226 lines
7.3 KiB
C
226 lines
7.3 KiB
C
/*
|
|
* 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;
|
|
} 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) {
|
|
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 (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)
|
|
{
|
|
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"),
|
|
.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,
|
|
};
|