Core functions

Functions for querying libavformat capabilities, allocating core structures, etc. More...

Collaboration diagram for Core functions:

Functions
unsigned	avformat_version (void)
	Return the LIBAVFORMAT_VERSION_INT constant. More...
const char *	avformat_configuration (void)
	Return the libavformat build-time configuration. More...
const char *	avformat_license (void)
	Return the libavformat license. More...
void	av_register_all (void)
	Initialize libavformat and register all the muxers, demuxers and protocols. More...
void	av_register_input_format (AVInputFormat *format)
void	av_register_output_format (AVOutputFormat *format)
int	avformat_network_init (void)
	Do global initialization of network components. More...
int	avformat_network_deinit (void)
	Undo the initialization done by avformat_network_init. More...
AVInputFormat *	av_iformat_next (AVInputFormat *f)
	If f is NULL, returns the first registered input format, if f is non-NULL, returns the next registered input format after f or NULL if f is the last one. More...
AVOutputFormat *	av_oformat_next (AVOutputFormat *f)
	If f is NULL, returns the first registered output format, if f is non-NULL, returns the next registered output format after f or NULL if f is the last one. More...
AVFormatContext *	avformat_alloc_context (void)
	Allocate an AVFormatContext. More...
void	avformat_free_context (AVFormatContext *s)
	Free an AVFormatContext and all its streams. More...
const AVClass *	avformat_get_class (void)
	Get the AVClass for AVFormatContext. More...
AVStream *	avformat_new_stream (AVFormatContext *s, const AVCodec *c)
	Add a new stream to a media file. More...
AVProgram *	av_new_program (AVFormatContext *s, int id)

Detailed Description

Functions for querying libavformat capabilities, allocating core structures, etc.

Function Documentation

AVInputFormat* av_iformat_next

(

AVInputFormat *

f

)

If f is NULL, returns the first registered input format, if f is non-NULL, returns the next registered input format after f or NULL if f is the last one.

Definition at line 113 of file libavformat/utils.c.

Referenced by av_find_input_format(), av_probe_input_format3(), format_child_class_next(), probe(), show_format_opts(), and show_formats().

AVProgram* av_new_program	(	AVFormatContext *	s,
		int	id
	)

Definition at line 3421 of file libavformat/utils.c.

Referenced by hls_read_header(), pat_cb(), and sdt_cb().

AVOutputFormat* av_oformat_next

(

AVOutputFormat *

f

)

If f is NULL, returns the first registered output format, if f is non-NULL, returns the next registered output format after f or NULL if f is the last one.

Definition at line 119 of file libavformat/utils.c.

Referenced by av_guess_format(), format_child_class_next(), show_format_opts(), and show_formats().

void av_register_all

(

void

)

Initialize libavformat and register all the muxers, demuxers and protocols.

If you do not call this function, then you can select exactly which formats you want to support.

See also

av_register_input_format()

av_register_output_format()

Definition at line 52 of file allformats.c.

Referenced by ff_load_image(), main(), and movie_common_init().

void av_register_input_format

(

AVInputFormat *

format

)

Definition at line 125 of file libavformat/utils.c.

void av_register_output_format

(

AVOutputFormat *

format

)

Definition at line 134 of file libavformat/utils.c.

AVFormatContext* avformat_alloc_context

(

void

)

Allocate an AVFormatContext.

avformat_free_context() can be used to free the context and everything allocated by the framework within it.

Definition at line 106 of file libavformat/options.c.

Referenced by avformat_alloc_output_context2(), avformat_open_input(), ff_mov_read_stsd_entries(), ff_rtp_chain_mux_open(), ff_wms_parse_sdp_a_line(), hls_mux_init(), hls_read_header(), http_receive_data(), ism_write_header(), mpegts_write_header(), open_input_file(), prepare_sdp_description(), read_ffserver_streams(), read_gab2_sub(), read_thread(), rtp_new_av_stream(), sap_read_header(), and segment_mux_init().

const char* avformat_configuration

(

void

)

Return the libavformat build-time configuration.

Definition at line 64 of file libavformat/utils.c.

void avformat_free_context

(

AVFormatContext *

s

)

Free an AVFormatContext and all its streams.

Parameters

s	context to free

Definition at line 3291 of file libavformat/utils.c.

Referenced by avformat_alloc_output_context2(), avformat_close_input(), avformat_open_input(), close_slaves(), exit_program(), ff_mov_close_hinting(), ff_rtp_chain_mux_open(), ff_rtsp_undo_setup(), hls_read_header(), hls_write_header(), hls_write_trailer(), ism_free(), main(), mpegts_write_end(), mpegts_write_header(), sap_write_close(), seg_write_header(), seg_write_packet(), seg_write_trailer(), and segment_start().

const AVClass* avformat_get_class

(

void

)

Get the AVClass for AVFormatContext.

It can be used in combination with AV_OPT_SEARCH_FAKE_OBJ for examining options.

See also

av_opt_find().

Definition at line 120 of file libavformat/options.c.

Referenced by opt_default(), show_format_opts(), and show_help_default().

const char* avformat_license

(

void

)

Return the libavformat license.

Definition at line 69 of file libavformat/utils.c.

int avformat_network_deinit

(

void

)

Undo the initialization done by avformat_network_init.

