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add missing files in previous commit (ASS encoder and decoder)

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Originally committed as revision 25747 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2010-11-13 14:18:59 +00:00
parent e9c098dbaa
commit 5952be07dc
4 changed files with 250 additions and 0 deletions
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68
libavcodec/ass.c Normal file
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/*
* SSA/ASS common funtions
* 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 "avcodec.h"
#include "ass.h"
void ff_ass_init(AVSubtitle *sub)
{
memset(sub, 0, sizeof(*sub));
}
static int ts_to_string(char *str, int strlen, int ts)
{
int h, m, s;
h = ts/360000; ts -= 360000*h;
m = ts/ 6000; ts -= 6000*m;
s = ts/ 100; ts -= 100*s;
return snprintf(str, strlen, "%d:%02d:%02d.%02d", h, m, s, ts);
}
int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
int ts_start, int ts_end, int raw)
{
int len = 0, dlen, duration = ts_end - ts_start;
char s_start[16], s_end[16], header[48] = {0};
AVSubtitleRect **rects;
if (!raw) {
ts_to_string(s_start, sizeof(s_start), ts_start);
ts_to_string(s_end, sizeof(s_end), ts_end );
len = snprintf(header, sizeof(header), "Dialogue: 0,%s,%s,",
s_start, s_end);
}
dlen = strcspn(dialog, "\n");
dlen += dialog[dlen] == '\n';
rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects));
if (!rects)
return AVERROR(ENOMEM);
sub->rects = rects;
sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration);
rects[sub->num_rects] = av_mallocz(sizeof(*rects[0]));
rects[sub->num_rects]->type = SUBTITLE_ASS;
rects[sub->num_rects]->ass = av_malloc(len + dlen + 1);
strcpy (rects[sub->num_rects]->ass , header);
strncpy(rects[sub->num_rects]->ass + len, dialog, dlen);
sub->num_rects++;
return dlen;
}

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/*
* SSA/ASS common funtions
* 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
*/
#ifndef AVCODEC_ASS_H
#define AVCODEC_ASS_H
#include "avcodec.h"
/**
* Initialize an AVSubtitle structure for use with ff_ass_add_rect().
*
* @param sub pointer to the AVSubtitle
*/
void ff_ass_init(AVSubtitle *sub);
/**
* Add an ASS dialog line to an AVSubtitle as a new AVSubtitleRect.
*
* @param sub pointer to the AVSubtitle
* @param dialog ASS dialog to add to sub
* @param ts_start start timestamp for this dialog (in 1/100 second unit)
* @param ts_end end timestamp for this dialog (in 1/100 second unit)
* @param raw when set to 1, it indicates that dialog contains a whole ASS
* dialog line which should be copied as is.
* when set to 0, it indicates that dialog contains only the Text
* part of the ASS dialog line, the rest of the line
* will be generated.
* @return number of characters read from dialog. It can be less than the whole
* length of dialog, if dialog contains several lines of text.
* A negative value indicates an error.
*/
int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
int ts_start, int ts_end, int raw);
#endif /* AVCODEC_ASS_H */

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/*
* SSA/ASS decoder
* 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 "avcodec.h"
#include "ass.h"
static av_cold int ass_decode_init(AVCodecContext *avctx)
{
avctx->subtitle_header = av_malloc(avctx->extradata_size);
if (!avctx->extradata)
return AVERROR(ENOMEM);
memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size);
avctx->subtitle_header_size = avctx->extradata_size;
return 0;
}
static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr,
AVPacket *avpkt)
{
const char *ptr = avpkt->data;
int len, size = avpkt->size;
ff_ass_init(data);
while (size > 0) {
len = ff_ass_add_rect(data, ptr, 0, 0/* FIXME: duration */, 1);
if (len < 0)
return len;
ptr += len;
size -= len;
}
*got_sub_ptr = avpkt->size > 0;
return avpkt->size;
}
AVCodec ass_decoder = {
.name = "ass",
.long_name = NULL_IF_CONFIG_SMALL("Advanced SubStation Alpha subtitle"),
.type = AVMEDIA_TYPE_SUBTITLE,
.id = CODEC_ID_SSA,
.init = ass_decode_init,
.decode = ass_decode_frame,
};

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/*
* 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 "avcodec.h"
#include "libavutil/avstring.h"
static av_cold int ass_encode_init(AVCodecContext *avctx)
{
avctx->extradata = av_malloc(avctx->subtitle_header_size);
if (!avctx->extradata)
return AVERROR(ENOMEM);
memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size);
avctx->extradata_size = avctx->subtitle_header_size;
return 0;
}
static int ass_encode_frame(AVCodecContext *avctx,
unsigned char *buf, int bufsize, void *data)
{
AVSubtitle *sub = data;
int i, len, total_len = 0;
for (i=0; i<sub->num_rects; i++) {
if (sub->rects[i]->type != SUBTITLE_ASS) {
av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
return -1;
}
len = av_strlcpy(buf+total_len, sub->rects[i]->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;
}
AVCodec ass_encoder = {
.name = "ass",
.long_name = NULL_IF_CONFIG_SMALL("Advanced SubStation Alpha subtitle"),
.type = AVMEDIA_TYPE_SUBTITLE,
.id = CODEC_ID_SSA,
.init = ass_encode_init,
.encode = ass_encode_frame,
};