Demuxing Library]

Miscelaneous utility functions related to both muxing and demuxing (or neither). More...

Modules

RIFF FourCCs

Get the tables mapping RIFF FourCCs to libavcodec CodecIDs.

Functions

void av_hex_dump (FILE *f, uint8_t *buf, int size)

Send a nice hexadecimal dump of a buffer to the specified file stream.

void av_hex_dump_log (void *avcl, int level, uint8_t *buf, int size)

Send a nice hexadecimal dump of a buffer to the log.

void av_pkt_dump2 (FILE *f, AVPacket *pkt, int dump_payload, AVStream *st)

Send a nice dump of a packet to the specified file stream.

void av_pkt_dump_log2 (void *avcl, int level, AVPacket *pkt, int dump_payload, AVStream *st)

Send a nice dump of a packet to the log.

enum CodecID av_codec_get_id (const struct AVCodecTag *const *tags, unsigned int tag)

Get the CodecID for the given codec tag tag.

unsigned int av_codec_get_tag (const struct AVCodecTag *const *tags, enum CodecID id)

Get the codec tag for the given codec id id.

int av_find_default_stream_index (AVFormatContext *s)

int av_index_search_timestamp (AVStream *st, int64_t timestamp, int flags)

Get the index for a specific timestamp.

int av_add_index_entry (AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)

Add an index entry into a sorted list.

void av_url_split (char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)

Split a URL string into components.

attribute_deprecated void dump_format (AVFormatContext *ic, int index, const char *url, int is_output)

void av_dump_format (AVFormatContext *ic, int index, const char *url, int is_output)

attribute_deprecated int64_t parse_date (const char *datestr, int duration)

Parse datestr and return a corresponding number of microseconds.

int64_t av_gettime (void)

Get the current time in microseconds.

attribute_deprecated int find_info_tag (char *arg, int arg_size, const char *tag1, const char *info)

int av_get_frame_filename (char *buf, int buf_size, const char *path, int number)

Return in 'buf' the path with 'd' replaced by a number.

int av_filename_number_test (const char *filename)

Check whether filename actually is a numbered sequence generator.

int av_sdp_create (AVFormatContext *ac[], int n_files, char *buf, int size)

Generate an SDP for an RTP session.

attribute_deprecated int avf_sdp_create (AVFormatContext *ac[], int n_files, char *buff, int size)

int av_match_ext (const char *filename, const char *extensions)

Return a positive value if the given filename has one of the given extensions, 0 otherwise.

int avformat_query_codec (AVOutputFormat *ofmt, enum CodecID codec_id, int std_compliance)

Test if the given container can store a codec.

Detailed Description

Miscelaneous utility functions related to both muxing and demuxing (or neither).

Function Documentation

int av_add_index_entry ( AVStream * st,

int64_t pos,

int64_t timestamp,

int size,

int distance,

int flags

)

Add an index entry into a sorted list.

Update the entry if the list already contains it.

Parameters:: timestamp timestamp in the time base of the given stream

Definition at line 1543 of file utils.c.

Referenced by ape_read_header(), asf_build_simple_index(), asf_read_pts(), avi_read_idx1(), avi_sync(), clean_index(), find_and_decode_index(), flv_read_packet(), gxf_read_index(), matroska_add_index_entries(), matroska_parse_block(), mov_read_trun(), mpc8_parse_seektable(), mpc_read_packet(), mpegps_read_pes_header(), mpegts_get_dts(), nsv_parse_NSVs_header(), nut_write_packet(), nuv_read_dts(), parse_keyframes_index(), pmp_header(), pva_read_header(), read_braindead_odml_indx(), read_frame_internal(), read_header(), read_pakt_chunk(), read_part_of_packet(), rl2_read_header(), rm_read_dts(), rm_read_index(), rm_read_packet(), rpl_read_header(), tta_read_header(), wv_read_packet(), and xwma_read_header().

enum CodecID av_codec_get_id ( const struct AVCodecTag *const * tags,

unsigned int tag

)

Get the CodecID for the given codec tag tag.

If no codec id is found returns CODEC_ID_NONE.

Parameters:: tags list of supported codec_id-codec_tag pairs, as stored in AVInputFormat.codec_tag and AVOutputFormat.codec_tag

Referenced by decode_stream_header(), and transcode_init().

unsigned int av_codec_get_tag ( const struct AVCodecTag *const * tags,

enum CodecID id

)

Get the codec tag for the given codec id id.

