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_indirect (AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
	Read size bytes from AVIOContext, returning a pointer.
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, int64_t 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)
unsigned long	ff_crcA001_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.
int	ffio_open_null_buf (AVIOContext **s)
	Open a write-only fake memory stream.
int	ffio_close_null_buf (AVIOContext *s)
	Close a null buffer.
void	ffio_free_dyn_buf (AVIOContext **s)
	Free a dynamic buffer.

Variables
const AVClass	ff_avio_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 72 of file aviobuf.c.

Referenced by asf_write_header(), asfrtp_parse_packet(), avio_alloc_context(), ff_parse_mpeg2_descriptor(), ff_text_init_buf(), flush_packet(), hls_read_header(), id3v2_parse(), init_MP4DescrParseContext(), init_packetizer(), intercept_id3(), m4sl_cb(), matroska_ebmlnum_uint(), matroska_parse_tracks(), mms_put_utf16(), mov_read_cmov(), qt_rtp_parse_packet(), rdt_load_mdpr(), rdt_parse_packet(), and sap_read_header().

int ffio_read_indirect	(	AVIOContext *	s,
		unsigned char *	buf,
		int	size,
		const unsigned char **	data
	)

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.

Parameters

s	IO context
buf	pointer to buffer into which to assemble the requested data if it is not available in contiguous addresses in the underlying buffer
size	number of bytes requested
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

Returns

number of bytes read or AVERROR

Definition at line 583 of file aviobuf.c.

Referenced by read_packet().

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 595 of file aviobuf.c.

Referenced by ff_raw_read_partial_packet().

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

Definition at line 163 of file aviobuf.c.

Referenced by ff_ape_write_tag(), ff_id3v2_finish(), flac_write_block_padding(), ircam_write_header(), mov_write_tfrf_tag(), mov_write_trailer(), mp3_write_xing(), mxf_write_d10_video_packet(), mxf_write_klv_fill(), put_ebml_size_unknown(), put_ebml_void(), put_xiph_size(), sox_write_header(), and spdif_write_packet().

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

static

Definition at line 67 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(), ff_riff_write_info(), ff_riff_write_info_tag(), ff_start_tag(), 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_colr_tag(), mov_write_ctts_tag(), mov_write_d263_tag(), mov_write_dinf_tag(), mov_write_dpxe_tag(), mov_write_dref_tag(), mov_write_dvc1_tag(), mov_write_eac3_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_gama_tag(), mov_write_glbl_tag(), mov_write_gmhd_tag(), mov_write_hdlr_tag(), mov_write_hmhd_tag(), mov_write_hvcc_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_internal(), mov_write_moov_tag(), mov_write_mvex_tag(), mov_write_mvhd_tag(), mov_write_nmhd_tag(), mov_write_pasp_tag(), mov_write_raw_metadata_tag(), mov_write_rtp_tag(), mov_write_sidx_tag(), mov_write_smhd_tag(), mov_write_source_reference_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_tfdt_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_track_metadata(), mov_write_track_udta_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_write_xing(), ogg_write_page(), oma_write_header(), rv10_write_header(), sox_write_header(), and write_styp().

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 853 of file aviobuf.c.

Referenced by av_probe_input_buffer2(), and ff_img_read_header().

uint64_t ffio_read_varlen

(

AVIOContext *

bc

)

Definition at line 754 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(), mpc8_read_header(), and read_sm_data().

int ffio_set_buf_size	(	AVIOContext *	s,
		int	buf_size
	)

Warning

must be called before any I/O

Definition at line 823 of file aviobuf.c.

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

int ffio_ensure_seekback	(	AVIOContext *	s,
		int64_t	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 guarantee is lost.

Definition at line 797 of file aviobuf.c.

Referenced by apng_read_header(), apng_read_packet(), id3v2_parse(), and mpegts_read_header().

int ffio_limit	(	AVIOContext *	s,
		int	size
	)

Definition at line 177 of file utils.c.

Referenced by append_packet_chunked(), asf_read_stream_properties(), cin_read_packet(), ebml_parse_elem(), 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 514 of file aviobuf.c.

Referenced by get_packetheader(), mp3_parse_vbr_tags(), nut_write_packet(), ogg_write_page(), put_packet(), tak_read_header(), and tta_read_header().

unsigned long ffio_get_checksum

(

AVIOContext *

s

)

Definition at line 506 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(), tak_read_header(), and tta_read_header().

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

Definition at line 494 of file aviobuf.c.

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

unsigned long ff_crcA001_update	(	unsigned long	checksum,
		const uint8_t *	buf,
		unsigned int	len
	)

Definition at line 500 of file aviobuf.c.

Referenced by mp3_parse_vbr_tags().

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 1100 of file aviobuf.c.

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

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 765 of file aviobuf.c.

Referenced by avio_open2(), and ff_rtp_chain_mux_open().

int ffio_open_null_buf

(

AVIOContext **

s

)

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.

Parameters

s	new IO context

Returns

zero if no error.

Definition at line 1155 of file aviobuf.c.

Referenced by get_moov_size(), get_sidx_size(), mov_write_moof_tag(), and mov_write_sidx_tags().

int ffio_close_null_buf

(

AVIOContext *

s

)

Close a null buffer.

Parameters

s	an IO context opened by ffio_open_null_buf

Returns

the number of bytes written to the null buffer

Definition at line 1165 of file aviobuf.c.

Referenced by get_moov_size(), get_sidx_size(), mov_write_moof_tag(), and mov_write_sidx_tags().

void ffio_free_dyn_buf

(

AVIOContext **

s

)

Free a dynamic buffer.

Parameters

s	a pointer to an IO context opened by avio_open_dyn_buf()

Definition at line 1135 of file aviobuf.c.

Referenced by ac3_close_context(), ac3_handle_packet(), asfrtp_close_context(), asfrtp_parse_packet(), decode_str(), dv_close_context(), dv_handle_packet(), ff_mov_close_hinting(), ff_rtp_chain_mux_open(), ff_rtsp_undo_setup(), ffm_write_header_codec_ctx(), h261_close_context(), h261_handle_packet(), h263_close_context(), h263_handle_packet(), jpeg_close_context(), jpeg_parse_packet(), latm_close_context(), latm_parse_packet(), mpa_robust_close_context(), mpa_robust_parse_packet(), mpegts_write_packet_internal(), rtp_mpegts_write_close(), rtp_mpegts_write_header(), set_codec_str(), svq3_close_context(), svq3_parse_packet(), vp8_broken_sequence(), vp8_close_context(), vp8_handle_packet(), vp9_handle_packet(), write_headers(), xiph_close_context(), and xiph_handle_packet().

Variable Documentation

const AVClass ff_avio_class

Definition at line 60 of file aviobuf.c.

Referenced by ffio_fdopen(), and format_child_class_next().