1/* 2 * Copyright (c) 2012 Cl��ment B��sch 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 31typedef 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 39static 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 44static 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 78DECLARE_CLASS(text); 79 80AVCodec 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 94static 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 103DECLARE_CLASS(vplayer); 104 105AVCodec 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 119DECLARE_CLASS(pjs); 120 121AVCodec 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 135DECLARE_CLASS(subviewer1); 136 137AVCodec 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 */ 150