yading@11: /*
yading@11:  * Copyright (c) 2012 Clément Bœsch
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * MPL2 subtitles format demuxer
yading@11:  */
yading@11: 
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "subtitles.h"
yading@11: 
yading@11: typedef struct {
yading@11:     FFDemuxSubtitlesQueue q;
yading@11: } MPL2Context;
yading@11: 
yading@11: static int mpl2_probe(AVProbeData *p)
yading@11: {
yading@11:     int i;
yading@11:     char c;
yading@11:     int64_t start, end;
yading@11:     const unsigned char *ptr = p->buf;
yading@11:     const unsigned char *ptr_end = ptr + p->buf_size;
yading@11: 
yading@11:     for (i = 0; i < 2; i++) {
yading@11:         if (sscanf(ptr, "[%"SCNd64"][%"SCNd64"]%c", &start, &end, &c) != 3 &&
yading@11:             sscanf(ptr, "[%"SCNd64"][]%c",          &start,       &c) != 2)
yading@11:             return 0;
yading@11:         ptr += strcspn(ptr, "\r\n") + 1;
yading@11:         if (ptr >= ptr_end)
yading@11:             return 0;
yading@11:     }
yading@11:     return AVPROBE_SCORE_MAX;
yading@11: }
yading@11: 
yading@11: static int read_ts(char **line, int64_t *pts_start, int *duration)
yading@11: {
yading@11:     char c;
yading@11:     int len;
yading@11:     int64_t end;
yading@11: 
yading@11:     if (sscanf(*line, "[%"SCNd64"][]%c%n",
yading@11:                pts_start, &c, &len) >= 2) {
yading@11:         *duration = -1;
yading@11:         *line += len - 1;
yading@11:         return 0;
yading@11:     }
yading@11:     if (sscanf(*line, "[%"SCNd64"][%"SCNd64"]%c%n",
yading@11:                pts_start, &end, &c, &len) >= 3) {
yading@11:         *duration = end - *pts_start;
yading@11:         *line += len - 1;
yading@11:         return 0;
yading@11:     }
yading@11:     return -1;
yading@11: }
yading@11: 
yading@11: static int mpl2_read_header(AVFormatContext *s)
yading@11: {
yading@11:     MPL2Context *mpl2 = s->priv_data;
yading@11:     AVStream *st = avformat_new_stream(s, NULL);
yading@11:     int res = 0;
yading@11: 
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11:     avpriv_set_pts_info(st, 64, 1, 10);
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
yading@11:     st->codec->codec_id   = AV_CODEC_ID_MPL2;
yading@11: 
yading@11:     while (!url_feof(s->pb)) {
yading@11:         char line[4096];
yading@11:         char *p = line;
yading@11:         const int64_t pos = avio_tell(s->pb);
yading@11:         int len = ff_get_line(s->pb, line, sizeof(line));
yading@11:         int64_t pts_start;
yading@11:         int duration;
yading@11: 
yading@11:         if (!len)
yading@11:             break;
yading@11: 
yading@11:         line[strcspn(line, "\r\n")] = 0;
yading@11: 
yading@11:         if (!read_ts(&p, &pts_start, &duration)) {
yading@11:             AVPacket *sub;
yading@11: 
yading@11:             sub = ff_subtitles_queue_insert(&mpl2->q, p, strlen(p), 0);
yading@11:             if (!sub)
yading@11:                 return AVERROR(ENOMEM);
yading@11:             sub->pos = pos;
yading@11:             sub->pts = pts_start;
yading@11:             sub->duration = duration;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     ff_subtitles_queue_finalize(&mpl2->q);
yading@11:     return res;
yading@11: }
yading@11: 
yading@11: static int mpl2_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     MPL2Context *mpl2 = s->priv_data;
yading@11:     return ff_subtitles_queue_read_packet(&mpl2->q, pkt);
yading@11: }
yading@11: 
yading@11: static int mpl2_read_seek(AVFormatContext *s, int stream_index,
yading@11:                           int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
yading@11: {
yading@11:     MPL2Context *mpl2 = s->priv_data;
yading@11:     return ff_subtitles_queue_seek(&mpl2->q, s, stream_index,
yading@11:                                    min_ts, ts, max_ts, flags);
yading@11: }
yading@11: 
yading@11: static int mpl2_read_close(AVFormatContext *s)
yading@11: {
yading@11:     MPL2Context *mpl2 = s->priv_data;
yading@11:     ff_subtitles_queue_clean(&mpl2->q);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_mpl2_demuxer = {
yading@11:     .name           = "mpl2",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("MPL2 subtitles"),
yading@11:     .priv_data_size = sizeof(MPL2Context),
yading@11:     .read_probe     = mpl2_probe,
yading@11:     .read_header    = mpl2_read_header,
yading@11:     .read_packet    = mpl2_read_packet,
yading@11:     .read_seek2     = mpl2_read_seek,
yading@11:     .read_close     = mpl2_read_close,
yading@11:     .extensions     = "txt,mpl2",
yading@11: };