diff options
Diffstat (limited to 'libavformat/mpl2dec.c')
| -rw-r--r-- | libavformat/mpl2dec.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/libavformat/mpl2dec.c b/libavformat/mpl2dec.c new file mode 100644 index 0000000..17b302d --- /dev/null +++ b/libavformat/mpl2dec.c @@ -0,0 +1,146 @@ +/* + * Copyright (c) 2012 Clément Bœsch + * + * 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 + */ + +/** + * @file + * MPL2 subtitles format demuxer + */ + +#include "avformat.h" +#include "internal.h" +#include "subtitles.h" + +typedef struct { + FFDemuxSubtitlesQueue q; +} MPL2Context; + +static int mpl2_probe(AVProbeData *p) +{ + int i; + char c; + int64_t start, end; + const unsigned char *ptr = p->buf; + const unsigned char *ptr_end = ptr + p->buf_size; + + for (i = 0; i < 2; i++) { + if (sscanf(ptr, "[%"SCNd64"][%"SCNd64"]%c", &start, &end, &c) != 3 && + sscanf(ptr, "[%"SCNd64"][]%c", &start, &c) != 2) + return 0; + ptr += ff_subtitles_next_line(ptr); + if (ptr >= ptr_end) + return 0; + } + return AVPROBE_SCORE_MAX; +} + +static int read_ts(char **line, int64_t *pts_start, int *duration) +{ + char c; + int len; + int64_t end; + + if (sscanf(*line, "[%"SCNd64"][]%c%n", + pts_start, &c, &len) >= 2) { + *duration = -1; + *line += len - 1; + return 0; + } + if (sscanf(*line, "[%"SCNd64"][%"SCNd64"]%c%n", + pts_start, &end, &c, &len) >= 3) { + *duration = end - *pts_start; + *line += len - 1; + return 0; + } + return -1; +} + +static int mpl2_read_header(AVFormatContext *s) +{ + MPL2Context *mpl2 = s->priv_data; + AVStream *st = avformat_new_stream(s, NULL); + int res = 0; + + if (!st) + return AVERROR(ENOMEM); + avpriv_set_pts_info(st, 64, 1, 10); + st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; + st->codec->codec_id = AV_CODEC_ID_MPL2; + + while (!url_feof(s->pb)) { + char line[4096]; + char *p = line; + const int64_t pos = avio_tell(s->pb); + int len = ff_get_line(s->pb, line, sizeof(line)); + int64_t pts_start; + int duration; + + if (!len) + break; + + line[strcspn(line, "\r\n")] = 0; + + if (!read_ts(&p, &pts_start, &duration)) { + AVPacket *sub; + + sub = ff_subtitles_queue_insert(&mpl2->q, p, strlen(p), 0); + if (!sub) + return AVERROR(ENOMEM); + sub->pos = pos; + sub->pts = pts_start; + sub->duration = duration; + } + } + + ff_subtitles_queue_finalize(&mpl2->q); + return res; +} + +static int mpl2_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + MPL2Context *mpl2 = s->priv_data; + return ff_subtitles_queue_read_packet(&mpl2->q, pkt); +} + +static int mpl2_read_seek(AVFormatContext *s, int stream_index, + int64_t min_ts, int64_t ts, int64_t max_ts, int flags) +{ + MPL2Context *mpl2 = s->priv_data; + return ff_subtitles_queue_seek(&mpl2->q, s, stream_index, + min_ts, ts, max_ts, flags); +} + +static int mpl2_read_close(AVFormatContext *s) +{ + MPL2Context *mpl2 = s->priv_data; + ff_subtitles_queue_clean(&mpl2->q); + return 0; +} + +AVInputFormat ff_mpl2_demuxer = { + .name = "mpl2", + .long_name = NULL_IF_CONFIG_SMALL("MPL2 subtitles"), + .priv_data_size = sizeof(MPL2Context), + .read_probe = mpl2_probe, + .read_header = mpl2_read_header, + .read_packet = mpl2_read_packet, + .read_seek2 = mpl2_read_seek, + .read_close = mpl2_read_close, + .extensions = "txt,mpl2", +}; |
