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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2012 Clément Bœsch |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #ifndef AVFORMAT_SUBTITLES_H |
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| 22 | #define AVFORMAT_SUBTITLES_H |
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| 23 | |||
| 24 | #include |
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| 25 | #include "avformat.h" |
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| 26 | #include "libavutil/bprint.h" |
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| 27 | |||
| 28 | enum sub_sort { |
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| 29 | SUB_SORT_TS_POS = 0, ///< sort by timestamps, then position |
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| 30 | SUB_SORT_POS_TS, ///< sort by position, then timestamps |
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| 31 | }; |
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| 32 | |||
| 33 | typedef struct { |
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| 34 | AVPacket *subs; ///< array of subtitles packets |
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| 35 | int nb_subs; ///< number of subtitles packets |
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| 36 | int allocated_size; ///< allocated size for subs |
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| 37 | int current_sub_idx; ///< current position for the read packet callback |
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| 38 | enum sub_sort sort; ///< sort method to use when finalizing subtitles |
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| 39 | } FFDemuxSubtitlesQueue; |
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| 40 | |||
| 41 | /** |
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| 42 | * Insert a new subtitle event. |
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| 43 | * |
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| 44 | * @param event the subtitle line, may not be zero terminated |
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| 45 | * @param len the length of the event (in strlen() sense, so without '\0') |
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| 46 | * @param merge set to 1 if the current event should be concatenated with the |
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| 47 | * previous one instead of adding a new entry, 0 otherwise |
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| 48 | */ |
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| 49 | AVPacket *ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q, |
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| 50 | const uint8_t *event, int len, int merge); |
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| 51 | |||
| 52 | /** |
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| 53 | * Set missing durations and sort subtitles by PTS, and then byte position. |
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| 54 | */ |
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| 55 | void ff_subtitles_queue_finalize(FFDemuxSubtitlesQueue *q); |
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| 56 | |||
| 57 | /** |
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| 58 | * Generic read_packet() callback for subtitles demuxers using this queue |
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| 59 | * system. |
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| 60 | */ |
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| 61 | int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt); |
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| 62 | |||
| 63 | /** |
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| 64 | * Update current_sub_idx to emulate a seek. Except the first parameter, it |
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| 65 | * matches AVInputFormat->read_seek2 prototypes. |
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| 66 | */ |
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| 67 | int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int stream_index, |
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| 68 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags); |
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| 69 | |||
| 70 | /** |
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| 71 | * Remove and destroy all the subtitles packets. |
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| 72 | */ |
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| 73 | void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q); |
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| 74 | |||
| 75 | /** |
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| 76 | * SMIL helper to load next chunk ("<...>" or untagged content) in buf. |
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| 77 | * |
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| 78 | * @param c cached character, to avoid a backward seek |
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| 79 | */ |
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| 80 | int ff_smil_extract_next_chunk(AVIOContext *pb, AVBPrint *buf, char *c); |
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| 81 | |||
| 82 | /** |
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| 83 | * SMIL helper to point on the value of an attribute in the given tag. |
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| 84 | * |
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| 85 | * @param s SMIL tag ("<...>") |
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| 86 | * @param attr the attribute to look for |
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| 87 | */ |
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| 88 | const char *ff_smil_get_attr_ptr(const char *s, const char *attr); |
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| 89 | |||
| 90 | /** |
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| 91 | * @brief Read a subtitles chunk. |
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| 92 | * |
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| 93 | * A chunk is defined by a multiline "event", ending with a second line break. |
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| 94 | * The trailing line breaks are trimmed. CRLF are supported. |
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| 95 | * Example: "foo\r\nbar\r\n\r\nnext" will print "foo\r\nbar" into buf, and pb |
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| 96 | * will focus on the 'n' of the "next" string. |
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| 97 | * |
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| 98 | * @param pb I/O context |
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| 99 | * @param buf an initialized buf where the chunk is written |
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| 100 | * |
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| 101 | * @note buf is cleared before writing into it. |
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| 102 | */ |
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| 103 | void ff_subtitles_read_chunk(AVIOContext *pb, AVBPrint *buf); |
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| 104 | |||
| 105 | /** |
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| 106 | * Get the number of characters to increment to jump to the next line, or to |
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| 107 | * the end of the string. |
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| 108 | * The function handles the following line breaks schemes: |
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| 109 | * LF, CRLF (MS), or standalone CR (old MacOS). |
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| 110 | */ |
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| 111 | static av_always_inline int ff_subtitles_next_line(const char *ptr) |
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| 112 | { |
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| 113 | int n = strcspn(ptr, "\r\n"); |
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| 114 | ptr += n; |
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| 115 | if (*ptr == '\r') { |
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| 116 | ptr++; |
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| 117 | n++; |
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| 118 | } |
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| 119 | if (*ptr == '\n') |
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| 120 | n++; |
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| 121 | return n; |
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| 122 | } |
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| 123 | |||
| 124 | #endif /* AVFORMAT_SUBTITLES_H */ |