Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * SSA/ASS muxer |
||
| 3 | * Copyright (c) 2008 Michael Niedermayer |
||
| 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 | |||
| 25 | typedef struct ASSContext{ |
||
| 26 | unsigned int extra_index; |
||
| 27 | int write_ts; // 0: ssa (timing in payload), 1: ass (matroska like) |
||
| 28 | }ASSContext; |
||
| 29 | |||
| 30 | static int write_header(AVFormatContext *s) |
||
| 31 | { |
||
| 32 | ASSContext *ass = s->priv_data; |
||
| 33 | AVCodecContext *avctx= s->streams[0]->codec; |
||
| 34 | uint8_t *last= NULL; |
||
| 35 | |||
| 36 | if (s->nb_streams != 1 || (avctx->codec_id != AV_CODEC_ID_SSA && |
||
| 37 | avctx->codec_id != AV_CODEC_ID_ASS)) { |
||
| 38 | av_log(s, AV_LOG_ERROR, "Exactly one ASS/SSA stream is needed.\n"); |
||
| 39 | return -1; |
||
| 40 | } |
||
| 41 | ass->write_ts = avctx->codec_id == AV_CODEC_ID_ASS; |
||
| 42 | avpriv_set_pts_info(s->streams[0], 64, 1, 100); |
||
| 43 | |||
| 44 | while(ass->extra_index < avctx->extradata_size){ |
||
| 45 | uint8_t *p = avctx->extradata + ass->extra_index; |
||
| 46 | uint8_t *end= strchr(p, '\n'); |
||
| 47 | if(!end) end= avctx->extradata + avctx->extradata_size; |
||
| 48 | else end++; |
||
| 49 | |||
| 50 | avio_write(s->pb, p, end-p); |
||
| 51 | ass->extra_index += end-p; |
||
| 52 | |||
| 53 | if(last && !memcmp(last, "[Events]", 8)) |
||
| 54 | break; |
||
| 55 | last=p; |
||
| 56 | } |
||
| 57 | |||
| 58 | avio_flush(s->pb); |
||
| 59 | |||
| 60 | return 0; |
||
| 61 | } |
||
| 62 | |||
| 63 | static int write_packet(AVFormatContext *s, AVPacket *pkt) |
||
| 64 | { |
||
| 65 | ASSContext *ass = s->priv_data; |
||
| 66 | |||
| 67 | if (ass->write_ts) { |
||
| 68 | long int layer; |
||
| 69 | char *p; |
||
| 70 | int64_t start = pkt->pts; |
||
| 71 | int64_t end = start + pkt->duration; |
||
| 72 | int hh1, mm1, ss1, ms1; |
||
| 73 | int hh2, mm2, ss2, ms2; |
||
| 74 | |||
| 75 | p = pkt->data + strcspn(pkt->data, ",") + 1; // skip ReadOrder |
||
| 76 | layer = strtol(p, &p, 10); |
||
| 77 | if (*p == ',') |
||
| 78 | p++; |
||
| 79 | hh1 = (int)(start / 360000); mm1 = (int)(start / 6000) % 60; |
||
| 80 | hh2 = (int)(end / 360000); mm2 = (int)(end / 6000) % 60; |
||
| 81 | ss1 = (int)(start / 100) % 60; ms1 = (int)(start % 100); |
||
| 82 | ss2 = (int)(end / 100) % 60; ms2 = (int)(end % 100); |
||
| 83 | if (hh1 > 9) hh1 = 9, mm1 = 59, ss1 = 59, ms1 = 99; |
||
| 84 | if (hh2 > 9) hh2 = 9, mm2 = 59, ss2 = 59, ms2 = 99; |
||
| 85 | avio_printf(s->pb, "Dialogue: %ld,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n", |
||
| 86 | layer, hh1, mm1, ss1, ms1, hh2, mm2, ss2, ms2, p); |
||
| 87 | } else { |
||
| 88 | avio_write(s->pb, pkt->data, pkt->size); |
||
| 89 | } |
||
| 90 | |||
| 91 | return 0; |
||
| 92 | } |
||
| 93 | |||
| 94 | static int write_trailer(AVFormatContext *s) |
||
| 95 | { |
||
| 96 | ASSContext *ass = s->priv_data; |
||
| 97 | AVCodecContext *avctx= s->streams[0]->codec; |
||
| 98 | |||
| 99 | avio_write(s->pb, avctx->extradata + ass->extra_index, |
||
| 100 | avctx->extradata_size - ass->extra_index); |
||
| 101 | |||
| 102 | return 0; |
||
| 103 | } |
||
| 104 | |||
| 105 | AVOutputFormat ff_ass_muxer = { |
||
| 106 | .name = "ass", |
||
| 107 | .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"), |
||
| 108 | .mime_type = "text/x-ssa", |
||
| 109 | .extensions = "ass,ssa", |
||
| 110 | .priv_data_size = sizeof(ASSContext), |
||
| 111 | .subtitle_codec = AV_CODEC_ID_SSA, |
||
| 112 | .write_header = write_header, |
||
| 113 | .write_packet = write_packet, |
||
| 114 | .write_trailer = write_trailer, |
||
| 115 | .flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS | AVFMT_TS_NONSTRICT, |
||
| 116 | }; |