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119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/*
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* Copyright (c) 2012 Clément Bœsch
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFORMAT_SUBTITLES_H
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#define AVFORMAT_SUBTITLES_H
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#include <stdint.h>
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#include "avformat.h"
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#include "libavutil/bprint.h"
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typedef struct {
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AVPacket *subs; ///< array of subtitles packets
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int nb_subs; ///< number of subtitles packets
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int allocated_size; ///< allocated size for subs
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int current_sub_idx; ///< current position for the read packet callback
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} FFDemuxSubtitlesQueue;
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/**
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* Insert a new subtitle event.
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*
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* @param event the subtitle line, may not be zero terminated
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* @param len the length of the event (in strlen() sense, so without '\0')
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* @param merge set to 1 if the current event should be concatenated with the
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* previous one instead of adding a new entry, 0 otherwise
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*/
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AVPacket *ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q,
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const uint8_t *event, int len, int merge);
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/**
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* Set missing durations and sort subtitles by PTS, and then byte position.
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*/
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void ff_subtitles_queue_finalize(FFDemuxSubtitlesQueue *q);
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/**
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* Generic read_packet() callback for subtitles demuxers using this queue
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* system.
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*/
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int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt);
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/**
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* Update current_sub_idx to emulate a seek. Except the first parameter, it
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* matches AVInputFormat->read_seek2 prototypes.
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*/
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int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int stream_index,
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int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
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/**
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* Remove and destroy all the subtitles packets.
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*/
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void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q);
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/**
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* SMIL helper to load next chunk ("<...>" or untagged content) in buf.
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*
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* @param c cached character, to avoid a backward seek
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*/
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int ff_smil_extract_next_chunk(AVIOContext *pb, AVBPrint *buf, char *c);
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/**
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* SMIL helper to point on the value of an attribute in the given tag.
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*
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* @param s SMIL tag ("<...>")
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* @param attr the attribute to look for
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*/
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const char *ff_smil_get_attr_ptr(const char *s, const char *attr);
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/**
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* @brief Read a subtitles chunk.
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*
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* A chunk is defined by a multiline "event", ending with a second line break.
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* The trailing line breaks are trimmed. CRLF are supported.
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* Example: "foo\r\nbar\r\n\r\nnext" will print "foo\r\nbar" into buf, and pb
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* will focus on the 'n' of the "next" string.
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*
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* @param pb I/O context
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* @param buf an initialized buf where the chunk is written
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*
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* @note buf is cleared before writing into it.
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*/
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void ff_subtitles_read_chunk(AVIOContext *pb, AVBPrint *buf);
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/**
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* Get the number of characters to increment to jump to the next line, or to
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* the end of the string.
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* The function handles the following line breaks schemes:
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* LF, CRLF (MS), or standalone CR (old MacOS).
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*/
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static av_always_inline int ff_subtitles_next_line(const char *ptr)
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{
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int n = strcspn(ptr, "\r\n");
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ptr += n;
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if (*ptr == '\r') {
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ptr++;
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n++;
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}
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if (*ptr == '\n')
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n++;
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return n;
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}
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#endif /* AVFORMAT_SUBTITLES_H */
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