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:  * MPlayer 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: } MPSubContext;
yading@11: 
yading@11: static int mpsub_probe(AVProbeData *p)
yading@11: {
yading@11:     const char *ptr     = p->buf;
yading@11:     const char *ptr_end = p->buf + p->buf_size;
yading@11: 
yading@11:     while (ptr < ptr_end) {
yading@11:         int n;
yading@11: 
yading@11:         if (!memcmp(ptr, "FORMAT=TIME", 11) ||
yading@11:             sscanf(ptr, "FORMAT=%d", &n) == 1)
yading@11:             return AVPROBE_SCORE_MAX/2;
yading@11:         ptr += strcspn(ptr, "\n") + 1;
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int mpsub_read_header(AVFormatContext *s)
yading@11: {
yading@11:     MPSubContext *mpsub = s->priv_data;
yading@11:     AVStream *st;
yading@11:     AVBPrint buf;
yading@11:     AVRational pts_info = (AVRational){ 100, 1 }; // ts based by default
yading@11:     int res = 0;
yading@11:     float multiplier = 100.0;
yading@11:     float current_pts = 0;
yading@11: 
yading@11:     av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
yading@11: 
yading@11:     while (!url_feof(s->pb)) {
yading@11:         char line[1024];
yading@11:         float start, duration;
yading@11:         int fps, len = ff_get_line(s->pb, line, sizeof(line));
yading@11: 
yading@11:         if (!len)
yading@11:             break;
yading@11: 
yading@11:         line[strcspn(line, "\r\n")] = 0;
yading@11: 
yading@11:         if (sscanf(line, "FORMAT=%d", &fps) == 1 && fps > 3 && fps < 100) {
yading@11:             /* frame based timing */
yading@11:             pts_info = (AVRational){ fps, 1 };
yading@11:             multiplier = 1.0;
yading@11:         } else if (sscanf(line, "%f %f", &start, &duration) == 2) {
yading@11:             AVPacket *sub;
yading@11:             const int64_t pos = avio_tell(s->pb);
yading@11: 
yading@11:             ff_subtitles_read_chunk(s->pb, &buf);
yading@11:             if (buf.len) {
yading@11:                 sub = ff_subtitles_queue_insert(&mpsub->q, buf.str, buf.len, 0);
yading@11:                 if (!sub) {
yading@11:                     res = AVERROR(ENOMEM);
yading@11:                     goto end;
yading@11:                 }
yading@11:                 sub->pts = (int64_t)(current_pts + start*multiplier);
yading@11:                 sub->duration = (int)(duration * multiplier);
yading@11:                 current_pts += (start + duration) * multiplier;
yading@11:                 sub->pos = pos;
yading@11:             }
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11:     avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
yading@11:     st->codec->codec_id   = AV_CODEC_ID_TEXT;
yading@11: 
yading@11:     ff_subtitles_queue_finalize(&mpsub->q);
yading@11: 
yading@11: end:
yading@11:     av_bprint_finalize(&buf, NULL);
yading@11:     return res;
yading@11: }
yading@11: 
yading@11: static int mpsub_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     MPSubContext *mpsub = s->priv_data;
yading@11:     return ff_subtitles_queue_read_packet(&mpsub->q, pkt);
yading@11: }
yading@11: 
yading@11: static int mpsub_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:     MPSubContext *mpsub = s->priv_data;
yading@11:     return ff_subtitles_queue_seek(&mpsub->q, s, stream_index,
yading@11:                                    min_ts, ts, max_ts, flags);
yading@11: }
yading@11: 
yading@11: static int mpsub_read_close(AVFormatContext *s)
yading@11: {
yading@11:     MPSubContext *mpsub = s->priv_data;
yading@11:     ff_subtitles_queue_clean(&mpsub->q);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_mpsub_demuxer = {
yading@11:     .name           = "mpsub",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("MPlayer subtitles"),
yading@11:     .priv_data_size = sizeof(MPSubContext),
yading@11:     .read_probe     = mpsub_probe,
yading@11:     .read_header    = mpsub_read_header,
yading@11:     .read_packet    = mpsub_read_packet,
yading@11:     .read_seek2     = mpsub_read_seek,
yading@11:     .read_close     = mpsub_read_close,
yading@11:     .extensions     = "sub",
yading@11: };