Definition at line 4208 of file libavformat/utils.c.

Referenced by do_exit(), exit_program(), main(), and term_init().

int avformat_network_init

(

void

)

Do global initialization of network components.

This is optional, but recommended, since it avoids the overhead of implicitly doing the setup for each session.

Calling this function will become mandatory if using network protocols at some major version bump.

Definition at line 4196 of file libavformat/utils.c.

Referenced by main().

AVStream* avformat_new_stream	(	AVFormatContext *	s,
		const AVCodec *	c
	)

Add a new stream to a media file.

When demuxing, it is called by the demuxer in read_header(). If the flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also be called in read_packet().

When muxing, should be called by the user before avformat_write_header().

Parameters

c	If non-NULL, the AVCodecContext corresponding to the new stream will be initialized to use this codec. This is needed for e.g. codec-specific defaults to be set, so codec should be provided if it is known.

Returns

newly created stream or NULL on error.

Definition at line 3362 of file libavformat/utils.c.

Referenced by add_dstream(), add_stream(), adts_aac_read_header(), adx_read_header(), aea_read_header(), afc_read_header(), aiff_read_header(), amr_read_header(), apc_read_header(), ape_read_header(), ape_tag_read_field(), aqt_read_header(), asf_read_picture(), asf_read_stream_properties(), ass_read_header(), ast_read_header(), audio_read_header(), avformat_close_input(), avi_read_header(), avisynth_create_stream(), avpriv_dv_init_demux(), avr_read_header(), avs_read_packet(), bfi_read_header(), bmv_read_header(), cdata_read_header(), cdxl_read_packet(), cin_read_header(), concat_read_header(), create_audio_stream(), create_new_audio_stream(), create_stream(), daud_header(), dc1394_read_common(), decode_main_header(), dfa_read_header(), dshow_add_device(), dtshd_read_header(), dv_extract_audio_info(), dxa_read_header(), ea_read_header(), epaf_read_header(), fbdev_read_header(), ff_id3v2_parse_apic(), ff_raw_audio_read_header(), ff_raw_video_read_header(), ff_rtp_chain_mux_open(), ff_spdif_read_packet(), ffm2_read_header(), ffm_read_header(), film_read_header(), flac_read_header(), flic_read_header(), fourxm_read_header(), frm_read_header(), g722_read_header(), g723_1_init(), g729_read_header(), get_attachment(), get_sindex(), get_sockaddr(), gif_read_header(), grab_read_header(), gsm_read_header(), hls_mux_init(), hls_read_header(), idcin_read_header(), iec61883_read_header(), iff_read_header(), ilbc_read_header(), img_read_header(), init_stream(), ipmovie_read_header(), ircam_read_header(), ism_write_header(), iss_read_header(), jacosub_read_header(), lavfi_read_header(), libquvi_read_header(), lmlm4_read_header(), loas_read_header(), lvf_read_header(), lxf_read_header(), matroska_read_header(), microdvd_read_header(), mmf_read_header(), modplug_read_header(), mov_read_covr(), mov_read_trak(), mp3_read_header(), mpc8_read_header(), mpc_read_header(), mpegps_read_packet(), mpegts_push_data(), mpegts_read_header(), mpegts_set_stream_info(), mpegts_write_header(), mpl2_read_header(), mpsub_read_header(), msnwc_tcp_read_header(), mtv_read_header(), mv_read_header(), mxf_parse_structural_metadata(), mxg_read_header(), nc_read_header(), new_output_stream(), new_stream(), nist_read_header(), nsv_parse_NSVs_header(), nut_read_header(), nuv_header(), ogg_new_stream(), oma_read_header(), open_slave(), parse_picture(), pcm_read_header(), pjs_read_header(), pmp_header(), pmt_cb(), pulse_read_header(), pva_read_header(), pvf_read_header(), qcp_read_header(), r3d_read_red1(), rawvideo_read_header(), read_desc_chunk(), read_frame(), read_header(), read_packet(), realtext_read_header(), rl2_read_header(), rm_read_header(), rm_read_header_old(), roq_read_packet(), rpl_read_header(), rso_read_header(), sami_read_header(), sap_fetch_packet(), sap_read_header(), sbg_read_header(), segment_mux_init(), seq_read_header(), siff_parse_vbv1(), smacker_read_header(), smjpeg_read_header(), smush_read_header(), sol_read_header(), sox_read_header(), srt_read_header(), str_read_packet(), subviewer1_read_header(), subviewer_read_header(), swf_read_packet(), tak_read_header(), tedcaptions_read_header(), thp_read_header(), tmv_read_header(), tta_read_header(), txd_read_header(), v4l2_read_header(), vc1t_read_header(), vfw_read_header(), vid_read_packet(), vivo_read_header(), vmd_read_header(), voc_read_header(), vplayer_read_header(), vqf_read_header(), wc3_read_header(), webvtt_read_header(), wsaud_read_header(), wsvqa_read_header(), wsvqa_read_packet(), wv_read_header(), x11grab_read_header(), xa_read_header(), xmv_read_header(), xwma_read_header(), yop_read_header(), and yuv4_read_header().

unsigned avformat_version

(

void

)

Return the LIBAVFORMAT_VERSION_INT constant.

Definition at line 58 of file libavformat/utils.c.