diff options
Diffstat (limited to 'libavformat/assenc.c')
-rw-r--r-- | libavformat/assenc.c | 195 |
1 files changed, 167 insertions, 28 deletions
diff --git a/libavformat/assenc.c b/libavformat/assenc.c index 751485d..bde1096 100644 --- a/libavformat/assenc.c +++ b/libavformat/assenc.c @@ -2,76 +2,214 @@ * SSA/ASS muxer * Copyright (c) 2008 Michael Niedermayer * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * 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{ - unsigned int extra_index; + 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; }ASSContext; static int write_header(AVFormatContext *s) { ASSContext *ass = s->priv_data; AVCodecContext *avctx= s->streams[0]->codec; - uint8_t *last= NULL; - if(s->nb_streams != 1 || avctx->codec_id != AV_CODEC_ID_SSA){ + 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 -1; + 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) { + avio_write(s->pb, avctx->extradata, avctx->extradata_size); + if (avctx->extradata[avctx->extradata_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(ass->extra_index < avctx->extradata_size){ - uint8_t *p = avctx->extradata + ass->extra_index; - uint8_t *end= strchr(p, '\n'); - if(!end) end= avctx->extradata + avctx->extradata_size; - else end++; + 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_free(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); +} - avio_write(s->pb, p, end-p); - ass->extra_index += end-p; +static void insert_dialogue(ASSContext *ass, DialogueLine *dialogue) +{ + DialogueLine *cur, *next = NULL, *prev = NULL; - if(last && !memcmp(last, "[Events]", 8)) - break; - last=p; + /* 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; + } } - avio_flush(s->pb); + /* 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; + } + } - return 0; + 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) { - avio_write(s->pb, pkt->data, pkt->size); + 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; - AVCodecContext *avctx= s->streams[0]->codec; - - avio_write(s->pb, avctx->extradata + ass->extra_index, - avctx->extradata_size - ass->extra_index); - + purge_dialogues(s, 1); 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_INT, {.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"), @@ -82,5 +220,6 @@ AVOutputFormat ff_ass_muxer = { .write_header = write_header, .write_packet = write_packet, .write_trailer = write_trailer, - .flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS, + .flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS | AVFMT_TS_NONSTRICT, + .priv_class = &ass_class, }; |