mirror of https://git.ffmpeg.org/ffmpeg.git
318 lines
10 KiB
C
318 lines
10 KiB
C
/*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVFORMAT_AVIO_INTERNAL_H
|
|
#define AVFORMAT_AVIO_INTERNAL_H
|
|
|
|
#include "avio.h"
|
|
|
|
#include "libavutil/log.h"
|
|
|
|
extern const AVClass ff_avio_class;
|
|
|
|
typedef struct FFIOContext {
|
|
AVIOContext pub;
|
|
/**
|
|
* A callback that is used instead of short_seek_threshold.
|
|
*/
|
|
int (*short_seek_get)(void *opaque);
|
|
|
|
/**
|
|
* Threshold to favor readahead over seek.
|
|
*/
|
|
int short_seek_threshold;
|
|
|
|
enum AVIODataMarkerType current_type;
|
|
int64_t last_time;
|
|
|
|
/**
|
|
* max filesize, used to limit allocations
|
|
*/
|
|
int64_t maxsize;
|
|
|
|
/**
|
|
* Bytes read statistic
|
|
*/
|
|
int64_t bytes_read;
|
|
|
|
/**
|
|
* Bytes written statistic
|
|
*/
|
|
int64_t bytes_written;
|
|
|
|
/**
|
|
* seek statistic
|
|
*/
|
|
int seek_count;
|
|
|
|
/**
|
|
* writeout statistic
|
|
*/
|
|
int writeout_count;
|
|
|
|
/**
|
|
* Original buffer size
|
|
* used after probing to ensure seekback and to reset the buffer size
|
|
*/
|
|
int orig_buffer_size;
|
|
|
|
/**
|
|
* Written output size
|
|
* is updated each time a successful writeout ends up further position-wise
|
|
*/
|
|
int64_t written_output_size;
|
|
} FFIOContext;
|
|
|
|
static av_always_inline FFIOContext *ffiocontext(AVIOContext *ctx)
|
|
{
|
|
return (FFIOContext*)ctx;
|
|
}
|
|
|
|
void ffio_init_context(FFIOContext *s,
|
|
unsigned char *buffer,
|
|
int buffer_size,
|
|
int write_flag,
|
|
void *opaque,
|
|
int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
|
|
#if FF_API_AVIO_WRITE_NONCONST
|
|
int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
|
|
#else
|
|
int (*write_packet)(void *opaque, const uint8_t *buf, int buf_size),
|
|
#endif
|
|
int64_t (*seek)(void *opaque, int64_t offset, int whence));
|
|
|
|
/**
|
|
* Wrap a buffer in an AVIOContext for reading.
|
|
*/
|
|
void ffio_init_read_context(FFIOContext *s, const uint8_t *buffer, int buffer_size);
|
|
|
|
/**
|
|
* Wrap a buffer in an AVIOContext for writing.
|
|
*/
|
|
void ffio_init_write_context(FFIOContext *s, uint8_t *buffer, int buffer_size);
|
|
|
|
/**
|
|
* Read size bytes from AVIOContext, returning a pointer.
|
|
* Note that the data pointed at by the returned pointer is only
|
|
* valid until the next call that references the same IO context.
|
|
* @param s IO context
|
|
* @param buf pointer to buffer into which to assemble the requested
|
|
* data if it is not available in contiguous addresses in the
|
|
* underlying buffer
|
|
* @param size number of bytes requested
|
|
* @param data address at which to store pointer: this will be a
|
|
* a direct pointer into the underlying buffer if the requested
|
|
* number of bytes are available at contiguous addresses, otherwise
|
|
* will be a copy of buf
|
|
* @return number of bytes read or AVERROR
|
|
*/
|
|
int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data);
|
|
|
|
void ffio_fill(AVIOContext *s, int b, int64_t count);
|
|
|
|
static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
|
|
{
|
|
avio_wl32(pb, MKTAG(s[0], s[1], s[2], s[3]));
|
|
}
|
|
|
|
/**
|
|
* Rewind the AVIOContext 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
|
|
*
|
|
* @param s The read-only AVIOContext 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
|
|
*/
|
|
int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **buf, int buf_size);
|
|
|
|
uint64_t ffio_read_varlen(AVIOContext *bc);
|
|
|
|
/**
|
|
* Read a unsigned integer coded as a variable number of up to eight
|
|
* little-endian bytes, where the MSB in a byte signals another byte
|
|
* must be read.
|
|
* All coded bytes are read, but values > UINT_MAX are truncated.
|
|
*/
|
|
unsigned int ffio_read_leb(AVIOContext *s);
|
|
|
|
void ffio_write_leb(AVIOContext *s, unsigned val);
|
|
|
|
/**
|
|
* Write a sequence of text lines, converting line endings.
|
|
* All input line endings (LF, CRLF, CR) are converted to the configured line ending.
|
|
* @param s The AVIOContext to write to
|
|
* @param buf The buffer to write
|
|
* @param size The size of the buffer, or <0 to use the full length of a null-terminated string
|
|
* @param ending The line ending sequence to convert to, or NULL for \n
|
|
*/
|
|
void ffio_write_lines(AVIOContext *s, const unsigned char *buf, int size,
|
|
const unsigned char *ending);
|
|
|
|
/**
|
|
* Read size bytes from AVIOContext into buf.
|
|
* Check that exactly size bytes have been read.
