GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/srtdec.c Lines: 28 33 84.8 %
Date: 2021-04-14 23:45:22 Branches: 15 26 57.7 %

Line Branch Exec Source
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/*
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 * SubRip subtitle decoder
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 * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/avstring.h"
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#include "libavutil/common.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/parseutils.h"
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#include "avcodec.h"
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#include "ass.h"
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#include "htmlsubtitles.h"
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static int srt_to_ass(AVCodecContext *avctx, AVBPrint *dst,
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                       const char *in, int x1, int y1, int x2, int y2)
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{
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    if (x1 >= 0 && y1 >= 0) {
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        /* XXX: here we rescale coordinate assuming they are in DVD resolution
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         * (720x480) since we don't have anything better */
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        if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1) && x2 >= x1 && y2 >= y1) {
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            /* text rectangle defined, write the text at the center of the rectangle */
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            const int cx = x1 + (x2 - x1)/2;
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            const int cy = y1 + (y2 - y1)/2;
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            const int scaled_x = cx * (int64_t)ASS_DEFAULT_PLAYRESX / 720;
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            const int scaled_y = cy * (int64_t)ASS_DEFAULT_PLAYRESY / 480;
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            av_bprintf(dst, "{\\an5}{\\pos(%d,%d)}", scaled_x, scaled_y);
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        } else {
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            /* only the top left corner, assume the text starts in that corner */
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            const int scaled_x = x1 * (int64_t)ASS_DEFAULT_PLAYRESX / 720;
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            const int scaled_y = y1 * (int64_t)ASS_DEFAULT_PLAYRESY / 480;
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            av_bprintf(dst, "{\\an1}{\\pos(%d,%d)}", scaled_x, scaled_y);
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        }
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    }
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    return ff_htmlmarkup_to_ass(avctx, dst, in);
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}
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static int srt_decode_frame(AVCodecContext *avctx,
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                            void *data, int *got_sub_ptr, AVPacket *avpkt)
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{
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    AVSubtitle *sub = data;
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    AVBPrint buffer;
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    int x1 = -1, y1 = -1, x2 = -1, y2 = -1;
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    int ret;
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    buffer_size_t size;
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    const uint8_t *p = av_packet_get_side_data(avpkt, AV_PKT_DATA_SUBTITLE_POSITION, &size);
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    FFASSDecoderContext *s = avctx->priv_data;
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    if (p && size == 16) {
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        x1 = AV_RL32(p     );
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        y1 = AV_RL32(p +  4);
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        x2 = AV_RL32(p +  8);
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        y2 = AV_RL32(p + 12);
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    }
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    if (avpkt->size <= 0)
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        return avpkt->size;
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    av_bprint_init(&buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
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    ret = srt_to_ass(avctx, &buffer, avpkt->data, x1, y1, x2, y2);
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    if (ret >= 0)
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        ret = ff_ass_add_rect(sub, buffer.str, s->readorder++, 0, NULL, NULL);
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    av_bprint_finalize(&buffer, NULL);
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    if (ret < 0)
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        return ret;
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    *got_sub_ptr = sub->num_rects > 0;
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    return avpkt->size;
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}
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#if CONFIG_SRT_DECODER
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/* deprecated decoder */
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AVCodec ff_srt_decoder = {
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    .name         = "srt",
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    .long_name    = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
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    .type         = AVMEDIA_TYPE_SUBTITLE,
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    .id           = AV_CODEC_ID_SUBRIP,
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    .init         = ff_ass_subtitle_header_default,
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    .decode       = srt_decode_frame,
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    .flush        = ff_ass_decoder_flush,
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    .priv_data_size = sizeof(FFASSDecoderContext),
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};
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#endif
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#if CONFIG_SUBRIP_DECODER
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AVCodec ff_subrip_decoder = {
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    .name         = "subrip",
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    .long_name    = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
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    .type         = AVMEDIA_TYPE_SUBTITLE,
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    .id           = AV_CODEC_ID_SUBRIP,
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    .init         = ff_ass_subtitle_header_default,
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    .decode       = srt_decode_frame,
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    .flush        = ff_ass_decoder_flush,
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    .priv_data_size = sizeof(FFASSDecoderContext),
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};
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#endif