mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-21 06:50:44 +00:00
133 lines
4.2 KiB
C
133 lines
4.2 KiB
C
/*
|
|
* SSA/ASS encoder
|
|
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
|
|
*
|
|
* 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 <string.h>
|
|
|
|
#include "avcodec.h"
|
|
#include "ass_split.h"
|
|
#include "ass.h"
|
|
#include "libavutil/avstring.h"
|
|
#include "libavutil/internal.h"
|
|
#include "libavutil/mem.h"
|
|
|
|
typedef struct {
|
|
int id; ///< current event id, ReadOrder field
|
|
} ASSEncodeContext;
|
|
|
|
static av_cold int ass_encode_init(AVCodecContext *avctx)
|
|
{
|
|
avctx->extradata = av_malloc(avctx->subtitle_header_size + 1);
|
|
if (!avctx->extradata)
|
|
return AVERROR(ENOMEM);
|
|
memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size);
|
|
avctx->extradata_size = avctx->subtitle_header_size;
|
|
avctx->extradata[avctx->extradata_size] = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int ass_encode_frame(AVCodecContext *avctx,
|
|
unsigned char *buf, int bufsize,
|
|
const AVSubtitle *sub)
|
|
{
|
|
ASSEncodeContext *s = avctx->priv_data;
|
|
int i, len, total_len = 0;
|
|
|
|
for (i=0; i<sub->num_rects; i++) {
|
|
char ass_line[2048];
|
|
const char *ass = sub->rects[i]->ass;
|
|
|
|
if (sub->rects[i]->type != SUBTITLE_ASS) {
|
|
av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
|
|
return -1;
|
|
}
|
|
|
|
if (strncmp(ass, "Dialogue: ", 10)) {
|
|
av_log(avctx, AV_LOG_ERROR, "AVSubtitle rectangle ass \"%s\""
|
|
" does not look like a SSA markup\n", ass);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (avctx->codec->id == AV_CODEC_ID_ASS) {
|
|
long int layer;
|
|
char *p;
|
|
|
|
if (i > 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "ASS encoder supports only one "
|
|
"ASS rectangle field.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
ass += 10; // skip "Dialogue: "
|
|
/* parse Layer field. If it's a Marked field, the content
|
|
* will be "Marked=N" instead of the layer num, so we will
|
|
* have layer=0, which is fine. */
|
|
layer = strtol(ass, &p, 10);
|
|
|
|
#define SKIP_ENTRY(ptr) do { \
|
|
char *sep = strchr(ptr, ','); \
|
|
if (sep) \
|
|
ptr = sep + 1; \
|
|
} while (0)
|
|
|
|
SKIP_ENTRY(p); // skip layer or marked
|
|
SKIP_ENTRY(p); // skip start timestamp
|
|
SKIP_ENTRY(p); // skip end timestamp
|
|
snprintf(ass_line, sizeof(ass_line), "%d,%ld,%s", ++s->id, layer, p);
|
|
ass_line[strcspn(ass_line, "\r\n")] = 0;
|
|
ass = ass_line;
|
|
}
|
|
len = av_strlcpy(buf+total_len, ass, bufsize-total_len);
|
|
|
|
if (len > bufsize-total_len-1) {
|
|
av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
|
|
return -1;
|
|
}
|
|
|
|
total_len += len;
|
|
}
|
|
|
|
return total_len;
|
|
}
|
|
|
|
#if CONFIG_SSA_ENCODER
|
|
AVCodec ff_ssa_encoder = {
|
|
.name = "ssa",
|
|
.long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
|
|
.type = AVMEDIA_TYPE_SUBTITLE,
|
|
.id = AV_CODEC_ID_SSA,
|
|
.init = ass_encode_init,
|
|
.encode_sub = ass_encode_frame,
|
|
.priv_data_size = sizeof(ASSEncodeContext),
|
|
};
|
|
#endif
|
|
|
|
#if CONFIG_ASS_ENCODER
|
|
AVCodec ff_ass_encoder = {
|
|
.name = "ass",
|
|
.long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"),
|
|
.type = AVMEDIA_TYPE_SUBTITLE,
|
|
.id = AV_CODEC_ID_ASS,
|
|
.init = ass_encode_init,
|
|
.encode_sub = ass_encode_frame,
|
|
.priv_data_size = sizeof(ASSEncodeContext),
|
|
};
|
|
#endif
|