Function opt_map

fftools/ffmpeg_opt.c:555–700

}

static int opt_map(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    StreamMap *m = NULL;
    StreamSpecifier ss;
    int i, negative = 0, file_idx, disabled = 0;
    int ret, allow_unused = 0;

    memset(&ss, 0, sizeof(ss));

    if (*arg == '-') {
        negative = 1;
        arg++;
    }

    if (arg[0] == '[') {
        ViewSpecifier vs;
        /* this mapping refers to lavfi output */
        const char *c = arg + 1;
        char *endptr;

        ret = GROW_ARRAY(o->stream_maps, o->nb_stream_maps);
        if (ret < 0)
            goto fail;

        m = &o->stream_maps[o->nb_stream_maps - 1];
        m->linklabel = av_get_token(&c, "]");
        if (!m->linklabel) {
            av_log(NULL, AV_LOG_ERROR, "Invalid output link label: %s.\n", arg);
            ret = AVERROR(EINVAL);
            goto fail;
        }

        arg++;

        m->group_index = -1;
        file_idx = strtol(arg, &endptr, 0);
        if (file_idx >= nb_input_files || file_idx < 0)
            goto end;

        arg = endptr;
        ret = stream_specifier_parse(&ss, *arg == ':' ? arg + 1 : arg, 1, NULL);
        if (ret < 0)
            goto end;

        arg = ss.remainder ? ss.remainder : "";
        ret = view_specifier_parse(&arg, &vs);
        if (ret < 0 || (*arg && strcmp(arg, "]")))
            goto end;

        m->file_index  = file_idx;
        m->stream_index = ss.idx;
        m->group_index = ss.stream_list == STREAM_LIST_GROUP_IDX ? ss.list_id : -1;
    } else {
        ViewSpecifier vs;
        char *endptr;

        file_idx = strtol(arg, &endptr, 0);