| /* |
| * SubRip subtitle demuxer |
| * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> |
| * |
| * 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 |
| */ |
| |
| #include "avformat.h" |
| #include "internal.h" |
| #include "subtitles.h" |
| #include "libavutil/bprint.h" |
| #include "libavutil/intreadwrite.h" |
| |
| typedef struct { |
| FFDemuxSubtitlesQueue q; |
| } SRTContext; |
| |
| static int srt_probe(AVProbeData *p) |
| { |
| const unsigned char *ptr = p->buf; |
| int i, v, num = 0; |
| |
| if (AV_RB24(ptr) == 0xEFBBBF) |
| ptr += 3; /* skip UTF-8 BOM */ |
| |
| while (*ptr == '\r' || *ptr == '\n') |
| ptr++; |
| for (i=0; i<2; i++) { |
| if ((num == i || num + 1 == i) |
| && sscanf(ptr, "%*d:%*2d:%*2d%*1[,.]%*3d --> %*d:%*2d:%*2d%*1[,.]%3d", &v) == 1) |
| return AVPROBE_SCORE_MAX; |
| num = atoi(ptr); |
| ptr += ff_subtitles_next_line(ptr); |
| } |
| return 0; |
| } |
| |
| static int64_t get_pts(const char **buf, int *duration, |
| int32_t *x1, int32_t *y1, int32_t *x2, int32_t *y2) |
| { |
| int i; |
| |
| for (i=0; i<2; i++) { |
| int hh1, mm1, ss1, ms1; |
| int hh2, mm2, ss2, ms2; |
| if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d" |
| "%*[ ]X1:%u X2:%u Y1:%u Y2:%u", |
| &hh1, &mm1, &ss1, &ms1, |
| &hh2, &mm2, &ss2, &ms2, |
| x1, x2, y1, y2) >= 8) { |
| int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 1000LL + ms1; |
| int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 1000LL + ms2; |
| *duration = end - start; |
| *buf += ff_subtitles_next_line(*buf); |
| return start; |
| } |
| *buf += ff_subtitles_next_line(*buf); |
| } |
| return AV_NOPTS_VALUE; |
| } |
| |
| static int srt_read_header(AVFormatContext *s) |
| { |
| SRTContext *srt = s->priv_data; |
| AVBPrint buf; |
| AVStream *st = avformat_new_stream(s, NULL); |
| int res = 0; |
| |
| if (!st) |
| return AVERROR(ENOMEM); |
| avpriv_set_pts_info(st, 64, 1, 1000); |
| st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
| st->codec->codec_id = AV_CODEC_ID_SUBRIP; |
| |
| av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
| |
| while (!url_feof(s->pb)) { |
| ff_subtitles_read_chunk(s->pb, &buf); |
| |
| if (buf.len) { |
| int64_t pos = avio_tell(s->pb); |
| int64_t pts; |
| int duration; |
| const char *ptr = buf.str; |
| int32_t x1 = -1, y1 = -1, x2 = -1, y2 = -1; |
| AVPacket *sub; |
| |
| pts = get_pts(&ptr, &duration, &x1, &y1, &x2, &y2); |
| if (pts != AV_NOPTS_VALUE) { |
| int len = buf.len - (ptr - buf.str); |
| if (len <= 0) |
| continue; |
| sub = ff_subtitles_queue_insert(&srt->q, ptr, len, 0); |
| if (!sub) { |
| res = AVERROR(ENOMEM); |
| goto end; |
| } |
| sub->pos = pos; |
| sub->pts = pts; |
| sub->duration = duration; |
| if (x1 != -1) { |
| uint8_t *p = av_packet_new_side_data(sub, AV_PKT_DATA_SUBTITLE_POSITION, 16); |
| if (p) { |
| AV_WL32(p, x1); |
| AV_WL32(p + 4, y1); |
| AV_WL32(p + 8, x2); |
| AV_WL32(p + 12, y2); |
| } |
| } |
| } |
| } |
| } |
| |
| ff_subtitles_queue_finalize(&srt->q); |
| |
| end: |
| av_bprint_finalize(&buf, NULL); |
| return res; |
| } |
| |
| static int srt_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| SRTContext *srt = s->priv_data; |
| return ff_subtitles_queue_read_packet(&srt->q, pkt); |
| } |
| |
| static int srt_read_seek(AVFormatContext *s, int stream_index, |
| int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
| { |
| SRTContext *srt = s->priv_data; |
| return ff_subtitles_queue_seek(&srt->q, s, stream_index, |
| min_ts, ts, max_ts, flags); |
| } |
| |
| static int srt_read_close(AVFormatContext *s) |
| { |
| SRTContext *srt = s->priv_data; |
| ff_subtitles_queue_clean(&srt->q); |
| return 0; |
| } |
| |
| AVInputFormat ff_srt_demuxer = { |
| .name = "srt", |
| .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
| .priv_data_size = sizeof(SRTContext), |
| .read_probe = srt_probe, |
| .read_header = srt_read_header, |
| .read_packet = srt_read_packet, |
| .read_seek2 = srt_read_seek, |
| .read_close = srt_read_close, |
| }; |