, an AVERROR < 0 on error. |
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|
369 |
* @see avio_close |
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|
370 |
*/ |
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|
371 |
int avio_closep(AVIOContext **s); |
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|
372 |
|
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|
373 |
|
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|
374 |
/** |
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|
375 |
* Open a write only memory stream. |
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|
376 |
* |
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|
377 |
* @param s new IO context |
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|
378 |
* @return zero if no error. |
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|
379 |
*/ |
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|
380 |
int avio_open_dyn_buf(AVIOContext **s); |
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|
381 |
|
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|
382 |
/** |
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|
383 |
* Return the written size and a pointer to the buffer. The buffer |
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|
384 |
* must be freed with av_free(). |
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|
385 |
* Padding of FF_INPUT_BUFFER_PADDING_SIZE is added to the buffer. |
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|
386 |
* |
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|
387 |
* @param s IO context |
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|
388 |
* @param pbuffer pointer to a byte buffer |
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|
389 |
* @return the length of the byte buffer |
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|
390 |
*/ |
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|
391 |
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer); |
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|
392 |
|
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|
393 |
/** |
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|
394 |
* Iterate through names of available protocols. |
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|
395 |
* |
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|
396 |
* @param opaque A private pointer representing current protocol. |
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|
397 |
* It must be a pointer to NULL on first iteration and will |
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|
398 |
* be updated by successive calls to avio_enum_protocols. |
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|
399 |
* @param output If set to 1, iterate over output protocols, |
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|
400 |
* otherwise over input protocols. |
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|
401 |
* |
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|
402 |
* @return A static string containing the name of current protocol or NULL |
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|
403 |
*/ |
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|
404 |
const char *avio_enum_protocols(void **opaque, int output); |
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|
405 |
|
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|
406 |
/** |
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|
407 |
* Pause and resume playing - only meaningful if using a network streaming |
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|
408 |
* protocol (e.g. MMS). |
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|
409 |
* @param pause 1 for pause, 0 for resume |
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|
410 |
*/ |
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|
411 |
int avio_pause(AVIOContext *h, int pause); |
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|
412 |
|
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|
413 |
/** |
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|
414 |
* Seek to a given timestamp relative to some component stream. |
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|
415 |
* Only meaningful if using a network streaming protocol (e.g. MMS.). |
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|
416 |
* @param stream_index The stream index that the timestamp is relative to. |
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|
417 |
* If stream_index is (-1) the timestamp should be in AV_TIME_BASE |
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|
418 |
* units from the beginning of the presentation. |
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|
419 |
* If a stream_index >= 0 is used and the protocol does not support |
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|
420 |
* seeking based on component streams, the call will fail with ENOTSUP. |
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|
421 |
* @param timestamp timestamp in AVStream.time_base units |
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|
422 |
* or if there is no stream specified then in AV_TIME_BASE units. |
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|
423 |
* @param flags Optional combination of AVSEEK_FLAG_BACKWARD, AVSEEK_FLAG_BYTE |
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|
424 |
* and AVSEEK_FLAG_ANY. The protocol may silently ignore |
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|
425 |
* AVSEEK_FLAG_BACKWARD and AVSEEK_FLAG_ANY, but AVSEEK_FLAG_BYTE will |
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|
426 |
* fail with ENOTSUP if used and not supported. |
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|
427 |
* @return >= 0 on success |
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|
428 |
* @see AVInputFormat::read_seek |
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koda
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|
429 |
*/ |
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|
430 |
int64_t avio_seek_time(AVIOContext *h, int stream_index, |
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|
431 |
int64_t timestamp, int flags); |
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|
432 |
|
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|
433 |
#endif /* AVFORMAT_AVIO_H */ |