#include "avformat.h"
#include "subtitles.h"
#include "avio_internal.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"

Functions
void	ff_text_init_avio (void s, FFTextReader r, AVIOContext *pb)
	Initialize the FFTextReader from the given AVIOContext. More...

void	ff_text_init_buf (FFTextReader r, void buf, size_t size)
	Similar to ff_text_init_avio(), but sets it up to read from a bounded buffer. More...

int64_t	ff_text_pos (FFTextReader *r)
	Return the byte position of the next byte returned by ff_text_r8(). More...

int	ff_text_r8 (FFTextReader *r)
	Return the next byte. More...

void	ff_text_read (FFTextReader r, char buf, size_t size)
	Read the given number of bytes (in UTF-8). More...

int	ff_text_eof (FFTextReader *r)
	Return non-zero if EOF was reached. More...

int	ff_text_peek_r8 (FFTextReader *r)
	Like ff_text_r8(), but don't remove the byte from the buffer. More...

AVPacket *	ff_subtitles_queue_insert (FFDemuxSubtitlesQueue q, const uint8_t event, size_t len, int merge)
	Insert a new subtitle event. More...

static int	cmp_pkt_sub_ts_pos (const void a, const void b)

static int	cmp_pkt_sub_pos_ts (const void a, const void b)

static void	drop_dups (void log_ctx, FFDemuxSubtitlesQueue q)

void	ff_subtitles_queue_finalize (void log_ctx, FFDemuxSubtitlesQueue q)
	Set missing durations, sort subtitles by PTS (and then byte position), and drop duplicated events. More...

int	ff_subtitles_queue_read_packet (FFDemuxSubtitlesQueue q, AVPacket pkt)
	Generic read_packet() callback for subtitles demuxers using this queue system. More...

static int	search_sub_ts (const FFDemuxSubtitlesQueue *q, int64_t ts)

int	ff_subtitles_queue_seek (FFDemuxSubtitlesQueue q, AVFormatContext s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
	Update current_sub_idx to emulate a seek. More...

void	ff_subtitles_queue_clean (FFDemuxSubtitlesQueue *q)
	Remove and destroy all the subtitles packets. More...

int	ff_smil_extract_next_text_chunk (FFTextReader tr, AVBPrint buf, char *c)
	SMIL helper to load next chunk ("<...>" or untagged content) in buf. More...

const char *	ff_smil_get_attr_ptr (const char s, const char attr)
	SMIL helper to point on the value of an attribute in the given tag. More...

static int	is_eol (char c)

void	ff_subtitles_read_text_chunk (FFTextReader tr, AVBPrint buf)
	Read a subtitles chunk from FFTextReader. More...

void	ff_subtitles_read_chunk (AVIOContext pb, AVBPrint buf)
	Same as ff_subtitles_read_text_chunk(), but read from an AVIOContext. More...

ptrdiff_t	ff_subtitles_read_line (FFTextReader tr, char buf, size_t size)
	Read a line of text. More...

Function Documentation

◆ ff_text_init_avio()

void ff_text_init_avio	(	void *	s,
		FFTextReader *	r,
		AVIOContext *	pb
	)

Initialize the FFTextReader from the given AVIOContext.

This function will read some bytes from pb, and test for UTF-8 or UTF-16 BOMs. Further accesses to FFTextReader will read more data from pb. If s is not NULL, the user will be warned if a UTF-16 conversion takes place.

The purpose of FFTextReader is to transparently convert read data to UTF-8 if the stream had a UTF-16 BOM.

Parameters

s	Pointer to provide av_log context
r	object which will be initialized
pb	stream to read from (referenced as long as FFTextReader is in use)

Definition at line 27 of file subtitles.c.

Referenced by ass_read_header(), ff_text_init_buf(), realtext_read_header(), sami_read_header(), scc_read_header(), and srt_read_header().

◆ ff_text_init_buf()

void ff_text_init_buf	(	FFTextReader *	r,
		void *	buf,
		size_t	size
	)

Similar to ff_text_init_avio(), but sets it up to read from a bounded buffer.

Parameters

r	object which will be initialized
buf	buffer to read from (referenced as long as FFTextReader is in use)
size	size of buf

Definition at line 53 of file subtitles.c.

Referenced by ass_probe(), realtext_probe(), sami_probe(), scc_probe(), and srt_probe().

◆ ff_text_pos()

int64_t ff_text_pos ( FFTextReader * r )

Return the byte position of the next byte returned by ff_text_r8().

For UTF-16 source streams, this will return the original position, but it will be incorrect if a codepoint was only partially read with ff_text_r8().

Definition at line 60 of file subtitles.c.

Referenced by get_line(), realtext_read_header(), sami_read_header(), scc_read_header(), and srt_read_header().