If no codec tag is found returns 0.

Parameters:: tags list of supported codec_id-codec_tag pairs, as stored in AVInputFormat.codec_tag and AVOutputFormat.codec_tag

Referenced by avformat_query_codec(), avformat_write_header(), and transcode_init().

void av_dump_format ( AVFormatContext * ic,

int index,

const char * url,

int is_output

)

Definition at line 3737 of file utils.c.

Referenced by dump_format(), main(), open_input_file(), opt_input_file(), read_thread(), and transcode_init().

int av_filename_number_test ( const char * filename )

Check whether filename actually is a numbered sequence generator.

Parameters:: filename possible numbered sequence string

Returns:: 1 if a valid numbered sequence string, 0 otherwise

Definition at line 328 of file utils.c.

Referenced by av_guess_format(), avformat_open_input(), opt_output_file(), and read_probe().

int av_find_default_stream_index ( AVFormatContext * s )

Definition at line 1409 of file utils.c.

Referenced by av_seek_frame().

int av_get_frame_filename ( char * buf,

int buf_size,

const char * path,

int number

)

Return in 'buf' the path with 'd' replaced by a number.

Also handles the '0nd' format where 'n' is the total number of digits and '%'.

Parameters:: buf destination buffer

buf_size destination buffer size

path numbered sequence string

number frame number

Returns:: 0 if OK, -1 on format error

Definition at line 3848 of file utils.c.

Referenced by av_filename_number_test(), find_image_range(), read_packet(), seg_write_header(), and segment_start().

int64_t av_gettime ( void )

Get the current time in microseconds.

Definition at line 3816 of file utils.c.

Referenced by applehttp_read(), audio_get_output_timestamp(), audio_read_packet(), bktr_getframe(), enqueue_packet(), fbdev_read_packet(), ff_ntp_time(), ff_rtsp_setup_output_streams(), get_audio_clock(), get_external_clock(), get_video_clock(), get_video_frame(), getutime(), grab_read_header(), grab_read_packet(), http_server(), main(), open_input_stream(), parse_playlist(), process_callback(), rate_emu_sleep(), read_data(), read_packet(), rtsp_read_packet(), sap_write_header(), sap_write_packet(), sdl_audio_callback(), stream_toggle_pause(), transcode(), transcode_init(), update_video_pts(), video_audio_display(), video_refresh(), video_thread(), x11grab_read_header(), and x11grab_read_packet().

void av_hex_dump ( FILE * f,

uint8_t * buf,

int size

)

Send a nice hexadecimal dump of a buffer to the specified file stream.

Parameters:: f The file stream pointer where the dump should be sent to.

buf buffer

size buffer size

See also:: av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2

Definition at line 3932 of file utils.c.

Referenced by pkt_dump_internal().

void av_hex_dump_log ( void * avcl,

int level,

uint8_t * buf,

int size

)

Send a nice hexadecimal dump of a buffer to the log.

Parameters:: avcl A pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct.

level The importance level of the message, lower values signifying higher importance.

buf buffer

size buffer size

See also:: av_hex_dump, av_pkt_dump2, av_pkt_dump_log2

Definition at line 3937 of file utils.c.

Referenced by asf_read_header().

int av_index_search_timestamp ( AVStream * st,

int64_t timestamp,

int flags

)

Get the index for a specific timestamp.

Parameters:: flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to the timestamp which is <= the requested one, if backward is 0, then it will be >= if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise

Returns:: < 0 if no such timestamp could be found

Definition at line 1585 of file utils.c.

Referenced by ape_read_seek(), asf_read_seek(), avi_read_packet(), avi_read_seek(), ff_seek_frame_binary(), gxf_seek(), matroska_read_seek(), mov_seek_stream(), mpc8_read_seek(), mpc_read_seek(), nsv_read_seek(), nut_write_packet(), read_packet(), read_seek(), rl2_read_seek(), seek_frame_generic(), tta_read_seek(), and wv_read_seek().

int av_match_ext ( const char * filename,

const char * extensions

)

Return a positive value if the given filename has one of the given extensions, 0 otherwise.

Parameters:: extensions a comma-separated list of filename extensions

Definition at line 160 of file utils.c.

