| /* |
| * SSA/ASS muxer |
| * Copyright (c) 2008 Michael Niedermayer |
| * |
| * 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 |
| */ |
| |
| #include "libavutil/avstring.h" |
| #include "avformat.h" |
| #include "internal.h" |
| |
| #include "libavutil/opt.h" |
| |
| typedef struct DialogueLine { |
| int readorder; |
| char *line; |
| struct DialogueLine *prev, *next; |
| } DialogueLine; |
| |
| typedef struct ASSContext { |
| const AVClass *class; |
| int write_ts; // 0: ssa (timing in payload), 1: ass (matroska like) |
| int expected_readorder; |
| DialogueLine *dialogue_cache; |
| DialogueLine *last_added_dialogue; |
| int cache_size; |
| int ssa_mode; |
| int ignore_readorder; |
| uint8_t *trailer; |
| size_t trailer_size; |
| } ASSContext; |
| |
| static int write_header(AVFormatContext *s) |
| { |
| ASSContext *ass = s->priv_data; |
| AVCodecContext *avctx = s->streams[0]->codec; |
| |
| if (s->nb_streams != 1 || (avctx->codec_id != AV_CODEC_ID_SSA && |
| avctx->codec_id != AV_CODEC_ID_ASS)) { |
| av_log(s, AV_LOG_ERROR, "Exactly one ASS/SSA stream is needed.\n"); |
| return AVERROR(EINVAL); |
| } |
| ass->write_ts = avctx->codec_id == AV_CODEC_ID_ASS; |
| avpriv_set_pts_info(s->streams[0], 64, 1, 100); |
| if (avctx->extradata_size > 0) { |
| size_t header_size = avctx->extradata_size; |
| uint8_t *trailer = strstr(avctx->extradata, "\n[Events]"); |
| |
| if (trailer) |
| trailer = strstr(trailer, "Format:"); |
| if (trailer) |
| trailer = strstr(trailer, "\n"); |
| |
| if (trailer++) { |
| header_size = (trailer - avctx->extradata); |
| ass->trailer_size = avctx->extradata_size - header_size; |
| if (ass->trailer_size) |
| ass->trailer = trailer; |
| } |
| |
| avio_write(s->pb, avctx->extradata, header_size); |
| if (avctx->extradata[header_size - 1] != '\n') |
| avio_write(s->pb, "\r\n", 2); |
| ass->ssa_mode = !strstr(avctx->extradata, "\n[V4+ Styles]"); |
| if (!strstr(avctx->extradata, "\n[Events]")) |
| avio_printf(s->pb, "[Events]\r\nFormat: %s, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n", |
| ass->ssa_mode ? "Marked" : "Layer"); |
| } |
| avio_flush(s->pb); |
| |
| return 0; |
| } |
| |
| static void purge_dialogues(AVFormatContext *s, int force) |
| { |
| int n = 0; |
| ASSContext *ass = s->priv_data; |
| DialogueLine *dialogue = ass->dialogue_cache; |
| |
| while (dialogue && (dialogue->readorder == ass->expected_readorder || force)) { |
| DialogueLine *next = dialogue->next; |
| if (dialogue->readorder != ass->expected_readorder) { |
| av_log(s, AV_LOG_WARNING, "ReadOrder gap found between %d and %d\n", |
| ass->expected_readorder, dialogue->readorder); |
| ass->expected_readorder = dialogue->readorder; |
| } |
| avio_printf(s->pb, "Dialogue: %s\r\n", dialogue->line); |
| if (dialogue == ass->last_added_dialogue) |
| ass->last_added_dialogue = next; |
| av_freep(&dialogue->line); |
| av_free(dialogue); |
| if (next) |
| next->prev = NULL; |
| dialogue = ass->dialogue_cache = next; |
| ass->expected_readorder++; |
| n++; |
| } |
| ass->cache_size -= n; |
| if (n > 1) |
| av_log(s, AV_LOG_DEBUG, "wrote %d ASS lines, cached dialogues: %d, waiting for event id %d\n", |
| n, ass->cache_size, ass->expected_readorder); |
| } |
| |
| static void insert_dialogue(ASSContext *ass, DialogueLine *dialogue) |
| { |
| DialogueLine *cur, *next = NULL, *prev = NULL; |
| |
| /* from the last added to the end of the list */ |
| if (ass->last_added_dialogue) { |
| for (cur = ass->last_added_dialogue; cur; cur = cur->next) { |
