| 1 | /* |
| 2 | * Copyright (c) 2012 Clément Bœsch |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with FFmpeg; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | /** |
| 22 | * @file |
| 23 | * Raw subtitles decoder |
| 24 | */ |
| 25 | |
| 26 | #include "avcodec.h" |
| 27 | #include "ass.h" |
| 28 | #include "libavutil/bprint.h" |
| 29 | #include "libavutil/opt.h" |
| 30 | |
| 31 | typedef struct { |
| 32 | AVClass *class; |
| 33 | const char *linebreaks; |
| 34 | int keep_ass_markup; |
| 35 | } TextContext; |
| 36 | |
| 37 | #define OFFSET(x) offsetof(TextContext, x) |
| 38 | #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM |
| 39 | static const AVOption options[] = { |
| 40 | { "keep_ass_markup", "Set if ASS tags must be escaped", OFFSET(keep_ass_markup), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, .flags=SD }, |
| 41 | { NULL } |
| 42 | }; |
| 43 | |
| 44 | static int text_decode_frame(AVCodecContext *avctx, void *data, |
| 45 | int *got_sub_ptr, AVPacket *avpkt) |
| 46 | { |
| 47 | AVBPrint buf; |
| 48 | AVSubtitle *sub = data; |
| 49 | const char *ptr = avpkt->data; |
| 50 | const TextContext *text = avctx->priv_data; |
| 51 | const int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100}); |
| 52 | const int ts_duration = avpkt->duration != -1 ? |
| 53 | av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1; |
| 54 | |
| 55 | av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
| 56 | if (ptr && avpkt->size > 0 && *ptr) { |
| 57 | ff_ass_bprint_text_event(&buf, ptr, avpkt->size, text->linebreaks, text->keep_ass_markup); |
| 58 | if (!av_bprint_is_complete(&buf)) { |
| 59 | av_bprint_finalize(&buf, NULL); |
| 60 | return AVERROR(ENOMEM); |
| 61 | } |
| 62 | ff_ass_add_rect(sub, buf.str, ts_start, ts_duration, 0); |
| 63 | } |
| 64 | *got_sub_ptr = sub->num_rects > 0; |
| 65 | av_bprint_finalize(&buf, NULL); |
| 66 | return avpkt->size; |
| 67 | } |
| 68 | |
| 69 | #define DECLARE_CLASS(decname) static const AVClass decname ## _decoder_class = { \ |
| 70 | .class_name = #decname " decoder", \ |
| 71 | .item_name = av_default_item_name, \ |
| 72 | .option = decname ## _options, \ |
| 73 | .version = LIBAVUTIL_VERSION_INT, \ |
| 74 | } |
| 75 | |
| 76 | #if CONFIG_TEXT_DECODER |
| 77 | #define text_options options |
| 78 | DECLARE_CLASS(text); |
| 79 | |
| 80 | AVCodec ff_text_decoder = { |
| 81 | .name = "text", |
| 82 | .long_name = NULL_IF_CONFIG_SMALL("Raw text subtitle"), |
| 83 | .priv_data_size = sizeof(TextContext), |
| 84 | .type = AVMEDIA_TYPE_SUBTITLE, |
| 85 | .id = AV_CODEC_ID_TEXT, |
| 86 | .decode = text_decode_frame, |
| 87 | .init = ff_ass_subtitle_header_default, |
| 88 | .priv_class = &text_decoder_class, |
| 89 | }; |
| 90 | #endif |
| 91 | |
| 92 | #if CONFIG_VPLAYER_DECODER || CONFIG_PJS_DECODER || CONFIG_SUBVIEWER1_DECODER |
| 93 | |
| 94 | static int linebreak_init(AVCodecContext *avctx) |
| 95 | { |
| 96 | TextContext *text = avctx->priv_data; |
| 97 | text->linebreaks = "|"; |
| 98 | return ff_ass_subtitle_header_default(avctx); |
| 99 | } |
| 100 | |
| 101 | #if CONFIG_VPLAYER_DECODER |
| 102 | #define vplayer_options options |
| 103 | DECLARE_CLASS(vplayer); |
| 104 | |
| 105 | AVCodec ff_vplayer_decoder = { |
| 106 | .name = "vplayer", |
| 107 | .long_name = NULL_IF_CONFIG_SMALL("VPlayer subtitle"), |
| 108 | .priv_data_size = sizeof(TextContext), |
| 109 | .type = AVMEDIA_TYPE_SUBTITLE, |
| 110 | .id = AV_CODEC_ID_VPLAYER, |
| 111 | .decode = text_decode_frame, |
| 112 | .init = linebreak_init, |
| 113 | .priv_class = &vplayer_decoder_class, |
| 114 | }; |
| 115 | #endif |
| 116 | |
| 117 | #if CONFIG_PJS_DECODER |
| 118 | #define pjs_options options |
| 119 | DECLARE_CLASS(pjs); |
| 120 | |
| 121 | AVCodec ff_pjs_decoder = { |
| 122 | .name = "pjs", |
| 123 | .long_name = NULL_IF_CONFIG_SMALL("PJS subtitle"), |
| 124 | .priv_data_size = sizeof(TextContext), |
| 125 | .type = AVMEDIA_TYPE_SUBTITLE, |
| 126 | .id = AV_CODEC_ID_PJS, |
| 127 | .decode = text_decode_frame, |
| 128 | .init = linebreak_init, |
| 129 | .priv_class = &pjs_decoder_class, |
| 130 | }; |
| 131 | #endif |
| 132 | |
| 133 | #if CONFIG_SUBVIEWER1_DECODER |
| 134 | #define subviewer1_options options |
| 135 | DECLARE_CLASS(subviewer1); |
| 136 | |
| 137 | AVCodec ff_subviewer1_decoder = { |
| 138 | .name = "subviewer1", |
| 139 | .long_name = NULL_IF_CONFIG_SMALL("SubViewer1 subtitle"), |
| 140 | .priv_data_size = sizeof(TextContext), |
| 141 | .type = AVMEDIA_TYPE_SUBTITLE, |
| 142 | .id = AV_CODEC_ID_SUBVIEWER1, |
| 143 | .decode = text_decode_frame, |
| 144 | .init = linebreak_init, |
| 145 | .priv_class = &subviewer1_decoder_class, |
| 146 | }; |
| 147 | #endif |
| 148 | |
| 149 | #endif /* text subtitles with '|' line break */ |