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Data Fields
AVIOContext Struct Reference

Bytestream IO Context. More...

#include <avio.h>

Data Fields

const AVClassav_class
 A class for private options. More...
 
unsigned char * buffer
 Start of the buffer. More...
 
int buffer_size
 Maximum buffer size. More...
 
unsigned char * buf_ptr
 Current position in the buffer. More...
 
unsigned char * buf_end
 End of the data, may be less than buffer+buffer_size if the read function returned less data than requested, e.g. More...
 
voidopaque
 A private pointer, passed to the read/write/seek/... More...
 
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 More...
 
int must_flush
 true if the next seek should flush More...
 
int eof_reached
 true if eof reached More...
 
int write_flag
 true if open for writing More...
 
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 More...
 
int(* read_pause )(void *opaque, int pause)
 Pause or resume playback for network streaming protocols - e.g. More...
 
int64_t(* read_seek )(void *opaque, int stream_index, int64_t timestamp, int flags)
 Seek to a given timestamp in stream with the specified stream_index. More...
 
int seekable
 A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable. More...
 
int64_t maxsize
 max filesize, used to limit allocations This field is internal to libavformat and access from outside is not allowed. More...
 
int direct
 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. More...
 
int64_t bytes_read
 Bytes read statistic This field is internal to libavformat and access from outside is not allowed. More...
 
int seek_count
 seek statistic This field is internal to libavformat and access from outside is not allowed. More...
 
int writeout_count
 writeout statistic This field is internal to libavformat and access from outside is not allowed. More...
 
int orig_buffer_size
 Original buffer size used internally after probing and ensure seekback to reset the buffer size This field is internal to libavformat and access from outside is not allowed. More...
 
int short_seek_threshold
 Threshold to favor readahead over seek. More...
 

Detailed Description

Bytestream IO Context.

New fields can be added to the end with minor version bumps. Removal, reordering and changes to existing fields require a major version bump. sizeof(AVIOContext) must not be used outside libav*.

Note
None of the function pointers in AVIOContext should be called directly, they should only be set by the client application when implementing custom I/O. Normally these are set to the function pointers specified in avio_alloc_context()
Examples:
avio_reading.c, qsvdec.c, and transcode_aac.c.

Definition at line 111 of file avio.h.

Field Documentation

const AVClass* AVIOContext::av_class

A class for private options.

If this AVIOContext is created by avio_open2(), av_class is set and passes the options down to protocols.

If this AVIOContext is manually allocated, then av_class may be set by the caller.

warning – this field can be NULL, be sure to not pass this AVIOContext to any av_opt_* functions in that case.

Definition at line 124 of file avio.h.

Referenced by av_probe_input_buffer2(), and format_child_next().

unsigned char* AVIOContext::buffer
int AVIOContext::buffer_size
unsigned char* AVIOContext::buf_ptr
unsigned char* AVIOContext::buf_end

End of the data, may be less than buffer+buffer_size if the read function returned less data than requested, e.g.

for streams where no more data has been received yet.

Definition at line 128 of file avio.h.

Referenced by avio_r8(), avio_read(), avio_seek(), avio_seek_time(), avio_w8(), avio_write(), ffio_ensure_seekback(), ffio_fill(), ffio_init_context(), ffio_read_indirect(), ffio_read_partial(), ffio_rewind_with_probe_data(), fill_buffer(), flush_buffer(), hls_read_seek(), init_packetizer(), read_gab2_sub(), and url_resetbuf().

void* AVIOContext::opaque
int(* AVIOContext::read_packet)(void *opaque, uint8_t *buf, int buf_size)
int(* AVIOContext::write_packet)(void *opaque, uint8_t *buf, int buf_size)

Definition at line 135 of file avio.h.

Referenced by ffio_init_context(), ffio_open_null_buf(), and writeout().

int64_t(* AVIOContext::seek)(void *opaque, int64_t offset, int whence)

Definition at line 136 of file avio.h.

Referenced by avio_seek(), avio_seek_time(), avio_size(), ffio_init_context(), and nut_read_header().

int64_t AVIOContext::pos
int AVIOContext::must_flush

true if the next seek should flush

Definition at line 138 of file avio.h.

Referenced by avio_flush(), avio_seek(), ffio_init_context(), and ffio_rewind_with_probe_data().

int AVIOContext::eof_reached
int AVIOContext::write_flag
int AVIOContext::max_packet_size
unsigned long AVIOContext::checksum

Definition at line 142 of file avio.h.

