test.php

<?php

// streamlink 'https://www.youtube.com/watch?v=oIgbl7t0S_w' 240p -O | ffmpeg -i /dev/stdin -vn -acodec pcm_s16le -ar 16000 -ac 2 -f segment -segment_time 5 -reset_timestamps 1 -strftime 1 output_%s.wav
date_default_timezone_set('Asia/Taipei');
$chunk_size = 5;
//$model = 'large';
$model = 'medium';
$message_pool = '';
$remain = $chunk_size;
while (true) {
    $files = glob("output_*.wav");
    sort($files);
    array_pop($files);

    if (!count($files)) {
        sleep(1);
        continue;
    }

    preg_match('#output_(\d+)#', $files[0], $matches);
    $t = $matches[1];

    $fp = fopen('list.txt', 'w');
    foreach ($files as $f) {
        fputs($fp, sprintf("file '%s'\n", $f));
    }
    fclose($fp);

    $combined_file = "combined_{$t}.wav";
    if (file_exists($combined_file)) {
        unlink($combined_file);
    }

    $cmd = sprintf('ffmpeg -f concat -i list.txt -acodec copy %s', $combined_file);
    error_log($cmd);
    system($cmd);

    $cmd = sprintf("ffprobe -i %s -show_entries format=duration", escapeshellarg($combined_file));
    $ret = `$cmd`;
    preg_match('#duration=(.*)#', $ret, $matches);
    $duration = trim($matches[1]);
    $offset = $chunk_size - $remain;

    echo json_encode([
        't' => $t,
        't_s' => date('YmdHis', $t),
        'files' => implode(',', $files),
        'duration' => $duration,
        'remain' => 0,
        'offset' => $offset,
    ]) . "\n";

    if ($duration > 40) {
        $model = 'small';
    } else {
        $model = 'medium';
    }
    $cmd = sprintf("./whisper.cpp/main --prompt %s -m ./whisper.cpp/models/ggml-{$model}.bin -l zh --offset-t %d %s",
        escapeshellarg("前面的內容：" . $message_pool), 
        $offset * 1000,
        escapeshellarg($combined_file)
    );
    error_log($cmd);
    $fp = popen($cmd, 'r');
    $prev_message = null;
    while ($line = fgets($fp)) {
        if (!trim($line)) {
            continue;
        }
        # 00:00:02.400
        preg_match('#\[(.*) --> (.*)]  (.*)#', trim($line), $matches);
        list(, $s, $e, $message) = $matches;
        $offset = array_map('floatval', explode(':', $s));
        $offset = $offset[0] * 3600 + $offset[1] * 60 + $offset[2];
        $m = ['offset' => $offset, 'message' => $message];
        if (!is_null($prev_message)) {
            $message_pool .= $prev_message['message'];
            if (mb_strlen($message_pool) > 100) {
                $message_pool = mb_substr($message_pool, mb_strlen($message_pool) - 100);
            }
            echo json_encode([
                'time' => date('Y-m-d H:i:s', floor($t + $prev_message['offset'])),
                'message' => $prev_message['message'],
                'offset' => $offset,
                'model ' => $model,
            ], JSON_UNESCAPED_UNICODE) . "\n";
        }
        $prev_message = $m;
    }
    pclose($fp);

    if (is_null($prev_message)) {
        foreach ($files as $f) {
            unlink($f);
        }
    } else {
        array_pop($files);
        foreach ($files as $f) {
            unlink($f);
        }
        $remain = $duration - $prev_message['offset'];
        echo json_encode([
            'combined_file' => $combined_file,
            'prev_message' => $prev_message,
            'duration' => $duration,
        ] ,JSON_UNESCAPED_UNICODE) . "\n";
    }
}