| /* |
| * Copyright (c) 2012 Clément Bœsch |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * Raw subtitles decoder |
| */ |
| |
| #include "avcodec.h" |
| #include "ass.h" |
| #include "libavutil/bprint.h" |
| #include "libavutil/opt.h" |
| |
| typedef struct { |
| AVClass *class; |
| const char *linebreaks; |
| int keep_ass_markup; |
| } TextContext; |
| |
| #define OFFSET(x) offsetof(TextContext, x) |
| #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM |
| static const AVOption options[] = { |
| { "keep_ass_markup", "Set if ASS tags must be escaped", OFFSET(keep_ass_markup), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, .flags=SD }, |
| { NULL } |
| }; |
| |
| static int text_event_to_ass(const AVCodecContext *avctx, AVBPrint *buf, |
| const char *p, const char *p_end) |
| { |
| const TextContext *text = avctx->priv_data; |
| |
| for (; p < p_end && *p; p++) { |
| |
| /* forced custom line breaks, not accounted as "normal" EOL */ |
| if (text->linebreaks && strchr(text->linebreaks, *p)) { |
| av_bprintf(buf, "\\N"); |
| |
| /* standard ASS escaping so random characters don't get mis-interpreted |
| * as ASS */ |
| } else if (!text->keep_ass_markup && strchr("{}\\", *p)) { |
| av_bprintf(buf, "\\%c", *p); |
| |
| /* some packets might end abruptly (no \0 at the end, like for example |
| * in some cases of demuxing from a classic video container), some |
| * might be terminated with \n or \r\n which we have to remove (for |
| * consistency with those who haven't), and we also have to deal with |
| * evil cases such as \r at the end of the buffer (and no \0 terminated |
| * character) */ |
| } else if (p[0] == '\n') { |
| /* some stuff left so we can insert a line break */ |
| if (p < p_end - 1) |
| av_bprintf(buf, "\\N"); |
| } else if (p[0] == '\r' && p < p_end - 1 && p[1] == '\n') { |
| /* \r followed by a \n, we can skip it. We don't insert the \N yet |
| * because we don't know if it is followed by more text */ |
| continue; |
| |
| /* finally, a sane character */ |
| } else { |
| av_bprint_chars(buf, *p, 1); |
| } |
| } |
| av_bprintf(buf, "\r\n"); |
| return 0; |
| } |
| |
| static int text_decode_frame(AVCodecContext *avctx, void *data, |
| int *got_sub_ptr, AVPacket *avpkt) |
| { |
| AVBPrint buf; |
| AVSubtitle *sub = data; |
| const char *ptr = avpkt->data; |
| const int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100}); |
| const int ts_duration = avpkt->duration != -1 ? |
| av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1; |
| |
| av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
| if (ptr && avpkt->size > 0 && *ptr && |
| !text_event_to_ass(avctx, &buf, ptr, ptr + avpkt->size)) { |
| if (!av_bprint_is_complete(&buf)) { |
| av_bprint_finalize(&buf, NULL); |
| return AVERROR(ENOMEM); |
| } |
| ff_ass_add_rect(sub, buf.str, ts_start, ts_duration, 0); |
| } |
| *got_sub_ptr = sub->num_rects > 0; |
| av_bprint_finalize(&buf, NULL); |
| return avpkt->size; |
| } |
| |
| #define DECLARE_CLASS(decname) static const AVClass decname ## _decoder_class = { \ |
| .class_name = #decname " decoder", \ |
| .item_name = av_default_item_name, \ |
| .option = decname ## _options, \ |
| .version = LIBAVUTIL_VERSION_INT, \ |
| } |
| |
| #if CONFIG_TEXT_DECODER |
| #define text_options options |
| DECLARE_CLASS(text); |
| |
| AVCodec ff_text_decoder = { |
| .name = "text", |
| .priv_data_size = sizeof(TextContext), |
| .long_name = NULL_IF_CONFIG_SMALL("Raw text subtitle"), |
| .type = AVMEDIA_TYPE_SUBTITLE, |
| .id = AV_CODEC_ID_TEXT, |
| .decode = text_decode_frame, |
| .init = ff_ass_subtitle_header_default, |
| .priv_class = &text_decoder_class, |
| }; |
| #endif |
| |
| #if CONFIG_VPLAYER_DECODER || CONFIG_PJS_DECODER || CONFIG_SUBVIEWER1_DECODER |
| |
| static int linebreak_init(AVCodecContext *avctx) |
| { |
| TextContext *text = avctx->priv_data; |
| text->linebreaks = "|"; |
| return ff_ass_subtitle_header_default(avctx); |
| } |
| |
| #if CONFIG_VPLAYER_DECODER |
| #define vplayer_options options |
| DECLARE_CLASS(vplayer); |
| |
| AVCodec ff_vplayer_decoder = { |
| .name = "vplayer", |
| .priv_data_size = sizeof(TextContext), |
| .long_name = NULL_IF_CONFIG_SMALL("VPlayer subtitle"), |
| .type = AVMEDIA_TYPE_SUBTITLE, |
| .id = AV_CODEC_ID_VPLAYER, |
| .decode = text_decode_frame, |
| .init = linebreak_init, |
| .priv_class = &vplayer_decoder_class, |
| }; |
| #endif |
| |
| #if CONFIG_PJS_DECODER |
| #define pjs_options options |
| DECLARE_CLASS(pjs); |
| |
| AVCodec ff_pjs_decoder = { |
| .name = "pjs", |
| .priv_data_size = sizeof(TextContext), |
| .long_name = NULL_IF_CONFIG_SMALL("PJS subtitle"), |
| .type = AVMEDIA_TYPE_SUBTITLE, |
| .id = AV_CODEC_ID_PJS, |
| .decode = text_decode_frame, |
| .init = linebreak_init, |
| .priv_class = &pjs_decoder_class, |
| }; |
| #endif |
| |
| #if CONFIG_SUBVIEWER1_DECODER |
| #define subviewer1_options options |
| DECLARE_CLASS(subviewer1); |
| |
| AVCodec ff_subviewer1_decoder = { |
| .name = "subviewer1", |
| .priv_data_size = sizeof(TextContext), |
| .long_name = NULL_IF_CONFIG_SMALL("SubViewer1 subtitle"), |
| .type = AVMEDIA_TYPE_SUBTITLE, |
| .id = AV_CODEC_ID_SUBVIEWER1, |
| .decode = text_decode_frame, |
| .init = linebreak_init, |
| .priv_class = &subviewer1_decoder_class, |
| }; |
| #endif |
| |
| #endif /* text subtitles with '|' line break */ |