mirror of https://git.ffmpeg.org/ffmpeg.git
146 lines
3.9 KiB
C
146 lines
3.9 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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#include "avformat.h"
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#include "subtitles.h"
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#include "libavutil/avstring.h"
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AVPacket *ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q,
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const uint8_t *event, int len, int merge)
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{
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AVPacket *subs, *sub;
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if (merge && q->nb_subs > 0) {
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/* merge with previous event */
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int old_len;
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sub = &q->subs[q->nb_subs - 1];
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old_len = sub->size;
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if (av_grow_packet(sub, len) < 0)
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return NULL;
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memcpy(sub->data + old_len, event, len);
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} else {
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/* new event */
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if (q->nb_subs >= INT_MAX/sizeof(*q->subs) - 1)
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return NULL;
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subs = av_fast_realloc(q->subs, &q->allocated_size,
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(q->nb_subs + 1) * sizeof(*q->subs));
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if (!subs)
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return NULL;
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q->subs = subs;
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sub = &subs[q->nb_subs++];
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if (av_new_packet(sub, len) < 0)
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return NULL;
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sub->destruct = NULL;
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sub->flags |= AV_PKT_FLAG_KEY;
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sub->pts = sub->dts = 0;
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memcpy(sub->data, event, len);
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}
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return sub;
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}
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static int cmp_pkt_sub(const void *a, const void *b)
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{
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const AVPacket *s1 = a;
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const AVPacket *s2 = b;
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if (s1->pts == s2->pts) {
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if (s1->pos == s2->pos)
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return 0;
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return s1->pos > s2->pos ? 1 : -1;
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}
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return s1->pts > s2->pts ? 1 : -1;
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}
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void ff_subtitles_queue_finalize(FFDemuxSubtitlesQueue *q)
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{
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int i;
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qsort(q->subs, q->nb_subs, sizeof(*q->subs), cmp_pkt_sub);
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for (i = 0; i < q->nb_subs; i++)
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if (q->subs[i].duration == -1 && i < q->nb_subs - 1)
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q->subs[i].duration = q->subs[i + 1].pts - q->subs[i].pts;
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}
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int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
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{
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AVPacket *sub = q->subs + q->current_sub_idx;
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if (q->current_sub_idx == q->nb_subs)
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return AVERROR_EOF;
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*pkt = *sub;
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pkt->dts = pkt->pts;
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q->current_sub_idx++;
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return 0;
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}
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void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
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{
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int i;
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for (i = 0; i < q->nb_subs; i++)
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av_destruct_packet(&q->subs[i]);
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av_freep(&q->subs);
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q->nb_subs = q->allocated_size = q->current_sub_idx = 0;
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}
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int ff_smil_extract_next_chunk(AVIOContext *pb, AVBPrint *buf, char *c)
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{
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int i = 0;
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char end_chr;
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if (!*c) // cached char?
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*c = avio_r8(pb);
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if (!*c)
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return 0;
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end_chr = *c == '<' ? '>' : '<';
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do {
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av_bprint_chars(buf, *c, 1);
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*c = avio_r8(pb);
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i++;
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} while (*c != end_chr && *c);
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if (end_chr == '>') {
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av_bprint_chars(buf, '>', 1);
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*c = 0;
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}
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return i;
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}
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const char *ff_smil_get_attr_ptr(const char *s, const char *attr)
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{
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int in_quotes = 0;
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const int len = strlen(attr);
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while (*s) {
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while (*s) {
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if (!in_quotes && isspace(*s))
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break;
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in_quotes ^= *s == '"'; // XXX: support escaping?
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s++;
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}
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while (isspace(*s))
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s++;
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if (!av_strncasecmp(s, attr, len) && s[len] == '=')
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return s + len + 1 + (s[len + 1] == '"');
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}
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return NULL;
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}
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