mirror of
https://github.com/cookiengineer/audacity
synced 2025-10-18 16:41:14 +02:00
Import headers of FFmpeg 2.2.2 into lib-src/ffmpeg.
This commit is contained in:
benjamin.drung@gmail.com
@@ -22,188 +22,206 @@
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/**
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* @file
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* unbuffered I/O operations
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*
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* @warning This file has to be considered an internal but installed
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* header, so it should not be directly included in your projects.
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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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/**
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* max filesize, used to limit allocations
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* This field is internal to libavformat and access from outside is not allowed.
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*/
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int64_t maxsize;
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/**
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* avio_read and avio_write should if possible be satisfied directly
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* instead of going through a buffer, and avio_seek will always
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* call the underlying seek function directly.
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*/
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int direct;
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/**
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* Bytes read statistic
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* This field is internal to libavformat and access from outside is not allowed.
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*/
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int64_t bytes_read;
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/**
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* seek statistic
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* This field is internal to libavformat and access from outside is not allowed.
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*/
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int seek_count;
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/**
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* writeout statistic
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* This field is internal to libavformat and access from outside is not allowed.
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*/
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int writeout_count;
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} AVIOContext;
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/* unbuffered I/O */
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/**
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* URL 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(URLContext) must not be used outside libav*.
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*/
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typedef struct URLContext {
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#if LIBAVFORMAT_VERSION_MAJOR >= 53
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const AVClass *av_class; ///< information for av_log(). Set by url_open().
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#endif
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struct URLProtocol *prot;
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int flags;
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int is_streamed; /**< true if streamed (no seek possible), default = false */
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int max_packet_size; /**< if non zero, the stream is packetized with this max packet size */
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void *priv_data;
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char *filename; /**< specified URL */
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} URLContext;
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typedef struct URLPollEntry {
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URLContext *handle;
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int events;
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int revents;
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} URLPollEntry;
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#define URL_RDONLY 0
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#define URL_WRONLY 1
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#define URL_RDWR 2
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typedef int URLInterruptCB(void);
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/**
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* Creates an URLContext for accessing to the resource indicated by
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* url, and opens it using the URLProtocol up.
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* Return the name of the protocol that will handle the passed URL.
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*
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* @param puc pointer to the location where, in case of success, the
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* function puts the pointer to the created URLContext
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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 url_open_protocol (URLContext **puc, struct URLProtocol *up,
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const char *url, int flags);
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/**
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* Creates an URLContext for accessing to the resource indicated by
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* url, and opens it.
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* NULL is returned if no protocol could be found for the given URL.
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*
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* @param puc pointer to the location where, in case of success, the
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* function puts the pointer to the created URLContext
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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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* @return Name of the protocol or NULL.
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*/
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int url_open(URLContext **h, const char *url, int flags);
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const char *avio_find_protocol_name(const char *url);
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/**
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* Reads up to size bytes from the resource accessed by h, and stores
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* the read bytes in buf.
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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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* @return The number of bytes actually read, or a negative value
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* corresponding to an AVERROR code in case of error. A value of zero
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* indicates that it is not possible to read more from the accessed
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* resource (except if the value of the size argument is also zero).
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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 url_read(URLContext *h, unsigned char *buf, int size);
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int avio_check(const char *url, int flags);
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/**
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* Read as many bytes as possible (up to size), calling the
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* read function multiple times if necessary.
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* Will also retry if the read function returns AVERROR(EAGAIN).
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* This makes special short-read handling in applications
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* unnecessary, if the return value is < size then it is
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* certain there was either an error or the end of file was reached.
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*/
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int url_read_complete(URLContext *h, unsigned char *buf, int size);
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int url_write(URLContext *h, unsigned char *buf, int size);
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/**
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* Changes the position that will be used by the next read/write
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* operation on the resource accessed by h.
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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 pos specifies the new position to set
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* @param whence specifies how pos should be interpreted, it must be
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* one of SEEK_SET (seek from the beginning), SEEK_CUR (seek from the
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* current position), SEEK_END (seek from the end), or AVSEEK_SIZE
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* (return the filesize of the requested resource, pos is ignored).
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* @return a negative value corresponding to an AVERROR code in case
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* of failure, or the resulting file position, measured in bytes from
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* the beginning of the file. You can use this feature together with
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* SEEK_CUR to read the current file position.
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*/
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int64_t url_seek(URLContext *h, int64_t pos, int whence);
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/**
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* Closes the resource accessed by the URLContext h, and frees the
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* memory used by it.