◆ ff_text_r8()

int ff_text_r8 ( FFTextReader * r )

Return the next byte.

The return value is always 0 - 255. Returns 0 on EOF. If the source stream is UTF-16, this reads from the stream converted to UTF-8. On invalid UTF-16, 0 is returned.

Definition at line 65 of file subtitles.c.

Referenced by ass_probe(), ff_smil_extract_next_text_chunk(), ff_subtitles_read_line(), ff_subtitles_read_text_chunk(), ff_text_peek_r8(), ff_text_read(), get_line(), scc_probe(), and srt_probe().

◆ ff_text_read()

void ff_text_read	(	FFTextReader *	r,
		char *	buf,
		size_t	size
	)

Read the given number of bytes (in UTF-8).

On error or EOF, \0 bytes are written.

Definition at line 86 of file subtitles.c.

Referenced by ass_probe(), realtext_probe(), sami_probe(), and scc_probe().

◆ ff_text_eof()

int ff_text_eof ( FFTextReader * r )

Return non-zero if EOF was reached.

Definition at line 92 of file subtitles.c.

Referenced by ff_subtitles_read_line(), realtext_read_header(), sami_read_header(), scc_read_header(), and srt_read_header().

◆ ff_text_peek_r8()

int ff_text_peek_r8 ( FFTextReader * r )

Like ff_text_r8(), but don't remove the byte from the buffer.

Definition at line 97 of file subtitles.c.

Referenced by ass_probe(), ff_subtitles_read_line(), scc_probe(), and srt_probe().

◆ ff_subtitles_queue_insert()

AVPacket* ff_subtitles_queue_insert	(	FFDemuxSubtitlesQueue *	q,
		const uint8_t *	event,
		size_t	len,
		int	merge
	)

Insert a new subtitle event.

Parameters

event	the subtitle line, may not be zero terminated
len	the length of the event (in strlen() sense, so without '\0')
merge	set to 1 if the current event should be concatenated with the previous one instead of adding a new entry, 0 otherwise

Definition at line 111 of file subtitles.c.

Referenced by add_event(), aqt_read_header(), ass_read_header(), jacosub_read_header(), lrc_read_header(), microdvd_read_header(), mpl2_read_header(), mpsub_read_header(), parse_file(), pjs_read_header(), realtext_read_header(), sami_read_header(), scc_read_header(), stl_read_header(), subviewer1_read_header(), subviewer_read_header(), vplayer_read_header(), and webvtt_read_header().

◆ cmp_pkt_sub_ts_pos()

static int cmp_pkt_sub_ts_pos	(	const void *	a,
		const void *	b
	)

static

Definition at line 146 of file subtitles.c.

Referenced by ff_subtitles_queue_finalize().

◆ cmp_pkt_sub_pos_ts()

static int cmp_pkt_sub_pos_ts	(	const void *	a,
		const void *	b
	)

static

Definition at line 155 of file subtitles.c.

Referenced by ff_subtitles_queue_finalize().

◆ drop_dups()

static void drop_dups	(	void *	log_ctx,
		FFDemuxSubtitlesQueue *	q
	)

static

Definition at line 167 of file subtitles.c.

Referenced by ff_subtitles_queue_finalize().

◆ ff_subtitles_queue_finalize()

void ff_subtitles_queue_finalize	(	void *	log_ctx,
		FFDemuxSubtitlesQueue *	q
	)

Set missing durations, sort subtitles by PTS (and then byte position), and drop duplicated events.

Definition at line 194 of file subtitles.c.

Referenced by aqt_read_header(), ass_read_header(), jacosub_read_header(), lrc_read_header(), microdvd_read_header(), mpl2_read_header(), mpsub_read_header(), pjs_read_header(), realtext_read_header(), sami_read_header(), scc_read_header(), srt_read_header(), stl_read_header(), subviewer1_read_header(), subviewer_read_header(), tedcaptions_read_header(), vplayer_read_header(), and webvtt_read_header().

◆ ff_subtitles_queue_read_packet()

int ff_subtitles_queue_read_packet	(	FFDemuxSubtitlesQueue *	q,
		AVPacket *	pkt
	)

Generic read_packet() callback for subtitles demuxers using this queue system.

Definition at line 212 of file subtitles.c.

Referenced by aqt_read_packet(), ass_read_packet(), jacosub_read_packet(), lrc_read_packet(), microdvd_read_packet(), mpl2_read_packet(), mpsub_read_packet(), pjs_read_packet(), realtext_read_packet(), sami_read_packet(), scc_read_packet(), srt_read_packet(), stl_read_packet(), subviewer1_read_packet(), subviewer_read_packet(), tedcaptions_read_packet(), vplayer_read_packet(), and webvtt_read_packet().

