2 * Copyright (c) 2012-2013 Clément Bœsch <u pkh me>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "subtitles.h"
23 #include "libavutil/avassert.h"
24 #include "libavutil/avstring.h"
26 AVPacket *ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q,
27 const uint8_t *event, int len, int merge)
31 if (merge && q->nb_subs > 0) {
32 /* merge with previous event */
35 sub = &q->subs[q->nb_subs - 1];
37 if (av_grow_packet(sub, len) < 0)
39 memcpy(sub->data + old_len, event, len);
43 if (q->nb_subs >= INT_MAX/sizeof(*q->subs) - 1)
45 subs = av_fast_realloc(q->subs, &q->allocated_size,
46 (q->nb_subs + 1) * sizeof(*q->subs));
50 sub = &subs[q->nb_subs++];
51 if (av_new_packet(sub, len) < 0)
53 sub->flags |= AV_PKT_FLAG_KEY;
54 sub->pts = sub->dts = 0;
55 memcpy(sub->data, event, len);
60 static int cmp_pkt_sub_ts_pos(const void *a, const void *b)
62 const AVPacket *s1 = a;
63 const AVPacket *s2 = b;
64 if (s1->pts == s2->pts) {
65 if (s1->pos == s2->pos)
67 return s1->pos > s2->pos ? 1 : -1;
69 return s1->pts > s2->pts ? 1 : -1;
72 static int cmp_pkt_sub_pos_ts(const void *a, const void *b)
74 const AVPacket *s1 = a;
75 const AVPacket *s2 = b;
76 if (s1->pos == s2->pos) {
77 if (s1->pts == s2->pts)
79 return s1->pts > s2->pts ? 1 : -1;
81 return s1->pos > s2->pos ? 1 : -1;
84 void ff_subtitles_queue_finalize(FFDemuxSubtitlesQueue *q)
88 qsort(q->subs, q->nb_subs, sizeof(*q->subs),
89 q->sort == SUB_SORT_TS_POS ? cmp_pkt_sub_ts_pos
90 : cmp_pkt_sub_pos_ts);
91 for (i = 0; i < q->nb_subs; i++)
92 if (q->subs[i].duration == -1 && i < q->nb_subs - 1)
93 q->subs[i].duration = q->subs[i + 1].pts - q->subs[i].pts;
96 int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
98 AVPacket *sub = q->subs + q->current_sub_idx;
100 if (q->current_sub_idx == q->nb_subs)
102 if (av_copy_packet(pkt, sub) < 0) {
103 return AVERROR(ENOMEM);
107 q->current_sub_idx++;
111 static int search_sub_ts(const FFDemuxSubtitlesQueue *q, int64_t ts)
113 int s1 = 0, s2 = q->nb_subs - 1;
116 return AVERROR(ERANGE);
124 return q->subs[s1].pts <= q->subs[s2].pts ? s1 : s2;
126 if (q->subs[mid].pts <= ts)
133 int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int stream_index,
134 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
136 if (flags & AVSEEK_FLAG_BYTE) {
137 return AVERROR(ENOSYS);
138 } else if (flags & AVSEEK_FLAG_FRAME) {
139 if (ts < 0 || ts >= q->nb_subs)
140 return AVERROR(ERANGE);
141 q->current_sub_idx = ts;
143 int i, idx = search_sub_ts(q, ts);
148 for (i = idx; i < q->nb_subs && q->subs[i].pts < min_ts; i++)
149 if (stream_index == -1 || q->subs[i].stream_index == stream_index)
151 for (i = idx; i > 0 && q->subs[i].pts > max_ts; i--)
152 if (stream_index == -1 || q->subs[i].stream_index == stream_index)
155 ts_selected = q->subs[idx].pts;
156 if (ts_selected < min_ts || ts_selected > max_ts)
157 return AVERROR(ERANGE);
159 /* look back in the latest subtitles for overlapping subtitles */
160 for (i = idx - 1; i >= 0; i--) {
161 int64_t pts = q->subs[i].pts;
162 if (q->subs[i].duration <= 0 ||
163 (stream_index != -1 && q->subs[i].stream_index != stream_index))
165 if (pts >= min_ts && pts > ts_selected - q->subs[i].duration)
171 /* If the queue is used to store multiple subtitles streams (like with
172 * VobSub) and the stream index is not specified, we need to make sure
173 * to focus on the smallest file position offset for a same timestamp;
174 * queue is ordered by pts and then filepos, so we can take the first
175 * entry for a given timestamp. */
176 if (stream_index == -1)
177 while (idx > 0 && q->subs[idx - 1].pts == q->subs[idx].pts)
180 q->current_sub_idx = idx;
185 void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
189 for (i = 0; i < q->nb_subs; i++)
190 av_free_packet(&q->subs[i]);
192 q->nb_subs = q->allocated_size = q->current_sub_idx = 0;
195 int ff_smil_extract_next_chunk(AVIOContext *pb, AVBPrint *buf, char *c)
200 if (!*c) // cached char?
205 end_chr = *c == '<' ? '>' : '<';
207 av_bprint_chars(buf, *c, 1);
210 } while (*c != end_chr && *c);
211 if (end_chr == '>') {
212 av_bprint_chars(buf, '>', 1);
218 const char *ff_smil_get_attr_ptr(const char *s, const char *attr)
221 const int len = strlen(attr);
225 if (!in_quotes && av_isspace(*s))
227 in_quotes ^= *s == '"'; // XXX: support escaping?
230 while (av_isspace(*s))
232 if (!av_strncasecmp(s, attr, len) && s[len] == '=')
233 return s + len + 1 + (s[len + 1] == '"');
238 static inline int is_eol(char c)
240 return c == '\r' || c == '\n';
243 void ff_subtitles_read_chunk(AVIOContext *pb, AVBPrint *buf)
245 char eol_buf[5], last_was_cr = 0;
246 int n = 0, i = 0, nb_eol = 0;
248 av_bprint_clear(buf);
251 char c = avio_r8(pb);
256 /* ignore all initial line breaks */
257 if (n == 0 && is_eol(c))
260 /* line break buffering: we don't want to add the trailing \r\n */
262 nb_eol += c == '\n' || last_was_cr;
266 if (i == sizeof(eol_buf) - 1)
268 last_was_cr = c == '\r';
272 /* only one line break followed by data: we flush the line breaks
276 av_bprintf(buf, "%s", eol_buf);
280 av_bprint_chars(buf, c, 1);