LCOV - code coverage report
Current view: top level - libavcodec - srtdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 28 33 84.8 %
Date: 2017-12-16 13:57:32 Functions: 2 2 100.0 %

          Line data    Source code
       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         121 : static int srt_to_ass(AVCodecContext *avctx, AVBPrint *dst,
      31             :                        const char *in, int x1, int y1, int x2, int y2)
      32             : {
      33         121 :     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           6 :         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           3 :             const int cx = x1 + (x2 - x1)/2;
      40           3 :             const int cy = y1 + (y2 - y1)/2;
      41           3 :             const int scaled_x = cx * (int64_t)ASS_DEFAULT_PLAYRESX / 720;
      42           3 :             const int scaled_y = cy * (int64_t)ASS_DEFAULT_PLAYRESY / 480;
      43           3 :             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           0 :             const int scaled_x = x1 * (int64_t)ASS_DEFAULT_PLAYRESX / 720;
      47           0 :             const int scaled_y = y1 * (int64_t)ASS_DEFAULT_PLAYRESY / 480;
      48           0 :             av_bprintf(dst, "{\\an1}{\\pos(%d,%d)}", scaled_x, scaled_y);
      49             :         }
      50             :     }
      51             : 
      52         121 :     return ff_htmlmarkup_to_ass(avctx, dst, in);
      53             : }
      54             : 
      55         121 : static int srt_decode_frame(AVCodecContext *avctx,
      56             :                             void *data, int *got_sub_ptr, AVPacket *avpkt)
      57             : {
      58         121 :     AVSubtitle *sub = data;
      59             :     AVBPrint buffer;
      60         121 :     int x1 = -1, y1 = -1, x2 = -1, y2 = -1;
      61             :     int size, ret;
      62         121 :     const uint8_t *p = av_packet_get_side_data(avpkt, AV_PKT_DATA_SUBTITLE_POSITION, &size);
      63         121 :     FFASSDecoderContext *s = avctx->priv_data;
      64             : 
      65         121 :     if (p && size == 16) {
      66           3 :         x1 = AV_RL32(p     );
      67           3 :         y1 = AV_RL32(p +  4);
      68           3 :         x2 = AV_RL32(p +  8);
      69           3 :         y2 = AV_RL32(p + 12);
      70             :     }
      71             : 
      72         121 :     if (avpkt->size <= 0)
      73           0 :         return avpkt->size;
      74             : 
      75         121 :     av_bprint_init(&buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
      76             : 
      77         121 :     ret = srt_to_ass(avctx, &buffer, avpkt->data, x1, y1, x2, y2);
      78         121 :     if (ret >= 0)
      79         121 :         ret = ff_ass_add_rect(sub, buffer.str, s->readorder++, 0, NULL, NULL);
      80         121 :     av_bprint_finalize(&buffer, NULL);
      81         121 :     if (ret < 0)
      82           0 :         return ret;
      83             : 
      84         121 :     *got_sub_ptr = sub->num_rects > 0;
      85         121 :     return avpkt->size;
      86             : }
      87             : 
      88             : #if CONFIG_SRT_DECODER
      89             : /* deprecated decoder */
      90             : AVCodec ff_srt_decoder = {
      91             :     .name         = "srt",
      92             :     .long_name    = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
      93             :     .type         = AVMEDIA_TYPE_SUBTITLE,
      94             :     .id           = AV_CODEC_ID_SUBRIP,
      95             :     .init         = ff_ass_subtitle_header_default,
      96             :     .decode       = srt_decode_frame,
      97             :     .flush        = ff_ass_decoder_flush,
      98             :     .priv_data_size = sizeof(FFASSDecoderContext),
      99             : };
     100             : #endif
     101             : 
     102             : #if CONFIG_SUBRIP_DECODER
     103             : AVCodec ff_subrip_decoder = {
     104             :     .name         = "subrip",
     105             :     .long_name    = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
     106             :     .type         = AVMEDIA_TYPE_SUBTITLE,
     107             :     .id           = AV_CODEC_ID_SUBRIP,
     108             :     .init         = ff_ass_subtitle_header_default,
     109             :     .decode       = srt_decode_frame,
     110             :     .flush        = ff_ass_decoder_flush,
     111             :     .priv_data_size = sizeof(FFASSDecoderContext),
     112             : };
     113             : #endif

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