GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/samidec.c Lines: 89 101 88.1 %
Date: 2020-10-23 17:01:47 Branches: 44 62 71.0 %

Line Branch Exec Source
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/*
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 * Copyright (c) 2012 Clément Bœsch
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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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/**
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 * @file
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 * SAMI subtitle decoder
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 * @see http://msdn.microsoft.com/en-us/library/ms971327.aspx
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 */
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#include "ass.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bprint.h"
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#include "htmlsubtitles.h"
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typedef struct {
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    AVBPrint source;
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    AVBPrint content;
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    AVBPrint encoded_source;
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    AVBPrint encoded_content;
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    AVBPrint full;
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    int readorder;
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} SAMIContext;
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167
static int sami_paragraph_to_ass(AVCodecContext *avctx, const char *src)
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{
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167
    SAMIContext *sami = avctx->priv_data;
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167
    int ret = 0;
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167
    char *tag = NULL;
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167
    char *dupsrc = av_strdup(src);
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167
    char *p = dupsrc;
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167
    AVBPrint *dst_content = &sami->encoded_content;
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167
    AVBPrint *dst_source = &sami->encoded_source;
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167
    if (!dupsrc)
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        return AVERROR(ENOMEM);
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167
    av_bprint_clear(&sami->encoded_content);
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167
    av_bprint_clear(&sami->content);
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167
    av_bprint_clear(&sami->encoded_source);
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89
    for (;;) {
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256
        char *saveptr = NULL;
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        int prev_chr_is_space = 0;
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256
        AVBPrint *dst = &sami->content;
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        /* parse & extract paragraph tag */
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        p = av_stristr(p, "<P");
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256
        if (!p)
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88
            break;
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168
        if (p[2] != '>' && !av_isspace(p[2])) { // avoid confusion with tags such as <PRE>
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            p++;
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            continue;
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        }
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168
        if (dst->len) // add a separator with the previous paragraph if there was one
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            av_bprintf(dst, "\\N");
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        tag = av_strtok(p, ">", &saveptr);
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        if (!tag || !saveptr)
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            break;
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168
        p = saveptr;
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        /* check if the current paragraph is the "source" (speaker name) */
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168
        if (av_stristr(tag, "ID=Source") || av_stristr(tag, "ID=\"Source\"")) {
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2
            dst = &sami->source;
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2
            av_bprint_clear(dst);
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        }
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        /* if empty event -> skip subtitle */
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245
        while (av_isspace(*p))
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77
            p++;
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168
        if (!strncmp(p, "&nbsp;", 6)) {
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            ret = -1;
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            goto end;
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        }
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        /* extract the text, stripping most of the tags */
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6981
        while (*p) {
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6893
            if (*p == '<') {
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                if (!av_strncasecmp(p, "<P", 2) && (p[2] == '>' || av_isspace(p[2])))
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                    break;
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            }
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6892
            if (!av_strncasecmp(p, "<BR", 3)) {
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137
                av_bprintf(dst, "\\N");
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                p++;
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411
                while (*p && *p != '>')
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274
                    p++;
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137
                if (!*p)
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                    break;
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                if (*p == '>')
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                    p++;
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                continue;
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            }
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6755
            if (!av_isspace(*p))
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5951
                av_bprint_chars(dst, *p, 1);
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804
            else if (!prev_chr_is_space)
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683
                av_bprint_chars(dst, ' ', 1);
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6755
            prev_chr_is_space = av_isspace(*p);
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6755
            p++;
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        }
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    }
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    av_bprint_clear(&sami->full);
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88
    if (sami->source.len) {
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9
        ret = ff_htmlmarkup_to_ass(avctx, dst_source, sami->source.str);
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9
        if (ret < 0)
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            goto end;
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9
        av_bprintf(&sami->full, "{\\i1}%s{\\i0}\\N", sami->encoded_source.str);
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    }
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88
    ret = ff_htmlmarkup_to_ass(avctx, dst_content, sami->content.str);
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88
    if (ret < 0)
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        goto end;
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    av_bprintf(&sami->full, "%s", sami->encoded_content.str);
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129
167
end:
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167
    av_free(dupsrc);
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167
    return ret;
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}
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167
static int sami_decode_frame(AVCodecContext *avctx,
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                             void *data, int *got_sub_ptr, AVPacket *avpkt)
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{
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167
    AVSubtitle *sub = data;
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    const char *ptr = avpkt->data;
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167
    SAMIContext *sami = avctx->priv_data;
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167
    if (ptr && avpkt->size > 0) {
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167
        int ret = sami_paragraph_to_ass(avctx, ptr);
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167
        if (ret < 0)
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79
            return ret;
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        // TODO: pass escaped sami->encoded_source.str as source
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88
        ret = ff_ass_add_rect(sub, sami->full.str, sami->readorder++, 0, NULL, NULL);
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88
        if (ret < 0)
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            return ret;
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    }
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    *got_sub_ptr = sub->num_rects > 0;
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88
    return avpkt->size;
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}
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154
4
static av_cold int sami_init(AVCodecContext *avctx)
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{
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4
    SAMIContext *sami = avctx->priv_data;
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4
    av_bprint_init(&sami->source,  0, 2048);
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    av_bprint_init(&sami->content, 0, 2048);
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4
    av_bprint_init(&sami->encoded_source,  0, 2048);
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    av_bprint_init(&sami->encoded_content, 0, 2048);
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    av_bprint_init(&sami->full,    0, 2048);
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    return ff_ass_subtitle_header_default(avctx);
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}
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4
static av_cold int sami_close(AVCodecContext *avctx)
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{
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4
    SAMIContext *sami = avctx->priv_data;
168
4
    av_bprint_finalize(&sami->source,  NULL);
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    av_bprint_finalize(&sami->content, NULL);
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    av_bprint_finalize(&sami->encoded_source,  NULL);
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4
    av_bprint_finalize(&sami->encoded_content, NULL);
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4
    av_bprint_finalize(&sami->full,    NULL);
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4
    return 0;
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}
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static void sami_flush(AVCodecContext *avctx)
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{
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    SAMIContext *sami = avctx->priv_data;
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    if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
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        sami->readorder = 0;
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}
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AVCodec ff_sami_decoder = {
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    .name           = "sami",
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    .long_name      = NULL_IF_CONFIG_SMALL("SAMI subtitle"),
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    .type           = AVMEDIA_TYPE_SUBTITLE,
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    .id             = AV_CODEC_ID_SAMI,
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    .priv_data_size = sizeof(SAMIContext),
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    .init           = sami_init,
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    .close          = sami_close,
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    .decode         = sami_decode_frame,
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    .flush          = sami_flush,
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};