| if (cur->readorder > dialogue->readorder) |
| break; |
| prev = cur; |
| next = cur->next; |
| } |
| } |
| |
| /* from the beginning to the last one added */ |
| if (!prev) { |
| next = ass->dialogue_cache; |
| for (cur = next; cur != ass->last_added_dialogue; cur = cur->next) { |
| if (cur->readorder > dialogue->readorder) |
| break; |
| prev = cur; |
| next = cur->next; |
| } |
| } |
| |
| if (prev) { |
| prev->next = dialogue; |
| dialogue->prev = prev; |
| } else { |
| dialogue->prev = ass->dialogue_cache; |
| ass->dialogue_cache = dialogue; |
| } |
| if (next) { |
| next->prev = dialogue; |
| dialogue->next = next; |
| } |
| ass->cache_size++; |
| ass->last_added_dialogue = dialogue; |
| } |
| |
| static int write_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| ASSContext *ass = s->priv_data; |
| |
| if (ass->write_ts) { |
| long int layer; |
| char *p = pkt->data; |
| int64_t start = pkt->pts; |
| int64_t end = start + pkt->duration; |
| int hh1, mm1, ss1, ms1; |
| int hh2, mm2, ss2, ms2; |
| DialogueLine *dialogue = av_mallocz(sizeof(*dialogue)); |
| |
| if (!dialogue) |
| return AVERROR(ENOMEM); |
| |
| dialogue->readorder = strtol(p, &p, 10); |
| if (dialogue->readorder < ass->expected_readorder) |
| av_log(s, AV_LOG_WARNING, "Unexpected ReadOrder %d\n", |
| dialogue->readorder); |
| if (*p == ',') |
| p++; |
| |
| if (ass->ssa_mode && !strncmp(p, "Marked=", 7)) |
| p += 7; |
| |
| layer = strtol(p, &p, 10); |
| if (*p == ',') |
| p++; |
| hh1 = (int)(start / 360000); mm1 = (int)(start / 6000) % 60; |
| hh2 = (int)(end / 360000); mm2 = (int)(end / 6000) % 60; |
| ss1 = (int)(start / 100) % 60; ms1 = (int)(start % 100); |
| ss2 = (int)(end / 100) % 60; ms2 = (int)(end % 100); |
| if (hh1 > 9) hh1 = 9, mm1 = 59, ss1 = 59, ms1 = 99; |
| if (hh2 > 9) hh2 = 9, mm2 = 59, ss2 = 59, ms2 = 99; |
| |
| dialogue->line = av_asprintf("%s%ld,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s", |
| ass->ssa_mode ? "Marked=" : "", |
| layer, hh1, mm1, ss1, ms1, hh2, mm2, ss2, ms2, p); |
| if (!dialogue->line) { |
| av_free(dialogue); |
| return AVERROR(ENOMEM); |
| } |
| insert_dialogue(ass, dialogue); |
| purge_dialogues(s, ass->ignore_readorder); |
| } else { |
| avio_write(s->pb, pkt->data, pkt->size); |
| } |
| |
| return 0; |
| } |
| |
| static int write_trailer(AVFormatContext *s) |
| { |
| ASSContext *ass = s->priv_data; |
| |
| purge_dialogues(s, 1); |
| |
| if (ass->trailer) { |
| avio_write(s->pb, ass->trailer, ass->trailer_size); |
| } |
| |
| return 0; |
| } |
| |
| #define OFFSET(x) offsetof(ASSContext, x) |
| #define E AV_OPT_FLAG_ENCODING_PARAM |
| static const AVOption options[] = { |
| { "ignore_readorder", "write events immediately, even if they're out-of-order", OFFSET(ignore_readorder), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E }, |
| { NULL }, |
| }; |
| |
| static const AVClass ass_class = { |
| .class_name = "ass muxer", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| AVOutputFormat ff_ass_muxer = { |
| .name = "ass", |
| .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"), |
| .mime_type = "text/x-ssa", |
| .extensions = "ass,ssa", |
| .priv_data_size = sizeof(ASSContext), |
| .subtitle_codec = AV_CODEC_ID_SSA, |
| .write_header = write_header, |
| .write_packet = write_packet, |
| .write_trailer = write_trailer, |
| .flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS | AVFMT_TS_NONSTRICT, |
| .priv_class = &ass_class, |
| }; |
