mirror of https://git.ffmpeg.org/ffmpeg.git
285 lines
9.3 KiB
C
285 lines
9.3 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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_INTERNAL_H
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#define AVFORMAT_AVIO_INTERNAL_H
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#include "avio.h"
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#include "url.h"
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#include "libavutil/log.h"
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extern const AVClass ff_avio_class;
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typedef struct FFIOContext {
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AVIOContext pub;
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/**
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* A callback that is used instead of short_seek_threshold.
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*/
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int (*short_seek_get)(void *opaque);
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/**
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* Threshold to favor readahead over seek.
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*/
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int short_seek_threshold;
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enum AVIODataMarkerType current_type;
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int64_t last_time;
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/**
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* max filesize, used to limit allocations
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*/
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int64_t maxsize;
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/**
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* Bytes read statistic
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*/
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int64_t bytes_read;
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/**
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* Bytes written statistic
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*/
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int64_t bytes_written;
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/**
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* seek statistic
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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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*/
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int writeout_count;
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/**
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* Original buffer size
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* used after probing to ensure seekback and to reset the buffer size
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*/
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int orig_buffer_size;
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/**
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* Written output size
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* is updated each time a successful writeout ends up further position-wise
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*/
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int64_t written_output_size;
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} FFIOContext;
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static av_always_inline FFIOContext *ffiocontext(AVIOContext *ctx)
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{
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return (FFIOContext*)ctx;
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}
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void ffio_init_context(FFIOContext *s,
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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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/**
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* Read size bytes from AVIOContext, returning a pointer.
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* Note that the data pointed at by the returned pointer is only
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* valid until the next call that references the same IO context.
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* @param s IO context
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* @param buf pointer to buffer into which to assemble the requested
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* data if it is not available in contiguous addresses in the
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* underlying buffer
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* @param size number of bytes requested
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* @param data address at which to store pointer: this will be a
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* a direct pointer into the underlying buffer if the requested
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* number of bytes are available at contiguous addresses, otherwise
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* will be a copy of buf
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* @return number of bytes read or AVERROR
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*/
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int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data);
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void ffio_fill(AVIOContext *s, int b, int64_t count);
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static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
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{
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avio_wl32(pb, MKTAG(s[0], s[1], s[2], s[3]));
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}
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/**
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* Rewind the AVIOContext using the specified buffer containing the first buf_size bytes of the file.
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* Used after probing to avoid seeking.
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* Joins buf and s->buffer, taking any overlap into consideration.
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* @note s->buffer must overlap with buf or they can't be joined and the function fails
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*
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* @param s The read-only AVIOContext to rewind
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* @param buf The probe buffer containing the first buf_size bytes of the file
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* @param buf_size The size of buf
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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 ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **buf, int buf_size);
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uint64_t ffio_read_varlen(AVIOContext *bc);
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/**
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* Read size bytes from AVIOContext into buf.
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* Check that exactly size bytes have been read.
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* @return number of bytes read or AVERROR
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*/
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int ffio_read_size(AVIOContext *s, unsigned char *buf, int size);
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/**
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* Reallocate a given buffer for AVIOContext.
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*
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* @param s the AVIOContext to realloc.
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* @param buf_size required new buffer size.
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* @return 0 on success, a negative AVERROR on failure.
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*/
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int ffio_realloc_buf(AVIOContext *s, int buf_size);
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/**
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* Ensures that the requested seekback buffer size will be available
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*
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* Will ensure that when reading sequentially up to buf_size, seeking
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* within the current pos and pos+buf_size is possible.
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* Once the stream position moves outside this window or another
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* ffio_ensure_seekback call requests a buffer outside this window this
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* guarantee is lost.
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*/
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int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size);
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int ffio_limit(AVIOContext *s, int size);
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void ffio_init_checksum(AVIOContext *s,
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unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
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unsigned long checksum);
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unsigned long ffio_get_checksum(AVIOContext *s);
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unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
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unsigned int len);
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unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
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unsigned int len);
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unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
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unsigned int len);
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/**
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* Open a write only packetized memory stream with a maximum packet
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* size of 'max_packet_size'. The stream is stored in a memory buffer
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* with a big-endian 4 byte header giving the packet size in bytes.
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*
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* @param s new IO context
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* @param max_packet_size maximum packet size (must be > 0)
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* @return zero if no error.
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*/
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int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
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/**
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* Create and initialize a AVIOContext for accessing the
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* resource referenced by the URLContext h.
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* @note When the URLContext h has been opened in read+write mode, the
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* 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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* @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 ffio_fdopen(AVIOContext **s, URLContext *h);
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/**
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* Return the URLContext associated with the AVIOContext
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*
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* @param s IO context
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* @return pointer to URLContext or NULL.
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*/
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URLContext *ffio_geturlcontext(AVIOContext *s);
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/**
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* Read url related dictionary options from the AVIOContext and write to the given dictionary
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*/
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int ffio_copy_url_options(AVIOContext* pb, AVDictionary** avio_opts);
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/**
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* Open a write-only fake memory stream. The written data is not stored
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* anywhere - this is only used for measuring the amount of data
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* written.
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*
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* @param s new IO context
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* @return zero if no error.
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*/
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int ffio_open_null_buf(AVIOContext **s);
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int ffio_open_whitelist(AVIOContext **s, const char *url, int flags,
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const AVIOInterruptCB *int_cb, AVDictionary **options,
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const char *whitelist, const char *blacklist);
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/**
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* Close a null buffer.
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*
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* @param s an IO context opened by ffio_open_null_buf
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* @return the number of bytes written to the null buffer
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*/
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int ffio_close_null_buf(AVIOContext *s);
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/**
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* Reset a dynamic buffer.
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*
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* Resets everything, but keeps the allocated buffer for later use.
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*/
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void ffio_reset_dyn_buf(AVIOContext *s);
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/**
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* Free a dynamic buffer.
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*
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* @param s a pointer to an IO context opened by avio_open_dyn_buf()
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*/
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void ffio_free_dyn_buf(AVIOContext **s);
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struct AVBPrint;
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/**
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* Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting
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* its contents. Stop reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or
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* EOF. The line ending characters are NOT included in the buffer, but they
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* are skipped on the input.
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*
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* @param s the read-only AVIOContext
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* @param bp the AVBPrint buffer
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* @return the length of the read line not including the line endings,
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* negative on error, or if the buffer becomes truncated.
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*/
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int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, struct AVBPrint *bp);
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/**
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* Read a whole null-terminated string of text from AVIOContext to an AVBPrint
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* buffer overwriting its contents. Stop reading after reaching the maximum
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* length, a \\0 or EOF.
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*
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* @param s the read-only AVIOContext
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* @param bp the AVBPrint buffer
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* @param max_len the maximum length to be read from the AVIOContext.
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* Negative (< 0) values signal that there is no known maximum
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* length applicable. A maximum length of zero means that the
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* AVIOContext is not touched, and the function returns
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* with a read length of zero. In all cases the AVBprint
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* is cleared.
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* @return the length of the read string not including the terminating null,
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* negative on error, or if the buffer becomes truncated.
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*/
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int64_t ff_read_string_to_bprint_overwrite(AVIOContext *s, struct AVBPrint *bp,
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int64_t max_len);
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#endif /* AVFORMAT_AVIO_INTERNAL_H */
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