◆ search_sub_ts()

static int search_sub_ts	(	const FFDemuxSubtitlesQueue *	q,
		int64_t	ts
	)

static

Definition at line 227 of file subtitles.c.

Referenced by ff_subtitles_queue_seek().

◆ ff_subtitles_queue_seek()

int ff_subtitles_queue_seek	(	FFDemuxSubtitlesQueue *	q,
		AVFormatContext *	s,
		int	stream_index,
		int64_t	min_ts,
		int64_t	ts,
		int64_t	max_ts,
		int	flags
	)

Update current_sub_idx to emulate a seek.

Except the first parameter, it matches AVInputFormat->read_seek2 prototypes.

Definition at line 249 of file subtitles.c.

Referenced by aqt_read_seek(), ass_read_seek(), jacosub_read_seek(), lrc_read_seek(), microdvd_read_seek(), mpl2_read_seek(), mpsub_read_seek(), pjs_read_seek(), realtext_read_seek(), sami_read_seek(), scc_read_seek(), srt_read_seek(), stl_read_seek(), subviewer1_read_seek(), subviewer_read_seek(), tedcaptions_read_seek(), vplayer_read_seek(), and webvtt_read_seek().

◆ ff_subtitles_queue_clean()

void ff_subtitles_queue_clean ( FFDemuxSubtitlesQueue * q )

◆ ff_smil_extract_next_text_chunk()

int ff_smil_extract_next_text_chunk	(	FFTextReader *	tr,
		AVBPrint *	buf,
		char *	c
	)

SMIL helper to load next chunk ("<...>" or untagged content) in buf.

Parameters

c	cached character, to avoid a backward seek

Definition at line 311 of file subtitles.c.

Referenced by realtext_read_header(), and sami_read_header().

◆ ff_smil_get_attr_ptr()

const char* ff_smil_get_attr_ptr	(	const char *	s,
		const char *	attr
	)

SMIL helper to point on the value of an attribute in the given tag.

Parameters

s	SMIL tag ("<...>")
attr	the attribute to look for

Definition at line 334 of file subtitles.c.

Referenced by realtext_read_header(), and sami_read_header().

◆ is_eol()

static int is_eol ( char c )

inlinestatic

Definition at line 354 of file subtitles.c.

Referenced by ff_subtitles_read_text_chunk().

◆ ff_subtitles_read_text_chunk()

void ff_subtitles_read_text_chunk	(	FFTextReader *	tr,
		AVBPrint *	buf
	)

Read a subtitles chunk from FFTextReader.

A chunk is defined by a multiline "event", ending with a second line break. The trailing line breaks are trimmed. CRLF are supported. Example: "foo\r\nbar\r\n\r\nnext" will print "foo\r\nbar" into buf, and pb will focus on the 'n' of the "next" string.

Parameters

tr	I/O context
buf	an initialized buf where the chunk is written

Note: buf is cleared before writing into it.

Definition at line 359 of file subtitles.c.

Referenced by ff_subtitles_read_chunk().

◆ ff_subtitles_read_chunk()

void ff_subtitles_read_chunk	(	AVIOContext *	pb,
		AVBPrint *	buf
	)

Same as ff_subtitles_read_text_chunk(), but read from an AVIOContext.

Definition at line 401 of file subtitles.c.

Referenced by mpsub_read_header(), and webvtt_read_header().

◆ ff_subtitles_read_line()

ptrdiff_t ff_subtitles_read_line	(	FFTextReader *	tr,
		char *	buf,
		size_t	size
	)

Read a line of text.

Discards line ending characters. The function handles the following line breaks schemes: LF, CRLF (MS), or standalone CR (old MacOS).

Returns the number of bytes written to buf. Always writes a terminating 0, similar as with snprintf.

Note: returns a negative error code if a \0 byte is found

Definition at line 410 of file subtitles.c.

Referenced by scc_read_header(), srt_probe(), and srt_read_header().

Functions

Function Documentation

◆ ff_text_init_avio()

◆ ff_text_init_buf()

◆ ff_text_pos()

◆ ff_text_r8()

◆ ff_text_read()

◆ ff_text_eof()

◆ ff_text_peek_r8()

◆ ff_subtitles_queue_insert()

◆ cmp_pkt_sub_ts_pos()

◆ cmp_pkt_sub_pos_ts()

◆ drop_dups()

◆ ff_subtitles_queue_finalize()

◆ ff_subtitles_queue_read_packet()

◆ search_sub_ts()

◆ ff_subtitles_queue_seek()

◆ ff_subtitles_queue_clean()

◆ ff_smil_extract_next_text_chunk()

◆ ff_smil_get_attr_ptr()

◆ is_eol()

◆ ff_subtitles_read_text_chunk()

◆ ff_subtitles_read_chunk()

◆ ff_subtitles_read_line()