0,0 → 1,132 |
/* |
* 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 |