|
|
* @return number of bytes read or AVERROR
|
|
*/
|
|
int ffio_read_size(AVIOContext *s, unsigned char *buf, int size);
|
|
|
|
/**
|
|
* Reallocate a given buffer for AVIOContext.
|
|
*
|
|
* @param s the AVIOContext to realloc.
|
|
* @param buf_size required new buffer size.
|
|
* @return 0 on success, a negative AVERROR on failure.
|
|
*/
|
|
int ffio_realloc_buf(AVIOContext *s, int buf_size);
|
|
|
|
/**
|
|
* Ensures that the requested seekback buffer size will be available
|
|
*
|
|
* Will ensure that when reading sequentially up to buf_size, seeking
|
|
* within the current pos and pos+buf_size is possible.
|
|
* Once the stream position moves outside this window or another
|
|
* ffio_ensure_seekback call requests a buffer outside this window this
|
|
* guarantee is lost.
|
|
*/
|
|
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size);
|
|
|
|
int ffio_limit(AVIOContext *s, int size);
|
|
|
|
void ffio_init_checksum(AVIOContext *s,
|
|
unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
|
|
unsigned long checksum);
|
|
unsigned long ffio_get_checksum(AVIOContext *s);
|
|
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
|
|
unsigned int len);
|
|
unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
|
|
unsigned int len);
|
|
unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
|
|
unsigned int len);
|
|
|
|
/**
|
|
* 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 ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
|
|
|
|
/**
|
|
* Return the URLContext associated with the AVIOContext
|
|
*
|
|
* @param s IO context
|
|
* @return pointer to URLContext or NULL.
|
|
*/
|
|
struct URLContext *ffio_geturlcontext(AVIOContext *s);
|
|
|
|
/**
|
|
* Create and initialize a AVIOContext for accessing the
|
|
* resource referenced by the URLContext h.
|
|
* @note When the URLContext h has been opened in read+write mode, the
|
|
* AVIOContext can be used only for writing.
|
|
*
|
|
* @param s Used to return the pointer to the created AVIOContext.
|
|
* In case of failure the pointed to value is set to NULL.
|
|
* @return >= 0 in case of success, a negative value corresponding to an
|
|
* AVERROR code in case of failure
|
|
*/
|
|
int ffio_fdopen(AVIOContext **s, struct URLContext *h);
|
|
|
|
|
|
/**
|
|
* Read url related dictionary options from the AVIOContext and write to the given dictionary
|
|
*/
|
|
int ffio_copy_url_options(AVIOContext* pb, AVDictionary** avio_opts);
|
|
|
|
/**
|
|
* Open a write-only fake memory stream. The written data is not stored
|
|
* anywhere - this is only used for measuring the amount of data
|
|
* written.
|
|
*
|
|
* @param s new IO context
|
|
* @return zero if no error.
|
|
*/
|
|
int ffio_open_null_buf(AVIOContext **s);
|
|
|
|
int ffio_open_whitelist(AVIOContext **s, const char *url, int flags,
|
|
const AVIOInterruptCB *int_cb, AVDictionary **options,
|
|
const char *whitelist, const char *blacklist);
|
|
|
|
/**
|
|
* Close a null buffer.
|
|
*
|
|
* @param s an IO context opened by ffio_open_null_buf
|
|
* @return the number of bytes written to the null buffer
|
|
*/
|
|
int ffio_close_null_buf(AVIOContext *s);
|
|
|
|
/**
|
|
* Reset a dynamic buffer.
|
|
*
|
|
* Resets everything, but keeps the allocated buffer for later use.
|
|
*/
|
|
void ffio_reset_dyn_buf(AVIOContext *s);
|
|
|
|
/**
|
|
* Free a dynamic buffer.
|
|
*
|
|
* @param s a pointer to an IO context opened by avio_open_dyn_buf()
|
|
*/
|
|
void ffio_free_dyn_buf(AVIOContext **s);
|
|
|
|
struct AVBPrint;
|
|
/**
|
|
* Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting
|
|
* its contents. Stop reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or
|
|
* EOF. The line ending characters are NOT included in the buffer, but they
|
|
* are skipped on the input.
|
|
*
|
|
* @param s the read-only AVIOContext
|
|
* @param bp the AVBPrint buffer
|
|
* @return the length of the read line not including the line endings,
|
|
* negative on error, or if the buffer becomes truncated.
|
|
*/
|
|
int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, struct AVBPrint *bp);
|
|
|
|
/**
|
|
* Read a whole null-terminated string of text from AVIOContext to an AVBPrint
|
|
* buffer overwriting its contents. Stop reading after reaching the maximum
|
|
* length, a \\0 or EOF.
|
|
*
|
|
* @param s the read-only AVIOContext
|
|
* @param bp the AVBPrint buffer
|
|
* @param max_len the maximum length to be read from the AVIOContext.
|
|
* Negative (< 0) values signal that there is no known maximum
|
|
* length applicable. A maximum length of zero means that the
|
|
* AVIOContext is not touched, and the function returns
|
|
* with a read length of zero. In all cases the AVBprint
|
|
* is cleared.
|
|
* @return the length of the read string not including the terminating null,
|
|
* negative on error, or if the buffer becomes truncated.
|
|
*/
|
|
int64_t ff_read_string_to_bprint_overwrite(AVIOContext *s, struct AVBPrint *bp,
|
|
int64_t max_len);
|
|
|
|
#endif /* AVFORMAT_AVIO_INTERNAL_H */
|