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![Derek Buitenhuis](/assets/img/avatar_default.png)
* commit '9200514ad8717c63f82101dc394f4378854325bf': lavf: replace AVStream.codec with AVStream.codecpar This has been a HUGE effort from: - Derek Buitenhuis <derek.buitenhuis@gmail.com> - Hendrik Leppkes <h.leppkes@gmail.com> - wm4 <nfxjfg@googlemail.com> - Clément Bœsch <clement@stupeflix.com> - James Almer <jamrial@gmail.com> - Michael Niedermayer <michael@niedermayer.cc> - Rostislav Pehlivanov <atomnuker@gmail.com> Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
193 lines
5.4 KiB
C
193 lines
5.4 KiB
C
/*
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* SSA/ASS demuxer
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* Copyright (c) 2008 Michael Niedermayer
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* Copyright (c) 2014 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 <stdint.h>
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#include "avformat.h"
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#include "internal.h"
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#include "subtitles.h"
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#include "libavcodec/internal.h"
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#include "libavutil/bprint.h"
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typedef struct ASSContext {
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FFDemuxSubtitlesQueue q;
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unsigned readorder;
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} ASSContext;
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static int ass_probe(AVProbeData *p)
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{
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char buf[13];
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FFTextReader tr;
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ff_text_init_buf(&tr, p->buf, p->buf_size);
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while (ff_text_peek_r8(&tr) == '\r' || ff_text_peek_r8(&tr) == '\n')
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ff_text_r8(&tr);
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ff_text_read(&tr, buf, sizeof(buf));
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if (!memcmp(buf, "[Script Info]", 13))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int ass_read_close(AVFormatContext *s)
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{
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ASSContext *ass = s->priv_data;
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ff_subtitles_queue_clean(&ass->q);
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return 0;
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}
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static int read_dialogue(ASSContext *ass, AVBPrint *dst, const uint8_t *p,
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int64_t *start, int *duration)
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{
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int pos = 0;
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int64_t end;
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int hh1, mm1, ss1, ms1;
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int hh2, mm2, ss2, ms2;
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if (sscanf(p, "Dialogue: %*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d,%n",
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&hh1, &mm1, &ss1, &ms1,
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&hh2, &mm2, &ss2, &ms2, &pos) >= 8 && pos > 0) {
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/* This is not part of the sscanf itself in order to handle an actual
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* number (which would be the Layer) or the form "Marked=N" (which is
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* the old SSA field, now replaced by Layer, and will lead to Layer
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* being 0 here). */
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const int layer = atoi(p + 10);
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end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
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*start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
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*duration = end - *start;
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av_bprint_clear(dst);
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av_bprintf(dst, "%u,%d,%s", ass->readorder++, layer, p + pos);
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/* right strip the buffer */
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while (dst->len > 0 &&
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dst->str[dst->len - 1] == '\r' ||
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dst->str[dst->len - 1] == '\n')
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dst->str[--dst->len] = 0;
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return 0;
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}
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return -1;
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}
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static int64_t get_line(AVBPrint *buf, FFTextReader *tr)
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{
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int64_t pos = ff_text_pos(tr);
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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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av_bprint_chars(buf, c, 1);
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if (c == '\n')
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break;
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}
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return pos;
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}
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static int ass_read_header(AVFormatContext *s)
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{
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ASSContext *ass = s->priv_data;
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AVBPrint header, line, rline;
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int res = 0;
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AVStream *st;
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FFTextReader tr;
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ff_text_init_avio(s, &tr, s->pb);
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 64, 1, 100);
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st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codecpar->codec_id = AV_CODEC_ID_ASS;
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av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
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av_bprint_init(&line, 0, AV_BPRINT_SIZE_UNLIMITED);
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av_bprint_init(&rline, 0, AV_BPRINT_SIZE_UNLIMITED);
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ass->q.keep_duplicates = 1;
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for (;;) {
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int64_t pos = get_line(&line, &tr);
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int64_t ts_start = AV_NOPTS_VALUE;
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int duration = -1;
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AVPacket *sub;
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if (!line.str[0]) // EOF
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break;
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if (read_dialogue(ass, &rline, line.str, &ts_start, &duration) < 0) {
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av_bprintf(&header, "%s", line.str);
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continue;
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}
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sub = ff_subtitles_queue_insert(&ass->q, rline.str, rline.len, 0);
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if (!sub) {
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res = AVERROR(ENOMEM);
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goto end;
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}
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sub->pos = pos;
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sub->pts = ts_start;
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sub->duration = duration;
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}
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res = ff_bprint_to_codecpar_extradata(st->codecpar, &header);
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if (res < 0)
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goto end;
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ff_subtitles_queue_finalize(s, &ass->q);
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end:
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av_bprint_finalize(&header, NULL);
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av_bprint_finalize(&line, NULL);
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av_bprint_finalize(&rline, NULL);
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return res;
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}
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static int ass_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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ASSContext *ass = s->priv_data;
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return ff_subtitles_queue_read_packet(&ass->q, pkt);
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}
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static int ass_read_seek(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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ASSContext *ass = s->priv_data;
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return ff_subtitles_queue_seek(&ass->q, s, stream_index,
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min_ts, ts, max_ts, flags);
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}
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AVInputFormat ff_ass_demuxer = {
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.name = "ass",
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.long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
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.priv_data_size = sizeof(ASSContext),
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.read_probe = ass_probe,
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.read_header = ass_read_header,
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.read_packet = ass_read_packet,
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.read_close = ass_read_close,
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.read_seek2 = ass_read_seek,
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};
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