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https://github.com/FFmpeg/FFmpeg.git
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250 lines
8.0 KiB
C
250 lines
8.0 KiB
C
/*
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* SSA/ASS muxer
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* Copyright (c) 2008 Michael Niedermayer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h"
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#include "avformat.h"
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#include "internal.h"
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#include "libavutil/opt.h"
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typedef struct DialogueLine {
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int readorder;
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char *line;
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struct DialogueLine *prev, *next;
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} DialogueLine;
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typedef struct ASSContext {
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const AVClass *class;
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int write_ts; // 0: ssa (timing in payload), 1: ass (matroska like)
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int expected_readorder;
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DialogueLine *dialogue_cache;
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DialogueLine *last_added_dialogue;
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int cache_size;
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int ssa_mode;
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int ignore_readorder;
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uint8_t *trailer;
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size_t trailer_size;
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} ASSContext;
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static int write_header(AVFormatContext *s)
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{
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ASSContext *ass = s->priv_data;
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AVCodecContext *avctx = s->streams[0]->codec;
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if (s->nb_streams != 1 || (avctx->codec_id != AV_CODEC_ID_SSA &&
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avctx->codec_id != AV_CODEC_ID_ASS)) {
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av_log(s, AV_LOG_ERROR, "Exactly one ASS/SSA stream is needed.\n");
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return AVERROR(EINVAL);
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}
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ass->write_ts = avctx->codec_id == AV_CODEC_ID_ASS;
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avpriv_set_pts_info(s->streams[0], 64, 1, 100);
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if (avctx->extradata_size > 0) {
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size_t header_size = avctx->extradata_size;
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uint8_t *trailer = strstr(avctx->extradata, "\n[Events]");
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if (trailer)
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trailer = strstr(trailer, "Format:");
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if (trailer)
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trailer = strstr(trailer, "\n");
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if (trailer++) {
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header_size = (trailer - avctx->extradata);
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ass->trailer_size = avctx->extradata_size - header_size;
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if (ass->trailer_size)
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ass->trailer = trailer;
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}
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avio_write(s->pb, avctx->extradata, header_size);
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if (avctx->extradata[header_size - 1] != '\n')
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avio_write(s->pb, "\r\n", 2);
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ass->ssa_mode = !strstr(avctx->extradata, "\n[V4+ Styles]");
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if (!strstr(avctx->extradata, "\n[Events]"))
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avio_printf(s->pb, "[Events]\r\nFormat: %s, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n",
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ass->ssa_mode ? "Marked" : "Layer");
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}
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avio_flush(s->pb);
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return 0;
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}
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static void purge_dialogues(AVFormatContext *s, int force)
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{
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int n = 0;
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ASSContext *ass = s->priv_data;
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DialogueLine *dialogue = ass->dialogue_cache;
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while (dialogue && (dialogue->readorder == ass->expected_readorder || force)) {
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DialogueLine *next = dialogue->next;
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if (dialogue->readorder != ass->expected_readorder) {
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av_log(s, AV_LOG_WARNING, "ReadOrder gap found between %d and %d\n",
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ass->expected_readorder, dialogue->readorder);
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ass->expected_readorder = dialogue->readorder;
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}
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avio_printf(s->pb, "Dialogue: %s\r\n", dialogue->line);
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if (dialogue == ass->last_added_dialogue)
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ass->last_added_dialogue = next;
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av_freep(&dialogue->line);
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av_free(dialogue);
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if (next)
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next->prev = NULL;
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dialogue = ass->dialogue_cache = next;
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ass->expected_readorder++;
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n++;
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}
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ass->cache_size -= n;
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if (n > 1)
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av_log(s, AV_LOG_DEBUG, "wrote %d ASS lines, cached dialogues: %d, waiting for event id %d\n",
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n, ass->cache_size, ass->expected_readorder);
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}
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static void insert_dialogue(ASSContext *ass, DialogueLine *dialogue)
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{
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DialogueLine *cur, *next = NULL, *prev = NULL;
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/* from the last added to the end of the list */
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if (ass->last_added_dialogue) {
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for (cur = ass->last_added_dialogue; cur; cur = cur->next) {
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if (cur->readorder > dialogue->readorder)
