Function build_subtitle_blocks

src/framework/text/subtitle.cpp:104–149

}  // namespace

std::vector<SubtitleBlock> build_subtitle_blocks(
    const std::vector<runtime::WordTimestamp> & words,
    const SubtitleFormatOptions & options) {
    validate_options(options);
    if (words.empty()) {
        return {};
    }

    const int64_t max_block_samples = seconds_to_samples(options.max_block_seconds, options.sample_rate);
    const int64_t max_gap_samples = seconds_to_samples(options.max_gap_seconds, options.sample_rate);
    std::vector<SubtitleBlock> blocks;
    size_t block_begin = 0;
    int64_t previous_start = 0;

    for (size_t i = 0; i < words.size(); ++i) {
        validate_word(words[i], previous_start);
        previous_start = words[i].span.start_sample;

        if (i == block_begin) {
            continue;
        }

        const bool gap_break = words[i].span.start_sample - words[i - 1].span.end_sample > max_gap_samples;
        const bool duration_break = words[i].span.end_sample - words[block_begin].span.start_sample > max_block_samples;
        const bool text_break = would_exceed_text_limit(words, block_begin, i + 1, options);
        if (!gap_break && !duration_break && !text_break) {
            continue;
        }

        SubtitleBlock block;
        block.index = static_cast<int>(blocks.size()) + 1;
        block.span.start_sample = words[block_begin].span.start_sample;
        block.span.end_sample = words[i - 1].span.end_sample;
        block.lines = wrap_words(words, block_begin, i, options.max_chars_per_line);
        blocks.push_back(std::move(block));
        block_begin = i;
    }

    SubtitleBlock block;
    block.index = static_cast<int>(blocks.size()) + 1;
    block.span.start_sample = words[block_begin].span.start_sample;
    block.span.end_sample = words.back().span.end_sample;
    block.lines = wrap_words(words, block_begin, words.size(), options.max_chars_per_line);
    blocks.push_back(std::move(block));
    return blocks;
}

std::string format_srt(
    const std::vector<runtime::WordTimestamp> & words,