avio_internal.h File Reference

#include "avio.h"
#include "url.h"
#include "libavutil/log.h"

Go to the source code of this file.

Functions
int	ffio_init_context (AVIOContext *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))
int	ffio_read_partial (AVIOContext *s, unsigned char *buf, int size)
	Read size bytes from AVIOContext into buf.
void	ffio_fill (AVIOContext *s, int b, int count)
static av_always_inline void	ffio_wfourcc (AVIOContext *pb, const uint8_t *s)
int	ffio_rewind_with_probe_data (AVIOContext *s, unsigned char **buf, int buf_size)
	Rewind the AVIOContext using the specified buffer containing the first buf_size bytes of the file.
uint64_t	ffio_read_varlen (AVIOContext *bc)
int	ffio_set_buf_size (AVIOContext *s, int buf_size)
int	ffio_ensure_seekback (AVIOContext *s, int buf_size)
	Ensures that the requested seekback buffer size will be available.
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)
int	ffio_open_dyn_packet_buf (AVIOContext **s, int max_packet_size)
	Open a write only packetized memory stream with a maximum packet size of 'max_packet_size'.
int	ffio_fdopen (AVIOContext **s, URLContext *h)
	Create and initialize a AVIOContext for accessing the resource referenced by the URLContext h.

Variables
const AVClass	ffio_url_class

Function Documentation

int ffio_init_context	(	AVIOContext *	s,
		unsigned char *	buffer,
		int	buffer_size,
		int	write_flag,
		void *	opaque,
		int(*)(void *opaque, uint8_t *buf, int buf_size)	read_packet,
		int(*)(void *opaque, uint8_t *buf, int buf_size)	write_packet,
		int64_t(*)(void *opaque, int64_t offset, int whence)	seek
	)

Definition at line 71 of file aviobuf.c.

Referenced by asf_write_header(), asfrtp_parse_packet(), avio_alloc_context(), ff_parse_mpeg2_descriptor(), flush_packet(), hls_read_header(), id3v2_parse(), init_MP4DescrParseContext(), init_packetizer(), m4sl_cb(), matroska_ebmlnum_uint(), matroska_read_header(), mms_put_utf16(), mov_read_cmov(), qt_rtp_parse_packet(), rdt_load_mdpr(), rdt_parse_packet(), and sap_read_header().

int ffio_read_partial	(	AVIOContext *	s,
		unsigned char *	buf,
		int	size
	)

Read size bytes from AVIOContext into buf.

This reads at most 1 packet. If that is not enough fewer bytes will be returned.

Returns

number of bytes read or AVERROR

Definition at line 528 of file aviobuf.c.

Referenced by ff_raw_read_partial_packet().

void ffio_fill	(	AVIOContext *	s,
		int	b,
		int	count
	)

Definition at line 159 of file aviobuf.c.

Referenced by ff_ape_write_tag(), ff_id3v2_finish(), flac_write_block_padding(), ircam_write_header(), mov_write_tfrf_tag(), mp3_write_xing(), sox_write_header(), and spdif_write_packet().

static av_always_inline void ffio_wfourcc ( AVIOContext *  pb, const uint8_t *  s  )

static

Definition at line 50 of file avio_internal.h.

Referenced by aiff_write_header(), ast_write_header(), ast_write_packet(), avi_start_new_riff(), avi_write_header(), avi_write_idx1(), avi_write_ix(), avi_write_trailer(), caf_write_header(), caf_write_trailer(), mov_create_chapter_track(), mov_flush_fragment(), mov_write_3gp_udta_tag(), mov_write_ac3_tag(), mov_write_amr_tag(), mov_write_avcc_tag(), mov_write_avid_tag(), mov_write_chan_tag(), mov_write_chpl_tag(), mov_write_ctts_tag(), mov_write_d263_tag(), mov_write_dinf_tag(), mov_write_dref_tag(), mov_write_dvc1_tag(), mov_write_edts_tag(), mov_write_enda_tag(), mov_write_enda_tag_be(), mov_write_esds_tag(), mov_write_fiel_tag(), mov_write_ftyp_tag(), mov_write_glbl_tag(), mov_write_gmhd_tag(), mov_write_hdlr_tag(), mov_write_hmhd_tag(), mov_write_ilst_tag(), mov_write_int8_metadata(), mov_write_iods_tag(), mov_write_isml_manifest(), mov_write_itunes_hdlr_tag(), mov_write_mdat_tag(), mov_write_mdhd_tag(), mov_write_mdia_tag(), mov_write_meta_tag(), mov_write_mfhd_tag(), mov_write_mfra_tag(), mov_write_minf_tag(), mov_write_moof_tag(), mov_write_moov_tag(), mov_write_mvex_tag(), mov_write_mvhd_tag(), mov_write_nmhd_tag(), mov_write_pasp_tag(), mov_write_rtp_tag(), mov_write_smhd_tag(), mov_write_stbl_tag(), mov_write_stco_tag(), mov_write_string_data_tag(), mov_write_string_tag(), mov_write_stsc_tag(), mov_write_stsd_tag(), mov_write_stss_tag(), mov_write_stsz_tag(), mov_write_stts_tag(), mov_write_tapt_tag(), mov_write_tcmi_tag(), mov_write_tfhd_tag(), mov_write_tfra_tag(), mov_write_tfrf_tag(), mov_write_tfxd_tag(), mov_write_tkhd_tag(), mov_write_tmcd_tag(), mov_write_tmpo_tag(), mov_write_traf_tag(), mov_write_trailer(), mov_write_trak_tag(), mov_write_tref_tag(), mov_write_trex_tag(), mov_write_trkn_tag(), mov_write_trun_tag(), mov_write_udta_sdp(), mov_write_udta_tag(), mov_write_uuid_tag_ipod(), mov_write_uuid_tag_psp(), mov_write_uuidprof_tag(), mov_write_uuidusmt_tag(), mov_write_video_tag(), mov_write_vmhd_tag(), mov_write_wave_tag(), mov_write_wfex_tag(), mp3_update_xing(), mp3_write_xing(), ogg_write_page(), oma_write_header(), rv10_write_header(), and sox_write_header().

