mirror of
https://github.com/FFmpeg/FFmpeg.git
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426 lines
12 KiB
C
426 lines
12 KiB
C
/*
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* Copyright (c) 2012-2013 Clément Bœsch <u pkh me>
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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 "avio_internal.h"
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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void ff_text_init_avio(void *s, FFTextReader *r, AVIOContext *pb)
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{
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int i;
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r->pb = pb;
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r->buf_pos = r->buf_len = 0;
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r->type = FF_UTF_8;
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for (i = 0; i < 2; i++)
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r->buf[r->buf_len++] = avio_r8(r->pb);
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if (strncmp("\xFF\xFE", r->buf, 2) == 0) {
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r->type = FF_UTF16LE;
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r->buf_pos += 2;
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} else if (strncmp("\xFE\xFF", r->buf, 2) == 0) {
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r->type = FF_UTF16BE;
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r->buf_pos += 2;
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} else {
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r->buf[r->buf_len++] = avio_r8(r->pb);
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if (strncmp("\xEF\xBB\xBF", r->buf, 3) == 0) {
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// UTF8
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r->buf_pos += 3;
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}
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}
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if (s && (r->type == FF_UTF16LE || r->type == FF_UTF16BE))
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av_log(s, AV_LOG_INFO,
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"UTF16 is automatically converted to UTF8, do not specify a character encoding\n");
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}
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void ff_text_init_buf(FFTextReader *r, void *buf, size_t size)
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{
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memset(&r->buf_pb, 0, sizeof(r->buf_pb));
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ffio_init_context(&r->buf_pb, buf, size, 0, NULL, NULL, NULL, NULL);
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ff_text_init_avio(NULL, r, &r->buf_pb);
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}
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int64_t ff_text_pos(FFTextReader *r)
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{
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return avio_tell(r->pb) - r->buf_len + r->buf_pos;
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}
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int ff_text_r8(FFTextReader *r)
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{
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uint32_t val;
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uint8_t tmp;
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if (r->buf_pos < r->buf_len)
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return r->buf[r->buf_pos++];
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if (r->type == FF_UTF16LE) {
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GET_UTF16(val, avio_rl16(r->pb), return 0;)
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} else if (r->type == FF_UTF16BE) {
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GET_UTF16(val, avio_rb16(r->pb), return 0;)
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} else {
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return avio_r8(r->pb);
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}
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if (!val)
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return 0;
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r->buf_pos = 0;
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r->buf_len = 0;
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PUT_UTF8(val, tmp, r->buf[r->buf_len++] = tmp;)
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return r->buf[r->buf_pos++]; // buf_len is at least 1
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}
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void ff_text_read(FFTextReader *r, char *buf, size_t size)
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{
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for ( ; size > 0; size--)
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*buf++ = ff_text_r8(r);
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}
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int ff_text_eof(FFTextReader *r)
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{
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return r->buf_pos >= r->buf_len && avio_feof(r->pb);
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}
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int ff_text_peek_r8(FFTextReader *r)
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{
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int c;
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if (r->buf_pos < r->buf_len)
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return r->buf[r->buf_pos];
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c = ff_text_r8(r);
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if (!avio_feof(r->pb)) {
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r->buf_pos = 0;
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r->buf_len = 1;
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r->buf[0] = c;
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}
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return c;
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}
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AVPacket *ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q,
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const uint8_t *event, size_t 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->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_ts_pos(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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return FFDIFFSIGN(s1->pos, s2->pos);
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return FFDIFFSIGN(s1->pts , s2->pts);
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}
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static int cmp_pkt_sub_pos_ts(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->pos == s2->pos) {
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if (s1->pts == s2->pts)
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return 0;
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return s1->pts > s2->pts ? 1 : -1;
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}
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return s1->pos > s2->pos ? 1 : -1;
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}
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static void drop_dups(void *log_ctx, FFDemuxSubtitlesQueue *q)
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{
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int i, drop = 0;
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for (i = 1; i < q->nb_subs; i++) {
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const int last_id = i - 1 - drop;
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const AVPacket *last = &q->subs[last_id];
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if (q->subs[i].pts == last->pts &&
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q->subs[i].duration == last->duration &&
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q->subs[i].stream_index == last->stream_index &&
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!strcmp(q->subs[i].data, last->data)) {
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av_packet_unref(&q->subs[i]);
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drop++;
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} else if (drop) {
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q->subs[last_id + 1] = q->subs[i];
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memset(&q->subs[i], 0, sizeof(q->subs[i])); // for safety
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}
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}
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if (drop) {
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q->nb_subs -= drop;
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av_log(log_ctx, AV_LOG_WARNING, "Dropping %d duplicated subtitle events\n", drop);
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}
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}
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void ff_subtitles_queue_finalize(void *log_ctx, 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),
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q->sort == SUB_SORT_TS_POS ? cmp_pkt_sub_ts_pos
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: cmp_pkt_sub_pos_ts);
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for (i = 0; i < q->nb_subs; i++)
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if (q->subs[i].duration < 0 && 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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if (!q->keep_duplicates)
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drop_dups(log_ctx, q);
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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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if (av_packet_ref(pkt, sub) < 0) {
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return AVERROR(ENOMEM);
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}
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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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static int search_sub_ts(const FFDemuxSubtitlesQueue *q, int64_t ts)
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{
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int s1 = 0, s2 = q->nb_subs - 1;
