/* * Copyright (c) 2012-2013 Clément Bœsch <u pkh me> * * 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 "avformat.h" #include "subtitles.h" #include "avio_internal.h" #include "libavutil/avassert.h" #include "libavutil/avstring.h" void ff_text_init_avio(FFTextReader *r, AVIOContext *pb) { int i; r->pb = pb; r->buf_pos = r->buf_len = 0; r->type = FF_UTF_8; for (i = 0; i < 2; i++) r->buf[r->buf_len++] = avio_r8(r->pb); if (strncmp("\xFF\xFE", r->buf, 2) == 0) { r->type = FF_UTF16LE; r->buf_pos += 2; } else if (strncmp("\xFE\xFF", r->buf, 2) == 0) { r->type = FF_UTF16BE; r->buf_pos += 2; } else { r->buf[r->buf_len++] = avio_r8(r->pb); if (strncmp("\xEF\xBB\xBF", r->buf, 3) == 0) { // UTF8 r->buf_pos += 3; } } } void ff_text_init_buf(FFTextReader *r, void *buf, size_t size) { memset(&r->buf_pb, 0, sizeof(r->buf_pb)); ffio_init_context(&r->buf_pb, buf, size, 0, NULL, NULL, NULL, NULL); ff_text_init_avio(r, &r->buf_pb); } int64_t ff_text_pos(FFTextReader *r) { return avio_tell(r->pb) - r->buf_len + r->buf_pos; } int ff_text_r8(FFTextReader *r) { uint32_t val; uint8_t tmp; if (r->buf_pos < r->buf_len) return r->buf[r->buf_pos++]; if (r->type == FF_UTF16LE) { GET_UTF16(val, avio_rl16(r->pb), return 0;) } else if (r->type == FF_UTF16BE) { GET_UTF16(val, avio_rb16(r->pb), return 0;) } else { return avio_r8(r->pb); } if (!val) return 0; r->buf_pos = 0; r->buf_len = 0; PUT_UTF8(val, tmp, r->buf[r->buf_len++] = tmp;) return r->buf[r->buf_pos++]; // buf_len is at least 1 } void ff_text_read(FFTextReader *r, char *buf, size_t size) { for ( ; size > 0; size--) *buf++ = ff_text_r8(r); } int ff_text_eof(FFTextReader *r) { return r->buf_pos >= r->buf_len && avio_feof(r->pb); } int ff_text_peek_r8(FFTextReader *r) { int c; if (r->buf_pos < r->buf_len) return r->buf[r->buf_pos]; c = ff_text_r8(r); if (!avio_feof(r->pb)) { r->buf_pos = 0; r->buf_len = 1; r->buf[0] = c; } return c; } AVPacket *ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q, const uint8_t *event, int len, int merge) { AVPacket *subs, *sub; if (merge && q->nb_subs > 0) { /* merge with previous event */ int old_len; sub = &q->subs[q->nb_subs - 1]; old_len = sub->size; if (av_grow_packet(sub, len) < 0) return NULL; memcpy(sub->data + old_len, event, len); } else { /* new event */ if (q->nb_subs >= INT_MAX/sizeof(*q->subs) - 1) return NULL; subs = av_fast_realloc(q->subs, &q->allocated_size, (q->nb_subs + 1) * sizeof(*q->subs)); if (!subs) return NULL; q->subs = subs; sub = &subs[q->nb_subs++]; if (av_new_packet(sub, len) < 0) return NULL; sub->flags |= AV_PKT_FLAG_KEY; sub->pts = sub->dts = 0; memcpy(sub->data, event, len); } return sub; } static int cmp_pkt_sub_ts_pos(const void *a, const void *b) { const AVPacket *s1 = a; const AVPacket *s2 = b; if (s1->pts == s2->pts) { if (s1->pos == s2->pos) return 0; return s1->pos > s2->pos ? 1 : -1; } return s1->pts > s2->pts ? 1 : -1; } static int cmp_pkt_sub_pos_ts(const void *a, const void *b) { const AVPacket *s1 = a; const AVPacket *s2 = b; if (s1->pos == s2->pos) { if (s1->pts == s2->pts) return 0; return s1->pts > s2->pts ? 1 : -1; } return s1->pos > s2->pos ? 1 : -1; } void ff_subtitles_queue_finalize(FFDemuxSubtitlesQueue *q) { int i; qsort(q->subs, q->nb_subs, sizeof(*q->subs), q->sort == SUB_SORT_TS_POS ? cmp_pkt_sub_ts_pos : cmp_pkt_sub_pos_ts); for (i = 0; i < q->nb_subs; i++) if (q->subs[i].duration == -1 && i < q->nb_subs - 1) q->subs[i].duration = q->subs[i + 1].pts - q->subs[i].pts; } int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt) { AVPacket *sub = q->subs + q->current_sub_idx; if (q->current_sub_idx == q->nb_subs) return AVERROR_EOF; if (av_copy_packet(pkt, sub) < 0) { return AVERROR(ENOMEM); } pkt->dts = pkt->pts; q->current_sub_idx++; return 0; } static int search_sub_ts(const FFDemuxSubtitlesQueue *q, int64_t ts) { int s1 = 0, s2 = q->nb_subs - 1; if (s2 < s1) return AVERROR(ERANGE); for (;;) { int mid; if (s1 == s2) return s1; if (s1 == s2 - 1) return q->subs[s1].pts <= q->subs[s2].pts ? s1 : s2; mid = (s1 + s2) / 2; if (q->subs[mid].pts <= ts) s1 = mid; else s2 = mid; } } int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags) { if (flags & AVSEEK_FLAG_BYTE) { return AVERROR(ENOSYS); } else if (flags & AVSEEK_FLAG_FRAME) { if (ts < 0 || ts >= q->nb_subs) return AVERROR(ERANGE); q->current_sub_idx = ts; } else { int i, idx = search_sub_ts(q, ts); int64_t ts_selected; if (idx < 0) return idx; for (i = idx; i < q->nb_subs && q->subs[i].pts < min_ts; i++) if (stream_index == -1 || q->subs[i].stream_index == stream_index) idx = i; for (i = idx; i > 0 && q->subs[i].pts > max_ts; i--) if (stream_index == -1 || q->subs[i].stream_index == stream_index) idx = i; ts_selected = q->subs[idx].pts; if (ts_selected < min_ts || ts_selected > max_ts) return AVERROR(ERANGE); /* look back in the latest subtitles for overlapping subtitles */ for (i = idx - 1; i >= 0; i--) { int64_t pts = q->subs[i].pts; if (q->subs[i].duration <= 0 || (stream_index != -1 && q->subs[i].stream_index != stream_index)) continue; if (pts >= min_ts && pts > ts_selected - q->subs[i].duration) idx = i; else break; } /* If the queue is used to store multiple subtitles streams (like with * VobSub) and the stream index is not specified, we need to make sure * to focus on the smallest file position offset for a same timestamp; * queue is ordered by pts and then filepos, so we can take the first * entry for a given timestamp. */ if (stream_index == -1) while (idx > 0 && q->subs[idx - 1].pts == q->subs[idx].pts) idx--; q->current_sub_idx = idx; } return 0; } void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q) { int i; for (i = 0; i < q->nb_subs; i++) av_free_packet(&q->subs[i]); av_freep(&q->subs); q->nb_subs = q->allocated_size = q->current_sub_idx = 0; } int ff_smil_extract_next_text_chunk(FFTextReader *tr, AVBPrint *buf, char *c) { int i = 0; char end_chr; if (!*c) // cached char? *c = ff_text_r8(tr); if (!*c) return 0; end_chr = *c == '<' ? '>' : '<'; do { av_bprint_chars(buf, *c, 1); *c = ff_text_r8(tr); i++; } while (*c != end_chr && *c); if (end_chr == '>') { av_bprint_chars(buf, '>', 1); *c = 0; } return i; } const char *ff_smil_get_attr_ptr(const char *s, const char *attr) { int in_quotes = 0; const int len = strlen(attr); while (*s) { while (*s) { if (!in_quotes && av_isspace(*s)) break; in_quotes ^= *s == '"'; // XXX: support escaping? s++; } while (av_isspace(*s)) s++; if (!av_strncasecmp(s, attr, len) && s[len] == '=') return s + len + 1 + (s[len + 1] == '"'); } return NULL; } static inline int is_eol(char c) { return c == '\r' || c == '\n'; } void ff_subtitles_read_text_chunk(FFTextReader *tr, AVBPrint *buf) { char eol_buf[5], last_was_cr = 0; int n = 0, i = 0, nb_eol = 0; av_bprint_clear(buf); for (;;) { char c = ff_text_r8(tr); if (!c) break; /* ignore all initial line breaks */ if (n == 0 && is_eol(c)) continue; /* line break buffering: we don't want to add the trailing \r\n */ if (is_eol(c)) { nb_eol += c == '\n' || last_was_cr; if (nb_eol == 2) break; eol_buf[i++] = c; if (i == sizeof(eol_buf) - 1) break; last_was_cr = c == '\r'; continue; } /* only one line break followed by data: we flush the line breaks * buffer */ if (i) { eol_buf[i] = 0; av_bprintf(buf, "%s", eol_buf); i = nb_eol = 0; } av_bprint_chars(buf, c, 1); n++; } } void ff_subtitles_read_chunk(AVIOContext *pb, AVBPrint *buf) { FFTextReader tr; tr.buf_pos = tr.buf_len = 0; tr.type = 0; tr.pb = pb; ff_subtitles_read_text_chunk(&tr, buf); } ptrdiff_t ff_subtitles_read_line(FFTextReader *tr, char *buf, size_t size) { size_t cur = 0; if (!size) return 0; while (cur + 1 < size) { unsigned char c = ff_text_r8(tr); if (!c) return ff_text_eof(tr) ? cur : AVERROR_INVALIDDATA; if (c == '\r' || c == '\n') break; buf[cur++] = c; buf[cur] = '\0'; } if (ff_text_peek_r8(tr) == '\r') ff_text_r8(tr); if (ff_text_peek_r8(tr) == '\n') ff_text_r8(tr); return cur; }