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![Reimar Döffinger](/assets/img/avatar_default.png)
As far as I can tell the code should not change behaviour depending on locale in any of these places. Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
159 lines
4.8 KiB
C
159 lines
4.8 KiB
C
/*
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* Copyright (c) 2012 Clément Bœsch
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* SAMI subtitle decoder
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* @see http://msdn.microsoft.com/en-us/library/ms971327.aspx
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*/
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#include "ass.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bprint.h"
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typedef struct {
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AVBPrint source;
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AVBPrint content;
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AVBPrint full;
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} SAMIContext;
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static int sami_paragraph_to_ass(AVCodecContext *avctx, const char *src)
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{
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SAMIContext *sami = avctx->priv_data;
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int ret = 0;
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char *tag = NULL;
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char *dupsrc = av_strdup(src);
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char *p = dupsrc;
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av_bprint_clear(&sami->content);
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for (;;) {
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char *saveptr = NULL;
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int prev_chr_is_space = 0;
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AVBPrint *dst = &sami->content;
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/* parse & extract paragraph tag */
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p = av_stristr(p, "<P");
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if (!p)
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break;
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if (p[2] != '>' && !av_isspace(p[2])) { // avoid confusion with tags such as <PRE>
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p++;
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continue;
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}
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if (dst->len) // add a separator with the previous paragraph if there was one
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av_bprintf(dst, "\\N");
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tag = av_strtok(p, ">", &saveptr);
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if (!tag || !saveptr)
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break;
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p = saveptr;
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/* check if the current paragraph is the "source" (speaker name) */
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if (av_stristr(tag, "ID=Source") || av_stristr(tag, "ID=\"Source\"")) {
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dst = &sami->source;
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av_bprint_clear(dst);
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}
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/* if empty event -> skip subtitle */
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while (av_isspace(*p))
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p++;
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if (!strncmp(p, " ", 6)) {
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ret = -1;
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goto end;
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}
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/* extract the text, stripping most of the tags */
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while (*p) {
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if (*p == '<') {
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if (!av_strncasecmp(p, "<P", 2) && (p[2] == '>' || av_isspace(p[2])))
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break;
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if (!av_strncasecmp(p, "<BR", 3))
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av_bprintf(dst, "\\N");
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p++;
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while (*p && *p != '>')
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p++;
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if (!*p)
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break;
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if (*p == '>')
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p++;
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}
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if (!av_isspace(*p))
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av_bprint_chars(dst, *p, 1);
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else if (!prev_chr_is_space)
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av_bprint_chars(dst, ' ', 1);
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prev_chr_is_space = av_isspace(*p);
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p++;
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}
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}
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av_bprint_clear(&sami->full);
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if (sami->source.len)
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av_bprintf(&sami->full, "{\\i1}%s{\\i0}\\N", sami->source.str);
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av_bprintf(&sami->full, "%s\r\n", sami->content.str);
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end:
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av_free(dupsrc);
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return ret;
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}
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static int sami_decode_frame(AVCodecContext *avctx,
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void *data, int *got_sub_ptr, AVPacket *avpkt)
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{
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AVSubtitle *sub = data;
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const char *ptr = avpkt->data;
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SAMIContext *sami = avctx->priv_data;
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if (ptr && avpkt->size > 0 && !sami_paragraph_to_ass(avctx, ptr)) {
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int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100});
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int ts_duration = avpkt->duration != -1 ?
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av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1;
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ff_ass_add_rect(sub, sami->full.str, ts_start, ts_duration, 0);
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}
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*got_sub_ptr = sub->num_rects > 0;
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return avpkt->size;
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}
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static av_cold int sami_init(AVCodecContext *avctx)
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{
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SAMIContext *sami = avctx->priv_data;
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av_bprint_init(&sami->source, 0, 2048);
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av_bprint_init(&sami->content, 0, 2048);
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av_bprint_init(&sami->full, 0, 2048);
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return ff_ass_subtitle_header_default(avctx);
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}
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static av_cold int sami_close(AVCodecContext *avctx)
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{
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SAMIContext *sami = avctx->priv_data;
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av_bprint_finalize(&sami->source, NULL);
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av_bprint_finalize(&sami->content, NULL);
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av_bprint_finalize(&sami->full, NULL);
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return 0;
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}
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AVCodec ff_sami_decoder = {
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.name = "sami",
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.long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle"),
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.type = AVMEDIA_TYPE_SUBTITLE,
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.id = AV_CODEC_ID_SAMI,
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.priv_data_size = sizeof(SAMIContext),
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.init = sami_init,
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.close = sami_close,
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.decode = sami_decode_frame,
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};
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