static int write_manifest(AVFormatContext *s, int final)
{
    SmoothStreamingContext *c = s->priv_data;
    AVIOContext *out;
    char filename[1024], temp_filename[1024];
    int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;
    int64_t duration = 0;

    snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);
    snprintf(temp_filename, sizeof(temp_filename), "%s/Manifest.tmp", s->filename);
    ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL);
    if (ret < 0) {
        av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
        return ret;
    }
    avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
    for (i = 0; i < s->nb_streams; i++) {
        OutputStream *os = &c->streams[i];
        if (os->nb_fragments > 0) {
            Fragment *last = os->fragments[os->nb_fragments - 1];
            duration = last->start_time + last->duration;
        }
        if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
            video_chunks = os->nb_fragments;
            video_streams++;
        } else {
            audio_chunks = os->nb_fragments;
            audio_streams++;
        }
    }
    if (!final) {
        duration = 0;
        video_chunks = audio_chunks = 0;
    }
    if (c->window_size) {
        video_chunks = FFMIN(video_chunks, c->window_size);
        audio_chunks = FFMIN(audio_chunks, c->window_size);
    }
    avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);
    if (!final)
        avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);
    avio_printf(out, ">\n");
    if (c->has_video) {
        int last = -1, index = 0;
        avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);
        for (i = 0; i < s->nb_streams; i++) {
            OutputStream *os = &c->streams[i];
            if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_VIDEO)
                continue;
            last = i;
            avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%d\" FourCC=\"%s\" MaxWidth=\"%d\" MaxHeight=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codec->bit_rate, os->fourcc, s->streams[i]->codec->width, s->streams[i]->codec->height, os->private_str);
            index++;
        }
        output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
        avio_printf(out, "</StreamIndex>\n");
    }
    if (c->has_audio) {
        int last = -1, index = 0;
        avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);
        for (i = 0; i < s->nb_streams; i++) {
            OutputStream *os = &c->streams[i];
            if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
                continue;
            last = i;
            avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%d\" FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" BitsPerSample=\"16\" PacketSize=\"%d\" AudioTag=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codec->bit_rate, os->fourcc, s->streams[i]->codec->sample_rate, s->streams[i]->codec->channels, os->packet_size, os->audio_tag, os->private_str);
            index++;
        }
        output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
        avio_printf(out, "</StreamIndex>\n");
    }
    avio_printf(out, "</SmoothStreamingMedia>\n");
    avio_flush(out);
    ff_format_io_close(s, &out);
    return ff_rename(temp_filename, filename);
}