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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6147 | serge | 1 | /* |
| 2 | * SSA/ASS muxer |
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| 3 | * Copyright (c) 2008 Michael Niedermayer |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavutil/avstring.h" |
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| 23 | #include "avformat.h" |
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| 24 | #include "internal.h" |
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| 25 | |||
| 26 | #include "libavutil/opt.h" |
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| 27 | |||
| 28 | typedef struct DialogueLine { |
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| 29 | int readorder; |
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| 30 | char *line; |
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| 31 | struct DialogueLine *prev, *next; |
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| 32 | } DialogueLine; |
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| 33 | |||
| 34 | typedef struct ASSContext { |
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| 35 | const AVClass *class; |
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| 36 | int write_ts; // 0: ssa (timing in payload), 1: ass (matroska like) |
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| 37 | int expected_readorder; |
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| 38 | DialogueLine *dialogue_cache; |
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| 39 | DialogueLine *last_added_dialogue; |
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| 40 | int cache_size; |
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| 41 | int ssa_mode; |
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| 42 | int ignore_readorder; |
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| 43 | uint8_t *trailer; |
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| 44 | size_t trailer_size; |
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| 45 | } ASSContext; |
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| 46 | |||
| 47 | static int write_header(AVFormatContext *s) |
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| 48 | { |
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| 49 | ASSContext *ass = s->priv_data; |
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| 50 | AVCodecContext *avctx = s->streams[0]->codec; |
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| 51 | |||
| 52 | if (s->nb_streams != 1 || (avctx->codec_id != AV_CODEC_ID_SSA && |
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| 53 | avctx->codec_id != AV_CODEC_ID_ASS)) { |
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| 54 | av_log(s, AV_LOG_ERROR, "Exactly one ASS/SSA stream is needed.\n"); |
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| 55 | return AVERROR(EINVAL); |
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| 56 | } |
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| 57 | ass->write_ts = avctx->codec_id == AV_CODEC_ID_ASS; |
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| 58 | avpriv_set_pts_info(s->streams[0], 64, 1, 100); |
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| 59 | if (avctx->extradata_size > 0) { |
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| 60 | size_t header_size = avctx->extradata_size; |
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| 61 | uint8_t *trailer = strstr(avctx->extradata, "\n[Events]"); |
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| 62 | |||
| 63 | if (trailer) |
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| 64 | trailer = strstr(trailer, "Format:"); |
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| 65 | if (trailer) |
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| 66 | trailer = strstr(trailer, "\n"); |
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| 67 | |||
| 68 | if (trailer++) { |
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| 69 | header_size = (trailer - avctx->extradata); |
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| 70 | ass->trailer_size = avctx->extradata_size - header_size; |
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| 71 | if (ass->trailer_size) |
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| 72 | ass->trailer = trailer; |
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| 73 | } |
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| 74 | |||
| 75 | avio_write(s->pb, avctx->extradata, header_size); |
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| 76 | if (avctx->extradata[header_size - 1] != '\n') |
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| 77 | avio_write(s->pb, "\r\n", 2); |
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| 78 | ass->ssa_mode = !strstr(avctx->extradata, "\n[V4+ Styles]"); |
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| 79 | if (!strstr(avctx->extradata, "\n[Events]")) |
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| 80 | avio_printf(s->pb, "[Events]\r\nFormat: %s, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n", |
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| 81 | ass->ssa_mode ? "Marked" : "Layer"); |
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| 82 | } |
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| 83 | avio_flush(s->pb); |
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| 84 | |||
| 85 | return 0; |
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| 86 | } |
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| 87 | |||
| 88 | static void purge_dialogues(AVFormatContext *s, int force) |
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| 89 | { |
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| 90 | int n = 0; |
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| 91 | ASSContext *ass = s->priv_data; |
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| 92 | DialogueLine *dialogue = ass->dialogue_cache; |
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| 93 | |||
| 94 | while (dialogue && (dialogue->readorder == ass->expected_readorder || force)) { |
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| 95 | DialogueLine *next = dialogue->next; |
