| 1 | /* |
| 2 | * SubRip subtitle demuxer |
| 3 | * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "avformat.h" |
| 23 | #include "internal.h" |
| 24 | #include "subtitles.h" |
| 25 | #include "libavutil/bprint.h" |
| 26 | #include "libavutil/intreadwrite.h" |
| 27 | |
| 28 | typedef struct { |
| 29 | FFDemuxSubtitlesQueue q; |
| 30 | } SRTContext; |
| 31 | |
| 32 | static int srt_probe(AVProbeData *p) |
| 33 | { |
| 34 | int i, v, num = 0; |
| 35 | FFTextReader tr; |
| 36 | |
| 37 | ff_text_init_buf(&tr, p->buf, p->buf_size); |
| 38 | |
| 39 | while (ff_text_peek_r8(&tr) == '\r' || ff_text_peek_r8(&tr) == '\n') |
| 40 | ff_text_r8(&tr); |
| 41 | for (i=0; i<2; i++) { |
| 42 | char buf[128]; |
| 43 | if (ff_subtitles_read_line(&tr, buf, sizeof(buf)) < 0) |
| 44 | break; |
| 45 | if ((num == i || num + 1 == i) |
| 46 | && buf[0] >= '0' && buf[1] <= '9' && strstr(buf, " --> ") |
| 47 | && sscanf(buf, "%*d:%*2d:%*2d%*1[,.]%*3d --> %*d:%*2d:%*2d%*1[,.]%3d", &v) == 1) |
| 48 | return AVPROBE_SCORE_MAX; |
| 49 | num = atoi(buf); |
| 50 | } |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | static int64_t get_pts(const char **buf, int *duration, |
| 55 | int32_t *x1, int32_t *y1, int32_t *x2, int32_t *y2) |
| 56 | { |
| 57 | int i; |
| 58 | |
| 59 | for (i=0; i<2; i++) { |
| 60 | int hh1, mm1, ss1, ms1; |
| 61 | int hh2, mm2, ss2, ms2; |
| 62 | if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d" |
| 63 | "%*[ ]X1:%u X2:%u Y1:%u Y2:%u", |
| 64 | &hh1, &mm1, &ss1, &ms1, |
| 65 | &hh2, &mm2, &ss2, &ms2, |
| 66 | x1, x2, y1, y2) >= 8) { |
| 67 | int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 1000LL + ms1; |
| 68 | int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 1000LL + ms2; |
| 69 | *duration = end - start; |
| 70 | *buf += ff_subtitles_next_line(*buf); |
| 71 | return start; |
| 72 | } |
| 73 | *buf += ff_subtitles_next_line(*buf); |
| 74 | } |
| 75 | return AV_NOPTS_VALUE; |
| 76 | } |
| 77 | |
| 78 | static int srt_read_header(AVFormatContext *s) |
| 79 | { |
| 80 | SRTContext *srt = s->priv_data; |
| 81 | AVBPrint buf; |
| 82 | AVStream *st = avformat_new_stream(s, NULL); |
| 83 | int res = 0; |
| 84 | FFTextReader tr; |
| 85 | ff_text_init_avio(&tr, s->pb); |
| 86 | |
| 87 | if (!st) |
| 88 | return AVERROR(ENOMEM); |
| 89 | avpriv_set_pts_info(st, 64, 1, 1000); |
| 90 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
| 91 | st->codec->codec_id = AV_CODEC_ID_SUBRIP; |
| 92 | |
| 93 | av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
| 94 | |
| 95 | while (!ff_text_eof(&tr)) { |
| 96 | ff_subtitles_read_text_chunk(&tr, &buf); |
| 97 | |
| 98 | if (buf.len) { |
| 99 | int64_t pos = ff_text_pos(&tr); |
| 100 | int64_t pts; |
| 101 | int duration; |
| 102 | const char *ptr = buf.str; |
| 103 | int32_t x1 = -1, y1 = -1, x2 = -1, y2 = -1; |
| 104 | AVPacket *sub; |
| 105 | |
| 106 | pts = get_pts(&ptr, &duration, &x1, &y1, &x2, &y2); |
| 107 | if (pts != AV_NOPTS_VALUE) { |
| 108 | int len = buf.len - (ptr - buf.str); |
| 109 | if (len <= 0) |
| 110 | continue; |
| 111 | sub = ff_subtitles_queue_insert(&srt->q, ptr, len, 0); |
| 112 | if (!sub) { |
| 113 | res = AVERROR(ENOMEM); |
| 114 | goto end; |
| 115 | } |
| 116 | sub->pos = pos; |
| 117 | sub->pts = pts; |
| 118 | sub->duration = duration; |
| 119 | if (x1 != -1) { |
| 120 | uint8_t *p = av_packet_new_side_data(sub, AV_PKT_DATA_SUBTITLE_POSITION, 16); |
| 121 | if (p) { |
| 122 | AV_WL32(p, x1); |
| 123 | AV_WL32(p + 4, y1); |
| 124 | AV_WL32(p + 8, x2); |
| 125 | AV_WL32(p + 12, y2); |
| 126 | } |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | ff_subtitles_queue_finalize(&srt->q); |
| 133 | |
| 134 | end: |
| 135 | av_bprint_finalize(&buf, NULL); |
| 136 | return res; |
| 137 | } |
| 138 | |
| 139 | static int srt_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 140 | { |
| 141 | SRTContext *srt = s->priv_data; |
| 142 | return ff_subtitles_queue_read_packet(&srt->q, pkt); |
| 143 | } |
| 144 | |
| 145 | static int srt_read_seek(AVFormatContext *s, int stream_index, |
| 146 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
| 147 | { |
| 148 | SRTContext *srt = s->priv_data; |
| 149 | return ff_subtitles_queue_seek(&srt->q, s, stream_index, |
| 150 | min_ts, ts, max_ts, flags); |
| 151 | } |
| 152 | |
| 153 | static int srt_read_close(AVFormatContext *s) |
| 154 | { |
| 155 | SRTContext *srt = s->priv_data; |
| 156 | ff_subtitles_queue_clean(&srt->q); |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | AVInputFormat ff_srt_demuxer = { |
| 161 | .name = "srt", |
| 162 | .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
| 163 | .priv_data_size = sizeof(SRTContext), |
| 164 | .read_probe = srt_probe, |
| 165 | .read_header = srt_read_header, |
| 166 | .read_packet = srt_read_packet, |
| 167 | .read_seek2 = srt_read_seek, |
| 168 | .read_close = srt_read_close, |
| 169 | }; |