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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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* The function may not change the input buffers content.
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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 a negative value if an error condition occurred, 0
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* otherwise
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* @return Allocated AVIOContext or NULL on failure.
|
||||
*/
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int url_close(URLContext *h);
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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);
|
||||
|
||||
/**
|
||||
* Returns a non-zero value if the resource indicated by url
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* exists, 0 otherwise.
|
||||
* Write a NULL-terminated string.
|
||||
* @return number of bytes written.
|
||||
*/
|
||||
int url_exist(const char *url);
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|
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int64_t url_filesize(URLContext *h);
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||||
int avio_put_str(AVIOContext *s, const char *str);
|
||||
|
||||
/**
|
||||
* Return the file descriptor associated with this URL. For RTP, this
|
||||
* will return only the RTP file descriptor, not the RTCP file descriptor.
|
||||
* To get both, use rtp_get_file_handles().
|
||||
*
|
||||
* @return the file descriptor associated with this URL, or <0 on error.
|
||||
* Convert an UTF-8 string to UTF-16LE and write it.
|
||||
* @return number of bytes written.
|
||||
*/
|
||||
int url_get_file_handle(URLContext *h);
|
||||
|
||||
/**
|
||||
* Return the maximum packet size associated to packetized file
|
||||
* handle. If the file is not packetized (stream like HTTP or file on
|
||||
* disk), then 0 is returned.
|
||||
*
|
||||
* @param h file handle
|
||||
* @return maximum packet size in bytes
|
||||
*/
|
||||
int url_get_max_packet_size(URLContext *h);
|
||||
void url_get_filename(URLContext *h, char *buf, int buf_size);
|
||||
|
||||
/**
|
||||
* The callback is called in blocking functions to test regulary if
|
||||
* asynchronous interruption is needed. AVERROR(EINTR) is returned
|
||||
* in this case by the interrupted function. 'NULL' means no interrupt
|
||||
* callback is given.
|
||||
*/
|
||||
void url_set_interrupt_cb(URLInterruptCB *interrupt_cb);
|
||||
|
||||
/* not implemented */
|
||||
int url_poll(URLPollEntry *poll_table, int n, int timeout);
|
||||
|
||||
/**
|
||||
* Pause and resume playing - only meaningful if using a network streaming
|
||||
* protocol (e.g. MMS).
|
||||
* @param pause 1 for pause, 0 for resume
|
||||
*/
|
||||
int av_url_read_pause(URLContext *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 av_url_read_seek(URLContext *h, int stream_index,
|
||||
int64_t timestamp, int flags);
|
||||
int avio_put_str16le(AVIOContext *s, const char *str);
|
||||
|
||||
/**
|
||||
* Passing this as the "whence" parameter to a seek function causes it to
|
||||
@@ -214,271 +232,203 @@ int64_t av_url_read_seek(URLContext *h, int stream_index,
|
||||
|
||||
/**
|
||||
* 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.
|
||||
* seek by any means (like reopening and linear reading) or other normally unreasonable
|
||||
* means that can be extremely slow.
|
||||
* This may be ignored by the seek code.
|
||||
*/
|
||||
#define AVSEEK_FORCE 0x20000
|
||||
|
||||
typedef struct URLProtocol {
|
||||
const char *name;
|
||||
int (*url_open)(URLContext *h, const char *url, int flags);
|
||||
int (*url_read)(URLContext *h, unsigned char *buf, int size);
|
||||
int (*url_write)(URLContext *h, unsigned char *buf, int size);
|
||||
int64_t (*url_seek)(URLContext *h, int64_t pos, int whence);
|
||||
int (*url_close)(URLContext *h);
|
||||
struct URLProtocol *next;
|
||||
int (*url_read_pause)(URLContext *h, int pause);
|
||||
int64_t (*url_read_seek)(URLContext *h, int stream_index,
|
||||
int64_t timestamp, int flags);
|
||||
int (*url_get_file_handle)(URLContext *h);
|
||||
} URLProtocol;
|
||||
|
||||
#if LIBAVFORMAT_VERSION_MAJOR < 53
|
||||
extern URLProtocol *first_protocol;
|
||||
#endif
|
||||
|
||||
extern URLInterruptCB *url_interrupt_cb;
|
||||
|
||||
/**
|
||||
* If protocol is NULL, returns the first registered protocol,
|
||||
* if protocol is non-NULL, returns the next registered protocol after protocol,
|
||||
* or NULL if protocol is the last one.
