Function webvtt_encode_frame

libavcodec/webvttenc.c:154–188

};

static int webvtt_encode_frame(AVCodecContext *avctx,
                               unsigned char *buf, int bufsize, const AVSubtitle *sub)
{
    WebVTTContext *s = avctx->priv_data;
    ASSDialog *dialog;
    int i;

    av_bprint_init_for_buffer(&s->buffer, buf, bufsize);

    for (i=0; i<sub->num_rects; i++) {
        const char *ass = sub->rects[i]->ass;

        if (sub->rects[i]->type != SUBTITLE_ASS) {
            av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
            return AVERROR(EINVAL);
        }

        dialog = ff_ass_split_dialog(s->ass_ctx, ass);
        if (!dialog)
            return AVERROR(ENOMEM);
        webvtt_style_apply(s, dialog->style);
        ff_ass_split_override_codes(&webvtt_callbacks, s, dialog->text);
        ff_ass_free_dialog(&dialog);
    }

    if (!s->buffer.len)
        return 0;

    if (!av_bprint_is_complete(&s->buffer)) {
        av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
        return AVERROR_BUFFER_TOO_SMALL;
    }

    return s->buffer.len;
}

static av_cold int webvtt_encode_close(AVCodecContext *avctx)
{