diff options
Diffstat (limited to 'libavcodec/textdec.c')
| -rw-r--r-- | libavcodec/textdec.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/libavcodec/textdec.c b/libavcodec/textdec.c new file mode 100644 index 0000000000..d904023f51 --- /dev/null +++ b/libavcodec/textdec.c @@ -0,0 +1,149 @@ +/* + * 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_decode_frame(AVCodecContext *avctx, void *data, + int *got_sub_ptr, AVPacket *avpkt) +{ + AVBPrint buf; + AVSubtitle *sub = data; + const char *ptr = avpkt->data; + const TextContext *text = avctx->priv_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) { + ff_ass_bprint_text_event(&buf, ptr, avpkt->size, text->linebreaks, text->keep_ass_markup); + 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", + .long_name = NULL_IF_CONFIG_SMALL("Raw text subtitle"), + .priv_data_size = sizeof(TextContext), + .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", + .long_name = NULL_IF_CONFIG_SMALL("VPlayer subtitle"), + .priv_data_size = sizeof(TextContext), + .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", + .long_name = NULL_IF_CONFIG_SMALL("PJS subtitle"), + .priv_data_size = sizeof(TextContext), + .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", + .long_name = NULL_IF_CONFIG_SMALL("SubViewer1 subtitle"), + .priv_data_size = sizeof(TextContext), + .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 */ |