Referenced by av_guess_format(), av_probe_input_format3(), http_parse_request(), ipod_get_codec_tag(), mpegts_probe(), mpegts_write_header(), and nsv_probe().

void av_pkt_dump2 ( FILE * f,

AVPacket * pkt,

int dump_payload,

AVStream * st

)

Send a nice dump of a packet to the specified file stream.

Parameters:: f The file stream pointer where the dump should be sent to.

pkt packet to dump

dump_payload True if the payload must be displayed, too.

st AVStream that the packet belongs to

Definition at line 3976 of file utils.c.

void av_pkt_dump_log2 ( void * avcl,

int level,

AVPacket * pkt,

int dump_payload,

AVStream * st

)

Send a nice dump of a packet to the log.

Parameters:: avcl A pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct.

level The importance level of the message, lower values signifying higher importance.

pkt packet to dump

dump_payload True if the payload must be displayed, too.

st AVStream that the packet belongs to

Definition at line 3989 of file utils.c.

Referenced by transcode().

int av_sdp_create ( AVFormatContext * ac[],

int n_files,

char * buf,

int size

)

Generate an SDP for an RTP session.

Parameters:: ac array of AVFormatContexts describing the RTP streams. If the array is composed by only one context, such context can contain multiple AVStreams (one AVStream per RTP stream). Otherwise, all the contexts in the array (an AVCodecContext per RTP stream) must contain only one AVStream.

n_files number of AVCodecContexts contained in ac

buf buffer where the SDP will be stored (must be allocated by the caller)

size the size of the buffer

Returns:: 0 if OK, AVERROR_xxx on error

Definition at line 636 of file sdp.c.

Referenced by avf_sdp_create(), ff_rtsp_setup_output_streams(), prepare_sdp_description(), print_sdp(), and sap_write_header().

void av_url_split ( char * proto,

int proto_size,

char * authorization,

int authorization_size,

char * hostname,

int hostname_size,

int * port_ptr,

char * path,

int path_size,

const char * url

)

Split a URL string into components.

The pointers to buffers for storing individual components may be null, in order to ignore that component. Buffers for components not found are set to empty strings. If the port is not found, it is set to a negative value.

Parameters:: proto the buffer for the protocol

proto_size the size of the proto buffer

authorization the buffer for the authorization

authorization_size the size of the authorization buffer

hostname the buffer for the host name

hostname_size the size of the hostname buffer

port_ptr a pointer to store the port number in

path the buffer for the path

path_size the size of the path buffer

url the URL to split

Definition at line 3995 of file utils.c.

Referenced by ff_rtp_set_remote_url(), ff_udp_set_remote_url(), find_rtp_session_with_url(), gopher_open(), http_open_cnx(), mms_open(), mmsh_open_internal(), resetup_tcp(), rtmp_open(), rtp_open(), rtsp_cmd_describe(), rtsp_cmd_setup(), sap_read_header(), sap_write_header(), tcp_open(), tls_open(), and udp_open().

attribute_deprecated int avf_sdp_create ( AVFormatContext * ac[],

int n_files,

char * buff,

int size

)

Definition at line 647 of file sdp.c.

int avformat_query_codec ( AVOutputFormat * ofmt,

enum CodecID codec_id,

int std_compliance

)

Test if the given container can store a codec.

Parameters:: std_compliance standards compliance level, one of FF_COMPLIANCE_*

Returns:: 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot. A negative number if this information is not available.

Definition at line 4327 of file utils.c.

attribute_deprecated void dump_format ( AVFormatContext * ic,

int index,

const char * url,

int is_output

)

Deprecated:: Deprecated in favor of av_dump_format().

Definition at line 3728 of file utils.c.

Referenced by transcode_init().

attribute_deprecated int find_info_tag ( char * arg,

int arg_size,

const char * tag1,

const char * info

)

Deprecated:: use av_find_info_tag in libavutil instead.

Definition at line 3842 of file utils.c.

attribute_deprecated int64_t parse_date ( const char * datestr,

int duration

)

Parse datestr and return a corresponding number of microseconds.

Parameters:: datestr String representing a date or a duration. See av_parse_time() for the syntax of the provided string.

Deprecated:: in favor of av_parse_time()

Definition at line 3831 of file utils.c.

Generated on Fri Oct 26 02:46:15 2012 for FFmpeg by doxygen 1.5.8

Utility functions [I/O and Muxing/Demuxing Library]

Modules

Functions

Detailed Description

Function Documentation

Utility functions
[I/O and Muxing/Demuxing Library]