|
||||
*/
|
||||
URLProtocol *av_protocol_next(URLProtocol *p);
|
||||
|
||||
#if LIBAVFORMAT_VERSION_MAJOR < 53
|
||||
/**
|
||||
* @deprecated Use av_register_protocol() instead.
|
||||
*/
|
||||
attribute_deprecated int register_protocol(URLProtocol *protocol);
|
||||
#endif
|
||||
|
||||
/**
|
||||
* Registers the URLProtocol protocol.
|
||||
*/
|
||||
int av_register_protocol(URLProtocol *protocol);
|
||||
|
||||
/**
|
||||
* 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(ByteIOContext) must not be used outside libav*.
|
||||
*/
|
||||
typedef struct {
|
||||
unsigned char *buffer;
|
||||
int buffer_size;
|
||||
unsigned char *buf_ptr, *buf_end;
|
||||
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);
|
||||
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 is_streamed;
|
||||
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
|
||||
int (*read_pause)(void *opaque, int pause);
|
||||
int64_t (*read_seek)(void *opaque, int stream_index,
|
||||
int64_t timestamp, int flags);
|
||||
} ByteIOContext;
|
||||
|
||||
int init_put_byte(ByteIOContext *s,
|
||||
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));
|
||||
ByteIOContext *av_alloc_put_byte(
|
||||
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 put_byte(ByteIOContext *s, int b);
|
||||
void put_buffer(ByteIOContext *s, const unsigned char *buf, int size);
|
||||
void put_le64(ByteIOContext *s, uint64_t val);
|
||||
void put_be64(ByteIOContext *s, uint64_t val);
|
||||
void put_le32(ByteIOContext *s, unsigned int val);
|
||||
void put_be32(ByteIOContext *s, unsigned int val);
|
||||
void put_le24(ByteIOContext *s, unsigned int val);
|
||||
void put_be24(ByteIOContext *s, unsigned int val);
|
||||
void put_le16(ByteIOContext *s, unsigned int val);
|
||||
void put_be16(ByteIOContext *s, unsigned int val);
|
||||
void put_tag(ByteIOContext *s, const char *tag);
|
||||
|
||||
void put_strz(ByteIOContext *s, const char *buf);
|
||||
|
||||
/**
|
||||
* fseek() equivalent for ByteIOContext.
|
||||
* fseek() equivalent for AVIOContext.
|
||||
* @return new position or AVERROR.
|
||||
*/
|
||||
int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence);
|
||||
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence);
|
||||
|
||||
/**
|
||||
* Skip given number of bytes forward.
|
||||
* @param offset number of bytes
|
||||
* Skip given number of bytes forward
|
||||
* @return new position or AVERROR.
|
||||
*/
|
||||
void url_fskip(ByteIOContext *s, int64_t offset);
|
||||
int64_t avio_skip(AVIOContext *s, int64_t offset);
|
||||
|
||||
/**
|
||||
* ftell() equivalent for ByteIOContext.
|
||||
* ftell() equivalent for AVIOContext.
|
||||
* @return position or AVERROR.
|
||||
*/
|
||||
int64_t url_ftell(ByteIOContext *s);
|
||||
|
||||
/**
|
||||
* Gets the filesize.
|
||||
* @return filesize or AVERROR
|
||||
*/
|
||||
int64_t url_fsize(ByteIOContext *s);
|
||||
|
||||
/**
|
||||
* feof() equivalent for ByteIOContext.
|
||||
* @return non zero if and only if end of file
|
||||
*/
|
||||
int url_feof(ByteIOContext *s);
|
||||
|
||||
int url_ferror(ByteIOContext *s);
|
||||
|
||||
int av_url_read_fpause(ByteIOContext *h, int pause);
|
||||
int64_t av_url_read_fseek(ByteIOContext *h, int stream_index,
|
||||
int64_t timestamp, int flags);
|
||||
|
||||
#define URL_EOF (-1)
|
||||
/** @note return URL_EOF (-1) if EOF */
|
||||
int url_fgetc(ByteIOContext *s);
|
||||
|
||||
/** @warning currently size is limited */
|
||||
#ifdef __GNUC__
|
||||
int url_fprintf(ByteIOContext *s, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 2, 3)));
|
||||
#else
|
||||
int url_fprintf(ByteIOContext *s, const char *fmt, ...);
|
||||
#endif
|
||||
|
||||
/** @note unlike fgets, the EOL character is not returned and a whole
|
||||
line is parsed. return NULL if first char read was EOF */
|
||||
char *url_fgets(ByteIOContext *s, char *buf, int buf_size);
|
||||
|
||||
void put_flush_packet(ByteIOContext *s);
|
||||
|
||||
|
||||
/**
|
||||
* Reads size bytes from ByteIOContext into buf.
