blob: 805c7dd5476d99bb879073aa2c26c2eeaa30b426
| 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 | * SubViewer subtitle decoder |
| 24 | * @see https://en.wikipedia.org/wiki/SubViewer |
| 25 | */ |
| 26 | |
| 27 | #include "avcodec.h" |
| 28 | #include "ass.h" |
| 29 | #include "libavutil/bprint.h" |
| 30 | |
| 31 | static int subviewer_event_to_ass(AVBPrint *buf, const char *p) |
| 32 | { |
| 33 | while (*p) { |
| 34 | if (!strncmp(p, "[br]", 4)) { |
| 35 | av_bprintf(buf, "\\N"); |
| 36 | p += 4; |
| 37 | } else { |
| 38 | if (p[0] == '\n' && p[1]) |
| 39 | av_bprintf(buf, "\\N"); |
| 40 | else if (*p != '\n' && *p != '\r') |
| 41 | av_bprint_chars(buf, *p, 1); |
| 42 | p++; |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | return 0; |
| 47 | } |
| 48 | |
| 49 | static int subviewer_decode_frame(AVCodecContext *avctx, |
| 50 | void *data, int *got_sub_ptr, AVPacket *avpkt) |
| 51 | { |
| 52 | int ret = 0; |
| 53 | AVSubtitle *sub = data; |
| 54 | const char *ptr = avpkt->data; |
| 55 | FFASSDecoderContext *s = avctx->priv_data; |
| 56 | AVBPrint buf; |
| 57 | |
| 58 | av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
| 59 | if (ptr && avpkt->size > 0 && !subviewer_event_to_ass(&buf, ptr)) |
| 60 | ret = ff_ass_add_rect(sub, buf.str, s->readorder++, 0, NULL, NULL); |
| 61 | av_bprint_finalize(&buf, NULL); |
| 62 | if (ret < 0) |
| 63 | return ret; |
| 64 | *got_sub_ptr = sub->num_rects > 0; |
| 65 | return avpkt->size; |
| 66 | } |
| 67 | |
| 68 | AVCodec ff_subviewer_decoder = { |
| 69 | .name = "subviewer", |
| 70 | .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle"), |
| 71 | .type = AVMEDIA_TYPE_SUBTITLE, |
| 72 | .id = AV_CODEC_ID_SUBVIEWER, |
| 73 | .decode = subviewer_decode_frame, |
| 74 | .init = ff_ass_subtitle_header_default, |
| 75 | .flush = ff_ass_decoder_flush, |
| 76 | .priv_data_size = sizeof(FFASSDecoderContext), |
| 77 | }; |
| 78 |