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if (s2 < s1)
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return AVERROR(ERANGE);
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for (;;) {
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int mid;
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if (s1 == s2)
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return s1;
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if (s1 == s2 - 1)
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return q->subs[s1].pts <= q->subs[s2].pts ? s1 : s2;
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mid = (s1 + s2) / 2;
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if (q->subs[mid].pts <= ts)
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s1 = mid;
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else
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s2 = mid;
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}
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}
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int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int stream_index,
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int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
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{
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if (flags & AVSEEK_FLAG_BYTE) {
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return AVERROR(ENOSYS);
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} else if (flags & AVSEEK_FLAG_FRAME) {
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if (ts < 0 || ts >= q->nb_subs)
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return AVERROR(ERANGE);
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q->current_sub_idx = ts;
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} else {
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int i, idx = search_sub_ts(q, ts);
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int64_t ts_selected;
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if (idx < 0)
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return idx;
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for (i = idx; i < q->nb_subs && q->subs[i].pts < min_ts; i++)
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if (stream_index == -1 || q->subs[i].stream_index == stream_index)
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idx = i;
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for (i = idx; i > 0 && q->subs[i].pts > max_ts; i--)
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if (stream_index == -1 || q->subs[i].stream_index == stream_index)
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idx = i;
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ts_selected = q->subs[idx].pts;
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if (ts_selected < min_ts || ts_selected > max_ts)
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return AVERROR(ERANGE);
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/* look back in the latest subtitles for overlapping subtitles */
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for (i = idx - 1; i >= 0; i--) {
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int64_t pts = q->subs[i].pts;
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if (q->subs[i].duration <= 0 ||
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(stream_index != -1 && q->subs[i].stream_index != stream_index))
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continue;
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if (pts >= min_ts && pts > ts_selected - q->subs[i].duration)
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idx = i;
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else
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break;
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}
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/* If the queue is used to store multiple subtitles streams (like with
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* VobSub) and the stream index is not specified, we need to make sure
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* to focus on the smallest file position offset for a same timestamp;
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* queue is ordered by pts and then filepos, so we can take the first
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* entry for a given timestamp. */
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if (stream_index == -1)
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while (idx > 0 && q->subs[idx - 1].pts == q->subs[idx].pts)
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idx--;
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q->current_sub_idx = idx;
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}
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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_packet_unref(&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_text_chunk(FFTextReader *tr, 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 = ff_text_r8(tr);
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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 = ff_text_r8(tr);
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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 size_t len = strlen(attr);
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while (*s) {
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while (*s) {
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if (!in_quotes && av_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 (av_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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static inline int is_eol(char c)
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{
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return c == '\r' || c == '\n';
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}
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void ff_subtitles_read_text_chunk(FFTextReader *tr, AVBPrint *buf)
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{
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char eol_buf[5], last_was_cr = 0;
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int n = 0, i = 0, nb_eol = 0;
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av_bprint_clear(buf);
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for (;;) {
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char c = ff_text_r8(tr);
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if (!c)
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break;
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/* ignore all initial line breaks */
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if (n == 0 && is_eol(c))
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continue;
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/* line break buffering: we don't want to add the trailing \r\n */
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if (is_eol(c)) {
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nb_eol += c == '\n' || last_was_cr;
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if (nb_eol == 2)
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break;
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eol_buf[i++] = c;
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if (i == sizeof(eol_buf) - 1)
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break;
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last_was_cr = c == '\r';
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continue;
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}
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/* only one line break followed by data: we flush the line breaks
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* buffer */
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if (i) {
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eol_buf[i] = 0;
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av_bprintf(buf, "%s", eol_buf);
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i = nb_eol = 0;
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}
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av_bprint_chars(buf, c, 1);
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n++;
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}
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}
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void ff_subtitles_read_chunk(AVIOContext *pb, AVBPrint *buf)
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{
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FFTextReader tr;
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tr.buf_pos = tr.buf_len = 0;
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tr.type = 0;
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tr.pb = pb;
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ff_subtitles_read_text_chunk(&tr, buf);
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}
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ptrdiff_t ff_subtitles_read_line(FFTextReader *tr, char *buf, size_t size)
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{
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size_t cur = 0;
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if (!size)
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return 0;
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while (cur + 1 < size) {
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unsigned char c = ff_text_r8(tr);
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if (!c)
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return ff_text_eof(tr) ? cur : AVERROR_INVALIDDATA;
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if (c == '\r' || c == '\n')
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break;
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buf[cur++] = c;
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buf[cur] = '\0';
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}
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while (ff_text_peek_r8(tr) == '\r')
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ff_text_r8(tr);
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if (ff_text_peek_r8(tr) == '\n')
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ff_text_r8(tr);
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return cur;
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}
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