void avformat_close_input(AVFormatContext **ps)
{
    AVFormatContext *s = *ps;
    AVIOContext *pb    = s->pb;
    if ((s->iformat && s->iformat->flags & AVFMT_NOFILE) ||
        (s->flags & AVFMT_FLAG_CUSTOM_IO))
        pb = NULL;
    flush_packet_queue(s);
    if (s->iformat)
        if (s->iformat->read_close)
            s->iformat->read_close(s);
    avformat_free_context(s);
    *ps = NULL;
    avio_close(pb);
}
['void avformat_close_input(AVFormatContext **ps)\n{\n    AVFormatContext *s = *ps;\n    AVIOContext *pb    = s->pb;\n    if ((s->iformat && s->iformat->flags & AVFMT_NOFILE) ||\n        (s->flags & AVFMT_FLAG_CUSTOM_IO))\n        pb = NULL;\n    flush_packet_queue(s);\n    if (s->iformat)\n        if (s->iformat->read_close)\n            s->iformat->read_close(s);\n    avformat_free_context(s);\n    *ps = NULL;\n    avio_close(pb);\n}', 'static void flush_packet_queue(AVFormatContext *s)\n{\n    free_packet_buffer(&s->internal->parse_queue,       &s->internal->parse_queue_end);\n    free_packet_buffer(&s->internal->packet_buffer,     &s->internal->packet_buffer_end);\n    free_packet_buffer(&s->internal->raw_packet_buffer, &s->internal->raw_packet_buffer_end);\n    s->internal->raw_packet_buffer_remaining_size = RAW_PACKET_BUFFER_SIZE;\n}', 'int avio_close(AVIOContext *s)\n{\n    URLContext *h;\n    if (!s)\n        return 0;\n    avio_flush(s);\n    h = s->opaque;\n    av_freep(&s->buffer);\n    av_free(s);\n    return ffurl_close(h);\n}', 'void avio_flush(AVIOContext *s)\n{\n    flush_buffer(s);\n    s->must_flush = 0;\n}', 'static void flush_buffer(AVIOContext *s)\n{\n    if (s->buf_ptr > s->buffer) {\n        if (s->write_packet && !s->error) {\n            int ret = s->write_packet(s->opaque, s->buffer,\n                                      s->buf_ptr - s->buffer);\n            if (ret < 0) {\n                s->error = ret;\n            }\n        }\n        if (s->update_checksum) {\n            s->checksum     = s->update_checksum(s->checksum, s->checksum_ptr,\n                                                 s->buf_ptr - s->checksum_ptr);\n            s->checksum_ptr = s->buffer;\n        }\n        s->pos += s->buf_ptr - s->buffer;\n    }\n    s->buf_ptr = s->buffer;\n}']