int ffio_rewind_with_probe_data	(	AVIOContext *	s,
		unsigned char **	buf,
		int	buf_size
	)

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

Parameters

s	The read-only AVIOContext to rewind
buf	The probe buffer containing the first buf_size bytes of the file
buf_size	The size of buf

Returns

0 in case of success, a negative value corresponding to an AVERROR code in case of failure

Definition at line 782 of file aviobuf.c.

Referenced by av_probe_input_buffer().

uint64_t ffio_read_varlen

(

AVIOContext *

bc

)

Definition at line 685 of file aviobuf.c.

Referenced by decode_frame_header(), decode_info_header(), decode_main_header(), decode_stream_header(), decode_syncpoint(), find_and_decode_index(), get_fourcc(), get_packetheader(), get_s(), get_str(), mpc8_get_chunk_header(), mpc8_handle_chunk(), and mpc8_read_header().

int ffio_set_buf_size	(	AVIOContext *	s,
		int	buf_size
	)

Warning

must be called before any I/O

Definition at line 753 of file aviobuf.c.

Referenced by build_feed_streams(), ffm_read_data(), fill_buffer(), and open_input_stream().

int ffio_ensure_seekback	(	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 this gurantee is lost.

Definition at line 728 of file aviobuf.c.

Referenced by mpegts_read_header().

int ffio_limit	(	AVIOContext *	s,
		int	size
	)

Definition at line 109 of file utils.c.

Referenced by append_packet_chunked(), asf_read_stream_properties(), cin_read_packet(), ebml_parse_elem(), film_read_packet(), rm_assemble_video_frame(), roq_read_packet(), siff_read_packet(), and vmd_read_packet().

void ffio_init_checksum	(	AVIOContext *	s,
		unsigned long(*)(unsigned long c, const uint8_t *p, unsigned int len)	update_checksum,
		unsigned long	checksum
	)

Definition at line 459 of file aviobuf.c.

Referenced by get_packetheader(), nut_write_packet(), ogg_write_page(), put_packet(), and tta_read_header().

unsigned long ffio_get_checksum

(

AVIOContext *

s

)

Definition at line 451 of file aviobuf.c.

Referenced by decode_info_header(), decode_main_header(), decode_stream_header(), decode_syncpoint(), find_and_decode_index(), get_packetheader(), nut_write_packet(), ogg_update_checksum(), put_packet(), and tta_read_header().

unsigned long ff_crc04C11DB7_update	(	unsigned long	checksum,
		const uint8_t *	buf,
		unsigned int	len
	)

Definition at line 445 of file aviobuf.c.

Referenced by get_packetheader(), nut_write_packet(), ogg_write_page(), and put_packet().

int ffio_open_dyn_packet_buf	(	AVIOContext **	s,
		int	max_packet_size
	)

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.

Parameters

s	new IO context
max_packet_size	maximum packet size (must be > 0)

Returns

zero if no error.

Definition at line 1008 of file aviobuf.c.

Referenced by ff_mov_add_hinted_packet(), ff_rtp_chain_mux_open(), http_prepare_data(), rtp_new_av_stream(), and tcp_write_packet().

int ffio_fdopen	(	AVIOContext **	s,
		URLContext *	h
	)

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.

Parameters

s	Used to return the pointer to the created AVIOContext. In case of failure the pointed to value is set to NULL.

Returns

0 in case of success, a negative value corresponding to an AVERROR code in case of failure

Definition at line 696 of file aviobuf.c.

Referenced by avio_open2(), and ff_rtp_chain_mux_open().

Variable Documentation

const AVClass ffio_url_class

Definition at line 59 of file aviobuf.c.

Referenced by ffio_fdopen(), and format_child_class_next().