|
||||
* @return number of bytes read or AVERROR
|
||||
*/
|
||||
int get_buffer(ByteIOContext *s, unsigned char *buf, int size);
|
||||
|
||||
/**
|
||||
* Reads size bytes from ByteIOContext into buf.
|
||||
* This reads at most 1 packet. If that is not enough fewer bytes will be
|
||||
* returned.
|
||||
* @return number of bytes read or AVERROR
|
||||
*/
|
||||
int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size);
|
||||
|
||||
/** @note return 0 if EOF, so you cannot use it if EOF handling is
|
||||
necessary */
|
||||
int get_byte(ByteIOContext *s);
|
||||
unsigned int get_le24(ByteIOContext *s);
|
||||
unsigned int get_le32(ByteIOContext *s);
|
||||
uint64_t get_le64(ByteIOContext *s);
|
||||
unsigned int get_le16(ByteIOContext *s);
|
||||
|
||||
char *get_strz(ByteIOContext *s, char *buf, int maxlen);
|
||||
unsigned int get_be16(ByteIOContext *s);
|
||||
unsigned int get_be24(ByteIOContext *s);
|
||||
unsigned int get_be32(ByteIOContext *s);
|
||||
uint64_t get_be64(ByteIOContext *s);
|
||||
|
||||
uint64_t ff_get_v(ByteIOContext *bc);
|
||||
|
||||
static inline int url_is_streamed(ByteIOContext *s)
|
||||
static av_always_inline int64_t avio_tell(AVIOContext *s)
|
||||
{
|
||||
return s->is_streamed;
|
||||
return avio_seek(s, 0, SEEK_CUR);
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates and initializes a ByteIOContext for accessing the
|
||||
* resource referenced by the URLContext h.
|
||||
* @note When the URLContext h has been opened in read+write mode, the
|
||||
* ByteIOContext can be used only for writing.
|
||||
*
|
||||
* @param s Used to return the pointer to the created ByteIOContext.
|
||||
* In case of failure the pointed to value is set to NULL.
|
||||
* @return 0 in case of success, a negative value corresponding to an
|
||||
* AVERROR code in case of failure
|
||||
* Get the filesize.
|
||||
* @return filesize or AVERROR
|
||||
*/
|
||||
int url_fdopen(ByteIOContext **s, URLContext *h);
|
||||
|
||||
/** @warning must be called before any I/O */
|
||||
int url_setbufsize(ByteIOContext *s, int buf_size);
|
||||
#if LIBAVFORMAT_VERSION_MAJOR < 53
|
||||
/** Reset the buffer for reading or writing.
|
||||
* @note Will drop any data currently in the buffer without transmitting it.
|
||||
* @param flags URL_RDONLY to set up the buffer for reading, or URL_WRONLY
|
||||
* to set up the buffer for writing. */
|
||||
int url_resetbuf(ByteIOContext *s, int flags);
|
||||
#endif
|
||||
int64_t avio_size(AVIOContext *s);
|
||||
|
||||
/**
|
||||
* Rewinds the ByteIOContext using the specified buffer containing the first buf_size bytes of the file.
|
||||
* Used after probing to avoid seeking.
|
||||
* Joins buf and s->buffer, taking any overlap into consideration.
|
||||
* @note s->buffer must overlap with buf or they can't be joined and the function fails
|
||||
* @note This function is NOT part of the public API
|
||||
*
|
||||
* @param s The read-only ByteIOContext to rewind
|
||||
* @param buf The probe buffer containing the first buf_size bytes of the file
|
||||
* @param buf_size The size of buf
|
||||
* @return 0 in case of success, a negative value corresponding to an
|
||||
* AVERROR code in case of failure
|
||||
* feof() equivalent for AVIOContext.
|
||||
* @return non zero if and only if end of file
|
||||
*/
|
||||
int ff_rewind_with_probe_data(ByteIOContext *s, unsigned char *buf, int buf_size);
|
||||
int url_feof(AVIOContext *s);
|
||||
|
||||
/** @warning currently size is limited */
|
||||
int avio_printf(AVIOContext *s, const char *fmt, ...) av_printf_format(2, 3);
|
||||
|
||||
/**
|
||||
* Creates and initializes a ByteIOContext for accessing the
|
||||
* Force flushing of buffered data to the output s.