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break;
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prev = cur;
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next = cur->next;
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}
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}
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/* from the beginning to the last one added */
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if (!prev) {
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next = ass->dialogue_cache;
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for (cur = next; cur != ass->last_added_dialogue; cur = cur->next) {
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if (cur->readorder > dialogue->readorder)
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break;
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prev = cur;
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next = cur->next;
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}
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}
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if (prev) {
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prev->next = dialogue;
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dialogue->prev = prev;
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} else {
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dialogue->prev = ass->dialogue_cache;
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ass->dialogue_cache = dialogue;
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}
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if (next) {
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next->prev = dialogue;
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dialogue->next = next;
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}
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ass->cache_size++;
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ass->last_added_dialogue = dialogue;
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}
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static int write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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ASSContext *ass = s->priv_data;
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if (ass->write_ts) {
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long int layer;
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char *p = pkt->data;
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int64_t start = pkt->pts;
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int64_t end = start + pkt->duration;
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int hh1, mm1, ss1, ms1;
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int hh2, mm2, ss2, ms2;
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DialogueLine *dialogue = av_mallocz(sizeof(*dialogue));
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if (!dialogue)
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return AVERROR(ENOMEM);
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dialogue->readorder = strtol(p, &p, 10);
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if (dialogue->readorder < ass->expected_readorder)
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av_log(s, AV_LOG_WARNING, "Unexpected ReadOrder %d\n",
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dialogue->readorder);
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if (*p == ',')
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p++;
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if (ass->ssa_mode && !strncmp(p, "Marked=", 7))
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p += 7;
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layer = strtol(p, &p, 10);
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if (*p == ',')
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p++;
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hh1 = (int)(start / 360000); mm1 = (int)(start / 6000) % 60;
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hh2 = (int)(end / 360000); mm2 = (int)(end / 6000) % 60;
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ss1 = (int)(start / 100) % 60; ms1 = (int)(start % 100);
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ss2 = (int)(end / 100) % 60; ms2 = (int)(end % 100);
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if (hh1 > 9) hh1 = 9, mm1 = 59, ss1 = 59, ms1 = 99;
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if (hh2 > 9) hh2 = 9, mm2 = 59, ss2 = 59, ms2 = 99;
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dialogue->line = av_asprintf("%s%ld,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s",
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ass->ssa_mode ? "Marked=" : "",
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layer, hh1, mm1, ss1, ms1, hh2, mm2, ss2, ms2, p);
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if (!dialogue->line) {
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av_free(dialogue);
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return AVERROR(ENOMEM);
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}
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insert_dialogue(ass, dialogue);
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purge_dialogues(s, ass->ignore_readorder);
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} else {
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avio_write(s->pb, pkt->data, pkt->size);
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}
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return 0;
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}
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static int write_trailer(AVFormatContext *s)
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{
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ASSContext *ass = s->priv_data;
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purge_dialogues(s, 1);
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if (ass->trailer) {
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avio_write(s->pb, ass->trailer, ass->trailer_size);
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}
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return 0;
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}
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#define OFFSET(x) offsetof(ASSContext, x)
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#define E AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "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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{ NULL },
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};
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static const AVClass ass_class = {
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.class_name = "ass muxer",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVOutputFormat ff_ass_muxer = {
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.name = "ass",
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.long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
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.mime_type = "text/x-ssa",
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.extensions = "ass,ssa",
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.priv_data_size = sizeof(ASSContext),
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.subtitle_codec = AV_CODEC_ID_SSA,
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.write_header = write_header,
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.write_packet = write_packet,
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.write_trailer = write_trailer,
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.flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS | AVFMT_TS_NONSTRICT,
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.priv_class = &ass_class,
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};
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