0,0 → 1,158 |
/* |
* Copyright (c) 2012 Clément Bœsch |
* |
* 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 |
*/ |
|
/** |
* @file |
* SAMI subtitle decoder |
* @see http://msdn.microsoft.com/en-us/library/ms971327.aspx |
*/ |
|
#include "ass.h" |
#include "libavutil/avstring.h" |
#include "libavutil/bprint.h" |
|
typedef struct { |
AVBPrint source; |
AVBPrint content; |
AVBPrint full; |
} SAMIContext; |
|
static int sami_paragraph_to_ass(AVCodecContext *avctx, const char *src) |
{ |
SAMIContext *sami = avctx->priv_data; |
int ret = 0; |
char *tag = NULL; |
char *dupsrc = av_strdup(src); |
char *p = dupsrc; |
|
av_bprint_clear(&sami->content); |
for (;;) { |
char *saveptr = NULL; |
int prev_chr_is_space = 0; |
AVBPrint *dst = &sami->content; |
|
/* parse & extract paragraph tag */ |
p = av_stristr(p, "<P"); |
if (!p) |
break; |
if (p[2] != '>' && !av_isspace(p[2])) { // avoid confusion with tags such as <PRE> |
p++; |
continue; |
} |
if (dst->len) // add a separator with the previous paragraph if there was one |
av_bprintf(dst, "\\N"); |
tag = av_strtok(p, ">", &saveptr); |
if (!tag || !saveptr) |
break; |
p = saveptr; |
|
/* check if the current paragraph is the "source" (speaker name) */ |
if (av_stristr(tag, "ID=Source") || av_stristr(tag, "ID=\"Source\"")) { |
dst = &sami->source; |
av_bprint_clear(dst); |
} |
|
/* if empty event -> skip subtitle */ |
while (av_isspace(*p)) |
p++; |
if (!strncmp(p, " ", 6)) { |
ret = -1; |
goto end; |
} |
|
/* extract the text, stripping most of the tags */ |
while (*p) { |
if (*p == '<') { |
if (!av_strncasecmp(p, "<P", 2) && (p[2] == '>' || av_isspace(p[2]))) |
break; |
if (!av_strncasecmp(p, "<BR", 3)) |
av_bprintf(dst, "\\N"); |
p++; |
while (*p && *p != '>') |
p++; |
if (!*p) |
break; |
if (*p == '>') |
p++; |
} |
if (!av_isspace(*p)) |
av_bprint_chars(dst, *p, 1); |
else if (!prev_chr_is_space) |
av_bprint_chars(dst, ' ', 1); |
prev_chr_is_space = av_isspace(*p); |
p++; |
} |
} |
|
av_bprint_clear(&sami->full); |
if (sami->source.len) |
av_bprintf(&sami->full, "{\\i1}%s{\\i0}\\N", sami->source.str); |
av_bprintf(&sami->full, "%s\r\n", sami->content.str); |
|
end: |
av_free(dupsrc); |
return ret; |
} |
|
static int sami_decode_frame(AVCodecContext *avctx, |
void *data, int *got_sub_ptr, AVPacket *avpkt) |
{ |
AVSubtitle *sub = data; |
const char *ptr = avpkt->data; |
SAMIContext *sami = avctx->priv_data; |
|
if (ptr && avpkt->size > 0 && !sami_paragraph_to_ass(avctx, ptr)) { |
int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100}); |
int ts_duration = avpkt->duration != -1 ? |
av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1; |
ff_ass_add_rect(sub, sami->full.str, ts_start, ts_duration, 0); |
} |
*got_sub_ptr = sub->num_rects > 0; |
return avpkt->size; |
} |
|
static av_cold int sami_init(AVCodecContext *avctx) |
{ |
SAMIContext *sami = avctx->priv_data; |
av_bprint_init(&sami->source, 0, 2048); |
av_bprint_init(&sami->content, 0, 2048); |
av_bprint_init(&sami->full, 0, 2048); |
return ff_ass_subtitle_header_default(avctx); |
} |
|
static av_cold int sami_close(AVCodecContext *avctx) |
{ |
SAMIContext *sami = avctx->priv_data; |
av_bprint_finalize(&sami->source, NULL); |
av_bprint_finalize(&sami->content, NULL); |
av_bprint_finalize(&sami->full, NULL); |
return 0; |
} |
|
AVCodec ff_sami_decoder = { |
.name = "sami", |
.long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle"), |
.type = AVMEDIA_TYPE_SUBTITLE, |
.id = AV_CODEC_ID_SAMI, |
.priv_data_size = sizeof(SAMIContext), |
.init = sami_init, |
.close = sami_close, |
.decode = sami_decode_frame, |
}; |