mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
127 lines
4.0 KiB
127 lines
4.0 KiB
/* |
|
* 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.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; |
|
long int layer; |
|
char *p; |
|
|
|
if (sub->rects[i]->type != SUBTITLE_ASS) { |
|
av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n"); |
|
return AVERROR(EINVAL); |
|
} |
|
|
|
#if FF_API_ASS_TIMING |
|
if (!strncmp(ass, "Dialogue: ", 10)) { |
|
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; |
|
} |
|
#endif |
|
|
|
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 AVERROR(EINVAL); |
|
} |
|
|
|
total_len += len; |
|
} |
|
|
|
return total_len; |
|
} |
|
|
|
#if CONFIG_SSA_ENCODER |
|
AVCodec ff_ssa_encoder = { |
|
.name = "ssa", |
|
.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 |
|
|
|
#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
|
|
|