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https://github.com/FFmpeg/FFmpeg.git
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a247ac640d
Given that the AVCodec.next pointer has now been removed, most of the AVCodecs are not modified at all any more and can therefore be made const (as this patch does); the only exceptions are the very few codecs for external libraries that have a init_static_data callback. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
194 lines
5.8 KiB
C
194 lines
5.8 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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#include "htmlsubtitles.h"
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typedef struct {
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AVBPrint source;
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AVBPrint content;
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AVBPrint encoded_source;
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AVBPrint encoded_content;
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AVBPrint full;
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int readorder;
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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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AVBPrint *dst_content = &sami->encoded_content;
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AVBPrint *dst_source = &sami->encoded_source;
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if (!dupsrc)
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return AVERROR(ENOMEM);
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av_bprint_clear(&sami->encoded_content);
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av_bprint_clear(&sami->content);
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av_bprint_clear(&sami->encoded_source);
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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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}
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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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continue;
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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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ret = ff_htmlmarkup_to_ass(avctx, dst_source, sami->source.str);
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if (ret < 0)
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goto end;
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av_bprintf(&sami->full, "{\\i1}%s{\\i0}\\N", sami->encoded_source.str);
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}
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ret = ff_htmlmarkup_to_ass(avctx, dst_content, sami->content.str);
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if (ret < 0)
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goto end;
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av_bprintf(&sami->full, "%s", sami->encoded_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) {
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int ret = sami_paragraph_to_ass(avctx, ptr);
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if (ret < 0)
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return ret;
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// TODO: pass escaped sami->encoded_source.str as source
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ret = ff_ass_add_rect(sub, sami->full.str, sami->readorder++, 0, NULL, NULL);
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if (ret < 0)
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return ret;
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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->encoded_source, 0, 2048);
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av_bprint_init(&sami->encoded_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->encoded_source, NULL);
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av_bprint_finalize(&sami->encoded_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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static void sami_flush(AVCodecContext *avctx)
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{
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SAMIContext *sami = avctx->priv_data;
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if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
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sami->readorder = 0;
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}
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const 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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.flush = sami_flush,
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};
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