blob: 862ab476458757b36a6ef97393778c33234c5ab2
| 1 | /* |
| 2 | * SubRip subtitle decoder |
| 3 | * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "libavutil/avstring.h" |
| 23 | #include "libavutil/common.h" |
| 24 | #include "libavutil/intreadwrite.h" |
| 25 | #include "libavutil/parseutils.h" |
| 26 | #include "avcodec.h" |
| 27 | #include "ass.h" |
| 28 | #include "htmlsubtitles.h" |
| 29 | |
| 30 | static void srt_to_ass(AVCodecContext *avctx, AVBPrint *dst, |
| 31 | const char *in, int x1, int y1, int x2, int y2) |
| 32 | { |
| 33 | if (x1 >= 0 && y1 >= 0) { |
| 34 | /* XXX: here we rescale coordinate assuming they are in DVD resolution |
| 35 | * (720x480) since we don't have anything better */ |
| 36 | |
| 37 | if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1) && x2 >= x1 && y2 >= y1) { |
| 38 | /* text rectangle defined, write the text at the center of the rectangle */ |
| 39 | const int cx = x1 + (x2 - x1)/2; |
| 40 | const int cy = y1 + (y2 - y1)/2; |
| 41 | const int scaled_x = cx * (int64_t)ASS_DEFAULT_PLAYRESX / 720; |
| 42 | const int scaled_y = cy * (int64_t)ASS_DEFAULT_PLAYRESY / 480; |
| 43 | av_bprintf(dst, "{\\an5}{\\pos(%d,%d)}", scaled_x, scaled_y); |
| 44 | } else { |
| 45 | /* only the top left corner, assume the text starts in that corner */ |
| 46 | const int scaled_x = x1 * (int64_t)ASS_DEFAULT_PLAYRESX / 720; |
| 47 | const int scaled_y = y1 * (int64_t)ASS_DEFAULT_PLAYRESY / 480; |
| 48 | av_bprintf(dst, "{\\an1}{\\pos(%d,%d)}", scaled_x, scaled_y); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | ff_htmlmarkup_to_ass(avctx, dst, in); |
| 53 | } |
| 54 | |
| 55 | static int srt_decode_frame(AVCodecContext *avctx, |
| 56 | void *data, int *got_sub_ptr, AVPacket *avpkt) |
| 57 | { |
| 58 | AVSubtitle *sub = data; |
| 59 | AVBPrint buffer; |
| 60 | int x1 = -1, y1 = -1, x2 = -1, y2 = -1; |
| 61 | int size, ret; |
| 62 | const uint8_t *p = av_packet_get_side_data(avpkt, AV_PKT_DATA_SUBTITLE_POSITION, &size); |
| 63 | FFASSDecoderContext *s = avctx->priv_data; |
| 64 | |
| 65 | if (p && size == 16) { |
| 66 | x1 = AV_RL32(p ); |
| 67 | y1 = AV_RL32(p + 4); |
| 68 | x2 = AV_RL32(p + 8); |
| 69 | y2 = AV_RL32(p + 12); |
| 70 | } |
| 71 | |
| 72 | if (avpkt->size <= 0) |
| 73 | return avpkt->size; |
| 74 | |
| 75 | av_bprint_init(&buffer, 0, AV_BPRINT_SIZE_UNLIMITED); |
| 76 | |
| 77 | srt_to_ass(avctx, &buffer, avpkt->data, x1, y1, x2, y2); |
| 78 | ret = ff_ass_add_rect(sub, buffer.str, s->readorder++, 0, NULL, NULL); |
| 79 | av_bprint_finalize(&buffer, NULL); |
| 80 | if (ret < 0) |
| 81 | return ret; |
| 82 | |
| 83 | *got_sub_ptr = sub->num_rects > 0; |
| 84 | return avpkt->size; |
| 85 | } |
| 86 | |
| 87 | #if CONFIG_SRT_DECODER |
| 88 | /* deprecated decoder */ |
| 89 | AVCodec ff_srt_decoder = { |
| 90 | .name = "srt", |
| 91 | .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
| 92 | .type = AVMEDIA_TYPE_SUBTITLE, |
| 93 | .id = AV_CODEC_ID_SUBRIP, |
| 94 | .init = ff_ass_subtitle_header_default, |
| 95 | .decode = srt_decode_frame, |
| 96 | .flush = ff_ass_decoder_flush, |
| 97 | .priv_data_size = sizeof(FFASSDecoderContext), |
| 98 | }; |
| 99 | #endif |
| 100 | |
| 101 | #if CONFIG_SUBRIP_DECODER |
| 102 | AVCodec ff_subrip_decoder = { |
| 103 | .name = "subrip", |
| 104 | .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
| 105 | .type = AVMEDIA_TYPE_SUBTITLE, |
| 106 | .id = AV_CODEC_ID_SUBRIP, |
| 107 | .init = ff_ass_subtitle_header_default, |
| 108 | .decode = srt_decode_frame, |
| 109 | .flush = ff_ass_decoder_flush, |
| 110 | .priv_data_size = sizeof(FFASSDecoderContext), |
| 111 | }; |
| 112 | #endif |
| 113 |