subtitles.h

/*
 * Copyright (c) 2012 Clément Bœsch
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVFORMAT_SUBTITLES_H
#define AVFORMAT_SUBTITLES_H

#include <stdint.h>
#include <stddef.h>
#include "avformat.h"
#include "libavutil/bprint.h"

enum sub_sort {
    SUB_SORT_TS_POS = 0,    
    SUB_SORT_POS_TS,        
};

enum ff_utf_type {
    FF_UTF_8,       // or other 8 bit encodings
    FF_UTF16LE,
    FF_UTF16BE,
};

typedef struct {
    int type;
    AVIOContext *pb;
    unsigned char buf[8];
    int buf_pos, buf_len;
    AVIOContext buf_pb;
} FFTextReader;

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

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

int64_t ff_text_pos(FFTextReader *r);

int ff_text_r8(FFTextReader *r);

int ff_text_eof(FFTextReader *r);

int ff_text_peek_r8(FFTextReader *r);

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

typedef struct {
    AVPacket *subs;         
    int nb_subs;            
    int allocated_size;     
    int current_sub_idx;    
    enum sub_sort sort;     
    int keep_duplicates;    
} FFDemuxSubtitlesQueue;

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

void ff_subtitles_queue_finalize(void *log_ctx, FFDemuxSubtitlesQueue *q);

int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt);

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);

void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q);

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

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

void ff_subtitles_read_chunk(AVIOContext *pb, AVBPrint *buf);

void ff_subtitles_read_text_chunk(FFTextReader *tr, AVBPrint *buf);

static av_always_inline int ff_subtitles_next_line(const char *ptr)
{
    int n = strcspn(ptr, "\r\n");
    ptr += n;
    if (*ptr == '\r') {
        ptr++;
        n++;
    }
    if (*ptr == '\n')
        n++;
    return n;
}

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

#endif /* AVFORMAT_SUBTITLES_H */