Referenced by ffio_get_checksum(), ffio_init_checksum(), fill_buffer(), and flush_buffer().

unsigned char* AVIOContext::checksum_ptr
unsigned long(* AVIOContext::update_checksum)(unsigned long checksum, const uint8_t *buf, unsigned int size)
int AVIOContext::error
int(* AVIOContext::read_pause)(void *opaque, int pause)

Pause or resume playback for network streaming protocols - e.g.

MMS.

Definition at line 149 of file avio.h.

Referenced by avio_pause(), and ffio_init_context().

int64_t(* AVIOContext::read_seek)(void *opaque, int stream_index, int64_t timestamp, int flags)

Seek to a given timestamp in stream with the specified stream_index.

Needed for some network streaming protocols which don't support seeking to byte position.

Definition at line 155 of file avio.h.

Referenced by avio_seek_time(), and ffio_init_context().

int AVIOContext::seekable

A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.

Definition at line 160 of file avio.h.

Referenced by adp_read_header(), adts_aac_read_header(), aiff_read_header(), aiff_write_trailer(), amf_parse_object(), ape_read_header(), apng_write_trailer(), asf_read_data(), asf_read_header(), asf_write_header1(), asf_write_trailer(), ast_write_trailer(), avi_read_header(), avi_write_header(), avi_write_idx1(), avi_write_ix(), avi_write_packet(), avi_write_trailer(), avio_seek(), caf_write_header(), caf_write_trailer(), cine_read_seek(), dsf_read_header(), estimate_timings(), ff_id3v1_read(), ff_voc_get_packet(), ffio_init_context(), ffm2_read_header(), ffm_read_header(), flac_write_trailer(), flv_read_packet(), gxf_write_header(), hls_read_header(), http_prepare_data(), http_receive_data(), ico_write_header(), ivf_write_trailer(), matroska_execute_seekhead(), mkv_start_new_cluster(), mkv_write_flush_packet(), mkv_write_header(), mkv_write_packet(), mkv_write_packet_internal(), mkv_write_trailer(), mov_find_next_sample(), mov_read_cmov(), mov_read_default(), mov_read_header(), mov_read_moof(), mov_write_header(), mp3_read_header(), mp3_write_xing(), mpc8_read_header(), mpc_read_header(), mpegps_read_pes_header(), mv_read_packet(), mv_read_seek(), mxf_parse_handle_essence(), mxf_read_random_index_pack(), mxf_write_footer(), nut_read_header(), ogg_get_length(), ogg_read_page(), ogg_replace_stream(), put_id3v2_tags(), r3d_read_header(), read_header(), read_seek(), rm_read_header(), rm_write_trailer(), rsd_read_header(), rso_write_header(), seek_back(), seg_write_header(), segment_start(), smjpeg_write_trailer(), sox_write_trailer(), swf_write_trailer(), tak_read_header(), tta_read_header(), vc1test_write_trailer(), webm_chunk_write_header(), wv_read_block_header(), wv_read_header(), and wv_write_trailer().

int64_t AVIOContext::maxsize

max filesize, used to limit allocations This field is internal to libavformat and access from outside is not allowed.

Definition at line 166 of file avio.h.

Referenced by append_packet_chunked(), ffio_limit(), mp3_read_header(), and thp_read_header().

int AVIOContext::direct

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.

Definition at line 173 of file avio.h.

Referenced by avio_read(), avio_seek(), avio_write(), and ffio_init_context().

int64_t AVIOContext::bytes_read

Bytes read statistic This field is internal to libavformat and access from outside is not allowed.

Definition at line 179 of file avio.h.

Referenced by avformat_find_stream_info(), avio_close(), avio_read(), and fill_buffer().

int AVIOContext::seek_count

seek statistic This field is internal to libavformat and access from outside is not allowed.

Definition at line 185 of file avio.h.

Referenced by avformat_find_stream_info(), avio_close(), and avio_seek().

int AVIOContext::writeout_count

writeout statistic This field is internal to libavformat and access from outside is not allowed.

Definition at line 191 of file avio.h.

Referenced by avio_close(), and writeout().

int AVIOContext::orig_buffer_size

Original buffer size used internally after probing and ensure seekback to reset the buffer size This field is internal to libavformat and access from outside is not allowed.

Definition at line 198 of file avio.h.

Referenced by ffio_init_context(), ffio_set_buf_size(), and fill_buffer().

int AVIOContext::short_seek_threshold

Threshold to favor readahead over seek.

This is current internal only, do not use from outside.

Definition at line 204 of file avio.h.

Referenced by avio_seek(), ff_configure_buffers_for_index(), and ffio_init_context().


The documentation for this struct was generated from the following file: