GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/assenc.c Lines: 18 34 52.9 %
Date: 2019-11-22 03:34:36 Branches: 6 18 33.3 %

Line Branch Exec Source
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/*
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 * SSA/ASS encoder
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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 <string.h>
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#include "avcodec.h"
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#include "ass.h"
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#include "libavutil/avstring.h"
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#include "libavutil/internal.h"
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#include "libavutil/mem.h"
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typedef struct {
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    int id; ///< current event id, ReadOrder field
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} ASSEncodeContext;
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static av_cold int ass_encode_init(AVCodecContext *avctx)
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{
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    avctx->extradata = av_malloc(avctx->subtitle_header_size + 1);
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    if (!avctx->extradata)
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        return AVERROR(ENOMEM);
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    memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size);
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    avctx->extradata_size = avctx->subtitle_header_size;
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    avctx->extradata[avctx->extradata_size] = 0;
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    return 0;
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}
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static int ass_encode_frame(AVCodecContext *avctx,
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                            unsigned char *buf, int bufsize,
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                            const AVSubtitle *sub)
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{
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    ASSEncodeContext *s = avctx->priv_data;
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    int i, len, total_len = 0;
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    for (i=0; i<sub->num_rects; i++) {
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        char ass_line[2048];
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        const char *ass = sub->rects[i]->ass;
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        long int layer;
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        char *p;
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        if (sub->rects[i]->type != SUBTITLE_ASS) {
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            av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
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            return AVERROR(EINVAL);
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        }
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#if FF_API_ASS_TIMING
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        if (!strncmp(ass, "Dialogue: ", 10)) {
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            if (i > 0) {
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                av_log(avctx, AV_LOG_ERROR, "ASS encoder supports only one "
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                       "ASS rectangle field.\n");
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                return AVERROR_INVALIDDATA;
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            }
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            ass += 10; // skip "Dialogue: "
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            /* parse Layer field. If it's a Marked field, the content
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             * will be "Marked=N" instead of the layer num, so we will
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             * have layer=0, which is fine. */
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            layer = strtol(ass, &p, 10);
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#define SKIP_ENTRY(ptr) do {        \
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    char *sep = strchr(ptr, ',');   \
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    if (sep)                        \
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        ptr = sep + 1;              \
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} while (0)
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            SKIP_ENTRY(p); // skip layer or marked
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            SKIP_ENTRY(p); // skip start timestamp
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            SKIP_ENTRY(p); // skip end timestamp
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            snprintf(ass_line, sizeof(ass_line), "%d,%ld,%s", ++s->id, layer, p);
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            ass_line[strcspn(ass_line, "\r\n")] = 0;
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            ass = ass_line;
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        }
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#endif
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        len = av_strlcpy(buf+total_len, ass, bufsize-total_len);
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        if (len > bufsize-total_len-1) {
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            av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
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            return AVERROR(EINVAL);
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        }
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        total_len += len;
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    }
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    return total_len;
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}
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#if CONFIG_SSA_ENCODER
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AVCodec ff_ssa_encoder = {
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    .name         = "ssa",
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    .long_name    = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"),
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    .type         = AVMEDIA_TYPE_SUBTITLE,
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    .id           = AV_CODEC_ID_ASS,
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    .init         = ass_encode_init,
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    .encode_sub   = ass_encode_frame,
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    .priv_data_size = sizeof(ASSEncodeContext),
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};
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#endif
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#if CONFIG_ASS_ENCODER
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AVCodec ff_ass_encoder = {
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    .name         = "ass",
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    .long_name    = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"),
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    .type         = AVMEDIA_TYPE_SUBTITLE,
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    .id           = AV_CODEC_ID_ASS,
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    .init         = ass_encode_init,
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    .encode_sub   = ass_encode_frame,
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    .priv_data_size = sizeof(ASSEncodeContext),
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};
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#endif