blob: c5fda64738e65116a0214eba684bd125665edc05
| 1 | /* |
| 2 | * LRC lyrics file format decoder |
| 3 | * Copyright (c) 2014 StarBrilliant <m13253@hotmail.com> |
| 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 <inttypes.h> |
| 23 | #include <stdint.h> |
| 24 | #include <string.h> |
| 25 | |
| 26 | #include "avformat.h" |
| 27 | #include "internal.h" |
| 28 | #include "lrc.h" |
| 29 | #include "metadata.h" |
| 30 | #include "subtitles.h" |
| 31 | #include "version.h" |
| 32 | #include "libavutil/bprint.h" |
| 33 | #include "libavutil/dict.h" |
| 34 | #include "libavutil/log.h" |
| 35 | #include "libavutil/macros.h" |
| 36 | |
| 37 | static int lrc_write_header(AVFormatContext *s) |
| 38 | { |
| 39 | const AVDictionaryEntry *metadata_item; |
| 40 | |
| 41 | if(s->nb_streams != 1 || |
| 42 | s->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) { |
| 43 | av_log(s, AV_LOG_ERROR, |
| 44 | "LRC supports only a single subtitle stream.\n"); |
| 45 | return AVERROR(EINVAL); |
| 46 | } |
| 47 | if(s->streams[0]->codecpar->codec_id != AV_CODEC_ID_SUBRIP && |
| 48 | s->streams[0]->codecpar->codec_id != AV_CODEC_ID_TEXT) { |
| 49 | av_log(s, AV_LOG_ERROR, "Unsupported subtitle codec: %s\n", |
| 50 | avcodec_get_name(s->streams[0]->codecpar->codec_id)); |
| 51 | return AVERROR(EINVAL); |
| 52 | } |
| 53 | avpriv_set_pts_info(s->streams[0], 64, 1, 100); |
| 54 | |
| 55 | ff_standardize_creation_time(s); |
| 56 | ff_metadata_conv_ctx(s, ff_lrc_metadata_conv, NULL); |
| 57 | if(!(s->flags & AVFMT_FLAG_BITEXACT)) { // avoid breaking regression tests |
| 58 | /* LRC provides a metadata slot for specifying encoder version |
| 59 | * in addition to encoder name. We will store LIBAVFORMAT_VERSION |
| 60 | * to it. |
| 61 | */ |
| 62 | av_dict_set(&s->metadata, "ve", AV_STRINGIFY(LIBAVFORMAT_VERSION), 0); |
| 63 | } else { |
| 64 | av_dict_set(&s->metadata, "ve", NULL, 0); |
| 65 | } |
| 66 | for(metadata_item = NULL; |
| 67 | (metadata_item = av_dict_get(s->metadata, "", metadata_item, |
| 68 | AV_DICT_IGNORE_SUFFIX));) { |
| 69 | char *delim; |
| 70 | if(!metadata_item->value[0]) { |
| 71 | continue; |
| 72 | } |
| 73 | while((delim = strchr(metadata_item->value, '\n'))) { |
| 74 | *delim = ' '; |
| 75 | } |
| 76 | while((delim = strchr(metadata_item->value, '\r'))) { |
| 77 | *delim = ' '; |
| 78 | } |
| 79 | avio_printf(s->pb, "[%s:%s]\n", |
| 80 | metadata_item->key, metadata_item->value); |
| 81 | } |
| 82 | avio_printf(s->pb, "\n"); |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | static int lrc_write_packet(AVFormatContext *s, AVPacket *pkt) |
| 87 | { |
| 88 | if(pkt->pts != AV_NOPTS_VALUE) { |
| 89 | char *data = av_malloc(pkt->size + 1); |
| 90 | char *line; |
| 91 | char *delim; |
| 92 | |
| 93 | if(!data) { |
| 94 | return AVERROR(ENOMEM); |
| 95 | } |
| 96 | memcpy(data, pkt->data, pkt->size); |
| 97 | data[pkt->size] = '\0'; |
| 98 | |
| 99 | for(delim = data + pkt->size - 1; |
| 100 | delim >= data && (delim[0] == '\n' || delim[0] == '\r'); delim--) { |
| 101 | delim[0] = '\0'; // Strip last empty lines |
| 102 | } |
| 103 | line = data; |
| 104 | while(line[0] == '\n' || line[0] == '\r') { |
| 105 | line++; // Skip first empty lines |
| 106 | } |
| 107 | |
| 108 | while(line) { |
| 109 | delim = strchr(line, '\n'); |
| 110 | if(delim) { |
| 111 | if(delim > line && delim[-1] == '\r') { |
| 112 | delim[-1] = '\0'; |
| 113 | } |
| 114 | delim[0] = '\0'; |
| 115 | delim++; |
| 116 | } |
| 117 | if(line[0] == '[') { |
| 118 | av_log(s, AV_LOG_WARNING, |
| 119 | "Subtitle starts with '[', may cause problems with LRC format.\n"); |
| 120 | } |
| 121 | |
| 122 | if(pkt->pts >= 0) { |
| 123 | avio_printf(s->pb, "[%02"PRId64":%02"PRId64".%02"PRId64"]", |
| 124 | (pkt->pts / 6000), |
| 125 | ((pkt->pts / 100) % 60), |
| 126 | (pkt->pts % 100)); |
| 127 | } else { |
| 128 | /* Offset feature of LRC can easily make pts negative, |
| 129 | * we just output it directly and let the player drop it. */ |
| 130 | avio_printf(s->pb, "[-%02"PRId64":%02"PRId64".%02"PRId64"]", |
| 131 | (-pkt->pts) / 6000, |
| 132 | ((-pkt->pts) / 100) % 60, |
| 133 | (-pkt->pts) % 100); |
| 134 | } |
| 135 | avio_printf(s->pb, "%s\n", line); |
| 136 | line = delim; |
| 137 | } |
| 138 | av_free(data); |
| 139 | } |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | AVOutputFormat ff_lrc_muxer = { |
| 144 | .name = "lrc", |
| 145 | .long_name = NULL_IF_CONFIG_SMALL("LRC lyrics"), |
| 146 | .extensions = "lrc", |
| 147 | .priv_data_size = 0, |
| 148 | .write_header = lrc_write_header, |
| 149 | .write_packet = lrc_write_packet, |
| 150 | .flags = AVFMT_VARIABLE_FPS | AVFMT_GLOBALHEADER | |
| 151 | AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT, |
| 152 | .subtitle_codec = AV_CODEC_ID_SUBRIP |
| 153 | }; |
| 154 |