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| 96 | if (dialogue->readorder != ass->expected_readorder) { |
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| 97 | av_log(s, AV_LOG_WARNING, "ReadOrder gap found between %d and %d\n", |
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| 98 | ass->expected_readorder, dialogue->readorder); |
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| 99 | ass->expected_readorder = dialogue->readorder; |
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| 100 | } |
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| 101 | avio_printf(s->pb, "Dialogue: %s\r\n", dialogue->line); |
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| 102 | if (dialogue == ass->last_added_dialogue) |
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| 103 | ass->last_added_dialogue = next; |
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| 104 | av_freep(&dialogue->line); |
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| 105 | av_free(dialogue); |
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| 106 | if (next) |
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| 107 | next->prev = NULL; |
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| 108 | dialogue = ass->dialogue_cache = next; |
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| 109 | ass->expected_readorder++; |
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| 110 | n++; |
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| 111 | } |
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| 112 | ass->cache_size -= n; |
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| 113 | if (n > 1) |
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| 114 | av_log(s, AV_LOG_DEBUG, "wrote %d ASS lines, cached dialogues: %d, waiting for event id %d\n", |
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| 115 | n, ass->cache_size, ass->expected_readorder); |
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| 116 | } |
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| 117 | |||
| 118 | static void insert_dialogue(ASSContext *ass, DialogueLine *dialogue) |
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| 119 | { |
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| 120 | DialogueLine *cur, *next = NULL, *prev = NULL; |
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| 121 | |||
| 122 | /* from the last added to the end of the list */ |
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| 123 | if (ass->last_added_dialogue) { |
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| 124 | for (cur = ass->last_added_dialogue; cur; cur = cur->next) { |
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| 125 | if (cur->readorder > dialogue->readorder) |
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| 126 | break; |
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| 127 | prev = cur; |
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| 128 | next = cur->next; |
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| 129 | } |
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| 130 | } |
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| 131 | |||
| 132 | /* from the beginning to the last one added */ |
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| 133 | if (!prev) { |
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| 134 | next = ass->dialogue_cache; |
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| 135 | for (cur = next; cur != ass->last_added_dialogue; cur = cur->next) { |
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| 136 | if (cur->readorder > dialogue->readorder) |
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| 137 | break; |
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| 138 | prev = cur; |
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| 139 | next = cur->next; |
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| 140 | } |
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| 141 | } |
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| 142 | |||
| 143 | if (prev) { |
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| 144 | prev->next = dialogue; |
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| 145 | dialogue->prev = prev; |
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| 146 | } else { |
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| 147 | dialogue->prev = ass->dialogue_cache; |
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| 148 | ass->dialogue_cache = dialogue; |
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| 149 | } |
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| 150 | if (next) { |
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| 151 | next->prev = dialogue; |
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| 152 | dialogue->next = next; |
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| 153 | } |
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| 154 | ass->cache_size++; |
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| 155 | ass->last_added_dialogue = dialogue; |
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| 156 | } |
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| 157 | |||
| 158 | static int write_packet(AVFormatContext *s, AVPacket *pkt) |
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| 159 | { |
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| 160 | ASSContext *ass = s->priv_data; |
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| 161 | |||
| 162 | if (ass->write_ts) { |
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| 163 | long int layer; |
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| 164 | char *p = pkt->data; |
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| 165 | int64_t start = pkt->pts; |
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| 166 | int64_t end = start + pkt->duration; |
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| 167 | int hh1, mm1, ss1, ms1; |
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| 168 | int hh2, mm2, ss2, ms2; |
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| 169 | DialogueLine *dialogue = av_mallocz(sizeof(*dialogue)); |
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| 170 | |||
| 171 | if (!dialogue) |
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| 172 | return AVERROR(ENOMEM); |