|
||||
*
|
||||
* Force the buffered data to be immediately written to the output,
|
||||
* without to wait to fill the internal buffer.
|
||||
*/
|
||||
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
|
||||
|
||||
/**
|
||||
* Use direct mode.
|
||||
* avio_read and avio_write should if possible be satisfied directly
|
||||
* instead of going through a buffer, and avio_seek will always
|
||||
* call the underlying seek function directly.
|
||||
*/
|
||||
#define AVIO_FLAG_DIRECT 0x8000
|
||||
|
||||
/**
|
||||
* 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 ByteIOContext can be used only for writing.
|
||||
* read+write mode, the AVIOContext can be used only for writing.
|
||||
*
|
||||
* @param s Used to return the pointer to the created ByteIOContext.
|
||||
* @param s Used to return the pointer to the created AVIOContext.
|
||||
* In case of failure the pointed to value is set to NULL.
|
||||
* @param url resource to access
|
||||
* @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
|
||||
* @return >= 0 in case of success, a negative value corresponding to an
|
||||
* AVERROR code in case of failure
|
||||
*/
|
||||
int url_fopen(ByteIOContext **s, const char *url, int flags);
|
||||
|
||||
int url_fclose(ByteIOContext *s);
|
||||
URLContext *url_fileno(ByteIOContext *s);
|
||||
int avio_open(AVIOContext **s, const char *url, int flags);
|
||||
|
||||
/**
|
||||
* Return the maximum packet size associated to packetized buffered file
|
||||
* handle. If the file is not packetized (stream like http or file on
|
||||
* disk), then 0 is returned.
|
||||
* 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 buffered file handle
|
||||
* @return maximum packet size in bytes
|
||||
* @param s Used to return the pointer to the created AVIOContext.
|
||||
* In case of failure the pointed to value is set to NULL.
|
||||
* @param url resource to access
|
||||
* @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 url_fget_max_packet_size(ByteIOContext *s);
|
||||
int avio_open2(AVIOContext **s, const char *url, int flags,
|
||||
const AVIOInterruptCB *int_cb, AVDictionary **options);
|
||||
|
||||
int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags);
|
||||
/**
|
||||
* 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);
|
||||
|
||||
/** return the written or read size */
|
||||
int url_close_buf(ByteIOContext *s);
|
||||
|
||||
/**
|
||||
* Open a write only memory stream.
|
||||
@@ -486,40 +436,61 @@ int url_close_buf(ByteIOContext *s);
|
||||
* @param s new IO context
|
||||
* @return zero if no error.
|
||||
*/
|
||||
int url_open_dyn_buf(ByteIOContext **s);
|
||||
|
||||
/**
|
||||
* Open a write only packetized memory stream with a maximum packet
|
||||
* size of 'max_packet_size'. The stream is stored in a memory buffer
|
||||
* with a big endian 4 byte header giving the packet size in bytes.
|
||||
*
|
||||
* @param s new IO context
|
||||
* @param max_packet_size maximum packet size (must be > 0)
|
||||
* @return zero if no error.
|
||||
*/
|
||||
int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size);
|
||||
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().
|
||||
* 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 url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer);
|
||||
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer);
|
||||
|
||||
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
|
||||
unsigned int len);
|
||||
unsigned long get_checksum(ByteIOContext *s);
|
||||
void init_checksum(ByteIOContext *s,
|
||||
unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
|
||||
unsigned long checksum);
|
||||
/**
|
||||
* 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);
|
||||
|
||||
/* udp.c */
|
||||
int udp_set_remote_url(URLContext *h, const char *uri);
|
||||
int udp_get_local_port(URLContext *h);
|
||||
#if (LIBAVFORMAT_VERSION_MAJOR <= 52)
|
||||
int udp_get_file_handle(URLContext *h);
|
||||
#endif
|
||||
/**
|
||||
* Pause and resume playing - only meaningful if using a network streaming
|
||||
* protocol (e.g. MMS).
|
||||
*
|
||||
* @param h IO context from which to call the read_pause function pointer
|
||||
* @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 h IO context from which to call the seek function pointers
|
||||
* @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.
|
||||
* @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 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 */
|
||||
|
||||
Reference in New Issue
Block a user