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| 173 | |||
| 174 | dialogue->readorder = strtol(p, &p, 10); |
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| 175 | if (dialogue->readorder < ass->expected_readorder) |
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| 176 | av_log(s, AV_LOG_WARNING, "Unexpected ReadOrder %d\n", |
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| 177 | dialogue->readorder); |
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| 178 | if (*p == ',') |
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| 179 | p++; |
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| 180 | |||
| 181 | if (ass->ssa_mode && !strncmp(p, "Marked=", 7)) |
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| 182 | p += 7; |
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| 183 | |||
| 184 | layer = strtol(p, &p, 10); |
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| 185 | if (*p == ',') |
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| 186 | p++; |
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| 187 | hh1 = (int)(start / 360000); mm1 = (int)(start / 6000) % 60; |
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| 188 | hh2 = (int)(end / 360000); mm2 = (int)(end / 6000) % 60; |
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| 189 | ss1 = (int)(start / 100) % 60; ms1 = (int)(start % 100); |
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| 190 | ss2 = (int)(end / 100) % 60; ms2 = (int)(end % 100); |
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| 191 | if (hh1 > 9) hh1 = 9, mm1 = 59, ss1 = 59, ms1 = 99; |
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| 192 | if (hh2 > 9) hh2 = 9, mm2 = 59, ss2 = 59, ms2 = 99; |
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| 193 | |||
| 194 | dialogue->line = av_asprintf("%s%ld,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s", |
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| 195 | ass->ssa_mode ? "Marked=" : "", |
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| 196 | layer, hh1, mm1, ss1, ms1, hh2, mm2, ss2, ms2, p); |
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| 197 | if (!dialogue->line) { |
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| 198 | av_free(dialogue); |
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| 199 | return AVERROR(ENOMEM); |
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| 200 | } |
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| 201 | insert_dialogue(ass, dialogue); |
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| 202 | purge_dialogues(s, ass->ignore_readorder); |
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| 203 | } else { |
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| 204 | avio_write(s->pb, pkt->data, pkt->size); |
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| 205 | } |
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| 206 | |||
| 207 | return 0; |
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| 208 | } |
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| 209 | |||
| 210 | static int write_trailer(AVFormatContext *s) |
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| 211 | { |
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| 212 | ASSContext *ass = s->priv_data; |
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| 213 | |||
| 214 | purge_dialogues(s, 1); |
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| 215 | |||
| 216 | if (ass->trailer) { |
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| 217 | avio_write(s->pb, ass->trailer, ass->trailer_size); |
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| 218 | } |
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| 219 | |||
| 220 | return 0; |
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| 221 | } |
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| 222 | |||
| 223 | #define OFFSET(x) offsetof(ASSContext, x) |
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| 224 | #define E AV_OPT_FLAG_ENCODING_PARAM |
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| 225 | static const AVOption options[] = { |
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| 226 | { "ignore_readorder", "write events immediately, even if they're out-of-order", OFFSET(ignore_readorder), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E }, |
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| 227 | { NULL }, |
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| 228 | }; |
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| 229 | |||
| 230 | static const AVClass ass_class = { |
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| 231 | .class_name = "ass muxer", |
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| 232 | .item_name = av_default_item_name, |
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| 233 | .option = options, |
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| 234 | .version = LIBAVUTIL_VERSION_INT, |
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| 235 | }; |
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| 236 | |||
| 237 | AVOutputFormat ff_ass_muxer = { |
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| 238 | .name = "ass", |
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| 239 | .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"), |
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| 240 | .mime_type = "text/x-ssa", |
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| 241 | .extensions = "ass,ssa", |
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| 242 | .priv_data_size = sizeof(ASSContext), |
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| 243 | .subtitle_codec = AV_CODEC_ID_SSA, |
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| 244 | .write_header = write_header, |
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| 245 | .write_packet = write_packet, |
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| 246 | .write_trailer = write_trailer, |
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| 247 | .flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS | AVFMT_TS_NONSTRICT, |
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| 248 | .priv_class = &ass_class, |
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| 249 | }; |